Characterization of rod-shape magnetic particles by Sedimentation Field-Flow Fractionation and electron microscopy: Particle size and length distribution

Young Hun Park, Dai Woon Lee, Myeong Hee Moon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Sedimentation Field-Flow Fractionation (SdFFF) has been applied to the size characterization of nonspherical, rod shaped chromium dioxide particles which are currently being used as magnetic recording media. Retention of the rod shaped particles in SdFFF was largely dependent on flow rates and external field strengths. To obtain an accurate size distribution profile, a proper run condition was chosen at which retention of rods follows the SdFFF theory. While retention of rods at a high field strength was decreased by the role of lift forces, it was shown that retention at a low field strength was increased by the restricted diffusion of rod like particles. At an optimum run condition, where no retention perturbations existed, an apparent diameter distribution of rods was easily obtained and then converted to a length distribution with the application of the average cross-section diameter of rod shaped chromium dioxide particles measured by microscopy.

Original languageEnglish
Pages (from-to)133-145
Number of pages13
JournalInstrumentation Science and Technology
Volume25
Issue number2
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

Fractionation
electron microscopy
particle size distribution
Sedimentation
fractionation
flow field
Electron microscopy
Flow fields
flow distribution
rods
Particle size
particle size
sedimentation
microscopy
Chromium
Magnetic recording
field strength
chromium
dioxides
Microscopic examination

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Instrumentation
  • Environmental Science(all)

Cite this

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abstract = "Sedimentation Field-Flow Fractionation (SdFFF) has been applied to the size characterization of nonspherical, rod shaped chromium dioxide particles which are currently being used as magnetic recording media. Retention of the rod shaped particles in SdFFF was largely dependent on flow rates and external field strengths. To obtain an accurate size distribution profile, a proper run condition was chosen at which retention of rods follows the SdFFF theory. While retention of rods at a high field strength was decreased by the role of lift forces, it was shown that retention at a low field strength was increased by the restricted diffusion of rod like particles. At an optimum run condition, where no retention perturbations existed, an apparent diameter distribution of rods was easily obtained and then converted to a length distribution with the application of the average cross-section diameter of rod shaped chromium dioxide particles measured by microscopy.",
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