Mechanochemistry: A new frontier in chemical synthesis

Abstract

Mechanochemistry, a branch of chemistry that involves the application of mechanical energy to induce chemical reactions, has garnered significant attention for its unique approach to chemical synthesis and materials processing. This review explores the fundamental principles of mechanochemistry, including the impact of mechanical forces on crystalline structures and the resultant chemical transformations. Recent advancements highlight the field’s potential in reducing reliance on hazardous solvents, improving energy efficiency, and supporting sustainable practices. Mechanochemistry’s applications extend to recycling and resource recovery, particularly in the context of valuable metals and materials, aligning with the principles of green chemistry and the circular economy. Despite its benefits, the field faces challenges related to scalability, process control, and material limitations. Future directions include integrating advanced technologies, exploring new applications, and enhancing fundamental understanding to address these challenges. Mechanochemistry stands as a transformative and evolving area of research with significant implications for scientific progress and industrial applications, promising to drive innovation and sustainability in various sectors.

Keywords

ball milling grinding mechanical force scalability solid state

Introduction

Background

Mechanochemistry, the discipline at the intersection of chemistry and mechanics, involves the initiation and manipulation of chemical reactions through mechanical force.¹ This method, which includes grinding, milling, or shearing, contrasts sharply with traditional chemistry that relies on heat, light, or solvents to drive reactions.² The resurgence of mechanochemistry in recent years is attributed to its potential for sustainable and environmentally benign chemical processes. Mechanochemistry is not only relevant for fundamental research but also holds significant promise for industrial applications, especially in the synthesis of pharmaceuticals, materials science, and environmental remediation.³ Mechanochemical processes typically occur in solid-state environments, which eliminates the need for solvents and thus reduces waste and environmental impact. The mechanical energy applied to the reactants can induce changes at the molecular level, breaking and forming bonds, and leading to unique products that might be difficult or impossible to obtain via conventional methods.⁴ This aspect of mechanochemistry aligns well with the principles of green chemistry, which advocate for reduced use of hazardous substances and the development of energy-efficient processes.⁵

The roots of mechanochemistry extend back to ancient times, with the first use of grinding stones for the preparation of pigments, medicines, and other materials.⁶ However, it was not until the early 19th century that mechanochemistry began to be recognized as a distinct scientific field. Michael Faraday is often credited with some of the earliest formal observations in mechanochemistry. In 1820, Faraday described the mechanical reduction of silver chloride to metallic silver, marking one of the first documented instances of a mechanochemical reaction. In the late 19th and early 20th centuries, Wilhelm Ostwald, a prominent chemist and Nobel laureate, made significant contributions to the theoretical foundation of mechanochemistry.⁷ Ostwald’s work on the energetics of mechanical processes laid the groundwork for understanding how mechanical energy could influence chemical reactions.⁸ Concurrently, Peter P. E. Meixner and others began to develop mechanistic theories to describe these processes, although the complexity of mechanochemical reactions often eluded full theoretical description. The field saw a period of relative dormancy until the latter half of the 20th century, when advancements in technology and a growing interest in sustainable practices reignited scientific inquiry into mechanochemical processes.⁹ High-energy ball milling, introduced in the 1970s and 1980s, provided a powerful tool for conducting mechanochemical reactions with greater control and efficiency. This technique involves placing reactants in a rotating container with milling media, such as balls, which exert high-impact forces on the reactants, facilitating chemical transformations.¹⁰

With the advent of sophisticated analytical tools and high-energy milling techniques, the scope of mechanochemistry has broadened considerably. Researchers have developed a deeper understanding of the fundamental mechanisms at play, including the role of defects,¹¹ amorphization,¹² and phase transitions in facilitating reactions.¹³ This period also saw the emergence of solvent-free mechanochemical syntheses, which further underscored the environmental benefits of the approach.¹⁴ Recent decades have witnessed significant advancements in the application of mechanochemistry across various fields. In materials science, mechanochemistry has been instrumental in the synthesis of nanomaterials,¹⁵ metal–organic frameworks (MOFs),¹⁶ and complex alloys.¹⁷ These materials often exhibit enhanced properties, such as increased surface area, improved catalytic activity, or unique electronic characteristics, which are attributed to the mechanical forces applied during synthesis.¹⁸ In organic chemistry, mechanochemical methods have enabled the development of novel synthetic pathways and the efficient production of complex molecules.¹⁹ For instance, the use of mechanochemical techniques to facilitate C–C bond formation,²⁰ cross-coupling reactions,²¹ and the synthesis of heterocycles²² has opened new avenues for drug discovery and development.²³ Mechanochemistry has also been employed to activate otherwise inert molecules, allowing for reactions that are difficult to achieve through conventional means.²⁴ Mech-anochemistry offers a unique and powerful approach to chemical synthesis that can complement or even replace traditional methods in certain cases.²⁵ By using mechanical force to drive chemical reactions, mechanochemistry can reduce the need for solvents and harsh reaction conditions, leading to more sustainable and environmentally friendly processes.²⁶ In addition, mechanochemical methods can enable the discovery of new reaction pathways and the synthesis of novel materials with unique properties.²⁷ The interdisciplinary nature of mechanochemistry, which intersects with fields such as materials science,²⁸ physics,²⁹ and engineering,³⁰ provides opportunities for collaboration and innovation. As researchers continue to develop new mechanochemical techniques and applications, the field is poised to make significant contributions to both fundamental science and practical applications.³¹

This review will explore the fundamental principles of mechanochemistry, including the types of mechanical forces involved and their impact on chemical reactions. We will examine recent advancements in mechanochemical techniques and instrumentation, such as high-energy ball milling, planetary mills, and mechanochemical reactors. The applications section will focus on the use of mechanochemistry in various fields, particularly organic synthesis, materials science, and pharmaceuticals. This review also focuses on the environmental and sustainability benefits of mechanochemistry, highlighting its potential to reduce solvent use, energy consumption, and waste production. Finally, we will address current challenges in the field, such as the need for a better mechanistic understanding and the scalability of mechanochemical processes.

