User talk:Mudarahmed

Lattice constant vs. particle size
can go either way, there are too many effects involved (surface tension, strain, etc), and theory is no reference here, see .. , e.g.. Materialscientist (talk) 01:56, 13 March 2011 (UTC)
 * Nanosized effects occur at such particle size that there is no clear distinction between core and surface. You probably speak about deconvolution of the contributions, which is possible in theory, but usually not in experiment. With all due respect, theory is a weak guide here. Materialscientist (talk) 05:25, 13 March 2011 (UTC)

I finally got to read your articles, and have reverted your additions at Potential well and Lattice constant, because they do not comply with some basic wikipedia policies, namely From the science point of view - this is merely a theory which needs ample experimental support. Regards. Materialscientist (talk) 01:55, 15 March 2011 (UTC)
 * WP:COI - it is very difficult to objectively evaluate your own work.
 * WP:PRIMARY - those results are published in minor journals with impact factor of about 1.2. They are not yet evaluated by the community (the only citations are self-citations).
 * Phys Rev is by all means a respectable journal, yet the above concerns on COI, primary sources and lack of experimental support remain. Theory has relatively low weight in this area of materials science. Materialscientist (talk) 05:12, 15 March 2011 (UTC)
 * Further, please avoid speculating on my area of expertise. I would be glad to discuss the scientific part of it separately. Back to your point on surface relaxation withing a few atomic layers - it is an old an common assumption of most calculations. Experimentally, it is very difficult to separate the constituting effects (sample preparation, strain, chemistry, etc. concerns). Materialscientist (talk) 05:15, 15 March 2011 (UTC)

Your first experimental reference is incomplete and I don't seem to have access to Olga A. Shenderova, Dieter M. Gruen, Ultrananocrystalline Diamond: Synthesis, Properties, and Applications, 1st edition, William Andrew Inc., 2006, but I have done much spectroscopy and TEM lattice imaging of nanodiamond first-hand and can answer direct questions. In general, these are very difficult experiments with lots of artifacts (very few studies were performed on clean nanodiamond, 99.99% had severely contaminated surface, despite the assertions). It is relatively straightforward to prepare and image clean bulk surface and its reconstruction from the top (e.g. by STM), but cross-sectioning (especially of nanoparticles) is problematic. Note that the vast majority of individual nanodiamonds are not single crystals but contain twins and other defects extending through most of the particle. PS. You can reply here, I am watching this page. Materialscientist (talk) 07:04, 15 March 2011 (UTC)
 * The article you linked admits that the difference in the lattice constant likely originates from "high-density defects and other impurity atoms". I don't know how did they measure/observe those defects, but this agrees with other observations, including mine. Diamond is a bad example of nanosized effects, because nanodiamond is too defective and impure. This is why all classical experiments were done on noble metals and perhaps on some II-VI semiconductors (e.g. CdS). Materialscientist (talk) 10:24, 15 March 2011 (UTC)

On - I will check the full text tomorrow, but what I read from the abstract is they observed 4 other crystalline phases. This is not the same as a continuous increase of lattice constant in one phase. Materialscientist (talk) 11:33, 15 March 2011 (UTC)

Your recent edits
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Your submission at Articles for creation: Wurtzoids (December 23)
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/wia 🎄 /tlk 17:09, 23 December 2015 (UTC)

Your submission at Articles for creation: Wurtzoids (December 25)
 Your recent article submission to Articles for Creation has been reviewed! Unfortunately, it has not been accepted at this time. The reason left by LaMona was:

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LaMona (talk) 01:54, 25 December 2015 (UTC)

Draft:Wurtzoids concern
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Your submission at Articles for creation: Wurtzoids (June 23)
 Your recent article submission to Articles for Creation has been reviewed! Unfortunately, it has not been accepted at this time. The reason left by MorbidEntree was:

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MorbidEntree-(Talk to me! (っ◕‿◕)っ♥) (Contribs) (please reply using ,(unless this is on my own talk page) otherwise I may not see your reply) 10:14, 23 June 2016 (UTC)

Speedy deletion nomination of Draft:Wurtzoids


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