Lin Louie’s research while affiliated with Cooper Union and other places

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Publications (1)


Fluidization and mixing of nanoparticle agglomerates assisted via magnetic impaction
  • Article

February 2013

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75 Reads

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19 Citations

Journal of Nanoparticle Research

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Daniel Lepek

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Lin Louie

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Rajesh N. Davé

Mixing of nanopowders in an environmentally benign magnetically assisted fluidized bed (MAFB) system was studied. Examination of fluidization behavior of agglomerate particulate fluidization (APF; silica R974 or R972) and agglomerate bubbling fluidization (ABF; alumina or titania) nano-powders in un-assisted and MAFB systems confirmed previous results on decreased minimum fluidization velocity and increased bed expansion of APF and ABF powders due to magnetic assistance. APF and ABF powder mixtures behaved like APF powders with the bed expansions in between those of individual constituents. Unlike previous MAFB studies, fluidization as a function of time was studied to examine its influence on nano-mixing. With time, the bed expansion reduced, and reduction was faster as magnet-to-powder ratio increased from 0:1 to 5:1, although fluidization was sustained, confirmed via the pressure drop measurements. Reduction in bed expansion was attributed to change in the nature of nanoagglomerates, which showed increased density as a function of processing time, ruling out electrostatics or elutriation as major factors. Mixtures of silica (APF) and alumina (ABF), processed at various magnet-to-powder ratios, were characterized via statistical analysis from energy dispersive x-ray spectroscopy using field emission scanning electron microscope to compute homogeneity of mixing (HoM). Magnetic assistance improved the HoM as a function of time, and was strongly related to the product of number of magnets and time, similar to previous results in magnetically assisted impaction mixing (MAIM). The best achievable HoM was significantly better than unassisted fluidization and comparable to previous results for rapid expansion of high-pressure suspensions and MAIM.

Citations (1)


... This results in uneven fluidization characterized by bubbles and channels in the fluidized bed. External forces exerted by mechanical stirrers, pulsed gas flow, admix of large magnetic particles, centrifugation, acoustic waves, microjets, impactor plates and vibration can be used to enhance the fluidization behavior of nanoparticles [6][7][8][9][10][11][12][13][14]. ...

Reference:

Mixing nanoparticles in a ProCell type spouted bed
Fluidization and mixing of nanoparticle agglomerates assisted via magnetic impaction
  • Citing Article
  • February 2013

Journal of Nanoparticle Research