THE CHARACTERIZATION OF COMPLEX SYSTEMS OF CHEMICAL REACTIONS

1989 ◽  
Vol 83 (1) ◽  
pp. 221-240 ◽  
Author(s):  
JOHN HAPPEL ◽  
PETER H. SELLERS
Keyword(s):  
Complex Systems ◽  
Chemical Reactions

Characterization of Complex Systems by Aperiodic Driving Forces

1989 ◽  
Author(s):  
Daniel Bensen ◽  
Michael Welge ◽  
Alfred Huebler ◽  
Norman Packard
Keyword(s):  
Complex Systems ◽  
Driving Forces

Interface Characterization of Different Apatite Coatings

1998 ◽  
Author(s):  
N. Antolotti ◽  
S. Bertini ◽  
A. Scrivani ◽  
C. Fanara ◽  
F. Rustichelli ◽  
...  
Keyword(s):  
Metal Surface ◽  
Calcium Oxide ◽  
Chemical Reactions ◽  
Metallic Substrate ◽  
Metal Interface ◽  
Interface Characterization ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Abstract The decomposition of bioactive plasma sprayed apatite layers and the weakness of their interface with the metallic substrate limit the longevity of orthopaedic prostheses. Analysis of the coating and of the metal-apatite different techniques (EDS, XPS, IR) indicates alterations of the apatite composition which can be related to several chemical reactions occurring either in the plasma or on the surface of the implant. EDS shows a calcium-rich layer on the apatite side of the interface whereas after dissolution of the apatite, XPS indicates that phosphorus atoms are incorporated in the metal surface. Depending on the rate of decomposition, calcium oxide may possibly form and weaken the apatite-metal interface. Fluorohydroxyapatite coating, have proven to decompose less and differently and to be more effective than hydroxyapatite coatings.

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