L*****e
发帖数: 288 | 1 Solvent Extraction and Ion Exchange, Volume 27, Issue 2 March 2009 , pages
107 – 131
Solvent Extraction and Ion Exchange, Volume 27, Issue 5 & 6 September 2009 ,
pages 579 - 606
Solvent Extraction and Ion Exchange, Volume 28, Issue 2 March 2010 , pages
184 – 201
Solvent Extraction and Ion Exchange, Volume 28, Issue 3 May 2010 , pages 350
– 366
Solvent Extraction and Ion Exchange, Volume 23, Issue 3 May 2005 , pages 319
– 344
Solvent Extraction and Ion Exchange, Volume 23, Issue 2 March 2005 , pa |
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c******x
发帖数: 438 | 2 I cannot input chinese now, I saw the thread below discussing how to remove
the residual solvent.
http://www.mitbbs.com/article_t1/Chemistry/31280475_0_2.html
I have a silmiar problem, and the solvent is encapuslated inside polymer.
Here is what I did:
A polymer (Tg ~ 270C) with 1% N-methyl pyrrolidone (NMP) solvent residue.
This polymer can dissolve in THF, but not in water, methanol and acetone. We
tried purification of this polymer by dissolving it in THF, then
precipitated the solution in an |
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A******y
发帖数: 2041 | 3 Just get a combiflash system for prep-HPLC, it save a bit of solvent. Are
you sure that your institution will allow solvent recovery system to be
installed? It is usually a distillation system and could be dangerous if
not properly used. |
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b****n
发帖数: 379 | 4 如题，合成出来的产物是gel，应该是有N,然后和alcohol solvent 产生了氢键。怎样
才能除掉这些solvent，让它变成powder呢？没经验，多谢指点！ |
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D***e
发帖数: 435 | 5 polymer 的brush thickness in good solvent
这个good solvent是怎么定义的？
是说在这样的溶剂里polymer segment之间一旦他们重叠就互相排斥吗？
多谢指教 |
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c******d
发帖数: 906 | 6 国内的朋友急需一批HP 2580 solvent printer cartridge
如果有能供货的最好，或者指点一下怎么买
不胜感激 |
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n****n
发帖数: 36 | 7 当道琼斯指数在1929年末达到了300点左右的最高位时，用 Hussman 的模型估算出的股
市未来十年的平均回报率是负值。之后道琼斯指数下降了一半、到了150点，那时估算
出的股市未来十年的年平均回报率是10%。可是此后两年股市继续下跌了三分之二，
1932年道琼斯指数在不到50点时触底，从顶到底总共下降了80%多。
股市经过了几年的强劲反弹，在1937年3月道琼斯指数回升到了194点，用模型估算出的
股市未来十年的平均回报率是6%，Shiller P/E 值是23。当时凯恩斯断定“在我们的时
代不会再有股市暴跌了”（"We will not have any more crashes in our time." ）
。他说到做到，除了全资购买股票之外，还借用了融资。不料道琼斯指数在之后的一年
里又下跌了大约一半，1938年3月，道琼斯指数回降到了100点，凯恩斯的投资损失了三
分之二。
这时候，模型估算出的股市未来十年的平均回报率增加到了14%，道琼斯指数在之后的8
个月里上涨了50%，然后在后面的几年里又经历了数次20-30%之间的起伏震荡。
凯恩斯总结自己炒股赔钱的教训时说,“... 阅读全帖 |
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g**********r
发帖数: 422 | 8 Development of a PDMS-grafted alumina membrane and its evaluation as solvent
resistant nanofiltration membrane"
Journal of Membrane Science
请把简历发到k******[email protected] |
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S***Z
发帖数: 1029 | 9 N年前买第一支枪的时候一起买的Cleaning Kit，里面有一瓶No.9，一瓶润滑油。我现
在一直用CLP，而且一般都是打完就擦，觉得Solvent好像没啥用。各位说说？ |
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k*****G
发帖数: 697 | 10 一直以为No.9 Solvent是用来清理残留火药加铜粒，兼防锈。擦完枪关键部位各加一
drop的gun oil。So far感觉还不错，Glock做为手枪里的劳模不是白当的，哈哈...... |
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s*********r
发帖数: 4210 | 12 一般用着Hoppe No.9 Solvent的飘过。。 |
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h*******o
发帖数: 1114 | 15 KM4是什么solvent?怎么查不到阿？有polymer 的同志们知道吗？谢谢！ |
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m****o
发帖数: 310 | 22 Hydrogen bonding is heavily formed between R-COOH and water. Is there any
solvent that can reduce/break the H-bond formation? Thanks.
