Studies of Ordered Monodisperse Polystyrene Latexes. I. Shear Ultrasonic Measurements
Studies of Ordered Monodisperse Polystyrene Latexes. I. Shear Ultrasonic Measurements
复制标题
有序单分散聚苯乙烯乳胶的研究。
DOI：
10.1143/jjap.17.305
复制
发表时间：
1978
影响因子：
1.5
通讯作者：
K. Okano
中科院分区：
文献类型：
--
作者：
S. Mitaku;T. Ohtsuki;K. Enari;A. Kishimoto;K. Okano
用扭转石英晶体法在70 kHz下测定了单分散聚苯乙烯胶乳的刚性G和粘度η，发现在胶乳的有序-无序转变处G和η发生突变。改进了扭振石英晶体法，使之适用于含水导电样品的测量，并进行了仔细的标定，结果表明，只要已知样品的介电常数，就可以得到G和η。在有序状态下（体积浓度为9.3%），胶乳的表观刚性G约为1.5×103 dyne/cm ~ 2，粘度η约为0.6cp;而在无序状态下，胶乳的表观刚性G较小，粘度η约为0.95cp。有序胶乳是由屏蔽库仑排斥作用形成的“晶体”，不仅是晶体的良好模型，而且也是某些生物体系中有序结构的良好模型。
The rigidity G and the viscosity η of monodisperse polystyrene latexes were measured by the torsional quartz crystal method at 70 kHz, and an abrupt change in G and η was found at the order-disorder transition of the latexes. The torsional quartz crystal method was improved for measurements with aqueous conductive samples, and a careful calibration showed that G and η are obtained if the dielectric constant of the sample is known. In the ordered state of latex with a volume concentration of 9.3%, the apparent rigidity G and the viscosity η were about 1.5×103 dyne/cm2 and 0.6 cp, respectively, while in the disordered state G was small and η was 0.95 cp. Ordered latex is a “crystal” formed by the screened Coulomb repulsion and is a good model not only for crystals but also for ordered structures in some biological systems.