Fundamental principles of mechanochemistry

At the start of the 20th century, W. Nernst categorized various branches of chemistry based on the type of energy used in the system, such as thermochemistry, electrochemistry, and photochemistry. Mechanochemistry emerged as a field focusing on reactions driven by mechanical energy. A more specialized area, known as tribochemistry, was designated for reactions induced by friction during the milling of solid reagents.^32
–34

Mechanical grinding of solids involves several processes, including:

Particle Comminution: Reducing particle size to a very fine level.

Surface Generation: Creating extensive new surfaces.

Formation of Defects: Introducing dislocations and point defects into the crystalline structure.

Phase Transformations: Inducing changes in polymorphic materials.

Chemical Reactions: Facilitating processes such as decomposition, ionic exchange, oxidation-reduction, and the formation of complexes and adducts.

Initially, these reactions were thought to be driven by heat generated during milling, due to the large contact area between the solids.^32,33 However, Carey-Lea’s observations at the end of the 20th century revealed that mechanochemical processes differ fundamentally from thermal processes.³² For instance, heating silver chloride (AgCl) and mercury chloride (HgCl₂) leads to their melting and sublimation, whereas milling these compounds results in their decomposition into chlorine gas (Cl₂) and metal. The critical role of mechanical defects, as high-energy structures influencing chemical transformations, was recognized later.³⁴ Grinding two solid substances initiates a complex sequence of transformations where mechanical energy disrupts the crystalline order, causing the formation of cracks and new surfaces. During the collision of particles, the solids can deform or even melt, generating localized hot spots. These hot spots result in high-vibrational excitation of the molecules, leading to bond breaking. These stochastic events occur over a timescale of approximately 10⁻¹⁷ s, during which thermal equilibrium is not present.³² This period, known as the plasma phase, is succeeded by the post-plasma phase, lasting around 10⁻¹⁶ s or more, where energy dissipation processes bring the system closer to a Maxwell–Boltzmann distribution.³³ The reactions occurring during this post-plasma phase contribute to the formation of many of the resulting products. In addition, the energy stored in the defects of the crystalline structure can drive slower chemical processes. As such, mechanochemical reactions often involve intricate mechanisms and can be quite complex.³⁴ Milling techniques vary widely. The simplest method is the laboratory mortar and pestle, which can induce numerous mechanochemical reactions without requiring substantial energy input. For higher energy requirements and extended milling times, ball mills are employed, which can operate for hours or even days. Laboratory vibrators, such as the Wiggle-Bug type, are effective for milling small samples efficiently. For prolonged and high-energy milling, high-speed attritors or stainless steel ball mills, such as those of the Spex type, are utilized. These are particularly suitable for mechanical alloying or the amorphization of hard crystalline solids.^35,36 Ultrasonic methods can also be applied in mechanochemical processes.³⁷ Thus, mechanochemistry is a distinctive area of chemistry that harnesses mechanical energy to drive chemical reactions. Unlike traditional chemical processes that rely on thermal, photochemical, or catalytic energy, mechanochemistry employs mechanical forces such as grinding, milling, and shearing to induce and accelerate chemical transformations. This section delves into the fundamental principles of mechanochemistry, exploring the types of mechanical forces involved, the nature of mechanochemical reactions, and the key mechanistic insights that underpin these processes.³⁸

Mechanical forces in mechanochemistry

Mechanochemical reactions are driven by different mechanical forces, which play a pivotal role in initiating and sustaining chemical transformations. These forces act on the reactants, inducing physical and chemical changes that are key to mechanochemical processes. Understanding the nature of these forces is essential for optimizing reactions and expanding the application of mechanochemistry.

Shear force occurs when mechanical action is applied parallel to the surface of a material, leading to deformation and disruption of chemical bonds.³⁹ In mechanochemistry, shear forces are typically generated during processes such as milling or grinding. For instance, in high-energy ball milling, the balls within a milling jar exert shear forces on the powder, leading to the breakdown of particle agglomerates and facilitating chemical reactions. This type of force is particularly useful for initiating reactions in solid-state chemistry, where traditional solvents are not used. A notable example is the solvent-free synthesis of MOFs, where zinc acetate and 2-aminoterephthalic acid react under shear stress to form a crystalline Zn-based MOF without the need for a solvent⁴⁰

Example reaction:

Zn {(OAc)}_{2} {+ H}_{2} N-BDC \to Zn-MOF (\begin{array}{l} ball milling, \\ solvent-free \\ conditions \end{array})

Compression force involves the application of pressure that compacts particles, forcing them into close proximity and enhancing their reactivity.⁴¹ Compression plays a key role in mechanochemical reactions where the reactants undergo phase transitions or structural rearrangements. An example of this is the formation of perovskite oxides, where lanthanum oxide and titanium dioxide are compressed during milling to form a perovskite structure, a reaction that can proceed without requiring high temperatures typically needed in conventional synthesis⁴²

Example reaction:

{La}_{2} O_{3} {+ TiO}_{2} \to {LaTiO}_{3} (\begin{array}{l} under high - \\ pressure ball milling \end{array})

Impact forces are generated by collisions between particles or between particles and milling media, creating high-energy impacts that cause bond cleavage and the formation of new bonds.⁴³ These forces are most evident in planetary ball milling, where repeated high-energy impacts drive alloying reactions. For instance, the mechanochemical synthesis of Ni-Ti alloys relies on impact forces to induce atomic diffusion between nickel and titanium, forming the desired alloy⁴⁴

Example reaction:

Ni + Ti \to NiTi alloy (\begin{array}{l} via high-energy \\ planetary ball milling \end{array})

The combination of these forces—shear, compression, and impact—influences the efficiency, selectivity, and overall outcome of mechanochemical reactions. By tailoring the conditions to control these forces, researchers can optimize mechanochemical processes to create advanced materials, synthesize novel compounds, and enhance reaction efficiency in a solvent-free environment⁴⁵

Energy transfer and mechanochemical activation

In mechanochemistry, the energy required to drive chemical transformations is transferred through mechanical means, such as grinding, milling, or compression. This energy transfer results in mechanochemical activation, which can occur through various mechanisms, including frictional heating, localized pressure, and deformation of reactants.

