Effects of additives on the cloud points of selected nonionic linear ethoxylated alcohol surfactants

Li, Jing-Liang, Bai, Dong-Shun and Chen, Bing-Hung 2009, Effects of additives on the cloud points of selected nonionic linear ethoxylated alcohol surfactants, Colloids and surfaces A : physicochemical and engineering, vol. 346, no. 1-3, pp. 237-243, doi: 10.1016/j.colsurfa.2009.06.020.

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Title Effects of additives on the cloud points of selected nonionic linear ethoxylated alcohol surfactants
Author(s) Li, Jing-LiangORCID iD for Li, Jing-Liang orcid.org/0000-0003-0709-2246
Bai, Dong-Shun
Chen, Bing-Hung
Journal name Colloids and surfaces A : physicochemical and engineering
Volume number 346
Issue number 1-3
Start page 237
End page 243
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2009-08-20
ISSN 0927-7757
Keyword(s) cloud point
nonionic surfactant
ionic surfactant
Summary Effects of various additives including inorganic salts, nonionic and ionic surfactants, water-soluble polymers and alcohols on the cloud points of three linear nonionic surfactants, Tergitol 15-S-7, Tergitol 15-S-9 and Neodol 25-7, were investigated. These surfactants are readily biodegradable and either linear primary or secondary ethoxylated alcohols. Cloud points of these surfactants were functions of their concentrations and concentrations of additives. The cloud points of nonionic surfactant mixtures lay in between the cloud points of individual component surfactants. Presence of two ionic surfactants, sodium dodecyl sulfate (SDS) and cetyl trimethyl ammonium bromide (CTAB), increased the cloud point of 1 wt% Tergitol 15-S-7 micellar solution dramatically when concentrations of ionic surfactants approaching their critical micelle concentration. Addition of water-soluble polymers decreased the cloud point, while addition of inorganic salts can either increase or decrease the cloud points. However, the effect of an alcohol additive on cloud point was dependent on its chain length or its water solubility. Interestingly, synergistic effects between sulfate or phosphate and pentanol on depression of cloud points of Tergitol 15-S-9 were discovered. A linear model predicting cloud points of Tergitol 15-S-X (X = 7, 9 and 12) surfactants and Neodol 25-X (X = 7, 9 and 12) surfactants were proposed with a correlation to logarithm of their ethylene oxide numbers.
Language eng
DOI 10.1016/j.colsurfa.2009.06.020
Field of Research 090703 Environmental Technologies
090409 Wastewater Treatment Processes
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30039314

Document type: Journal Article
Collections: Centre for Material and Fibre Innovation
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