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Stimuli-sensitive ionic hydrogels are suitable materials for the detection of pH, because they exhibit a tremendous volume phase transition in response to changes in pH. The combination of such hydrogels with a micromachined piezoresistive pressure transducer enables the assembly of a new class of pH microsensors. The hydrogel swelling behavior, the sensor properties as well as different sensor designs are discussed. In addition, the great capability of this sensor type towards its use for biomedical applications is presented. In particular, the properties of a sensor containing a HPMA/DMA/TEGDMA-hydrogel, which shows a sharp volume phase transition in the physiological pH range, are described.

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Piezoresistive pH Microsensors Based on Stimuli-Sensitive Polyelectrolyte Hydrogels  Piezoresistive pH-Mikrosensoren auf der Basis stimuli-sensitiver polyelektrolytischer Hydrogele