Results 1 - 10 of 74359
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[en] The controlled generation of nano-particles has been an important issue for the nano-structure formation in processing plasmas. We observed that the particle growth under UV irradiation was enhanced due to electric charge reduction of the particles, suggesting that the variation of particle charges could be a control parameter for the particle growth. The particle growth variation by UV irradiation is well described by the particle coagulation model with time-dependent particle charges in consideration, where predator particles grow by adsorbing a few nanometer-sized proto-particles.
[en] This work aims to evaluate the tribological performance of the newly synthesized silane surface treated crab, periwinkle and scallop shell powders in the epoxy modified Phenolic Friction Composites (FCs). The raw and silane treated shell powders are synthesized and characterized for its morphology, element composition and crystal properties. FCs are fabricated with the raw and silane surface treated shell powders using compression moulding process. The tribological performances of the shell powder based brake pads are studied based on IS 2742 standard. The performance of the samples is evaluated and ranked based on Extension Evaluation Method (EEM) considering 11 tribological parameters. The silane treated scallop shell based FC exhibited the best overall tribological performance and expressed as the weighted average dependent degree in EEM. (paper)
[en] A short description of an NFP-Collector (Negatively Charged Fine-Particle Collector) proposed for the collection and removal of fine particles in dusty plasmas is presented. The effects of the Collector on silane plasma, in which dusty fine particles are formed, are presented
[en] We report measurements of the breakdown curves of an rf capacitive discharge in low pressure silane. The electron drift velocity was determined from the locations of the turning point and of the minimum in the breakdown curves in the range E/p = 145-1292 V cm-1 Torr-1. We compare our results to values calculated from the published cross-sections in the range E/p = 1-2000 V cm-1 Torr-1 and data calculated in other papers and find good agreement
[en] This study examines adhesion between silane-coated micromachined surfaces that are exposed to humid conditions. Our quantitative values for interfacial adhesion energies are determined from an in-situ optical measurement of deformations in partly-adhered cantilever beams. We coated micromachined cantilevers with either ODTS (C(sub 18)H(sub 37)SiCl(sub 3)) or FDTS (C(sub 8)F(sub 17)C(sub 2)H(sub 4)SiCl(sub 3)) with the objective of creating hydrophobic surfaces whose adhesion would be independent of humidity. In both cases, the adhesion energy is significantly lower than for uncoated, hydrophilic surfaces. For relative humidities (RH) less than 95% (ODTS) and 80% (FDTS) the adhesion energy was extremely low and constant. In fact, ODTS-coated beams exposed to saturated humidity conditions and long (48 hour) exposures showed only a factor of two increase in adhesion energy. Surprisingly, FDTS coated beams, which initially have a higher contact angle (115(degree)) with water than do ODTS coated beams (112(degree)), proved to be much more sensitive to humidity. The FDTS coated surfaces showed a factor of one hundred increase in adhesion energy after a seven hour exposure to 90% RH. Atomic force microscopy revealed agglomerated coating material after exposed to high RH, suggesting a redistribution of the monolayer film. This agglomeration was more prominent for FDTS than ODTS. These findings suggest a new mechanism for uptake of moisture under high humidity conditions. At high humidities, the silane coatings can reconfigure from a surface to a bulk phase leaving behind locally hydrophilic sites which increase the average measured adhesion energy. In order for the adhesion increase to be observed, a significant fraction of the monolayer must be converted from the surface to the bulk phase
[en] Dust growth in silane-based plasmas is known to be a cyclic phenomenon as long as silane is provided. This continuous dust growth leads to an unstable behavior of the complex plasma, characterized by well-defined instabilities. In this paper, a complete study of these instabilities is presented. The electrical analysis is corroborated by an optical one, and high speed video imaging is used to get an insight in the dust cloud behavior. A possible cause of this instability phenomenon is also discussed.
[en] A small concentration of stable higher silanes (HS) build up in an (initially) pure-silane discharge. Here it is shown that these HS cause a major increase in particle growth rates but have no effect on film growth rates. This explains the observed increase of growth rate during the first seconds of a transient discharge, as the HS build up toward a steady-state concentration of several percent. A rapid increase in particle versus film growth rate also occurs at larger values of discharge power and pressure, and the HS also appear to cause this. Possible reasons for this extreme sensitivity of particles, but not of films, to the HS are evaluated
[en] Highlights: • We investigate SiH bond activation of SiH4 by Be atoms. • Excited Be(1P:2s12p1) atoms insert one SiH bond spontaneously. • HBeSiH3 rearranged to HBe(μ-H)3Si upon photolysis. • 3c-2e bond was formed in HBe(μ-H)3Si through hydrogen bridged bond. Laser-ablated beryllium atoms have been reacted with silane molecules during condensation in excess neon and argon at 4 K. Absorptions due to HBeSiH3 and HBe(μ-H)3Si were observed and identified on the basis of isotopic IR spectroscopy, deuterium substitution with SiD4, and quantum chemical frequency calculations. The observed results show excited Be atom (1P1:2s12p1) can insert into SiH bond spontaneously and the insertion product rearranges to HBe(μ-H)3Si upon photolysis. The electron localization function (ELF) analysis suggests that 3c-2e hydrogen bridge bond (BeHSi) was formed by the donation of electrons for SiH σ bond to the empty p orbital of Be atom for HBe(μ-H)3Si molecule, which shows much difference from CH bond complexes.
[en] This paper presents an original method for the synthesis of hydrophobic oil sorbent based on synthetic monosilicate of calcium with xonotlite structure hydrophobized by the addition of silanesiloxane microemulsion and the nanosized magnetic phase of iron oxides (magnetite)
[ru]В настоящей работе представлен оригинальный способ для синтеза гидрофобного нефтесорбента на основе синтетического моносиликата кальция со структурой ксонотлита, гидрофобизированный добавкой силан-силоксановой микроэмульсии и включающий наноразмерную магнитную фазу оксидов железа (магнетита)