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Facilely tuning the surface wettability of Cu mesh for multi-functional applications
Xingwang Zhao,Fei Mao,Jiayue Wu,Jinglei Lei,Lingjie Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The Cu meshes with reversible super-wettability have multifunctions of self-cleaning, oil–water separation,floating-oil collection and underwater oil lossless-transportation. However, the facile method totune the surface wettability and prepare reversibly super-wetting Cu meshes remains a great challenge. In this work, one-step chemical-etching method was used to construct the hierarchically-structured CuOof nano-sheets and micro-clusters on Cu meshes to provide suitable surface roughness essential forsuper-wettability. The surface wettability of Cu mesh was then facilely tuned by controlling the adsorptionand desorption of C-containing species at the Cu mesh surface through C-rich ambience storage andIR irradiation for short duration. The super-wetting transition of Cu meshes betweensuperhydrophobicity/superoleophilicity and superhydrophilicity/underwater-superoleophobicity couldrepeat for many cycles. Moreover, the super-wetting Cu meshes demonstrated excellent mechanical,physical and chemical stabilities. The switchable super-wettability endowed the Cu meshes with integratedmulti-functions, which demonstrated remarkable performance of self-cleaning, oil–water separation,floating-oil collection and underwater oil lossless-transportation. This study suggests that utilizingC-rich ambience storage and IR irradiation to control the content of C-containing species at the Cu meshsurface is a facile and effective way to tune the surface wettability of Cu meshes, which can be easilyextended to realize super-wettability transition of various materials.
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Performance Analysis of NOMA-based Relaying Networks with Transceiver Hardware Impairments
( Chao Deng ),( Xiaoya Zhao ),( Di Zhang ),( Xingwang Li ),( Jingjing Li ),( Charles C. Cavalcante ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.9
In this paper, the performance of non-orthogonal multiple access (NOMA) dual-hop (DH) amplify-and-forward (AF) relaying networks is investigated, where Nakagami-m fading channel is considered. In order to cover more details, in our analysis, the transceiver hardware impairments at source, relay and destination nodes are comprehensively considered. To characterize the effects of hardware impairments brought in NOMA DH AF relaying networks, the analytical closed-form expressions for the exact outage probability and approximate ergodic sum rate are derived. In addition, the asymptotic analysis of the outage probability and ergodic sum rate at high signal-to-noise ratio (SNR) regime are carried out in order to further reveal the insights of the parameters for hardware impairments on the network performance. Simulation results indicate the performance of asymptotic ergodic sum rate are limited by levels of distortion noise.
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