Results 211 to 220 of about 1,520 (264)

fineness of gold

2009
exaly   +2 more sources

Nano-Gold Catalysis in Fine Chemical Synthesis

Chemical Reviews, 2011
the National Natural Science Foundation of China (21073208);the Chinese Academy of ...
Yan, Zhang, Xinjiang, Cui, Feng, Shi, Youquan, Deng   +3 more
openaire   +2 more sources

Shrinkage in Fine Gold Wires

Canadian Metallurgical Quarterly, 1966
AbstractWe have studied the shrinkage behaviour of fine gold wires at 1040°C in a continuously pumped vacuum of 10−5 millimetres of mercury. We investigated the effect of variables such as wire diameter, number of grain boundaries, and stress on the strain rate and compared them with theoretical predictions. The measured strain rates are in fairly good
P.C. Mullick, G.B. Craig
openaire   +1 more source

Recovering gold from carbon fines by a gold transfer process

Mining, Metallurgy & Exploration, 2003
When activated carbon is used for recovering gold in the gold industry, carbon fines are generated in stripping, acid-washing and kiln regeneration circuits. The carbon fines at the Fort Knox mine, Fairbanks Gold Mining Inc., contain as much as 0.68 kg/t (20 oz/st) gold.
H. K. Lin, E. M. Hill, J. L. Oleson
openaire   +1 more source

Adhesion between fine gold particles

Philosophical Magazine A, 1978
Abstract A transmission electron microscope investigation has been performed on the adhesion properties of fine gold particles (typical radius 20–30 nm). The adhesion process is found to be intimately related to the crystallography of the particles and consists both of an elastic part and a plastic part, where twinning plays an important role. The main
I. Hansson, A. Thölén
openaire   +1 more source

Fine-Tuning the Shape of Gold Nanorods

Chemistry of Materials, 2005
Gold nanorods prepared by a seed-mediated growth approach use ∼4-nm gold nanospheres as the seeds and subsequent reduction of metal salt with a weak reducing agent (ascorbic acid) in the presence of a directing surfactant to produce nanorods. If insufficient ascorbic acid is added in the growth step, then metal salt remains.
Linfeng Gou, Catherine J. Murphy
openaire   +1 more source

Potential of Gold Nanoparticles for Oxidation in Fine Chemical Synthesis

Annual Review of Chemical and Biomolecular Engineering, 2012
In recent years supported gold nanoparticles have emerged as efficient catalysts with considerable synthetic potential for liquid-phase oxidation reactions based on molecular oxygen as oxidant. Here we critically review the most attractive applications related to the selective oxidation of functional groups containing O, N, or Si heteroatoms.
Mallat T, Baiker A
openaire   +3 more sources

Spectrometric determination of the fineness of gold

Analytica Chimica Acta, 1972
Abstract The use of the glow discharge source has been tested for the analysis of refined gold by direct reading emission spectrometry. Careful investigations of the discharge parameters and the introduction of the sputtering rate as internal standard led to a very precise and accurate analytical procedure which has been proved by analysing 100 ...
openaire   +1 more source

Metallographic Examination of Fine Gold and a Gold-Copper Alloy for Coin Manufacturing

Practical Metallography, 2018
Abstract The mechanical properties and microstructures of alloys play an important role in the different steps of the coin manufacturing process. Only few data are available for the precious metals gold and silver as well as for their respective alloys.
S. Greil, C. Edtmaier, R. Haubner, L. Lauter   +3 more
openaire   +1 more source

A study on the fine structure of the saccular macula of the gold fish

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1969
The fine structure of the saccular macula of the gold fish has been studied by means of the electron microscope.
openaire   +2 more sources