Effect of the pH on the piezoelectric properties of collagen films
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED
TECHNOLOGY, 83 (1-3):
165-172 (2001)DOI: 10.1016/S0921-5107(01)00520-7
Аннотация
In this paper, we did a study of the physicochemical, dielectric and
piezoelectric properties of collagen films, considering the development
of new biomaterials which have potential applications in coating of
cardiovascular prostheses, support for cellular growth and in systems
for controlled drug delivery. The piezoelectric strain tenser element
d(14), the elastic constant S-55, and the dielectric permittivity
epsilon (11) were measured for collagen films. it was observed that the
collagen samples submitted to different pH treatment lead to different electrical behavior. For sample S2. (pH = 5.2) one has a higher denaturation temperature (T-d = 80.55 degreesC), lowest density (rho =
909.6 kg m(-3)), highest dielectric function, lowest frequency constant product (f x L = 320.33 kHz.m) and higher piezoelectricity (d(14) =
0.122 pC/N) which is our major interest in this study. The loss factor
Q(-1) measured for all the samples shows that for all the electrodes
dimensions sample S2 present the highest loss factor which is between
0.68 and 0.76. We believe that the different pH treatment is critical to
the final level of organization of the microscopic structure of the
sample. which could result in an increase of the piezoelectricity. (C)
2001 Elsevier Science B.V. All rights reserved.