Water diffusion and headgroup mobility in polymer-like reverse micelles: evidence of a sphere-to-rod-to-sphere transition

Article Abstract:

A study was conducted to examine the soybean lecithin/water/perdeuterated cyclohexane system through a pulsed gradient spin-echo nuclear magnetic resonance. It was previously established that the polymer-like properties of the system were due to a water-induced one-dimensional growth of the micellar conglomerates into lengthy and flexible cylindrical reverse micelles. Results revealed that the effect of water addition to the system was described as a sphere-to-rod transition at low water content and a rod-to-sphere transition at increased water content.

Micelles, Diffusion, Diffusion (Physics), Polymer colloids

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Size polydispersity determination in emulsion systems by free diffusion measurements via PFG-NMR

Article Abstract:

A new method to determine particle size distribution from NMR self-diffusion data is presented. The method is not subjected to the usual limitations of standard techniques, like an a priori hypothesis of the form of the distribution, or the prerequisite that suitable experimental conditions exist to enclose the whole volume fraction distribution.

Usage, Nuclear magnetic resonance

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Optical absorbance of colloidal suspensions of silver polyhedral nanoparticles

Article Abstract:

The optical absorption of colloidal suspensions made of silver nanoparticles with polyhedral shapes is studied. It is found that colloidal suspensions of silver nanoparticles with a small dispersion of size distribution show very few structural shapes.

Optical properties, Structure, Colloidal silver

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