Frictional heating is a primary method of energy transfer, where the kinetic energy from milling or grinding generates heat through friction. Although mechanochemistry is often touted as a low-temperature alternative to conventional reactions, local heating can still play a critical role in activating reactants. An example of this is the mechanochemical synthesis of calcium titanate (CaTiO₃) from calcium oxide (CaO) and titanium dioxide (TiO₂), where frictional heating facilitates the solid-state reaction.^24,40

Example reaction:

{CaO + TiO}_{2} \to {CaTiO}_{3} (\begin{array}{l} via ball milling \\ with frictional heating \end{array})

Localized pressure created by high-energy impacts and compressive forces also contributes significantly to mechanochemical activation. These pressures are sufficient to alter the structure of reactants, induce phase transitions, or even trigger the formation of new chemical bonds. In the case of ZnS nanocrystals, the pressure-induced transformation of zinc oxide (ZnO) and sulfur during high-energy milling leads to the direct formation of nanocrystalline zinc sulfide, a process driven by the localized pressures applied during milling.^25,41

Example reaction:

ZnO + S \to ZnS nanocrystals (\begin{array}{l} under high-energy \\ ball milling with \\ localized pressure \end{array})

Deformation of reactants under mechanical stress can activate chemical bonds and lower the activation energy required for reactions. Deformation occurs when the mechanical forces applied during milling cause structural distortions or defects in reactants, making them more reactive. An example of this is the mechanochemical formation of covalent organic frameworks (COFs), where aromatic compounds such as 1,3,5-benzenetricarbonyl trichloride and p-phenylenediamine undergo deformation and bond rearrangements to form the framework without the need for solvents^26,42

Example reaction:

\begin{matrix} C_{9} H_{3} {Cl}_{3} O_{3} + C_{6} H_{8} N_{2} \to Covalent Organic \\ Framework (\begin{array}{l} via ball \\ milling under \\ mechanical stress \end{array}) \end{matrix}

The efficiency of mechanochemical activation depends on how effectively energy is transferred and utilized. By optimizing the types of forces and adjusting process parameters such as milling speed, time, and media, researchers can enhance the energy transfer and improve the outcomes of mechanochemical reactions. Understanding these energy transfer mechanisms enables greater control over the activation process, expanding the utility of mech-anochemistry for synthesizing advanced materials and chemicals^27,43

Mechanochemical reactions

Mechanochemical reactions leverage mechanical energy to induce chemical transformations, distinguishing themselves from traditional thermal or solution-based reactions. These processes can lead to enhanced reaction rates, reduced energy consumption, and the possibility of operating without solvents, making them environmentally friendly alternatives. Understanding the unique aspects of mechanochemical reactions is crucial for advancing their applications in various fields, including materials science and pharmaceuticals Table 1.

Table 1.

Comparative data of mechanochemical reactions with other reaction types.

Aspect	Mechanochemical reaction	Thermal-based reaction	Solution-based reaction	References
Energy source	Mechanical energy (e.g. milling, grinding)	Heat energy	Solvent interactions and heat energy	10,43
Reaction medium	Solid state (often dry)	Typically gaseous or liquid	Liquid state	11,25
Reaction rate	Often faster due to localized energy input	Generally slower, dependent on temperature	Variable can be fast but dependent on concentration	12,41
Environment	Solvent-free, reducing hazardous waste	Often requires solvents, which may be hazardous	Solvent use can lead to environmental concerns	13,39
Product purity	Often higher due to minimal contamination	Can be affected by solvents and side reactions	Solvent impurities can impact product purity	14,34
Scalability	Challenging; requires optimization for industrial scale	Generally easier to scale with established methods	Established scaling techniques are widely known	15,42
Examples	Synthesis of nanomaterials via ball milling	Thermal decomposition of salts	Grignard reaction in organic synthesis	16,17

The comparative analysis highlights several advantages of mechanochemical reactions over traditional methods. Mechanochemistry often allows for faster reaction rates due to localized energy application and can produce purer products without solvent interference. However, challenges remain in scaling these processes for industrial applications. In contrast, while thermal reactions and solution-based reactions have established protocols and scalability, they often involve hazardous solvents and slower reaction rates. The insights gained from this comparison indicate that mechanochemistry holds promise for sustainable practices in chemical synthesis, but further research is needed to address scalability and optimize conditions for various applications.

Types of mechanochemical reaction

Mechanochemical reactions occur when mechanical forces induce or accelerate chemical transformations. These reactions can be categorized based on their mechanisms and the types of processes involved:

Solid-State Reactions: Mechanochemical methods are often used for solid-state reactions, where reactants are in the solid phase and react without solvents. Mechanical forces facilitate these reactions by increasing surface area, inducing phase changes, and breaking chemical bonds.⁴⁶ The synthesis of lithium-ion battery materials, such as lithium iron phosphate (LiFePO4), can be achieved through solid-state mechanochemical methods. Milling the reactants leads to the formation of the desired material with enhanced electrochemical properties.⁴⁷

Phase Transition Reactions: Mechanical forces can induce phase transitions in materials, which can subsequently lead to chemical reactions. This is due to the changes in physical properties and reactivity that occur during phase transitions.⁴⁸ The mechanochemical activation of metal oxides can lead to phase transitions that promote further reactions. For instance, grinding copper oxide (CuO) can induce a phase transition that facilitates the reduction of CuO to metallic copper.⁴⁹

