Cs0.32WO3 particles are cesium tungsten bronze nanoparticles, which may be said to be a transparent thermal insulation nanopowder. And their particle size is similar to that of colloidal particles. Therefore, the stability theory of colloids, such as DLVO theory, can be used to study the dispersion stability of cesium tungsten bronze nano particles. So what is the DLVO theory?
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The DLVO theory is the theory of charged colloidal particle stabilization, which was proposed in 1941. There is electrical double-layer repulsion and van der Waals attraction between the colloidal particles. If the repulsion potential energy between the particles is numerically larger than the suction potential energy, it can prevent the particles from colliding with each other due to Brownian motion, and the colloid will be in a relatively stable state. If the suction potential energy value is greater than the repulsion potential energy, the particles will approach each other and coagulate. The addition of electrolyte to the colloid has a significant effect on the repulsion potential energy. A suitable electrolyte can increase the surface charge of the colloidal particles, form a stable electrical double-layer, and repel the repulsion between the particles to achieve colloidal stability. Therefore, a suitable electrolyte can be used to obtain a relatively stable colloid.
