Quantcast

Latest Colloid Stories

2012-01-26 12:36:24

To understand long-range interactions between particles at the micrometric scale, researchers utilize methods which are used to study the formation of our universe. Scientists have found that micron-size particles which are trapped at fluid interfaces exhibit a collective dynamic that is subject to seemingly unrelated governing laws. These laws show a smooth transitioning from long-ranged cosmological-style gravitational attraction down to short-range attractive and repulsive forces. The...

2011-12-23 10:55:11

Microscopic spheres form strings in surprising alignments when suspended in a viscous fluid and sheared between two plates – a finding that will affect the way scientists think about the properties of such wide-ranging substances as shampoo and futuristic computer chips. A team of scientists at Cornell University and the University of Chicago have imaged this behavior and have explained the forces causing it for the first time. Its findings appear in the Dec. 19-23 early edition of...

2011-12-10 01:57:20

Physical equilibrium, assumed to be almost instant, may take months or years for particles in oil-water mixtures By studying the behavior of tiny particles at an interface between oil and water, researchers at Harvard have discovered that stabilized emulsions may take longer to reach equilibrium than previously thought. Much longer, in fact. "We were looking at what we thought would be a very simple phenomenon, and we found something very strange," says principal investigator...

2011-10-11 13:49:34

Nanoparticles of a substance can be counted and the size distribution can be determined by dispersing the nanoparticles into a gas. But some nanoparticles tend to aggregate when the surrounding conditions change. Scientists at the University of Gothenburg, Sweden, have shown that it is possible to sort and count the particles, even when they have formed aggregates. "Nanoparticles are already used in many everyday products, such as sunscreen and cosmetics. It is important to be able to...

Image 1 - It's All In The Mix With Fluid Physics In Space
2011-10-05 03:38:03

If you had the choice between a product that you had to shake before use and one that came premixed, you'd probably buy the one that was easier to use and worked best. Industries are aware of this, and of the benefits of products with a reputation of functioning as promised, use after use. In an effort to secure even better product formulas, Procter & Gamble Co., or P&G, decided to take their research to a higher level -- aboard the orbiting laboratory of the International Space...

2011-08-31 23:38:08

In solid materials with regular atomic structures, figuring out weak points where the material will break under stress is relatively easy. But for disordered solids, like glass or sand, their disordered nature makes such predictions much more daunting tasks. Now, a collaboration combining a theoretical model with a first-of-its kind experiment has demonstrated a novel method for identifying “soft spots” in such materials. The findings from University of Pennsylvania and...

2011-08-08 12:18:17

A liquid does not have to be a disordered bunch of particles: A team of researchers at Vienna University of Technology (TU Vienna) and the University of Vienna has discovered intriguing structures formed by tiny particles floating in liquids. Under mechanical strain, particle clusters in liquids can spontaneously form strings and dramatically alter the properties of the liquid. What is common to blood, ink and gruel? They are all liquids in which tiny particles are suspended "“ so...

2011-08-03 14:36:52

Scientists have found opal-like crystals in the Tagish Lake meteorite, which fell to Earth in Canada in 2000. This is the first extraterrestrial discovery of these unusual crystals, which may have formed in the primordial cloud of dust that produced the sun and planets of our solar system 4.6 billion years ago, according to a report in the Journal of the American Chemical Society. Katsuo Tsukamoto and colleagues say that colloidal crystals such as opals, which form as an orderly array of...

2011-07-25 15:42:51

Latex paints and drug suspensions such as insulin or amoxicillin that do not need to be shaken or stirred may be possible thanks to a new understanding of how particles separate in liquids, according to Penn State chemical engineers, who have developed a method for predicting the way colloidal components separate based on energy. "The ongoing assumption was that if you have a mixture of different sized particles in a liquid, the faster-settling particles will end up on the bottom," said...


Word of the Day
jument
  • A beast of burden; also, a beast in general.
'Jument' ultimately comes from the Latin 'jugum,' yoke.
Related