| 查看: 1182 | 回复: 6 | ||
| 当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖 | ||
[求助]
合成方法工艺求教 已有2人参与
|
||
|
一个合成GQDs的方法里, Preparation: GO sheets were prepared from natural graphite powder by a modified Hummers method [28,29]. GSs were obtained by thermal deoxidization of GO sheets in a tube furnace at 200–300 8C for 2 h with a heating rate of 5 8C min1 in a nitrogen atmosphere. GSs (0.05 g) were oxidized in concentrated H2SO4 (10 mL) and HNO3 (30 mL) for 15–20 h under mild ultrasonication (500 W, 40 kHz). The mixture was then diluted with deionized (DI) water (250 mL) and filtered through a 0.22-mm microporous membrane to remove the acids. Purified oxidized GSs (0.2 g) were re-dispersed in DI water (40 mL) and the pH was tuned to 8 with NaOH. The suspension was transferred to a poly(tetrafluoroethylene) (Teflon)-lined autoclave (50 mL) and heated at 200 8C for 10 h. After cooling to room temperature, the resulting black suspension was filtered through a 0.22-mm microporous membrane and a brown filter solution (yield ca. 22%) was separated. The colloidal solution still contained some large graphene nanoparticles (50–200 nm) that emitted weak blue fluorescence. So, the colloidal solution was further dialyzed in a dialysis bag (retained molecular weight: 3500 Da) overnight and GQDs that were strongly fluorescent through the bag were obtained with a yield of ca. 5%. So, the colloidal solution was further dialyzed in a dialysis bag (retained molecular weight: 3500 Da) overnight 。这儿说的透析用到的是什么东西呀,有其它的可以替代的操作吗? |
» 猜你喜欢
合肥工业大学854仪器技术综合专业课考研
已经有0人回复
HXDI做水性聚氨酯乳液,是不是特别容易出渣
已经有3人回复
高分子科学论文润色/翻译怎么收费?
已经有213人回复
27年电化学博士毕业,想找海外QS前50的高校读博后求推荐
已经有3人回复
27年电池/材料类博士申请
已经有2人回复
邀您投稿 Polymers 特刊
已经有5人回复
2027年博士申请或转博科研助理 求推荐
已经有1人回复
实验室富余
已经有27人回复
高密度聚乙烯挤出管材
已经有5人回复
氯化钠与有机磺酸分离
已经有0人回复
酚醛树脂微球制备
已经有0人回复
» 本主题相关价值贴推荐,对您同样有帮助:
求助:利鲁唑(即2-氨基-6-三氟甲氧基苯并噻唑)的车间合成工艺
已经有6人回复
消除催化零回复,感谢虫友来交流(四)
已经有27人回复
如何知道专利是否侵权
已经有11人回复
关于水性聚氨酯涂料的合成问题。
已经有40人回复
高手帮忙这个咪唑化合物的合成工艺,2-bromo-1H-imidazole-5-carboxylic acid
已经有1人回复
2-甲氧羰基环戊酮合成方法
已经有0人回复
【资源】催化剂制备中浸渍(等体积浸渍)不断改进
已经有151人回复
【求助】用丙烯醛或丙烯酸乙酯合成丙烯酸的方法
已经有2人回复
【其他】求教乳液聚合实验
已经有9人回复
6楼2016-07-21 23:55:02
匿名
用户注销 (著名写手)
- TEPI: 8
- 应助: 302 (大学生)
- 贵宾: 0.289
- 金币: 9260.7
- 散金: 10732
- 红花: 198
- 帖子: 2446
- 在线: 677.7小时
- 虫号: 0
- 注册: 2007-05-27
- 性别: GG
- 专业: 化学反应工程
- 管辖: 工艺技术
2楼2016-07-19 09:24:58
匿名
用户注销 (著名写手)
- TEPI: 8
- 应助: 302 (大学生)
- 贵宾: 0.289
- 金币: 9260.7
- 散金: 10732
- 红花: 198
- 帖子: 2446
- 在线: 677.7小时
- 虫号: 0
- 注册: 2007-05-27
- 性别: GG
- 专业: 化学反应工程
- 管辖: 工艺技术
3楼2016-07-19 09:25:40
4楼2016-07-19 18:10:34










回复此楼