Polymerization and Cross-Linking: Mechanochemical processes can initiate polymerization and cross-linking reactions. Mechanical energy can activate monomers and cause them to polymerize or cross-link, producing polymers and networks with unique properties.^50,51 The mechanochemical polymerization of cyclic olefins can be performed by subjecting monomers to mechanical forces in a ball mill. This process yields high-performance polymers with enhanced mechanical and thermal properties.⁵²

Decomposition Reactions: Mechanochemical processes can also induce decomposition reactions, where a compound breaks down into simpler substances. The mechanical energy applied can disrupt chemical bonds and lead to the formation of new products.⁵³ The mechanochemical decomposition of potassium perchlorate (KClO₄) under grinding conditions can produce potassium chloride (KCl) and oxygen gas (O₂). This reaction is facilitated by the mechanical energy that breaks the chemical bonds in KClO₄.⁵⁴

Mechanistic insights

Understanding the mechanistic aspects of mechanochemical reactions is essential for optimizing and controlling these processes. The key mechanistic insights include:

Energy Transfer: Mechanochemical reactions rely on the transfer of mechanical energy to the reactants. This energy can cause localized heating, pressure, and shear forces that facilitate chemical reactions.⁵⁵ The efficiency of energy transfer is influenced by factors such as the type of mechanical equipment used, the nature of the reactants, and the operating conditions.⁵⁶

Molecular-Level Interactions: Mechanochemical processes involve interactions at the molecular level. Mechanical forces can alter the structure and reactivity of molecules, leading to changes in reaction rates, product distribution, and reaction pathways. Understanding these molecular interactions is crucial for predicting and controlling mechanochemical reactions.^57,58

Defects and Amorphization: Mechanical forces can introduce defects and amorphous regions in materials, which can influence their reactivity. The formation of defects during milling can increase the surface area and reactivity of powders, enhancing their ability to participate in chemical reactions.^59,60 The milling of graphite can lead to the formation of defects and amorphous carbon, which can enhance the material’s reactivity and facilitate the synthesis of graphene and other carbon-based materials.⁶¹

Reactive Intermediates: Mechanochemical reactions often involve the formation of reactive intermediates that are not typically observed in solution-based reactions. These intermediates can lead to unique reaction pathways and products.^62,63 In the mechanochemical synthesis of high-energy materials, such as explosives, reactive intermediates can play a crucial role in the formation of the final product. The mechanical energy applied during synthesis can generate intermediates that are highly reactive and lead to the desired product.⁶⁴

Recent advancements in mechanochemistry

Mechanochemistry has witnessed significant advancements in recent years, driven by innovations in technology and a deeper understanding of the fundamental processes involved. These advancements have expanded the scope of mechanochemical applications and enhanced its effectiveness in various fields.⁶⁵ This section explores recent developments in mechanochemistry, focusing on novel techniques, improved methodologies, and emerging applications.

Advanced milling techniques

High-Energy Ball Mills: Recent improvements in high-energy ball mills have enhanced their efficiency and precision. Modern high-energy mills, such as planetary mills and attritors, are designed to achieve higher impact forces and more uniform energy distribution. These advancements allow for more effective particle size reduction and better control over reaction conditions.⁶⁶ The development of planetary ball mills with improved milling jars and balls has led to finer particle sizes and higher reaction yields. These mills are now commonly used in the synthesis of nanomaterials and advanced alloys.⁶⁷

Ultrasonic Milling: Ultrasonic milling has emerged as a powerful technique for mechanochemical reactions. By applying high-frequency ultrasonic waves to the milling process, it is possible to achieve intense local heating and cavitation effects, which enhance reaction rates and improve product formation.⁶⁸ Ultrasonic milling has been used to enhance the synthesis of metal nanoparticles and improve the dispersion of catalysts in various reactions.⁶⁹

Cryogenic Milling: Cryogenic milling involves grinding materials at extremely low temperatures using liquid nitrogen or other cryogens. This technique helps maintain the stability of temperature-sensitive compounds and enables the processing of materials that are difficult to mill at ambient temperatures.^70,71 Cryogenic milling has been applied in the production of polymers and pharmaceuticals that require precise control over temperature to prevent degradation or unwanted reactions.⁷²

Mechanochemical synthesis and applications

Nanomaterials and Nanocomposites: Mechano-chemistry has been increasingly used for the synthesis of nanomaterials and nanocomposites. The high-energy impacts and shear forces involved in mechanochemical processes facilitate the production of nanoparticles with controlled sizes and shapes.^73,74 Mechanochemical methods have been employed to produce carbon nanotubes, graphene oxide, and metal nanoparticles, which find applications in electronics, energy storage, and catalysis.⁷⁵

Green Chemistry and Sustainable Processes: Recent advancements in mechanochemistry align with the principles of green chemistry by minimizing the use of solvents and reducing energy consumption. Mechanochemical processes often operate under mild conditions and generate fewer by-products, making them more environmentally friendly.^76,77 Mechanochemical synthesis of pharmaceuticals and fine chemicals can be performed without organic solvents, reducing the environmental impact and improving sustainability.⁷⁸

Mechanochemical Activation of Reactions: Mechanochemical activation has been shown to enhance the reactivity of materials and facilitate reactions that are challenging under conventional conditions. This includes the activation of polymerization reactions, oxidation processes, and complex formation.^79,80 Mechanochemical activation has been used to initiate polymerizations of monomers that are typically difficult to polymerize in solution, leading to the formation of high-performance polymers.⁸¹

Novel mechanochemical techniques

High-Pressure Mechanochemistry: High-pressure mechanochemistry involves conducting mechanochemical reactions under elevated pressures. This technique can lead to different reaction pathways and improved yields compared to conventional milling methods.⁸² High-pressure milling has been used to synthesize new materials and alloys with unique properties by altering the reaction conditions and energy distribution.⁸³

Mechanochemical Co-Synthesis: Mechanochemical co-synthesis refers to the simultaneous synthesis of multiple components or phases within a single mechanochemical process. This approach allows for the creation of complex materials with tailored properties.⁸⁴ Mechanochemical co-synthesis has been applied to produce mixed-metal oxides and composite materials with specific catalytic or electronic properties.⁸⁵

In-Situ Monitoring and Control: Advances in in-situ monitoring techniques, such as real-time spectroscopy and microscopy, have enabled better control and understanding of mechanochemical processes. These techniques provide insights into reaction dynamics, product formation, and intermediate species.^86,87 In-situ Raman spectroscopy has been used to monitor the progress of mechanochemical reactions and identify reaction intermediates in real-time.⁸⁸

Future directions

Integration with Other Techniques: The integration of mechanochemistry with other techniques, such as electrochemistry and photochemistry, holds pro-mise for developing new reaction pathways and appli-cations. Hybrid approaches may offer enhanced control and novel functionalities.⁸⁹ Combining mechanochemistry with electrochemical methods could lead to new approaches for energy storage and conversion.⁹⁰

Exploration of New Materials and Reactions: Ongoing research is focused on exploring new materials and reactions that can benefit from mechanochemical processing. This includes investigating novel catalysts, polymers, and advanced materials with specific properties.⁹¹ Research into mechanochemical synthesis of advanced ceramics and biomaterials is expanding the range of applications and improving material performance.⁹²

Scalability and Industrial Applications: Scaling up mechanochemical processes for industrial applications remains a key challenge. Future research will focus on optimizing processes for large-scale production and addressing challenges related to equipment design and process efficiency.⁹³ Developing industrial-scale mechanochemical reactors and optimizing processing conditions for large quantities of materials will enhance the commercial viability of mechanochemical methods.⁹⁴

Applications of mechanochemistry

Mechanochemistry, the study of chemical transformations induced by mechanical force, has broad and impactful applications across various scientific and industrial fields. Its ability to induce chemical reactions through mechanical means makes it a valuable tool in areas ranging from materials science to pharmaceuticals and environmental technology.⁹⁵ This section explores some of the key applications of mechanochemistry, highlighting its versatility and significance in contemporary research and industry.

Materials science

Nanomaterials Synthesis: Mechanochemistry plays a crucial role in the synthesis of nanomaterials, including nanoparticles, nanotubes, and nanocomposites. High-energy milling processes create nanoscale particles with controlled sizes and shapes. These nanomaterials often exhibit unique physical and chemical properties, such as enhanced catalytic activity, improved mechanical strength, and increased surface area.⁹⁶ Mechanochemical synthesis of graphene oxide and carbon nanotubes has been extensively studied for applications in electronics, energy storage, and composite materials. These materials offer superior electrical conductivity and mechanical properties compared to their bulk counterparts.⁹⁷

Ceramic and Composite Materials: Mechano-chemistry is used to produce advanced ceramics and composite materials with tailored properties. The process enables the formation of complex phases and the incorporation of various additives into ceramic matrices, leading to materials with enhanced thermal, electrical, and mechanical properties.⁹⁸ Mechanochemical processing of metal–ceramic composites, such as silicon carbide and aluminum oxide, is used to create materials with high hardness and thermal resistance, suitable for applications in aerospace and defense industries.⁹⁹

Amorphous and Metastable Phases: The ability of mechanochemistry to induce phase transformations allows for the creation of amorphous or metastable phases that are not easily obtainable through traditional methods. These phases often exhibit unique properties and can be used in various high-tech applications.¹⁰⁰ Mechanochemical processing has been employed to produce amorphous alloys and metallic glasses, which offer advantages such as high strength and resistance to wear and corrosion.¹⁰¹

Pharmaceutical industry

Drug Synthesis and Formulation: Mechano-chemistry is increasingly used in the pharmaceutical industry for drug synthesis and formulation. The technique facilitates the development of new drug compounds, the optimization of reaction conditions, and the improvement of drug delivery systems.¹⁰² Mechanochemical synthesis of pharmaceutical intermediates and active pharmaceutical ingredients (APIs) can enhance reaction yields and reduce the need for solvents, aligning with green chemistry principles. Mechanochemical techniques are also used in the formation of drug-polymer complexes and nanosuspensions to improve drug solubility and bioavailability.¹⁰³

Pharmaceutical Nanocarriers: Mechanochemistry is employed to create nanocarriers for drug delivery, such as nanoparticles and nanocapsules. These carriers can enhance the stability, release rate, and targeted delivery of therapeutic agents.¹⁰⁴ Mechanochemical methods are used to prepare lipid-based nanoparticles and polymeric nanocarriers for controlled drug release, improving the efficacy and safety of pharmaceutical treatments.¹⁰⁵

Environmental technology

Waste Treatment and Recycling: Mechanochemistry offers innovative approaches to waste treatment and recycling. By applying mechanical force, waste materials can be processed to recover valuable metals, decompose hazardous substances, and convert waste into reusable materials.¹⁰⁶ Mechanochemical methods are used for the recovery of rare earth elements (REEs) from electronic waste and the treatment of contaminated soils. The process can effectively separate and concentrate valuable components, reducing environmental impact and promoting resource recovery.¹⁰⁷

Pollutant Degradation: Mechanochemistry can be applied to the degradation of environmental pollutants, including organic contaminants and heavy metals. Mechanical energy can activate chemical reactions that break down pollutants or facilitate their transformation into less harmful substances.¹⁰⁸ Mechanochemical activation of photocatalysts has been used to enhance the degradation of organic pollutants in water, providing a more efficient method for wastewater treatment.¹⁰⁹

