Abstract
One of the techniques used to decrease the cohesive force between particles is the admixing of nano-particles. However, the optimal conditions that will produce a minimum amount of force have not been established. In this study, we investigated the effects of the agglomerated state and the gap of coverage for admixed particles on particle-bed packing fractions in uni-axial compression. The main particles were made up of 397 nm silica particles. The admixed particles included 8, 21, 62 and 104 nm silica particles. The main and admixed particles were mixed using a mortar and pestle for 5 min for various mass ratios. SEM images were used to analyse the coverage diameter and the surface coverage ratio. As a result, the packing fractions with admixed particles of 8 and 21 nm were larger than when admixed particles were not used, and these admixed particles adhered onto the surface of the main particles as agglomerates. However, packing fractions of 62 and 104 nm were almost constant and were independent of the coverage states of admixed particles. Furthermore, these admixed particles with relatively larger diameters were adhered onto the surface as single particles. From the coverage diameter and actual surface coverage ratio obtained by the SEM image, the average gaps between agglomerates of 8 and 21 nm on the main particle were calculated. When the gap approached twice the size of the coverage diameter, packing fractions of 8 and 21 nm proved to be the maximum values. However, when the gap was less than the coverage diameter, the packing fractions deteriorated.
| Original language | English |
|---|---|
| Pages (from-to) | 560-564 |
| Number of pages | 5 |
| Journal | Advanced Powder Technology |
| Volume | 24 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Mar 2013 |
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Keywords
- Admixture of nano-particle
- Packing fraction
- Silica particle
- Surface image analysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanics of Materials
Cite this
Effects of the agglomerated states and the gap of coverage for admixed particles on particle-bed packing fractions. / Yoshida, Mikio; Yamamoto, Hiroaki; Oshitani, Jun; Gotoh, Kuniaki.
In: Advanced Powder Technology, Vol. 24, No. 2, 03.2013, p. 560-564.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of the agglomerated states and the gap of coverage for admixed particles on particle-bed packing fractions
AU - Yoshida, Mikio
AU - Yamamoto, Hiroaki
AU - Oshitani, Jun
AU - Gotoh, Kuniaki
PY - 2013/3
Y1 - 2013/3
N2 - One of the techniques used to decrease the cohesive force between particles is the admixing of nano-particles. However, the optimal conditions that will produce a minimum amount of force have not been established. In this study, we investigated the effects of the agglomerated state and the gap of coverage for admixed particles on particle-bed packing fractions in uni-axial compression. The main particles were made up of 397 nm silica particles. The admixed particles included 8, 21, 62 and 104 nm silica particles. The main and admixed particles were mixed using a mortar and pestle for 5 min for various mass ratios. SEM images were used to analyse the coverage diameter and the surface coverage ratio. As a result, the packing fractions with admixed particles of 8 and 21 nm were larger than when admixed particles were not used, and these admixed particles adhered onto the surface of the main particles as agglomerates. However, packing fractions of 62 and 104 nm were almost constant and were independent of the coverage states of admixed particles. Furthermore, these admixed particles with relatively larger diameters were adhered onto the surface as single particles. From the coverage diameter and actual surface coverage ratio obtained by the SEM image, the average gaps between agglomerates of 8 and 21 nm on the main particle were calculated. When the gap approached twice the size of the coverage diameter, packing fractions of 8 and 21 nm proved to be the maximum values. However, when the gap was less than the coverage diameter, the packing fractions deteriorated.
AB - One of the techniques used to decrease the cohesive force between particles is the admixing of nano-particles. However, the optimal conditions that will produce a minimum amount of force have not been established. In this study, we investigated the effects of the agglomerated state and the gap of coverage for admixed particles on particle-bed packing fractions in uni-axial compression. The main particles were made up of 397 nm silica particles. The admixed particles included 8, 21, 62 and 104 nm silica particles. The main and admixed particles were mixed using a mortar and pestle for 5 min for various mass ratios. SEM images were used to analyse the coverage diameter and the surface coverage ratio. As a result, the packing fractions with admixed particles of 8 and 21 nm were larger than when admixed particles were not used, and these admixed particles adhered onto the surface of the main particles as agglomerates. However, packing fractions of 62 and 104 nm were almost constant and were independent of the coverage states of admixed particles. Furthermore, these admixed particles with relatively larger diameters were adhered onto the surface as single particles. From the coverage diameter and actual surface coverage ratio obtained by the SEM image, the average gaps between agglomerates of 8 and 21 nm on the main particle were calculated. When the gap approached twice the size of the coverage diameter, packing fractions of 8 and 21 nm proved to be the maximum values. However, when the gap was less than the coverage diameter, the packing fractions deteriorated.
KW - Admixture of nano-particle
KW - Packing fraction
KW - Silica particle
KW - Surface image analysis
UR - http://www.scopus.com/inward/record.url?scp=84876140051&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876140051&partnerID=8YFLogxK
U2 - 10.1016/j.apt.2013.01.004
DO - 10.1016/j.apt.2013.01.004
M3 - Article
AN - SCOPUS:84876140051
VL - 24
SP - 560
EP - 564
JO - Advanced Powder Technology
JF - Advanced Powder Technology
SN - 0921-8831
IS - 2
ER -