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Mixed Micelles Containing Sodium Laurate: Effect of Chain Length, Polar Head Group, and Added Salt

Natriumlaurat enthaltende Mischmizellen: Einfluss der Kettenlänge, der polaren Kopfgruppe und des zugegebenen Salzes
Rie Kakehashi, Motohiro Shizuma and Shingo Yamamura

Abstract

We studied the mixing behavior of binary mixtures of alkylglycosides (CnGly); i.e. n-Octyl β-D-glucopyranoside, n-Decyl β-D-glucopyranoside and n-Decyl β-D-maltoside in combination with sodium laurate (NaL), and N,N-dimethyldodecylamine oxide in combination with NaL. The critical micelle concentration (CMC) data were obtained as functions of the composition based on equilibrium surface tension measurements. The cmc values with and without the addition of salt systems were then analyzed according to the regular solution model developed by Rubingh for mixed micelles. For the added salt systems, we applied Maeda's formulation for ionic/nonionic mixed micelles. For NaL/CnGly mixed systems, an increase in the hydrophilicity of the polar head group of CnGly resulted in a strong interaction between NaL and CnGly. In addition, introducing ionic species to the added salt systems stabilized the nonionic micelles.

Kurzfassung

Wir untersuchten das Mischungverhalten binärer Mischungen aus Alkylpolyglycosiden (CnGly), d.h. n-Octyl-β-D-glucopyranosid, n-Decyl-β-D-glucopyranosid and n-Decyl-β-D-maltosid in Verbindung mit Natriumlaurat (NaL) und N,N-Dimethyldodecylaminoxid in Verbindung mit Natriumlaurat (NaL). Die kritischen Mizellbildungskonzentrationen (CMC) wurden mit Messungen der Gleichgewichtsoberflächenspannung in Abhängigkeit von der Zusammensetzung erhalten. Die kritischen Mizellbildungskonzentrationen in Systemem mit und ohne Salzzugabe wurden dann mit Regular-Solution-Modell, das Rubingh für Mischmizellen entwickelt hat, analysiert. Für Systeme mit Salzzusatz wandten wir die Maeda-Beziehung für ionische/nichtionische Mischmizellen an. Für die Systeme NaL/CnGly resultierte die Zunahme der Hydrophilie der polaren Kopfgruppe des CnGly in einer starken Wechselwirkung zwischen NaL und CnGly. Zusätzlich konnte die Zugabe von ionischen Verbindungen zu den Salzsystemen die nichtionischen Mizellen stabilisieren.


Dr. Rie Kakehashi, Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553, Japan, Tel.: +81-6-6963-8023, Fax: +81-6-6963-8040, E-Mail:

Dr. Rie Kakehashi (1966) received her PhD at Kyushu University. She is a research scientist of the Organic Materials Research Division, OMTRI.

Dr. Motohiro Shizuma (1965) received his PhD at Osaka University. He is a research scientist of the Biomaterial and Commodity Chemicals Research Division, OMTRI.

Dr. Shingo Yamamura (1956) received his PhD at Osaka University. He is a research scientist of the Organic Materials Research Division, OMTRI.


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Received: 2012-07-09
Revised: 2012-08-21
Published Online: 2013-04-05
Published in Print: 2012-11-01

© 2012, Carl Hanser Publisher, Munich