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Aggregation Behavior of Quaternary Ammonium Gemini Surfactants in Heptane Solution

Author: FuXianMing
Tutor: ZhaoJianZuo
School: Fuzhou University
Course: Physical and chemical
Keywords: Gemini Surfactants Reverse micelles Hexanol solubilization Aggregation behavior W / O microemulsion
CLC: O647.2
Type: Master's thesis
Year: 2005
Downloads: 133
Quote: 1
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Abstract


Quaternary ammonium Gemini surfactant by a coupling group of two ionic surfactants, ionic head group chemically bonded linking, which alters the charge density of the head group of the monomer molecule, the density and geometry of the alkane chain and therefore strongly affect the aggregation of the surfactant molecules as well as forming micelles characteristics. Study of the Gemini surfactant self-organizing regular still mainly concentrated in the aqueous solution, is rarely associated with the non-aqueous systems. In this thesis the financial support of the National Natural Science Foundation of China (Grant No.: 20373012), research quaternary ammonium Gemini surfactant C 12 -the sC 12 · 2Br (s = 2,3,4,5,6,8,12) in heptane aggregation behavior. A quaternary ammonium salt surface active agent dissolved in heptane need to add a cosolvent, Therefore, this first has alcohol as a cosolvent to examine the the its C 12 -SC 12 · 2Br / heptane solubilizing effect law, contains the hexanol in the micelle phase and heptane phase distribution and allocation process, the Gibbs free energy change; on this basis, with iodine probe spectroscopy and water and increasing solution were measured the Series C 12 -sC 12 · 2Br surfactant critical aggregation concentration in heptane crmc, and with the aqueous solution of the critical micelle concentration cmc for comparison, summed up the influence of spacer chain length of C 12 -sC 12 · 2Br gathered ability, and examines the impact of the system, the alcohol content crmc; made of water solubilization method conductivity method of the C 12 -sC the 12 · 2Br reverse micelles saturation of water solubilization; addition, the dilution method C 12 -sC 12 · 2Br reverse microemulsion structure investigated the the different content W0 and join the chain length s of C 12 -sC 12 · 2Br microemulsion structure. The main work and the results are as follows: add hexanol C 12 -sC 12 · 2Br form stable reverse micelles, enabling the C 12 < / sub>-sC 12 · 2Br dissolved in heptane. Hexanol solubilizing n s molar surfactant in n o mol heptane critical molar number n a = an O bn s , b expressed the average micellar phase assigned to the the each C 12 -the sC 12 · 2Br molecule of the already The number of alcohol molecules, b presents a different variation of the number of parity with s, which is attributed to the difference in the degree of bending of the spacer chain sake. The hexanol phase in the micelles phase and heptane partition coefficient K show that the hexanol molecules involved in the formation of reverse micelles allocation process free energy change ΔG 0 → i 0 also support this tendency. C 12 -sC 12 · 2Br in heptane generate anti the critical concentration crmc of the micelles are less than they are in the water to generate positive micelles critical concentration of the cmc and crmc sake change with s, s = 4, the maximum, which is attributed to the the coupling chain length difference, in shorter s range, the coupling chain render the straight state, while longer s range,

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Surfactant chemical
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