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- W2481294384 abstract "Spectroturbidimetry, conductimetry, ultrafiltration, ultracentrifugation, vapor sorption, polarizing microscopy, and nuclear magnetic resonance spectroscopy were used to study phase behavior of pure sodium 8-phenyl-n-hexadecyl-p-sulfonate in water as a function of temperature and sodium chloride concentration, and in decane. The first four techniques gave information on solubility and states of dispersion ranging from visible, settling suspensions to transparent, stably dispersed submicroscopic particles. Surfactant solubility in water was only 0.06 wt% at 25°C, increased 11-fold at 90°C, but decreased 300-fold with 3 wt% salt at 25°C. The surfactant-rich phase in equilibrium with isotropic aqueous solution was shown by polarizing microscopy to be a liquid crystal, probably lamellar; 13C-nmr-aided identification and vapor sorption gave its water content as about 25 wt% at 25°C. Changing the order of mixing of surfactant and salt in water altered the state of dispersion of the liquid crystal present. Surfactant solubility in decane was 0.04 wt% at 25°C and about 9 wt% at 50°C. The surfactant-rich phase in equilibrium with isotropic decane solution was birefringent. About 20 wt% decane was vapor-sorbed by dry surfactant at 25°C. Preliminary polarizing microscopy and nmr results point toward the existence of liquid crystalline states in surfactant-decane and surfactant-decane-water systems." @default.
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- W2481294384 date "1979-03-02" @default.
- W2481294384 modified "2023-09-29" @default.
- W2481294384 title "Phase Behavior of a Pure Alkyl Aryl Sulfonate Surfactant" @default.
- W2481294384 doi "https://doi.org/10.1021/bk-1979-0091.ch003" @default.
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