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Zhenjiang, China

Ji Y.,Jiangsu University | Gao J.,Jiangsu University | Yin H.,Jiangsu University | Wang A.,Jiangsu University | And 3 more authors.
Journal of Nanoscience and Nanotechnology

Hollow silica microspheres with mesoporous shells were prepared by the sacrificial template method. Hollow silica microsphere-containing acrylate resin-based dental restoration materials were prepared by using hollow silica microspheres as NaF reservoirs. Fluoride release performances from naked hollow silica microspheres, acrylate resin, and hollow silica microsphere-containing acrylate resin-based dental restorative materials in an artificial saliva were investigated. The results showed that hollow silica microsphere-containing acrylate resin-based dental restorative materials had higher cumulative fluoride release quantities and sustained fluoride release rates than traditional acrylate resin-based dental restorative materials. Fluoride release could be tuned by changing the mesoporous shell thickness of hollow silica microsphere. Copyright © 2015 American Scientific Publishers All rights reserved. Source

Liu C.,Jiangsu University | Liu C.,Beihua University | Yin H.-B.,Jiangsu University | Wang A.-L.,Jiangsu University | And 5 more authors.
Transactions of Nonferrous Metals Society of China (English Edition)

Different-sized hollow SiO 2 spheres of 249-1348 nm in diameter were successfully prepared by using Na 2SiO 3 as the precursor and using polystyrene and polystyrene-methyl acrylic acid latexes as the templates. The diameter and shell thickness of the hollow SiO 2 spheres increase with increasing the latex template diameter at a given mass ratio of SiO 2 to latex template. The diameter and shell thickness of the hollow SiO 2 spheres also increase with increasing the mass ratios of SiO 2 to latex template. The presence of carboxylic acid groups on the surfaces of polystyrene-methyl acrylic acid latex templates favors the formation of dense and uniform SiO 2 shells. The hollow SiO 2 sphere is constructed by mesoporous shell with large specific surface area. When glyphosate is used as a release model chemical, glyphosate release rate is tuned by varying the shell thickness. © 2012 The Nonferrous Metals Society of China. Source

Liu C.,Beihua University | Liu C.,Jiangsu University | Yin H.-B.,Jiangsu University | Shi L.-P.,Beihua University | And 6 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

The adsorbability of hollow SiO2 nanospheres of high adsorption capacity and large specific surface area for Pb2+, Cu2+, and Cr3+ ions was investigated. The absorbtion equilibrium data were fitted by Langmuir linear equation. The results show that hollow SiO2 nanospheres have high adsorption capacity for heavy metal ions, the adsorption capacities for Pb2+, Cu2+ and Cr3+ ions are 1.256, 0.681, and 0.563 mmol/g, respectively. As the fitting data shown, there is a strong correlation between the adsorption capacity and ion characteristics (covalent index and charge density). The adsorption capacity increases with the increase in covalent index or decrease in charge density. The adsorption constant is related to electric field intensity of ion (effective nuclear charge), and the adsorption constant increases with the increase in effective nuclear charge of ion. This adsorption process should belong to chemisorption. The regenerated adsorbent can be reused many times. Source

Chen J.,Jiangsu University | Gao J.,Jiangsu University | Yin H.,Jiangsu University | Liu F.,Chinese PLA 359 Hospital | And 8 more authors.
Materials Science and Engineering C

Different-sized α-calcium sulphate hemihydrate (α-CSH) rods were hydrothermally prepared by converting calcium sulphate dihydrate at 110-140 C in the presence of MgCl2, sodium citrate (CANa), and sodium dodecyl benzene sulfonate (SDBS) as the modifiers. The α-CSH rods with the average diameters and the average lengths in the ranges of 2.6-5.2 and 17.5-33.1 μm, respectively, were tunably prepared. The presence of the modifiers favoured the formation of small-sized α-CSH rods. The effect of the modifiers on decreasing the diameters of α-CSH rods was in an order of SDBS > CANa > MgCl2. The dissolution rates of the different-sized α-CSH rods prepared at 140 C in simulated body fluid were in an order of α-CSH (CANa) > α-CSH (MgCl2) > α-CSH (reference) > α-CSH (SDBS). The naked and small-sized α-CSH rods had high dissolution rates. The adsorption of SDBS on the surfaces of α-CSH rods decreased their dissolution rates. © 2013 Elsevier B.V. Source

Ji Y.,Jiangsu University | Wang A.,Jiangsu University | Wu G.,Chinese PLA 359 Hospital | Yin H.,Jiangsu University | And 4 more authors.
Materials Science and Engineering C

Porous biocompatible hydroxyapatite (HAP) nanorods of various sizes were synthesized by the combination of chemical precipitation and hydrothermal method without the use of organic modifiers. The HAP nanorod samples were characterized by powder X-ray diffraction, transmission electron microscopy, and N2 adsorption/desorption techniques. HAP nanorods with average diameters and average lengths ranging from 8.5 to 26.6 nm and from 23.1 to 49.7 nm, respectively, could be controllably synthesized via these methods. Low autoclaving temperature and high pH value favored the formation of relatively small HAP nanorods. The TEM images showed that the nanorods possessed porous structures with average pore diameters ranging from 1.6 to 2.7 nm. These HAP nanoparticles effectively prolonged the release time of 5-fluorouracil up to 24 h. The assynthesized HAP nanorods displayed no cytotoxicity to bone marrow stem cells at low HAP concentration, indicating that these nanorod materials could serve as potential carriers for novel drug release systems. © 2015 Elsevier B.V. All rights reserved. Source

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