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Shear-DSC study on the crystal-isotropic phase transition of semidilute aqueous cetyltrimethylammonium bromide (CTAB) solutions

作   者:
Yamamoto T.Wakabayashi T.Kamiyama T.Suzuki H.
作者机构:
Department of Chemistry Kindai University
关键词:
Rod-like micelleShear-induced changesCrystal-to-isotropic transitionShear differential scanning calorimetry (Shear-DSC)Aqueous cetyltrimethylammonium bromide (CTAB) solution
期刊名称:
Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems
i s s n:
0040-6031
年卷期:
2023 年 730 卷
页   码:
摘   要:
© 2023 Elsevier B.V.A differential scanning calorimeter equipped with a steady shear flow system (Shear-DSC) was developed, and the effects of shearing on the crystal-isotropic phase transition were investigated for aqueous cetyltrimethylammonium bromide (CTAB) solutions at 4, 18, and 26 wt%. At 18 wt%, where rod-like micelles are formed in the isotropic phase, the transition temperature Ttrs changes with the shear rate γ˙. At low shear rate (γ˙<1s−1), Ttrs decreases as γ˙ increases due to an increase in the surface energy of the crystal grains. At high shear rate (γ˙>30s−1), Ttrs increases as γ˙ increases because of the orientational ordering of rod-like micelles induced by shearing in the isotropic phase, leading to the formation of a nematic structure. The latter change is suppressed for the solution at 26 wt% because the nematic phase is formed without shearing, whereas it disappears at 4 wt% indicating that the spherical micelles are not deformed by shearing.
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