Navigation Links
Nanoparticles reach new peaks
Date:1/3/2013

controlled laser pulses to tune the absorbance spectrum of plain gold colloids, Lapotko said. "This novel approach is counter to the established paradigm that assumes optical properties of nanoparticles are pre-set during their fabrication and stay constant during their optical excitation," he said.

The Rice lab showed basic colloidal gold nanoparticles could be efficiently activated by a short laser pulse at 780 nanometers, with an 88-fold amplification of the photothermal effect seen with a continuous laser. The researchers repeated their experiment with nanoparticle clusters in water, in living cancer cells and in animals, with the same or better results: they showed spectral peaks two nanometers wide. Such narrow photothermal spectra had never been seen for metal nanoparticles, either singularly or in clusters.

The effect appears to depend on vapor nanobubbles that form when the particles heat liquid in their immediate environment. The nanobubbles grow and burst in an instant. "Instead of using the nanoparticle as a heat sink with a continuous, stationary laser, we're creating a transient, nonstationary situation in which the particle interacts with the incident laser in a totally different way," Lapotko said. He said the effect is repeatable and works with laser pulses shorter than 100 picoseconds.

Even better, an experiment with mixed nanorods and nanoshells found they responded to laser pulses with strong, distinct signals at wavelengths 10 nanometers apart. That means two or more types of nanoparticles in the same location can be selectively activated on demand.

"The nanoparticles we used were nothing fancy; they were used in the 19th century by Michael Faraday, and it was believed they could do nothing in the near-infrared," he said. "That was the major motivation for people to invent nanorods, nanoshells and the other shapes. Here, we prove these inexpensive particles can behave quite well in near-infrared." He said the
'/>"/>

