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Simulations of Tapered Channel in Multilayer Graphene as Reverse Osmosis Membrane for Desalination

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 314-323页

作者： WANG Tianzhen CHEN Bo SHAO Xingyu zheng huai HU Xuejiao JIANG Haifeng Key Laboratory of Hydraulic Machinery Transients(Wuhan University) Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China Research Institute of Tsinghua University in Shenzhen Shenzhen 518071China

Pressure-driven reverse osmosis membrane has important application in seawater *** by the structure of aquaporin,we established and studied the mechanism of the structure of multilayer graphene with tapered channels as reverse *** water flux of multilayer graphene with tapered channels was about 20%higher than that of parallel graphene *** flow resistance model was established,and the relationship between flow resistance and opening angles was *** relationship between flow resistance and outlet size was also *** means of molecular dynamics simulation,slip coefficients of multilayer graphene with tapered channel were obtained and verified by the contact angle of *** show that the permeability of graphene with tapered channel is about three orders of magnitude higher than that of commercial reverse osmosis membrane and the desalination rate is 100%.Temperature difference between the two sides of the tapered channel will promote the water flux positively.

关键词： multilayer graphene molecular dynamics tapered channel opening angles reverse osmosis

Revolutionizing plasmonic platform via magnetic field-assisted confined ultrafast laser deposition of high-density,uniform,and ultrafine nanoparticle arrays

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International Journal of Extreme Manufacturing 2024年第3期6卷 428-438页

作者： Jin Xu Lingfeng Wang Peilin Yang Haoqing Jiang huai zheng Licong An Xingtao Liu Gary J Cheng School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906United States of America Institute of Technological Sciences Wuhan UniversityWuhanHubei 430072People’s Republic of China

The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant ***,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their *** address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in *** precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)*** profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and *** the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering *** enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)***,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of ***,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS *** study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy *** outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,ph

关键词： magnetic field manipulation laser deposition metasurface SERS

Advances in multi-scale design and fabrication processes for thick electrodes in lithium-ion batteries

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Energy Reviews 2024年第2期3卷 14-30页

作者： Xiuxue Liu Yubin Zeng Wei Yuan Guanhua Zhang huai zheng Zhongxue Chen Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan430072China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640GuangdongChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou511300China

In the contemporary era,lithium-ion batteries have gained considerable attention in various industries such as 3C products,electric vehicles and energy storage systems due to their exceptional *** the rapid progress in the energy storage sector,there is a growing demand for greater energy density in lithium-ion *** the use of thick electrodes is a straightforward and effective approach to enhance the energy density of battery,it is hindered by the sluggish reaction dynamics and insufficient mechanical ***,we comprehensively review recent advances in the field of thick electrodes for lithium-ion batteries to overcome the bottlenecks in the development of thick electrodes and achieve efficient fabrication for high-performance lithium-ion ***,a systematic analysis is performed to identify the factors affecting the performance of the thick *** correlation between electrode materials,structural parameters,and performance is also ***,the viable strategies for constructing thick electrodes with improved properties are summarize,including high throughput,high conductivity and low tortuosity,in both material development and structural *** addition,recent advances in efficient fabrication methods for thick electrode fabrication are reviewed,with a comprehensive assessment of their merits,limitations,and applicable ***,a comprehensive overview of the multiscale design and manufacturing process for thick electrodes in lithium-ion batteries is provided,accompanied by valuable insights into design considerations that are crucial for future advances in this area.

关键词： Lithium-ion battery Thick electrode High energy density Electrode structure Multi-scale design Material development

Optical constants study of YAG：Ce phosphor layer blended with SiO2 particles by Mie theory for white light-emitting diode package

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Frontiers of Optoelectronics 2012年第2期5卷 138-146页

作者： Run HU Xiaobing LUO huai zheng Sheng LIU School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Optical constants, including scattering coefficient, absorption coefficient, asymmetry parameter and reduced scattering coefficient, of cerium-doped yttrium aluminium garnets （YAG：Ce） phosphor blended with SiO2 particle for white light-emitting diode （LED） packages were calculated based on Mie theory in this study. Calculation processes were presented in detail. Variations of the optical constants with the changes of phosphor weight fraction, dopant weight fraction, phosphor particle radius and SiO2 particle radius, were shown and analyzed separately. It was found that the asymmetry parameter is the intrinsic characteristic of the particles, and the increase of the phosphor weight fraction （or concentration） will lead to the increase of the optical constants. It was also discovered that the increase of the dopant weight fraction will enhance the scattering coefficient, but result in the decreases of the reduced scattering coefficient and the absorption coefficient.

