Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > News > Taking It One Particle at a Time: Two new characterization platforms reveal that there’s more than one way to size up a nanoparticle.

September 23rd, 2010

Taking It One Particle at a Time: Two new characterization platforms reveal that there’s more than one way to size up a nanoparticle.

Abstract:
Once upon a time, when particles were measured in micrometers and an optical microscope could do the heavy lifting, the size and distribution of particles in a solution were discovered through the strength of a researcher's eyesight.

To see the truly small particles, however, we needed to invent less direct solutions. After the invention of the laser, researchers determined that Rayleigh scattering could accomplish this task. As long as a particle is relatively small when compared to a given wavelength of light, it will scatter light in all directions. If it's highly-collimated light—a laser—it can be measured accurately, and the particle characteristics can be determined by watching how the intensity of reflect light changes over time. It's guaranteed to change, too, because all such small molecules are constantly moving about in Brownian motion.

This method, dynamic light scattering (DLS), has become the gold standard for characterization of very small particles since its invention not long after the laser. It is not, of course, the only way to analyze particles. Attenuators, sieves, filters, and centrifuges are all employed for larger particle sizes. But for analyzing samples containing broad distributions of species of widely differing molecular masses (such as proteins and aggregates), DLS is reliably the cost-effective choice.

Source:
rdmag.com

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

A 'smart dress' for oil-degrading bacteria July 24th, 2016

New remote-controlled microrobots for medical operations July 23rd, 2016

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

New probe developed for improved high resolution measurement of brain temperature: Improved accuracy could allow researchers to measure brain temperature in times of trauma when small deviations in temperature can lead to additional brain injury July 23rd, 2016

New Yale-developed device lengthens the life of quantum information July 22nd, 2016

Imaging

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

Discoveries

A 'smart dress' for oil-degrading bacteria July 24th, 2016

New remote-controlled microrobots for medical operations July 23rd, 2016

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

Quantum drag:University of Iowa physicist says current in one iron magnetic sheet can create quantized spin waves in another, separate sheet July 22nd, 2016

Announcements

A 'smart dress' for oil-degrading bacteria July 24th, 2016

New remote-controlled microrobots for medical operations July 23rd, 2016

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

New probe developed for improved high resolution measurement of brain temperature: Improved accuracy could allow researchers to measure brain temperature in times of trauma when small deviations in temperature can lead to additional brain injury July 23rd, 2016

Tools

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

The birth of quantum holography: Making holograms of single light particles! July 21st, 2016

Nanometrics Announces Upcoming Investor Events July 20th, 2016

A mini-antenna for the data processing of tomorrow: Nature Nanotechnology: Short-wavelength spin waves generated directly for the first time July 20th, 2016

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







Car Brands
Buy website traffic