Colloid Journal

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Experimental Study of Transport Coefficients of Aqueous Suspensions of Nanodiamonds
Colloid Journal - Tập 82 - Trang 705-712 - 2020
M. I. Pryazhnikov, A. V. Minakov, A. I. Lyamkin, V. E. Red’kin, S. M. Zharkov, G. M. Zeer
This article presents experimental data on the coefficients of viscosity and thermal and electrical conductivities, as well as the absorption spectra, of suspensions of ultradispersed diamonds. Suspensions of UDA-S and UDP-A detonation nanodiamond particles, as well as UDP-AG diamond–graphite powder, are used in the experiments. The concentration of nanodiamonds in distilled water is varied within...... hiện toàn bộ
The adsorption properties of aluminophosphates prepared by the template method from deanionized alumina sol
Colloid Journal - Tập 68 - Trang 194-200 - 2006
T. F. Kuznetsova, A. I. Rat’ko, O. A. Kudina
Isotherms of adsorption-desorption of tetrachloromethane vapors by mesoporous aluminophosphate precipitated with the cetylpyridinium template from an alumina sol deanionized by ion-exchange are measured. As the concentration of the cetylpyridinium template varies from 0.045 to 1.8 wt %, the aluminophosphate samples are shown to have a bi-or unimodal distribution of the volume of mesopores with res...... hiện toàn bộ
Elastic properties of a nematic in a tetrapalladium organyl-pentadecane system
Colloid Journal - Tập 70 - Trang 268-273 - 2008
A. V. Golovanov, G. V. Ryabchuk
The temperature dependences of birefringence Δn, anisotropy of permittivity ɛa, and elastic constants K 11 and K 33 in the nematic phase of a tetrapalladium organyl-pentadecane system with a pentadecane content of 55 wt % have been investigated experimentally. It has been shown that, as temperature is elevated, ɛa, K 11, and K...... hiện toàn bộ
Kinetics of lecithin oxidation in liposomal aqueous solutions
Colloid Journal - Tập 73 - Trang 815-821 - 2011
E. A. Mengele, I. G. Plashchina, O. T. Kasaikina
The peculiarities of egg phosphatidylcholine (lecithin) oxidation with molecular oxygen in aqueous media are investigated. Under the action of ultrasound, lecithin forms multilamellar liposomes or vesicles in aqueous solutions. Lecithin is oxidized through a chain free-radical mechanism. The nonlinear dependence of the rate of oxygen absorption on the substrate concentration and the imitation of t...... hiện toàn bộ
Formation of submicrometer-scale gold nanoparticle aggregates and their self-organization into “supracrystals”
Colloid Journal - Tập 69 - Trang 391-393 - 2007
Yonglan Luo
Nearly spherical, submicrometer-scale gold nanoparticle aggregates about 250 nm in diameter are formed directly from an HAuCl4-p-phenylenediamine aqueous solution at room temperature. The as-formed aggregates were characterized by various techniques, including scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, and their formation mechanism is discussed. It is ve...... hiện toàn bộ
Electrosurface Properties of Hydr(oxides) and Oxide Nanostructures in 1 : 1 Electrolyte Solutions: 2. Electrokinetic Characteristics of Boehmite, Goethite, and Silicon Dioxide
Colloid Journal - Tập 63 - Trang 568-572 - 2001
A. V. Klebanov, N. F. Bogdanova, L. E. Ermakova, M. P. Sidorova
The electrophoretic mobility of particles of silicon dioxide, aluminum hydroxide, and iron hydroxide was measured as a function of pH in NaCl and KCl background solutions. Isoelectric points for the investigated objects were determined. Electrokinetic potentials were calculated with allowances for the particle shape and the polarization of the electrical double layer within the framework of the Ov...... hiện toàn bộ
Inhibitive effect of potassium methylsiliconate on hydration swelling of montmorillonite
Colloid Journal - - 2014
Guancheng Jiang, Xuan Yang, Y. Li, Jianliang Wang
Equilibrium sorption of hexavalent chromium from aqueous solution using synthetic hematite
Colloid Journal - Tập 74 - Trang 420-426 - 2012
H. I. Adegoke, F. A. Adekola
Hematite sample prepared by transformation of ferrihydrite was used to remove Cr(VI) from aqueous solution. Effects of initial concentration, contact time, pH, ionic strength, and temperature were investigated. The data were fitted to Langmuir, Freundlich, Dubinin-Kaganer-Radushkevich and Temkin models of adsorption. The results showed the best fit to the Langmuir isotherm. The increase of pH as w...... hiện toàn bộ
Viscous Flow Through Polydisperse Row of Parallel Fibers: Account for the Slip Effect
Colloid Journal - Tập 62 - Trang 731-745 - 2000
M. N. Lebedev, I. B. Stechkina, A. L. Chernyakov
A general theory of the flow through the flat periodic row of parallel polydisperse fibers randomly arranged at the fiber period is elaborated. An approximate solution of the problem with account for the slip effect at low Reynolds numbers is obtained for normal incident flow. The system of equations for determining local drag forces acting on each fiber in a row, as well as the system of equation...... hiện toàn bộ
Heterogeneous Nucleation of Ice in Dispersed Phase of Water-in-Decane Emulsion
Colloid Journal - Tập 81 - Trang 199-203 - 2019
V. A. Shestakov, V. I. Kosyakov, A. Yu. Manakov, A. S. Stoporev, E. V. Grachev
A model developed for the description of experimental data on heterogeneous nucleation in disperse systems with metastable dispersed phases is applied to the case of ice nucleation in a water emulsion in decane under methane pressure . Activity spectra are obtained for ice-forming particles in the water–decane–methane system. The frequency of ice nucleation on these particles is calculated. Activi...... hiện toàn bộ
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