In this paper we investigated the effect of quaternary ammonium bromide, R4NBr(R = methyl, ethyl,... more In this paper we investigated the effect of quaternary ammonium bromide, R4NBr(R = methyl, ethyl, propyl, butyl) on the micellization of the CTAB/long-chain alcohol (C9OH-C12OH) micellar system using viscosity, rheology, dynamic light scattering (DLS), and cryo-TEM analysis. The results indicates that, apart from concentration (C0), and chain length of alcohol (n), micellar properties of the CTAB/R4NBr/alcohol system showed a strong dependence on alkyl chain length of R4NBr. The viscosity behavior of CTAB/R4NBr with C0 was similar to our previous studied system, CTAB/KBr/alcohol, and is attributed to alcohol induced morphological transition. The viscosity, rheology, and DLS analysis reveal the dependence of n on the micellar growth of the CTAB/R4NBr/alcohol system. The result showed tetra butyl ammonium bromide (Bu4N+) as least effective to induce micellar growth in the CTAB/alcohol system compared to other quaternary ammonium salts. This is discussed on the basis of change in solubilization behavior with the chain length of R4NBr. The cryo-TEM analysis of the CTAB/R4NBr/alcohol micellar system showed vesicles to short rod-like micelle transition on changing R from methyl to butyl, confirming the effectiveness of quaternary ammonium bromide in tuning morphological transition in the system.
The effect of long chain alcohols (C9OH–C12OH) on the micellar properties of CTAB in the presence... more The effect of long chain alcohols (C9OH–C12OH) on the micellar properties of CTAB in the presence of an inorganic salt, KBr, has been systematically studied by viscometry, rheology, DLS and the direct imaging technique, i.e. cryo-TEM.
In this paper we investigated the effect of quaternary ammonium bromide, R4NBr(R = methyl, ethyl,... more In this paper we investigated the effect of quaternary ammonium bromide, R4NBr(R = methyl, ethyl, propyl, butyl) on the micellization of the CTAB/long-chain alcohol (C9OH-C12OH) micellar system using viscosity, rheology, dynamic light scattering (DLS), and cryo-TEM analysis. The results indicates that, apart from concentration (C0), and chain length of alcohol (n), micellar properties of the CTAB/R4NBr/alcohol system showed a strong dependence on alkyl chain length of R4NBr. The viscosity behavior of CTAB/R4NBr with C0 was similar to our previous studied system, CTAB/KBr/alcohol, and is attributed to alcohol induced morphological transition. The viscosity, rheology, and DLS analysis reveal the dependence of n on the micellar growth of the CTAB/R4NBr/alcohol system. The result showed tetra butyl ammonium bromide (Bu4N+) as least effective to induce micellar growth in the CTAB/alcohol system compared to other quaternary ammonium salts. This is discussed on the basis of change in solubilization behavior with the chain length of R4NBr. The cryo-TEM analysis of the CTAB/R4NBr/alcohol micellar system showed vesicles to short rod-like micelle transition on changing R from methyl to butyl, confirming the effectiveness of quaternary ammonium bromide in tuning morphological transition in the system.
The effect of long chain alcohols (C9OH–C12OH) on the micellar properties of CTAB in the presence... more The effect of long chain alcohols (C9OH–C12OH) on the micellar properties of CTAB in the presence of an inorganic salt, KBr, has been systematically studied by viscometry, rheology, DLS and the direct imaging technique, i.e. cryo-TEM.
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Papers by Jasila Karayil