Talk:Nanocrystal

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Removed Purchase Link

I have removed the "Purchase Nanocrystals" links with one that points directly to the technology page of the same website. I have also named the link as "Nanocrystal Technology". Wikipedia articles are not promotional pieces. --Pavithran 19:18, 14 December 2006 (UTC)[reply]

Platinum nanocrystals

I'm not sure how to integrate this with the article, but it seems like a good ref: New platinum nanocrystals boost catalytic activity —Disavian (talk/contribs) 14:03, 15 May 2007 (UTC)[reply]

SolarPly and organic solar cells

This parargraph seems very much like an advertisement to me. It also contains an error; organic solar cells are still far away from reaching 9% efficiency. —Preceding unsigned comment added by Trygvetv (talk • contribs) 10:43, 28 February 2010 (UTC)[reply]

Unnecessary Information?

Is this sentence in the introduction simply unnecessary as it introduces a very complex subject?

They can behave as single-domain systems (a volume within the system having the same atomic or molecular arrangement throughout) that can help explain the behaviour of macroscopic samples of a similar material without the complicating presence of grain boundaries and other defects.[citation needed] TJ LaFave (talk) 03:02, 12 February 2014 (UTC)[reply]

Repetitious and confusing description

This sentence appeared in the introduction (before I removed it for redundancy and confusion):

"Basically,a 'nanocrystal' is a crystalline arrangement of a material that is measured on the scale of nanometres (0.000000001m) and is significant as it has different properties."

immediately following this sentence:

"A nanocrystal is a material particle having at least one dimension smaller than 100nm[1] (a nanoparticle) and composed of atoms in either a single- or poly-crystalline arrangement."[2]

The new sentence is repetitious and is a confusing description of this topic (Nanocrystals) for the following reasons:

The first sentence clearly points to two specific references (which I inherited from previous revisions) citing that "at least one dimension" is smaller than 100 nm. This is specific, because nanocrystals can in fact be quite large in other dimensions -- consider nanowires and nanosheets, for example, which may have dimensions measured in millimeters or even meters. The second citation defines the arrangement of atoms in nanocrystals. These two concepts combine to define the prefix (nano-) and root (crystal) of the topic without any ambiguity.

The newly added statement, however, obfuscates the definition since "crystalline arrangement of a material" doesn't actually have a specific meaning. In particular, what precisely is arranged in a crystalline fashion? -- the atoms in the material or multiple copies of the material? Knowing the difference requires specialized knowledge which is not appropriate for Wikipedia (it's the reason many of the pages on Wikipedia are tagged with requests to simplify the language for a general audience? Phrase also generically implies that "crystals have crystalline arrangements" -- which doesn't contribute to a definition. As well, one of many reasons why nanocrystals are "significant" is that they has different properties from all other kinds of material systems. "Significance" is arbitrary, and having different properties from other materials isn't the only way in which nanocrystals are significant. However, even this statement is ambiguous as the sentence doesn't explain with what nanocrystal properties are different.

I have removed this sentence for these reasons.

Incidentally, this new sentence's use of the word "Basically" is more colloquial than appropriate as it concedes that the sentence is easily understood or "basic" -- which it simply is not.

I have maintained the reference cited along with this unusual sentence here in this talk page. It is a very specialized paper but may be more appropriate as an example of nanocrystals (gold).

Here is the cited reference: [1] 

TJ LaFave (talk) 01:30, 19 February 2014 (UTC)[reply]

References

  1. ^ J. Xu (2008). "Hydrothermal syntheses of gold nanocrystals: From icosahedral to its truncated form". Advanced Functional Materials. 18: 277.

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