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The effects of salts and ionic surfactants on the micellar structure of tri-block copolymer PEO-PPO-PEO in aqueous solution

Bharatiya, Bhavesh; Ghosh, Goutam; Bahadur, P.; Jitendrakumar, Mata

Description

The micelles of two poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers, P123 and F127 (same mol wt of PPO but different % PEO) in aqueous solution in the absence and presence of salts as well as ionic surfactants were mainly examined by dynamic light scattering (DLS). The study is further supported by cloud point and viscosity measurements. The change in cloud point (CP), as well as the size of micelles in aqueous solution in presence of salts obeys...[Show more]

dc.contributor.authorBharatiya, Bhavesh
dc.contributor.authorGhosh, Goutam
dc.contributor.authorBahadur, P.
dc.contributor.authorJitendrakumar, Mata
dc.date.accessioned2015-12-10T22:23:35Z
dc.identifier.issn0193-2691
dc.identifier.urihttp://hdl.handle.net/1885/52858
dc.description.abstractThe micelles of two poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers, P123 and F127 (same mol wt of PPO but different % PEO) in aqueous solution in the absence and presence of salts as well as ionic surfactants were mainly examined by dynamic light scattering (DLS). The study is further supported by cloud point and viscosity measurements. The change in cloud point (CP), as well as the size of micelles in aqueous solution in presence of salts obeys the Hofmeister lyotropic series. Addition of both cationic cetylpyridinium chloride (CPC) and anionic sodium dodecylsulfate (SDS) surfactants in the aqueous solution of P123 show initial decrease of micellar size from 20 nm to nearly 7 nm and then increasing with a double relaxation mode, further in the presence of NaCl this double relaxation mode vanishes. The effect of surfactant on F127, which has much bigger hydrophilic part is different than P123 and have no double relaxation. The relaxation time distributions is obtained using the Laplace inversion routine REPES. Two relaxation modes for P123 are explained on the bases of Pluronic rich mixed micelles containing ionic surfactants and the other smaller, predominantly surfactant rich micelles domains.
dc.publisherMarcel Dekker Inc.
dc.sourceJournal of Dispersion Science and Technology
dc.subjectKeywords: Agglomeration; Composition effects; Dynamic light scattering; Laplace equation; Micelles; Polyethylene oxides; Polypropylene oxides; Salts; Surface active agents; Cloud point; Ionic surfactant; Micellar structure; Block copolymers; Agglomeration; Block co Aggregation; Block copolymers; Dynamic light scattering; Surfactant pluronic interaction
dc.titleThe effects of salts and ionic surfactants on the micellar structure of tri-block copolymer PEO-PPO-PEO in aqueous solution
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume29
dc.date.issued2008
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.ariespublicationu4217927xPUB257
local.type.statusPublished Version
local.contributor.affiliationBharatiya, Bhavesh, Veer Narmad South Gujarat University
local.contributor.affiliationGhosh, Goutam, IUC-DAEF
local.contributor.affiliationBahadur, P, Veer Narmad South Gujarat University
local.contributor.affiliationJitendrakumar, Mata, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage696
local.bibliographicCitation.lastpage701
local.identifier.doi10.1080/01932690701751876
dc.date.updated2015-12-09T09:09:18Z
local.identifier.scopusID2-s2.0-42549152129
CollectionsANU Research Publications

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