Earth Science News  





.
WATER WORLD
Nanomaterial filters bacteria from water

disclaimer: image is for illustration purposes only
by Staff Writers
Buffalo, N.Y. (UPI) Feb 22, 2011
U.S. researchers say a newly developed nanomaterial could help solve the age-old public health problem of removing harmful bacteria from drinking water.

Working with a special kind of polymer called a block copolymer, researchers at the University of Buffalo have synthesized a filter nanomembrane containing pores large enough for water to slip through easily but too small for bacteria, a UB release reported Monday.

Water molecules and bacteria are both measured in nanometers, a unit of length 100,000 times thinner than the width of a human hair.

A single water molecule is less than a nanometer wide, while even the most diminutive bacteria are a couple hundred nanometers.

The challenge for researchers was to develop a filter medium with pores large enough to pass water molecules but small enough to trap and block bacteria.

The new block copolymer material has evenly spaced pores about 55 nanometers in diameter, perfect for the task, researchers say.

"These materials present new opportunities for use as filtration membranes," Javid Rzayev, UB assistant professor of chemistry, says.

"Commercial membranes have limitations as far as pore density or uniformity of the pore size. The membranes prepared from block copolymers have a very dense distribution of pores, and the pores are uniform.

"Making pores bigger increases the flow of water, which will translate into cost and time savings," he said. "At the same time, 50 to 100 nanometer diameter pores are small enough not to allow any bacteria through. So, that is a sweet spot for this kind of application."




Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
Water News - Science, Technology and Politics



Tempur-Pedic Mattress Comparison

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News
WATER WORLD
ADB to lend $1 bn for clean water in Vietnam
Hanoi (AFP) Feb 22, 2011
Thousands of families in Vietnam's largest city will get their own water supply for the first time under a programme funded by a $1 billion loan from the Asian Development Bank (ADB), the bank said Tuesday. Almost 20,000 families in Ho Chi Minh City will get piped water by the end of 2015 under the scheme, which will also improve water pressure and coverage for hundreds of thousands of other ... read more

.
Get Our Free Newsletters Via Email
  


WATER WORLD
NZealand quake refugees swap tales of survival

Lingering trauma one year after deadly Chile quake

Frantic hunt as NZ quake leaves 400 dead, missing

Better Mapping Of Human Settlements Supports Disaster Management

WATER WORLD
Turning To Nature For Inspiration

Apple stockholders keep CEO succession plan private

HP stock slides on trimmed earnings forecast

Plants That Can Move Inspire New Adaptive Structures

WATER WORLD
Nanomaterial filters bacteria from water

Brown Tide Culprit Sequenced: Genome Of The First Of Algal Bloom Species

Water filter for disaster use developed

Oldest Water On Earth

WATER WORLD
Carbon Sink At South Pole Has Grown Recently

Massive iceberg shears off glacier after quake hit

Climate change halves Peru glacier: official

Shifting Biomes In Alaska

WATER WORLD
Genetically modified crops on the rise

Multiple Approaches Necessary To Tackle World's Food Problems

EU agrees to allow traces of GM crops in EU animal feed

Two New Plants Discovered In Spain

WATER WORLD
No signs of life as NZ quake toll rises to 113

Distressed residents flee New Zealand quake city

Child dies under volcanic ash cloud in Philippines

Mud volcano set to erupt for quarter-century - scientists

WATER WORLD
Ivory Coast envoy reports for duty

New 'environment governance' on agenda in Nairobi

Nigerian troops uncover weapons cache

Three soldiers killed by Casamance rebels: military source

WATER WORLD
Remains of Ice Age child found in Alaska

Men's cosmetics take off in China

Study: Low self-esteem increases bias

Testing The Limits Of Where Humans Can Live


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement