Talk:Nanoparticle

Issues of Clarity
This is one phrase (below) that does not clearly state what the properties of nanoparticles are. Since I don't know how to edit it I Will leave it will this message, but I think something could be done to clarify. "The interesting and sometimes unexpected properties of nanoparticles are not partly due to the aspects of the surface of the material dominating the properties in lieu of the bulk properties."

Cullen kasunic 01:08, 16 October 2007 (UTC)

You talk about all aspects of characterization but it is not defined, actually. Charles Michael Collins October 17, 2007 5:34 (EST). —Preceding unsigned comment added by 71.114.36.203 (talk)

Silicon Nanopowder
Is this image magnified? If so, how much (and should it be put in the article)?


 * Try clicking through the image in question for metadata information which may be relevant to your inquiry.
 * Also, please consider concluding your comments with a signature. Entering four consecutive tildes ( ~ ) will automatically append a signature to your comments. Folajimi 11:48, 2 March 2006 (UTC)

nanoparticle
How safe are nanoparticles? What side effects are there to using them?

This reference on the Safety of Nanoparticles helps answer those questions: http://www.springerlink.com/content/978-0-387-78607-0 G2kdoe (talk) 12:49, 1 April 2009 (UTC)

Merging nanoparticles and nanopowder
I, the author of the nanopowder article, support this merger. Iepeulas 04:00, 30 November 2006 (UTC)

Merge

In the human body
Can a section be added about the possibility of nanoparticles' entering of the human body (and the possibility of crossing the blood-brain barrier and entering into the brain? Badagnani (talk) 15:40, 28 May 2008 (UTC)

Amorphous/nanoparticle Si
What is Amorphous/nanoparticle Si ? --Mac (talk) 07:24, 25 June 2008 (UTC)
 * See also Nanocrystalline silicon. Neither seem to be nanoparticles. - Rod57 (talk) 08:38, 1 July 2011 (UTC)

split out medical
Content on medical/injectable nanoparticles probably worth splitting out into separate article or move & refer to nanomedicine ? - Rod57 (talk) 11:07, 1 July 2011 (UTC)

single material and composite nanoparticles
Should we organise this article to separate single-material nanoparticles from complex/composite nanoparticles (eg re fabrication) ? - Rod57 (talk) 11:06, 1 July 2011 (UTC)

Novel/original interpretation of referenced research
In the section on safety the following claim appears 'Diesel nanoparticles have been found to damage the cardiovascular system in a mouse model.', yet upon reviewing the linked reference, the word 'diesel'(or any specific alternate) is not used even once. Perhaps someone thought it reasonable to assume that all nano-particulate pollution on LA freeways is strictly the result of diesel fueled vehicles. I don't think that is the case, but even if it were, the substance probably shouldn't be called 'diesel nanoparticles'. Nanoparticles are generally solids. 'Diesel' at STP describes a liquid. If the article had been more specific about diesel fueled vehicles being mostly, or even partially responsible for the nano-particle pollution, then it might be reasonable to describe it as something like 'nano-particle pollution resulting from diesel combustions', but the article did not say anything like that. Please change the text to read something that is actually supported by the linked reference, find a more supportive reference to link, or simply drop the unsupported claim. 70.171.36.245 (talk) 17:52, 20 March 2014 (UTC)BGriffin
 * The link is now dead (404). If no one has any objections, I'm going to remove that sentence. Zyxwv99 (talk) 16:48, 12 June 2016 (UTC)

Old essay in userspace
User:Akhil9gupta/NANOPARTICLE AND ITS APPLICATION: - THE REVIEW was created in 2009 about nanoparticles and while it's largely not useful, it has some sources and text that could be useful here. Could someone take a look or else take it to MFD and put it away after all these years? -- Ricky81682 (talk) 09:58, 20 March 2016 (UTC)

Merge Ultrafine particle article into this article?
This article states:
 * ... particles are the same as nanoparticles and between 1 and 100 nanometers in size...

If they are the same, it is a reason for merging the articles.

It appears that nanoparticles are the same as ultrafine particles, or overlap the entire Ultrafine particle size range, or alternately overlap most of it. The term "nanoparticle" is much better known to and understood by, the public than the term "ultrafine particle," by a factor of 40-to-1.

A comparison of Google hits in 2017, March 12, found that a search for nanoparticles returned over 40 times the hits as a search for ultrafine particles.

Nanoparticles  18,900,000 results

Ultrafine particles 450,000 results

On 2017 Sept 18,

Submicrometer returns 1,760,000 results

Ergo, 97.5% of those writing on the web seem to be discussing particles in this size range as nanoparticles, and not as ultrafine particles

It would be useful to discuss both in a single article to clarify confusion. The overwhelming bulk of the article would be common characteristics, as nanoparticles, overlap much or all of the size range of ultrafine particles, and visa-versa. If there are certain useful distinctions in chemical properties, as some sources suggest, those could be pointed out.


 * ...nanoparticle, n—in nanotechnology, a sub-classification of ultrafine particle with lengths in two or three dimensions greater than 0.001 micrometer (1 nanometer) and smaller than about 0.1 micrometer (100 nanometers) and which may or may not exhibit a size-related intensive property.


 * DISCUSSION—This term is a subject of controversy regarding the size range and the presence of a size-related property. Current usage emphasizes size and not properties in the definition. The length scale may be a hydrodynamic diameter or a geometric length appropriate to the intended use of the nanoparticle.

http://www.horiba.com/scientific/products/particle-characterization/applications/what-is-a-nanoparticle/

The next source distinguishes based on size. Particles less than 10 nm are referred to as nanoparticles, those between 10 nm and 100 nm as ultrafine. This unusual size distinction may drive its conclusion that ultrafine and nano-particles have different chemical characteristics.


