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MORPHOLOGY EVOLUTION OF POLY(St-co-BuA)/SILICA NANOCOMPOSITE PARTICLES SYNTHESIZED BY EMULSION POLYMERIZATION

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Chinese Journal of Polymer Science 2006年第3期24卷 323-331页

作者： Hua Li 周树学 bo you Li-min Wu Department of Materials Science The Advanced Coatings Research Center of China Educational Ministry Fudan University Shanghai 200433 China Faculty of Chemistry and Materials Science Hubei University Wuhan 430062 China

Poly（St-co-BuA）/silica nanocomposite latexes were synthesized via conventional emulsion polymerization in the presence of 3-（trimethoxysilyl）propyl methacrylate modified colloidal nano-silica. The effects of surface property, particle size and content of colloidal nano-silica as well as the concentrations of monomer and surfactant on the morphology of nanocomposite latex particles were investigated by transmission electron microscope （TEM） and scanning electron microscope （SEM） in detail. Various interesting morphologies such as grape-like, Chinese gooseberry-like, pomegranate-like and normal core-shell structures were observed. Droplet nucleation mechanism competing with micelle nucleation mechanism was proposed to explain the morphological evolution of the nanocomposite particles.

关键词： Morphology Colloidal nano-silica Nanocomposite particle Emulsion polymerization.

NUMERICAL SIMULATION AND COMPARISON OF WATER INTAKE-OUTLET METHODS IN POWER PLANTS

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Journal of Hydrodynamics 2007年第5期19卷 623-629页

作者： CHENG you-liang YING bo-fen School of Energy and Power Engineering North China Electric Power University Baoding 071003 China

The eclipsed form arrangement and march-past method of water intake-outlet arrangements in power plants were researched by 3-D numerical simulation based on the k-e two-equation turbulence model. Firstly, the flowing characteristics of eclipsed form arrangement were analyzed and the effects of some main factors on inlet temperature were investigated. The simulation results are basically in agreement with those of the previous experiments. Then, by comparing the inlet temperature of the above two intake-outlet methods, the superiority and its existent conditions of the eclipsed form were examined.

关键词： method water simulation eclipsed form arrangement,intake-outlet inlet temperature,march-past numerical

Hybrid water electrolysis:Replacing oxygen evolution reaction for energy-efficient hydrogen production and beyond

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Materials Reports(Energy) 2021年第1期1卷 141-154页

作者： Lijie Du Yujie Sun bo you Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanHubei430074China Department of Chemistry University of CincinnatiCincinnatiOH45221USA

Renewable energy-driven hydrogen generation from water electrolysis has been widely recognized as a promising approach to utilize sustainable energy resources,reduce our dependence on legacy fossil fuels and alleviate net carbon dioxide ***,conventional water electrolyzers suffer from the high overpotentials,mainly due to the sluggish kinetics of anodic oxygen evolution reaction(OER).This reaction also generates reactive oxygen species that could degrade the proton exchange membrane and oxygen that may mix with the cathodic hydrogen to form explosive gaseous *** address these issues,an innovative hybrid water electrolysis strategy which involves a certain alternative oxidation reaction to replace OER has been developed,and has led to a burgeoning area that sparks much research interest in finding available alternative reactions and their corresponding ***,we summarize the alternative reactions into three groups:(1)the reagentsacrificing type that can generate H2 with an ultra-low potential while the substrates are oxidized to valueless products;(2)the pollutant-degrading type at which environmental pollutants are used as substrates;(3)the valueadded type that produces valuable products at the *** and electrolyzer designs for hybrid electrolysis are also briefly discussed,with an emphasis on the catalyst reconstruction ***,the present challenges and perspectives are put forward.

关键词： Hybrid water splitting Electrocatalysis Hydrogen evolution Organic oxidation

Stabilized quantum coherence and remote state preparation in structured environments

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Chinese Science Bulletin 2014年第29期59卷 3841-3846页

作者： Ping Zhang bo you Li-Xiang Cen Center of Theoretical Physics College of Physical Science and TechnologySichuan University

The radiation decay of a two-level atom could be inhibited within structured environments even under longtime *** investigate the stabilized quantum coherence of composite systems undergoing local dissipation and exploit it further as a resource for remote state *** focus on outputs of quantum states with solely quantum discord(i.e.,without entanglement)and demonstrate that they could be resulted from various initial states providing specific spectral structure of the *** detail,we elaborate the behavior of stabilized quantum discord and the corresponding fidelity for remote state preparation in connection with structural spectra of Ohmic class reservoir and of photonic band gap mediums.

关键词：远程态制备量子相干性结构化环境稳定初始状态二能级原子复合系统储层结构

Physiological responses of people in working faces of deep underground mines

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International Journal of Mining Science and Technology 2014年第5期24卷 683-688页

作者： you bo Wu Chao Li Ji Liao Huimin School of Resources and Safety Engineering Central South University School of Energy & Safety Engineering Hunan University of Science & Technology Changsha Institute of Mining Research Co. Ltd.

The research studied the influences of high temperature, high pressure, high humidity, noise and other harmful factors in mining conditions on the people health and safety, and investigated the impacts of confined environmental on human physiology factors, including temperature, humidity, noise, pressure,toxic and harmful gases in terms of environmental characteristics in underground mines and an artificial intelligence system for simulation of the environment in a confined space of deep mines. Our results show that the systolic pressure, diastolic pressure, mean pressure, heart rate, respiratory rate, typing test speed and memory level percentage are negatively correlated with temperature value, and positively correlated with humidity value; the human temperature and weight are positively correlated with temperature value, and negatively correlated with humidity value. This research lays the foundation for the study of interaction between the deep confined space environment and safety behavior.

