Monitoring the Transformation of Colloidal Crystals by Styrene Vapor Using Atomic Force Microscopy

Monitoring the Transformation of Colloidal Crystals by Styrene Vapor Using Atomic Force Microscopy

The stages of transformation of a colloidal crystalline film of latex spheres to a new periodic structure were imaged by atomic force microscopy. Colloidal crystalline films were prepared with 320 nm diameter poly(styrene-co-2-hydroxyethyl methacrylate) (PSt/HEMA) spheres. The hexagonally ordered su...

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Veröffentlicht in:Langmuir 2004-04, Vol.20 (8), p.3145-3150
Hauptverfasser: Qin, Dongqi, Tan, Susheng, Qin, Shuhui, Ford, Warren T
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Tan, Susheng
Qin, Shuhui
Ford, Warren T
description The stages of transformation of a colloidal crystalline film of latex spheres to a new periodic structure were imaged by atomic force microscopy. Colloidal crystalline films were prepared with 320 nm diameter poly(styrene-co-2-hydroxyethyl methacrylate) (PSt/HEMA) spheres. The hexagonally ordered surfaces of the colloidal crystalline films were transformed with styrene vapor at room temperature to a new morphology having holes in the surface and the same periodicity as the original films. The surfaces of colloidal crystals and the transformed films have a raspberry-like texture superposed on the 320 nm hexagonal periodicity. Both height images and phase images reveal that the latex spheres shrink and the transformation proceeds by an order−disorder−order sequence. The final structure is an interconnected colloidal array with smaller polystyrene particles dispersed in a continuous PSt/HEMA matrix.
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