I don't think Ethanol and DMSO will help. |
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s**********e
发帖数: 2888 | 23 问一下：实验室计划买一套preparative HPLC，所以也想买一套solvent recovery
system，这样可以节约溶剂。大家谁有用的？有什么可以推荐的？
这个系统是不是可以把hplc出来的带有化合物的混合溶剂分离成比较纯的溶剂，这样可
以回收再用来做hplc分离？
最好是自动化程度比较高的，因为实验室正好有一笔钱可以买比较贵的设备。 |
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w******r
发帖数: 43 | 24 Are there any common solvents which are immiscible with freon?
3x |
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v*****e
发帖数: 134 | 25 What organic solvent dissolve polyglycine (or polyalanine) besides CF3COOH
or similar organic acids?
Many thanks |
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J*****n
发帖数: 179 | 26 Hi folks
I'm looking for organic solvents which can form strong hydrogen bond with
the oxygen of carbonyl(C=O) in ester group. Do you guys know some candidates?
Thanks for help in advance. |
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t****1
发帖数: 232 | 27 high temperature might disrupt H-bonding, but 90-100C should be fine. In
order to prove the existance of H-bonding, you can try to do some FT-IR with
the mixture of your monomer and solvents. The carbonyl peak should show up
around 1710cm-1 and there will be a distinctive shoulder upon the peak once
there is H-bonding formed with carbonyl group. For details, you can check my
paper (DOI: 10.1021/ma1009963) |
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q********g
发帖数: 10694 | 28 Constant pH Simulation
First, check your assumptions. The ideal situation would be to have a
constant-pH algorithm to perform the MD simulations. However, conventional
explicit-solvent MD algorithms cannot do that, since they're constant-H+
algorithms. Furthermore, if you use a MM force field, you will never get
protonation/deprotonation of sites in your solute: free H+ will just wander
around, while titrable sites are stuck with their initial protonation states
; if you want to overcome this yo... 阅读全帖 |
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c*******d
发帖数: 198 | 29 刚查到的一些信息：
http://www.americanpregnancy.org/pregnancyhealth/paintexposure.
What about pregnancy and household paint use?
The most common question related to pregnancy and paint exposure has to do
with painting the new baby's nursery or decorating the house before the baby
arrives. Unfortunately, there are no studies that document the effects of
household painting on pregnancy and the developing baby.
Currently, the assumption is that household painting involves very low
levels of exposure. The re... 阅读全帖 |
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i***e
发帖数: 9429 | 30
不用图了，你说的和我估计的一样，因为没看到过，很有兴趣想知道个究竟。谢谢你。
后来去看了我们当地的Plumbing Code 和 IPC， CPVC 的确可当 热水管用，正好看到
一段怎么连接，你可以参考一下。相信我们大家都没什么经验，这管子里是有水压的，
做的要仔细点。注意看605.16.2.
D 2846/D 2846M—99 Specification for Chlorinated Poly (Vinyl Chloride) (CPVC
) Plastic Hot and Cold Water Distribution Systems . . . . . . Table 605.3,
Table 605.4, 605.16.2
B137.6—99 CPVC Pipe, Tubing and Fittings for Hot and Cold Water
Distribution Systems—with Revisions through May 1986 . . . . . . . Table
605.3, Table 605.4
605.16 CPVC plastic. ... 阅读全帖 |
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r********h
发帖数: 5638 | 31 Reverse osmosis (RO) is a water purification technology that uses a
semipermeable membrane. This membrane technology is not properly a
filtration method. In reverse osmosis, an applied pressure is used to
overcome osmotic pressure, a colligative property, that is driven by
chemical potential, a thermodynamic parameter. Reverse osmosis can remove
many types of molecules and ions from solutions, and is used in both
industrial processes and producing potable water. The result is the solute
is retai... 阅读全帖 |
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w********h
发帖数: 12367 | 32 no...
there is difference between non-solvent and no-good solvent.
generally no-good solvent means theta-solvent.
as to PS, methylcyclohexane is a theta-solvent while toluene is a good one. |
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B******1
发帖数: 9094 | 33 Actually the boxed to hol organic solvent (hexane, ethyl acetate, toluene
and methylene chloride) are the best moving boxes you can have.
1) Those boxes are very sturdy sine each box can hold at least 16 gallons of
solvent.
2) Since the solvent bottles are sealed. There is no lead. Even if there is
a leak, those solvents evaperate quickly at room temperature or under the
SD sun.
3) Some boxes even have two "holes" on the sides for the hands to hold the
box.
4) I used these boxes to move home st... 阅读全帖 |
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f****n
发帖数: 95 | 34 我在为含氟的丙烯酸酯/丙烯酰胺类高分子寻找good solvent,发现trifluoroacetic
acid (TFA)的溶解能力特别强，很好用。可是，高分子（白色粉末）溶解于新鲜的TFA
之后溶液由无色透明慢慢变为淡黄色透明。
是不是因为TFA是强酸有所谓的发烟现象？浓盐酸就是淡黄色，因为含有少量杂质Cl2
。另外， 含卤素或含硝基的化合物容易变颜色,是少量变质导致的吗？
谢谢！
p.s.
