DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/794

Title: Study of mixed system in monolayers and multilayers transferred by Langmuir–Blodgett technique
Authors: SHEMBEKAR, VISHAKHA R
DHANABALAN, A
TALWAR, SS
CONTRACTOR, AQ
Keywords: molecular dynamics
multilayers
ultraviolet spectroscopy
phase separation
Issue Date: 1999
Publisher: Elsevier
Citation: Thin Solid Films 342(1-2), 270-276
Abstract: Mixtures in different molar proportions of azo acid, (6Az10COOH, 6A10) and arachidic acid (AA) when spread on an aqueous subphase containing CdCl2, were found to form inhomogeneous monolayers on the water surface. This inhomogeneity in the monolayers at the air–water interface as well as in the transferred films was studied by using π–A isotherms, XRD and UV–visible spectroscopy. π–A isotherm studies of the monolayers and XRD, UV–visible spectroscopy of Langmuir–Blodgett (LB) multilayers essentially indicated that there was microphase separation. Domains of azo acid and arachidic acid were found. H-aggregate formation of azo acid was observed in pure azo acid as well as in the azo acid composite films. Composite LB films consist of three different phases of molecular organizates and one of these involves molecular arrangement where domains of azo acid and arachidic acid straddle each other. Studies showed that strong molecular interaction in the successive layers in the mixed system led to this characteristic molecular packing in the system. The mean molecular area, ΔGexπ and collapse pressure also showed that the acids were immiscible, thus indirectly suggesting the presence of domains in the system.
URI: http://dx.doi.org/10.1016/S0040-6090(98)01449-7
http://hdl.handle.net/10054/794
http://dspace.library.iitb.ac.in/xmlui/handle/10054/794
ISSN: 0040-6090
Appears in Collections:Article

Files in This Item:

File Description SizeFormat
5548-1.pdf333.09 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback