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- W2896561312 endingPage "13964" @default.
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- W2896561312 abstract "The free scission energy is the thermodynamic parameter that governs the contour length of wormlike micelles (WLMs). It is the contour length and the propensity to coil and entangle that determine the viscoelastic properties of this commercially important substance class. The free scission energy ΔFsc and the associated change in enthalpy ΔHsc and entropy ΔSsc on scission have been determined for a mixed anionic/zwitterionic surfactant system (sodium laureth sulfate and cocamidopropyl betaine) at various salt concentrations (3–5 wt % NaCl). Both enthalpy ΔHsc and entropy ΔSsc changes decrease linearly with increasing NaCl concentration. At NaCl concentrations above 4 wt %, ΔSsc even adopts negative values. The term TΔSsc decreases more rapidly than ΔHsc around room temperature and causes the observed elongation of WLMs upon addition of NaCl. It is suggested that ΔSsc is initially positive due to fewer bound counterions per surfactant molecule at end caps compared to the intact, cylindrical parts before scission, leading to a net release of ions upon scission. Negative values of ΔSsc are attributed to hydrophobic hydration occurring at the end caps at high salt concentrations. 23Na NMR measurements indicate the presence of immobilized ions, supporting a previously proposed ion-cloud model based on neutron scattering results." @default.
- W2896561312 created "2018-10-26" @default.
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- W2896561312 date "2018-10-23" @default.
- W2896561312 modified "2023-10-18" @default.
- W2896561312 title "Enthalpy and Entropy of Scission in Wormlike Micelles" @default.
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- W2896561312 doi "https://doi.org/10.1021/acs.langmuir.8b02930" @default.
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