Water Emulsions of Dibutyl Xanthate and Their Interaction with the Surface of Highly Oriented Pyrolytic Graphite and Silicon Dioxide
A. A. KARACHAROV, M. N. LIKHATSKII, YU. L. MIKHLIN
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50, Bld. 24, Krasnoyarsk, 660036 Russia
Keywords: aлотация, дибутилдиксантоген, микроэмульсия, адсорбция, атомно-силовая спектроскопия, динамическое рассеяние света, дзета-потенциал, капиллярные силы, газовые нанопузыри, flotation, dibutyl xanthate, micro-emulsion, adsorption, atomic-force microscopy, dynamic light scattering, zeta potential, capillary forces, gas nano-bubbles
Abstract
Water micro-emulsions of dibutyl xanthate as an active compound of commercial manufacture flotation agent are produced and analyzed using the methods of dynamic light scattering and zeta potential measurements. It is found that the typical hydrodynamic diameter of xanthate drops is of the order of 300 nm and their zeta potentials are negative. The effect exerted on properties of hydrophobic (pyrolytic graphite) and hydrophilic (silicon dioxide) surfaces by pretreatment with the micro-emulsions is examined using the atomic-force microscopy method and colloid probe (SiO2 micro-sphere). The long-range high-amplitude attraction forces, probably of capillary nature, are revealed between the probe and surfaces after the contact with dixanthate for 1 min. It is supposed that these forces are conditioned by the action of gas nano-structures (nano-bubbles, nano-cavities, etc.) initiated on the surface rendered hydrophobic by dixanthate.
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