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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 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
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