Please use this identifier to cite or link to this item: http://dl.umsu.ac.ir/handle/10722/90903
Title: Solubility of sodium soaps in aqueous salt solutions
Authors: Lin, B;McCormick, AV;Davis, HT;Strey, R
subject: Krafft Point;Phase Behavior;Sodium Soaps;Solubility;Tetraalkylammonium Bromides
Year: 2005
Publisher: Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/jcis
Description: The solubility of sodium soaps in dilute aqueous salt solutions has been systematically investigated by direct visual phase behavior observations. The added electrolytes, including simple inorganic salts and bulky organic salts, influence the solubility of sodium soaps in water, as represented by the varied soap Krafft point. Two inorganic salts, sodium chloride and sodium perchlorate, demonstrate a "salting-out" property. On the other hand, tetraalkylammonium bromides show an excellent ability to depress the soap Krafft point and enhance the soap solubility in water. With increasing the tetraalkylammonium ionic size, the degree of "salting-in" of soaps in water increases. However, solubility of pure tetraalkylammonium bromide in water decreases as the length of the alkyl chains increases. Furthermore, in the ternary water-tetrapentylammonium bromide (TPeAB)-sodium myristate (NaMy) system, we observed an upper cloud point phenomenon, which greatly shrinks the 1-phase micellar solution region in the phase diagram. This miscibility gap, together with the organic salt solubility limitation, restricts the use of tetraalkylammonium bromides with alkyl chains longer than 4 carbon atoms as effective soap solubility enhancement electrolytes. We also found that for sodium soap with a longer hydrocarbon chain, more tetrabutylammonium salt is required to reduce the soap Krafft point to room temperature. © 2005 Elsevier Inc. All rights reserved.
URI: http://www.scopus.com/mlt/select.url?eid=2-s2.0-26444586720&selection=ref&src=s&origin=recordpage
http://hub.hku.hk/handle/10722/90903
Standard no: Journal of Colloid and Interface Science, 2005, v. 291 n. 2, p. 543-549
10.1016/j.jcis.2005.05.036
549
WOS:000232815500027
0021-9797
2
eid_2-s2.0-26444586720
543
291
Appears in Collections:Department of Anatomy

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