Contact: Mike Williams
mikewilliams@rice.edu
713-348-6728
Rice University
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Study reports iron oxide nanoparticles effective for labeling human endothelial cells
2. Synthetic and biological nanoparticles combined to produce new metamaterials
3. UC Davis researchers develop new drug delivery system for bladder cancer using nanoparticles
4. Nanoparticles reboot blood flow in brain
5. Nanoparticles added to platelets double internal injury survival rate
6. Oh, my stars and hexagons! DNA code shapes gold nanoparticles
7. Paints and coatings containing bactericidal agent nanoparticles combat marine fouling
8. Palladium-gold nanoparticles clean TCE a billion times faster than iron filings
9. From pomegranate peel to nanoparticles
10. NIST/UMass study finds evidence nanoparticles may increase plant DNA damage
11. Hybrid copper-gold nanoparticles convert CO2
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Nanoparticles reach new peaks
(Date:8/29/2014)... 29, 2014) Scientists at the Barshop Institute for ... Medicine at the UT Health Science Center at San ... tissues of the longest-lived rodent, the naked mole rat. ... cells of naked mole rats protects and alters the ... and obsolete proteins. , The factor also protects proteasome ...
(Date:8/29/2014)... release is available in German . ... players in the natural nitrogen cycle on Earth and ... bacteria were thought to depend on nitrite as their ... by Holger Daims, a microbiologist at the University of ... hydrogen as an alternative source of energy. The oxidation ...
(Date:8/29/2014)... Boulder, Colo., USA - The rise of the Tibetan ... on Earth -- is important for both its profound ... In this study published in GSA Bulletin , ... -- "clumped" isotope thermometry -- using modern and fossil ... Zhada basin in southwestern Tibet. , Views range ...
Breaking Biology News(10 mins):Factor in naked mole rat's cells enhances protein integrity 2Hydrogen powers important nitrogen-transforming bacteria 2Hydrogen powers important nitrogen-transforming bacteria 3Snails tell of the rise and fall of the Tibetan Plateau 2Snails tell of the rise and fall of the Tibetan Plateau 3Snails tell of the rise and fall of the Tibetan Plateau 4Snails tell of the rise and fall of the Tibetan Plateau 5Snails tell of the rise and fall of the Tibetan Plateau 6Snails tell of the rise and fall of the Tibetan Plateau 7
... (UH) executed two license agreements with SuperPower, a ... covers the intellectual property on second generation (2G) ... under the Sponsored Research Agreement (SRA) previously executed ... is led by Venkat Selvamanickam, M.D. Anderson chair ...
... the Ministry of Public Health and Sanitation, together with ... Adolescent Health), unveiled a renewed set of national policy ... by putting proven interventions to work within the country,s ... global progress against diarrhoea has stalled. Contrary to what ...
... with legends of European monarchs, frail heirs and one flamboyant ... the very treatments that can help can also put patients, ... an expensively produced protein that helps the blood to clot. ... and in a subset of those, it sets off an ...
Cached Biology News:SuperPower and UH sign high temperature superconducting wire license agreements 2Policy unveiled to combat diarrheal disease, a killer of Kenyan children 2Policy unveiled to combat diarrheal disease, a killer of Kenyan children 3Researchers harness the power of plants to fight hemophilia 2Researchers harness the power of plants to fight hemophilia 3Researchers harness the power of plants to fight hemophilia 4
(Date:8/28/2014)... NEW YORK , Aug. ... announces that a new market ... its catalogue: Whole ... (Systems, Kits (Library Preparation, Target ... Technology (Sequencing by Synthesis), by ...
(Date:8/28/2014)... 28, 2014  Armetheon, Inc. ( www.armetheon.com ), ... to late-stage cardiovascular drug candidates, today announced that ... round of financing. The Series A round was ... with participation from investors that included Atheneos Capital ... Larry Hsu , the founder of Impax ...
(Date:8/28/2014)... August 28, 2014 PrimeSource Building ... materials, selected SoundConnect to support their ... based audio and web conferencing platform GlobalMeet powered ... PrimeSource’s employees’ needs. SoundConnect delivers award winning ... PrimeSource Building Products will be utilizing GlobalMeet ...
(Date:8/27/2014)... Rhythm, a biopharmaceutical company developing peptide therapeutics ... in metabolic disorders, announced today that it has filed ... Securities and Exchange Commission (SEC) relating to the proposed ... The number of shares to be offered and the ... determined. Citigroup and Cowen and Company will ...
Breaking Biology Technology:Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 2Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 3Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 4Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 5Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 6Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 7Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 8Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 9Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 10Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 11Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 12Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 13Armetheon Completes $7.0 Million Series A Financing 2Armetheon Completes $7.0 Million Series A Financing 3PrimeSource Chooses SoundConnect as Collaboration Provider 2Rhythm Files Registration Statement for Proposed Initial Public Offering 2
...  A recent Van Andel Research Institute (VARI) study published in ... function of an essential plant hormone could profoundly change our ... to the development of new drugs for a variety of ... by the same team of investigators at VARI that was ...
... 2012  PinneyAssociates, Inc., a health care consulting firm with offices ... the following promotions, effective 1 January 2012: , ... , Lucy Owen, to Vice President, Program Operations and ... President , Joe Gitchell, to President , John ...
... Aethlon Medical, Inc. (OTCBB: AEMD), the ... address infectious disease, cancer and other life-threatening conditions, ... Therapy Scientific Advisory Board to guide the advancement ... from the Aethlon ADAPT™ system.  Aethlon recently established ...
Cached Biology Technology:Van Andel Research Institute Study Provides New Details of Fundamental Cellular Process 2PinneyAssociates Announces Senior Staff Promotions 2Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 2Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 3Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 4Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 5Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 6Aethlon Medical Establishes Extracorporeal Therapy Scientific Advisory Board 7
Plasmacytoid dendritic cells, BDCA-4+, For immunohistochemistry (IHC) Cell Chip with Human Umbilical Cord Blood Dendritic Cells...
...
...
Request Info...
Biology Products: