Talk:Ultrafine particle

Would it not make sense to merge this page with Particulate?
Oderbolz (talk) 17:35, 22 March 2008 (UTC)


 * On the surface it might make sense. However, ultrafines behave very differently from the more familiar particles discussed in Particulate.  Gravity is not particularly important to their movement and they might behave more like gas than solid.  In addition, the typical methods for measuring particulates (mass concentration and the like) are clearly not useful for ultrafines, and we have yet to figure out what is useful.  So at this point I think it would be better to keep this as a separate article.


 * On the other hand, this article should either recognize a difference between Nanoparticle and Ultrafine particle (and such a difference can be articulated) or should be combined with the nanoparticle article. Pzavon (talk) 00:53, 23 March 2008 (UTC)


 * Because the health effects are sharply worse starting at PM2.5 and working down, an article covering fine particles, ultrafine particles, and nanoparticles would be welcome, separate from but referred to by, the particles article. Ocdnctx (talk) 01:44, 16 November 2011 (UTC)

EPA reassessing current PM2.5 standards in light of new research showing worse for health than though.
http://www.nytimes.com/2012/02/19/science/earth/scientists-find-new-dangers-in-tiny-but-pervasive-particles-in-air-pollution.html

Dense fine particles from cars (diesel?) the worst. EPA reassessing current PM2.5 standards.


 * "… upends previous assumptions about the fate of the byproducts of the pollution from internal-combustion engines. These gaseous byproducts were thought to incorporate themselves into tiny airborne drops of liquid that would then dissipate quickly as the drops evaporated.


 * The new study finds instead that they attach themselves more tightly to airborne organic particles, creating tiny tar balls that evaporate more slowly and persist longer than anyone had thought. ... "

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Merge into Nanoparticle article?
Nanoparticles seem to overlap lower end of Ultrafine particle size range, and are better known to and understood by, the public.

Googling, 2017 March 12 over 40 times the hits. Advantage Nanoparticles over Ultrafine particles

Nanoparticles 18,900,000 results

Ultrafine particles 450,000 results

"Particles less than 10 nm are also referred to as nanoparticles"


 * ... 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

Ocdcntx (talk) 02:47, 13 March 2017 (UTC)
 * Support They are referring to the same thing, only distinction being that ultrafine particles include particles smaller than 1 nm, however this shouldn't be much of a problem since the ultrafine particles article doesn't discuss any sub 1 nm particles. See main discussion at Talk:Nanoparticle. Trialpears (talk) 20:44, 27 April 2019 (UTC)
 * Note that the main discussion has been talking place over at Talk:Nanoparticle. As that is the target of the proposed merge, I suggest using that page. Klbrain (talk) 09:59, 27 April 2019 (UTC)

Page with nice comparison of various particle sizes, down to oxygen
http://www.engineeringtoolbox.com/particle-sizes-d_934.html (table) (rearranged by size)

e.g. (in microns) (examples)

Oxygen 	                	 	0.0005

Carbon Dioxide 	 	 	0.00065

Sugars 	                	 	0.0008 - 0.005

Typical Atmospheric Dust 	0.001 to 30

Oil Smoke 	 	 	 	0.03 - 1

Coal Flue Gas    	                0.08 - 0.2

Coal Dust 				1 - 100

Auto and Car Emission 		1 - 150

Fly Ash				 	1 - 1000