Micellar properties of cetyltrimethylammonium bromide in an acetonitrile–water mixture: Conductometric and fluorescence studies

Authors

  • Aleksandra Miroslav Janošević Ležaić Faculty of Pharmacy, University of Belgrade
  • Nataša Pejić Faculty of Pharmacy, University of Belgrade
  • Jelena Goronja Faculty of Pharmacy, University of Belgrade
  • Leposava Pavun Faculty of Pharmacy, University of Belgrade
  • Danijela Đikanović Faculty of Pharmacy, University of Belgrade
  • Anđelija Malenović Faculty of Pharmacy, University of Belgrade

DOI:

https://doi.org/10.20450/mjcce.2021.2394

Keywords:

acetonitrile/water mixtures, cetyltrimethylammonium bromide, conductometry, critical micellar concentration, steady-state fluorescence measurements

Abstract

The effect of acetonitrile (ACN) on the micellization of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), in aqueous solutions at different temperatures was studied. The critical micellar concentration (CMC) as well as the degree of counter ion dissociation (a) of CTAB in aqueous ACN mixtures (10-20 % v/v) at various temperatures (291.2-298.2 K) were determined by electrical conductivity measurements, while steady-state fluorescence measurements were used to determine several CMCs (for comparison) and a micellar aggregation number (Nagg) as well. At a fixed temperature, both an increase in CMC and a decrease in Nagg were observed for an increase in ACN in the solvent mixture. With a temperature increase, CMC values increased for 10 % (v/v) ACN, while for both 15 % and 20 % (v/v) ACN, CMC values were a minimum at T = 295.2 K with a temperature increase. In addition, some aspects related to the Krafft temperature behavior of CTAB in the examined micellar systems are discussed.

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Published

2021-11-26

How to Cite

Janošević Ležaić, A. M., Pejić, N., Goronja, J., Pavun, L., Đikanović, D., & Malenović, A. (2021). Micellar properties of cetyltrimethylammonium bromide in an acetonitrile–water mixture: Conductometric and fluorescence studies. Macedonian Journal of Chemistry and Chemical Engineering, 40(2), 277–287. https://doi.org/10.20450/mjcce.2021.2394

Issue

Vol. 40 No. 2 (2021)

Section

Physical Chemistry

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