Controlling Infiltration Pressure of a Nanoporous Silica Gel via Surface Treatment
نویسندگان
چکیده
منابع مشابه
Controlling Infiltration Pressure of a Nanoporous Silica Gel via Surface Treatment
While it has been a well-known fact that a certain amount of energy would be dissipated as a liquid flows in a channel, not until recently with the development of nanoporous technology did this phenomenon receive wide attention for energy absorption applications. For instance, it was noticed that as water moved from compressive parts of a hydrophilic nanoporous silica to tensile parts, consider...
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When a nanoporous silica gel surface modified by silyl groups is decomposition-treated at a relatively low temperature, while the network is stable, the organic surface layers can be deactivated. As a result, the degree of hydrophobicity, which can be measured by the liquid infiltration pressure, is lowered. The infiltration and defiltration behaviors of liquid are dependent on the controlled d...
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As a liquid moves in the nanopores of a silica gel, because of the hysteresis of sorption behavior, significant energy dissipation can take place. Through a calometric measurement, the characteristics of associated heat generation are investigated. The temperature variation increases with the mass of silica gel, which consists of a reversible part and an irreversible part. The residual temperat...
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By applying an external pressure, an aqueous solution of promoters can be forced into a hydrophobic nanoporous silica gel. The promoter molecule demands a free volume several times larger than itself to enter the nanoenvironment. The free volume size is a function of the promoter concentration. If more than one promoter is used, the system behavior does not follow the principle of superposition...
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ژورنال
عنوان ژورنال: Chemistry Letters
سال: 2007
ISSN: 0366-7022,1348-0715
DOI: 10.1246/cl.2007.882