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Apparatus for the patterned deposition of aerosols on substrates Disclosure Number: IPCOM000009862D
Publication Date: 2002-Sep-24
Document File: 1 page(s) / 6K

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Apparatus for the patterned deposition of aerosols on substrates

    In an apparatus for patterned deposition either solid aerosolised particles or fluid aerosolised particles can be generated, then size-classified, then unipolar electrostatic charged in an internal high-voltage corona section, then concentration- homogenised in an expansion chamber, and finally deposited onto a substrate. The basic set-up configurations are presented in the attached figure.

  Key features are: - Use of a rotating-brush solid aerosol generator (i.e. a dust feeder, see Figure ) for the aerosolisation of solid particles, which transfers dry powder particles from a compacted state into an airborne state with the help of both a rotating brush and a dispersion air stream that blows the particles out of the brush and carries it away. Such a dust feeder enables the dispersion of powders with particles sizes well below 1 micrometer in diameter. Size classification of the produced aerosol involves the successive passage of the aerosol through a cyclone and a dust filter (either a simple mechanical filter or a dielectric filter), which removes the larger particles and transmits the smaller particles. Particle aggregates are thus removed.

- Use of a Laskin nozzle for dispersing liquid aerosols into a solvent-saturated pressurised air stream. The aerosolised liquid can contain dispersed solid particles like very small pigment particles or larger spacer particles and potentially other dissolved materials like polymeric materials or e.g. sol-gel precursor materials. Size classification of the liquid aerosol now occurs through the presence of a ba...