#platinum
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A*STAR scientists have used first-principles computer simulations to explain why small platinum nanoparticles are less effective catalysts than larger ones.
Platinum nanoparticles are used in the catalysis of many reactions, including the important hydrogen evolution reaction used in fuel cells and for separating water into oxygen and hydrogen. Improved effectiveness of platinum nanoparticles to catalyze this reaction had been experimentally shown with decreasing nanoparticle size until it fell below about 3 nm. There was no clear explanation for why catalytic activity was reduced at this scale.
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Catalysts are extremely important in variety of fields of industry, especially in energy sector. However, nowadays they are mostly made from platinum – one of the scarcest metals in the Earth’s crust. This means that production of them is rather expensive and difficult. But now scientists a…
The Effects of Hot Isostatic Pressing of Platinum Alloy Castings on Mechanical Properties and Microstructures http://www.technology.matthey.com/article/59/3/207-217/
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Ateam led by researchers at the UCLA Henry Samueli School of Engineering and Applied Science has developed nanostructures made from a compound of three metals that increases the efficiency and durability of fuel cells while lowering the cost to produce them. Their solution addresses vexing…
A new fabrication technique that produces platinum hollow nanocages with ultra-thin walls could dramatically reduce the amount of the costly metal needed to provide catalytic activity in such applications as fuel cells. A transmission electron microscope image shows a typical sample of platinum…
Nano-raspberries May Bear Fueling Fruit
Researchers at the National Institute of Standards and Technology (NIST) have developed a fast, simple process for making platinum “nano-raspberries” — microscopic clusters of nanoscale particles of the precious metal. The berry-like shape is significant because it has a high surface area, which is helpful in the design of catalysts. Even better news for industrial chemists: the researchers figured out when and why the berry clusters clump into larger bunches of “nano-grapes.”
The research could help make fuel cells more practical. Nanoparticles can act as catalysts to help convert methanol to electricity in fuel cells. NIST’s 40-minute process for making nano-raspberries, described in a new paper, has several advantages. The high surface area of the berries encourages efficient reactions. In addition, the NIST process uses water, a benign or “green” solvent. And the bunches catalyze methanol reactions consistently and are stable at room temperature for at least eight weeks.
Read more: http://www.laboratoryequipment.com/news/2015/06/nano-raspberries-may-bear-fueling-fruit
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“Swag” Necklace by Viren Bhagat
Platinum, Pearls and Diamonds
Source: Robb Report via Pinterest
Platinum plasma in our sputter system.
Plasma is the fourth state of matter (in addition to solids, liquids, and gases) that can be best described as an ionized gas. It is a high energy state, in which there is sufficient energy to strip electrons from atoms or molecules in a gas. The plasma glows because when the electrons recombine with atoms, energy is released in the form of light. The color of the light depends on the composition of the plasma. The plasma in this picture is purple mainly because of the argon ions used to bombard the platinum.
Surprisingly, even though plasma is probably one of the least known of the states of matter, it is the most common in the universe. Examples of plasmas encountered in nature include lightning, some types of flames, nebulae, and stars.
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The Tree of Life is an important symbol used by many theology, philosophy and mythology. It symbolizes the connection between heaven and earth and the underworld. This historical symbol has been reinterpreted by Gustav Klimt’s famous wall painting, The Tree of Life. The symbol of life and it continues to inspire many branches of art. @taffinjewelry , which has a unique place in the jewelery world with its original style, has also designed a brooch by not being indifferent to the Tree of Life. he used the piece of wood to stick to the authenticity of this symbol. In the brooch, the body of which was made of wood material, the detail that gave life to the leaves was jadeite and spinels. With the perfection of nature and the infinity of human intelligence, Life looks like a green tree. ( details of brooch ; Designed as a tree of palissander wood, set with marquise-shaped jadeite cabochon leaves of highly translucent brilliant emerald green colour, interspersed throughout with circular-cut red spinels resembling ripened peaches, mounted in platinum and 18 karat yellow gold, signed.
Cabochons approximately 7.49 x 2.80mm to 13.05 x 5.00mm. ) #taffin #gustavklimt #treeoflife #spinel #jadeite #wood #palissanderwood #platinum #brooch #arthistory #artwork #couture #jewelrydesign #jewellery #jewels )
https://www.instagram.com/p/CThEIkfoQED/?utm_medium=tumblr
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A reed before the wind lives on, while mighty oaks do fall.
Truly magnificent Art Deco platinum diamond ring brooch
www.antiquejewel.com/11132-0013
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