24小时热门版块排行榜    

查看: 1063  |  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

麦兜520

新虫 (初入文坛)

[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?
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

麦兜520

新虫 (初入文坛)

明亮的眼眸: 请及时给2楼评分,谢谢。 2016-07-20 22:28:54
引用回帖:
3楼: Originally posted by 古德里安 at 2016-07-19 09:25:40
http://8944.net/img/3/01f378ef791e968555.jpg

见示意图。...

嗯,后来搜了些资料了解了一些,准备联系买半透膜和一些耗材做实验。

发自小木虫Android客户端
4楼2016-07-19 18:10:34
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 7 个回答

匿名

用户注销 (著名写手)

★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
麦兜520: 金币+10, ★★★很有帮助, 是我在找的东西 2016-07-21 23:54:09
本帖仅楼主可见
2楼2016-07-19 09:24:58
已阅   申请TEPI   回复此楼   编辑   查看我的主页

匿名

用户注销 (著名写手)

本帖仅楼主可见
3楼2016-07-19 09:25:40
已阅   申请TEPI   回复此楼   编辑   查看我的主页

hg30717580

木虫 (职业作家)

总经理

【答案】应助回帖


感谢参与,应助指数 +1
明亮的眼眸: 金币+1, 谢谢回帖。 2016-07-22 12:50:09
可以替代 现在的膜技术就可以。 超滤 纳滤 分渗透都可以的
突破自我,喜迎曙光
5楼2016-07-20 22:58:33
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 307求调剂 +9 冷笙123 2026-03-17 9/450 2026-03-19 22:44 by 学员8dgXkO
[考研] 321求调剂 +8 何润采123 2026-03-18 10/500 2026-03-19 16:46 by 何润采123
[考研] 317求调剂 +3 申子申申 2026-03-19 6/300 2026-03-19 14:16 by 申子申申
[考研] 求调剂,一志愿:南京航空航天大学大学 ,080500材料科学与工程学硕,总分289分 +3 @taotao 2026-03-19 3/150 2026-03-19 14:07 by peike
[考研] 287求调剂 +3 晨昏线与星海 2026-03-19 4/200 2026-03-19 12:32 by peike
[考研] 346求调剂[0856] +3 WayneLim327 2026-03-16 6/300 2026-03-19 11:21 by WayneLim327
[考研] 一志愿985,本科211,0817化学工程与技术319求调剂 +10 Liwangman 2026-03-15 10/500 2026-03-19 10:25 by 无际的草原
[教师之家] 焦虑 +9 水冰月月野兔 2026-03-13 13/650 2026-03-19 09:50 by otani
[考研] 330求调剂 +3 小材化本科 2026-03-18 3/150 2026-03-18 21:55 by 无懈可击111
[考研] 一志愿武理材料305分求调剂 +5 想上岸的鲤鱼 2026-03-18 6/300 2026-03-18 17:53 by 无际的草原
[考研] 085600材料与化工 +5 安全上岸! 2026-03-16 5/250 2026-03-18 15:33 by cmz0325
[考研] 化学工程321分求调剂 +15 大米饭! 2026-03-15 18/900 2026-03-18 14:52 by haxia
[考研] 302求调剂 +10 呼呼呼。。。。 2026-03-17 10/500 2026-03-18 12:45 by Linda Hu
[考研] 299求调剂 +5 △小透明* 2026-03-17 5/250 2026-03-18 11:49 by 尽舜尧1
[考研] 有没有道铁/土木的想调剂南林,给自己招师弟中~ +3 TqlXswl 2026-03-16 7/350 2026-03-17 15:23 by TqlXswl
[论文投稿] 有没有大佬发小论文能带我个二作 +3 增锐漏人 2026-03-17 4/200 2026-03-17 09:26 by xs74101122
[考研] 考研调剂 +3 淇ya_~ 2026-03-17 5/250 2026-03-17 09:25 by Winj1e
[考研] 327求调剂 +6 拾光任染 2026-03-15 11/550 2026-03-15 22:47 by 拾光任染
[考研] 294求调剂 +3 Zys010410@ 2026-03-13 4/200 2026-03-15 10:59 by zhq0425
[考研] 288求调剂 +4 奇点0314 2026-03-14 4/200 2026-03-14 23:04 by JourneyLucky
信息提示
请填处理意见