f******n
发帖数: 640 | 1 【 以下文字转载自 Chemistry 讨论区 】
发信人: facedown (不要脸了), 信区: Chemistry
标 题: 求审稿呀，关于fuel cell, polymer morphology, Nafion
发信站: BBS 未名空间站 (Tue Mar 10 03:19:07 2015, 美东)
本人phd专业是fuel cell, polymer morphology, Nafion, 文章发了一些，也曾经帮老
板审过一些文章
希望得到版上大牛的帮助，累积审稿经验。希望能站内邮件，会提供更详细的资料，如
果有机会拿到审稿的话，一定会感激不尽！ |
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f******n
发帖数: 640 | 2 本人phd专业是fuel cell, polymer morphology, Nafion, 文章发了一些，也曾经帮老
板审过一些文章
希望得到版上大牛的帮助，累积审稿经验。希望能站内邮件，会提供更详细的资料，如
果有机会拿到审稿的话，一定会感激不尽并有答谢！ |
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O*R
发帖数: 609 | 3 nafion在pH 6-8，含有0.1M NaCl的体系中稳定吗～？ |
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n**l
发帖数: 49 | 4 【 以下文字转载自 Macromolecules 讨论区 】
发信人: nkgl (面壁思过), 信区: Macromolecules
标 题: 请问关于 Nafion NR-50 ion exchange resin 的问题, 谢~`
关键字: NR-50
发信站: BBS 未名空间站 (Fri Jan 29 10:33:15 2010, 美东)
使用之后, 用高浓度盐酸处理, 可是resin都变黄了, 不知道为啥?
怀疑是自己用的酸浓度太高了? 有没有用过的同学给讲讲应该怎么处理
小弟谢了先 |
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f******n
发帖数: 640 | 5 本人phd专业是fuel cell, polymer morphology, Nafion, 文章发了一些，也曾经帮老
板审过一些文章
希望得到版上大牛的帮助，累积审稿经验。希望能站内邮件，会提供更详细的资料，如
果有机会拿到审稿的话，一定会感激不尽！ |
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j****C
发帖数: 72 | 6 I don't know where you got this reference,honestly I cannot understand what
you are doing. In yours citation Nafion is used and therefore you are
working PEM fuel cell(?), but Idon't know why you add the ink with some KOH
which will have chance to covert H-Nafion to Na-Nafion without proton
conductivity. At fuel cell industrials, CCM is standard electrode
preparation method. |
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j****C
发帖数: 72 | 7 I don't know where you got this reference,honestly I cannot understand what
you are doing. In yours citation Nafion is used and therefore you are
working PEM fuel cell(?), but Idon't know why you add the ink with some KOH
which will have chance to covert H-Nafion to Na-Nafion without proton
conductivity. At fuel cell industrials, CCM is standard electrode
preparation method. |
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C***S
发帖数: 175 | 8 Thanks.
My purpose is to calculate the TFE sequence length in Nafion, which
is crucial for the crystalization of Nafion.
Based on this, we can cooperate our NMR data to propose a reasonable
morphology of Nafion. |
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o********e
发帖数: 34 | 9 I happen to read some papers talking about Nafion with scattering technique.
Not sure about the detial now.
My feeling is that the structure of Nafion depends on the hydration level.
Some people propose a series of different structures at different hydration
levels. However, those model is not well justified. Also the feature
of the scattering is not very rich enough to give more information.
This is going to be a tough job for you if you want to know the shape
of holes or clusters in Nafion. Do |
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f*******1
发帖数: 1 | 10 It's pretty interesting...
CALL it the yoga polymer: Nafion, a material used in some fuel cells, has an
unrivalled memory for contortions.
Tao Xie at General Motors in Warren, Michigan, has twisted and stretched a
Nafion strip into three distinct shapes, and found that it will revert to
each shape at the appropriate temperature.
Nafion becomes softer as it is heated. At 140 °C Xie stretched it into a
particular shape, which was locked in the polymer's "memory" as it cooled to
107 °C and stiffene |
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k****o
发帖数: 83 | 11 DuPoint的Nafion质子交换膜拿去做氢气燃料电池，真是糟蹋好东西。
燃料电池注定不会大规模商用，就凭离不开铂金属催化。这么昂贵的金属，大众化消费
不可能！
Nafion用在我的渗透电池内，寿命将大幅度延长。
谁知道哪家的阴离子交换膜做得好？ |
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j****6
发帖数: 207 | 12 有几篇文献搞不定啊。谢过先。
z***********[email protected]
Observation of Interface Between Pt Electrode and Nafion Membrane
J. Electrochem. Soc., Volume 150, Issue 2, pp. A193-A198 (2003)
http://scitation.aip.org/getabs/servlet/GetabsServlet?
