Domain For SALE !!

Contact admin :

Accept SECURE Crypto Escrow

2011-2012 a record airplanes Alaska gold mining Almunium an ounce and Diamond Simulants astra mining Au auction Australian Gold Fields bank banks Banro barrick gold base metal based bauxite BHP Billiton Biggest Miner bigtruck Bitcoin Bitcoin Mining Hardware Blasting Blue Diamonds bullion bullion market Bullion reached a record Bullion rose buying Buying and Selling Diamonds and Gemstones canada mining Canadian investment fund industry canadian miner carbon cassiterite cat caterpillar Central Bank Gold Reserves Central Bank Purchases of Gold Central Fund of Canada Champagne Diamonds Chemical Formula Clarity and Carat weight coin coin gold collected Colour comex new york commodities companies cons Conveying copper Copper Issue 2011-2012 Cost Analysis Country Gold Reserves Crushing Cut Data Mining demand in Europe Diamond Business diamond mine location Diamond Mining Village diamonds dips discovery metals limited discussing Dividend Drilling ductile dumptruck dumptrucks earning Economic Benefits of Electronics Recycling Economic Opportunities Electronic Recycling element Engineering enterprise escort Estimated gold price in 2012 ETF euros FACILITIES AND UTILITIES for E-RECYCLING Ferrous Resources finance financial freeport fund gained gem global gold Gold approaching gold bar Gold Bars gold benefits gold bounces gold bullion Gold bullion prices 2012 gold bullion traders GOLD coin Gold Demand Gold depository services gold exchange gold fields Gold from Computer Parts gold fund gold futures Gold in Industrial Application Gold increase to a record price Gold Investment Gold Investment Product Demand Strong Gold Market GOLD Mining GOLD mining EQUIPMENT Gold Mining Stocks Gold Ore Production Freeport Gold Price Gold price in 2012 gold price per gram usd Gold Price Recovery gold priced Gold Prices in 2012 gold prices per ounce gold purity Gold rush Gold rush discovery Gold spot market price movement Gold Stock looks very attractive for change gold trader gold trading gold worth the risk Gold’s premium goldcorp goldnews goldprices Green Diamonds Hard Disk Computer Hauling held holdings How to Estimate Karat of Gold How to Invest Gold Human Resources Management in New York increase International Regulation invest invest gold invested investing gold investment investor investors Investors are now making a $130 billion bet on gold Iron iron ore Is Gold a Metal? Issue Issues in RECYCLING Japan is the only country that exports gold without being a major producer jewelry Johanesburg South African kinross kiyosaki LEGAL STRUCTURES List Platinum Mines South Africa Loading logistics london gold London’s luxury Magnesium manganese market market gold market value Martin mercury metal metal gold metal mining METAL Refining Metallic metalnews Metals mine mineral minerals Minerals Industry Mining Mining Business Mining Companies mining congress Mining Game mining group mining guide mining news mining occur mining palladium metal Mining Software mining truck miningnews Minnesota and Bechtel Moly Mines Ltd Most Expensive METAL motherboards Mutual Funds of Gold Investments Newmont Mining Corporation (NMC) nickel No Transunion Check Accounts Operations Osmium ounce oz palladium palladium weiƟgold pan american metals papua Pink Champagne Diamonds Pink Diamonds platinum platinum and palladium Platinum Group Metal Mining Companies platinum mining location precious metal precious metals price price gold bullion Price of Gold Today prices prices gold Prices of GOLD Processing producers production Profit Project pros PT Newmont Nusa Tenggara Indonesia rare reach record Refine Gold from PC Motherboards Refine Silver from Keyboard Computer resource Rhodium prices 2012 rise rising gold sands scrap gold Scrap metal prices Sell selling Shanghai Gold Exchange share silver Silver Coins Minting silver lake resources Silver Mining Companies silver prices Silver prices in 2012 silver standar silvercorp SOCIAL AND ENVIRONMENTAL CHALLENGES spot gold spot gold prices Stainless Steell Steel stock stock market Supply Management taconite tantalum the Comex The International Copper Study Group The World Gold Council the world’s largest miner thin film this year on Timing the gold market tin Titanium tons of bullion GOLD Top Companies in the Precious Metals Top Mining Companies TOP Reasons why GOLD is a GOOD Investment Top Silver Producer 2012 total gold demand trade Trade Gold Trail Transunion Dispute trucks Twin types of diamonds union uranium Urban Mining Value of Diamonds vena resources waste Waste Electrical and Electronic Equipment watertruck what is bitcoin What is Electronic Waste what is mining When is The Best Time To Buy Gold When is the best time to invest in gold White Diamonds Why invest in gold wide wideload worker world gold demand Yellow Diamonds

Color Generattion of Colloidal Gold

The intense red to purple color seen for the Purple of Cassius pigment is achieved by precipitating a colloidal gold solution onto a solid oxide substrate, typically tin oxide. To maximize color intensity,the gold particles need to be unagglomerated and less than 40 nm in size. The color effect is caused by a narrow adsorption band at 520 nm, referred to as the surface plasmon resonance band. If particles agglomerate together and increase above 40 nm, a blue shift occurs and light scattering starts to dominate, resulting in muddy color hues. In 1902, Gustav Mie [112], using classical electromagnetic theory, calculated from bulk properties of metallic gold the absorbance of colloid gold particles as a function of the particle size. His theoretical work also predicted that the wavelength of the plasmon band depends on the shape, surface composition, and dielectric environment of the gold particles.

These concepts are used in modern-day production and research and development to predict and control the color effects associated with Purple of Cassius. For example, most gold colloid solutions seen in the literature are as dispersions in water with fairly consistent dielectric constants. When considering glass enamels, the glass media in which the colloid is dispersed may consist of many different components, all with vastly different dielectric constants. This can lead to massive differences in hue and color strength for the final gold enamels. A practical demonstration illustrating the effect of dielectric constant of the surrounding metal oxide on color shift. Gold nanoparticles of approximately the same size (before and after heat treatment) have been deposited onto three oxides having differing dielectric values. It can clearly be seen that the oxides with low dielectric constants such as silica have red shifts whereas high dielectric materials such as titania shift the color to blue shades which is in accordance with predictions made by Mie. Another strategy for controlling the color is to alloy silver with gold. According to Mie, additions of silver will shift the plasmon band to a shorter wavelength and hence make the particles appear redder. Theory predicts that a single plasmon band with alloys having up to 25% silver will exist, but above this level two peaks appear, one caused by silver and the other gold. In practice, an excess of silver is used to redden off the gold.