Author
Xiaowen Liu
Bio: Xiaowen Liu is an academic researcher from Central South University. The author has contributed to research in topics: Surface energy & Wetting. The author has an hindex of 3, co-authored 4 publications receiving 241 citations.
Topics: Surface energy, Wetting, Contact angle, Surface roughness, Adsorption
Papers
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TL;DR: Anisotropic surface broken bond densities and surface energies of six surfaces of scheelite were calculated with density functional theory (DFT) as discussed by the authors, and the calculation results show that its surface energy is directly proportional to its surface broken-bond density.
138 citations
TL;DR: Anisotropic surface broken bond densities of six different surfaces of calcite and three surfaces of fluorite were calculated and the commonly exposed surfaces of the two minerals were predicted and the relations between surface broken bonds densities and surface energies were analyzed as mentioned in this paper.
89 citations
TL;DR: In this article, the surface roughness and appearance of different predominantly exposed surfaces of scheelite crystals were investigated using AFM, and the surface energies evaluated directly correspond to the trend calculated with DFT.
70 citations
TL;DR: In this paper, a three-dimensional graphene aerogel with different weight of Ag particles (N-GA/Ag) was successfully prepared by a one-step solvothermal method.
11 citations
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01 Jan 2011
TL;DR: In this article, shape and size controlled synthesis of Ag nanoparticles is used to show that silver nanocubes exhibit higher selectivity than nanowires and nanospheres for a given shape, larger particles offer improved selectivity.
Abstract: Catalytic selectivity in the epoxidation of ethylene to form ethylene oxide on alumina-supported silver catalysts is dependent on the geometric structure of catalytically active Ag particles and reaction conditions. Shape and size controlled synthesis of Ag nanoparticles is used to show that silver nanocubes exhibit higher selectivity than nanowires and nanospheres. For a given shape, larger particles offer improved selectivity. The enhanced selectivity toward ethylene oxide is attributed to the nature of the exposed Ag surface facets; Ag nanocubes and nanowires are dominated by (100) surface facet and Ag nanospheres are dominated by (111). Furthermore, the concentration of undercoordinated surface sites is related to diminished selectivity to ethylene oxide. We demonstrate that a simple model can account for the impact of chemical and physical factors on the reaction selectivity. These observations have also been used to design a selective catalyst for the ethylene epoxidation reaction.
165 citations
TL;DR: In this paper, the authors studied the flotation separation of scheelite from calcite using sodium oleate as collector and acidified sodium silicate as depressant and showed that the use of acidified salt as a depressant can achieve a 3:1 ratio of the ratio of oxalic to salt.
157 citations
TL;DR: Froth flotation of scheelite has regained new focus since the 2010s and research regarding floatability and reagents has made great progress over the years as discussed by the authors. But due to similar properties, most attempts have limited success or only specific application (linked to a type of ore or a location).
Abstract: Froth flotation of scheelite has regained new focus since the 2010s and research regarding floatability and reagents has made great progress over the years. The main objective was and remains the selective flotation of scheelite from other calcium-bearing minerals, in particular calcite, fluorite and apatite. Due to similar properties, most attempts have limited success or only specific application (linked to a type of ore or a location). This article aims at reviewing all general physical-chemical information on froth flotation of scheelite, including electrokinetic properties, influence of pH and already existing reagents as well as ones still under examination. It appears that chelating or mixed collectors and modified versions of sodium silicate and quebracho hold great promise for scheelite flotation, while the use of said depressants and/or promoters seems inevitable.
145 citations
TL;DR: In this article, a new collector, lead complexes of benzohydroxamic acid, was found to be selective for the separation of scheelite and calcium minerals with little water glass, and a novel flotation process was developed for the recovery of tungsten minerals in Shizhuyuan Mine in China.
143 citations
TL;DR: In this paper, the effect of sodium alginate on the flotation separation of scheelite from calcite and fluorite using sodium oleate as collector was investigated using zeta potential measurements, contact angle measurements and FTIR.
130 citations