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Type: Artigo de periódico
Title: Structural modification influences the characteristics of Langmuir monolayers from aromatic carboxylic acids
Author: Dynarowicz-Latka, P
Kita, K
Milart, P
Dhanabalan, A
Cavalli, A
da Silva, DA
Oliveira, ON
Abstract: The molecular organization of purely aromatic, polyphenyl carboxylic acids, as Langmuir monolayers at the air/water interface, has been investigated by means of surface pressure and electric surface potential measurements upon film compression. The monolayer characteristics of the basic compound, a symmetrical triphenylbenzene (5 ' -phenyl-m-terphenyl) ring with a carboxylic group at the 4 position (namely 5 ' -phenyl-1,1 ': 3 ' ,1 ' -terphenyl-4carboxylic acid), are compared with those of its derivatives containing hydrophilic (nitro) or hydrophobic (phenyl) substituents. The nature of the substituent as well as its position (2 ' or 4 ') has a profound influence on the monolayer properties. The results are discussed in view of molecular orientation deduced from values of effective dipole moments. (C) 2001 Academic Press.
Subject: Langmuir monolayer
air/water interface
polyphenyl carboxylic acids
Country: EUA
Editor: Academic Press Inc
Citation: Journal Of Colloid And Interface Science. Academic Press Inc, v. 239, n. 1, n. 158, n. 167, 2001.
Rights: fechado
Identifier DOI: 10.1006/jcis.2001.7541
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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