"Nanotechnology" isa broad term that includes aspects of materials
science, mesoscopicphysics, organicandinorganicchemistry, na-
electronics, atmosphericchemistry, airpollution, and other?elds.
The technology is very muchincurrent focus-at the beginning of the
Third Millennium-and raises hopes for environmentally benign,
resource-lean manufacturing of products of manykinds. One precursor
to present-day nanotechnology used porous coatings, comprised of
"ultra?ne" particles withdimensions inthe nanometer range, for
absorption of thermal radiation on thermocouples, bolometers, and
the like. These particles were prepared by gas-phase syntheses,
speci?cally using species formed by nucleation andgrowth from a
metalvapor - dergoing coolingby collisions withinert gas molecules.
Such "inert gas evaporation" was explored inthe 1920s and 1930s
see, for example, A.H. Pfund, Phys. Rev. 35 (1930) 1434]andwas
investigated in moredetail in the 1960s and 1970s see, for example,
K. Kimoto et al., Jpn. J. Appl. Phys. 2 (1963) 702; C.G. Granqvist
and R.A. Buhrman, J. Appl. Phys.47 (1976) 2200]. Improved
analytical capabilities(electron microscopy)as well as new
applications (selective absorption of solar energy) were twoofthe
r- sons for the renewed interest. Today, gas-phase synthesis of
nanoparticles constitutesthe foundation for a pro?table butstill
small industry. Aerosols, i.e., dispersions or suspensions of
particles ina gas, form the background ?eld for contemporaryefforts
in gas-phase nanotechnology. Interest inaerosol
researchhistorically arose from the issues of atmospheric chemistry
and physics, human health protection, and airpollution. Today,
aerosol researchengagesa vast array of efforts inthese and related
?elds, andelsewherein work identi?ed as nanotechnology.
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