Hydrogel-based Chemical and Biochemical MEMS-Sensors (Video) Event as iCalendar

(Seminars)

04 April 2017

4 - 5pm

Venue: Ground floor seminar room (G10)

Location: 70 Symonds Street, Auckland Central

An ABI seminar by Prof Gerald Gerlach, Institute of Solid State Electronics, TU Dresden, Germany

Abstract

Hydrogels are cross-linked polymer networks able to absorb or to release large amounts of water. The water uptake is associated with a considerable volume change. In doing so, hydrogels show two remarkable properties: (a) The strong volume change can be excited by a large spectrum of different physical (e.g. temperature, electrical voltage, magnetic field) and chemical factors (e.g. pH value). (b) This swelling process is reversible. These properties make hydrogels a promising candidate for being used both in sensors and actuators and allow their integration into microsystems. Hence, hydrogel-based MEMS enable novel solutions in microsystem technology which are of high functional potential and cost-effective. The talk will report on the scientific fundamentals for hydrogel materials and properties essentially required for their usage in chemical and biochemical sensors. To achieve this goal many shortcomings have to be solved currently which hinder or even prevent the application of hydrogels in technical applications. In this sense, particular materials and manufacturing processes are required which make the hydrogels suitable for these purposes (relevant functionality; high sensitivity, selectivity and long-term stability; fast response time). The talk will focus on pH-sensors, implantable biochemical sensors, humidity sensor switches, and wound sensors.