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Positron Annihilation Lifetime Measurements in Collagen Biopolymer

Published online by Cambridge University Press:  15 February 2011

S. Siles ,
G. Moya ,
X.H. Li ,
J. Kansy  and
P. Moser
S. Siles
Affiliation:
Lab. de Biophysique, Faculté de Médecine de la Timone, 13385 Marseille, France
G. Moya
Affiliation:
Lab. de Physique des matériaux, Faculté des Sciences de St. Jérôme, 13397 Marseille, France
X.H. Li
Affiliation:
Lab. de Physique des matériaux, Faculté des Sciences de St. Jérôme, 13397 Marseille, France
J. Kansy
Affiliation:
Inst. of Phys. & Chem. of Metals, Silesian Univ., Bankowa 12, PL-40-007 Katowice, Poland
P. Moser
Affiliation:
DRFMC/SP2M/NM, CEA]Grenoble, 17 rue des Martyrs, 38054 Grenoble, France
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Abstract

Lifetime measurement in Positron Annihilation Spectroscopy (PAS) is applied to the study of free-volume collagen characteristics as a function of concentration. The lifetimes of positrons were obtained by a conventional fast-fast coincidence system. All lifetime data are fitted in three components by using the computer program POSITRON FIT and resolved. For each concentration, lifetime distributions were analyzed in order to obtain the different components, thus we have observed three components of which a long component τ3. This long lived component can be associated with a pick-off annihilation of ortho-positronium (o-Ps) trapped in free volumes of amorphous region. This investigation shows the potential of the positron annihilation spectroscopy technique in the study of biopolymer microstructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 530: Symposium CC – Biomaterials Regulating Cell Function & Tissue Development , 1998 , 33
Copyright
Copyright © Materials Research Society 1998

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References

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