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The interplay of hydrophobic and electrostatic effects in the surfactant-induced aggregation/deaggregation of chlorin p(6)

DSpace at IIT Bombay

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Title The interplay of hydrophobic and electrostatic effects in the surfactant-induced aggregation/deaggregation of chlorin p(6)
 
Creator MISHRA, PP
BHATNAGAR, J
DATTA, A
 
Subject resonance light-scattering
sub-5-fs spectroscopy
porphyrin
aggregation
fluorescence
micelles
ph
assemblies
liposomes
oxygen
 
Description The aggregation/deaggregation of chlorin p(6) with the surfactants CTAB, SDS, and TX 100 have been studied by using absorption, fluorescence, and light scattering techniques. The ionic surfactants are found to cause aggregation of fluorophore at submicellar concentrations. The aggregates dissolve at higher surfactant concentrations to yield micellized monomers. This is rationalized by the interplay of electrostatic and hydrophobic effects. A prominent pH effect is observed in the ionic surfactant induced aggregation process as the charge on the fluorophore is controlled by the pH of the medium. Interestingly, the neutral TX-100 also induces aggregation of chlorin p(6) at low concentrations, indicating that hydrophobic effects by themselves can cause aggregation unless there is a hindrance by repulsive electrostatic effects.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-15T01:56:08Z
2011-12-26T12:49:10Z
2011-12-27T05:34:57Z
2011-07-15T01:56:08Z
2011-12-26T12:49:10Z
2011-12-27T05:34:57Z
2005
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY B, 109(51), 24225-24230
1520-6106
http://dx.doi.org/10.1021/jp052682o
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4120
http://hdl.handle.net/10054/4120
 
Language en