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小木虫论坛-学术科研互动平台 » 材料区 » 微米和纳米 » 学术交流 » 油相碳點純化問題
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physics0601

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[求助] 油相碳點純化問題 已有1人参与

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?@??????????????????c:  Size-Controlled Soft-Template Synthesis of Carbon Nanodots toward Versatile Photoactive Materials
Synthesis of Organic-Soluble Oleylamine-Capped CNDs : All chemicals were purchased from Sigma-Aldrich and used as received unless otherwise specifi ed. We add citric acid (1 g) and 0.5 M nitric acid (1 mL) to water (1 mL). Several controlled experi-ments were performed by varying the precursor (0.5 g of glucose, 1.0 g of fructose, 0.2 g of glycolic acid, and 0.2 g of glycine) and the mass of citric acid (0.2, 0.4, 0.6, and 0.8 g). The mixture was vigorously stirred to dissolve citric acid and then injected with  x   mL of oleylamine and  y  mL of octadecene, where  x : y   = 4:6, 3:7, 2:8, 1:9, and 0.5:9.5. The solution was vigorously stirred for 10 min to form a milky emulsion. The emulsion was heated to 250 ??C under argon for 2 h. Different reaction temperatures (160 and 200 ??C) were also tried. The color of the solution became transparent with raising temperature and fi nally turned to dark brown.  The resultant solution was precipitated with methanol, isolated by centrifugation (3000 rpm for 10 min), and re-dispersed in hexane. This process was repeated three times to remove residuals. The final colloidal CNDs (??1 g) were dried in a vacuum oven (80 ??C) overnight and then stored in a desiccator for further use.

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1楼 2016-01-11 22:35:09
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tongtxuan

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感谢参与，应助指数 +1
physics0601: 金币+10, ★★★★★最佳答案, 受益良多，謝謝你 2016-01-12 15:02:02
甲醇的作用是沉淀剂，加甲醇后离心，保留沉淀物。甲醇层有发光是因为肯定有少量的碳点存留在甲醇层。加正己烷是为了再次分散碳点。然后向己烷溶液中加甲醇再次沉淀碳点
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2楼2016-01-12 10:45:04
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physics0601

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???????:
2?: Originally posted by tongtxuan at 2016-01-12 10:45:04
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3楼2016-01-12 11:21:28
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tongtxuan

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???????:
3?: Originally posted by physics0601 at 2016-01-12 11:21:28
?x?x?????С??????Щ???
???^250????????????????S?(??w)????s?????????w????????????Щ???S???????w??????????????????????????????????????????????

????????????_????r????? ...

????????????е????????????????????????????????????60??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Ч???
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4楼2016-01-12 11:39:30
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physics0601

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???????:
4?: Originally posted by tongtxuan at 2016-01-12 11:39:30
????????????е????????????????????????????????????60????????????????????????????????????????????????????????????????????????????????????????????????????? ...

????????^???????paper???f????????  ???????????飬??c???????????????s?|???????????飬??r??????????????m??????????  
????????飬?????????????????????_??paper?f??????Σ?????????????+??????????????飬 ?????????????+??????????????????飬 ??????????????+??????????????????????   ????????????????κ?????????

?@??????????????? ?x?x??
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5楼2016-01-12 12:11:50
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tongtxuan

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5楼: Originally posted by physics0601 at 2016-01-12 12:11:50
那一般純化過程，就如paper所說的洗三次?  當分散於正己烷，碳點沉?瘴锖筒糠钟托噪s質也會溶於正己烷，此時再加入甲醇沉?眨策m用溫熱的甲醇嗎?  
有一件事情，我想請大哥您看一下是否正確，paper說的洗三次，第 ...

洗几次需要经验，不一定像文章里说的那样，清洗步骤除了第一个循环是反应液，其他就是甲醇向碳点的己烷溶液中加，量需要实验经验，建议碳点浓度高点。

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6楼2016-01-12 14:49:26
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自强不息3118

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请问楼主可有这篇文章的出处？谢谢了~
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7楼2016-01-13 09:10:38
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physics0601

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引用回帖:
7楼: Originally posted by 自强不息3118 at 2016-01-13 09:10:38
请问楼主可有这篇文章的出处？谢谢了~

你好， 這篇是Small的paper， 篇名是 Size-Controlled Soft-Template Synthesis of Carbon Nanodots toward Versatile Photoactive Materials
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自强不息3118
8楼2016-01-13 12:11:10
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自强不息3118

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送红花一朵
引用回帖:
8楼: Originally posted by physics0601 at 2016-01-13 12:11:10
你好， 這篇是Small的paper， 篇名是 Size-Controlled Soft-Template Synthesis of Carbon Nanodots toward Versatile Photoactive Materials...

谢谢楼主！
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9楼2016-01-14 17:48:36
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自强不息3118

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引用回帖:
8楼: Originally posted by physics0601 at 2016-01-13 12:11:10
你好， 這篇是Small的paper， 篇名是 Size-Controlled Soft-Template Synthesis of Carbon Nanodots toward Versatile Photoactive Materials...

谢谢楼主！
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10楼2016-01-14 17:49:00
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