Energy storage and conversion

Batteries and Supercapacitors: Mechanochemical methods are utilized to improve the performance of energy storage devices, such as batteries and supercapacitors. The technique helps in the synthesis of advanced electrode materials with enhanced electrochemical properties.¹¹⁰ Mechanochemical synthesis of lithium-ion battery electrodes, such as lithium iron phosphate (LiFePO4), results in materials with improved conductivity and cycle stability, contributing to more efficient and durable energy storage systems.¹¹¹

Hydrogen Storage: Mechanochemical processes are employed to develop materials for hydrogen storage, which is essential for clean energy technologies. The ability to synthesize and optimize metal hydrides and other hydrogen storage materials through mechanochemistry enhances their performance and practicality.¹¹² Mechanochemical treatment of metal hydrides, such as magnesium hydride (MgH₂), improves their hydrogen absorption and desorption kinetics, making them suitable for use in hydrogen fuel cells and storage systems.¹¹³

Catalysis

Catalyst Synthesis: Mechanochemistry is used to synthesize and modify catalysts for various chemical reactions. The process enables the creation of catalysts with specific active sites, surface areas, and structural properties.¹¹⁴ Mechanochemical methods are employed to prepare supported metal catalysts, such as palladium on carbon, which are used in hydrogenation and cross-coupling reactions. The technique allows for precise control over catalyst composition and performance.¹¹⁵

Activation and Regeneration: Mechanochemistry can activate or regenerate catalysts that have become deactivated during use. By applying mechanical force, catalysts can be rejuvenated or reactivated for continued use in industrial processes.¹¹⁶ Mechanochemical activation of spent catalysts, such as those used in petrochemical refining, restores their activity and extends their operational lifespan.¹¹⁷

Industrial applications

Mechanochemistry has several notable industrial applications. This method is not only simpler and more economical but also environmentally friendly, as it eliminates the release of harmful chemicals into the environment. In inorganic chemistry, mechanochemistry has been used for the synthesis of alloys, cermets, spinels, semiconductors, superconductors, catalysts, fertilizers, ceramics, and construction materials.¹¹⁸ By milling two metals at room temperature, alloys can be produced. The milling process deforms metallic particles into thin layers, and with continued milling, diffusion results in a homogeneous alloy. This is known as cold alloying¹¹⁹ Milling a soft metal with a hard ceramic material creates composites known as cermets, which have valuable properties. During milling, the hard ceramic particles embed in the metal matrix. Further milling micronizes the hard particles, and the metal coats the fine ceramic units, forming spherical particles that constitute the cermets¹²⁰

Mechanical Activation of Minerals: Milling certain minerals can modify their properties for industrial use:^121,122

Silica, alumina, and alumino-silicates can be activated with small amounts of metals to become valuable catalysts.

Milling bauxite facilitates the extraction of Al(OH)₃ using concentrated NaOH solutions at lower temperatures, producing a purer form of Al(OH)₃ for aluminum production.

Phosphate rock, the primary source of phosphorus in fertilizers, can be amorphized through high mechanical impact, resulting in a material that plant roots can absorb more easily. This new fertilizer, known as tribophos, is cheaper than fertilizers produced by treating the mineral with sulfuric or phosphoric acid.

In the concrete industry, replacing sand and gravel with freshly ground rock in the cement mix results in an extremely hard concrete, known as superconcrete. This concrete has a strongly bonded cement phase to the hard rock and sand phase.

Environmental and sustainability benefits of mechanochemistry

Mechanochemistry, the branch of chemistry focused on chemical reactions driven by mechanical forces, offers numerous environmental and sustainability benefits. Its unique approach to inducing chemical transformations through mechanical energy rather than traditional thermal or chemical methods aligns well with the principles of green chemistry and sustainable development.^123,124 This section explores the environmental and sustainability advantages of mechanochemistry, highlighting its contributions to reducing environmental impact and promoting resource efficiency.

Reduced use of hazardous solvents and reagents

Minimized Solvent Use: Mechanochemical processes often operate in the absence of solvents or with minimal solvent use. Traditional chemical reactions typically require large quantities of organic solvents, which can be hazardous to both human health and the environment. By reducing or eliminating solvent use, mechanochemistry helps minimize environmental contamination and health risks associated with solvent handling and disposal.¹²⁵ In the synthesis of pharmaceuticals and fine chemicals, mechanochemical methods can replace solvent-intensive processes with solid-state reactions, significantly reducing solvent waste and associated environmental impacts.¹²⁶

Green Chemistry Principles: Mechanochemistry aligns with the principles of green chemistry, which emphasize reducing the use of hazardous substances and improving overall process efficiency. The ability to perform reactions without solvents or with benign additives contributes to safer and more sustainable chemical processes.¹²⁷ Mechanochemical synthesis of nanomaterials and catalysts often involves solid-state reactions that do not require hazardous solvents, promoting safer and more environmentally friendly practices.¹²⁸

Energy efficiency and reduced carbon footprint

Lower Energy Consumption: Mechanochemical processes can be more energy-efficient compared to traditional thermal methods. The localized energy generated during mechanical milling or grinding can induce chemical reactions at lower temperatures, reducing the overall energy required for the process. This energy efficiency translates into a lower carbon footprint and reduced greenhouse gas emissions.¹²⁹ Mechanochemical activation of catalysts or reactants often requires less energy than conventional heating methods, leading to reduced energy consumption and lower environmental impact.¹³⁰

Efficient Use of Mechanical Energy: Mechano-chemistry harnesses mechanical energy directly to drive chemical reactions, often achieving high reaction rates and yields with minimal additional energy inputs. This efficient use of mechanical energy contributes to overall process sustainability and resource conservation.¹³¹ High-energy ball milling for the synthesis of advanced materials can achieve desired chemical transformations with efficient mechanical energy utilization, reducing the need for high-temperature processing.¹³²

Waste reduction and resource recovery

Enhanced Recycling and Upcycling: Mechano-chemistry is effective in recycling and upcycling waste materials, converting them into valuable products or reusable resources. The mechanical forces involved in these processes can break down complex waste materials and facilitate the recovery of valuable metals, polymers, and other components.¹³³ Mechanochemical methods are employed to recover REEs from electronic waste, allowing for the recycling of precious materials and reducing the need for virgin resource extraction.¹³⁴

