Micellar structure of an ethylene oxide-propylene oxide block copolymer: a small-angle neutron scattering study

Article Abstract:

Small-angle neutron scattering is used in studying the micellar structure of an ethylene oxide-propylene oxide triblock copolymer, pluronic F88, in aqueous solution. The role of various electrolytes on the phase behavior of the micelles has also been examined. Block copolymers have inverse solubility-temperature relationships and undergo phase separation at the cloud point. Results indicate that a 5 wt % F88 solution in water contains unimers that are fully dissolved Gaussian chains when the temperature is less than 30 degrees C. Block copolymers form micelles with a central core at ambient temperatures.

Analysis, Ethylene oxide, Block copolymers, Propylene oxide

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Selenium nanoparticles: a small-angle neutron scattering study

Article Abstract:

Research was conducted to examine the growth process of selenium nanoparticles using different techniques. The nanoparticles were prepared through a reverse micelle method and characterized using optical spectroscopy, X-ray diffraction and transmission electron microscopy. The small-angle neutron scattering approach was used to examine the micelle structure. Results prove that the micelle structure was unaffected by the conditions of the reaction.

Neutrons, Selenium, Selenium (Chemical element), Neutron scattering

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Small-angle neutron-scattering and viscosity studies of CTAB/NaSal viscoelastic micellar solutions

Article Abstract:

A study was conducted to analyze the viscoelastic characteristics of micellar solutions of cationic surfactant cetyltrimethylammonium bromide during the presence of sodium salicylate. The solutions were examined as a function of NaSal concentration at different surfactant temperatures. Experimental results indicated that the micelles behaved as living polymers beyond the first viscosity maximu.

Cations, Surface active agents, Viscoelasticity, Salicylates

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