查到有这么一句：“olutions of proteins in trifluoroacetic acid prepared in
vacuo
are clear and colourless; on exposure to air, a purple colour develops.”不
解中···
Nature 174, 509 (11 September 1954); doi:10.1038/174509a0
Anhydrous Trifluoroacetic Acid as a Solvent for Proteins
JOSEPH J. KATZ
Chemistry Di... 阅读全帖 |
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b*o
发帖数: 47 | 35 I am very interested in this and looking forward to your publication. In
Edwards' derivation, I think the attraction part has the physical origin of
the monomer space packing entropy de Gennes mentioned. The polymer chain in
melt (supposedly polymer good solvent, i.e., kai=0) and in theta solvent both
shrink from that in good monomer solvent, but with different physical driving
force: entropy in the melt case while enthalpy in the theta solvent case, I
think.
off.
=
correlation
of
interaction
i |
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w********h
发帖数: 12367 | 36 thanks for your further clarification.
as to monomer slovents (here it just means the small molecular weight solvents
generally), they can be good, theta, poor, or even non-solvents.
if it means the exactly the monomer of the solute polymer chain,
generally we think it is good solvent.
the thing is:
when the solvent chain (or matrix chain) changes from a monomer to a polymer
chain as the solute chain, what happens there?
Good---->theta---->all theta to polymer in itself?
take
a
a
was
this
as
ch |
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M********I
发帖数: 848 | 37 What is PEX?
PEX is cross-linked polyethylene. Through one of several processes, links
between polyethylene molecules are formed to create bridges (thus the term "
cross-linked). This resulting material is more durable under temperature
extremes, chemical attack, and better resists creep deformation, making PEX
an excellent material for hot water and other applications.
How long has PEX been used?
PEX was developed in the 1960s. PEX tubing has been in use in many European
countries for plumbing,... 阅读全帖 |
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s****n
发帖数: 211 | 38 为了逃避审查, 不良厂商曾把苏丹红改过几十个名字.
Atul Orange R
Benzene-1-azo-2-naphthol
Brasilazina oil Orange
Brilliant oil Orange R
Calcogas M
Calcogas Orange NC
Calco oil Orange 7078
Campbelline oil Orange
Carminaph
Ceres Orange R
CerotinOrange G
CI Solvent Yellow 14
C.I. Solvent Yellow 14
Dispersol Yellow PP
Dunkelgelb
Enial Orange I
Fast oil Orange
Fast oil Orange I
Fast Orange
Fat Orange I
Fett Orange 4A
Grasal Orange
Grasan Orange R
Hidaco oil Orange
Lacquer Orange VG
MotiOrange R
Oil Orange
Oleal Orange R
Oran... 阅读全帖 |
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m****p
发帖数: 404 | 39 这个要求有点高
Research & Development Team Leader - Oilfield Chemicals and Solvents (4561)
JOB OPPORTUNITY:
Sasol (USA) Corporation has an opening for a Research & Development Team
Leader – Oilfield Chemicals and Solvents. This position will report through
the Research and Development Department located at the Lake Charles
Chemical Complex. Below are some details of the position requirements:
Position Responsibilities:
Manages a research & development team consisting of senior scientists and
laborat... 阅读全帖 |
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e***s
发帖数: 1397 | 40 大家都用什么，怎么擦枪啊？
我先来抛砖：
- 我一般是先用boresnake通两遍 - 在家用rod加brass brush或者Otis那种软的cable
，在field就用boresnake；
如果特别脏，先用Hoppe No.9 solvent通两遍 - 有时候上过solvent以后等一个晚上之
后再擦；
- 擦完枪管后，用No.9 lubricant擦在cleaning patch或者boresnake的尾巴上，再在
枪管里过一遍，防锈。
- 枪的其他部分，就用No.9 lubricant擦一遍防锈。
solvent和lubricant都是选择的No.9倒不是endorse他们的产品，就是尽量避免把不同
品牌的chemical混用 ...
