THE LIGHT SCATTERING BEHAVIOUR OF THORIUM ARSENATE GEL-FORMING SYSTEMS

The changes in the depolarisation and the intesity of transversely scattered light and opacity of thorium arsenate gels, obtained by diluting acid solution of thorium arsenate, have been investigated. The results show that the colloidal particles formed by diluting acid solution of thorium arsenate become hydrated and the gels are formed. During gelation there are no changes in the size and shape of the particles. The gel particles, which are anisotropic and comparable with the wave-length of light used, seem to be disc-shaped.