Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




TECH SPACE
Levitating foam liquid under the spell of magnetic fields
by Staff Writers
Heidelberg, Germany (SPX) Nov 13, 2013


File image.

Foams fascinate, partly due to their short lifespan. Foams change as fluid drains out of their structure over time. It is precisely their ephemeral nature which has, until now, prevented scientists from experimentally probing their characteristic dynamics further. Instead, foams have often been studied theoretically.

Now, Nathan Isert from the University of Konstanz, Germany and colleagues, have devised a method of keeping foams in shape using a magnet, which allows their dynamics to be investigated experimentally, as recently described in EPJ E.

To find a way around the issue of drainage, the authors used the so-called diamagnetic levitation technique. This approach exploits the fact that water-which is one of the main components of foams-has a characteristic called diamagnetism.

This means that water molecules can become magnetised in the opposite direction to an applied magnetic field. Hence, a strong magnetic field can be used to levitate the water in a foam within the bore of a magnet of 18 Tesla in strength. This prevents drainage and allows a very high level of liquid to be maintained in the foam.

Isert and colleagues have used this approach to study the coarsening behaviour of foams with greatly varying liquid fractions. As a result, they experimentally verified the decades-old theoretical predictions for the growth in bubble size for dry as well as liquid foams.

They found that for a liquid fraction of about 30%-which corresponds to a foam with bubbles which start to no longer touch-the gas exchange between bubbles and the corresponding growth laws changes.

Next, they will study how the local microscopic dynamics influences the foam's global dynamics. This is of particular interest when the foam transitions from a liquid to a solid form.

N. Isert et al. (2013), Coarsening dynamics of three-dimensional levitated foams: from wet to dry, European Physical Journal E 36: 116, DOI 10.1140/epje/i2013-13116-x

.


Related Links
Springer
Space Technology News - Applications and Research






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





TECH SPACE
Snap to attention: Polymers that react and move to light
Pittsburgh PA (SPX) Nov 14, 2013
Microvehicles and other devices that can change shape or move with no power source other than a beam of light may be possible through research led by the University of Pittsburgh. The researchers are investigating polymers that "snap" when triggered by light, thereby converting light energy into mechanical work and potentially eliminating the need for traditional machine components such as switc ... read more


TECH SPACE
NASA's GRAIL Mission Puts a New Face on the Moon

Moon mission yields clues to face of 'man in the moon'

Shanghai-built lunar rover set for lunar landing

Crowdfunded Lunar Spacecraft Reaches Funding Milestone

TECH SPACE
MAVEN Aims To Answer Where Did the Water on Mars Go

Mission to Mars moon could be a sample-return twofer

India Mars mission back on track after engine glitch: scientists

Opportunity Maneuvering Around A Dune Field

TECH SPACE
NASA says new deep space vehicle on time for 2014 test

NASA's Orion Sees Flawless Fairing Separation in Second Test

Lockheed Martin Team Tests Orion's Protective Panels

UCF Lands NASA-Funded Center, Linchpin for Future Space Missions

TECH SPACE
China shows off moon rover model before space launch

China providing space training

China launches experimental satellite Shijian-16

China Moon Rover A New Opportunity To Explore Our Nearest Neighbor

TECH SPACE
Russians take Olympic torch on historic spacewalk

Russia launches Sochi Olympic torch into space

Spaceflight Joins with NanoRacks to Deploy Satellites from the ISS

Crew Completes Preparations for Soyuz Move

TECH SPACE
ASTRA 5B lands in French Guiana for its upcoming Ariane 5 flight

Kazakhstan say Baikonur launch site may be open to Western countries

ESA Swarm launch postponed

Europe's fifth ATV for launch by Arianespace begins its pre-flight checkout at the Spaceport

TECH SPACE
NASA Kepler Results Usher in a New Era of Astronomy

Astronomers answer key question: How common are habitable planets?

One in five Sun-like stars may have Earth-like planets

Mystery World Baffles Astronomers

TECH SPACE
Altering surface textures in 'counterintuitive manner' may lead to cooling efficiency gains

Methane-munching microorganisms meddle with metals

Researchers at Penn Add Another Tool in Their Directed Assembly Toolkit

NASA Brings Earth Science 'Big Data' to the Cloud with Amazon Web Services




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. 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 Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement