Stress-strain relation in the collapse of Langmuir monolayer of a dimer of disk shaped moiety

Kumar, Bharat; Suresh, K.A.; Gupta, Satyam Kumar; Kumar, Sandeep

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3985

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DC Field	Value	Language
dc.contributor.author	Kumar, Bharat	-
dc.contributor.author	Suresh, K.A.	-
dc.contributor.author	Gupta, Satyam Kumar	-
dc.contributor.author	Kumar, Sandeep	-
dc.date.accessioned	2011-04-08T06:13:48Z	-
dc.date.available	2011-04-08T06:13:48Z	-
dc.date.issued	2010-07-28	-
dc.identifier.citation	Journal of Chemical Physics, 2010, Vol. 133, 044701	en
dc.identifier.issn	1089-7690-(Online)	-
dc.identifier.issn	0021-9606	-
dc.identifier.uri	http://hdl.handle.net/2289/3985	-
dc.description	Open Access.	en
dc.description.abstract	Langmuir monolayer of a novel molecule containing dimer of disk shaped moiety, viz., terephtalic acid bis-[6-(3,6,7,10,11-pentahexyloxy-triphenylen-2-yloxyl)-hexyl] ester (tp-dimer), was studied at air-water interface. The monolayer of the tp-dimer at air-water interface exhibited the coexistence of condensed and gas phases at large area per. molecule which on compression transformed to a uniform condensed phase at lower area per molecule (1.80 nm(2)) and then collapsed at 1.67 nm(2). The monolayer film transferred by Langmuir-Blodgett technique onto a hydrophilic silicon substrate was studied using an atomic force microscope. The topography image showed the film to be of height of about 1.5 nm corresponding to the edge-on configuration of the triphenylene moieties. We have studied the collapse of monolayer at air-water interface as a function of compression rate and temperature. We find that the collapse pressure increased with increase in the compression rate. The surface pressure of the monolayer is considered as stress and compression as strain. The strain rate is related to the collapse pressure by a power law similar to that found in the dendrimers. Our studies on the effect of temperature on the collapse pressure of tp-dimer monolayer showed that the collapse pressure decreased with increase in temperature. We have considered the Arrhenius temperature dependence of the strain rate and calculated the activation energy for the collapse of monolayer. Our analysis of the relative area loss as a function of time in the collapse region suggests that the monolayer collapses by the formation of nuclei of three-dimensional crystallites.	en
dc.language.iso	en	en
dc.publisher	American Institute of Physics	en
dc.relation.uri	http://dx.doi.org/10.1063/1.3465575	en
dc.rights	2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics	en
dc.subject	air-water-interface	en
dc.subject	Blodgett-films	en
dc.subject	microscopy- growth	en
dc.subject	molecules	en
dc.title	Stress-strain relation in the collapse of Langmuir monolayer of a dimer of disk shaped moiety	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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