Hydrogel Sensors and Actuators: Engineering and Technology by O. Okay (auth.), Gerald Gerlach, Karl-Friedrich Arndt (eds.)

By O. Okay (auth.), Gerald Gerlach, Karl-Friedrich Arndt (eds.)

Hydrogels are a desirable category of polymers which express a tremendous skill of swelling lower than the impression of temperature, pH price or concentrations of other species in aqueous suggestions. the amount switch can volume as much as a number of hundred percentage. This particular behaviour is already utilized in such purposes like disposable diapers, touch lenses or drug-delivery systems.

The skill to accomplish mechanical paintings has been shifted the technical curiosity an increasing number of in the direction of sensors and actuators exploiting the thermo-chemo-mechano-electrical coupling inside hydrogels. The accuracy necessities for such units are even more tough than for past functions. as a result, a deep wisdom of either the cloth and the sensible homes of hydrogel sensors and actuators is required. The monograph describes state of the art and up to date advancements for those fabrics in sensor and actuator technology.

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2004) l Protein adsorption (Hong et al. 2004) l Micro-reactors (Harmon and Tang 2003) l “dip-pen” nano-lithography (Wounters and Schubert 2003) l Automated fluidic valves (Beebe et al. 2000; Richter et al. 2003) l Plasma immobilization (Schmaljohann et al. 2005) l l Ink-jet printing (de Gans et al. 2004) Sensors (Marshall et al. 2003; Richter et al.

4) (Charlesby and Pinner 1959; Charlesby 1960), see Fig. 9. 1=D ¼ 1=Dg at s ¼ 1 or s þ s1=2 ¼ 2 ð5Þ Many authors proposed deviations from the simple Charlesby-Pinner-Eq. (5). The experimental data do not fit the straight line predicted by Charlesby and Pinner. 010 Fig. 9 Sol-gel analysis of PVP gel. 03. Reprinted from Burkert et al. (2007a), p. 1326. Copyright (2007), with permission from Elsevier 34 D. Kuckling et al. deviation of the real MWD of the polymer from the most-probable MWD and to other relations between Mn and Mw.

As particles or as thin films. Procedures to patterning smart hydrogel layers on different substrates (glass, silicon wafer) are described below. g. complexes, aggregates, or micelles. Polymers of different size can be filled with ferroelectric or ferromagnetic particles and afterwards cross-linked. 4 Examples of Gel Synthesis a) Influence of concentration and temperature Poly(vinyl methyl ether) (PVME) is known as a temperature-sensitive polymer. The polymer finds industrial application as adhesive in packaging and is produced in industrial scale.

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