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http://hdl.handle.net/1942/26335
Title: | Investigation of the spatial resolution of a laser-based stimulation process for light-addressable hydrogels with incorporated graphene oxide by means of IR thermography | Authors: | BREUER, Lars Mang, Thomas Schoening, Michael J. THOELEN, Ronald Wagner, Torsten |
Issue Date: | 2017 | Publisher: | ELSEVIER SCIENCE SA | Source: | SENSORS AND ACTUATORS A-PHYSICAL, 268, p. 126-132 | Abstract: | The development of lab-on-chip (LoC) devices has led to a demand of new microactuator technologies. Light-responsive hydrogels are promising candidates as actuator materials for this type of applications. These are polymers that change their water content and volume significantly upon illumination with a light source. For proper operation, the spatial resolution of the stimulation process is an important parameter. To investigate this resolution, poly(N-isopropylacrylamide) (PNIPAAm) hydrogels with incorporated graphene oxide (GO) were monitored with an infrared (IR) camera during illumination with a laser source. The GO nanoparticles, convert the absorbed light energy into heat and for temperatures above the lower critical solution temperature (LCST), the polymer collapses. Therefore, the desired actuated area has to have a temperature above the LCST. A mathematical model was used to fit the recorded spatial temperature profiles in order to obtain the width at the LCST and to evaluate the temporal progression of the stimulated area. The results enable the development of new stimulation strategies and enhance the understanding of the spatial resolution of light-addressable hydrogels. Furthermore, the required stimulation time for different laser powers is presented. (C) 2017 Published by Elsevier B.V. | Notes: | [Breuer, Lars; Schoening, Michael J.; Wagner, Torsten] Aachen Univ Appl Sci, INB, D-52428 Julich, Germany. [Breuer, Lars; Thoelen, Ronald] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Mang, Thomas] Aachen Univ Appl Sci, Inst Appl Polymer Chem IAP, D-52428 Julich, Germany. [Schoening, Michael J.; Wagner, Torsten] Res Ctr Julich, Inst Complex Syst ICS 8, D-52428 Julich, Germany. | Keywords: | Responsive hydrogels; Light-addressable actuator; Graphene oxide; Lab-on-chip system; Spatial resolution;responsive hydrogels; light-addressable actuator; graphene oxide; lab-on-chip system; spatial resolution | Document URI: | http://hdl.handle.net/1942/26335 | ISSN: | 0924-4247 | e-ISSN: | 1873-3069 | DOI: | 10.1016/j.sna.2017.11.031 | ISI #: | 000418966700017 | Rights: | © 2017 Published by Elsevier B.V. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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