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Reversibly Photoswitchable High-Aspect Ratio Surfaces

Titelangaben

Constante Ibarra, Gissela Katherine ; Apsite, Indra ; Schönfeld, Dennis ; Pretsch, Thorsten ; Ionov, Leonid:
Reversibly Photoswitchable High-Aspect Ratio Surfaces.
In: Small Structures. Bd. 4 (2023) Heft 10 . - 2300040.
ISSN 2688-4062
DOI: https://doi.org/10.1002/sstr.202300040

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft
Deutsche Forschungsgemeinschaft (DFG) (grant no. IO 68/15-1)
European Regional Development Fund (project 85007031).
Fraunhofer Excellence Cluster “Programmable Materials”, grants number PSP elements 40-04068-2500-00007 and 40-03420-2500-00003.

Abstract

Herein, the fabrication of light-sensitive high-aspect ratio surfaces with switchable topography using melt-electrowriting of shape-memory polymers and deposition of light-to-heat converting black ink on it by dip coating is reported on. The lamellae exposed to low temperatures are hard and cannot be deformed by water droplets. The temperature reached upon illumination of surfaces is close to the melting point of the soft segment of the polyurethane that leads to softening of the polymer. Due to this, it is possible to locally deform and recover the light-softened surface structures by water droplets deposited on lamellae. The deformed state can be fixed by cooling down resulting in the crystallization of the polymer. Thus, the reversibility of local deformation can be achieved. Finally, the application of the developed approach and materials for the fabrication of smart light-controlled valves is demonstrated, which can be used for the controlled mixing of fluids in microfluidic devices.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Nein
Keywords: light-responsive materials; shape-memory polymers; tunable materials; wetting
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Professur Biofabrikation > Professur Biofabrikation - Univ.-Prof. Dr. Leonid Ionov
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Professur Biofabrikation
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 12 Jun 2023 07:26
Letzte Änderung: 17 Jun 2024 12:29
URI: https://eref.uni-bayreuth.de/id/eprint/81285