17 Questions 10 Answers 0 Followers
Questions related from Chao Wang
Hi everyone, I have been trying to synthesis Al2O3 shperes by hydrolysing aluminium isopropoxide in IPA. However, I got some trouble in dissolving 100mg aluminium isopropoxide into 80ml IPA....
31 December 2020 3,822 0 View
Hi, guys. Recently, I was doing research on mesoporous silica. I used the traditional ingredient to synthesis it, namely TEOS, CTAB, ammounia aqueous, ethanol and water. To my surprise, when I...
09 July 2019 10,105 5 View
hi everyone, i have been doing research that needs to measure the specific surface area(SSA) of the sample. However, after i measured the same sample 3 times, there is an error between the...
04 December 2017 824 5 View
I used light scattering to examine alkynyl-end capped PEO chains with Molecular weight of 10000g/mol in aqueous solution(0.8mg/ml). However,as common sense suggests, polymer chains should be...
16 November 2016 9,356 2 View
My system is polymer aggregates formed by two types of polymer chains via hydrogen-bonding in aqueous solution, which is a phase-separated system. I want to figure out the Rg of the aggregates in...
29 October 2016 7,981 3 View
I've been doing hydrolyze a PtBA polymer into PAA. I found there are many researchers doing this with TFA in DCM solution of PtBA. However, I tried this method for several times, the solution of...
06 September 2016 2,783 2 View
I wanted to determine the Mw and Rg of PNIPAAM with static light scattering(SLS) in aqueous solution.The Mn of PNIPAAM is about 10000g/mol according to HNMR and GPC results. But somebody says...
04 May 2016 1,628 4 View
It is known that PNIPAAM has an LCST at ~32 centidegrees in aqueous solution. However, as the concentration get higher and the molecular weight get lower, the LCST will be get lower. When...
14 January 2016 3,020 4 View
I have been trying to measure the Rg value of poly acrylate acid with a molecular weight of 5000 using SLS instrument. However, I got several negative KC/R values, which made me not be able to...
10 February 2015 2,649 7 View
I wanted to synthesize some polymer of a particular Mn, but when I characterized it with GPC, I found there were two peaks which overlapped with each other. I heard there is a method called...
23 January 2015 2,678 5 View
I have been doing synthesis of PNIPAAM in different molecular weight. The precipitation is really a tough problem. Because I couldn't separate the monomer from the polymer clearly with ethyl...
05 November 2014 8,701 4 View
PEO 8000 can dissolved in water easily, but I wanted to modify it in THF. I put the suspension overnight and there were no significant changes. Can anyone give me some advice?
07 August 2014 7,992 4 View
I've been making star shaped polymers, but the core molecule which is poly-alcohol or poly-carboxylic acid does not dissolve in solvents like THF, DMF, or CH2Cl2. I cannot modify them and do next...
18 June 2014 5,672 5 View
I am about to carry on a click reaction. I heard of that NaN3 is a dangerous compound which is easily explodable, and HN3 is as poisonous as HCN! What details should I pay attention to? Can you...
29 May 2014 3,350 5 View
I want to know the dispersion of the nanoparticles mixed in the polymer membranes, how could I do with it? I tried to paste the micrometer-scale-thick membrane on the electric-conductive tape to...
17 May 2014 1,728 10 View
I've been doing molecular imprinting experiment. It is a core-shell structure, i.e.surface imprinting. But UV-vis cannot see any difference before and after adsorption. Does the cavity of molecule...
21 February 2014 2,796 1 View
In my experiment , I want to measure the size of micelles, can I use TEM to observe it?
17 February 2014 6,949 7 View
