Particle size analysis and structure of chromium hydrous oxide sols in the size range of less than 0.5 μm

✍ Scribed by R. I. Larson; E. F. Fullam; A. D. Lindsay; E. Matijevic

• Book ID: 102692600
• Publisher: American Institute of Chemical Engineers
• Year: 1973
• Tongue: English
• Weight: 811 KB
• Volume: 19
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690190328

✦ Synopsis

Abstract

Particle size measurements of chromium hydrous oxide sols using electron microscopy and light scattering techniques were in excellent agreement. Comparison was based on the most probable diameter and width of the distribution. The normal, lognormal, and zero‐order logarithmic density functions provided good first‐order approximations to the particle size measurements. The chromium hydrous sols were less than 0.5 μm in size.

A closed wet cell specimen holder in an electron microscope was developed to observe, in situ, the chromium hydrous oxide sols. The colloidal particles had a uniform spherical shape with a narrow size distribution. Observation of the particle formation process in the closed wet cell qualitatively supports the mechanism that basic polymeric sulfates act as embryos in the formation of these particles.