Sains Malaysiana 46(5)(2017): 733–741

http://dx.doi.org/10.17576/jsm-2017-4605-08

 

Effect of Electrolyte (NaCl) and Temperature on the Mechanism of Cetyl Trimethylammonium Bromide Micelles

(Kesan Elektrolit (NaCl) dan Suhu terhadap Mekanisme Setil Trimetilammonium

Bromida Misel)

 

ZIA UL HAQ1, NOOR REHMAN2*, FARMAN ALI2, NASIR MEHMOOD KHAN2

& HIDAYAT ULLAH3

 

1Department of Chemistry, Gomal University, D.I. Khan, Pakistan

 

2Department of Chemistry, Shaheed BB University, 18000, Sheringal, Dir (Upper), Pakistan

 

3Institute of Chemical Sciences, University of Peshawar, 25000, Pakistan

 

Diserahkan: 16 Julai 2016/Diterima: 24 Oktober 2016

 

 

ABSTRACT

In the last few decades, surfactants and electrolytes interaction has gained considerable attention of researchers due to their industrial and domestic applications. In this work, the effects of electrolyte (NaCl) on the critical micelle concentration (CMC) of the cationic surfactant cetyltrymethyl ammonium bromide (CTAB) at different temperatures were investigated through different techniques such as conductometry, surface tensiometer and viscosimeter. The results showed that the values of CMC of CTAB decreased with the increase in temperature as well as with the addition of NaCl. The value of CMC for pure CTAB was calculated 0.98M at 303K, which was observed to decrease as temperature increased and got value of 0.95M at 318K. Moreover the addition of electrolyte NaCl into the surfactant lead to lowering of the CMC and obtained value of 0.90M at 3M of NaCl, indicating significant electrostatic interactions between surfactant and electrolyte. Moreover the degree of ionization(α) calculated for pure cationic surfactant CTAB was 0.219, which tends to increase with the addition of electrolyte, while that of counter ion binding values (β) was observed to decrease from 0.780 to 0.201. Furthermore, the conductivity of charged micelle of surfactant and free ions of electrolyte contributed to electric conductivity of aqueous micellar solution of surfactant. The results can be helpful to develop better understanding about interaction between electrolyte and surfactant.

 

Keywords: Electrical conductance; electrolyte NaCl; surface tension; surfactant CTAB; viscosity

ABSTRAK

Beberapa dekad kebelakangan ini, surfaktans dan interaksi elektrolit telah mendapat perhatian para penyelidik kerana kegunaannya dalam perindustrian dan domestik. Dalam kertas ini, kesan elektrolit (NaCl) ke atas kepekatan kritikal misel (CMC) of kationik surfaktans setiltrimetil ammonium bromida (CTAB) pada suhu yang berbeza telah dikaji melalui teknik yang berbeza seperti konduktometri, permukaan tensiometer dan meter kelikatan. Hasil kajian menunjukkan bahawa nilai CMC untuk CTAB berkurang dengan peningkatan suhu serta penambahan NaCl. Nilai CMC untuk CTAB tulen ialah 0.98M pada 303K dan diperhatikan menurun apabila suhu meningkat dan memperoleh nilai 0.95M pada 318K. Selain itu, penambahan elektrolit NaCl ke dalam surfaktans membawa kepada penurunan CMC ini dan memperoleh nilai 0.90M pada 3M NaCl yang menunjukkan interaksi elektrostatik yang penting antara surfaktans dan elektrolit. Tambahan pula, darjah pengionan(α) yang dikira untuk surfaktans kationik tulen CTAB ialah 0.219, yang cenderung untuk meningkat dengan penambahan elektrolit, manakala perbandingan nilai ikatan ion (β) diperhatikan menurun daripada 0.780 untuk 0.201. Seterusnya, konduktiviti misel bercaj surfaktans dan elektrolit ion bebas menyumbang kepada kekonduksian elektrik larutan akueus misel surfaktans. Keputusan kajian diharap dapat membantu meningkatkan pemahaman interaksi antara elektrolit dan surfaktans.

 

Kata kunci: Elektrolit NaCl; CTAB surfaktans; kekonduksian elektrik; kelikatan; ketegangan permukaan

 

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*Pengarang untuk surat-menyurat; email: noorrehman@sbbu.edu.pk

 

 

 

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