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Bioactive Materials · 2017 ·Vol. 3 ·期 1 ·74-79 · IF 0

Incorporating catechol into electroactive polypyrrole nanowires on titanium to promote hydroxyapatite formation

Zhengao Wang,Jinquan Zeng,Guoxin Tan,Jingwen Liao,Lei Zhou,Junqi Chen,Peng Yu,Qiyou Wang,Chengyun Ning

To improve the osteointegration property of biomedical titanium, nano-architectured electroactive coating was synthesized through the electrochemical polymerization of dopamine and pyrrole. The highly binding affinity of Ca 2+ to the catechol moiety of doped dopamine enabled efficient interaction between polypyrrole/polydopamine nanowires and mineral ions. The results indicate that the PPy/PDA nanowires preserved its efficient electro-activity and accelerated the hydroxyapatite deposition in a simulated body fluid. The PPy/PDA nanowires coating could be applied to promote the osteointegration of titanium implant.

研究领域: 生物材料学 · 骨科学 · 表面工程 · 组织工程 · 生物医学工程 · 纳米医学

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Journal of Materials Chemistry A · 2013 ·Vol. 1 ·期 47 ·14943-14950 · IF 0

Carbon nanotube reinforced polypyrrole nanowire network as a high-performance supercapacitor electrode

Hai Fu,Zhong-jie Du,Wei Zou,Hang-quan Li,Chen Zhang

A carbon nanotube reinforced polypyrrole nanowire network was constructed by in situ polymerization of pyrrole in the presence of carbon nanotubes using cetyltrimethylammonium bromide micelles as a soft template. Carbon nanotubes as a reinforcer were embedded into a network of polypyrrole nanowires, thus retaining in the latter a complete network. The resulting network possessed a specific surface area of 112.1 m2 g−1 and a rough porous structure. The embedding of carbon nanotubes decreased the charge transfer resistance in the polypyrrole nanowires and allowed easy access and rapid diffusion of ions/electrons. When applied as a capacitive electrode, a specific capacitance of 183.2 F g−1 was observed at a current density of 8 A g−1. The specific capacitance retention was 85% after 1000 cycles at 1 A g−1. An asymmetric supercapacitor was fabricated using the network as a positive electrode and active carbon as a negative electrode, and when operated at a maximum voltage of 1.5 V, had a high energy density (15.1 W h kg−1 at 3000 W kg−1). A long-term cycling test of the asymmetric supercapacitor at a current density of 1 A g−1 displayed a capacitance retention of 72% even after 3000 cycles of charge and discharge.

研究领域: 材料科学 · 纳米科技 · 电化学 · 能源存储 · 高分子科学

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Incorporating catechol into electroactive polypyrrole nanowires on titanium to promote hydroxyapatite formation

Carbon nanotube reinforced polypyrrole nanowire network as a high-performance supercapacitor electrode