Superexpansive gels

Article Abstract:

A new technique for fabricating aerogels, a low-density sponge-like form of solids, at ambient pressures involves transforming the liquid in the cavities into a supercritical fluid and then coating the inner surface with silyl rather than hydroxyl groups. This innovation was designed by Jeffrey Brinker's research group and may solve the requirements for autoclave pressure drying that limit the previous ambient technique because Brinker's gels can re-expand. Enormous volume changes undergone during production of Brinker's silica gels are discussed.

Colloids, Silica gel, Aerogels

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Voltage-sensitive magnetic gels as magnetic resonance monitoring agents

Article Abstract:

Magnetic particles of iron oxide in the polymer network are incorporated in the synthesis of a polyelectrolyte gel. The water proton relaxation rates in aqueous suspensions of particles of the magnetic gel in an electric field increases significantly. These gels may play a part in magnetic resonance imaging similar to that of voltage-sensitive dyes in optical imaging.

Research, Usage, Ferric oxide, Polyelectrolytes

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