Particle Structure and Stability of Colloidal Dispersions as Probed by the Kossel Diffraction Technique

✍ Scribed by Wen Xu; Alex Nikolov; Darsh T. Wasan; Alex Gonsalves; Rajendra P. Borwankar

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 218 KB
• Volume: 191
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.4977

✦ Synopsis

tion, indicating that more ordered particle structuring occurs A nondestructive Kossel diffraction technique based on the prininside colloidal dispersions. More detailed investigations ciple of back-light scattering was used to characterize the structure were made by several other groups through analysis of the formation which results from the interparticle interactions in col-Kossel lines produced by light rays back-scattered at the loidal dispersions. Static structure factors, radial distribution func-Bragg angle. Dubois-Violette et al. (3) used this technique tions, and average pair potentials, which characterize the particle to determine the elastic modules of the latex crystal. Ackerpacking structures in model systems of hydroxylate latex disperson and Clark (4) investigated crystal deformation under sions, were obtained. The effects of particle concentration and shear. They found that when the dispersions of charged polydispersity on particle structuring and dispersion stability were spherical colloidal particles were subjected to an increasing also studied. Computer simulations based on the Ornstein-Zernike method were compared with the experimental results. Good shear rate, the particle structure exhibited a reversible orderquantitative agreement was observed. ᭧ 1997 Academic Press disorder transition and became an amorphous structure at Key Words: particle structure; colloidal dispersion; stability; high shear rates. Tomita et al. (5) presented a more detailed light scattering; Kossel diffraction; hard sphere. discussion of Kossel diffraction phenomena. In their research, an ordered latex in a cell covered by a flat glass plate was normally illuminated by a laser beam, and a hexagonal