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魯班大師新蟲 (初入文壇)
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[求助]
20nm的球形納米銀的制備,用來接巰基DNA 已有1人參與
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本人想制備20nm納米銀,后續(xù)用于接巰基DNA做熒光增強,用2mM硝酸銀逐滴加入到兩倍體積的3mM的硼氫化鈉中,冰浴和磁力攪拌,但是硝酸銀滴加不完就會變成黑色聚沉,因為什么原因呢?或者有時候不變黑,滴加完后磁珠上也會有黑色沉淀,制備的銀膠會有一些黑色的沉淀 和滴加速度有沒有關系,應該用什么速度,都是用注射器手動滴加,或者硼氫化鈉和硝酸銀的濃度和比例應該怎么合適呢?跪求大神幫助 發(fā)自小木蟲Android客戶端 |
新蟲 (正式寫手)

專家顧問 (著名寫手)
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專家經驗: +208 |
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一般都是用檸檬酸鈉穩(wěn)定的金或銀納米顆粒接巰基DNA,制備單分散性良好的納米銀,可以用我們小組探索的方法,重復性非常好: 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 seedamount, without extra additives, pH adjustment, and laser treatment. The crucial factors that affect the uniformity of the resulting AgNPs are discussed |

新蟲 (初入文壇)
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