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Temperature Dependence of Water Contact Angle on Teflon AF1600.


ABSTRACT: In this work, we investigate the change of contact angle (CA) of a water droplet during evaporation on a Teflon AF1600 surface in the temperature range between 20 and 80 °C under standard laboratory conditions. An almost constant initial CA and a significant increase of the stabilized CA have been observed. The results reveal a temperature-dependent CA change, mainly due to water adsorption on the solid surface. Soaking experiments indicate that besides adsorption, a temperature-independent friction-like force contributes to the pinning of triple-line and therefore to the CA change. We propose an adsorption coverage parameter and a friction-like force to describe the CA change. Furthermore, we describe a reproducible process to produce smooth and homogeneous Teflon AF1600 thin films, minimizing the influence of roughness and local heterogeneity on the CA.

SUBMITTER: Xiang Y 

PROVIDER: S-EPMC8812120 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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Temperature Dependence of Water Contact Angle on Teflon AF1600.

Xiang Yijie Y   Fulmek Paul P   Platz Daniel D   Schmid Ulrich U  

Langmuir : the ACS journal of surfaces and colloids 20220120 4


In this work, we investigate the change of contact angle (CA) of a water droplet during evaporation on a Teflon AF1600 surface in the temperature range between 20 and 80 °C under standard laboratory conditions. An almost constant initial CA and a significant increase of the stabilized CA have been observed. The results reveal a temperature-dependent CA change, mainly due to water adsorption on the solid surface. Soaking experiments indicate that besides adsorption, a temperature-independent fric  ...[more]

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