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| 2. |
- Qin, Tao, 1984-, et al.
(författare)
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A general strategy for template-free and low-cost synthesis of inorganic hollow spheres
- 2017
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Ingår i: Powder Technology. - : Elsevier BV. - 0032-5910 .- 1873-328X. ; 319, s. 163-171
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Tidskriftsartikel (refereegranskat)abstract
- Inorganic hollow spheres have a great potential in many fields, such as calcium phosphate (Ca3(PO4)2) as carriers of active ingredients and local delivery. They are typically synthesized by the methods that reply on template-based strategies. However, the template residue and energy consumption during template removal are drawbacks. Currently developed template-free methods remain challenges such as time, cost and complicated procedures. In this paper, we introduce a general low-cost and template-free precipitation method with simple procedure. A series of inorganic hollow spheres, including calcium phosphate, calcium fluoride, strontium phosphate, strontium fluoride, barium phosphate and barium fluoride via magnesium were successfully synthesized, respectively. Based on these experimental results, a new model is proposed to explain the mechanism of the hollow inorganic spheres formation. This paper provides a general method to synthesize inorganic hollow spheres, which may have an important indication to other systems.
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| 3. |
- Qin, Tao, 1984-, et al.
(författare)
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A novel method to synthesize low-cost phosphate-based particles from natural water
- 2017
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Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 206, s. 178-181
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Tidskriftsartikel (refereegranskat)abstract
- Calcium phosphate (CaP) and magnesium phosphate (MgP) are widely used as biomaterials. A novel method for low-cost manufacturing of calcium phosphate spheres and magnesium phosphate micro particles was studied. The method focuses on novel strategies of utilizing seawater and lake water. In the natural water, the molar ratios of Mg/Ca are constant. The morphologies of the particles are determined by ratio of Ca/P. This simple method provides a prototype to synthesize low-cost inorganic spheres with natural water, which facilitate large-scale production.
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| 4. |
- Qin, Tao, 1984-, et al.
(författare)
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Template-free synthesis of phosphate-based spheres via modified supersaturated phosphate buffer solutions
- 2017
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Ingår i: Journal of materials science. Materials in medicine. - : SPRINGER. - 0957-4530 .- 1573-4838. ; 28:7
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Tidskriftsartikel (refereegranskat)abstract
- Modified supersaturated phosphate buffer solutions were used to synthesize phosphate-based spheres, including calcium phosphate (CaP), strontium phosphate (SrP) and barium phosphate (BaP). A series of ions concentrations in the modified phosphate buffer solutions were investigated in order to study their effects in precipitates morphologies. During synthesis, it was found that magnesium was the key factor in sphere formation. The morphologies of calcium phosphate, strontium phosphate and barium phosphate precipitates varied as the concentration of magnesium ions varied. When sufficient magnesium was provided, the precipitates appeared spherical, and the diameter was in range of 0.5-2 mu m. The morphologies, compositions and structure of spheres were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N-2 adsorption analysis. Moreover, the application of magnesium substituted calcium phosphate spheres in dentin tubules occlusion was investigated.
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| 5. |
- Qin, Tao, 1984-, et al.
(författare)
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The formation of calcium fluoride microspheres via solubility equilibrium
- 2017
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Ingår i: Ceramics International. - : ELSEVIER SCI LTD. - 0272-8842 .- 1873-3956. ; 43:16, s. 14521-14524
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Tidskriftsartikel (refereegranskat)abstract
- The focus of this study is on synthesis and mechanism of calcium fluoride (CaF2) spheres. Magnesium is the decisive factor in the formation of the spheres. The solubility product constant of Mg1-xCaxF2 is higher than those of CaF2 and MgF2. The structure of particles evolved to being spherical due to solubility equilibrium. The calcium fluoride spheres have great potential as dental materials in bleaching products.
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