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zzlcsu

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8Â¥: Originally posted by melodybusy at 2012-12-20 20:33:21
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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¨CAldrich) 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 ¡ãC. After th e mixture was continuously stirred at room temperature£¨ÎÒÕâÀïÓõÄÊÇ40¶Èˮԡ£¬Î¶Ȳ»Äܹý¸ß£¬ÕâÀïÃæÈ«ÊÇÆßÑõ»¯¶þÃÌ£¬50¶È¾çÁҷֽ⣬ºÜΣÏյġ£ºóÃæÀïÃæ»á±äµÃ·Ç³£Õ³³í£¬ºÍÄཬ²î²»¶à£¬ËùÒÔ´ÅÁ¦½Á°èÒ»¶¨Òª¸øÁ¦£© 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. £¨Ë®Ï´»á±È½ÏÄÑÀëÐÄ£¬ËáÏ´»ù±¾3000ת¾Í¿ÉÒÔ£¬Ë®Ï´µ½ºóÃæÎÒÊÇ20000ת5·ÖÖÓ¶¼²»ÄÜÀëÐĵij¹µ×£© Chemical exfoliation of thus-obtained graphite oxide was carried out in an ultrasonic bath. After ultrasonication, a GO colloid was obtained.
ºóÕßÓÃimprove hummer method£¬Ð§¹ûÒ²²»´í
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melodybusy

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11Â¥: Originally posted by zzlcsu at 2012-12-20 21:38:43
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The graphene oxide used in this work was prepared from natural graphite  (Alfa Aesar) by using a modified Hummers method ...

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melodybusy

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11Â¥: Originally posted by zzlcsu at 2012-12-20 21:38:43
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The graphene oxide used in this work was prepared from natural graphite  (Alfa Aesar) by using a modified Hummers method ...

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