Silicon dioxide
hideThe chemical compound silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with a chemical formula of SiO2 and has been known for its hardness since antiquity. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. It is a principal component of most types of glass and substances such as concrete. Silica is the most abundant mineral in the Earth's crust.
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News tagged with silica
Materials scientists find better model for glass creation
Nov 04, 2009 |
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(PhysOrg.com) -- Harvard materials scientists have come up with what they believe is a new way to model the formation of glasses, a type of amorphous solid that includes common window glass.
In brief: A tiny, tunable well of light, and a string theorist's toolbox
Sep 21, 2009 |
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Promising photonic devices, and theorists attempt to determine whether particle physics and string theory can be reconciled.
Light at the speed of a bicycle and much more
Sep 09, 2009 |
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The speed of light, 300 million metres per second, was long thought an immutable constant and has defined our understanding of matter and energy but recent research in the area of optics and photonics is proving ...
Icy exposure creates armored polymer high tech foams
Nanotechnology / Nanomaterials
Jul 28, 2009 |
4.3 / 5 (6) |
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(PhysOrg.com) -- Chemists and engineers at the University of Warwick have found that exposing particular mixtures of polymer particles and other materials to sudden freeze-drying can create a high-tech armored foam that could ...
Green Ideas: Making Concrete from Rice
Jul 21, 2009 |
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(PhysOrg.com) -- Concrete accounts for about 5% of all human-related CO2 emissions. The fact that we use so much cement in building could mean that the issue becomes even more pronounced in the future. Bu ...
Scientists use bed bugs' own chemistry against them
Jun 02, 2009 |
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Scientists here have determined that combining bed bugs' own chemical signals with a common insect control agent makes that treatment more effective at killing the bugs.
Capsules Encapsulated: Enzyme-equipped liposomes embedded in polymer capsules as a novel biomedical transport system
May 19, 2009 |
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(PhysOrg.com) -- When cells cannot carry out the tasks required of them by our bodies, the result is disease. Nanobiotechnology researchers are looking for ways to allow synthetic systems take over simple cellular activities ...
Alchemy in Tanzania? Gas Becomes Solid at Surface of Oldoinyo Lengai Volcano
Space & Earth / Earth Sciences
May 06, 2009 |
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(PhysOrg.com) -- Science has unearthed the secret to what might have been alchemy at Oldoinyo Lengai volcano in Tanzania.
NASA Selects Material for Orion Spacecraft Heat Shield
Space & Earth / Space Exploration
Apr 07, 2009 |
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(PhysOrg.com) -- NASA has chosen the material for a heat shield that will protect a new generation of space explorers when they return from the moon. After extensive study, NASA has selected the Avcoat ablator system for ...
First tri-continuous mesoporous Silica complex structure developed in Singapore
Nanotechnology / Nanomaterials
Apr 05, 2009 |
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Singapore's Institute of Bioengineering and Nanotechnology (IBN) has developed the first tri-continuous mesoporous material using a unique surfactant template. This completely new porous structure previously been predicted ...
A Good Eye for Oxygen
Nanotechnology / Nanomaterials
Mar 27, 2009 |
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(PhysOrg.com) -- We cannot live without it; yet too much of it causes damage: oxygen is a critical component of many physiological and pathological processes in living cells. Oxygen deficiency in tissues is thus related to ...
Nanoparticle toxicity doesn't get wacky at the smallest sizes
Nanotechnology / Bio & Medicine
Feb 16, 2009 |
4 / 5 (4) |
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(PhysOrg.com) -- The smallest nano-sized silica particles used in biomedicine and engineering likely won't cause unexpected biological responses due to their size, according to work presented today. The result should allay ...
New insight to demineralization
Jul 07, 2008 |
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From toothpaste to technology, noncrystalline or amorphous silica is an active ingredient in a myriad of products that we use in our daily lives. As a minor, but essential component of vertebrate bone, an understanding of ...
