Complicated Flow Behavior of Silica Particles in Concentrated Slurry

Tanaka, Satoshi; Nagasawa, Yoshihiro; Kato, Zenji

doi:10.4164/sptj.53.294

Cited by 1 publication

(1 citation statement)

References 18 publications

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“…These slurries were made transparent by matching the refractive indices of the silica particles and the liquid medium to suppress light reflection at the interface of the silica particles and the liquid medium. 50,51 We observed the slurries using confocal laser scanning fluorescent microscopy (CLSFM) and added a dye exhibiting laser-induced fluorescence to the liquids so that the silica particles would appear as negatives in the obtained images. Using this technique, particles inside of high-concentration slurries could be analyzed by direct observation.…”

Section: Introductionmentioning

confidence: 99%

Particle sedimentation monitoring in high-concentration slurries

2016

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In this study, the sedimentation states of particles in high-concentration slurries were elucidated by monitoring their internal states. We prepared transparent high-concentration silica slurries by adjusting the refractive index of the aqueous glycerol liquid in which the particles were dispersed to match that of the silica particles. In addition, a fluorescent dye was dissolved in the liquid. Then, we directly observed the individual and flocculated particles in the slurries during sedimentation by confocal laser scanning fluorescent microscopy. The particles were found to sediment very slowly while exhibiting fluctuating motion. The particle sedimentation rate in the high-concentration slurry with the aqueous glycerol solution (η=0.068Pa·s) and a particle volume fraction on the order of 0.3 was determined to be 1.58 ± 0.66 μm·min−1 on the basis of the obtained image sequences for 24.9 h. In-situ observation provides a large amount of information about the sedimentation behavior of particles in condensed matter.

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Section: Introductionmentioning

confidence: 99%