Self aggregation of binary mixtures of sodium dodecyl sulfate and polyoxyethylene alkyl ethers in aqueous solution

• Published in: Colloid and polymer science 2005-05, Vol.283 (8), p.845-853
• Main Authors: GLENN, Karen, VAN BOMMEL, Andrew, BHATTACHARYA, Subhash C, PALEPU, Rama M
• Format: Article
• Language: English
• Subjects: Agglomeration; Applied sciences; Aqueous solutions; Chains; Chemistry; Ethers; Exact sciences and technology; General and physical chemistry; Interaction parameters; Micelles; Nonionic; Organic polymers; Physicochemistry of polymers; Properties and characterization; Sodium; Solution and gel properties; Sulfates; Surface physical chemistry; Surface-active agents: properties
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-004-1200-6

The mixed micelles of sodium dodecyl sulphate (SDS) with Brij35 and Brij 97 were studied separately by fluorescence measurement using pyrene as fluorescent probe. In the range of 0-1.0 mole fraction (X) of added SDS to Brij solutions, the cmc value of the mixed micelles varies from 0.085 to 8 mmol with Brij 35 and 0.04 to 8 mmol with Brij 97. The aggregation number also changes. A measure of the stability of mixed micelles is also presented. The interaction parameter β^sub 12^ and the chain-chain contribution parameter (B^sub 1^) are extracted from the analysis of the results. This parameter B^sub 1^ is related to the standard free energy change associated with the introduction of one ionic species into a nonionic micelle coupled with the release of one nonionic species from the micelle. The clouding behaviour of Brij 97 in the presence of SDS was investigated and the associated thermodynamic parameters of clouding were generated and discussed.[PUBLICATION ABSTRACT]