Effect of hydrophobic chain length of amphiphilic silicone oil (copolymer) on the nonionic surfactant layer curvature

Article Abstract:

The formation and phase behavior of self-assemblies in ternary water/ penta (oxyethylene) dodecyl ether (C12EO5)/amphiphilic silicone copolymer, poly (dimethylsiloxane)-poly (oxyethylene) dodecyl ether/amphiphilic silicone copolymer, poly (dimethylsiloxane)-poly (oxyethylene) systems were studied. It was observed that long and bulky chains make an oil core and this tends to make the curvature more positive, being this effect pronounced with increasing the hydrophobic chain length.

Science & research, Research, Water chemistry, Copolymers

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Comparative study of planar motion in monomeric and dimeric discotics

Article Abstract:

Deuterium NMR spectra are reported in powder samples of discotic monomer and dimer as function of temperature in their column [Col.sub.ho] phases. By comparing the diffusive rates for the two samples, it is concluded that the planar motion in the dimer is at least 30 times smaller than that of the monomer leading to an enhancement of charge and energy transport in discotic dimer systems.

Analysis, Nuclear magnetic resonance spectroscopy, Deuterium, Magnetization

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Effect of hydrophilic- and hydrophobic-chain lengths on the phase behavior of A-B-type silicone surfactants in water

Article Abstract:

The phase behavior of a long hydrophobic chain A-B-type silicone surfactant, Me3SiO-(Me2SiO)(sub (m-2)-Me2-SiCH2CH2CH2-O-(CH2CH2O)(super n)H [Si(sub m C3EOn)] in water is investigated by phase study and small-angle X-ray scattering (SAXS). The effect of both hydrophilic and lipophilic chain lengths on the self-organization is discussed.

Chemical properties

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