A new series of amphiphilic molecules forming stable z-type (polar) Langmuir-Blodgett films

Journal Article · Wed Mar 28 00:00:00 EST 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00163a005· OSTI ID:6379345

Popovitz-Biro, R; Hill, K; Shavit, E; Hung, D J; Lahav, M; Leiserowitz, L; Sagiv, J ^[1]; Hsiung, H; Meredith, G R; Vanherzeele, H ^[2]

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1. Weizmann Institute of Science, Rehovot (Israel)
2. E.I. Du Pont de Nemours and Co., Wilmington, DE (USA)

A new series of amphiphilic molecules bearing two amide groups along the hydrocarbon chain form head-to-tail Z-type (polar) multilayers by the Langmuir-Blodgett (LB) technique, in contrast with the common amphiphiles that tend to deposit in the head-to-head, tail-to-tail Y-type fashion. Molecules with one amide group along the chain form Y-type or Z-type structures, depending on the location of the amide along the chain. p-Nitroaniline or merocyanine groups could be aligned in a polar sense, by attaching them covalently to such amphiphiles, to yield multilayers displaying second-harmonic generation (SHG). These films were characterized by ellipsometric, X-ray diffraction, IR, UV, and SHG measurements. The Z-type deposition correlates with the observed low water contact angles of the films, indicating formation of porous structures in which water may penetrate.

• OSTI ID: 6379345
• Journal Information: Journal of the American Chemical Society; (USA), Vol. 112:7; ISSN 0002-7863
• Country of Publication: United States
• Language: English

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400201* - Chemical & Physicochemical Properties