a One common method of preventing rigid cohesion of small particles of a suspension is intentional formation of a less rigid or loose aggregation of the particles held together by comparatively weak particle-to- particle bonds. a Such an aggregation of particles is termed a floc or a floccule
◼ One common method of preventing rigid cohesion of small particles of a suspension is intentional formation of a less rigid or loose aggregation of the particles held together by comparatively weak particle-toparticle bonds. ◼ Such an aggregation of particles is termed a floc or a floccule
絮凝与反絮凝 向混悬剂中加入电解质,?电位降低到一定 程度后,混悬剂中的微粒形成疏松的絮状 聚集体的过程称为絮凝,加入的电解质称 为絮凝剂。 向絮凝状态的混悬剂中加入电解质,使絮 凝状态变为非絮凝状态的过程称为反絮凝, 加入的电解质称为反絮凝剂
絮凝与反絮凝 ◼ 向混悬剂中加入电解质，ζ电位降低到一定 程度后，混悬剂中的微粒形成疏松的絮状 聚集体的过程称为絮凝，加入的电解质称 为絮凝剂。 ◼ 向絮凝状态的混悬剂中加入电解质，使絮 凝状态变为非絮凝状态的过程称为反絮凝， 加入的电解质称为反絮凝剂
The flocs settle to form a higher sediment volume than unflocculated particles the loose structure of which permits the aggregates to break up easily y and distribute readily with a small amount of agitation
The flocs settle to form ◼ a higher sediment volume than unflocculated particles, the loose structure of which permits ◼ the aggregates to break up easily ◼ and distribute readily with a small amount of agitation
There are several methods of preparaing flocculated suspensions For an oral suspension of drug, clays such as diluted bentonite magma(皂土乳浆) are commonly employed In a parenteral suspension, frequently a floc of the dispersed phase can be produced by an alteration in the ph of the preparation
There are several methods of preparaing flocculated suspensions, ◼ For an oral suspension of drug, clays such as diluted bentonite magma （皂土乳浆） are commonly employed. ◼ In a parenteral suspension, frequently a floc of the dispersed phase can be produced by an alteration in the pH of the preparation
a Electrolytes can also act as flocculating agents. a The carefully determined concentration of surfactants can also induce flocculation of particles in suspension and increase the sedimentationⅴ olume
◼ Electrolytes can also act as flocculating agents. ◼ The carefully determined concentration of surfactants can also induce flocculation of particles in suspension and increase the sedimentation volume