Ahmed Elsheikh

6 Questions 16 Answers 0 Followers

Questions related from Ahmed Elsheikh

Is there a solid and rigorous analysis for intermetallic overlapping XRD peaks versus alloy formation?

In the course of preparing bimetallic and trimetallic nanoparticles, there are three outcomes in terms of the XRD patterns: 1. They present single peaks that are intermediate between the peaks of...

10 July 2021 9,433 4 View

Could someone help with interpreting Ag XRD peaks?

Dear All, I have prepared trimetallic PdAgNi nanoparticles supported on carbon in addition to their monometallic Pd/C and Ag/C counterparts. I am having some issues with the XRD pattern with the...

24 December 2020 8,148 3 View

What is a good TEM magnification to enable accurate small-size nanoparticle calculation?

Dear Fellows, I synthesize intermetallic nanoparticles by chemical reduction and disperse them on carbon support. The TEM equipment I use is unable to highly magnify above 40kx. Beyond that the...

24 September 2020 8,999 8 View

How to improve the SEM graph quality obtained by basic teaching SEM equipment?

Dear All, Could you please help me with improving the quality of my SEM images? An example image is attached. It has obtained by a basic Jeol SEM microscope with a tungsten filament. I have tried...

02 August 2020 9,985 6 View

Please, could someone explain the ORR mechanism to me?

Dear All, I prepare trimetallic Pd-based catalysts supported on carbon and apply them as electrocatalysts for ethanol electrooxidation which is my main target. Yet, an idea occurred to me that...

20 March 2019 7,355 3 View

Is it worthy to still publish “negative” results?

Dear All, As researchers, we always make some hypotheses to resolve some problem based on reviewing the relevant literature. For example, someone could prepare two materials (A and B) and...

01 January 1970 1,424 6 View