Aggregation Behavior of Sodium Dodecyl Sulfate and Cetyltrimethylammonium Bromide Mixtures in Aqueous/Chitosan Solution at Various Temperatures: An Experimental and Theoretical Approach

Abstract

A conductometric study of the mixed micellization behavior between cetyltrimethylammonium bromide (CTAB, a cationic surfactant) and sodium dodecyl sulfate (SDS, an anionic surfactant) was carried out in the absence/presence of various percentages of chitosan in the temperature range of 298.15–318.15 K. The deviations of critical micelle concentration (cmc) from the ideal values indicate the interaction between CTAB and SDS. The micellar mole fraction values according to different proposed models X1Rub (Rubingh), X1M (Motomura), X1Rod (Rodenas), and X1id (ideal mole fraction) were estimated and the results obtained reveal the high contribution of CTAB in the mixed micellization, which enhances with the increase of the mole fraction of CTAB. The negative magnitudes of normalΔGm0 indicate the spontaneous formation of mixed micelles between CTAB and SDS. The values of activity coefficients (f1 and f2) were less than unity and the values of the interaction parameter (β) are negative in all cases, which indicate the attractive interaction between CTAB and SDS. The negative values of excess free energy of micellization (ΔGex) signify the stability of the mixed micelles. The negative values of normalΔHm0 in the chitosan systems indicate that micellization is exothermic. The values of normalΔSm0 were found to be positive in all cases.

Influence of Different Additives on the Interaction of Quinolone Antibiotic Drug with Surfactant: Conductivity and Cloud Point Measurement Study

“…The standard enthalpy change of micellization, of TTAB/TTAB+CFH can be evaluated from the following relation (Hoque et al, ; Mahbub et al, , , , , ): …”

“…The conductivity meter was calibrated each time prior to its application through KCl having certain concentration. The conductivity measurement of all solutions was performed following the procedure reported in the literature (Amin et al, ; Hoque et al, ; Mahbub et al, , , , ). Stock solutions (25 mmol kg −1 ) of TTAB in aqueous/electrolyte medium had been constructed in the presence of CFH and inchmeal added to the corresponding solvent at a certain temperature.…”

Effects of temperature and polyols on the ciprofloxacin hydrochloride-mediated micellization of sodium dodecyl sulfate

“…Conductivity measurements were performed to elucidate the interactions between SDS (shown in Scheme 1) and CFH (shown in Scheme 2) in the presence/absence of polyols according to a process mentioned in the literature. [36][37][38][39][40] The specic conductivities of the SDS and SDS + CFH mixed systems with different concentrations of CFH in H 2 O and polyols (glucose/fructose) media were recorded with a conductivity meter (digital HI 2315, Hanna, Germany) with a dip cell; the cell constant provided by the company was 1.0 cm À1 . The precision of the employed conductivity meter was about AE0.5%.…”

Influence of Additives and Temperature on the Interaction of Acid Red 151 Dye with Cetyltrimethylammonium Bromide: A Conductometric Study

“…Changes in entropy due to micelle formation ΔS 0 m À Á were calculated from the following equation (Mahbub et al, 2018;Mahbub et al, 2019aMahbub et al, , 2019bMahbub et al, , 2019cMahbub et al, , 2019d:…”

“…When surfactants are added to any solvent, they undergo 'self-assembly' by balancing two opposing interactions (hydrophobic and hydrophilic) with the solvent. The self-assembled structure referred to as 'micelle' is formed after reaching a certain surfactant concentration called critical micelle concentration (CMC) Rub, 2019a, 2019b;Mahbub et al, 2019aMahbub et al, , 2019bMahbub et al, , 2019cMahbub et al, , 2019d.…”