0 mm) and the SE R , which together with SE A + SE R are shown in Figure 6b. It can be seen that the SE T increased CFTRinh-172 purchase from 24 dB in the low frequencies to 39 dB at 18 GHz. The contribution to the SE T was mainly from the reflection in the low frequency range and from the absorption in the high range. The EMI shielding efficiency is attributed to the formation of conducting interconnected nanofiber networks in an insulating paraffin wax matrix that will interact with the incident
radiation and lead to the high shielding effectiveness. Conclusions The pyrolysis of bacterial cellulose led to the formation of a unique interconnected web-like network of Selleckchem DMXAA Carbon nanoribbons, and this was used to fabricate carbon-matrix composites. These composites had remarkable imaginary permittivities and huge loss click here tangents and thus good attenuating properties. The web-like networks were very helpful for increasing the dielectric loss. The electromagnetic properties could be optimized by manipulating the bacterial nanoribbons by doping or surface modification; and thus, the RL and SE T could be further improved. Based on these properties, and taking into account its other advantages, such as its light weight, easy processability, high mechanical strength, and good dispersion in the matrices, such CBC has the potential to be as an effective EMI shielding material and microwave
absorber. Acknowledgements We thank Prof. C. H. Pei for the helpful discussions and Dr. J. S. Liu for the technical assistance. This work was supported by the National Basic Research Program of China (no. 2011CB612212), the Program for New Century Excellent Talents in University (no. MCET-11-1061), and the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (no. 11zxfk26) of Branched chain aminotransferase China. References 1. Baughman RH, Zakhidov AA, Heer WA: Carbon nanotubes–the route toward applications. Science 2002,297(5582):787–792.CrossRef 2. Watts PCP, Hsu WK, Barnes A, Chambers B: High permittivity
from defective multiwalled carbon nanotubes in the X-band. Adv Mater 2003,15(7–8):600–603.CrossRef 3. Yang YL, Gupta MC, Dudley KL, Lawrence RW: Conductive carbon nanofiber-polymer foam structures. Adv Mater 2005,17(16):1999–2003.CrossRef 4. Tang N, Zhong W, Au C, Yang Y, Han M, Lin K: Synthesis, microwave electromagnetic and microwave absorption properties of twin carbon nanocoils. J Phys Chem C 2008,112(49):19316–19323.CrossRef 5. Liu XG, Ou ZQ, Geng DY, Han Z, Jiang JJ, Liu W: Influence of a graphite shell on the thermal and electromagnetic characteristics of FeNi nanoparticles. Carbon 2010,48(3):891–897.CrossRef 6. Wang G, Gao Z, Tang S, Chen C, Duan F, Zhao S, Lin S, Feng Y, Zhou L, Qin Y: Microwave absorption properties of carbon nanocoils coated with highly controlled magnetic materials by atomic layer deposition. ACS Nano 2012,6(12):11009–11017. 7.