Minimized By-Products and Waste: Mechano-chemical reactions often produce fewer by-products compared to traditional chemical processes. By optimizing reaction conditions and minimizing unnecessary side reactions, mechanochemistry contributes to reduced waste generation and improved process efficiency.¹³⁵ Mechanochemical synthesis of MOFs can result in high yields with minimal by-products, reducing waste and enhancing overall process sustainability.¹³⁶

Pollution prevention and environmental protection

Pollutant Degradation: Mechanochemical processes can be utilized to degrade environmental pollutants and contaminants. The application of mechanical force can activate catalysts or initiate chemical reactions that break down harmful substances into less toxic forms, contributing to environmental cleanup and protection.¹³⁷ Mechanochemical activation of photocatalysts for the degradation of organic pollutants in wastewater treatment systems improves pollutant removal efficiency and reduces environmental pollution.¹³⁸

Soil and Water Remediation: Mechanochemistry is used for soil and water remediation, addressing contamination issues through mechanical processing. This approach can remove or neutralize contaminants in soils and water bodies, improving environmental quality and supporting sustainable land and water management.¹³⁹ Mechanochemical methods are applied to treat contaminated soils by breaking down hazardous compounds and facilitating their removal, contributing to soil restoration and environmental protection.¹⁴⁰

Innovation in sustainable materials and products

Development of Eco-Friendly Materials: Mecha-nochemistry enables the development of sustainable materials with reduced environmental impact. The ability to produce materials from renewable resources or recycle waste products into high-value materials supports the creation of eco-friendly products.¹⁴¹ Mechanochemical processing of biopolymers and renewable resources results in the production of sustainable materials for packaging, construction, and other applications, promoting a circular economy.¹⁴²

Sustainable Manufacturing Processes: Mechano-chemical techniques contribute to sustainable manufacturing by improving process efficiency and reducing resource consumption. Innovations in mechanochemical processing lead to the development of advanced manufacturing methods that are more environmentally friendly and resource-efficient.¹⁴³ Mechanochemical processing techniques are used to manufacture high-performance composites and coatings with reduced environmental impact, supporting sustainable industrial practices.¹⁴⁴

Challenges and future directions in mechanochemistry

Mechanochemistry, while offering numerous advantages in chemical synthesis and environmental applications, also faces several challenges. Addressing these challenges and exploring future directions are essential for advancing the field and maximizing its potential.¹⁴⁵ This section outlines key challenges in mechanochemistry and suggests future research directions to overcome these obstacles and enhance the applicability of mechanochemical processes.

Challenges

Scalability and Industrial Application. Scaling mechanochemical processes from laboratory settings to industrial applications presents significant challenges, primarily due to the specific conditions required for effective mechanochemical methods. These laboratory conditions may not directly translate to larger-scale operations. For instance, high-energy ball milling is a widely used technique for synthesizing nanomaterials in the lab. However, when attempting to scale this process for industrial use, it necessitates substantial optimization to ensure consistent quality, efficiency, and safety. To address this issue, it is crucial to develop scalable mechanochemical reactors and optimize process parameters tailored for industrial applications. In addition, fostering collaboration between researchers and industry stakeholders can facilitate the transition from lab-scale experiments to large-scale production, ultimately enhancing the applicability of mechanochemical processes in various industrial settings.

Process Control and Reproducibility. Controlling and reproducing mechanochemical reactions poses challenges due to the complex and dynamic nature of the mechanical forces involved. Variability in reaction conditions—such as temperature, pressure, and milling intensity—can significantly affect the consistency and reproducibility of results. For instance, differences in milling conditions can lead to variations in particle size distribution and material properties, ultimately impacting the performance of synthesized materials or catalysts. To enhance reproducibility and consistency, advances in process monitoring and control technologies, including real-time sensors and automation, are essential. Furthermore, standardizing experimental protocols and thoroughly characterizing reaction conditions can contribute to improved control and reproducibility in mechanochemical processes.

Understanding Reaction Mechanisms. The detailed mechanisms underlying mechanochemical reactions are not fully understood, making it difficult to predict and control reaction outcomes. The complexity of interactions between mechanical forces and chemical processes, such as the formation of high-energy defects and the influence of mechanical stress on chemical bonds, poses challenges in optimizing mechanochemical processes for specific applications. Continued research into the fundamental principles of mechanochemistry, including theoretical modeling and experimental studies, is vital for enhancing our understanding of these reaction mechanisms. Collaboration with computational chemists and material scientists can provide valuable insights into the underlying processes, ultimately improving process optimization.

Material and Equipment Limitations. The choice of materials and equipment used in mechanochemical processes significantly impacts their effectiveness and efficiency. Certain materials may not be suitable for high-energy milling or other mechanochemical techniques due to their inherent properties. For instance, specific types of grinding media or reactor materials may wear out or degrade during mechanochemical processes, leading to contamination or reduced performance. Addressing these limitations requires ongoing research into new materials and equipment specifically designed for mechanochemical applications. Developing more durable and efficient milling media and reactor designs can enhance the performance and longevity of these processes.

Environmental and Safety Concerns. While mechanochemistry can reduce the use of hazardous solvents, it can also give rise to other environmental and safety concerns, such as dust generation, noise, and the handling of high-energy equipment. For example, high-energy milling processes can generate dust and noise, posing safety and environmental hazards if not properly managed. To mitigate these issues, implementing appropriate safety measures, such as dust collection systems and noise reduction technologies, is essential. In addition, ensuring proper training and safety protocols for personnel handling mechanochemical equipment can further enhance safety in these processes.

