Home Physical Sciences Effect of Tuned Head Polarity of Cetyl Trimethyl Ammonium Bromide on their Physicochemical Properties
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Effect of Tuned Head Polarity of Cetyl Trimethyl Ammonium Bromide on their Physicochemical Properties

  • Sachin S. Borse , Tryambakrao J. Patil and Mahendra S. Borse
Published/Copyright: May 1, 2013
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Abstract

To study the effect of tuned head group polarity on physicochemical properties of cetyl trimethyl ammonium bromide has been studied by conductance, surface tension and viscosity measurements. The critical micelle concentration was determined by conductance and surface tension measurements. Conductance measurement data was used to compute critical micelle concentration, average degree of micelle ionization and thermodynamic parameter of micellization. Surface tension data were further used to determine the surface excess concentration, minimum area per molecule at air-water interface. The decrease in effective Gibb's free energy with increase in head group polarity indicates that the micellization process is more favored over adsorption at the air-water interface. The intrinsic viscosity and hydration of micelle were observed to increase with increase in head group polarity and decrease with increase in temperature.

Kurzfassung

Für die Untersuchung des Einflusses vorgegebener Kopfgruppen auf die physikalisch-chemischen Eigenschaften von Cetyltrimethylammoniumbromid wurden die Leitfähigkeit, die Oberflächenspannung und die Viskosität gemessen. Mit Messungen der Leitfähigkeit und der Oberflächenspannung wurde die kritische Mizellbildungskonzentration ermittelt. Mit den Leitfähigkeitsmesswerten wurden die kritische Mizellbildungskonzentration, der mittlere Ionisierungsgrad der Mizellen und die thermodynamischen Parameter der Mizellenbildung berechnet. Die Daten der Oberflächenspannung wurden verwendet, um die Oberflächenüberschusskonzentration und den minimalen Platzbedarf pro Molekül an der Luft-Wasser-Grenzfläche zu berechnen. Die Abnahme der freien Gibbs-Energie mit der zunehmenden Kopfgruppenpolarität zeigt an, dass die Mizellenbildung gegenüber der Adsorption an der Luft-Wasser-Grenzfläche bevorzugt ist. Die intrinsische Viskosität und Hydratation der Mizelle nahmen zu mit steigender Kopfgruppenpolarität und fielen aber mit steigender Temperatur.


* Correspondence address Prof. Tryambakrao J. Patil, Department of Chemistry, Faculty of Science, Z. B. Patil College, Dhule, Dhule (424001), Maharashtra, India, Tel.: +91 94 23 91 60 46, E-Mail:

Dr. Tryambakrao Patil is Associate Professor working in Department of Chemistry of Z. B. Patil Arts and Science College, Dhule (Indai). His research interests are polymer chemistry and surfactants.

Sachin Borse is Assistant Professor working in Department of Chemistry of V. U. Patil Arts and Dr. B. S. Desale Science College, Sakri, District Dhule (India).

Dr. Mahendra Borse is Assistant Professor working in Department of Chemistry of Uttamrao Patil Arts and Science College, Dahivel, Dhule (India). He is visited as researcher in Research Laboratory of PANalytical Pvt Ltd, Almelo, Netherland. His research interests are Gemini surfactants.


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Received: 2013-08-11
Revised: 2013-10-11
Published Online: 2013-05-01
Published in Print: 2014-05-15

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