Vijay Kumar

7 Questions 20 Answers 0 Followers

Questions related from Vijay Kumar

Why the color of TMB turns blue after adding hydrogen peroxide?

I want to know the exact mechanism

30 March 2023 6,756 0 View

What is the exact mechanism behind peroxidase like mimetic activity of nanopaticles/carbon quantum dots using TMB as a substrate?

I want to clear some doubts regarding the mechanism of peroxidase-like mimetic activity of nanoparticles. I have synthesized carbon quantum dots, and it changed the color of the solution (50 mL of...

25 June 2022 3,962 0 View

Why the gold nanoparticles synthesized from leaf extract get negatively charged?

I have synthesized gold nanoparticles from aqueous leaf extract of Croton bonplandianum. The zeta potential result showed it is negatively charged. Please explain the exact reason of this...

06 June 2018 6,752 8 View

How to calculate the concentration of carbon quantum dots ?

I have prepared carbon quantum dots by taking 200 mg precursor in 200 mL distilled water. Its very tough to precipitate the carbon quantum dots by centrifugation. It is in solution form. How can I...

08 January 2018 800 4 View

Which standard additional technique should be applied for the determination of Iron (III) in terms of validation?

The colorimetric detection of Iron (III) was carried out using AgNPs synthesized by plant extract. Different concentrations of Iron (III) were added into 1 mL solution of AgNPs and the change in...

08 September 2016 1,430 4 View

What differences could be seen in pre and post annealed nanoparticles when characterized through XRD ?

I have synthesized the AgNPs using plant extract and annealed it at 300 degree Celsius. The pre annealed sample was also characterized by XRDNow what differences could be seen?

26 June 2016 661 15 View

What is the reason behind the formation of anisotropic nanoparticles like triangular, hexagonal, rod etc. in the same reaction volume?

I have performed the green synthesis of AuNPs using aqueous leaf extract. It was noticed that by using same amount of leaf extract the different metal ion produced mixture of different shaped and...

01 January 1970 1,264 2 View