Naslov
Determination of Size of Small Particles by Light Scattering. Experiments on Ludox Colloidal Silica

Autori
Deželić, Gjuro ; Kratohvil, Josip P.

Izvornik
Kolloid-Zeitschrift (0368-6590) 173 (1960), 1; 38-48

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
light scattering ; small particles ; ludox colloidal silica

Sažetak
Four samples of Ludox colloidal silica were studied by the light transmission and angular scattering method and the size of particles determined. It was found essential for light scattering work to centrifuge the original Ludox solution in order to remove the aggregated material. After this treatment each Ludox sample regardless of age could be used successfully for calibration purposes. The apparent particle sizes in aqueous solutions of Ludox were smaller than those in 0.05 M NaCl solutions, the latter being in very good agreement with electron microscopic values, The refractive index increments of Ludox in water and 0.05 M NaCl were determined at three wavelengths. The influence of cell length and blackening of the cells in transmission measurements were also studied. Dissymmetries and depolarizations were small. All results indicated that particles of Ludox behave practically as Rayleigh seatterers. The usefulness of these results for the calibration of light scattering photometers is discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA