Controlling Wettability and Photochromism in a Dual‐Responsive Tungsten Oxide Film

Abstract

Wahlweise nass oder trocken! Wolframoxidfilme, die durch einfache elektrochemische Abscheidung erhältlich sind, sind die ersten Beispiele für eine duale Oberflächenfunktionalität. Das reversible Schalten der Benetzbarkeit zwischen Superhydrophobie und Superhydrophilie gelingt durch den Wechsel zwischen Bestrahlung mit UV‐Licht und Lagerung im Dunkeln; mit dem Wechsel geht eine Photochromie einher (siehe Bild).

Photoinduced Reversible Topographical Changes on Diarylethene Microcrystalline Surfaces with Biomimetic Wetting Properties

“…[2] In other systems, the wettability is controlled between superhydrophobic lotus and superhydrophilic surfaces or between superhydrophobic petal and superhydrophilic surfaces. [2] In other systems, the wettability is controlled between superhydrophobic lotus and superhydrophilic surfaces or between superhydrophobic petal and superhydrophilic surfaces.…”

“…[16d] This is one advantage of our system because the surface wettability of our system was changed by photoinduced surface topographical changes, but the surface wettability in other photoinduced wettability changeable systems can only be changed by photo-controlling the surface polarity on the rough surfaces without changing the surface topography. [2] In other systems, the wettability is controlled between superhydrophobic lotus and superhydrophilic surfaces or between superhydrophobic petal and superhydrophilic surfaces. Photocontrol between the lotus and petal surfaces can be performed by controlling the size of the surface roughness using our system.…”

“…[1][2][3] The wettability of solid surfaces with liquids is governed by two factors: chemical and geometrical. [1][2][3] The wettability of solid surfaces with liquids is governed by two factors: chemical and geometrical.…”

“…Superhydrophobic surfaces have recently attracted much attention from both scientific and application points of view. [1][2][3] The wettability of solid surfaces with liquids is governed by two factors: chemical and geometrical. [4] The chemical factor determines the contact angle (CA) of a liquid on a flat surface and the geometrical (roughness) factor enhances the wetting property for a hydrophilic surface (or non-wetting for a hydrophobic surface).…”

Enthalpy‐Driven Three‐State Switching of a Superhydrophilic/Superhydrophobic Surface

“…The control of surface properties, such as wettability, has long been an interesting topic in materials science because of the widely practical applications. [1][2][3][4][5][6][7] Inspired by nature, we recently reported intelligent surfaces that are switchable between superhydrophilicity and superhydrophobicity in response to external stimuli such as heat [8] and light [9] through the introduction of surface roughness. [2][3][4] However, nearly all of these switches of surface wettability have so far been limited to entropy-driven processes; enthalpy-driven switchable surfaces are not well explored, although various important life phenomena and molecular recognition behaviors are often dominated by enthalpy-driven processes.…”