Heterogeneous freezing on pyroelectric poly(vinylidene fluoride-co-trifluoroethylene) thin films

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

Active deicing of technical surfaces, such as for wind turbines and heat exchangers, currently requires the usage of heat or chemicals. Passive coating strategies that postpone the freezing of covering water would be beneficial in order to save costs and energy. One hypothesis is that pyroelectric active materials can achieve this because of the surface charges generated on these materials when they are subject to a temperature change. High-quality poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films with a high crystallinity, prefererd edge-on orientation, low surface roughness, and comprised of the beta-analogous ferroelectric phase were deposited by spin-coating. Freezing experiments with a cooling rate of 1 K min(-1)were made on P(VDF-TrFE) coatings in order to separate the effect of different parameters such as the poling direction, film thickness, used solvent, deposition process, underlying substrate, and annealing temperature on the achievable supercooling. The topography and the underlying substrate significantly changed the distribution of freezing temperatures of water droplets in contact with these thin films. In contrast, no significant effect of the thickness, morphology, or pyroelectric effect of the as-prepared domain-state on the freezing temperatures was found.

Details

OriginalspracheEnglisch
Seiten (von - bis)1150-1155
Seitenumfang6
FachzeitschriftSurface and Interface Analysis
Jahrgang52
Ausgabenummer12
Frühes Online-DatumMärz 2020
PublikationsstatusVeröffentlicht - Dez. 2020
Peer-Review-StatusJa

Externe IDs

Scopus 85082178913
ORCID /0000-0001-5121-5974/work/142242891
ORCID /0000-0002-8740-8310/work/170542555

Schlagworte

Forschungsprofillinien der TU Dresden

DFG-Fachsystematik nach Fachkollegium

Schlagwörter

  • P(VDF-TrFE), Electric double layer, Heterogeneous freezing, Parameter study, Pyroelectric effect