Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > SPEEK low sulfonation and filter

Abstract:
Membranes for high temperature nanofiltration often run into problems because the polymers that constitute the membrane either decompose or leach out and this compromises the performance of the membrane. Nanofiltration membranes usually contain charged polymers, which are used to reject particular ions or compounds in solution. One of the polymers which are often used for these membranes is SPEEK, sulfonated poly(ether ether ketone), due to its high thermal and mechanical stability. The problem, in this case, is that to introduce enough charges into the membrane, SPEEK with a high degree of sulfonation (30% or higher) is usually used, and this typically compromises its high temperature performance, and sometimes even room-temperature storage.

SPEEK low sulfonation and filter

Germany | Posted on September 6th, 2012

To solve these issues, Wei Yang and co-workers at Tianjin University, in a paper published in the Journal of Applied Polymer Science, have prepared a SPEEK membrane with very low degree of sulfonation, by using methylsulfonic acid as a solvent, to make it possible to prepare a membrane with a degree of sulfonation of about 7%. The advantage of this low degree of sulfonation is the good degree of thermal stability, with the onset of decomposition of the sulfonate groups starting around 350 degrees Celsius, but small weight loss due to the low degree of sulfonation.

The authors tested the membrane's nanofiltration performance using two model dyes, and showed that, up to 80 degrees Celsius, the membranes filter out 90% and 80% of each of the two dyes respectively, with flux increasing with temperature and selectivity decreasing with temperature.

While this membrane will need further study, it shows promise as a high temperature nanofiltration platform.

####

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

Nano Ruffles in Brain Matter: Freiburg researchers decipher the role of nanostructures around brain cells in central nervous system function October 31st, 2014

Gold nanoparticle chains confine light to the nanoscale October 31st, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Device invented at Johns Hopkins provides up-close look at cancer on the move: Microscopic view of metastasis could give insight about how to keep cancer in check October 31st, 2014

Discoveries

Nano Ruffles in Brain Matter: Freiburg researchers decipher the role of nanostructures around brain cells in central nervous system function October 31st, 2014

Gold nanoparticle chains confine light to the nanoscale October 31st, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Device invented at Johns Hopkins provides up-close look at cancer on the move: Microscopic view of metastasis could give insight about how to keep cancer in check October 31st, 2014

Materials/Metamaterials

Production of Biocompatible Polymers in Iran October 30th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

Watching the hidden life of materials: Ultrafast electron diffraction experiments open a new window on the microscopic world October 27th, 2014

Polymeric Scaffold Recreates Bladder Tissue October 27th, 2014

Announcements

Nano Ruffles in Brain Matter: Freiburg researchers decipher the role of nanostructures around brain cells in central nervous system function October 31st, 2014

Gold nanoparticle chains confine light to the nanoscale October 31st, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Device invented at Johns Hopkins provides up-close look at cancer on the move: Microscopic view of metastasis could give insight about how to keep cancer in check October 31st, 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