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search.filters.applied.f.access: openAccess × DDC: 620 × Publisher: Amsterdam [u.a.] : Elsevier × Subject: Hydrogels × WGL Institute: IPF ×

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    Hydrogel-based actuators: Possibilities and limitations
    (Amsterdam [u.a.] : Elsevier, 2014) Ionov, L.
    The rapid development of microtechnology in recent times has increased the necessity for the development of devices, which are able to perform mechanical work on the micro- and macroscale. Among all kinds of actuators, the ones based on stimuli-responsive hydrogels, which are three-dimensional polymer networks strongly imbibed with water, deserve particular attention. This paper aims to provide a brief overview of stimuli-responsive hydrogel actuators with respect to their sensitivity to different stimuli, different kinds of deformation, the possibilities of generating different types of movement, as well as their applications.
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    Macroporous smart hydrogels for fast-responsive piezoresistive chemical microsensors
    (Amsterdam [u.a.] : Elsevier, 2011) Schulz, V.; Zschoche, S.; Zhang, H.P.; Voit, B.; Gerlach, G.
    Within this work we present the synthesis and characterization of a pH-sensitive macroporous p(AAm-co-AA) hydrogel with an interconnected channel structure to enhance diffusion of aqueous solutions. The hydrogel is characterized by SEM and mercury porosimetry. Furthermore, the hydrogel is successfully integrated into piezoresistive microsensors measuring the hydrogel swelling due to pH changes. A response time reduction of about 80% compared to sensors with conventional non-porous hydrogels is accomplished.