Preparation of Standard Fine Particles for Study of Stability and %lectrophoretic mobilityy

同时测定了两种聚合物乳胶悬浮液(样品A；Styence/Nass共聚乳液，样品B；两性聚合物乳液)上的Zeta(&lt；Zeta&gt；)-电位絮凝浓度(c.f.c)，以制备标准的细颗粒悬浮液，并找出这些技术中存在的问题。所有实验室的数据似乎彼此相当吻合，但升高的电势使样品B的等电点附近的pH曲线的斜率增大。用静态法同时测定了样品A中的KNO_3、Mg(NO_3)_3、La(NO_3)_2和La(NO_3)_3，并与动态法和动态光散射法测定的结果进行了比较。技术。到岸价的值的顺序。静态法、L.S.技术、动态法。此外，还认识到在测定C.f.c.时，介质中的固体浓度起着有效的作用。

Simultaneous mesurements of zeta(<zeta>)-potentical flocculation concentration(c.f.c) on two polymer latex suspensions(Sample-A; Styrence/Nass copolymer latices, Sample-B; Amphoteric.polymer latices) were carried out to prepare a standard fine particle suspension and to find out the problem in these techniques.The <zeta>-potential measurements were carried out in nine laboratories using the different electrophoretic apparatus which involved a Rank Brother M-2, a Pen Kem-501, a Pen Kem-3000 and a Malvern Zetasizer-F. it appears that the data from all the laboratiories are in fairly agreement with each other, but an elevated potential supply tends to increase the slope of the <zeta> vs. pH curve near the isoelectric point of Sample-B.The c.f.c. of KNO_3, Mg(NO_3)_3 and La(NO_3)_2 and La(NO_3 )_3 on Sample-A, was determined simultaneously by a static method and the results ware compared with the value determined by the Kinetic method and the dynamic light scattering(L.S.) technique. The sequence of the value of c.f.c. is as follows; static method <L.S. technique <kinetic method. Furthermore, it is realized that in determinig the c.f.c., the solid concentration in the medium plays an effective role.