Surface Nanobubbles as a Function of Gas Type

Surface Nanobubbles as a Function of Gas Type

We experimentally investigate the nucleation of surface nanobubbles on PFDTS-coated silicon as a function of the specific gas dissolved in water. In each case, we restrict ourselves to equilibrium conditions (c = 100%, T liquid = T substrate). Not only is nanobubble nucleation a strong function of g...

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Veröffentlicht in:Langmuir 2011-07, Vol.27 (14), p.8694-8699
Hauptverfasser: van Limbeek, Michiel A. J, Seddon, James R. T
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Sprache:eng
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Chemistry
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Solid-liquid interface
Surface physical chemistry
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Seddon, James R. T
description We experimentally investigate the nucleation of surface nanobubbles on PFDTS-coated silicon as a function of the specific gas dissolved in water. In each case, we restrict ourselves to equilibrium conditions (c = 100%, T liquid = T substrate). Not only is nanobubble nucleation a strong function of gas type, but there also exists an optimal system temperature of ∼35 −40 °C where nucleation is maximized, which is weakly dependent on gas type. We also find that the contact angle is a function of the nanobubble radius of curvature for all gas types investigated. Fitting this data allows us to describe a line tension that is dependent on the type of gas, indicating that the nanobubbles sit on top of adsorbed gas molecules. The average line tension was τ ≈ −0.8 nN.
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subjects Chemistry
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Solid-liquid interface
Surface physical chemistry
title Surface Nanobubbles as a Function of Gas Type
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