Synthesis of spherical microcapsules by photopolymerization in aerosols |
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Authors: | C Esen Dr T Kaiser M A Borchers G Schweiger |
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Institution: | 1. Laseranwendungstechnik und Me?systeme, Ruhr-Universit?t Bochum, 44780, Bochum, Germany
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Abstract: | The preparation of polymer microcapsules of well defined size in the range of 10–50 μm with different shell thickness to
core diameter ratios is described. An aerosol of monodisperse droplets of a homogeneous ternary liquid system which contained
a hydrophobic component and a hydrophilic component dissolved in a high-volatile mutual solvent, was produced by dispersing
with a vibrating-orifice aerosol generator. After the evaporation of the solvent in a nitrogen atmosphere the particles demix
and form a two-phase droplet of core-shell type. These droplets were illuminated with UV light and polymerized to highly monodisperse
microcapsules with a solid polymer shell and a liquid core. The properties of the resulting particles (size, size distribution,
shell thickness, shape and surface characteristics) were investigated by scanning electron microscopy, Raman spectroscopy
on single optically levitated particles, and confocal Raman micro spectroscopy. The microcapsules were highly monodisperse
and have spherical shape.
Received: 24 July 1996 Accepted: 29 August 1996 |
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Keywords: | Photopolymerization vibrating orifice aerosol generator core-shell particles Raman spectroscopy optical levitation confocal micro Raman spectroscopy microspheres |
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