Thermodynamic Properties of Micellization of Sodium Dodecylbenzene Sulfonate in the Aqueous-Rich Region of 1-Pentanol and 1-Hexanol

Abstract

Apparent molar volumes, Φv, and isentropic compressibilities, κ s , of the aqueous solutions of anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), have been derived from experimental densities, ρ, and speed of sound, u, data measured below 0.40 mol·kg−1 at T = (298.15, 303.15, 308.15, and 313.15) K using an Anton Paar densimeter (DSA-5000). Conductance measurements were also made for aqueous solutions of SDBS to obtain critical micelle concentration at the above temperatures. Apparent molar volumes and isentropic compressibilities of 1-pentanol and 1-hexanol dissolved in aqueous micellar solutions of SDBS were determined as a function of molalities of surfactant (0.05 and 0.1) mol·kg−1 and alcohols at T = (298.15 and 308.15) K. The standard partial molar volumes, Φo v, and transfer volume, Φo v (tr), have been calculated for rationalizing various interactions in the studied solutions. Viscosity measurements were made for the above-mentioned alcohols in aqueous solutions of SDBS to obtain relative viscosity and viscosity B-coefficient. The second transition of aqueous sodium dodecylbenzene sulfonate in the postmicellar region has been obtained. Proton NMR chemical shift measurements in micelle solutions containing 1-pentanol have also been made, the results of which support the conclusions drawn from thermodynamic measurements.

Modeling viscosity of alcohols based on the CPA-EoS + ƒ-theory

“…Included in these tables are the temperature ranges, pressure, number of points (NP), the experimental uncertainty, and the experimental method used to measure the viscosity (CT, capillary tube viscometer (CT viscometer used for most of the measurements at 1 bar is the Ubbelohde viscometer); FB, falling body viscometer; VW, vibrating wire viscometer; DCT, capillary tube viscometer (double-capillary tube); CCT, viscometer used for most of the measurements at 1 bar is the Canon-Ubbelohde viscometer; HA, HAAKE viscometer (Rotovisco RV3); AP, Anton Paar automatic micro-viscometer (AMVn type); APB, Anton Paar BmbH viscometer (AMVn type); US, Ubbelohde suspended level viscometer, and CF, Cannon-Fenske viscometer). Reference T-range (K) P (bar) NP Uncertainty (%) Method [64] 298-308 1 2 -US [65] 303-323 1 3 -CF…”

Solubility enhancement of anthracene and pyrene in the mixtures of a cleavable cationic gemini surfactant with conventional surfactants of different polarities

“…The hydrophobicity of the alkyl chain may affect the antimicrobial as well as other membrane interactions. As compared to the longer alkyl chain gemini surfactants [24], 12-E2-12 was found to be less hemolytic as indicated by its higher HC 50 . The cationic ester-linked gemini surfactant shows hemolytic activity at higher concentration than the conventional cationic surfactant which indicates its less toxicity to human cells [24].…”

Thermodynamic and Ft-Ir Study of Micellization of Sodium Dodecylbenzene Sulfonate in Some Simple Alcohols

“…It was purified by the method given in the literature (Dubey, 2009;Alauddin et al, 1988). The purified product was dried under vacuum in the presence of P 2 O 5 for a few days.…”

“…The micellization of SDBS in aqueous solution and its interactions with medium chain alcohols, 1-pentanol and 1-hexanol, have been examined critically (Dubey, 2009) in which various thermodynamic parameters are assessed at different concentrations of surfactant as well as that of alcohols. It has been observed that the short chain alcohols are preferentially solubilized in the palisade layer, which contains the surfactant head groups as is concluded from the NMR studies (Reekmans et al, 1990).…”

“…As a continuation of my studies on micellization behavior of anionic surfactants with aqueous-rich region of alcohols (Dubey, 2008(Dubey, , 2009), in the present study an attempt has been made to understand micellization behavior of sodium dodecylbenzene sulfonate (SDBS) in aqueous medium with monohydric alcohols using conductance measurements. One of the reasons for the present interest in studying the effect of alcohols is the existence of structural consequences of strong intermolecular interactions.…”