Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > New paper offers breakthrough on blinking molecules phenomena

Abstract:
A new paper by University of Notre Dame physicist Boldizsár Jankó and colleagues offers an important new understanding of an enduring mystery in chemical physics.

New paper offers breakthrough on blinking molecules phenomena

Notre Dame, IN | Posted on August 13th, 2010

More than a century ago, at the dawn of modern quantum mechanics, the Noble Prize-winning physicist Neils Bohr predicted so-called "quantum jumps." He predicted that these jumps would be due to electrons making transitions between discrete energy levels of individual atoms and molecules. Although controversial in Bohr's time, such quantum jumps were experimentally observed, and his prediction verified, in the 1980s. More recently, with the development of single molecule imaging techniques in the early 1990s, it has been possible to observe similar jumps in individual molecules.

Experimentally, these quantum jumps translate to discrete interruptions of the continuous emission from single molecules, revealing a phenomenon known as fluorescent intermittency or "blinking."

However, while certain instances of blinking can be directly ascribed to Bohr's original quantum jumps, many more cases exist where the observed fluorescence intermittency does not follow his predictions. Specifically, in systems as diverse as fluorescent proteins, single molecules and light harvesting complexes, single organic fluorophores, and, most recently, individual inorganic nanostructures, clear deviations from Bohr's predictions occur.

As a consequence, virtually all known fluorophores, including fluorescent quantum dots, rods and wires, exhibit unexplainable episodes of intermittent blinking in their emission.

The prevailing wisdom in the field of quantum mechanics was that the on and off blinking episodes were not correlated. However, at a 2007 conference on the phenomenon sponsored by Notre Dame's Institute for Theoretical Sciences, which Jankó directs, Fernando Stefani of the University of Buenos Aires presented research suggesting that there was, in fact, correlation between these on and off events. No theoretical model available at that time was able to explain these correlations.

In a 2008 Nature Physics paper, Jankó and a group of researchers that included Notre Dame chemistry professor Ken Kuno, physics visiting assistant professor Pavel Frantsuzov and Nobel Laureate Rudolph Marcus suggested that the on- and off-time intervals of intermittent nanocrystal quantum dots follow universal power law distributions. The discovery provided Jankó and other researchers in the field with the first hints for developing a deeper insight into the physical mechanism behind the vast range of on- and off-times in the intermittency.

In a new paper appearing in the journal Nano Letters, Jankó, Frantsuzov and Notre Dame graduate student Sándor Volkán-Kascó reveal that they have developed a model for the blinking phenomena that confirms what Stefani observed experimentally. The finding is important confirmation that strong correlation exists between the on and off phenomenon.

If the blinking process could be controlled, quantum dots could, for example, provide better, more stable imaging of cancer cells; provide researchers with real-time images of a viral infection, such as HIV, within a cell; lead to the development of a new generation of brighter display screens for computers, cell phones and other electronic applications; and even improved lighting fixtures for homes and offices.

The Nano Letters paper represents another important step in understanding the origins of the blinking phenomenon and identifying ways to control the process.

####

For more information, please click here

Contacts:
Boldizsár Jankó
professor of physics and director
Institute for Theoretical Sciences
574-850-9850

Copyright © University of Notre Dame

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Hong Kong Investors Bullish on Dais Analytic Invest $5.75M, Provide $60M Contract, and Create New Joint Venture Company March 26th, 2015

Industrial Nanotech, Inc. Announces Next Large Order from the Oil and Gas Industry March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Physics

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Quantum experiment verifies Einstein's 'spooky action at a distance': Griffith University, University of Tokyo homodyne measurements show what Einstein did not believe to be real: the non-local collapse of a particle's wave function March 25th, 2015

Bar-Ilan U. researchers identify 'tipping point' between quantum and classical worlds: Study sheds new light on 'spooky' quantum optics March 24th, 2015

