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Micellar Characteristics and Surface Properties of Some Sulfobetaine Surfactants

  • N. Singh and K. K. Ghosh
Published/Copyright: April 11, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 48 Issue 2

Abstract

The micellar and interfacial properties of three sulfobetaine surfactants of the type CnH2n+1N+Me2(CH2)3SO3− (n = 10; SB3-10 n = 12; SB3-12, n = 16; SB3-16) have been studied by conductometry and surface tension measurements. The critical micellar concentration (CMC), surface excess concentration (Γmax), minimum surface area per molecule of surfactant (Amin), Gibbs free energy of micellization (ΔGom), Gibbs energy of transfer (ΔGotrans), the surface pressure at CMC (πCMC) and the Gibbs energy of adsorption (ΔGoads) of these surfactants have also been determined. Effect of formamide has been studied at higher temperature conductometrically. Results show that alkyl chain length and the amount of solvent composition influences micellization and surface properties of sulfobetaines. Increment in the CMC, ΔGom and ΔGotrans, can be accounted for changes in the polarity of the bulk phase. Γmax, and πcmc decreases where as Amin increases with increase in the organic solvent. It was also observed that micellization in water-formamide mixture was even slower than in the case of ethylene glycol.

Kurzfassung

Die Eigenschaften von Mizellen und Grenzflächen von drei Sulfobetainen des Typs CnH2n+1N+Me2(CH2)3SO3− (n = 10; SB3-10, n = 12; SB3-12, n = 16; SB3-16) wurden mittels Messungen der Leitfähigkeit und der Grenzflächenspannung bestimmt. Für diese Tenside wurden die folgenden thermodynamischen Größen bestimmt: die kritische Mizellbildungkonzentration (CMC), die Oberflächenüberschusskonzentration (Γmax), der minimale Platzbedarf eines Tensidmoleküls an der Grenzfläche (Amin), die freie Gibbs-Energie der Mizellenbildung (ΔGom), die Gibbs-Energie des Transfers (ΔGotrans), der Oberflächendruck bei der CMC (πCMC) und die Gibbs-Energie der Adsorption (ΔGoads). Der Einfluss von Formamid wurde bei höheren Temperaturen mittels Messung der Leitfähigkeit bestimmt. Die Resultate zeigen, dass die Alkylkettenlänge, die Menge und Zusammensetzung des Lösemittels die Mizellenbildung und die Oberflächeneigenschaften der Sulfobetaine beeinflussen. Die Zunahme der Größen CMC, ΔGom and ΔGotrans kann als Änderungen der Polarität in der Bulkphase in Betracht gezogen werden. Γmax und πCMC nehmen ab und Amin zu bei Zunahme im Lösemittel. Es konnte ebenfalls beobachtet werden, dass die Mizellenbildung in der Wasser-Formamid-Mischung langsamer war als in Ethylenglykol.

Key words:: Zwitterionic surfactants; micellization; solvent effect; formamide; surface properties
Stichwörter:: Zwitterionische Tenside; Mizellenbildung; Lösemitteleffekt; Formamid; Oberflächeneigenschaften
∗ Prof. Kallol K. Ghosh, School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur (C.G), 492010, India, Tel.: +91-771-2263146 (O), 2262249 (R), Fax: 491-7671-2262583. E-Mail:

Dr. Kallol K. Ghosh Professor of Physical Chemistry at School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, India since 1998. He had been a INSA/JSPS fellow at Seikei University, Tokyo, Japan and James Chair visiting fellow at St. Francis Xavier University, Antigonish, Canada. He has published 92 research papers. His research focused on micellar catalysis, reaction mechanism, hydroxamic acid and detoxifications.

Namrata Singh has completed her M.Sc. (Chemistry) and is presently working as Research Scholar in School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, India. Her research interest is to study the physico-chemical properties of novel surfactants.

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Received: 2010-06-24
Published Online: 2013-04-11
Published in Print: 2011-03-01

© 2011, Carl Hanser Publisher, Munich

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  5. Application
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https://doi.org/10.3139/113.110118
Keywords for this article
Zwitterionic surfactants; micellization; solvent effect; formamide; surface properties

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Alkyl Polyglycoside/1-Naphthol Formulations: A Case Study of Surfactant Enhanced Oil Recovery
  7. 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium Perchlorate as a New Indicator for Anionic Surface Active Agents Determination
  8. Environmental Chemistry
  9. Kinetics and Adsorption Isotherms for the Removal of Tartrazine from Aqueous Solution by Coal Ash
  10. Removal of Triphenylmethane Dye from Aqueous Solution by Carbonaceous Adsorbent
  11. European Detergents Conference
  12. Nonequilibrium Association of Oppositely Charged Macromolecules and Amphiphiles
  13. Novel Surfactants
  14. Syntheses and Properties of New Double-tail Trisiloxane Surfactants with Both Hydrolysis Resistance and High Spreading Ability
  15. Synthesis of Some Novel Sulfonamide Derivatives and Investigating their Biocidal Activity in Cooling Towers
  16. Physical Chemistry
  17. Micellar Characteristics and Surface Properties of Some Sulfobetaine Surfactants
  18. Viscosity and Percolative Phenomena in AOT based Microemulsions
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