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[求助]
硝酸銀和檸檬酸鈉合成納米銀 已有2人參與
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| 用檸檬酸鈉和硝酸銀合成球形納米銀,結(jié)果出現(xiàn)很多棒狀的納米銀。這是什么原因?是不是攪拌時間不夠。我一般合成納米銀都是攪拌和加熱同時進行。當合成溶液變色時,停止攪拌和加熱,冷凝1小時。 |

新蟲 (正式寫手)

木蟲 (著名寫手)


專家顧問 (著名寫手)
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專家經(jīng)驗: +208 |
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具體看看我們小組的這篇工作吧。Wan Y, Guo Z, Jiang X, Fang K, Lu X, Zhang Y, Gu N: Quasi-spherical silver nanoparticles: Aqueous synthesis and size control by the seed-mediated Lee-Meisel method. J Colloid Interface Sci 2013, 394:263-268. |



專家顧問 (著名寫手)
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專家經(jīng)驗: +208 |
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可以看看我們小組的工作,你的問題在文章中有明確解釋: Wan Y, Guo Z, Jiang X, Fang K, Lu X, Zhang Y, Gu N: Quasi-spherical silver nanoparticles: Aqueous synthesis and size control by the seed-mediated Lee-Meisel method. J Colloid Interface Sci 2013, 394:263-268. Abstract:Silver nanoparticles (AgNPs) are attracting tremendous attention in biomedicine, and their related performances are shape and size-dependent. For biomedical applications, water-soluble AgNPs are necessary. However, aqueous syntheses of AgNPs with controlled shape and size are relatively difficult as the balance between nucleation and growth is hard to regulate. This paper describes a robust method for controllable synthesis of quasi-spherical AgNPs based on the combination of the seed-mediated growth and the Lee–Meisel method by thermal reduction of AgNO3with citrate. In the presented method, citrate-stabilized AgNPs with tunable sizes up to 80 nm were achieved through one-step or stepwise growth process using qualified spherical 4 nm AgNPs as starter seeds. Specially, the two main difficulties (formation of nanorods and secondary nucleation during the growth stage) in the previous studies have been effectively overcome by tailoring the experimental parameters such as the reaction temperature and the seed amount, without extra additives, pH adjustment, and laser treatment. The crucial factors that affect the uniformity of the resulting AgNPs are discussed. |

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