• 作者： Tseng, Shiojenn; Hsu, Jyh-Ping; Lin, Der-Po
• 中文摘要： 本文探討了在一剪流場中受高分子引發的絮聚現象中穩定比率的時變行為。傳統分析中皆假設高分子對膠體粒子之吸附速率比膠體粒子間之碰撞速率快得多。換言之,絮聚在吸附未達穩態前可以忽略。我們延伸了傳統的分析,考慮當該假設不成立時膠體粒子之穩定比率的變化。我們發現,穩定比率與粒子表面上之總吸附位置數與高分子分子數之比值有密切的關係。視該比值之大小,穩定比率可能的變化情形有:(1)隨時間遞減至一穩態值,(2)先隨時間遞減,通過一最小值,然後遞增至一穩態值。另外,在一般的操作條件下,穩定比率對膠體表面電位的變化不敏感,而主要受控於粒子表面被高分子覆蓋的程度。
• 英文摘要： The temporal variation of the stability ratio in polymer-induced flocculation occurring in a shear-flow field is examined theoretically. The present study extends the conventional analysis in that the transient behavior of the adsorption of polymer molecules onto the surfaces of colloidal particles is taken into account. The interaction forces between colloidal particles including hydrodynamic force, electrical double-layer force, and van der Waals force have been considered. Depending upon the ratio (number of active sites on polymer molecules/number of sites on colloidal surfaces), the stability ratio may decrease monotonically with time to a steady-state value, or may decrease in the early stage, passes through a minimum, and then increases to a steady-state value. Under conditions normally encountered, the variation in the stability ratio is insensitive to the variation in the surface potential of colloidal particles, and is mainly governed by the degree of surface coverage of colloidal particles by polymer molecules.
• 中文關鍵字： 穩定比率; 高分子吸附; 絮聚; 膠體粒子
• 英文關鍵字： Stability Ratio; Adsorption Of Polymer; Flocculation; Colloidal Particle