prog=normal&id=JESOAN00015000000200A193000001&idtype=cvips&gifs=yes&ref=no
In situ Infrared Reflection Absorption Spectroscopy Studies of the
Interaction of Nafion® with the Pt Electrode Surface
Volume: 217 | Issue: 5 Cover date: May 2003 Page(s): 513-526
http://www.olde |
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c******c
发帖数: 51 | 13 直接滴上，空气晾干或者柔和氮气流吹干即可，Nafion会把particles粘在GC表面的，
当然，GC表面需要预先磨及超声处理一下。 如果是金电极表面，连Nafion都省了。 |
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q***i
发帖数: 170 | 14 来自主题: Macromolecules版 - 一点疑问？ 如果是做离子导电类的实验， Nafion是目前最好的。
Nafion是目前最好的聚合物电解质膜。 |
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C***S
发帖数: 175 | 15 Yes.
I am working on NMR and we find the model of Nafion is somewhat
not in detail enough. And we think the clusters in Nafion is somewhat
not in spherical. So, we want to find a computation method to calculate
the SAXS profile and compare with the experimental SAXS data.
Now what I am looking for is to generate some geometry model, say cylinders
ditributed in space, and computate the profile.
I do not want to generate the atomic level accuracy. |
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C***S
发帖数: 175 | 16 More specifically, can X-ray or Neutron scattering tell the difference of
polymer in water from water in polymer system. In my case, it is Nafion
ionomer.
Some groups think even in dry state, Nafion still has the polymer in water
structure. I think it is weird. As the Babinet priciple states: due to the
autocorrelation property of scattering, we cannot tell the positive or negtive
image. So A in B case will give the same scattering as B in A.
Am I right? |
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C***S
发帖数: 175 | 17 No. I am working on Nafion system, the chemical formula is
((CF2)6.5CF(CF2)6.5)n
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OCF2CF(CF3)OCF2CF2SO3H
I just read the paper, which claims that even at low level hydration level,
Nafion morphology is composed by polymer aggregates dispersed in water. To me,
this is nonsense. So I checked their original paper. In that paper,
they substitute H+ with N(CH3)4+, and do SANS experiments at different H2O/D2O
ratio. After that, they normlized all the SANS profile with 100% H2O, so t |
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b*******n
发帖数: 29 | 18 Could you provide the exact paper citation, or tell us more about
the sample composition? Is it one-phase binary system, which is almost
impossible?
By the way, for Nafion ,
((CF2)6.5CF(CF2)6.5)n
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OCF2CF(CF3)OCF2CF2SO3H
if n is not too large, I believe Nafion can be treated as surfactant.
Then the phase behavior and SANS model have been widely investigated
in the literature.
Good luck.
me,
D2O
they
one |
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C***S
发帖数: 175 | 19 JPC-B, 106(12), 3033-3036,2002
this is the paper they differentiates these two models.
Nafion is a two phase system once hydrated. Well, the accepted model
is that it is a three-phase system under 15% by weight of hydration,
above this level, it is a two-phase system.
n would be 1000~10000. this is a estimated value since Nafion
can not form true solution. |
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k****o
发帖数: 83 | 20 DuPoint的Nafion质子交换膜拿去做氢气燃料电池，真是糟蹋好东西。
燃料电池注定不会大规模商用，就凭离不开铂金属催化。这么昂贵的金属，大众化消费
不可能！
Nafion用在我的渗透电池内，寿命将大幅度延长。
谁知道哪家的阴离子交换膜做得好？ |
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c******h
发帖数: 4573 | 21 燃料电池种类很多，我估计机车上用的不是普通的proton exchange membrane 比如
Nafion之类的燃料电池。这个因为机车自重，承载可以做比较大盐熔融的高温燃料电池。
氢气来源很多，其实大型的stational 的燃料电池就用重整煤气或者天然气都可以职氢
（其实这也是主要的工业氢气来源）。才没有什么电解水制备氢气这么昂贵复杂的方法
。不过要是核电站建多了，也未尝不可。 |
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p**y
发帖数: 95 | 22 fuel cell最贵的是半透膜Nafion. |
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c******h
发帖数: 4573 | 23 如果要用氢能源，必须大建核电厂
氢气储存不是问题，也不会爆炸。关键是能量密度也偏低，储氢设备需亚高压钢瓶。这
也是死重量。
电极的催化剂效果最好的还是Pt，但是Pt储量有限，如果催化剂问题不解决，可能氢能
源家用车不好普及。
侄子交换膜，目前PEMFC使用最广泛的还是Nafion或者类似结构的PEM，这个材料高温下
性能不是太好，低温启动也是问题。 |
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P*C
发帖数: 6109 | 24
nafion这种polymer的膜肯定不适合长期使用 高温更不用说 必须得上ceramic的膜
不知道这帮搞燃料电池的怎么忽悠丰田上的项目 |
