Analysis of a polydisperse system using small-angle X-ray scattering |
| |
Authors: | Bo Sjöberg Ragnar Österberg |
| |
Institution: | (1) Department of Medical Biochemistry, University of Göteborg, S-400 33 Göteborg, Sweden |
| |
Abstract: | The small-angle X-ray data from a polydisperse solution of sodium silicate have been measured in the concentration range 3.6–169 mg/cm3 using aKratky camera. The following values of the particle parameters were obtained: the average radius of gyration =7.5 nm, the average particle weight =900 000, the average volume =671 nm3, and the average particle surface area =717 nm2.From the above parameters and the apparent specific volume, analysed to be 0.422 cm3/g, the water content of the silicate particles was determined to be 3% (by weight).From small-angle X-ray measurements, performed on solutions exposed to a hydrodynamic field, it is indicated that at least the larger particles in the solution have a relatively symmetric shape. Based on this observation it was assumed that the particles in solution are spherical, and particle size distribution functions were calculated using a least-squares program. It was found that the distribution cannot be described by a simple function, such as aGaussian function; instead, the distribution follows a histogram with three local maxima.Dedicated to Prof. Dr. Dr.Otto Kratky, Graz, on the occasion of his 80th birthday. |
| |
Keywords: | Distribution functions Flow orientation Polydisperse system Least-squares analysis Small-angle X-ray scattering Sodium silicate |
本文献已被 SpringerLink 等数据库收录! |
|