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SELF-ASSEMBLY OF GOLD NANORODS ON WRINKLED TEMPLATE
YUJIA LIANG,QIAN LIU,YONG XIE,ZHENING ZHU,YINGLU JI,XIAOCHUN WU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.7
Self-assembly of nanoparticles has attracted more attention in the last decade due to theirpotential applications in many ¯elds, such as sensors, surface-enhanced Raman scattering (SERS)substrate and optical/plasmonic components. Wrinkles, as one kind of common natural surface,are used to be a template/substrate in micro°uidic sieves and solar cells. In this work, a wrinkledtemplate with depth of about 200 nm and period of 1.64 ? m is used for modulating the self-assemblyprocess of gold nanorods (GNRs) to obtain patterned self-assemblies for potential application. Inorder to fully re°ect the role of the wrinkled template in the self-assembly, the templates are placeduprightly in the GNRs solution to intensify the interplay between the wrinkled surface andnanorods. The self-assembly process is carried out in a climate chamber, where the temperatureand humidity can be controlled programmingly to modulate the self-assembly conditions. Theexperimental results show that for the ¯xed wrinkled template, an obvious e®ect on the self-assembly is at the temperature range from 30?C to 50?C. Nematic, curved (mostly are end-to-end)and transition mode can be obtained. According to humidity, GNRs tend to form the nematicfashion in humidity lower than 60%, and the curved fashion in a higher humidity.
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Improved Switching Ripple Suppression Strategy for Multi-Paralleled Grid-Connected Inverters System
Wu Cao,Haotian Kang,Kangli Liu,Shunyu Wang,Jianfeng Zhao,Xiaochun Ji,Jun Zhao 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The switching operations of inverters in the distributed system inevitably introduce high-frequency harmonics into grid, which may make influences on electrical devices. To address it, this paper proposes a ripple suppression strategy based on active cancellation combined with passive filtering. The active cancellation is realized by carrier-phase-shift (CPS) technique and the passive filtering is achieved by filters. Furthermore, two component-shared LCL-type filters improved by traditional LCL filters are studied from the points of resonance and accuracy of gridinjected current. To valid the effectiveness of the proposed strategy, simulations and experimental test are carried out. The results show that the proposed strategy can effectively suppress high-frequency harmonics and two componentshared LCL-type filters can become promising filters for the multi-paralleled grid-connected inverters.
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