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Questions related from Ahmed Elsheikh
Dear All, I have some some confusing XRD patterns of Ni/C and Cu/C nanoparticles that I struggle to match with the known XRD cards or published patterns. I have some thoughts and questions that...
06 March 2025 7,471 5 View
Dear All, I would like to ask about the best way to digest NiFe/C powdered samples by acid for atomic absorption spectroscopy? Is HNO3 or HCL alone sufficient? Or is it better to mix them and...
24 April 2024 5,217 0 View
Hello, What are the the best methods (in terms of time and complexity) to exfoliate graphite to synthesize graphene? I have tried to do it using DMF as a solvent aplplying sonication followed by...
10 October 2023 3,803 3 View
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 9,565 4 View
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 8,366 3 View
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 9,097 8 View
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 10,072 6 View
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 7,437 3 View
Dear all, I am performing a potentiostaic EIS in a 3-electrode system in which the electrolyte is 1M KOH + EtOH and the WE, CE, and REF are Pd thin film on GC, Pt wire, and Ag/AgCl respectively....
06 March 2019 5,382 4 View
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 1,489 6 View
I use a commercial Vulcan carbon as a support for multimetallic nanparticle catalyst. I notice in the EDS spectrum a peak of Si and another of S. I tend to think these are impurities in the carbon...
01 January 1970 9,349 1 View
