24小时热门版块排行榜    

查看: 3025  |  回复: 28
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

lo@丹丹@ve

金虫 (小有名气)

[求助] 求助200nm左右的二氧化硅球的做法 已有5人参与

现想以二氧化硅作为模板进行材料合成,相合成200nm左右的二氧化硅颗粒,但是现在的问题是合成出的二氧化硅均在400-500nm之间,求各路大神指导。
回复此楼
在实现理想的道路上,遇到挫折在所难免,但是只要不放弃,就一定可以实现心中的梦想。
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

1024285031

木虫 (著名写手)

【答案】应助回帖

???????:
7?: Originally posted by peihaimeng at 2015-04-10 17:25:26
????   ?????????200nm???????????????  ???????????   лл...

???????4?????????????????????????????????TEOS,????????????????????????????????????λ???????????????????????10h???????????????????羵?????????????????á????????????????4??ɡ?The preparation of different sized silica spheres involves the ammonia-catalyzed hydrolysis and condensation of TEOS in an aqueous ethanol solution via the classical st?ober method.21,22 Taking the synthesis of ∼190 nm silica spheres as an example, 15 mL of absolute ethanol, 5 mL of DI water, and 0.7 mL of 28% NH3 3H2O were mixed and stirred. A total of 0.6 mL of TEOS was added into the mixture quickly. After a reaction time of about 10 h, the silica spheres were isolated by centrifugation. Then the white precipitate was washed with ethanol three times.
8楼2015-04-10 20:16:03
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 29 个回答

zhangjun1988

金虫 (正式写手)

你好,请问你是用什么方法合成的,有参考文献吗?粒径大小和滴加速度也是有关系的。
为化学科研奋斗
2楼2015-03-28 09:03:49
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

风靡815

金虫 (正式写手)

【答案】应助回帖

往大做可以 要是把粒径往小做不容易,我合成一般在150nm左右 比较均匀的,200nm的话也能做出来 现在怎么能做到50nm左右 是个问题
nooneisperfect
3楼2015-03-28 09:41:40
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

nanofollower

专家顾问 (著名写手)

【答案】应助回帖

????????????Langmuir 2011, 27, 7185?C7191?????????????????????????
??鲿?????????The preparation of different sized silica spheres involves the ammonia-catalyzed hydrolysis and condensation of TEOS in an aqueous ethanol solution via the classical st?ober method.21,22 Taking the synthesis of ∼190 nm silica spheres as an example, 15 mL of absolute ethanol, 5 mL of DI water, and 0.7 mL of 28% NH3 3H2O were mixed and stirred. A total of 0.6 mL of TEOS was added into the mixture quickly. After a reaction time of about 10 h, the silica spheres were isolated by centrifugation. Then the white precipitate was washed with ethanol three times.
4楼2015-03-28 09:56:35
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
[基金申请] 欢迎发来filecode的Mz6后的代码验证其规律 +50 医学老男孩 2026-08-13 108/5400 2026-08-18 16:49 by eulota
[教师之家] 两姐妹,一个辛辛苦苦30岁工作当大学教师,另一个23岁就工作当开车教练 +3 瞬息宇宙 2026-08-11 7/350 2026-08-18 16:42 by LNP@mRNA
[基金申请] 重要消息,中午系统在维护 +8 yuleib84 2026-08-18 9/450 2026-08-18 16:33 by 撸猫猫
[基金申请] 时间戳变了,能看出什么问题? +7 基诺咪客 2026-08-17 10/500 2026-08-18 16:24 by Lullabygxb
[基金申请] 明天放榜? +4 Shxjjxjkx 2026-08-18 4/200 2026-08-18 15:59 by abcabc1133
[基金申请] 时间戳又变了8-15 +14 archvillain 2026-08-15 26/1300 2026-08-18 13:37 by phantomgost
[基金申请] 今天维护系统维护 祝所有人 高中 +8 gjjjzhong 2026-08-18 9/450 2026-08-18 13:01 by 家与远方
[基金申请] 哪位老哥知道今年的国自然具体哪一天放榜? +13 Ldrop2023 2026-08-13 16/800 2026-08-18 12:25 by 淀粉搬运工
[基金申请] 2027广东省杰青 +3 奶牛小黑 2026-08-15 8/400 2026-08-18 11:47 by gltch
[基金申请] 93BebMhtakh前后11位开头都是大写 +4 且听虎啸 2026-08-17 5/250 2026-08-18 00:49 by 蔡棒棒菂
[基金申请] 感觉是下周放榜了 +6 angus9576 2026-08-17 11/550 2026-08-17 23:57 by angus9576
[基金申请] filecode=后面第一个是大写字母 +8 wangze12014 2026-08-14 10/500 2026-08-17 17:05 by xter9665
[基金申请] 咱们一起用铁证分析2026国家社科基金中标与否 +7 启萌科技 2026-08-12 26/1300 2026-08-16 12:35 by 启萌科技
[精细化工] 招聘 金属平磨液,抛光液研发工程师 +3 小天0311 2026-08-14 3/150 2026-08-16 07:31 by H9PLUS
[基金申请] 各位道友,我要去昆明玩几天,回来见。 +7 Tide man 2026-08-14 8/400 2026-08-15 01:11 by arzu_hma
[基金申请] 是这周出结果还是下周出结果? +4 yuleib84 2026-08-11 4/200 2026-08-14 23:05 by lfy8008
[基金申请] 不应该看fileCode +7 且听虎啸 2026-08-12 9/450 2026-08-13 14:27 by flydreamws
[基金申请] Filecode 又变了,巨变 +3 WH3796 2026-08-12 4/200 2026-08-13 14:13 by 小木虫6752397
[基金申请] 结合人工智能,周易传统文化,filecode打分制来了,3分以上希望很大。 +3 Tide man 2026-08-12 4/200 2026-08-13 08:35 by ZJTJZ
[基金申请] 2019年青年基金涵评意见,大家看看几个A,几个B? +11 Tide man 2026-08-11 11/550 2026-08-13 07:35 by 撸猫猫
信息提示
请填处理意见