Irfan Ahmad

6 Questions 6 Answers 0 Followers

Questions related from Irfan Ahmad

Particles size distribution calculations using Python?

Does anyone know the python code to calculate D10, D50 and D90 from %retain of sieves? Thank you.

27 March 2024 9,185 2 View

Salt activity coefficient and solubility of a molecule ?

I used Sodium Chloride to change the ionic strength( Activity coefficient) of water. It also contains polycyclic aromatic hydrocarbon(PAH). The solubility of PAH in water is changing with the...

01 August 2019 7,186 2 View

Can XPS differentiate Ester and Carboxylic group ?

I gave PEG particles containing COOH. I want to perform XPS to quantify the COOH. Will XPS differentiate COOH from the ester bond in PEG ?

17 December 2018 3,553 3 View

Which on is the good solvent for precipitation ?

I have amidation reaction in DCM using DCC. I can separate the bi-product through centrifuge or filtration. I am wondering what is the best solvent to precipitate the product ? either using cold...

10 April 2018 4,794 4 View

Is there any simple model to find out the diffusion time in polymer film ?

My molecule is dissolved in water and I put it on one side of PEG-DA film. I am trying to estimate how much time it will take to diffuse to the other side of the film. Most of the models in...

19 April 2017 7,900 2 View

Which dye I should use to find the quantum yield of Pyrene ?

I used Rhodamine B to find the quantum yield of pyrene, but I got it wrong. I was reading some literature and it says that reference dye should resemble your dye ( expected QY and absorption...

13 March 2017 9,116 5 View