期刊
SCIENCE OF ADVANCED MATERIALS
卷 4, 期 2, 页码 187-192出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sam.2012.1271
关键词
Cellulose Nanofibrils; Hydroxyapatite; Nanocomposites; Biomimetic Mineralization
资金
- Beijing Natural Science Foundation [2112031]
- Beijing Forestry University [BLYJ201105]
Cellulose nanofibril/hydroxyapatite (CNF/HA) nanocomposites were produced via biomimetic mineralization using two-dimensional cellulose nanofibrils (CNF) as templates. Characterization of the resulting CNF/HA nanocomposites was performed by atomic force microscopy (AFM), X-ray diffractometry (XRD), fast Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). HA nanosphere particles possessing poor crystallinity and lower crystal size precipitated onto the surface of the CNF, as revealed by AFM. Increasing immersion time correlated with a characteristic sharpening of HA peaks, which indicated thickening of the mineralization layer and increase in HA crystallinity. FTIR analysis indicated that the strength of CNF-HA hydrogen bonding exceeded that of the original CNF-CNF bonding. The thermal stability of the materials was increased following HA precipitation onto the CNF, leading to an increase in thermal decomposition temperature from 330 degrees C for pure CNF to 350 degrees C for CNF/HA nanocomposites. For poly(lactic acid) (PLA) materials, PLA/CNF/HA composites demonstrated superior thermal stability and mechanical properties relative to those offered by their PLA/CNF counterparts. Because of their robust properties and relative ease of production, CNF/HA dual nanocomposite materials represent a valid option as commercial multi-functional fillers.
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