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Electric field induced cloudy-clear transitions in micellar solutions of a block copolymeric amphiphile

DSpace at IIT Bombay

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Title Electric field induced cloudy-clear transitions in micellar solutions of a block copolymeric amphiphile
 
Creator RAUT, JS
DUGGAL, C
VENKATARAGHAVAN, R
GHOSHDASTIDAR, S
FRANKLIN, DC
ROY, A
NAIK, VM
 
Subject THIN-FILMS
TRIBLOCK COPOLYMERS
DIBLOCK COPOLYMER
INDUCED ALIGNMENT
DOMAIN ALIGNMENT
MICROSTRUCTURE
INSTABILITIES
SHEAR
 
Description We report observations of cloudy-clear transitions, triggered by electric fields, in micellar solutions of a poly(oxy ethylene/propylene)-poly(dimethylsiloxane) based triblock amphiphile dissolved in silicone oil (DC245). Initial studies showed complete clarification of a cloudy 2% solution at ambient temperature when subjected to a uniform electric field of similar to 5 kV cm(-1). Static Light Scattering measurements showed that the clarification was associated with a significant reduction in the size of the micellar aggregate from ca. 200 nm to 50 nm. Field strength studies at varying temperatures established the potency of the effect at 1 kV cm(-1) field equivalent to a 1 K decrease in temperature. The observed effect was qualitatively different from the electric field induced macroscopic pattern formations, or self assembled domain rotations or mesogen alignment phenomena; and quantitatively far more impactful than the minor shifts in phase boundaries reported earlier. Although the mechanistic underpinning of the observed field effect has yet to be established, the optical switchability of the solutions could be exploited for various electro-optical applications such as displays, and optical filters. The work also opens up the possibilities of using electric fields for manipulating micellar solubilization or creating tunable templates for nano-material synthesis.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-10-15T11:59:49Z
2014-10-15T11:59:49Z
2013
 
Type Article
 
Identifier RSC ADVANCES, 3(30)12341-12348
http://dx.doi.org/10.1039/c3ra40712h
http://dspace.library.iitb.ac.in/jspui/handle/100/14849
 
Language en