Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Nano water filter: sieve holds nanoparticles in place

Abstract:
A membrane consisting of polymer fibres and proteins would make a novel filter for tiny, nano-scaled particles in aqueous solutions. The result of such research, done by Professor Mady Elbahri and his team from the Institute of Material Science at Kiel University and the Institute of Polymer Research at Helmholtz-Zentrum Geesthacht, has recently been published as the cover article in the issue 22 of Advanced Functional Materials.

Nano water filter: sieve holds nanoparticles in place

Germany | Posted on November 29th, 2012

A nanofluid, a colloidal suspension of, for example, metal nanoparticles in water, passes easily through commonly used macroporous polymeric membranes. The particles are too small to be held using hole diameters between three and four micrometers. In addition, the particles would block smaller sieve openings rapidly. Hence, pressure would be necessary to filter out the fluid.

In order to solve these problems, Elbahri and his team biofunctionalized their membrane and added a commercially available protein to the fibres. "We found out that the protein undergoes a conformational change under water, and its ability to capture all the metal nanoparticles during the filtration process is activated", explains Elbahri. "This is a breakthrough", adds co-author Dr. Shahin Homaeigohar. "The same principle will hopefully enable us to filter bio-molecules and organisms out of waste water."

From filtration to solar thermal energy

When the nano sieve captures metal particles such as gold, another application is at hand, as no other method has succeeded in dispersing the particles so well. "This result was unexpected", says Elbahri. "Under dry conditions, the membrane shows the color of the metal, in this case the red of the gold nanoparticles". When the membrane gets wet, it becomes black. "Then it acts as an omnidirectional perfect black absorber, which can be used as a solar absorber." Elbahri adds: "Indeed we bridge the gaps between several disciplines - chemistry, physics, bioscience and materials science that is - and the Nanochemistry and Nanoengineering group has now initiated the first step toward intradisciplinarity of nanoscience."

Application as a virus and bio-filter

The nano sieve will allow filtering of very small particles or biomolecules and organisms such as viruses out of water. The scientists involved have already patented their innovation, a bio-nano-composite, in Europe. Another patent for the USA is on its way. Besides its application in water filtration, the nano sieve shows great potentials as solar absorber and as a catalyser. "All in all, the result is a breakthrough towards the design of an operative filtration process, as a new route for the fabrication of functional materials, and offers commercially attractive efficiencies at a low cost", says Elbahri.

####

For more information, please click here

Copyright © Wiley-VCH Materials Science Journals

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 Links

Link to the original paper on Wiley Online Library:

Related News Press

News and information

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

ATTOPSEMI Technology Joins FDXcelerator Program to Deliver Advanced Non-Volatile Memory IP to GLOBALFOUNDRIES 22 FDX Technology Platform: Leading-edge I-fuse brings higher reliability, smaller cell size and ease of programmability for consumer, automotive, and IoT applications March 27th, 2017

Leti and HORIBA Scientific to Host Webinar on Ultrafast Characterization Tool: Plasma Profiling Time-of-Flight Mass Spectrometer Tool Cuts Optimization Time In Layer Deposition and Fabrication of Wide Range of Applications March 27th, 2017

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Discoveries

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

A big leap toward tinier lines: Self-assembly technique could lead to long-awaited, simple method for making smaller microchip patterns March 27th, 2017

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Researchers make flexible glass for tiny medical devices: Glass can bend over and over again on a nanoscale March 27th, 2017

Materials/Metamaterials

Researchers make flexible glass for tiny medical devices: Glass can bend over and over again on a nanoscale March 27th, 2017

Argon is not the 'dope' for metallic hydrogen March 24th, 2017

Promising results obtained with a new electrocatalyst that reduces the need for platinum: Researchers from Aalto University have succeeded in manufacturing electrocatalysts used for storing electric energy with one-hundredth of the amount of platinum that is usually needed March 24th, 2017

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Announcements

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

ATTOPSEMI Technology Joins FDXcelerator Program to Deliver Advanced Non-Volatile Memory IP to GLOBALFOUNDRIES 22 FDX Technology Platform: Leading-edge I-fuse brings higher reliability, smaller cell size and ease of programmability for consumer, automotive, and IoT applications March 27th, 2017

Leti and HORIBA Scientific to Host Webinar on Ultrafast Characterization Tool: Plasma Profiling Time-of-Flight Mass Spectrometer Tool Cuts Optimization Time In Layer Deposition and Fabrication of Wide Range of Applications March 27th, 2017

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Water

Rare-earths become water-repellent only as they age March 22nd, 2017

Nano-level lubricant tuning improves material for electronic devices and surface coatings February 11th, 2017

Tough aqua material for water purification: Decontamination of water with a robust and sustainable membrane assembled from 2 synergistically working components January 24th, 2017

Scientists have discovered a new state of matter for water January 2nd, 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