 * ... particle data were classified to ultrafine particles (number concentration with size between 10 nm and 100 nm, NC0.01–0.1) and nano particles (number concentrations with size between 10 nm and 50 nm, NC0.01–0.05).

http://journals.lww.com/epidem/Fulltext/2006/11001/Comparison_of_Ultrafine_and_Nanoparticles_in.404.aspx


 * ... Ultrafine particles are airborne particulates of less than 100 nm in aerodynamic diameter. Examples of ultrafine particles are diesel exhaust particles, products of cooking, heating and wood burning in indoor environments, and more recently, products generated through the use of nanotechnology.

...
 * ... Although there are many differences in the physico-chemical composition of UFPs and nanoparticles, one common feature is their extremely small size; this allows these particles to have unique characteristics that can cause harmful health effects to human subjects (Box 1 and Table II).1

The size distinctions in this next source may be an outlier opinion that does not reflect the mainstream views presented in the relevant Wikipedia articles or in the majority of sources.

Another term that should be referenced is "submicrometer", e.g.,


 * Personal exposure to submicrometer particles and heart rate variability in human subjects.

(Environ Health Perspect. 2004 Jul;112(10):1063-7.) https://www.ncbi.nlm.nih.gov/pubmed/15238278

Ocdcntx (talk) 02:49, 13 March 2017 (UTC)


 * I was thinking about merging the two myself, given that they're usually given the same definition, but I've been holding off until I have time to do a literature search to get sources. My impression is that the terms are used to mean the same thing in different contexts: "ultrafine" for environmental monitoring of aerosols and for commodity materials, and "nanoparticle" for particles engineered for specialty uses.  John P. Sadowski (NIOSH) (talk) 00:31, 21 September 2017 (UTC)
 * I agree that the 'Ultrafine particle' article seems to be about nanoparticles as air pollution. It's a different concept than the general description of nanoparticles in science; I don't think it should be merged to nanoparticle.  It could however be made clearer what "ultrafine particle" is about by retitling, changing that first sentence, or even merging into something like Particulates.Cyrej (talk) 15:36, 26 January 2018 (UTC)

I would agree that merging the two articles is a very good idea. The division between nanoparticles and ultrafine particles is mainly historical. From the viewpoint of physics there is no difference between them whatsoever. Of course as the user above states there is still a historical difference between using these terms from field to field. However given the contents of both articles in question I would support merging them as they are really talking about the same thing and the nuances in terminology can be explained in a subsection of the merged article. — Preceding unsigned comment added by 147.231.113.103 (talk) 09:28, 13 April 2018 (UTC)
 * Oppose merge. The Ultrafine particle article is all about the health/pollution effects, and is hence better thought of as PM0.1, part of a series with PM10 and PM2.5, both of which redirect to Particulates. My view is therefore that the current contents would fit better at Particulates. Alternatives include Health and safety hazards of nanomaterials and Nanotoxicology. Klbrain (talk) 10:20, 27 April 2019 (UTC)


 * Weak oppose Both articles are appropriately structured and with a quite well defined subject areas; ultrafine particle refer to these particles as air pollutants and nanoparticle refer to most other aspects of them. However the navigational situation is complicated with the current "Health and safety" section linking to three different relevant articles with ultrafine particles probably belonging up there as well. This many articles so closely linked is clearly suboptimal, but this merge is probably not the answer. Kilbrain's suggestion of merging to Particulates could work, but other mergers are probably necessary as well to clean up the larger situation, such as merging Pollution from nanomaterials into an appropriate target. Trialpears (talk) 21:08, 27 April 2019 (UTC)


 * Oppose. Since the initial merge proposal in 2017 both articles have gown substantially, and it is now clear that they are referencing two different things. ElectroChip123 (talk) 00:35, 4 May 2019 (UTC)
 * Just for reference. Google (as of 2019) returns ~7,030,000 results for ultrafine particle and ~41,500,000 for nanoparticle. — Preceding unsigned comment added by ElectroChip123 (talk • contribs)

Nanoparticles in nature
There are occurrences of nanoparticles in nature. They can be found in magmas, in rocks (for example "invisible gold"), on tectonic faults, etc. Will adding a short section about that be appropriate? — Preceding unsigned comment added by 87.69.94.236 (talk) 09:25, 16 March 2018 (UTC)

Definition of colloid is incorrect
The article says, "A colloid is a mixture which has solid particles dispersed in a liquid medium."

This simply is not true. A mixture which has solid particles dispersed in a liquid medium is an example of a colloid (if the size etc criteria are met). A colloid is simply one or more discontinuous phases of matter dispersed in a continuous phase of matter and that meets rather arbitrary size critera. Neither particles or liquids are a requirement. The incorrect definition in the article highlights the utter confusion that has arisen since "nano" has become the cash cow for R&D and the underpinning colloid science for nanodispersions etc has been usurped, misunderstood, reinvented and generally forgotten. 75.165.230.214 (talk) 15:34, 14 November 2018 (UTC)
 * I made a correction along these lines. Sarah at PMI (talk) 14:36, 24 July 2020 (UTC)

Muslims were not allowed to use gold?
The History section included the passage


 * As Muslims were not allowed to use gold in artistic representations, they sought a way to create a similar effect without using real gold. The solution they found was using luster.

I cannot access the reference, but even if it contains the claim "Muslims were not allowed to use gold in artistic representations", I wonder whether that claim is true. --Jorge Stolfi (talk) 09:26, 29 February 2020 (UTC)

Wiki Education assignment: Toxicology
— Assignment last updated by Mariserge529 (talk) 18:11, 28 September 2022 (UTC)