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日月相知银虫 (初入文坛)
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[求助]
关于纳米金属形貌控制的外文文献，初来咋到，跪求翻译
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In a typical synthesis, aqueous solutions of K2PtCl4 (Alfa Aesar, 99.9%) and C14TABr (Aldrich, 99%) were mixed in a 20-mL vial at room temperature. The mixture was heated at 50 8C for about 5 min until the solution became clear. The vial was capped with a rubber septum immediately after adding ice-cold NaBH4 (Strem Chemicals, 98%) and the H2 gas pressure inside the vial was released through a needle in the septum for 10 min. The needle was then removed and the solution was kept at 50 8C for 6 h. When l-ascorbic acid (Aldrich, 99 + %) was used as the reducing agent the solution was kept at 70 8C. The total volume of the solution was maintained at 10 mL. When necessary, H2 gas was passed through the solution slowly for 5 min and then pressurized for 1 min without an exit needle. The product was centrifuged at 3000 rpm for 30 min. The supernatant solution was separated and centrifuged again at 12000 rpm for 10 min. The precipitate was collected and re-dispersed in 5 mL of deionized water by sonication. UV/Vis absorption spectra were recorded with an Agilent 8453 UV/Vis system. TEM and HRTEM images were obtained with a Jeol 200CX microscope and a Philips CM200 microscope, respec-tively, operating at 200 kV, at the National Center for Electron Microscopy at the Lawrence Berkeley National Laboratory. The surface area was measured with a Quantachrome Autosorb-1 analyzer at 77 K using nitrogen as the adsorption gas. Before the measurement, degassing was conducted at 150 8C for 48 h to remove possible moisture. The pH value was measured with a Mettler Toledo MP220 pH meter. [ Last edited by 日月相知 on 2012-4-11 at 21:28 ] |
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一个典型的合成过程：室温下将四氯合铂酸钾（Alfa Aesar公司产品，纯度99.9%）和十四烷基三甲基溴化铵（Aldrich公司产品，纯度99%）的水溶液混合在20毫升的小瓶中。然后，将混合物置于50℃加热约5分钟，直到溶液变得澄清。加入冰冷的硼氢化钠（Strem Chemicals产品，纯度98%）后立即用橡胶隔封盖瓶口，在瓶口橡胶隔中置入细针释放小瓶里面的氢气压力10分钟。去掉瓶口细针，并将溶液置于50℃保持6小时。如果以L-抗坏血酸（Aldrich公司产品，纯度大于99%）作为还原剂，则将溶液保存在70℃；并使溶液总体积保持在10毫升。必要时，利用细针使氢气缓慢通过溶液5分钟，然后去掉细针，加压1分钟。3000转/分钟离心30分钟，收集上清液；12000转/分钟离心上清液10分钟。收集沉淀，超声作用下去离子水溶解，重新分装在5 ml瓶子中。 Agilent 8453紫外/可见光系统记录样本紫外/可见吸收光谱。在劳伦斯伯克利国家实验室的电子显微镜中心，200千伏电压条件下，分别用JEOL200CX和飞利浦CM200电子显微镜捕获其透射电镜图像和高分辨率透射电镜图像。以氮气作为吸附气体，在77 K温度下用Quantachrome Autosorb-1分析仪测定样本比表面积。测量前，150℃条件下进行脱气处理48小时，以消除可能存在的水分；用梅特勒-托利多MP220 pH计测定pH值。 |
2楼2012-04-12 10:21:59
