分散系のレオロジー
スポンサーリンク
概要
- 論文の詳細を見る
Various colloidal systems including paints, printing inks, flour dough, clay paste, butters, powder bed etc. behave as substances showing very complicated mechanical properties. Their flow is non-Newtonian. Their specific viscosity-concentration relationships do not obey the Einstein law. They show thixotropy or rheopexy. Some powder systems appear as bodies showing dilatancy. Concentrated suspensions and emulsions behave as visco-elastic. The above-mentioned peculiar flow properties of colloidal suspensions and emulsions are characterized by various nonlinear nature and, from the structural point of view, formation of a scaffolding structure by the suspended or emulsified particles ; the structure, which is formed by weak secondary bond, is easily broken and regenerated in the field of flow. Some schemes of studying the complicated mechanical properties of colloidal disperse systems are discussed. One of the most classical methods of analysis is to describe their flow properties by a plastic yield value and plastic viscosity first proposed by Bingham. The concept of Bingham plasticity is conveniently applicable to the study of concentrated suspensions. Measurement of dynamic visco-elasticity of colloidal dispersions reveals the nature and the structural aspects of many rheological peculiarities. For example, spinnability or thread-forming property of some lyophile colloidal solutions is described as the superposed phenomena of viscous flow and elastic elongation. Description of their stress-strain-time behavior by the power law which was proposed by Nutting and Scott Blair makes an other way of studying rheology of pasty matters. Other schemes are of experimental nature. For example, it is recommendable to study the rheological properties of suspension of particles whose surface physico-chemical nature can be controlled by chemical treatment. Various synthetic latexes and suspensions of powders of ion-exchange resins are conveniently used as the model substances for the study of complicated rheological properties of colloids. Their surfaces are well-defined and easily controlled by chemical techniques.
- 社団法人日本材料学会の論文
- 1961-04-15
著者
関連論文
- 少量可塑性ポリ塩化ビニルにおける逆可塑化現象
- 濃厚溶液粘弾性の一測定方法 : 分散系のレオロジー : レオロジー特集号
- カードランのゲル化について
- ようかんのレオロジー : レオロジー一般
- 分散体のレオロジー
- 分散系のレオロジー
- 可塑化ポリ塩化ビニルの力学的性質
- レオロジー 変形と流れの科学
- ゴムとゴム弾性のドラマ
- 身の周りのレオロジー : 岩石から唾液まで(見直そうコロイド : 高校・大学一般教養のためのコロイドおよび界面化学)
- 9a-E-6 高分子物理学の回顧と展望
- 本をどう読むか(印象に残った一冊の本)
- 伸びる : ゴムの弾性(日常経験する物理・化学的現象のやさしい解説)
- タイトル無し