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linxiaoxia金蟲(chóng) (初入文壇)
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[求助]
納米粒子如何提純? 已有1人參與
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| 參照文獻(xiàn)合成了一種Ru的納米粒子,文獻(xiàn)報(bào)道是說(shuō)粒徑大小在5nm左右,可是我測(cè)AFM發(fā)現(xiàn)里面有微米級(jí)的粒子,也有幾百納米的粒子,就是好幾種粒徑大小的粒子都有,是不是產(chǎn)物不純?要怎么提純得到較小粒徑的粒子呢?求解答。。。 |
金蟲(chóng) (小有名氣)
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金蟲(chóng) (初入文壇)
金蟲(chóng) (小有名氣)
平靜

金蟲(chóng) (初入文壇)
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你好,文獻(xiàn)中的合成步驟如下:Alkyne-Stabilized Ruthenium Nanoparticles. In a typical reaction, to a two-neck round-bottom flask under dry nitrogen protection was added 1-octyne (0.14 mL, 0.94 mmol) and THF (5 mL,anhydrous). The solution was cooled to -78°C (acetone/dry ice bath) and stirred prior to the dropwise addition of 2.24 M n-BuLi in hexanes (0.42 mL, 0.96 mmol). The reaction was allowed to stir fo r1hto prepare 1-octynyllithium. In a separate flask, ruthenium chloride predried under a vacuum oven and THF (30mL,anhydrous) was stirred and cooled to -78°C.The ruthenium salt solution was added to the cooled 1-octy-nyllithium solution via cannula, and the resulting mixture was allowed to warm to room temperature over a period of 1 h. A 1.0 M solution of lithium triethylborohydride in hexanes (5.0mL, 5.0 mmol) was added dropwise to the reaction mixture,and the resulting solution exhibited an immediate color change from dark red to dark brown, signifying the formation of Ru nanoparticles. The resulting solution was allowed to stir at room temperature over 3 h. The reaction was cooled with an ice-water bath and quenched with Nanopure water. Solvents were then removed under reduced pressure with a rotary evaporator. The resulting sample was washed several times with copious amounts of ethanol to remove any excess of ligands and other impurities, affording purified nanoparticles (denoted as Ru-OC). The particles were found to be readily soluble in typical apolar solvents such as toluene, THF, chloroform, and dichloromethane, and not soluble in polar solvents such as alcohols, acetone, and acetonitrile. |
金蟲(chóng) (小有名氣)
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金蟲(chóng) (初入文壇)
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