eprintid: 32572
rev_number: 24
eprint_status: archive
userid: 7129
dir: disk0/00/03/25/72
datestamp: 2022-12-22 10:55:42
lastmod: 2023-03-14 10:32:09
status_changed: 2022-12-22 10:55:42
type: preprint
metadata_visibility: show
creators_name: Spratte, Tobias
creators_name: Geiger, Sophie
creators_name: Colombo, Federico
creators_name: Mishra, Ankit
creators_name: Taale, Mohammadreza
creators_name: Hsu, Li-Yun
creators_name: Blasco, Eva
creators_name: Selhuber-Unkel, Christine
title: Increasing the Efficiency of Thermoresponsive Actuation at the Microscale by Direct Laser Writing of pNIPAM
subjects: ddc-000
subjects: ddc-500
subjects: ddc-530
subjects: ddc-540
subjects: ddc-620
divisions: i-160200
keywords: soft microactuators, direct laser writing, two-photon-polymerization, responsive 23 materials, thermoresponsive hydrogels
note: This is the pre-peer reviewed version of the following article: Spratte, T., Geiger, S., 1 Colombo, F., Mishra, A., Taale, M., Hsu, L.-Y., Blasco, E., Selhuber-Unkel, C., Increasing the Efficiency of Thermoresponsive Actuation at the Microscale by Direct Laser Writing of pNIPAM. Adv. Mater. Technol. 2022, 2200714., which has been published in final form at https://doi.org/10.1002/admt.202200714.
abstract: Thermoresponsive hydrogels such as poly(N-isopropylacrylamide) (pNIPAM) are highly interesting materials for generating soft actuator systems. Whereas the material has so far mostly been used in macroscopic systems, we here demonstrate that pNIPAM is an excellent material for generating actuator systems at the micrometer scale. Two-Photon Direct Laser Writing was used to precisely structure thermoresponsive pNIPAM hydrogels at the micrometer scale based on a photosensitive resist. We systematically show that the surface- to-volume ratio of the microactuators is decisive to their actuation efficiency. The phase transition of the pNIPAM was also demonstrated by nanoindentation experiments. We observed that the mechanical properties of the material can easily be adjusted by the writing process. Finally, we found that not only the total size and surface structure of the microactuator plays an important role, but also the crosslinking of the polymer itself. Our results demonstrate for the first time a systematic study of pNIPAM-based microactuators, which can easily be extended to systems of microactuators that act cooperatively, e.g., in microvalves.
date: 2022
publisher: Universität
id_scheme: DOI
id_number: 10.11588/heidok.00032572
ppn_swb: 1833425790
own_urn: urn:nbn:de:bsz:16-heidok-325728
language: eng
bibsort: SPRATTETOBINCREASING20221006
full_text_status: public
place_of_pub: Heidelberg
citation:   Spratte, Tobias ; Geiger, Sophie ; Colombo, Federico ; Mishra, Ankit ; Taale, Mohammadreza ; Hsu, Li-Yun ; Blasco, Eva ; Selhuber-Unkel, Christine  (2022) Increasing the Efficiency of Thermoresponsive Actuation at the Microscale by Direct Laser Writing of pNIPAM.  [Preprint]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/32572/7/Spratte_Increasing_efficiency_thermoresponsive_actuation_2022.pdf