Future directions

Integration with Green Chemistry. Mecha-nochemistry can be further integrated with green chemistry principles to develop more sustainable chemical processes. This includes optimizing processes to minimize waste, reduce energy consumption, and use environmentally friendly materials. For instance, research into mechanochemical processes that utilize renewable resources or waste materials as starting materials can support the development of more sustainable and eco-friendly chemical processes.

Advanced Process Optimization. Advances in process optimization techniques, such as machine learning and artificial intelligence, can enhance the efficiency and effectiveness of mechanochemical processes. These technologies can help identify optimal conditions, predict reaction outcomes, and automate process control. For example, machine learning algorithms can analyze experimental data and optimize milling parameters for specific applications, leading to improved process performance and reduced development time.

Exploration of New Applications. Expanding the scope of mechanochemistry to new applications and fields can unlock additional benefits and opportunities. This includes exploring novel materials, catalysts, and reaction systems that can be enhanced through mechanochemical techniques. For instance, investigating mechanochemical approaches for emerging technologies, such as energy storage and conversion, or advanced environmental remediation, can lead to new discoveries and applications.

Development of Innovative Equipment. The design and development of innovative mechanochemical equipment can improve process efficiency and scalability. This includes creating new types of reactors, milling devices, and monitoring systems tailored to mechanochemical applications. Development of high-throughput mechanochemical reactors that can simultaneously process multiple samples or materials can enhance research productivity and facilitate large-scale applications.

Enhanced Fundamental Research. Continued fundamental research into the underlying principles of mechanochemistry can provide valuable insights into reaction mechanisms, energy transfer, and material properties. This knowledge can inform the development of more effective and controlled mechanochemical processes. Advanced experimental techniques, such as in situ imaging and spectroscopy, can be used to study the dynamics of mechanochemical reactions and improve our understanding of reaction pathways and mechanisms.

Mechanochemistry presents both significant opportunities and challenges in advancing chemical processes and applications. Addressing these challenges and exploring future directions will be crucial for enhancing the effectiveness and applicability of mechanochemical techniques. By focusing on process optimization, integration with green chemistry, and the development of innovative equipment and applications, the field of mechanochemistry can continue to make valuable contributions to science, industry, and sustainability.

Limitations of mechanochemistry

While mechanochemistry offers numerous advantages over traditional chemical synthesis, it is essential to acknowledge its limitations. Understanding these challenges can guide future research and optimize mechanochemical processes. Below are some of the key limitations:

Limited Scope of Reactions. Not all chemical reactions can be effectively driven by mechanical energy. Certain reactions, especially those requiring specific conditions such as precise temperatures, pressures, or the presence of solvents, may not be suitable for mechanochemical methods. The scope of applicable reactions is thus somewhat limited compared to traditional synthetic methods, which can accommodate a wider variety of reaction conditions.

Equipment and Energy Requirements. Mechano-chemical processes often necessitate specialized equipment such as high-energy ball mills, which can be expensive and may not be readily available in all laboratories. In addition, the mechanical forces required for effective reactions can lead to increased energy consumption, which could offset some of the sustainability benefits.

Reaction Homogeneity. Achieving uniformity in reaction mixtures can be challenging in mechanochemical systems, particularly when dealing with powders of varying particle sizes or compositions. Inhomogeneity may lead to uneven reaction rates and lower yields, as some portions of the mixture may react while others do not.

Lack of Understanding of Mechanisms. Despite its growing popularity, the underlying mechanisms of mechanochemical reactions are not yet fully understood. Further research is necessary to elucidate the complex interactions and pathways involved, which could help optimize conditions and improve yields.

Environmental and Safety Concerns. While mechanochemistry is generally regarded as a more environmentally friendly approach due to reduced solvent use, there are still potential environmental and safety concerns associated with the mechanical processes themselves. For instance, the generation of heat and pressure can pose risks, and the wear of milling equipment may lead to contamination of the reaction products.

Conclusion

Mechanochemistry has emerged as a transformative field in chemistry, offering innovative approaches to chemical synthesis, materials processing, and environmental applications. Its distinctive reliance on mechanical forces to drive chemical reactions presents a unique set of advantages, including reduced reliance on hazardous solvents, improved energy efficiency, and enhanced sustainability. Throughout this review, we have explored the fundamental principles of mechanochemistry, highlighting how mechanical energy disrupts crystalline structures and induces chemical transformations. The insights into various mechanochemical processes, such as grinding, milling, and ultrasonic treatment, underscore their potential to achieve reactions that are challenging to perform using traditional thermal or chemical methods. Recent advancements in mechanochemistry have demonstrated its growing relevance across diverse applications. The ability to perform reactions with minimal or no solvents aligns with the principles of green chemistry, contributing to safer and more sustainable practices. Mechanochemistry’s role in recycling and resource recovery, especially in the context of valuable metals and materials, further supports its significance in promoting a circular economy. Despite its advantages, mechanochemistry faces several challenges that need to be addressed to fully realize its potential. Issues related to scalability, process control, material limitations, and environmental concerns require ongoing research and innovation. Future directions in mechanochemistry, such as integrating green chemistry principles, optimizing processes with advanced technologies, and exploring new applications, offer promising pathways to overcome these challenges and enhance the field’s impact.

In conclusion, mechanochemistry represents a dynamic and evolving area of research with significant potential to advance both scientific understanding and practical applications. As the field continues to develop, it holds promise for contributing to more sustainable and efficient chemical processes, addressing global challenges, and driving innovation across multiple industries. By embracing these opportunities and addressing existing challenges, mechanochemistry can play a crucial role in shaping the future of chemistry and its applications.

Footnotes

ORCID iD

Anup Basnet Chetry

Ethical considerations

This study did not involve any ethical concerns requiring approval from an institutional review board.

Consent to participate

Not applicable, as this study did not involve human participants.

Consent for publication

Not applicable.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Declaration of conflicting interests

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Data availability statement

The data supporting the findings of this study are available upon reasonable request.

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