Novel and global approach of the complex and interconnected phenomena related to the contact line movement past a solid surface from hydrophobized silica gel

Suciu, Claudiu Valentin; Iwatsubo, Takuzo; Yaguchi, Kazuhiko; Ikenaga, Masayoshi

doi:10.1016/j.jcis.2004.08.034

Cited by 46 publications

(45 citation statements)

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“…edu/). For instance, some modified silica gels, in association with water and aqueous solutions, have been used to build efficient innovative colloidal dampers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Other systems can work as springs [4,8], as thermal machines in appropriate thermodynamic cycles [1,[4][5], or to convert the mechanical and/or thermal energy into electrical energy [21].…”

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confidence: 99%

Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension

Suciu

Yaguchi

2008

Exp Mech

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Endurance tests on a colloidal damper destined to vehicle suspension are performed. Such absorber represents an ecological application of nano-damping; it employs the hysteresis which occurs when water is forced to penetrate and then naturally exudes from a nanoporous silica gel matrix, modified to become liquid-repellent. Damping performances decrease at the increasing of the number of working cycles, partially since the silica gel grains that undergo gradual fatigue fracture are able to escape at the packing used to seal the test chamber, and partially due to the fatigue fracture alone, which is accompanied by an enhancement of the hydrophilic silanol groups on the silica gel surface and a pore size redistribution. In order to augment damper's life, silica gel is introduced inside of a tank that is separated by a filter from the main cylinder, in which only water is supplied. One discusses the influence of filtration on the colloidal damper performances and the variation of damper's life versus the ratio of filter pore's diameter to the mean size of the silica gel particles.

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confidence: 99%

Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension

Suciu

Yaguchi

2008

Exp Mech

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“…In this case, the mechanical work dissipated by the system is not equal to the total heat release, as it was described in [44]. The phenomenon of nonoutflow associated with the change in the internal energy is characteristic of the majority of the studied hydrophobic porous media and liquids, namely, water [7,10,19,20,23,24,[33][34][35]37], aqueous solutions of salts [12,27,28], organic compounds, ethylene glycol [5], alcohol [26], and glycerol [45], as well as systems with the liquid metal [1], Wood's alloy [4], and mercury [61,62].…”

Section: Conditions For the Closed Cyclementioning

confidence: 94%

“…The change of the internal energy ∆E also depends on the length (n) of the grafted n-alkylsilane molecule. It is worth noting that, for water and silica gels, an increase in n from 4 to 18 leads to a increase δσ, a decrease in the nonoutflow and a decrease in the change of the internal energy ∆E [7,8,[16][17][18][19][20], whereas for water and the modified medium, the closed cycle is observed for n = 1 and the complete nonoutflow takes place for n = 8 [32]. An increase in the concentration of the NaCl or CaCl 2 salt in the aqueous solution in specific ranges leads to an increase in the quantity δσ and a decrease in the change of the internal energy ∆E for the Fluka 100 C8 silica gel [25,27,28,32].…”

Section: Conditions For the Closed Cyclementioning

confidence: 99%

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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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“…So water molecules first fill the pores that have the largest apertures and the smallest contact angles and then fill the smaller pores with larger contact angles and so on till all pores are filled with water under external pressure. The difference between intrusion pressure and extrusion pressure is attributed to contact angle hysteresis, which occurs for a rough surface or a chemical heterogeneous surface [6]. When the contact angle is dynamically measured, one can observe different values of advancing angle θa and receding angle θr (θa>θr) as shown in fig.…”

Section: Working Mechanismmentioning

confidence: 98%

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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Novel and global approach of the complex and interconnected phenomena related to the contact line movement past a solid surface from hydrophobized silica gel

Cited by 46 publications

References 50 publications

Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension

Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension

Correlation effects during liquid infiltration into hydrophobic nanoporous media

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

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