Effects of the agglomerated states and the gap of coverage for admixed particles on particle-bed packing fractions

Mikio Yoshida, Hiroaki Yamamoto, Jun Oshitani, Kuniaki Gotoh

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish
Pages (from-to)560-564
Number of pages5
JournalAdvanced Powder Technology
Volume24
Issue number2
DOIs
Publication statusPublished - Mar 2013

Fingerprint

Silicon Dioxide
Silica
Scanning electron microscopy
Axial compression
Mortar

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 journalArticle

@article{d35417a254c940daacb05ceae06a765d,
title = "Effects of the agglomerated states and the gap of coverage for admixed particles on particle-bed packing fractions",
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.",
keywords = "Admixture of nano-particle, Packing fraction, Silica particle, Surface image analysis",
author = "Mikio Yoshida and Hiroaki Yamamoto and Jun Oshitani and Kuniaki Gotoh",
year = "2013",
month = "3",
doi = "10.1016/j.apt.2013.01.004",
language = "English",
volume = "24",
pages = "560--564",
journal = "Advanced Powder Technology",
issn = "0921-8831",
publisher = "Elsevier BV",
number = "2",

}

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

VL - 24

SP - 560

EP - 564

JO - Advanced Powder Technology

JF - Advanced Powder Technology

SN - 0921-8831

IS - 2

ER -