Zheng Zheng

5 Questions 12 Answers 0 Followers

Questions related from Zheng Zheng

Strategies for concentrating HPLC fractions (large nucleotides)?

I am currently trying to characterize shortmers of large nucleotides (up to 10k bases) from HPLC fractions and the samples I have available are of very low concentration, especially after fraction...

08 December 2023 6,172 2 View

How do I adjust needle/gripper alignment of Agilent 1260 [G1329B] autosampler?

I'm running into an issue with the 1260's standard autosampler [G1329B] where the needle's point-of-entry into an HPLC vial is too close to the edge of the septum. It almost hits the lip of the...

12 January 2022 8,668 1 View

Are there plasticizers suitable for use with perfluoronated compounds like Nafion, Teflon AF or other fluorosilanes?

I'm trying to soften and improve the behavior of a glassy, fluoronated polymer for a permselective membrane and also potentially incorporated Nafion in the membrane to improve ionic conductivity....

13 July 2015 1,090 3 View

Can anyone recommend any vendors selling anionic exchange membranes?

I'm looking for an anionic ionomer membrane. Solvay used to sell a perfluoro quaternary ammonium membrane called "Morgane-ADP", but it has been discontinued for some time now. All other exchange...

07 November 2014 3,527 9 View

Nafion: Did the distributor send me the wrong membrane?

I recently purchased a Nafion 117 membrane from FuelCellsEtc and tried to perform a chemical deposition of Pt and Au in the membrane. I have a diffusion cell to perform the deposition with the...

22 May 2014 5,409 5 View