我没怎么用过其他的牌子，Rem Oil, Otis, etc., 有第一手经验的达人出来给讲讲心
得和体会吧... |
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r**********1
发帖数: 1004 | 41 Hewlett Packard HP 1100 DAD HPLC System, 我还以为是呢
Agilent Technologies Inc, formerly Hewlett-Packard Company (HP), has launched 1100 Series for High-Throughput HPLC analysis. The 1100 is based on the successful modular design of the HP 1050 systems. Agilent 1100 series is one of the best designs in the industry because of the optimized design of the quaternary pump ensuring virtually pulse-free and stable solvent flow, with dual floating pistons in series, precisely servo-controlled. This design w... 阅读全帖 |
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c*****g
发帖数: 4747 | 42 不是偏见，我建议所有画油画的，小心点没有坏处，这种毒性是满满累积的，可以通过
皮肤渗透的，所以有人画画戴手套，现在还有一种油画专用的barrier cream，手霜一
样的东西，画画前涂到手上，跟手套同样的作用。
节选两段文章你看看，一段中文，一段英文的：
===============================
5. 其他油媒精劑
要特別注意的是 松節油 石油精 及 催乾劑
它們屬於有機溶劑 應該盡量避免在密閉空間使用 萬一有頭痛 頭昏 刺激 作嘔 嘔吐
窒息等症狀 應該立即到通風良好的地方
一般催乾劑中含有二氧化鉛 應避免接觸 並保持良好作畫習慣
上述等等物品 不使用的時候 應該保持密封 對較為敏感的人也應避免觸摸或戴上防護
裝備如手套等
================================
Turpentine and Substitutes
By Michael McCann, Ph.D., C.I.H.
Turpentine is the classic solvent used by artists in oil painting and for
clea... 阅读全帖 |
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s******y
发帖数: 28562 | 43 http://www.fetal-exposure.org/resources/index.php/1995/03/01/organic-solvents-and-pregnancy/
XYLENE
Xylene, also called dimethylbenzene or xylol, is an aromatic hydrocarbon
solvent commonly found in paints, lacquers and adhesives and also in
laboratories. After toluene, it is the most common solvent encountered in
the workplace (Brown-Woodman, 1991). A study of women working in pathology
or histology laboratories showed an association of xylene exposure with an
increased risk of spontaneous abor |
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l****5
发帖数: 2968 | 44 下面很多papers，没有学校账户查不到了。请大家帮忙查一下吧。请发greenfast2013@
gmail.com
包子不多，不过由于文章很多，所以会发包子以表感谢的。万分感谢啊！
1) Effects of high electric field pulses on enzymes
2) Neuropharmacological investigations on muscimol, a psychotropic drug
extracted from Amanita muscaria
3) Extraction of BaChu mushroom polysaccharides and preparation of a
compound beverage
4) The effect of the high pressure homogenisation on the activity and
stability of a commercial neutral protease from Bacillus subtilis
5) Isolation o... 阅读全帖 |
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E****F
发帖数: 10 | 45 Usually, people don't use 100% solvent as mobile phase, or it might minimize
the efficiency of the column. What we do is preparing 95/5 H2O/ACN with 0.1
% Formic Acid (or whatever you choose such as 0.1% TFA) as solvent A; 90/10
ACN/H2O with 0.1% Formic Acid as solvent B.
If you see some bubbles ocurring, that might be arised from your loading
pressure, flow rate,etc. One solution is to purge the chromatographic system
including loading and waste lines by using 2-propanol, then to increase the
f |
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l**********g
发帖数: 55 | 46 Given the viscosities and refractive indices of two miscible solvents, and
the volume ratio of the two solvents, how can I calculate the viscosity and
RI of the mixed solvent?
thanks!! |
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H********f
发帖数: 289 | 47 when you change solvents, did you change both aq and organic solvents at the
same time? If yes, also check the needle wash solvents--stuff from them
could also show up on LC/MS. |
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d********6
发帖数: 76 | 48 Sorry I cannot type chinese here.
The solvents need to be exquisitely dry in order to get a good yield.
You can buy those anhydrous solvents (pyridine, dioxane, tributylamine and
DMF) and dry them over newly activated molecular sieves.
An alternative way is to redistill the solvents freshly before reaction.
The phosphorylation reagents should be made under argon protection and
stored under 4 degree C (salicyl phosphorochlorodite), and -20 degree C (
tributylammonium pyrophosphate), respectively.... 阅读全帖 |
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q****i
发帖数: 6923 | 49 Preparation of almost dispersant-free colloidal silica with superb
dispersibility in organic solvents and monomers
Journal of Nanoparticle Research (2011), 13, (9), 3885-3897. Publisher: (
Springer, ) CODEN:JNARFA ISSN:1388-0764.
Effect of organic solvents on the preparation of silica microspheres by
hydrolysis of TEOS
Xiyou Jinshu Cailiao Yu Gongcheng (2007), 36, (Suppl. 1), 180-183.
Surface modification of colloidal silica particles
Colloid and Polymer Science (2001), 279, (2), 114-121.
Solubi... 阅读全帖 |
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w********h
发帖数: 12367 | 50 偶的意思是说“溶剂”分为三种：
(1)非溶剂（呵呵，non-solvent）;
(2)不良溶剂
(3)良溶剂
theta solvent属于（2），特定在theta温度下的稀溶液的情形，
但非溶剂不可以是theta solvent。
one. |
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