Study of Penetration of Water into Hydrophobized Porous Silicas

Fadeev, Alexander Y.; Ерошенко, В. А.

doi:10.1006/jcis.1996.4495

Cited by 156 publications

(144 citation statements)

References 5 publications

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“…The key mechanism of colloidal damper is water intrusion and extrusion from nanopores [1]. The difference of intrusion and extrusion pressure brings a hysteresis to the loading-unloading curves.…”

Section: Working Mechanismmentioning

confidence: 99%

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A Novel Approach for Shock Absorber----Colloidal Damper

Yu¹,

Niu²,

Zhao³

2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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Abstract. Using the mixture of nanoporous materials and its associated lyophobic fluid for damping application is a novel technology called colloidal damper. Compression caused liquid intrusion transfers the mechanical energy into interface energy and so that producing damping effect and colloidal damper has great potential as shock absorber. In this paper, a colloidal damper consist water and hydrophobic silica gel particles as working medium is investigated. The working mechanism of colloidal is first introduced. Then, an experiment is conducted to investigate the mechanical properties of colloidal damper. Finally, the energy dissipation performance is analyzed.

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Section: Working Mechanismmentioning

confidence: 99%

“…The solid porous matrix could be silica gel, aerogel, ceramics, glass, zeolites, carbon (graphite, charcoal, fullerenes, and carbon nanotubes), aluminum oxide, etc [1,7]. The associated lyophobic fluids are water, mercury, melted metals, melted flux or melted salts, etc.…”

mentioning

confidence: 99%

A Novel Approach for Shock Absorber----Colloidal Damper

Yu¹,

Niu²,

Zhao³

2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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“…The surface density of trimethylchlorosilane (C1) has been studied by many researchers and was reported as 2 -3 molecules/nm 2 at the maximum density. [27][28][29][30][31] Hence, the estimated surface density of C1, 3.0 molecules/nm 2 , suggests that a densely packed layer of C1 is formed at the inner wall of the silica-nanochannel. In Table 1, it is shown that the surface density is not so high for C4 and C12, which have a longer chain of an alkyl group than C1.…”

Section: Characterization Of the Alkylsilane-modified Namsmentioning

confidence: 99%

Diffusivities of Tris(2,2′-bipyridyl)ruthenium inside Silica- Nanochannels Modified with Alkylsilanes

et al. 2006

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The apparent diffusion coefficients of tris(2,2′-bipyridyl)ruthenium ([Ru(bpy3)] 2+ ) are estimated in silica-nanochannels which are assembled inside columnar alumina pores in an anodic alumina membrane, and are modified with alkylsilanes such as trimethylchlorosilane (C1), butyldimethylchlorosilane (C4), and dodecyldimethylchlorosilane (C12). The estimation is performed by observing the lag-time, which is defined as the time required for [Ru(bpy)3] 2+ to diffuse through alkylsilane-modified silica-nanochannels in the alumina membrane. When ethanol is used as a solvent, the apparent diffusion coefficients of [Ru(bpy)3] 2+ are estimated as 2.1 × 10 -10 and 3.2 × 10 -10 cm 2 s -1 in the C1-and C4-modified silica-nanochannels, respectively. These values are about 10 4 times smaller than that obtained in bulk ethanol. Based on the experimental results on the solvent dependency of the lag-time, the hydrogen-bonding interaction between ethanol molecules is considered to be stronger in the C1-and C4-modified silica-nanochannels than in bulk ethanol, and the hydrogen-bonding interaction plays a critical role for the slow diffusivity in those nanochannels. In contrast, the apparent diffusion coefficient in the C12-modified silica-nanochannel is at least two orders of magnitude larger than those in the C1-and C4-modified silica-nanochannels. This relatively fast diffusion is most likely explained by the presence of a long alkyl chain of C12, which reduces a hindrance effect that is originates in the hydrogen-bonding interaction.

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“…Such dependence is a consequence of the lack of correlations in the mutual arrangement of pores of different sizes in a model of randomly arranged spheres with a narrow pore size distribution δR/R < 3, characteristic for silica gels. For the porous medium MSM 41 more than the strong dependence of the average radius [6,7] due to the peculiarities of the fluctuation formation of the nucleus in a cylindrical channel (see (3)). , and C8W (curves 3) infiltrated with water according to the calculations from relationships (13) and (15).…”

Section: Temperature Dependences Of the Infiltra-tion And Defiltratiomentioning

confidence: 99%

Correlation effects during liquid infiltration into hydrophobic nanoporous media

Borman

Belogorlov

Byrkin

et al. 2011

J. Exp. Theor. Phys.

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Correlation effects arising during liquid infiltration into hydrophobic porous medium are considered. On the basis of these effects a mechanism of energy absorption at filling porous medium by nonwetting liquid is suggested. In accordance with this mechanism, the absorption of mechanical energy is a result expenditure of energy for the formation of menisci in the pores on the shell of the infinite cluster and expenditure of energy for the formation of liquidporous medium interface in the pores belonging to the infinite cluster of filled pores. It was found that in dependences on the porosity and, consequently, in dependences on the number of filled pores neighbors, the thermal effect of filling can be either positive or negative and the cycle of infiltration-defiltration can be closed with full outflow of liquid. It can occur under certain relation between percolation properties of porous medium and the energy characteristics of the liquid-porous medium interface and the liquid-gas interface. It is shown that a consecutive account of these correlation effects and percolation properties of the pores space during infiltration allow to describe all experimental data under discussion.

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Study of Penetration of Water into Hydrophobized Porous Silicas

Cited by 156 publications

References 5 publications

A Novel Approach for Shock Absorber----Colloidal Damper

A Novel Approach for Shock Absorber----Colloidal Damper

Diffusivities of Tris(2,2′-bipyridyl)ruthenium inside Silica- Nanochannels Modified with Alkylsilanes

Correlation effects during liquid infiltration into hydrophobic nanoporous media

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