Translational diffusion in lipid bilayers: dynamic free-volume theory and molecular dynamics simulation

Article Abstract:

A study relation to research on the major functions of biomembranes in regulating molecular bioactivity and transport was conducted to develop theoretical formulas within the context of dynamic free-volume theory where contributions of lipid chain overall rotation and local isomerization to free-volume redistribution in lipid membranes are explicitly considered. These theoretical formulas can predict changes of molecular diffusivity in lipid membranes and other interphases with different molecular properties of solute and membrane.

Membranes (Biology), Lipid membranes, Molecular rotation, Bilayer lipid membranes

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Characterization of the time scales of molecular motion in pharmaceutically important glasses

Article Abstract:

A study was conducted to explore additional methods to characterize the time scales of molecular motion below glass transition temperature in representative amorphous systems using a combined experimental and theoretical approach. This approach included the estimation of the Kauzmann temperature where configurational entropy in the equilibrium supercooled liquid vanishes and the degree of mobility is reduced to a level equivalent to that of the crystalline state. Experimental methods and results are discussed.

Supercooled liquids, Amorphous substances, Amorphous materials

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Anomalous translational diffusion: a new constraint for models of molecular motion near the glass transition temperature

Article Abstract:

Research is presented demonstrating the transition from Fickian diffusion to non-Fickian translational motion of tetracene in polystyrene. The technique used is photobleaching.

Models, Chemistry, Physical and theoretical, Physical chemistry, Diffusion, Diffusion (Physics), Polystyrene

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