Abstract
The adhesion of zinc sulfide particles to silicon plates in the presence of aqueous solutions of several electrolytes, NaCl, MgCl2, and LaCl3, has been studied. The results are discussed in the light of the extended DLVO approach, in terms of energy-balance plots versus the distance between the interacting surfaces. Moreover, we were also interested in finding out whether high-frequency (43 MHz) electric field pretreatment of the surface influenced the adhesion process. The adhesion of ZnS was quite dependent on the NaCl concentration, being higher as the concentration of NaCl was increased. The effect of applying a radio frequency (RF) electric field during the adhesion process was only noticeable at the lowest NaCl concentration studied (0.1 mM). RF pretreatment in such conditions reduced the adhesion of ZnS to Si. The type of counterion in the solution determined the surface properties of both the adherent and the substrate. The results using 1 mM NaCl, MgCl2, and LaCl3 aqueous solutions showed that th...
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