Navigation Links
Nanoscopic particles resist full encapsulation, Sandia simulations show
Date:10/12/2010

ALBUQUERQUE, N.M. It may seem obvious that dunking relatively spherical objects in a sauce blueberries in melted chocolate, say will result in an array of completely encapsulated berries.

Relying on that concept, fabricators of spherical nanoparticles have similarly dunked their wares in protective coatings in the belief such encapsulations would prevent clumping and unwanted chemical interactions with solvents.

Unfortunately, reactions in the nanoworld are not logical extensions of the macroworld, Sandia National Laboratories researchers Matthew Lane and Gary Grest have found.

In a cover article this past summer in Physical Review Letters, the researchers use molecular dynamics simulations to show that simple coatings are incapable of fully covering each spherical nanoparticle in a set.

Instead, because the diameter of a particle may be smaller than the thickness of the coating protecting it, the curvature of the particle surface as it rapidly drops away from its attached coating provokes the formation of a series of louvres rather than a solid protective wall (see illustration).

"We've known for some time now that nanoparticles are special, and that 'small is different,'" Lane said. "What we've shown is that this general rule for nanotechnology applies to how we coat particles, too."

Carlos Gutierrez, manager of Sandia's Surfaces and Interface Sciences Department, said, "It's well-known that aggregation of nanoparticles in suspension is presently an obstacle to their commercial and industrial use. The simulations show that even coatings fully and uniformly applied to spherical nanoparticles are significantly distorted at the water-vapor interface."

Said Grest, "You don't want aggregation because you want the particles to stay distributed throughout the product to achieve uniformity. If you have particles of, say, micron-size, you have to coat or electrically charge them so the particles don't stick together. But when particles get small and the coatings become comparable in size to the particles, the shapes they form are asymmetric rather than spherical. Spherical particles keep their distance; asymmetric particles may stick to each other."

The simulation's finding isn't necessarily a bad thing, for this reason: Though each particle is coated asymmetrically, the asymmetry is consistent for any given set. Said another way, all coated nanoscopic sets are asymmetric in their own way.

A predictable, identical variation occurring in every member of a nanoset could open doors to new applications.

"What we've done here is to put up a large 'dead end' sign to prevent researchers from wasting time going down the wrong path," Lane said. "Increasing surface density of the coating or its molecular chain length isn't going to improve patchy coatings, as it would for larger particles. But there are numerous other possible paths to new outcomes when you can control the shape of the aggregation."


'/>"/>

Contact: Neal Singer
nsinger@sandia.gov
505-845-7078
DOE/Sandia National Laboratories
Source:Eurekalert  

Related biology technology :

1. NC State engineers discover nanoparticles can break on through
2. Engineering nanoparticles for maximum strength
3. RVX-208 Data Demonstrates Increase in Functional HDL Particles
4. Surface plasmon resonances of metal nanoparticles in array can have narrower spectral widths
5. Enhancing solar cells with nanoparticles
6. Nanoparticles double their chances of getting into sticky situations
7. Gold-palladium nanoparticles achieve greener, smarter production of hydrogen peroxide
8. Safer nanoparticles spotlight tumors, deliver drugs
9. Paper electrified by copper particles
10. Nanotech particles affect brain development in mice
11. New discovery reveals fate of nanoparticles in human cells
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Nanoscopic particles resist full encapsulation, Sandia simulations show
(Date:5/24/2016)... , ... May 24, 2016 , ... ... diabetes, and traumatic injuries, will be accelerated by research at Worcester Polytechnic Institute ... engines of wound healing and tissue regeneration. , The novel method, developed by ...
(Date:5/24/2016)... Rockville, Maryland (PRWEB) , ... May 24, 2016 ... ... introduction of a newly re-branded identity. The new Media Cybernetics corporate branding reflects ... the world of imaging and image analysis. The re-branding components include a crisp, ...
(Date:5/23/2016)... Ind. , May 23, 2016 Zimmer Biomet ... musculoskeletal healthcare, today announced that its Board of Directors has ... for the second quarter of 2016. The ... or about July 29, 2016 to stockholders of record as ... declarations of dividends are subject to approval of the Board ...
(Date:5/23/2016)... Carolina (PRWEB) , ... May 23, 2016 , ... ... and building management solutions and services based in Aurora, Ohio, has broken ground ... established business in the Research Triangle Park area, this new location solidifies a ...
Breaking Biology Technology:
(Date:3/31/2016)... BOCA RATON, Florida , March 31, 2016 /PRNewswire/ ... LEGX ) ("LegacyXChange" or the "Company") ... presentation for potential users of its soon to be ... The video ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also ... by the use of DNA technology to an industry ...
(Date:3/22/2016)... PROVO and SANDY, Utah ... Ontario (NSO), which operates the highest sample volume laboratory ... and Tute Genomics and UNIConnect, leaders in clinical sequencing ... announced the launch of a project to establish the ... panel. NSO has been contracted by ...
(Date:3/15/2016)... -- Yissum Research Development Company of the Hebrew ... Hebrew University, announced today the formation of Neteera ... human biological indicators. Neteera Technologies has completed its first ... ... emissions from sweat ducts, enables reliable and speedy biometric ...
Breaking Biology News(10 mins):