Synthesis of spindly BaWO4 crystals induced by poly4-vinylpyridine
文献类型：期刊论文
| 作者 | Wang Lei1; Mao Lixin1; Liu Gang2; Zhou Jianjun2; Li Jinhuan2 |
| 刊名 | ACTA POLYMERICA SINICA
 |
| 出版日期 | 2007-12-01 |
| 期号 | 12页码:1187-1191 |
| 关键词 | Bawo4 Scheelite Structure Crystal Growth Poly4-vinylpyridine Modifier |
| ISSN号 | 1000-3304 |
| 英文摘要 | Spindly BaWO4 crystals were synthesized by using a high molecular weight N-containing heterocyclic homopolymer, poly4-vinylpyridine (P4VP), as a template. The well-defined shape of BaWO4 crystals was characterized with scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The size and shape of the spindly BaWO4 crystals can be controlled through adjusting the pH value and the polymer concentration of the solution. The favorite spindly BaWO4 crystals can be obtained at an appropriate polymer concentration. Spindly BaWO4 crystals with various sizes were observed at low concentration of P4VP (< 0.1 g/L). When the concentration of P4VP was larger than 1 g/L, the dimensions of the spindles were more uniform and smaller. Very uniform BaWO4 crystals with length of 2.5 mu m were obtained at P4VP concentration of 10 g/L. The reactant concentration, i.e the concentration of Ba2+ and WO42-, played an important role in the morphological control of the BaWO4 crystals. At lower Ba2+ concentrations (0.02 mmol/L) only clusters without the spindly appearance were found. Spindly BaWO4 crystals were obtained as the concentration of Ba2+ was increased to 2 mmol/L. Further increasing Ba2+ concentration to 20 mmol/L seriously distorted spindly BaWO4 crystals formed. The pH value also affects the formation of BaWO4 crystals. The increase of pH value promoted the formation of more uniform spindly crystals. Distorted BaWO4 nanoparticles were obtained at lower pH values (< 4). Spindly crystals were obtained as the pH value increased to 6.5. More uniform small crystals were obtained when the pH value was increased to 8. The formation mechanism of the spindly BaWO4 crystals was suggested according to the experimental results. We suggested that at appropriate conditions (such as pH range, concentration of Ba2+ and P4VP) the Ba2+ should react with most suspended pyridyl to form BaWO4 nanoparticles of various sizes at first, and then the residual pyridyl suspended on the main chain should react with the Ba2+ in solution further to induce the orderly growth and aggregation of nanosized crystals, and spindly BaWO4 crystals form at last. |
| 语种 | 英语 |
| WOS记录号 | WOS:000252101700014 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/61301]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wang Lei |
| 作者单位 | 1.Beijing Univ Chem Technol, Coll Mat Sci & Engn, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang Lei,Mao Lixin,Liu Gang,et al. Synthesis of spindly BaWO4 crystals induced by poly4-vinylpyridine[J]. ACTA POLYMERICA SINICA,2007(12):1187-1191. |
| APA | Wang Lei,Mao Lixin,Liu Gang,Zhou Jianjun,&Li Jinhuan.(2007).Synthesis of spindly BaWO4 crystals induced by poly4-vinylpyridine.ACTA POLYMERICA SINICA(12),1187-1191. |
| MLA | Wang Lei,et al."Synthesis of spindly BaWO4 crystals induced by poly4-vinylpyridine".ACTA POLYMERICA SINICA .12(2007):1187-1191. |
入库方式： OAI收割
来源：化学研究所
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