The thermal effect on nanofluidic behaviors in a hydrophobic zeolite is investigated experimentally. At a constant temperature, water can be forced to infiltrate into the nanopores as an external pressure is applied and defiltrate as the pressure is lowered, leading to a springlike pressure-volume relationship. As temperature varies, due to the variation in solid-liquid interfacial tension, the infiltration pressure changes significantly. Consequently, the system exhibits a thermally controllable volume memory characteristic, with the energy density higher than that of ordinary shape-memory solids by more than one order of magnitude, providing a promising way for developing high-performance intelligent devices.
In a previous study ͓X. Kong and Y. Qiao, Appl. Phys. Lett. 86, 151919 ͑2005͔͒, we analyzed the energy absorption behaviors of a nanoporous system subjected to quasi-static loadings. In this work, the performance of similar systems under dynamic loadings is investigated through a Hopkinson bar experiment. The energy absorption efficiency increases significantly with the loading rate, which is attributed to the effect of internal friction.
The compressive behaviors of steel cells enhanced by a nanoporous silica functionalized liquid are investigated. As the empty space in the ductile cell is filled by an aqueous suspension of hydrophobic nanoporous silica gel, the work done by the compressive load along the axial direction can be dissipated not only through the ordinary cell-wall buckling but also via the extended yielding and the pressure-induced infiltration. As a result, the energy absorption efficiency, either on mass or on volumetric basis, is considerably improved.
Vapor-liquid phase coexistence and transport properties of two-dimensional oligomers J. Chem. Phys. 137, 084701 (2012) Probing the mobility of supercooled liquid 3-methylpentane at temperatures near the glass transition using rare gas permeation J. Chem. Phys. 137, 064509 (2012) Liquid nitrogen in fluid dynamics: Visualization and velocimetry using frozen particles Rev. Sci. Instrum. 83, 085101 (2012) Interfacial friction between semiflexible polymers and crystalline surfacesThe infiltration of glycerin in a lyophobic nanoporous silica gel is investigated experimentally, and the effective interfacial tension and viscosity are discussed. While the simple superposition principle can be employed for the analysis of interfacial tension, in a nanopore the effective liquid viscosity is no longer a material constant. It is highly dependent on the pore size and the loading rate, much smaller than its bulk counterpart.
To selectively absorb impact energy, the profiles of sorption isotherms of protection systems must be adjusted in a broad spectrum. In this article, a N-Lauroylsarcosine sodium salt ͑sarcosyl͒ of intermediate molecular size is used to control the pressure induced infiltration of a nanoporous silica. The experimental result shows that the infiltration plateau of this system is two-staged; that is, not only the activation pressure but also the infiltration volume can be modified. It is noticed that the sarcosyl molecule demands a "free volume" to enter a nanopore. The free volume size decreases nearly linearly as the sarcosyl concentration increases.
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