Electrooptical effects in colloid systems subjected to short pulses of strong electric field

Abstract

Existing electrooptical experimental techniques applied to a colloid solution allow the determination of different particle parameters, such as rotary diffusion coefficient, size, polarizability anisotropy and others. If the solution is polydisperse, numerical methods can be used to determine the distribution of particles in the solution on their parameters. These techniques can be applied to systems that are prone to lengthy application of electric field. To study polydisperse systems that cannot stand lengthy application of electric field it is proposed to apply short pulses of strong sine-shaped electric field. It is shown that it is still possible to determine the main particle parameters from the experimental data obtained in this technique. The limitations of this approach are studied. This technique was experimentally probed on aqueous colloid solutions of diamond, graphite and palygorskite. It is shown that for these systems the relaxation of the electrooptical effect after application of strong pulses of sine-shaped electric field is similar to the relaxation of the electrooptical effect from the state of saturated orientation induced by sine-shaped electric field, which is proven by the presented correlation coefficients.

Электрооптический Метод Исследования Коагуляции Нанодисперсных Систем. Образование Агрегатов Частиц Графита В Водных Электролитах

“…которое можно экспериментально проверить, учитывая соотношение (11). Здесь n 0 -концентрация частиц до начала коагуляции, T C -период коагуляции.…”

“…Аналогичные возможности предоставляют и электрооптические методы. Электрооптические измерения могут занимать крайне малое время (менее 1 min), а релаксационные зависимости электрооптических эффектов могут быть использованы для определения функции распределения частиц и их агрегатов по размерам [10][11][12], которые меняются в процессе коагуляции. Это позволяет про-водить исследования в быстро коагулирующих системах.…”

Scientific Substantiation of the Methodology of Preparation of Quince Japanese for Analysis and Investigation of Consumer Properties of the Products of Its Recycling

“…For determining the quality of the research objects and their component composition, it was offered to introduce an operation of preliminary preparation, in which result the studied raw material must look as a homogenous system at the expanse of its disintegration in liquid and solid phases. For separating a liquid phase from a solid one, different methods may be used, such as filtration, pressing, centrifuging and sedimentation [10].…”