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21楼2011-12-05 14:19:36
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22楼2011-12-05 17:08:13
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二小小木虫

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gs198653(金币+2): 谢谢指教 2011-12-05 19:50:25
xjajx(金币+2): 2012-02-23 18:36:43
先用jade分析一哈 看看5-6°的强峰是不杂质造成的 至于具体的合成步骤 个人感觉有一些差别不会影响太大
23楼2011-12-05 17:53:02
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anjin0716

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21楼: Originally posted by gs198653 at 2011-12-05 14:19:36:
我知道速度要慢
但是加水要连续吧?
是用滴管一滴一滴的加入还是缓慢导入呢?
你们具体是怎么操作的?

都可以啊呵呵两种方法差不多啊,不要连续加入啊呵呵
苦不是一件坏事,它会让你未来的甜变得更加甜!!!
24楼2011-12-05 19:31:49
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25楼2011-12-06 15:22:08
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wangyanqin7602

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gs198653(金币+5): 非常感谢 2011-12-15 18:52:00
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25楼: Originally posted by gs198653 at 2011-12-06 15:22:08:
现在主要问题不在22峰 22出的峰可以有办法去掉
而是10.8没有氧化石墨的峰 而出现在5-6了很强的峰

给你一个我常用的方法:
GO was obtained following a modified Hummers-Offeman method . Briefly, graphite (2.0 g; Bay carbon, sp-1), sodium nitrate (1.0 g), concentrated sulfuric acid (98%, 50 ml), and potassium permanganate (6.0 g) were consistently mixed in an ice bath for 2 hours, with the mixture gradually becoming pasty and black-greenish. Next, the mixture was placed in a 35°C water bath and kept at that temperature for 30 minutes, followed by the slow addition of distilled water (100 ml) to keep the solution from effervescing; the resulting solution was placed at well below 100°C for 3 hours. With progression of the reaction, the color turned a little yellowish. After further treatment with H2O2 (5%, 100 ml), the filtered cake was washed with distilled water several times until its supernatant was without SO42-, as tested using barium chloride (0.1 mM). Then the cake was dispersed in water for further ultra-sonication for 1 hour. Of note, for facilitating the following experiments, we selected solutions with GO sheets centrifuged at speeds ranging from 1000 to 10,000 rpm, with a concentration and pH value of approximately 0.48% and 3.1, respectively.
26楼2011-12-07 10:13:26
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27楼2011-12-15 18:53:44
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wangyanqin7602

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xjajx(金币+2): 2012-02-23 18:37:08
向浓酸中加水会喷溅的,因此,需要剧烈搅拌慢慢加水。至于温度控制,我想没有什么必要
28楼2011-12-16 14:10:08
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zjujxl

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细心点就行~ 每步要严谨
其为人也,发愤忘食,乐以忘忧,不知老之将至!
29楼2011-12-28 16:36:40
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