Vijay Kumar

14 Questions 44 Answers 0 Followers

Questions related from Vijay Kumar

What happens when silver nanoparticles (Aggregate of Ag0) are released into the environment? Can it be change into the Ag3+ or remain as same (Ag0)?

I have synthesized silver nanoparticles form green route. While washing the glassware, the nanoparticle are released which must be entering into the environment. I want to know that is there any...

01 January 2019 1,998 14 View

What are the components of a sensor? How it works?

Hello, This is Dr. Vijay, I am want to design a sensor for different heavy metal ions. I want to know the basic idea behind it. Thank you.

12 December 2018 5,016 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 4,299 9 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...

01 January 2018 3,755 4 View

How can I calculate the concentration of gold nanoparticles in suspension ?

Hello all,I have synthesized the AuNPs using 1.2 mM auric chloride salt. How can I know its concentration in suspension form?

07 July 2017 3,938 5 View

Why the size and anisotropic nature of the green synthesized AuNPs increased with the increase in metal ion concentration?

The green synthesis of gold nanoparticles was investigated using different metal ion concentration at a fixed inoculum dose and reaction incubation time. It was observed that the size of the...

12 December 2016 884 8 View

What should I write in discussion about the 2D, 3D and average roughness profile of nanoparticles?

I have synthesized AgNPs with average size 14 nm and characterized it through AFM analysis. I have got the 2D, 3D images and roughness profile. The average roughness of the sample was found to be...

10 October 2016 8,269 2 View

Why the peak of rGO did not appear in the XRD spectra of Ag-rGO-PANI?

The composite of Ag-rGO-PANI was prepared and characterized through XRD technique. When the XRD spectra of rGO and PANI were taken separately, a characteristic band appeared but these did not...

09 September 2016 7,345 7 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...

09 September 2016 6,694 5 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?

06 June 2016 3,501 16 View

Why hydrogen peroxide get decomposed into H2O and O2 at higher pH rather OH radical? and why it decomposed into two OH radical at lower pH?

I am investigating the peroxidase like activity of green synthesized gold nanoparticles. While optimizing the pH it was observed that the peroxidase like activity of the gold nanoparticles was...

01 January 1970 9,620 0 View

Why the value of d-spacing of AuNPs increased on increasing the size of the AuNPs which were obtained by increasing metal ion concentration?

I have synthesized AuNPs using different HAuCl3.xH2O (0.4 mM, 0.8 mM, 1.2 mM, 1.6 mM, 2.0 mM, 2.4 mM, 2.8 mM, and 3.2 mM) of different sizes.It was observed that when the concentration of...

01 January 1970 2,142 5 View

What is the concept behind the formation of spherical, triangular, hexagonal rod shaped AuNPs?

Hello alI..!I have synthesized gold nanoparticles using leaf extract and observed the formation of different shaped gold nanoparticles. I want to know the exact reason for the formation of such...

01 January 1970 2,186 6 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 295 2 View