Gold properties

Hamilton, S.M., Cameron, E.M., McClenaghan, M.B., Hall, G.E.M. 2004a. Redox, pH and SP variation over mineralization in thick glacial overburden. Part I methodologies and field investigation at the Marsh Zone gold property. Geochemistry Exploration, Environment, Analysis, 4, 33-44. 

Electrical conductivities of typical shallow groundwater in glacial terrain (Shoot Zone gold property, northwestern Ontario) and those of common bedrock materials converted from the usual resistivity units (from Keller and Frischknecht, 1966)... 

Effects of Alloying Elements on Select Gold Properties... 

Valden M, Lai X and Goodman D W 1998 Onset of catalytic activity of gold clusters on titania with the appearance of nonmetallic properties Science 281 1647... 

A pletliora of different SA systems have been reported in tire literature. Examples include organosilanes on hydroxylated surfaces, alkanetliiols on gold, silver, copper and platinum, dialkyl disulphides on gold, alcohols and amines on platinum and carboxyl acids on aluminium oxide and silver. Some examples and references can be found in [123]. More recently also phosphonic and phosphoric esters on aluminium oxides have been reported [124, 125]. Only a small selection out of tliis number of SA systems can be presented here and properties such as kinetics, tliennal, chemical and mechanical stability are briefly presented for alkanetliiols on gold as an example. 

Regarding protein adsorjrtion properties, differently tenrrinated SAMs on gold have also been investigated [2251. It was found Arat Are nature of Are adsorbate chain stmcture was Are most importairt parameter for Are observed behaviour towards protein aird cell adsorjrtion. 

Atre S V, Liedberg B and Allara D L 1995 Chain length dependenoe of the struoture and wetting properties in binary oomposition monolayers of OH and CHj-terminated alkanethiolates on gold Langmuir 3882-93... 

In addition to tire standard model systems described above, more exotic particles have been prepared witli certain unusual properties, of which we will mention a few. For instance, using seeded growtli teclmiques, particles have been developed witli a silica shell which surrounds a core of a different composition, such as particles witli magnetic [12], fluorescent [13] or gold cores [14]. Anotlier example is tliat of spheres of polytetrafluoroetliylene (PTFE), which are optically anisotropic because tire core is crystalline [15]. 

Figure C2.17.13. A model calculation of the optical absorjDtion of gold nanocrystals. The fonnalism outlined in the text is used to calculate the absorjDtion cross section of bulk gold (solid curve) and of gold nanoparticles of 3 mn (long dashes), 2 mn (short dashes) and 1 mn (dots) radius. The bulk dielectric properties are obtained from a cubic spline fit to the data of [237]. The small blue shift and substantial broadening which result from the mean free path limitation are...

Yu Y efa/1997 Gold nanorods electrochemical synthesis and optical properties J. Phys. Chem. B 101 6661... 

Wilcoxon J P, Williamson R L and Baughman R 1993 Optical properties of gold colloids formed in inverse micelles J. Chem. Phys. 98 9933... 

Elghanian R ef a/1999 Seleotive oolorimetrio deteotion of polynuoleotides based on the distanoe-dependent optioal properties of gold nanopartioles Sc/e/ ce 277 1078... 

Bromine has a lower electron affinity and electrode potential than chlorine but is still a very reactive element. It combines violently with alkali metals and reacts spontaneously with phosphorus, arsenic and antimony. When heated it reacts with many other elements, including gold, but it does not attack platinum, and silver forms a protective film of silver bromide. Because of the strong oxidising properties, bromine, like fluorine and chlorine, tends to form compounds with the electropositive element in a high oxidation state. 

Metallic gold, which is found free in nature, has always been valued for its nobility, i.e. its resistance to chemical attack. This property is to be expected from its position in the electrochemical series. It... 

Mercury has been known for many centuries, perhaps because its extraction is easy it has an almost unique appearance, it readily displaces gold from its ores and it forms amalgams with many other metals—all properties which caused the alchemists to regard it as one of the fundamental substances. 

Siepmann J I and I R McDonald 1993b. Monte Carlo Study of the Properties of Self-assembh Monolayers Formed by Adsorption of CH3(CH2)i5SH on the (111) Surface of Gold. Molecul Physics 79 457-473. 

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