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Recent News and Articles on the Keywords: gold nanoparticles + nano particles + nanoparticles  Related to the article below (Last Update: 8/5/2008)

Intriguing structures of gold nanoparticles
innovations report (Pressemitteilungen), Germany -
Scientists from Germany, Canada and the Netherlands have studied tiny gold nanoparticles, so-called clusters, and found them to have fascinating ...
It's a small, small world
Minneapolis Star Tribune, MN -
"They're really very super small particles," explained Taton, a chemistry professor at the University of Minnesota who specializes in nanoparticles. ...
Nano Sculptures In Gold
Science Daily (press release) - Aug 1, 2008
The researchers ingeniously combined an infrared spectrometer and a mass spectrometer to show the structures of uncharged gold nano particles for the first ...

Photonics.com
Priceless Nanojewels
Photonics.com, MA - Aug 1, 2008
However, adding gold nanoparticles to silica nanoparticles can yield blue colored particles (not shown), while adding gold to latex gives colors ranging ...
Using Magenetic Nanoparticles To Combat Cancer
Science Daily (press release) - Jul 16, 2008
In addition to testing magnetic nanoparticles, the research team is collaborating with other groups at Georgia Tech to determine how peptide-directed gold ...
Australian scientists find invisible gold
Hindu, India - Jul 9, 2008
However high magnification imaging showed the band was in fact, a mass of gold nanoparticles and nanoplates. ?These are identical to those being ...
Insightful Light: Raman spectroscopy may offer doctors, dentists ...
Science News - Jul 18, 2008
The key, the scientists discovered, is in using nanoparticles. By wrapping cancer antibodies around gold nanoparticles, the team used Raman spectroscopy to ...
Nanoparticles detect telomerase activity
Nanowerk LLC, HI - Jul 9, 2008
The assay system consists of gold nanoparticles coated with short stretches of DNA that can serve as a substrate for telomerase. When a sample containing ...
Cancer Drug Delivery Time Cut From Days To Hours With New Technique
Science Daily (press release) - Jul 22, 2008
The system uses gold nanoparticle vectors to deliver photodynamic therapy (PDT) drugs through the bloodstream to cancerous sites. "Gold nanoparticles are ...
Principles Behind Stability And Electronic Properties Of Gold ...
Science Daily (press release) - Jul 14, 2008
"While gold nanoparticles are being used by so many researchers -- chemists, materials scientists and biomedical engineers -- no one understood their ...
Source: Google News

[PDF] Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and … -
MC Daniel, D Astruc - Chem. Rev, 2004 - cnmt.kist.re.kr
... occur between a tip and a nanoparticle, causing the ... only if C is very small, ie,
for nanoparticles since they ... 12 M? for self-assembled monolayers on gold (1,1 ...
-

[PDF] Size and temperature dependence of the plasmon absorption of colloidal gold nanoparticles -
S Link, MA El-Sayed - J. Phys. Chem. B, 1999 - muri.lci.kent.edu
... 1 - 13 Metal nanoparticles have mainly been studied because ... 5 - 12 Nanoparticle
colloidal solutions of the noble metals copper, silver, and gold show a ...
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A DNA-based method for rationally assembling nanoparticles into macroscopic materials -
CA Mirkin, RL Letsinger, RC Mucic, JJ Storhoff - Nature, 1996 - nature.com
... composition, size and polydis-persity 1,2 of colloidal particles, and many ... Here we
describe a method for assembling colloidal gold nanoparticles rationally and ...

Shape-Controlled Synthesis of Gold and Silver Nanoparticles -
Y Sun, Y Xia - Science, 2002 - sciencemag.org
... high symmetry of this polyhedral hollow nanoparticle. ... These silver and gold
nanoparticles should find use in ... chemical synthesis of metal nanoparticles with well ...

