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Hygroscopic Growth of Self-Assembled Layered Surfactant Molecules at the Interface between Air and Organic salts

Published online by Cambridge University Press:  10 February 2011

Yongsoon Shin ,
Li-Qiong Wang ,
Glen E. Fryxell  and
Greg J. Exarhos
Yongsoon Shin
Affiliation:
Pacific Northwest National Laboratory, Richalnd, WA 99352
Li-Qiong Wang
Affiliation:
Pacific Northwest National Laboratory, Richalnd, WA 99352
Glen E. Fryxell
Affiliation:
Pacific Northwest National Laboratory, Richalnd, WA 99352
Greg J. Exarhos
Affiliation:
Pacific Northwest National Laboratory, Richalnd, WA 99352
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Abstract

In this paper, we report a self-assembly of surfactant molecules at the interface of air/hygroscopic quaternary ammonium salts such as tetrabutylammonium acetate (TBAAc), tetrabutylammonium bromide (TBAB), and tetrabutylammonium nitrate (TBAN), where they show different hygroscopicity, TBAAc > TBAB > TBAN. Homogeneously dissolved surfactants rearrange themselves when they contact air due to high moisture adsorption behavior of such organic salts. Highly ordered lamellar phases with different lattice spacings have been observed when surfactants with long alkyl chains were used. Alkylammonium halides form monolayers, while neutral alkylamines forms bilayers based upon basal spacings of their X-ray diffraction patterns. The change in basal spacings in lamellar patterns, the alkyl chain conformation of surfactants, and Hbonding property of neutral amine surfactants are discussed in detail.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P6.14
Copyright
Copyright © Materials Research Society 2003

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