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lcc830306银虫 (小有名气)
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Aqueous Nanoceria. Nanoceria was synthesized in water by simple oxidation of cerium ions using a suitable oxidizer. A 0.5-0.7 g amount of cerium(III) nitrate hexahydrate (Sigma Aldrich) was dissolved in 50 mL of deionized water (18.2 M¿  . The solution containing Ce(III) ion was then oxidized using 0.2 mL of hydrogen peroxide (30% w/w Sigma Aldrich) for acidic oxidation and 0.05 mL of ammonia for base-mediated oxidation (30% w/w Sigma Aldrich).Glucose- and Dextran-Based Nanoceria. The aqueous procedure was slightly modified to incorporate the polymers in solution. Preparation of nanoceria in these polyhydroxyl groups was done in two separate concentrations. A 0.5 and 5 mM solution of dextran (Sigma Aldrich) (MW 1000) and 2 and 20 mM solution of D-glucose (Sigma Aldrich) were prepared. Cerium(III) nitrate hexahydrate was then dissolved in these solutions and stirred to allow complete complexation to take place. The solution was then oxidized using hydrogen peroxide (acidic) and ammonia (basic). A scheme of various experimental conditions is shown . |
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lz3333
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lcc830306(金币+30, 翻译EPI+1): 2010-05-03 12:14
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水相纳米二氧化铈 利用合适的氧化剂在水相中对三价铈离子进行氧化生成纳米二氧化铈，0.5-0.7g六水合硝酸铈(III）(sigma Aldrich)溶于50ml去离子水中，含有三价铈离子的溶液加入0.2ml过氧化氢（30%浓度）酸化氧化以及0.05ml氨水用于碱性氧化。 葡萄糖以及葡聚糖配基的纳米级二氧化铈 配置水相过程改成在溶液中同时加入聚合物。在这些多羟基集团中制备二氧化铈是在不同浓度中进行。分别配置0.5mM和5mM的葡聚糖（分子量1000）以及2和20mM的D-葡萄糖溶液。六水合硝酸铈(III）溶于这些溶液中并搅拌以使络合反应发生。然后溶液用过氧化氢和氨水进行氧化。不同实验条件的设计如下。 |
2楼2010-04-30 22:41:16