Synthesis of thiol-derivatised gold nanoparticles in a two-phase Liquid?Liquid system -
M Brust, M Walker, D Bethell, DJ Schiffrin, R … - Journal of the Chemical Society, Chemical Communications, 1994 - rsc.org
... The IR spectra of the particles and of dodecanethiol are similar (Fig. ... The oxidation
state of gold in the nanoparticles was deter- mined by X-ray ...

[PDF] One-pot colorimetric differentiation of polynucleotides with single base imperfections using gold … -
JJ Storhoff, R Elghanian, RC Mucic, CA Mirkin, RL … - J. Am. Chem. Soc, 1998 - homepages.wmich.edu
... range, which indicates that these nanoparticle solutions are ... 13 nm diameter Au
nanoparticles in 1 ... of ~13 nm diameter gold nanoparticles functionalized with 5 ...
-

… of Polynucleotides Based on the Distance-Dependent Optical Properties of Gold Nanoparticles -
R Elghanian, JJ Storhoff, RC Mucic, RL Letsinger, … - Science, 1997 - sciencemag.org
... Nanoparticle aggregates with interparticle distances substantially ... for organizing
nanoparticles into aggregate ... studied theoretically (8). Gold particles ~13 nm ...

[CITATION] … of polynucleotides based on the distance-dependent optical properties of gold nanoparticles.,"
R Elghanian - Science, 1997

[PDF] Alloy formation of gold-silver nanoparticles and the dependence of the plasmon absorption on their … -
S Link, ZL Wang, MA El-Sayed - J. Phys. Chem. B, 1999 - nanoscience.gatech.edu
... The extinction coefficient per nanoparticle is shown on the ... 166 nm 2 for 20 nm
nanoparticles which is ... cm - 1 per atom for the gold nanoparticles is, furthermore ...
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Optical properties of two interacting gold nanoparticles -
W Rechberger, A Hohenau, A Leitner, JR Krenn, B … - Optics Communications, 2003 - Elsevier
... The distance between two successive nanoparticle rows is ... the evaporation assisted
deposition of gold and a ... can be covered by nanoparticles the spectroscopic ...

Source: Google Scholar
 
 

Gold Nanoparticles Prove To Be Hot Stuff

 
 
Gold nanoparticles are highly efficient and sensitive "handles" for biological molecules being manipulated and tracked by lasers, but they also can heat up fast--by tens of degrees in just a few nanoseconds--which could either damage the molecules or help study them, according to scientists at JILA, a joint institute of the National Institute of Standards and Technology (NIST) and University of Colorado at Boulder.

Biophysicists often study nanoscale and even picoscale mechanics by using lasers to both apply force to and track the position of fragile biomolecules such as DNA or protein by manipulating a tiny sphere--typically polystyrene--attached to the molecule. The JILA team would like to find new microsphere materials that can be trapped by laser radiation pressure more efficiently, which would enable faster measurements and detection of smaller motions at the same laser power. As described in the Aug. 15 issue of Optics Letters,* the JILA team demonstrated that 100-nanometer-wide gold beads, as expected because of their metallic nature, can be trapped and detected six times more easily than polystyrene particles of a similar size.

However, the scientists also found that gold absorbs light and heats up quickly, by a remarkable 266 degrees (Celsius) per watt of laser power, at the wavelength most often used in optical traps. Unless very low laser power is used, the heat could damage the molecules under study. Thus, gold beads would not be useful for temperature-sensitive experiments or applying force to molecules. But the heating effect could be useful in raising local temperatures in certain experiments, such as heating a protein just enough to allow scientists to watch it unfold, the paper suggests.

###

The work was supported by a W.M. Keck grant in the RNA Sciences, a Burroughs Wellcome Fund Career Award in the Biomedical Sciences, a National Institutes of Health training grant, the National Science Foundation, and NIST.

* Y. Seol, A.E. Carpenter, T.T. Perkins. 2006. Gold nanoparticles: enhanced optical trapping and sensitivity coupled with significant heating. Optics Letters. Aug. 15.

Contact: Laura Ost
National Institute of Standards and Technology (NIST)
 
 
 
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