scholarly journals Wetting of isotropic mickrotextures formed on the surface of glass and aluminium

2019 ◽  
Vol 55 (3) ◽  
pp. 309-317
Author(s):  
V. D. Koshevar ◽  
I. P. Kazhuro ◽  
V. G. Shkadrecova ◽  
A. S. Pismenskaya
Keyword(s):  
Silicon Oxide ◽  
Chemical Deposition ◽  
Wetting Angle ◽  
Thin Coatings ◽  
Hydrophobic Coatings ◽  
Silicon Oxide Nanoparticles ◽  
Polymer Dispersed ◽  
Wetting Hysteresis ◽  
Glass Surfaces ◽  
Carbon Nanocomposite

The paper studies the wetting of aluminum and glass surfaces with disordered roughness created by technologically simple methods: chemical deposition with simultaneous self-organization of nanoparticles on microprotrusions and valleys, as well as the application of thin coatings using polymer-dispersed systems with polymodal particle size distribution. Super-hydrophobic coatings with an edge wetting angle of 160–170° and a wetting hysteresis of no more than 10° on electrochemically nanostructured aluminum, processed by the dispersion with the polymodal distribution of aerosil microparticles, silicon oxide nanoparticles SiDB and carbon nanocomposite SHDB (Nanosintal, Belarus) in fluorinated varnish. The regularities of changes in the wetting angle of silicate glass with the coating of the same varnish with small additives were established, showing its significant growth with an increase in the content of aerosil microparticles and a decrease in the lacquer concentration. The increase in the content of SiDB and SHDB does not significantly affect the contact angle, but it significantly reduces the hysteresis of its wetting, which gives the glass the effect of “lotus”.

scholarly journals Экспериментальное исследование влияния добавки наночастиц оксида кремния на характеристики смачиваемости нефтью горной породы

2020 ◽  
Vol 46 (24) ◽  
pp. 30
Author(s):  
А.В. Минаков ◽  
М.И. Пряжников ◽  
Я.Н. Сулемана ◽  
В.Д. Мешкова
Keyword(s):  
Interfacial Tension ◽  
Silicon Oxide ◽  
Experimental Studies ◽  
Wetting Angle ◽  
Surface Wettability ◽  
Oxide Nanoparticles ◽  
Rock System ◽  
Silicon Oxide Nanoparticles ◽  
First Time ◽  
Mass Concentrations

The results of experimental studies of interfacial tension and surface wettability in the nanoscale suspension/oil/rock system were presented. For the first time, the influence of the concentration and size of silicon oxide nanoparticles on the interfacial tension coefficient and the wetting angle was systematically studied. Wide ranges of nanoparticle mass concentrations(from 0 to 1wt.%)and their average sizes(from 5 to 50 nm) were considered. It is established that the use of nanosuspensions allows to radically change the wettability of rock with oil. This effect is significantly dependent on the concentration and size of nanoparticles.

scholarly journals Estimation of anti-icing properties of coatings

2019 ◽  
Vol 135 ◽  
pp. 01009
Author(s):  
Valentina Loganina ◽  
Svetlana Kislitsyna
Keyword(s):  
Initial Period ◽  
Wetting Angle ◽  
Silicone Resin ◽  
Thermal Imager ◽  
Freezing Front ◽  
Properties Of Coatings ◽  
Metal Structures ◽  
Wetting Hysteresis ◽  
Inclined Surface ◽  
Kinetics Of

