ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The bioactivity of poled piezoelectric PLLA membrane was investigated by studying thecalcium phosphate formation in vitro using a biomimetic method. Samples (φ10mm) were poledunder DC electric field of 8~l0kV/cm at 70°C for 30 min followed by cooling under the electric field.Surface chemistry of the samples before and after poling treatment was studied by X-rayphotoelectron spectroscopy (XPS). Poled/unpoled samples were immersed in supersaturatedcalcification solution (SCS) for periods up to 24 h (36.5℃). The surface morphology and compositionof the soaked samples were evaluated by using scanning electron microscope (SEM) and X-raydiffraction analysis (XRD). Poled samples showed two different charged surfaces, negatively-chargedsurface (N-PLLA) and positively-charged surface (P-PLLA). On the N-PLLA surfaces, SEM togetherwith XRD showed a gradually formed calcium phosphate (Ca-P), while no obvious Ca-P on eitherP-PLLA or unpoled samples was observed. This study demonstrated that poled piezoelectric PLLAsubstrates induce substantially higher level of Ca-P formation than electrically neutral substrates andonly N-PLLA, however, can improve Ca-P formation after immersion in SCS
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.703.pdf
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