16 Questions 21 Answers 0 Followers
Questions related from Fatima Ahmad
i am a bit confused about the relationship betwern hydrophobicity and oleophicity, Initially I thought if a material is hydrophobic it should also be oleophilic and vice vera but that doesn't...
05 May 2019 9,701 6 View
I am trying to understand how to make a polymer surface hydrophilic and oleopohobic. I will choose a polymer that has polar functional groups so it will be hydrophilic but i will need to make it...
03 March 2019 2,782 4 View
Electrospun membranes appear to be increasingly popular for water treatment applications. I under how they are fabricated, etc but Im not quite how they are used, I would be grateful if someone...
02 February 2019 3,788 2 View
Im learning about TGA, can someone explain in simple terminology the reasons for the difference in thermal behaviour exhibited by the same polymer in different conditions? Im looking to...
10 October 2018 7,374 4 View
I have some basic questions about the swelling method used to investigate cross linking, any advise is appreciated! Q1)
07 July 2015 7,131 7 View
Hello, I am doing XRD and the only available sample holder is a glass holder, my sample is a thin film so I am getting a huge amorphous peak from glass as well. Is there anyway I can modify the...
06 June 2015 7,971 8 View
I am attempting to study the thermal stability of a polymer sample(regenerated cellulose) before and after exposing it to radiation. I've attached the TGA graph for both. After treatment the...
04 April 2015 7,796 17 View
I have polyethyleneimene, it is in a 50% aq sol form. I have been trying to Electrospin but I dont seem to be getting any fibers, I've tried to add more water to it so as to decrease the viscosity...
04 April 2015 4,485 7 View
In the modified hummers method, the first step is to add Graphite to sulfuric acid and let it stir for some time, lit. mentions this step causes the graphite to swell... I would like some details...
03 March 2015 2,835 2 View
I need to dissolve cellulose in NMMO, lit. survey suggests that the simplest method to do is to dissolve it in NMMO, unfortunately detailed steps have not been mentioned anywhere, I have a few...
02 February 2015 883 3 View
1) What is the main reason behind GO having weak mechanical properties? 2) If GO is mechanically weak, how come some lit. report GO being used as a reinforcer to enhance mechanical properties? I...
02 February 2015 6,605 8 View
I am attempting to prepare GO paper using the vacuum filtration technique, I used a cellulose acetate membrane to filter the GO solution(1mg/ml) andwas able to get a brown film on the membrane,...
02 February 2015 3,233 4 View
Hello all, I plan on preparing a water treatment membrane in which I would like to use GO along with a suitable polymer. My question is what different techniques can be used to prepare a...
01 January 2015 6,511 4 View
I would like to know if its possible to prepare a cellulose thin film by solvent casting, preferably using water as the medium of dispersion. If yes, what is the minimum amount of cellulose...
01 January 2015 8,316 4 View
I tried to prepare GO by using the tours method, however, XRD analysis shows no presence of GO. I've attached both the method used and XRD results, would like to hear back from people who have...
12 December 2014 6,235 20 View
Hello, I am preparing GO using hummers method as follows: Briefly, 69 mL of concentrated H2SO4 was slowly added to a mixture of graphite powder (3 g, 1 wt equivalent) and NaNO3 (1.5 g, 0.5 wt...
12 December 2014 2,324 16 View
