Modified chemistry of siloxanes under tensile stress: Interaction with environment

Article Abstract:

The possible interactions between stretched siloxanes and their environment in single molecule atomic force microscopy (AFM) experiments are described in order to determine whether the solvent or trace amounts of water can influence the rupture process. The simulations have shown that the rupture of a covalent bond through a reaction with a molecule from the environment is possible and the attack of the normally hydrophobic siloxane by water when it is stretched has wider implications for the material failure under tensile stress.

Strength of materials, Strength (Materials), Siloxanes, Chemical properties, Atomic properties

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Ion concentration of external solution as a characteristic of micro- and nanogel ionic reservoir

Article Abstract:

The concept of an ion-sensitive hydrogel ionic reservoir is demonstrated for hydrogel particles of three different size ranges. On the basis of the experimental results, a two-step mechanism affecting the kinetics of proton uptake into the hydrogel particles with ionizable groups is proposed, first being the fast binding of ions to the immediate surface of each particle and second, a slower successive diffusion of bound sites into the nest inner layer of polymer network.

Ionic mobility, Dynamics, Dynamics (Mechanics), Monomers, Properties

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Local probe and conduction distribution of proton exchange membranes

Article Abstract:

Sensing atomic force microscopy is used to study proton exchange membranes (Nafion) to examine the correlation between the surface morphology and ionic domains and to probe the local ionic conduction distribution in the membranes.

Neutrons, Cell membranes, Neutron scattering, X-ray analysis

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