Photoswitchable Dissipative Two-Dimensional Colloidal Crystals.
Angew Chem Int Ed Engl
; 58(27): 9145-9149, 2019 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-31041837
ABSTRACT
Control over particle interactions and organization at fluid interfaces is of great importance both for fundamental studies and practical applications. Rendering these systems stimulus-responsive is thus a desired challenge both for investigating dynamic phenomena and realizing reconfigurable materials. Here, we describe the first reversible photocontrol of two-dimensional colloidal crystallization at the air/water interface, where millimeter-sized assemblies of microparticles can be actuated through the dynamic adsorption/desorption behavior of a photosensitive surfactant added to the suspension. This allows us to dynamically switch the particle organization between a highly crystalline (under light) and a disordered (in the dark) phase with a fast response time (crystallization in ≈10â
s, disassembly in ≈1â
min). These results evidence a new kind of dissipative system where the crystalline state can be maintained only upon energy supply.
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MEDLINE
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En
Ano de publicação:
2019
Tipo de documento:
Article