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f*****m
发帖数: 425 | 26 把联系方式发给我吧，我已经投了一篇，如果被拒，投其他杂志可以加你 |
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D********a
发帖数: 795 | 27 redox flow cell 可以吗？电化学 |
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f******n
发帖数: 640 | 34 有兴趣的朋友请站内邮件我你的邮箱和一小段介绍（用来回复invitation和推荐）
谢谢了
Manuscript Abstract:
Electron beam cross-linked pore-filling electrolyte membranes (PF membranes)
with highly concentrated sulfonic acid groups were prepared by a modified
pore-filling method and an electron beam irradiation method. The pores of
the polyethylene microporous membrane were filled with cross-linked polymer
electrolytes with a high ion exchange capacity (5.1 meq g-1), derived from
poly(p-phenylene sulfonic acid-ran-2,5-benzophenone), vin... 阅读全帖 |
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l***f
发帖数: 618 | 36 稳定，不稳定还能做质子交换膜和氯碱工业的反应膜么？ |
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s*******h
发帖数: 3731 | 41 只要你能做出下一代nafion，钱途大大地。。。 |
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c******h
发帖数: 4573 | 42 你觉得有可能有超过Nafion的么？
从structure-property-performance来看。。。
这个作为质子交换膜，没啥可发展的了，顶多是细枝末节上稍微修饰。 |
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s*******y
发帖数: 572 | 43 文献中是这么介绍制备方法的：
2@C (45.0 mg) was introduced into a high-density polyethylene container (5
mL) together with water (1.0 mL), KOH (99.99% Sigma-Aldrich) (65.0 mg),
absolute ethanol (99.8% Fluka) (0.50 g) and 5% Nafion® ion-exchange
resin in alcohol solution (Sigma-Aldrich) (0.37 g). The resulting suspension
was sonicated for 30 min with a Branson 3200 bath. The suspension was
always freshly prepared. The metal loading on glassy carbon electrode was
determined by weighting the amount of ink de... 阅读全帖 |
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s*******y
发帖数: 572 | 44 文献中是这么介绍制备方法的：
2@C (45.0 mg) was introduced into a high-density polyethylene container (5
mL) together with water (1.0 mL), KOH (99.99% Sigma-Aldrich) (65.0 mg),
absolute ethanol (99.8% Fluka) (0.50 g) and 5% Nafion® ion-exchange
resin in alcohol solution (Sigma-Aldrich) (0.37 g). The resulting suspension
was sonicated for 30 min with a Branson 3200 bath. The suspension was
always freshly prepared. The metal loading on glassy carbon electrode was
determined by weighting the amount of ink de... 阅读全帖 |
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f******n
发帖数: 640 | 45 自己顶哈
谢谢各位大侠，如果有相关方向的机会转让给我，小弟会重谢啊~~ |
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q***i
发帖数: 170 | 46 来自主题: Macromolecules版 - 一点疑问？ Nafion
((CF2CF2)6.5CF2CFOCF2CF(CF3)OCF2CF2SO3H,
or it's family. |
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g******g
发帖数: 16 | 47 来自主题: Macromolecules版 - 一点疑问？ 谢了，请问Nafion是不是最好的选择？
因为，我的样品就是Nafion117. |
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y***e
发帖数: 6082 | 48 USM is very famous for industry, especially for organic coating, so job-huntin
g is very easy, three guys graduated from our group got a lot good offers, suc
h as Johnson, GE, Roman Hoss, Dow; Actually academic is a little weak, McCormi
ck is good for water-soluble polymer, Mauritz is good for Nafion, Hoyle is goo
d for photopolymerization (he is a very very very nice prof, just like a father
who will care his students very much even you are not in his group for everyth
ing such as recommendatio |
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C***S
发帖数: 175 | 49 Last question first.
Once you keep Nafion in ambient condition, it is soft.But in dry state,
it is kind of rigid film. this can happen in a minute. When you handle this
film, the sweat from your hand can also change the film.
From NMR, we have some idea of what the clusters look like, so we want to see
if we are right, what the SAXS profile would be. |
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b*******n
发帖数: 29 | 50 The phase separation in a binary system will keep going till
it reaches two layers. SANS of a two phase sample, especially
a low viscosity sample, is very noisy and hard to reproduce.
Nafion cannot be considered as surfactant(n is tooo large) then.
Let me quickly go through the paper first. |
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