关键词： Mie theory phosphor optical constant light-emitting diode (LED)

Effects of packaging structure on optical performances of phosphor converted light emitting diodes

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Frontiers of Optoelectronics 2012年第2期5卷 153-156页

作者： Xing FU huai zheng Sheng LIU Xiaobing LUO School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Division of MoEMS Wuhan National Laboratory for OptoelectronicsWuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Effects of tilt angles of reflective cup structure and phosphor surface geometries on light extraction efficiency and angular color uniformity （ACU） of phosphor converted light emitting diodes （pcLED） are investigated by Monte Carlo ray-tracing simulations. It is found that tilt angles of reflective cup and phosphor surface geometries affect the light extraction efficiency and the ACU distinctly. When the tilt angle varied from 60° to 15°, the light extraction efficiency of LED can achieve the improvements of 13.87%, 18.25% and 14.79% respectively, when the phosphor surface geometry is concave, flat and convex, respectively. It is also found the variety law of phosphor concentrations with the change of tilt angles and phosphor surface geometries to maintain a fixed correlated color temperature （CCT）.

关键词： phosphor packaging structure reflective cup,light emitting diodes (LEDs)

Programmable droplet manipulation enabled by charged-surface pattern reconfiguration

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Droplet 2023年第3期2卷 99-109页

作者： Duokui Fang Wenhao Zhou Yuankai Jin Xiaofeng Liu Yubin Zeng Zuankai Wang huai zheng Key Laboratory of Transients in Hydraulic Machinery Ministry of EducationWuhan UniversityWuhanChina School of Power and Mechanical Engineering Wuhan UniversityWuhanChina Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Programmable droplet manipulation based on external stimulation is in high demand in various modern *** notable progress,current manipulation strategies still suffer from a common drawback such as single control means of modulating the external stimulation input,which leads to huge challenges in sophisticated and large scale-up droplet ***,a unique patternreconfiguration-driven droplet manipulation method is developed on conductive/nonconductive pattern surfaces under charge *** charge deposition induces the“edge barrier”phenomenon at the boundaries of conductive/nonconductive patterns,analogous to an invisible and tunable wall guiding droplet *** edge barrier effect can be flexibly tuned by the nonconductive surface ***,with charge deposition,surfaces are endowed with protean control *** design of conductive/nonconductive patterns can effectively enable multifunction droplet manipulations,including track-guided sliding,sorting,merging,and ***,dynamical pattern reconfiguration drives programmable fluidics with sophisticated and large scale-up droplet handling capabilities in a low-cost and simple approach.

关键词： figuration analogous endowed

A V_(2)O_(3)@N-C cathode material for aqueous zinc-ion batteries with boosted zinc-ion storage performance

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Rare Metals 2022年第5期41卷 1605-1615页

作者： huai-zheng Ren Jian Zhang Bo Wang Hao Luo Fan Jin Tian-Ren Zhang An Ding Bo-Wen Cong Dian-Long Wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Urban Water Resource and EnvironmentSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Tianneng Group Changxing 313100China

The discontinuity of new types of clean energy,such as wind power and solar cells, has promoted the development of large-scale energy storage systems(EES).Rechargeable aqueous zinc-ion batteries(ZIBs) have received extensive attention due to their inherent safety and low cost. At this stage, the performance of ZIBs is still limited by cathode materials. In this work, we have constructed a ZIBs cathode material-V_(2)O_(3)@N–C, through surface coating and N atom doping. The N-doped carbon coating endows V_(2)O_(3)@N–C with excellent structural stability and enhances its electrical conductivity. As a result,V_(2)O_(3)@N–C cathode delivers exceptional reversible of Zn^(2+) intercalation/deintercalation. The fabricated Zn/V_(2)O_(3)@N–C batteries exhibit high capacity of 274.6 mAh·g^(-1) at 5 A·g^(-1) and excellent capacity retention of 94% after 2000 cycles. The reversible intercalation/deintercalation of Zn^(2+) in the V_(2)O_(3)@N–C cathode is proved by ex-situ testing methods. It is believed that this work should inject new vitality into the development of ZIBs cathode.

