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A new device for coating single particles under controlled conditions

Strom, D; Karlsson, S; Folestad, S; Bjorn, I N; Laurell, Thomas LU ; Nilsson, Johan LU and Rasmuson, A (2005) In Chemical Engineering Science 60(16). p.4647-4653
Abstract
A new device for coating a single levitated particle in a controllable environment is designed and tested. This enables fluidized bed processing to be simulated experimentally on a single-particle level. The device consists of a coating chamber, which contains a capillary tube for levitating the particle, a micro-dispenser for producing discrete drops of controlled size and velocity and a device for supplying gas with specified temperature and humidity. The coating chamber consists of two parts, a confined space where the particle is levitated and a droplet insertion cone where the coating solution is injected into the particle suspending gas flow. A capillary with a well-defined diameter connects the droplet insertion cone and the area... (More)
A new device for coating a single levitated particle in a controllable environment is designed and tested. This enables fluidized bed processing to be simulated experimentally on a single-particle level. The device consists of a coating chamber, which contains a capillary tube for levitating the particle, a micro-dispenser for producing discrete drops of controlled size and velocity and a device for supplying gas with specified temperature and humidity. The coating chamber consists of two parts, a confined space where the particle is levitated and a droplet insertion cone where the coating solution is injected into the particle suspending gas flow. A capillary with a well-defined diameter connects the droplet insertion cone and the area where the particle is levitated. The device is equipped with a piezo-actuated flow-through micro-dispenser that has the ability to produce discrete droplets with high reproducibility in terms of droplet size and velocity. The gas required for the coating process is taken from a gas container where the water content is analysed and kept at a minimum. A liquid flow is then introduced into the gas flow at a well-defined flow rate, mixed and evaporated in a three-way mixing vault. The humidified gas flow is then split into two separate flows; a suspending gas flow and a protecting gas flow for the inside of the coating chamber. The device is equipped with a high-speed video camera for monitoring both droplet production and droplet impact. Temperatures and flow rates throughout the device are measured and logged. Preliminary results show the influence of solvent, gas quality and coating procedure on the quality of the coating. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coating, drying, particle, fluidization, Wurster
in
Chemical Engineering Science
volume
60
issue
16
pages
4647 - 4653
publisher
Elsevier
external identifiers
  • wos:000230077800021
  • scopus:19344368070
ISSN
0009-2509
DOI
10.1016/j.ces.2005.03.026
language
English
LU publication?
yes
id
ccb012c6-6740-4ca4-b82d-4106f71e00a3 (old id 235891)
date added to LUP
2007-08-06 09:52:40
date last changed
2017-07-09 04:24:47
@article{ccb012c6-6740-4ca4-b82d-4106f71e00a3,
  abstract     = {A new device for coating a single levitated particle in a controllable environment is designed and tested. This enables fluidized bed processing to be simulated experimentally on a single-particle level. The device consists of a coating chamber, which contains a capillary tube for levitating the particle, a micro-dispenser for producing discrete drops of controlled size and velocity and a device for supplying gas with specified temperature and humidity. The coating chamber consists of two parts, a confined space where the particle is levitated and a droplet insertion cone where the coating solution is injected into the particle suspending gas flow. A capillary with a well-defined diameter connects the droplet insertion cone and the area where the particle is levitated. The device is equipped with a piezo-actuated flow-through micro-dispenser that has the ability to produce discrete droplets with high reproducibility in terms of droplet size and velocity. The gas required for the coating process is taken from a gas container where the water content is analysed and kept at a minimum. A liquid flow is then introduced into the gas flow at a well-defined flow rate, mixed and evaporated in a three-way mixing vault. The humidified gas flow is then split into two separate flows; a suspending gas flow and a protecting gas flow for the inside of the coating chamber. The device is equipped with a high-speed video camera for monitoring both droplet production and droplet impact. Temperatures and flow rates throughout the device are measured and logged. Preliminary results show the influence of solvent, gas quality and coating procedure on the quality of the coating.},
  author       = {Strom, D and Karlsson, S and Folestad, S and Bjorn, I N and Laurell, Thomas and Nilsson, Johan and Rasmuson, A},
  issn         = {0009-2509},
  keyword      = {coating,drying,particle,fluidization,Wurster},
  language     = {eng},
  number       = {16},
  pages        = {4647--4653},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {A new device for coating single particles under controlled conditions},
  url          = {http://dx.doi.org/10.1016/j.ces.2005.03.026},
  volume       = {60},
  year         = {2005},
}