Entrapment of Organic Solutes by the Water Cage in the Nanochannel of MCM-41

Autor:	Kazumi Toriyama, Masaharu Okazaki
Rok vydání:	2005
Předmět:	Aqueous solution Chemistry Enthalpy Trapping Surfaces Coatings and Films Spin probe Solvent Adsorption Chemical physics Materials Chemistry Organic chemistry Molecule Physics::Chemical Physics Physical and Theoretical Chemistry Anisotropy
Zdroj:	The Journal of Physical Chemistry B. 109:20068-20071
ISSN:	1520-5207 1520-6106
Popis:	The effect of MCM-41 on the ESR spectrum of an aqueous spin probe solution was observed. The sharp ESR spectrum turns into a rather broad characteristic one leaving a sharper signal as the minor component, immediately after the addition of MCM-41 powder to the system. This observation indicates that MCM-41 traps the solute molecule into the nanochannel by letting the solvent water form a rather stable molecular cage, since the ESR line shape indicates that the nitroxide radical undergoes anisotropic rotation without being adsorbed on the wall. Thermodynamic parameters for this process are estimated from the temperature dependencies of the trapping efficiency. This process is explained in terms of the surface enthalpy of the liquid specifically intensified in the nanospace.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c31ce653d5b814bd55007bd4332c2583 https://doi.org/10.1021/jp055001y Zobrazit plný text záznamu