On the origin of increased activity in mechanochemistry of solids

Thiessen, Karsten Peter

doi:10.1051/jcp/1986830717

Cited by 22 publications

(5 citation statements)

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“…As an example of a nonconventional plasma, the free radicals, deformed bonds, ions, and free electrons generated at newly formed surfaces in the mechanochemical process may account for a "triboplasma," as shown by Thiessen. 35 As mentioned above, FAST may also generate a nonconventional, local, and transient plasma. In electric discharge sintering, Burenkov et al 36 showed the occurrence of arcs and thermal plasmas.…”

Section: Surface Effects In Fastmentioning

confidence: 96%

Surface effects in field-assisted sintering

2001

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The more-stringent requirements for densification of new out-of-equilibrium powders have created a growing demand for nonconventional rapid sintering processes. Among those, field-assisted sintering techniques (FASTs) have seen a recent renewed interest motivated by their ability to consolidate a large variety of powder materials into high densities in short times. Characterization of a range of FAST-consolidated materials displayed relevant associated surface effects, such as grain boundary cleaning with direct grain-to-grain contact and advanced densification without sintering aids. These effects may be attributed to phenomena ranging from dielectric breakdown to a possible nonconventional plasma generation. Such surface effects provided a better intergranular bonding of powder particles during subsequent sintering.

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Section: Surface Effects In Fastmentioning

confidence: 96%

Surface effects in field-assisted sintering

2001

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“…In practice, the more general term mechanochemistry appears to survive. Moreover, it is increasingly used as a complete synonym of tribology , also when describing ball milling, grinding, and friction ( Thiessen, 1986 ). This hazy nomenclature would not create much problem if it were always straightforward to identify which mechanically induced physical processes in solids were responsible for the chemical processes of bond cleavage and formation.…”

Section: What Is In a Name?mentioning

confidence: 99%

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Michalchuk

Болдырева²,

Belenguer³

et al. 2021

Front. Chem.

135

108

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Over the decades, the application of mechanical force to influence chemical reactions has been called by various names: mechanochemistry, tribochemistry, mechanical alloying, to name but a few. The evolution of these terms has largely mirrored the understanding of the field. But what is meant by these terms, why have they evolved, and does it really matter how a process is called? Which parameters should be defined to describe unambiguously the experimental conditions such that others can reproduce the results, or to allow a meaningful comparison between processes explored under different conditions? Can the information on the process be encoded in a clear, concise, and self-explanatory way? We address these questions in this Opinion contribution, which we hope will spark timely and constructive discussion across the international mechanochemical community.

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“…While the specifics of micro-scale mechanochemical processes are quite vague, it has been suggested by Matteazzi et al 41 for ball-milling of powders, that the generation of free radicals, deformed bonds, and ions and free electrons at newly formed, nascent surfaces, during inter-particle collisions can give rise to a so-called "tribo-plasma", which can make it possible for inter-particle bonding and/or mechanical alloying to occur in the solidstate. 42 …”

Section: Mechanisms Of Reactionmentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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On the origin of increased activity in mechanochemistry of solids

Cited by 22 publications

References 0 publications

Surface effects in field-assisted sintering

Surface effects in field-assisted sintering

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

Shock compression of reactive powder mixtures

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