Nanocrystalline Ag formed by low-temperature high-energy mechanical attrition

Xu, J.; Yin, Jiao; Ma, Evan

doi:10.1016/s0965-9773(97)00069-x

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…Table 5 lists the calculated values of DG v (293), DE 2 , c RT gb , c ca and D Ã 1 ð293Þ for above metals. The experimentally observed minimum grain sizes during MM process, D Ã obs: , for different metals [48][49][50][51][52][53][54][55][56] are also listed in Table 5.…”

Section: Dg(293) and D ã 1 (293) Of Metallic Elementsmentioning

confidence: 99%

“…Except Table 4 Values of solid surface energies at 0 K, c 0 s [41], temperature coefficients of solid surface energy, dc T s =dT [40], solid surface energies at room temperature, c RT s , ratios of grain boundary energy to solid surface energy, n [42][43][44][45][46], the grain boundary energies at room temperature and at 0 K, c RT gb and c 0 gb , for the metallic Cd, Co, Cr, Hf, Ir, Mo, Nb, Pd, Rh, Ru, Sn, Ta The n values are estimated as 1/3 when they are not available from the literature. Table 5 Lists of Gibbs free energy differences per unit volume between crystalline and amorphous states, DG v (293), strain energy density changes, DE 2 , grain boundary energies at room temperature, c RT gb , crystalline-amorphous interfacial energies, c ca [47], calculated critical grain sizes, D Ã 1 ð293Þ at room temperature, and experimentally observed minimum grain sizes by mechanical-milling, D Ã obs: , [48][49][50][51][52][53][54][55][56] elemental Ni, D Ã 1 ð0Þ is smaller than D Ã 1 ð293Þ for a certain metal. Fig.…”

Section: Temperature Dependence Of D ã 1 (T) Of Metalsmentioning

confidence: 99%

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Thermodynamic model for solid-state amorphization of pure elements by mechanical-milling

Zhao

2006

Journal of Non-Crystalline Solids

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Section: Dg(293) and D ã 1 (293) Of Metallic Elementsmentioning

confidence: 99%

Section: Temperature Dependence Of D ã 1 (T) Of Metalsmentioning

confidence: 99%

Thermodynamic model for solid-state amorphization of pure elements by mechanical-milling

Zhao

2006

Journal of Non-Crystalline Solids

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“…AgNPs can be synthesized by chemical and physical methods. The physical means, including evaporation and condensation method and mechanical ball milling, have the disadvantages of AgNP coalescence, introducing impurities and/or resulting in uneven particle distribution. Regarding the chemical methods, synthesis of monodisperse AgNPs requires the use of capping agent, reducing agent, and reaction solvent, typically involving the utilization of toxic or nonsustainable chemicals and/or cumbersome operation procedure .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Cellulose Nanofibrils Decorated with Ag Nanoparticles and Their Application in Colorimetric Detection of l-Cysteine

Guan

et al. 2020

ACS Sustainable Chem. Eng.

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In this study, we reported an environmentally benign method for the synthesis of silver nanoparticles (AgNPs) by using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (CNFs) as the only reducing agent and stabilizer under mild aqueous conditions. The AgNPs were tightly adhered to the CNF surface, and the resulting stable CNF–AgNP suspension can be used for rapid and selective detection of l-cysteine (Cys). The efficacy of the process relies upon the surface plasmon resonance properties of AgNPs and the aggregation effect of AgNPs in the presence of Cys. Under optimal ionic strength provided by NaCl, Cys interacted with AgNPs, leading to a change in yellow color of the CNF–AgNP to purple. The colloidal suspension showed high sensitivity (limit of detection of 49 nM) and rapid (5 min) and selective detection of Cys among 20 amino acids that make up human proteins, hence demonstrating great potential for analyzing practical samples.

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“…[20] One would not expect a significant gain in %EL and uniform elongation over RT values at 77 K. In summary, our results demonstrate strong and ductile metals useful for cryogenic processing and load-bearing applications, combining remarkable yield strength and high ductility, for all three major crystal structures. The long-term stability of the ultrafine grain structure during service [23] is no longer a major concern because of the very limited diffusion at low temperatures. Finally, the same benefits can also be derived from alloys using the same principle.…”

mentioning

confidence: 99%

Tough Nanostructured Metals at Cryogenic Temperatures

Wang¹,

Ma²,

Valiev

et al. 2004

Advanced Materials

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150

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Metallic materials are widely used for cryogenic applications [1±4] in fields such as space exploration, liquefied gas storage, energy conversion, fusion, high-energy physics, superconductivity, and biomedical engineering. Strong, ductile, and stable materials are necessary for such cryogenic technologies, for example, in order to sustain the large forces generated by superconducting magnetic fields.[4] Heavy alloying is often used, at the expense of the electrical, magnetic, thermal, chemical, and biological properties.[1] For example, a high content of alloying elements may degrade the resistance to unwanted chemical reactions and corrosion, the high thermal and electrical conductivity, and the biocompatibility of elemental metals. It is therefore important to develop high-performance metals of similar strength and ductility to the alloys, without sacrificing the desirable properties of the pure material. Nanostructured metals have attracted considerable interest in recent years. It is important to identify and exploit the unique and superior mechanical properties, as well as the new applications, of these novel materials. In particular, their potential at cryogenic temperatures has not been systematically explored thus far. Nanostructured metals are polycrystals with microstructural features on a scale below 100 nm. These features can be high-angle grain boundaries (in which case the material is considered nanocrystalline), or low-angle grain boundaries and sub-grain domain/mosaic structures (in which case the grains are usually described as ultrafine, with sizes on the sub-micrometer scale).

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Nanocrystalline Ag formed by low-temperature high-energy mechanical attrition

Cited by 13 publications

References 17 publications

Thermodynamic model for solid-state amorphization of pure elements by mechanical-milling

Thermodynamic model for solid-state amorphization of pure elements by mechanical-milling

Green Synthesis of Cellulose Nanofibrils Decorated with Ag Nanoparticles and Their Application in Colorimetric Detection of l-Cysteine

Tough Nanostructured Metals at Cryogenic Temperatures

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