کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1430206 | 987197 | 2010 | 4 صفحه PDF | دانلود رایگان |
The aim of the study was to fabricate a biodegradable bio-composite using only natural biological precursors for both composite components, i.e., for a support and for a filler. Bio-composites of biomorphous structure were prepared using monolithic blocks of yucca (Yucca flaccida) carbonised at 550 °C as a stiff porous skeleton, and chitosan as a filler that coated the internal surface of the skeleton by a thin film. Highly porous supports and the resultant biomorphous composites were characterized by means of TGA, SEM, low-temperature physical adsorption of nitrogen, as well as electric and ultrasonic measurements. The resultant bio-composites were found to be very light materials with density of about 0.13 g/cm3 and very porous (over 90%). They were found to be hierarchically ordered anisotropic structures with a stiff skeleton of dynamic elastic moduli up to 0.8 GPa. The specific surface area was found to be 72 m2/g giving a surface area of chitosan film equal to about 12 m2 for a block sample of a volume of 2 cm3. Covering porous support by thin film of chitosan resulted in the increase of electrical conductivity of the resultant composite.
Journal: Materials Science and Engineering: C - Volume 30, Issue 2, 30 January 2010, Pages 273–276