The proposed composition for anti-icing coating of metal structures. The composition contains as the filler used aerosil brand R 972 with a density of 2360 kg / m3, particle size of 16 nm and a specific surface 12000 m2 / kg. Silicone resin SILRES® MSE 100 with a 10% concentration was used as a binder. The degree of hydrophobicity was estimated by the value of the wetting angle. In order to characterize the anti-icing properties of the coatings, we used the static and dynamic (advancing and retreating) wetting angle, as well as wetting hysteresis, for which we measured the angles of leakage, and the angles of drift from. Studies of the dynamics of freezing drops on the surface were performed using a TESTO 875-1 thermal imager. It is shown, that the hysteresis of wetting of the superhydrophobic surface based on the developed composition is 3.7 degrees. The critical angle of rolling drops of water from an inclined surface is determined. In the study of the kinetics of freezing of a drop of water on a metal surface, an uneven distribution of temperature on the surface of a drop of water is observed. The process of freezing drops is multistage. In the initial period, there is a transfer of heat from the surface to a drop of water. This stage is followed by the process of freezing the drop, which is manifested in the movement of the freezing front from the substrate upwards.

scholarly journals Повышение эффективности полимерного нанокомпозита для формирования фотонных структур методом оптической записи

2020 ◽  
Vol 128 (10) ◽  
pp. 1512
Author(s):  
Ю.Э. Бурункова ◽  
Д. Альхалил ◽  
Д.С. Свяжина
Keyword(s):  
Silicon Oxide ◽  
Optical Recording ◽  
Refractive Indices ◽  
Photosensitive Polymer ◽  
Recording Material ◽  
Silicon Oxide Nanoparticles ◽  
Multibeam Interference ◽  
2D And 3D ◽  
The Given

In this work, the conditions for optimizing an optical recording material based on photosensitive acrylate-urethane nanocomposites with silicon oxide nanoparticles, for efficient Bragg gratings recording by multibeam interference method is presented. It was shown that the choice of the most effective monomers and their concentrations in the nanocomposite which depends on their structure and polymerization rate, followed by determination of the optimal recording radiation intensity for the given composition, makes it possible to adjust the conditions for component diffusion and redistribution, and hence, the formation of regions with different refractive indices in the recording medium. These results can be useful for creating complex 2D and 3D photonic structures based on the targeted modification of photosensitive polymer nanocomposites with different properties (luminescent, nonlinear optical, etc.).

scholarly journals Исследование влияния добавки наночастиц гидрофобного оксида кремния на коллоидную устойчивость обратных эмульсий

2021 ◽  
Vol 47 (15) ◽  
pp. 11
Author(s):  
Е.И. Михиенкова ◽  
А.В. Минаков ◽  
С.В. Лысаков ◽  
А.Л. Неверов ◽  
М.И. Пряжников
Keyword(s):  
Silicon Oxide ◽  
Experimental Studies ◽  
Sio2 Nanoparticles ◽  
Oxide Nanoparticles ◽  
Volume Fractions ◽  
Mineral Oils ◽  
Low Concentrations ◽  
Silicon Oxide Nanoparticles ◽  
The Stability ◽  
Hydrophobic Sio2

The results of experimental studies of the effect of the addition of silicon oxide nanoparticles on the stability of inverse emulsions based on mineral oils are presented. The concentration of nanoparticles in the emulsion was varied from 0.25 to 2 wt%. The following ratios of the volume fractions of the hydrocarbon phase and water were investigated: 70/30, 80/20, 90/10. Several types of emulsifiers have been considered. It has been shown that, even at low concentrations, hydrophobic SiO2 nanoparticles significantly improve the stability of inverse emulsions. Destabilization rate of the emulsion upon addition of 2 wt%. of nanoparticles decreases 1.7 times.

scholarly journals Crystalline Evaluation of Size-Controlled Silicon and Silicon Oxide Nanoparticles Produced by Solution Plasma Discharge

2019 ◽  
Vol 60 (5) ◽  
pp. 688-692 ◽  
Author(s):  
Hitoshi Sasaki ◽  
Genki Saito ◽  
Norihito Sakaguchi ◽  
Ryo Ota ◽  
Heishichiro Takahashi
Keyword(s):  
Silicon Oxide ◽  
Plasma Discharge ◽  
Oxide Nanoparticles ◽  
Silicon Oxide Nanoparticles ◽  
Size Controlled
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