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RITVA LINDBERG GORAN SUNDHOLM JOHAN SJö BLOM PETRI AHONEN ESKO I. KAUPPINEN 《Journal of Dispersion Science and Technology》2013,34(1-2):715-722
The zeta-potentials of silica, copper, platinum and gold particles have been measured as a function of pH. The isoelectric points were found to be at pH 3.0, 5.8, 3.0 and 3.5, respectively. In the pH range 3.0 to 5.8 copper and silica particles are oppositely charged and accordingly the coating of silica with copper particles could be demonstrated. In the case of gold and platinum the sign of the charge is such that direct adhesion to silica particles cannot be expected and this was also demonstrated in the case of platinum. 相似文献
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J. Bares 《Journal of Polymer Science.Polymer Physics》1971,9(7):1271-1285
The viscoelastic behavior of two different ethylene–propylene copolymers was studied as a function of the molar ratios of the components and the distribution of the lengths of the ethylene and propylene sequences. The glass transition temperatures Tg agree with the values calculated from relations between Tg and component ratio established by other authors. The copolymer with longer ethylene and propylene sequences was found to exhibit a relaxation spectrum with a slope less steep than ?0.5. This broadening is explained by the broader distribution of friction factors of the statistical segments in this copolymer and by differences in crystallike nearest-neighbor packing. 相似文献
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van Enk SJ 《Physical review letters》2000,84(4):789; author reply 790
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A new method utilizing laser induced desorption (LID) is used to study the decomposition of methanol on Ni(100) in real time. The dependence of the rate of decompositition on surface coverage and on surface temperature is measured. The decomposition rate decreases during reaction in a manner characteristic of a self-poisoned reaction. The rate data are fit to a model in which the energy barrier to reaction increases in proportion to the coverage of the CH3O product. The energy barrier obtained is 9 kcal mol?1 plus 4 kcal mol?1 monolayer?1 of CH3O. The frequency factor of 2 × 109 s?1 suggests there is significant entropy barrier to decomposition. Substitution of deuterium for the alcoholic hydrogen alters de decomposition rate appreciably and identifies the breaking of the OH bond as the rate determining step. 相似文献
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Douglas McHugh Sherry SJ Hu Neta Rimmerman Ana Juknat Zvi Vogel J Michael Walker Heather B Bradshaw 《BMC neuroscience》2010,11(1):44