Van der Waals-Like Isotherms in a Confined Electrolyte by Spherical and Cylindrical Nanopores

Autor:	Gabriel Eloy Aguilar-Pineda, Felipe Jiménez-Ángeles, Marcelo Lozada-Cassou, Jiang Yu
Rok vydání:	2007
Předmět:	Chemistry technology industry and agriculture Ionic bonding Thermodynamics Electrolyte Surfaces Coatings and Films Nanopore symbols.namesake Chemical physics Materials Chemistry symbols Physical and Theoretical Chemistry van der Waals force Absorption (chemistry)
Zdroj:	The Journal of Physical Chemistry B. 111:2033-2044
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp066946y
Popis:	Electrolytes confined by spherical, cylindrical, and slit-like charged nanopores are studied. Results for ionic distribution profiles, pressures of the confined fluid, and absorption isotherms are obtained through the hypernetted chain/mean spherical approximation (HNC/MSA) integral equations theory. In spherical and cylindrical geometries, an inward, non-monotonic behavior of the pressure is found as confinement increases, implying a negative compressibility. The pressure vs volume isotherms resemble liquid-vapor van der Waals-like phase transition diagrams. This effect is correlated with a charge separation inside a spherical pore previously reported (Phys. Rev. Lett., 79, 3656, 1997). Here, the mechanism of charge separation and negative compressibility are explored in detail. When compared with the slit-like pore pressure, important qualitative differences are found.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdf3d548600cf4cd2089959d28d08a8e https://doi.org/10.1021/jp066946y Zobrazit plný text záznamu