Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > News > Quantum Dots Get Smaller

May 13th, 2005

Quantum Dots Get Smaller

Abstract:
For all the hype about nanotechnology, sometimes small isn't quite small enough. Quantum dots enable imaging advances in fields from oncology to neuroscience, yet at a whopping dozen nanometers or more, sometimes they're just too big. "They're the size of proteins," says Marcel P. Bruchez, cofounding scientist at Quantum Dots Corp. "Anything you can do to minimize the size will minimize the impact on the biological system."

A quantum dot's size governs the color of light it emits, but the size that determines the optical properties is only the core-shell. The problem is that for biological applications, quantum dots must be changed from being hydrophobic as grown, to hydrophilic, without a loss in fluorescence or stability.

The solution is to create the high-tech equivalent of a peanut M&M: a semiconductor core (usually cadmium sulfide, selenide, or telluride), coated by an insulating shell, which is then given a ligand coating, sometimes called a cap. The amphiphilic ligand is hydrophobic where it interfaces with the shell and hydrophilic where it interfaces with the biological conjugate (e.g., antibodies, peptides, or oligonucleotides) and the environment.

Source:
* The Scientist

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Quantum Dots Corp.

Moungi Bawendi

Shimon Weiss

Evident Technologies

Shuming Nie

Related News Press

Possible Futures

Researchers bring optical communication onto silicon chips: Ultrathin films of a semiconductor that emits and detects light can be stacked on top of silicon wafers October 23rd, 2017

Nanotube fiber antennas as capable as copper: Rice University researchers show their flexible fibers work well but weigh much less October 23rd, 2017

Novel 'converter' heralds breakthrough in ultra-fast data processing at nanoscale: Invention bagged four patents and could potentially make microprocessor chips work 1,000 times faster October 20th, 2017

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Nanomedicine

Arrowhead Pharmaceuticals Reports Inducement Grants under NASDAQ Marketplace Rule 5635(c)(4) October 23rd, 2017

Arrowhead Presents Promising Preclinical Data on Development of ARO-AAT for Treatment of Alpha-1 Liver Disease at Liver Meeting(R) 2017 October 23rd, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Arrowhead Pharmaceuticals to Present Preclinical Data on ARO-AAT at The Liver Meeting(R) October 10th, 2017

Announcements

Arrowhead Pharmaceuticals Reports Inducement Grants under NASDAQ Marketplace Rule 5635(c)(4) October 23rd, 2017

Researchers bring optical communication onto silicon chips: Ultrathin films of a semiconductor that emits and detects light can be stacked on top of silicon wafers October 23rd, 2017

Nanotube fiber antennas as capable as copper: Rice University researchers show their flexible fibers work well but weigh much less October 23rd, 2017

Arrowhead Presents Promising Preclinical Data on Development of ARO-AAT for Treatment of Alpha-1 Liver Disease at Liver Meeting(R) 2017 October 23rd, 2017

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