PURE PLATINUM

Home Ice ◽  
2018 ◽  
pp. 139-141
Keyword(s):  
Pure Platinum

scholarly journals Micro-crystalline structure of platinum

1902 ◽  
Vol 69 (451-458) ◽  
pp. 433-435
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Crystalline Structure ◽  
Aqua Regia ◽  
Pure Platinum ◽  
Small Ingot

The crystalline structure of platinum does not appear to have been studied, although it forms an interesting subject for investigation. A small ingot of pure platinum was obtained for the experiments. A section was cut therefrom and machined to 5/16 inch square and 1/10 inch in thickness. The section was then carefully polished and etched in aqua regia of the following strength :— 4 parts of hydrochloric acid (sp. gr. 1·2). 1 part of nitric acid (sp. gr. 1·42).

scholarly journals VI. On the practical measurement of temperature: Experiments made at the Cavendish laboratory, Cambridge

1887 ◽  
Vol 178 ◽  
pp. 161-230 ◽  
Keyword(s):  
High Temperatures ◽  
Electrical Resistance ◽  
Platinum Wire ◽  
Cavendish Laboratory ◽  
Pure Platinum ◽  
Practical Measurement

In view of the enormous discrepancies at present existing in estimates of high temperatures, it is exceedingly desirable that strictly comparable thermometric standards should be issued by some recognised authority. Professor J. J. Thomson, in the course of a conversation which I had with him towards the close of 1885, suggested th at such standards could be issued in the form of platinum wire, the change of electrical resistance with temperature being determined by comparison for each specimen before issuing. The object of the present investigation was to test whether, in spite of the B. A. report on the Siemens pyrometer (1874), pure platinum wire might not be possessed of the necessary qualifications for such a standard.

THE PREPARATION OF PURE PLATINUM.1

1921 ◽  
Vol 43 (6) ◽  
pp. 1268-1273 ◽  
Author(s):  
Edward Wichers
Keyword(s):  
Pure Platinum

ChemInform Abstract: Electrocatalysis of Inorganic Reactions: Pure Platinum Surfaces

ChemInform ◽  
2013 ◽  
Vol 44 (12) ◽  
pp. no-no
Author(s):  
Thomas J. Schmidt ◽  
Nenad M. Markovic
Keyword(s):  
Pure Platinum ◽  
Platinum Surfaces ◽  
Inorganic Reactions

Directed synthesis of isomerically pure platinum pyrazole complexes

2006 ◽  
Vol 55 (2) ◽  
pp. 247-255 ◽  
Author(s):  
A. V. Khripun ◽  
M. Haukka ◽  
V. Yu. Kukushkin
Keyword(s):  
Pure Platinum ◽  
Directed Synthesis

Synthesis and Structure of Enantiomerically Pure Platinum Complexes of Phosphino-oxazolines and Their Use in Asymmetric Catalysis

1999 ◽  
Vol 18 (15) ◽  
pp. 2867-2873 ◽  
Author(s):  
A. John Blacker ◽  
Matthew L. Clarke ◽  
Michael S. Loft ◽  
Mary F. Mahon ◽  
Jonathan M. J. Williams
Keyword(s):  
Asymmetric Catalysis ◽  
Platinum Complexes ◽  
Enantiomerically Pure ◽  
Pure Platinum

Comparative Potentiodynamic Study of Nickel and Hydrogen Underpotential Deposition at Polycrystalline Platinum Electrode in Weak Acid and Neutral Solutions

2005 ◽  
Vol 494 ◽  
pp. 241-246 ◽  
Author(s):  
M.D. Obradović ◽  
B.N. Grgur ◽  
Lj.M. Vračar
Keyword(s):  
Fuel Cells ◽  
Platinum Electrode ◽  
Underpotential Deposition ◽  
Weak Acid ◽  
Adsorption Parameters ◽  
Cyclic Voltammetric ◽  
Pure Platinum ◽  
Hydride Formation ◽  
Polycrystalline Platinum ◽  
Voltammetric Technique

Underpotential deposition of nickel and hydrogen on polycrystalline platinum in weak acid and neutral solutions (3.5 ≤ pH ≤ 7.0), with and without Ni2+-ions, has been examined using cyclic voltammetric technique in the range of temperature from 274 to 313 K. The nickel and hydrogen ad-atom surface coverages were calculated from the voltammetric adsorption and desorption charges. The Temkin isotherm was fitted for both underpotential depositions, and thermodynamic adsorption parameters were calculated for both atoms. The value of the bonding energy between hydrogen and surface in the presence of underpotentially deposited nickel was calculated and found to amount to 287 kJ mol-1, which is 40 kJ mol-1 stronger bond than the same of pure platinum. The presence of nickel on the surface facilitates interfacial transfer of hydrogen into the metal bulk and consequent hydride formation significant in design of hydrogen based fuel cells.

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