nanoquebec 2007-03-07 06:35
今日纳米杂志(nanotoday, 2007V2N1): 热点文章
[size=3][color=DarkGreen][url=http://www.sciencedirect.com/science?_ob=PublicationURL&_cdi=33024&_pubType=J&_auth=y&_acct=C000056154&_version=1&_urlVersion=0&_userid=2101137&md5=29d3bdc3e48675e3b829708b4dda1374&jchunk=2&view=f][img]http://img66.imageshack.us/img66/5764/febofc1924e3ef8.jpg[/img][/url]
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[b]Cover story: Thermometer design at the nanoscale[/b][/size]
By Jaebeom Lee and Nicholas A. Kotov
Accurate temperature measurement with high spatial resolution is a challenging research topic. Advances in nano- and biotechnology demand precise thermometry down to the nanoscale regime, where conventional methods are not able to make measurements. The development of a nanoscale thermometer is not only a matter of size, but also requires materials with novel physical properties, because all physicochemical and thermodynamic properties are drastically altered at this tiny scale. We review current technical developments toward nanoscale thermometries and describe their advantages and applications. In particular, progress on thermal sensors using molecular and biological moieties, as well as nanoscale superstructures, is stressed as a novel approach to thermometry.
:hand [url=http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B82X8-4N13BB2-N-5&_cdi=33024&_user=2101137&_orig=browse&_coverDate=02%2F28%2F2007&_sk=999979998&view=c&wchp=dGLbVlb-zSkWz&md5=a454b10ac5e04a51b4eea2764a90efe6&ie=/sdarticle.pdf]:fulltext[/url]
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[img]http://img66.imageshack.us/img66/1980/febreview011ffebcdm8.png[/img][size=4][b]Au nanoparticles target cancer (review) :good[/b][/size]
By Prashant K. Jain, Ivan H. ElSayed and Mostafa A. El-Sayed
Nanoparticles with unique optical properties, facile surface chemistry, and appropriate size scale are generating much enthusiasm in molecular biology and medicine. Noble metal, especially Au, nanoparticles have immense potential for cancer diagnosis and therapy on account of their surface plasmon resonance (SPR) enhanced light scattering and absorption. Conjugation of Au nanoparticles to ligands specifically targeted to biomarkers on cancer cells allows molecular-specific imaging and detection of cancer. Additionally, Au nanoparticles efficiently convert the strongly absorbed light into localized heat, which can be exploited for the selective laser photothermal therapy of cancer. We discuss recent advances in the study and use of selectively targeted Au nanospheres in cancer photodiagnostics and photothermal therapy. By changing the shape or composition of Au nanoparticles, the SPR can be tuned to the near-infrared region, allowing in vivo imaging and photothermal therapy of cancer. The use of Au nanorods and silica-Au core-shell nanoparticles for in vivo cancer detection and therapy is discussed.
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:hand [url=http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B82X8-4N13BB2-J-W&_cdi=33024&_user=2101137&_orig=browse&_coverDate=02%2F28%2F2007&_sk=999979998&view=c&wchp=dGLbVlb-zSkWz&md5=93e5fd3864f34145d8ec02f0a56fe1a6&ie=/sdarticle.pdf]:fulltext[/url]
[img]http://img66.imageshack.us/img66/3559/febreview022325cddz1.png[/img][size=4][b]Generating heat with metal nanoparticles (review)[/b][/size]
Alexander O. Govorov and Hugh H. Richardson
We describe recent studies on photothermal effects using colloidal nanoparticles. Metal nanoparticles efficiently generate heat in the presence of electromagnetic radiation. This process becomes strongly enhanced under plasmon resonance and also depends on the shape and organization of the nanoparticles. In particular, the amount of generated heat and temperature increase depends on the number of nanoparticles in a complex. Metal nanoparticles may induce phase transformations when they are in thermal contact with a polymer or a solid matrix, such as ice. This suggests new possibilities for measuring heat release at the nanoscale.
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:hand [url=http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B82X8-4N13BB2-K-13&_cdi=33024&_user=2101137&_orig=browse&_coverDate=02%2F28%2F2007&_sk=999979998&view=c&wchp=dGLbVlb-zSkWz&md5=db4a002fe95e874213ab595b6431232a&ie=/sdarticle.pdf]:fulltext[/url]
[img]http://img66.imageshack.us/img66/4400/febreview03247168av7.png[/img][size=4][b]Nanostructuring expands thermal limits (review)[/b][/size]
Woochul Kim, Robert Wang and Arun Majumdar
Scientists and engineers can exploit nanostructures to manipulate thermal transport in solids. This is possible because the dominant heat carriers in nonmetals – crystal vibrations (or phonons) – have characteristic lengths in the nanometer range. We review research where this approach is used and propose future research directions. For instance, concepts such as phonon filtering, correlated scattering, and waveguiding could expand the extremes of thermal transport in both the insulating and conducting limits. This will have major implications on energy conservation and conversion, information technology, and thermal management systems.
[url=http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B82X8-4N13BB2-M-N&_cdi=33024&_user=2101137&_orig=browse&_coverDate=02%2F28%2F2007&_sk=999979998&view=c&wchp=dGLbVlb-zSkWz&md5=8e17194b3de8f33995e0ab0f570c1ede&ie=/sdarticle.pdf]:ftext[/url]
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[[i] 本帖最后由 nanoquebec 于 2007-03-06 17:47 编辑 [/i]]