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续明慧

新虫 (正式写手)

11楼2015-12-30 20:02:12
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chuhairong

木虫 (正式写手)

引用回帖:
10楼: Originally posted by zhaoyueer at 2015-12-30 14:04:54
洗至中性之后该怎么办
...

超声,脱落成氧化石墨烯

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12楼2015-12-30 23:00:57
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zhaoyueer

新虫 (初入文坛)

引用回帖:
12楼: Originally posted by chuhairong at 2015-12-30 23:00:57
超声,脱落成氧化石墨烯
...

谢谢

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13楼2015-12-30 23:03:35
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匿名

用户注销 (初入文坛)

感谢参与,应助指数 +1
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14楼2015-12-31 08:28:43
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zhaoyueer

新虫 (初入文坛)

引用回帖:
14楼: Originally posted by ice1209 at 2015-12-31 08:28:43
我最近也在做,用Hummers方法。最后加入双氧水之后,搅拌五分钟,捯到烧杯中静置一晚,然后把上层浮渣去除,以后进行离心洗涤。

上层的不要了?只需要下层的沉淀部分?
15楼2015-12-31 11:29:24
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wangge1113

新虫 (初入文坛)

引用回帖:
7楼: Originally posted by chemistry婷 at 2015-12-30 13:12:07
我是先静置,倒掉上清液,然后离心,再倒掉上清液,洗涤,再离心,再倒掉上清液,直到中性为止~\(≧▽≦)/~
...

请问离心干燥后的产品什么形态算是成功呢?
16楼2015-12-31 15:34:49
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匿名

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17楼2016-01-01 10:16:33
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人生似梦

铁虫 (小有名气)

之后过滤,用稀盐酸洗涤,去除里面的金属离子。然后在透析几天,就ok了!
没有最好,只有更好。
18楼2016-01-01 19:12:14
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等你来我就

新虫 (小有名气)

【答案】应助回帖

Preparation of Graphene Oxide and Its Exfoliated Suspension. A modified Hummers method was utilized to synthesize oxidized graphite powder (25). Typically, 2.5 g of natural graphite, 2.5 g of NaNO3, and 7.5 g of KMnO4 were slowly added to 50 mL of concentrated H2SO4 under vigorous stirring below 5 °C. Then the mixture was stirred continuously for 1 h at 35 °C to oxidize the graphite. After that, 100 mL water was added into the mixture, and the temperature was increased to higher than 90 °C, and the suspension was maintained at 95-100 °C for 15 min. Then, the mixture was poured into 300 mL of deionized water, after that 20 mL of H2O2 was added into the suspension. After cooling to room temperature, the solid products were filtered, subsequently washed with 5% HCl aqueous solution and water, and finally dried to obtain graphite oxide. The obtained graphite oxide was dispersed in DMF (1.0 mg·mL-1) by ultrasonication treatment by using an ultrasonication bath cleaner for 3 h. The resulting exfoliated GO suspension was centrifuged at 2000 rpm for 5 min to remove the unexfoliated graphite oxide particles.


希望能帮到你
19楼2016-01-07 11:30:38
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sunny1925

木虫 (正式写手)

引用回帖:
3楼: Originally posted by chemistry婷 at 2015-12-29 23:10:51
离心洗涤去除过量的酸及副产物。

一般离心洗几次,我用4000转洗了三次,中性了,但是分散到水里后的分散性不好,是什么原因

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20楼2016-01-14 10:09:16
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