NDLI: Experimental modeling of interaction between the carbon pyroceram heart valve and human blood plasma and formation of a protective nanosized coating

Content Provider	Springer Nature Link
Author	Lavrenko, V. A. Zolkin, P. I. Talash, V. N. Tatariv, V. F. Kostikov, V. I.
Copyright Year	2011
Abstract	The nanocrystalline material of an artificial heart valve sintered from 15 wt.% B$_{4}$C with crystals <10 nm in size uniformly distributed in 85 wt.% carbon with particles about 10 nm in size has exceptionally high chemical stability in human blood plasma. The electrochemical interaction resulting from contact of the valve surface with a potential trace impurity (for example, iron) is experimentally modeled by polarization from an external current source to simulate an extreme corrosion event. The interaction kinetics is studied at 37°C using the method of anodic polarization curves. The elemental composition of interaction products is analyzed by emission spectroscopy using a DFS-13 spectrograph; the composition and thickness of the film layers formed on the valve surface during electrolysis are determined with quantitative Auger electron spectroscopy using a Riber LAS-2000 device. It is established that a nanocrystalline film 350 nm thick forms after 3 h electrolysis on the ceramic surface of the heart valve. The film contains to 94.0 at.% C and to 6.0 at.% N (including to 89.5 at.% C as nanocrystalline graphite and to 4.5 at.% C as nanocrystalline C$_{3}$N$_{4}$, as well as to 6.0 at.% N in C$_{3}$N$_{4}$) and an insignificant amount of sulfur and inclusions of boron and oxygen atoms. It is shown that the film results from the discharge of anions of corresponding α-amino acids (amino acid remains of complex blood protein chains) containing heterocycle rings.
Starting Page	62
Ending Page	66
Page Count	5
File Format	PDF
ISSN	10681302
Journal	Powder Metallurgy and Metal Ceramics
Volume Number	50
Issue Number	1-2
e-ISSN	15739066
Language	English
Publisher	Springer US
Publisher Date	2011-06-22
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	carbon–B$_{4}$C composite blood plasma interaction mechanisms electrochemical polarization nanocrystalline film Metallic Materials Ceramics, Glass, Composites, Natural Methods Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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