Effects of decomposition-treatment temperature on infiltration pressure of a surface modified nanoporous silica gel

Abstract

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 decomposition-treatment time, the liquid composition, as well as the testing temperature. By adding electrolyte or using higher testing temperature, the infiltration pressure can be increased and the defiltration can be promoted.

Superhydrophobic silica wool—a facile route to separating oil and hydrophobic solvents from water

“…The latter experiment showed the importance of the initial hydroxylation; this is proposed to produce a greater density of surface silanol groups [32], which then in turn produce a higher density of TMS groups on the surface. The higher density of TMS groups results in a more hydrophobic material, and thus a material with greater selective absorption of oils [33]. …”

Understanding Energy Absorption Behaviors of Nanoporous Materials

“…This mechanism can be combined with the liquid infiltration to further enhance the system performance. (7) Preliminary experiments were performed on energy-related applications of NMF liquids. When solvated ions are forced into the nanopores, at the large nanopore surface a large electrostatic charge can be generated, which is potentially useful for harvesting electricity from mechanical motions.…”

“…The surface treatment was performed in a 100-mL round bottom flask, based on the technique discussed by Lim and Stein. 7 Prior to the treatment, the silica gel was vacuum dried at 100 o C for 24 h. Immediately after the flask was taken out of the oven, a glass topper was used to seal it. Then, 40 mL of Sigma-244511 dry toluene was injected into the flask.…”

A thermally sensitive energy-absorbing composite functionalized by nanoporous carbon

“…[11][12][13][14] The matrix must be a liquid or a gel, which is flowable under an external loading. The fillers are nanoporous particles.…”