Quantum cause and effect March 23rd, 2015

Display technology/LEDs/SS Lighting/OLEDs

Haydale Announce Dedicated Graphene Inks Manufacturing Capability March 25th, 2015

Caltech scientists develop cool process to make better graphene March 18th, 2015

Engineers create chameleon-like artificial 'skin' that shifts color on demand March 12th, 2015

Chemistry

First proof of isolated attosecond pulse generation at the carbon K-edge March 20th, 2015

Click! That's how modern chemistry bonds nanoparticles to a substrate March 19th, 2015

Possible Futures

Nanotechnology in Medical Devices Market is expected to reach $8.5 Billion by 2019 March 25th, 2015

Nanotechnology Enabled Drug Delivery to Influence Future Diagnosis and Treatments of Diseases March 21st, 2015

Nanocomposites Market Growth, Industry Outlook To 2020 by Grand View Research, Inc. March 21st, 2015

Nanotechnology Drug Delivery Market in the US 2012-2016 : Latest Report Available by Radiant Insights, Inc March 16th, 2015

Academic/Education

SUNY Poly & M+W Make Major Announcement: Major Expansion To Include M+W Owned Gehrlicher Solar America Corporation That Will Create up to 400 Jobs to Develop Solar Power Plants at SUNY Poly Sites Across New York State March 26th, 2015

SUNY POLY CNSE to Host First Ever Northeast Semi Supply Conference (NESCO) Conference Will Connect New and Emerging Innovators in the Northeastern US and Canada with Industry Leaders and Strategic Investors to Discuss Future Growth Opportunities in NYS March 25th, 2015

FEI Joins University of Ulm and CEOS on SALVE Project Research Collaboration: The Sub-Ĺngström Low Voltage Electron (SALVE) microscope should improve contrast and reduce damage on bio-molecules and two-dimensional nanomaterials, such as graphene March 18th, 2015

SUNY Poly CNSE, Known One Day a Year as SUNY PI CNSE, and Tech Valley High School Celebrate Pi Day: More than one hundred students enjoy pizza ‘pi’ as they take part in fun, pi-themed activities meant to share the excitement of mathematics and science in anticipation of March 14 March 14th, 2015

Nanomedicine

Application of Graphene Oxide in Body Implants in Iran March 26th, 2015

Nanorobotic agents open the blood-brain barrier, offering hope for new brain treatments March 25th, 2015

Nanotechnology in Medical Devices Market is expected to reach $8.5 Billion by 2019 March 25th, 2015

Iranian Scientists Eliminate Expensive Materials from Diabetes Diagnosis Sensors March 25th, 2015

Announcements

Industrial Nanotech, Inc. Announces Next Large Order from the Oil and Gas Industry March 26th, 2015

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Quantum compute this -- WSU mathematicians build code to take on toughest of cyber attacks: Revamped knapsack code offers online security for the future March 26th, 2015

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Square ice filling for a graphene sandwich March 26th, 2015

Application of Graphene Oxide in Body Implants in Iran March 26th, 2015

Nanobiotechnology

Dolomite’s microfluidics technology ideal for B cell encapsulation March 24th, 2015

Tiny bio-robot is a germ suited-up with graphene quantum dots March 24th, 2015

TGAC's take on the first portable DNA sequencing 'laboratory': First remote laboratory allows researchers to conduct real-time anaylsis March 19th, 2015

Super-resolution microscopes reveal the link between genome packaging and cell pluripotency: A study using super-resolution microscopy reveals that our genome is not regularly packaged and links these packaging differences to stem cell state March 12th, 2015

Quantum nanoscience

Thousands of atoms entangled with a single photon: Result could make atomic clocks more accurate March 26th, 2015

Bar-Ilan U. researchers identify 'tipping point' between quantum and classical worlds: Study sheds new light on 'spooky' quantum optics March 24th, 2015

Nanospheres cooled with light to explore the limits of quantum physics March 17th, 2015

Nanotechnology Helps Increasing Rate of Digital Data Processing, Storage March 9th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE