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| 1 | Advances of drag-reducing surface technologies in turbulence based on boundary layer control显示文摘Our living environment is surrounded by turbulence, which is also a concern of the global energy consumption and the greenhouse gas emission, and the viscous force on the solid-liquid/solid-gas interface is an important part of the turbulence. Reducing friction force in turbulence to the greatest extent is becoming an urgent issue to be resolved at present. In this paper, the various state-of-the-art approaches of drag-reducing and energy-saving technologies based on the boundary layer control are reviewed, focusing on the polymer drag reduction additives, the micro-morphology, the super-hydrophobic surface, the micro air bubbles, the heating wall, the vibrant flexible wall and the composite drag reduction methods. In addition, the mechanisms of different drag reductions based on the boundary layer control and the potential applications in fluid engineering are discussed. This paper aims not only to contribute to a better understanding of drag reduction mechanisms, but also to offer new perspectives to improve the current drag-reducing and energy saving technologies. | LUO Yuehao WANG Liguo GREEN Lork SONG Kenan WANG Liang SMITH Robert | 2015 | Journal of Hydrodynamics2015，27，4： | 8 |
| 2 | Reinforcing carbonized polyacrylonitrile fibers with nanoscale graphitic interface-layers显示文摘Carbon fibers going through stabilization,carbonization,and graphitization heat-treatment stages will form continuous graphitic layers that are closely packed and preferentially aligned along the fiber axis,forming high mechanical stiffness or strength and electrical or thermal conductivity.The alignment of noncontinuous,powder-like graphene layers in polymers has been challenging due to the low bending modulus of a few-or even single-layered graphene,which causes aggregations or folding behaviors.This research demonstrates the leveraging of polymer-nanoparticle interactions to align graphene nanoplatelets(GNPs)in the polyacrylonitrile(PAN)matrix.An in-house designed spinning method produces a three-layered fiber that utilizes the interfacial interactions between each layer for graphene alignment between graphitic layers.This composite containing oriented GNPs significantly improves modulus(i.e.,42.3 to 74.6 GPa)and increases electrical conductivity for enhancing volatile organic compounds(VOCs)sensing behaviors.This research opens up a new scalable fabrication method for multilayered composites. | Rahul Franklin Weiheng Xu Dharneedar Ravichandran Sayli Jambhulkar Yuxiang Zhu Kenan Song | 2021 | Journal of Materials Science & Technology2021，，36： | 0 |
| 3 | Continuouss Three-Dimensional Printing of Architected Piezoelectric Sensors in Minutes显示文摘Additive manufacturing(AM),also known as three-dimensional(3D)printing,is thriving as an effective and robust method in fabricating architected piezoelectric structures,yet most of the commonly adopted printing techniques often face the inherent speed-accuracy trade-off,limiting their speed in manufacturing sophisticated parts containing micro-/nanoscale features.Herein,stabilized,photo-curable resins comprising chemically functionalized piezoelectric nanoparticles(PiezoNPs)were formulated,from which microscale architected 3D piezoelectric structures were printed continuously via micro continuous liquid interface production(μCLIP)at speeds of up to~60μm s^(-1),which are more than 10 times faster than the previously reported stereolithography-based works.The 3D-printed functionalized barium titanate(f-BTO)composites reveal a bulk piezoelectric charge constant d33 of 27.70 pC N^(-1) with the 30 wt%f-BTO.Moreover,rationally designed lattice structures that manifested enhanced,tailorable piezoelectric sensing performance as well as mechanical flexibility were tested and explored in diverse flexible and wearable self-powered sensing applications,e.g.,motion recognition and respiratory monitoring. | SiyingLiu Wenbo Wang Weiheng Xu Luyang Liu Wenlong Zhang Kenan Song Xiangfan Chen | 2022 | Research2022，，4： | 0 |
| 4 | Cooperative control of perpendicular magnetic anisotropy via crystal structure and orientation in freestanding SrRuO_(3)membranes显示文摘Flexible magnetic materials with robust and controllable perpendicular magnetic anisotropy(PMA)are highly desirable for developing flexible high-performance spintronic devices.However,it is still challenge to fabricate PMA films on polymers directly.Here,we report a facile method for synthesizing single-crystal freestanding SrRuO_(3) membranes with controlled crystal structure and orientation using water-soluble Ca_(3-x)Sr_(x)Al_(2)O_(3)6 sacrificial layers.Through cooperative effect of crystal structure and orientation,flexible membranes reveal highly tunable magnetic anisotropy from in-plane to out-of-plane with a remarkable PMA energy of 7×10^(6) erg·cm^(−3).First-principle calculations reveal that the underlying mechanism of PMA modulation is intimately correlated with structure-controlled Ru 4d-orbital occupation,as well as spin-orbital matrix element differences,dependent on the crystal orientation.In addition,even after 10,000 bending cycles,the PMA keeps stable,indicating a robust magnetism reliability in the prepared films.This work provides a feasible approach to prepare the flexible oxide films with strong and controllable PMA. | Zengxing Lu Yongjie Yang Lijie Wen Jiatai Feng Bin Lao Xuan Zheng Sheng Li Kenan Zhao Bingshan Cao Zeliang Ren Dongsheng Song Haifeng Du Yuanyuan Guo Zhicheng Zhong Xianfeng Hao Zhiming Wang Run-Wei Li | 2022 | npj Flexible Electronics2022，6，1： | 0 |
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