対イオン濃度の異なる高濃度アルミナスラリー中での高分子分散剤による相互作用の原子間力顕微鏡を用いた解析

• 福田 悦幸

  東京農工大学大学院生物システム応用科学研究科

• 冨樫 恒隆

  東京農工大学大学院生物システム応用科学研究科

• 内藤 牧男

  (財) ファインセラミックスセンター (JFCC)

• 神谷 秀博

  東京農工大学大学院生物システム応用科学研究科

書誌事項

タイトル別名

• Analysis of Electrosteric Interaction of Polymer Dispersant in Dense Alumina Suspensions with Different Counter-Ion Densities Using an Atomic Force Microscope.

抄録

The mechanism of anionic polymer dispersant acting on dense alumina suspension behavior was analyzed under different solid-volume fractions (ranging from 40 to 55vol%) and counter-ion densities by comparing microscopic solid/liquid interface interaction to suspension viscosity. The solid/liquid interface interaction and adsorbed structure of polymer dispersant on particles were determined by an atomic force microscope (AFM). The dependency of counter-ion density on the suspension viscosity appeared at a relatively low solidvolume fraction (40vol%). However, at a high solid-volume fraction (50vol%), the suspension viscosity was independent of the counter-ion density. To analyze these phenomena, the force curves between a polished surface of alumina and the tip of AFM were measured in solution with polymer dispersant and different counter-ion densities. The increase of counter-ion density reduced the long-range overlapping repulsive force of an electrical double layer ranging over 10nm in surface distance. A short-range steric repulsion force ranging below about 5nm in surface distance slightly depended on counter-ion density. The estimated mean surface distance between particles in dense suspension decreased from about 8 to 4nm with increasing the solid fraction from 40 to 50vol%. Based on both results, it is concluded that the main mechanism for the aggregation/dispersion of alumina powder in dense suspension changed from electrostatic repulsive force to steric force with increasing the solid-volume fraction in suspension.

収録刊行物

• Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)

  Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 109 (1270), 516-520, 2001

  公益社団法人 日本セラミックス協会

キーワード

• Alumina
• Polymer dispersant
• Suspension
• Solid volume fraction
• Counter-ion density
• Electrosteric interaction
• AFM

詳細情報

• CRID: 1390001205249838848
• NII論文ID: 110002288858
• NII書誌ID: AN10040326
• DOI: 10.2109/jcersj.109.1270_516
• COI: 1:CAS:528:DC%2BD3MXksFOqu74%3D
• ISSN: 18821022
• ISSN: 09145400
• ISSN: http://id.crossref.org/issn/09145400
• NDL書誌ID: 5796223
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5796223
• Web Site: http://www.jstage.jst.go.jp/article/jcersj1988/109/1270/109_1270_516/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可