Chao Wang

11 Questions 9 Answers 0 Followers

Questions related from Chao Wang

How to fully dissolve aluminium isopropoxide in isopropyl alcohol(IPA)?

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 3,771 0 View

Does mesoporous silica NP dissolve in water?

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 10,055 5 View

How accuracy is the BET measurement?

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 782 5 View

How can I choose a proper model for fitting my SANS data?

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 7,937 3 View

How to fully hydrolyze PtBA into PAA?

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 2,745 2 View

What is the lower limit of Mw that static light scattering can determinate ?

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 1,586 4 View

How to dialyze PNIPAAM?

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 2,988 4 View

Why do I obtain negative KC/R values in Static Light Scattering measurement?

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 2,589 7 View

Does anyone know about fractional precipitation?

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 2,643 5 View

What should be bare in mind when carry out an "alkynyl and NaN3" click reaction?

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 3,312 5 View

How can I characterize nanoparticles/polymer membrane?

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 1,690 10 View