关键词： Zinc-ion batteries V_(2)O_(3)@N-C cathode Structural design Carbon layer N atom doping

黄酮配合物抗自由基活性的亚甲基蓝光谱测定体系的研究

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光谱学与光谱分析 2006年第12期26卷 2294-2297页

作者：李方郑怀礼四川大学化学学院四川成都610064 重庆大学化学化工学院重庆400044

亚甲基蓝(MB)可捕获Fenton反应产生的羟自由基生成无色加合物,选用亚甲基蓝为槲皮素(Que)及其配合物抗羟自由基活性测定体系的指示剂。实验优化测试条件为:体系pH 8.0,加入H2O2溶液(0.3%)0.50 mL,FeSO4溶液(5 mmol.L-1)0.50 mL和MB溶液(... 详细信息

亚甲基蓝(MB)可捕获Fenton反应产生的羟自由基生成无色加合物,选用亚甲基蓝为槲皮素(Que)及其配合物抗羟自由基活性测定体系的指示剂。实验优化测试条件为:体系pH 8.0,加入H2O2溶液(0.3%)0.50 mL,FeSO4溶液(5 mmol.L-1)0.50 mL和MB溶液(2.56×10-5mol.L-1)1.0 mL。由此建立了测定槲皮素配合物抗.OH活性的光谱测定方法。方法简便,尤其适合于配合物体系抗自由基活性的分析。测定了槲皮素及Que-Zn(Ⅱ),Que-Cu(Ⅱ),Que-Fe(Ⅲ)配合物的抗.OH活性。结果表明3种槲皮素配合物的抗羟自由基活性均比槲皮素高,配合物活性Que-Cu(Ⅱ)>Que-Zn(Ⅱ)>Que-Fe(Ⅲ),表现出金属离子与有机活性配体协同作用可提高其抗氧化活性的能力。

关键词：亚甲基蓝光谱法槲皮素配合物羟自由基

Changes of Serum Follicular Stimulating Hormone,Luteinizing Hormone and Follicular Sizes duringElectroacupuncture for Induction of Ovulation

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Chinese Journal of Integrative Medicine 1995年第2期1卷 13-16页

作者： Yu Jin (俞瑾) zheng huai-mei (郑怀美) and Bing Sheng-min (邴圣民)(Obstetrical and Gynecological Hospital, Shanghai Medical UniversityShanghai) (200011) Obstetrical and Gynecological Hospital Shanghai Medical University Shanghai

Changes in follicular stimulating hormone (FSH) . luteinizing hormone (LH) and follicularsizes were observed in 10 patients with chronic anovulation during electroacupuncture treatment. Sevencases were diagnosed as suffering from polycystic ovary syndrome, 2 from dysfunctional uterine bleeding,and 1 from hypogonadotropic amenorrhea. Among them 8 cases complained of infertility for an average of2. 7years. Ovulation was confirmed by pregnancy or the combination of biphasic basal body temperatureand ultrasonographic signs. During one course of 3 consecutive days of electroacupuncture treatment onacupoints Guanyuan (Ren 4), Zhongji (Ren 3), Zigong (Extra 16) and Sanyingjiao (SP 6). ovulation re-sulted in 5 patients (ovulating group) and 3 of the 4 infertile women became pregnant. Five cases failed toovulate (non-ovulating group) , 3 of them reached a biphasic basal body temperature without ovulatorysigns on ultrasonograph. Serum FSH, LH values and FSH pulse frequency increased significantly during-electroacupuncture treatment in the ovulating group (from 2. 10±0. 42 pulses/4h to 3. 70±1. 64 pulses/4h), but not in the non-ovulating group. No apparent change was found in LH pulse frequency, or in pulseamplitudes for FSH and LH. In the ovulating group, diameters of ovarian follicules markedly increased,but their growth was limited in the non-ovulation group. The results suggest ovulation may be induced byelectroacupuncture via a regulation on the hypothalamic-pituitary function, leading to normal secretion ofFSH and LH.

关键词： electroacupuncture treatment. pulsatile secretion ovarian follicle follicular stimulatinghormone. Iuteinizing hormone ovufation