2016
DOI: 10.1021/acs.langmuir.6b01252
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Surface-Charge Anisotropy of Scheelite Crystals

Abstract: Atomic force microscopy was employed to measure the colloidal interactions between silicon nitride cantilever tips and scheelite crystal surfaces in 1 mM KCl solutions of varying pH. By fitting the Derjguin-Landau-Verwey-Overbeek (DLVO) theoretical model to the recorded force-distance curves, the surface-charge density and surface-potential values were calculated for three crystallographic surfaces including {112}, {101}, and {001}. The calculated surface-potential values were negative in both acidic and basic… Show more

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Cited by 89 publications
(35 citation statements)
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“…Therefore, measurement of contact angles on carefully selected and engineered (through polishing) mineral specimens is the only option to anyone who works on understanding of flotation fundamentals. 23 As mentioned earlier, characterization of a specimen's wetting requires polishing to a mirrorlike surface. 24 However, any research stemming toward the development of correlations between contact angles and flotation performance will also require preparation of specimen surface topography that reflects the surfaces of particles.…”
Section: Granulated Mineralsmentioning
confidence: 99%
See 1 more Smart Citation
“…Therefore, measurement of contact angles on carefully selected and engineered (through polishing) mineral specimens is the only option to anyone who works on understanding of flotation fundamentals. 23 As mentioned earlier, characterization of a specimen's wetting requires polishing to a mirrorlike surface. 24 However, any research stemming toward the development of correlations between contact angles and flotation performance will also require preparation of specimen surface topography that reflects the surfaces of particles.…”
Section: Granulated Mineralsmentioning
confidence: 99%
“…Such surfaces are typically not studied in mineral processing laboratories, as discussed in the next section. Although carefully selected (rarely as single crystals or cleaved specimens), 23 they are typically not chemically homogeneous.…”
mentioning
confidence: 99%
“…The Ca atom in bulk scheelite crystal is eightfold-coordinated to surrounding oxygens. Based on our early findings [40,54] that the atom with more dangling bonds is more active, the Ca atom on the {101} surface is more active than that on {001} surface, and has a higher interaction strength with organics, such as oleate. The atomic simulation results showed that a larger adsorption energy Figure 5.…”
Section: Xrd Measurement Resultsmentioning
confidence: 99%
“…The population values of F-REE bonds are larger than that of F-Ca and F-F bonds, indicating that the covalency of F-REE bond is larger and hence the covalency of fluorite crystal is improved. It is wide accepted that the atoms on the commonly exposed surfaces of fluorite present unsaturated bonds [39][40][41]. Accordingly, the exposed REE atoms on the fluorite surface with unsaturated bonds have a stronger interaction with oleate ions, i.e., the interaction between oleic acid and fluorite becomes stronger.…”
Section: Analysis Of the Mulliken Populationmentioning
confidence: 99%