16 Questions 22 Answers 0 Followers
Questions related from Mehrdad Taheran
I have FeCl2 crystals and I want to produce FeSO4.7H2O based on the reaction below: FeCl2 + H2SO4 = FeSO4 + HCl I dissolved the FeCl2 crystal in water, added equivalent amount of H2SO4 to react...
22 March 2024 1,201 0 View
I need to simulate the effect of natural organic matters (NOMs) on the performance of new technologies for tertiary treatment stage of wastewater treatment plants. Therefore I need the...
08 October 2017 6,969 3 View
I am using a rotary drum collector(diameter:10 cm and length:25 cm) to produce PAN nanofibers (Needle Gauge:22 and needle to center of collector distance: 16 cm). The problem is that in most...
18 April 2016 6,827 7 View
As I know the enzymatic degradation reactions are initially zero order and then turn into first order that means the degradation increase by time without any decrease. However I saw that many...
29 March 2016 3,803 3 View
I fabricated a coaxial needle with gauge 22 and gauge 16 and tried to make hollow nanofibers from PAN solution in DMac (10%) using mineral oil as sheath fluid. However, when I manipulated the...
22 March 2016 5,506 3 View
I know that electrospinning of chitosan is difficult due to high viscosity and surface tension of typical acetic acid solution. According to one paper, I reacted chitosan with methansulfonic acid,...
13 January 2016 3,049 10 View
I need something to vibrate with the frequency of 20-200 KHz and the amplitude of several micrometers. As I heard, piezo transducers are suitable but I do not how to find and how to assemble?...
26 December 2015 217 5 View
I want to produce electrospum fibers from PAN/Chitosan composite. The problem is that PAN is soluble in organic solvents like DMF but chitosan is not. I know that chitosan should be modified to be...
01 December 2015 7,878 3 View
I have two XRD pattern of biochar. one before activation (BC-M) and the other after activation (AC-M). Now I need help for interpretation. As I know, the structure of biochar before activation is...
29 November 2015 6,748 7 View
Does anybody know where I can buy affordable coaxial needles for electrospinning of PAN?
26 November 2015 8,974 4 View
I wonder if its possible to use the bearing balls in ball milling system. The material for grinding is charcoal and there is no problem with the hardness. But I want to know if there is any other...
18 October 2015 550 5 View
I am studying the complexation of tetracycline with metals through potentiometric titration of tetracycline with metal solution. The goal is the determination of stability constant: M + n(TC)=...
11 September 2015 4,061 8 View
I am working with 10% PAN/DMF solution for making nanofibers. The problem is that the fibers are formed in the air gap before reaching the collector and after sometime the cone will be...
02 September 2015 4,267 14 View
We produced the crude enzyme solution from white-rot fungi grown on apple waste. We did not do any purification and therefore the compounds in apple wastes are present in the solution. The target...
08 August 2015 5,755 11 View
I reacted ABTS with potassium persulfate. Within 10 min, I saw an increase in absorbance at 420 nm and after that it started to come back to baseline. I read somewhere that it is stable at least...
01 August 2015 5,714 9 View
I am studying the activities of Laccase enzyme in crude extract of P. chrospordium fungi Using ABTS. I cannot observe change in absorbance at 420nm or other wavelength. I used different protocols...
29 July 2015 7,335 6 View
