f********n
发帖数: 2 | 1 Can I ask you another question about the PNIPAM? I am trying to synthesis
PNIPAM microgels. From the literature, the "reactant NIPAM need to be
recrystallized frome Hexane/acetone solvent and the prodcuct need to be
precipitated by Hexane". I am so new about the polymer process and do not
understand what it mean recryliation and precipiation. Would you please tell
me tell me the recrystalliation process and precipation process in detail?.
Thank you so much
you |
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c******h
发帖数: 4573 | 2 我怀疑millpore的油膜会吸附PNIPAM
在THF中的PNIPAM过膜老是有灰尘。TNND
动态还好说，这个静态和zimm作图怎么办啊
55555555555 |
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f*****n
发帖数: 93 | 3 A general LbL strategy for the growth of pNIPAM microgels on Au
nanoparticles with arbitrary shapes
Soft Matter, 2012,8, 4165-4170
DOI: 10.1039/C1SM06396K,
Many thanks. |
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w******r
发帖数: 43 | 4 就是把混合溶液放在半透膜里面，然后把半透膜放到水里面，不停的搅拌，
用magnetic stir. 前几天每个几个小时换一次水。
以后每天换一两次就可以拉。
大概四天到一礼拜的时间就可以把小分子渗透出来。
然后你就得到了PNIPAM的水溶液了。
我以前做过几次，欢迎讨论！
into
run |
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w******r
发帖数: 43 | 6 transition between coil and globule with changing to quality of solvent has
been predicted by theory. B. Chu and he just showed the transtion by DLS. He
did this long time ago. But he characterized the exact transition temperature
of PNIPAM by using DLS. That was done by himself.
Anyway, he is cool. He has a paper about characterization of Teflon by using
fluorinated oligomer as solvent. If my memory is corrent, that is his PH.D.
Solution
大
的
变
问
化
分
构
分
系
多 |
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t*******n
发帖数: 66 | 7 很高兴你想考北大的高分子专业. 首先一个问题是北大现在很多是硕博连读. 所以每年招
收的博士生很少. 现在说一下导师的情况.
液晶高分子方向: 周其风负责人.博导. 但现在具体是范星河在带领次组. 词组主要是高
分字合成合成.此组较大, 主要用自由机聚合和缩聚. 贾芯如领导的Dendrimer小组也包括
在这儿.
功能高分子: 李子臣负责, 但目前还不是博导, 以别人的名义带博士. 目前有板有3-4个
博士. 主要研究两亲性嵌段共聚物. PEO-b-PNIPAM, PEO-b-Pgltycose. and
PS-b-Pglycose PS-b-PEO etc. 还有他们的自组装.产品主要用ATRP, RAFT and 高分字反
映合成. 另外一个老师是杜福胜, 今年从Arkon回国, 主要方向是光敏性高分子的合成.
超分子研究组: 宛新华, 博导. 2002年从周其风组分离出来.
主要研究夜晶高分子和Coil-Rod polymers and their self-assembly behaviors. 主要
用自由机聚合和高分字反应.
光化学组: 由曹维孝带领.博导./ 主要研究 |
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b**s
发帖数: 589 | 8 ... To make the chips, researchers started with a thin slide of glass, on
which they built arrays of microheaters using lithographic techniques. They
then deposited poly-N-isopropylacrylamide (pNIPAM), a temperature sensitive
polymer, onto the microheater arrays. At temperatures below about 90 degrees
Fahrenheit in a liquid environment, the polymer exists in a water-saturated,
gel-like state. But when the temperature exceeds that threshold, the polymer's
chemical properties change. It becomes wa |
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f********n
发帖数: 2 | 9 要用激光扫描显微镜观察PNIPAM, 但是需要fluorencent dyed.请问有谁知道用什莫物质
来dye 吗？而且这个dye 的选择标准是什莫？ 第一次接触这些东西，请指教。谢谢了。 |
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h**u
发帖数: 133 | 10
质
。
一般rhodamine或者fluorescein是confocal最常用的染料。他们有很多衍生物，比如带不
同的反应官能团，可以跟其他物质反应，比如带NCS基团的可以跟含胺基的材料反应。如
果你只需要物理混合，那就比较容易。如果你想要把dye标记到PNIPAM，可能需要找个带
荧光染料的单体，然后共聚。或者你的材料上想法弄出一些胺基羧基什么的。恩，建议你
上www.probes.com看看。 |
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c******h
发帖数: 4573 | 11 来自主题: Macromolecules版 - 很迷茫 吴奇不是利用光散射做了很多PNIPAM的研究？？
很多年以前了 |
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c*s
发帖数: 2145 | 12 看看hu zhibing的胶体晶体的文章，有时间看看PNIPAM的微球在水相有序排列的文章，
2000年后热过一阵，现在没啥新意了
可见光的波长几微米设呢意思 |
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f*****n
发帖数: 93 | 13 A general LbL strategy for the growth of pNIPAM microgels on Au
nanoparticles with arbitrary shapes
Soft Matter, 2012,8, 4165-4170
DOI: 10.1039/C1SM06396K,
Many thanks. |
|
