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melodybusy木虫 (著名写手)
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[求助]
氧化石墨烯水溶液算是胶体体系么?给个高亮吧!大家交流下
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如题,氧化石墨烯用hurmurs方法制备后,超声在水溶液里。分散性还挺好的。放置那里几天后就分层了,明显的上面是水系,下面就是氧化石墨烯? 所以想问下这个氧化石墨烯水溶液是胶体体系吗?? 另外,如果这个是胶体体系,那么氧化石墨烯胶体带各种电荷??在电场作用下怎么运动? |
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是偏棕色的,越稀的话应该会偏红一点吧,0.1mg/ml还沉的话应该就是氧化剥离没做好 The graphene oxide used in this work was prepared from natural graphite (Alfa Aesar) by using a modified Hummers method. 5 g of graphite and 2.5 g of sodium nitrate (NaNO3) were mixed with 160 mL of concentrated sulfuric acid (H2SO4, 95%, Sigma–Aldrich) in a 500 mL flask. After the mixture was stirred for 30 min in an ice bath, 18 g of potassium permanganate (KMnO4) was added under vigorous stirring. The rate of addition was carefully controlled to keep the reaction temperature lower than 20 °C. After th e mixture was continuously stirred at room temperature(我这里用的是40度水浴,温度不能过高,这里面全是七氧化二锰,50度剧烈分解,很危险的。后面里面会变得非常粘稠,和泥浆差不多,所以磁力搅拌一定要给力) overnight, 150 mL of deionized (DI) water was slowly added under vigorous agitation. After the diluted suspension was stirred for one day, 50 mL of 30 wt.% H2O2 was added to the mixture. Finally, the mixture wa s washed by rinsing and centrifugation with 5 wt.% HCl and then DI water for several times. (水洗会比较难离心,酸洗基本3000转就可以,水洗到后面我是20000转5分钟都不能离心的彻底) Chemical exfoliation of thus-obtained graphite oxide was carried out in an ultrasonic bath. After ultrasonication, a GO colloid was obtained. 后者用improve hummer method,效果也不错 |
11楼2012-12-20 21:38:43
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