Gel network amplifies Nano-Scale adsorption at Solid/Liquid interface to Sub-Millimeter-Scale

[Display omitted] We have proposed a spreading-flow model of the solvent movement in a gel, which states that the solvent flows along the gel network segment much easier than in any other direction. An excess amount of the solvent component adsorbed on a flat solid surface in a gel will be transferr...

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Bibliographic Details
Published in:	Journal of colloid and interface science Vol. 626; pp. 276 - 282
Main Authors:	Aizawa, Hiroki, Kimura, Sora, Abe, Shunsei, Sano, Masahito
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 15-11-2022
Subjects:	Adsorption Confocal Raman microscopy Gel network Hydroxystearic acid Solvent flow Gel network Solvent flow Adsorption Confocal Raman microscopy Hydroxystearic acid
Online Access:	Get full text
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Summary:	[Display omitted] We have proposed a spreading-flow model of the solvent movement in a gel, which states that the solvent flows along the gel network segment much easier than in any other direction. An excess amount of the solvent component adsorbed on a flat solid surface in a gel will be transferred over the macroscopic gel network by the spreading-flow. Then, by measuring the concentration distribution of each solvent near the solid surface at the sub-millimeter scale, it should be possible to evaluate adsorption occurring on the nanometer scale. Confocal Raman microscopy was employed to map the concentration distributions of mixed solvents of p-xylene, mesitylene, and octanenitrile gelled by 12-hydroxystearic acid near the atomically flat mica surface. The measured concentration profiles were analyzed by the spreading-flow theory to construct adsorption isotherms. Nearly all isotherms follow power laws with similar exponents, which is consistent with the van der Waals multilayer adsorption with weak adsorbate-adsorbent interactions. The present study demonstrates the concept of gel network amplification and its usefulness for probing nano-phenomena using macro-technology.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-9797 1095-7103
DOI:	10.1016/j.jcis.2022.06.127