Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

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

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

VDMA Electronics Production Equipment: Growth track for 2014 and 2015 confirmed: Business climate survey shows robust industry sector November 14th, 2014

Open Materials Development Will Be Key for HP's Success in 3D Printing: HP can make a big splash in 3D printing, but it needs to shore up technology claims and avoid the temptation of the razor/razor blade business model in order to flourish November 11th, 2014

Nanomedicine

New research project supports internationalisation in nano-research: Launch of new “Baltic Sea Network” November 22nd, 2014

Quantum mechanical calculations reveal the hidden states of enzyme active sites November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Tokyo Institute of Technology research: Protein-engineered cages aid studies of cell functions November 19th, 2014

Announcements

Iranian Experts Clean Uranium-Contaminated Water by Nano-Particles November 23rd, 2014

Novel Method Found for Connection of Metallic Alloys to Polymers November 23rd, 2014

New research project supports internationalisation in nano-research: Launch of new “Baltic Sea Network” November 22nd, 2014

3rd Iran-Proposed Nano Standard Approved by International Standard Organization November 22nd, 2014

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 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE