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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
Received:
16 July 2016/Accepted: 24 October 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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*Corresponding
author; email: noorrehman@sbbu.edu.pk
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