关键词： Deep mine Confined space High temperature and high humidity Simulation experiment Human physiological index

A boundary surrogate model for micro/nano grooved surface structure applied in turbulence flow control over airfoil

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Chinese Journal of Aeronautics 2022年第2期35卷 62-73页

作者： Liyue WANG Cong WANG Shuyue WANG Sheng QIN Gang SUN bo you Yongjian ZHONG Department of Aeronautics&Astronautics Fudan UniversityShanghai 200433China Department of Material Science Fudan UniversityShanghai 200433China AECC Commercial Aircraft Engine Co. Ltd.Shanghai 200241China

The application of grooved surface structure is an emerging and effective means in turbulence flow ***,for a realistic configuration,the global flow field described directly by simple application of massive grids makes it unfeasible to *** this paper,a boundary surrogate model reproducing the effect of microscopic near-wall region is proposed to improve computational *** surrogate model trained with Lattice boltzmann Method(LBM)considering the rarefied effect based on real micro/nanoflow field is new among literature,which accurately shows flow characteristics of the micro/nano *** this approach,numerical simulations via Reynolds-averaged Navier Stokes equations with modified wall boundary condition are performed in subsonic and transonic *** results show that micro/nano grooved surface structure has the effect of delaying transition from laminar to turbulence,thus reducing the skin friction *** of turbulence intensity and turbulence kinetic energy shows that the near-wall flow field of grooved airfoil is more stable compared with that of the smooth *** reducing rate of maximum turbulent intensity reaches 13.39%.The paper shows a perspective for further application of micro/nano groove structure to turbulence flow control in aircraft design by providing an accurate and efficient simulation method.

关键词： boundary modeling CFD Drag reduction Flow control Microstructure

An innovative study on low surface energy micronano coatings with multilevel structures for laminar flow design

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Chinese Journal of Aeronautics 2019年第3期32卷 577-584页

作者： Jun TAO Gang SUN Gang WU Liqiang GUO Yongjian ZHONG Meng WANG bo you Department of Aeronautics & Astronautics Fudan University Department of Mechanical & Aerospace Engineering University of CaliforniaIrvine Department of Material Science Fudan University AECC Commercial Aircraft Engine Co. Ltd. AVIC Aerodynamics Research Institute

Laminar flow design is one of the most effective ways to reduce the drag of a commercial aircraft by expanding the laminar flow region on the surface of the aircraft. As material science develops, the emergence of new materials such as low surface energy materials has offered new choices for laminar flow design of commercial aircraft. Different types of low surface energy micro-nano coatings are prepared to verify the effects on the boundary layer transition position and the drag of the airfoil through wind tunnel tests. The infrared thermal imaging technology is adopted for measuring the boundary layer transition, while the momentum integral approach is employed to measure the drag coefficient through a wake rake. Infrared thermal imaging results indicate that the coatings are capable of moving backward the boundary layer transition position at both a low velocity of Mach number 0.15 and a high velocity of Mach number 0.785. Results of the momentum integral approach demonstrate that the drag coefficients are reduced obviously within the cruising angle of attack range from 1° and 5° by introducing the low surface energy micro-nano coating technology.

关键词： Coating techniques Drag reduction Laminar flow Surface energy Wind tunnel test

Preliminary studies of constructing a tissue-engineered lamellar corneal graft by culturing mesenchymal stem cells onto decellularized corneal matrix

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International Journal of Ophthalmology(English edition) 2021年第1期14卷 10-18页

作者： Yu-Jie Cen De-bo you Wei Wang Yun Feng Department of Ophthalmology Peking University Third HospitalBeijing 100191China Beijing Key Laboratory of Restoration of Damaged Ocular Nerve Peking University Third HospitalBeijing 100191China

AIM:To construct a competent corneal lamellar substitute in order to alleviate the shortage of human corneal ***:Rabbit mesenchymal stem cells(MSCs)were isolated from bone marrow and identified by flow cytometric,osteogenic and adipogenic *** decellularized corneal matrix(XDCM)was generated from dog *** were seeded and cultured on XDCM to construct the tissueengineered ***-transplantation biocompatibility of engineered corneal graft were tested by animal *** were divided into two groups then underwent lamellar keratoplasty(LK)with different corneal grafts:1)XDCM group(n=5):XDCM;2)XDCM-MSCs groups(n=4):tissue-engineered cornea made up with XDCM and *** ocular surface recovery procedure was observed while corneal transparency,neovascularization and epithelium defection were measured and *** vivo on focal exam was performed 3 mo ***:Rabbit MSCs were isolated and *** cytometry demonstrated isolated cells were CD90 positive and CD34,CD45 *** and adipogenic induction verified their multipotent ***-XDCM grafts were constructed and *** vivo transplantation showed the neovascularization in XDCMMSC group was much less than that in XDCM group ***-transplant 3-month confocal test showed less nerve regeneration and bigger cell-absent area in XDCM-MSC ***:This study present a novel corneal tissue-engineered graft that could reduce post-operatively neovascularization and remain transparency,meanwhile shows that co-transplantation of MSCs may help increase corneal transplantation successful rate and enlarge the source range of corneal substitute to overcome cornea donor shortage.

关键词： mesenchymal stem cells xenogenic decellularized corneal matrix acellular corneal matrix neovascularization tissue-engineered cornea

Improving Impact Toughness of Polylactide/Ethylene-co-vinyl-acetate Blends via Adding Fumed Silica Nanoparticles:Effects of Specific Surface Area-dependent Interfacial Selective Distribution of Silica

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Chinese Journal of Polymer Science 2021年第8期39卷 1040-1049,I0008页

作者： Ting-Ting Zhang Mei-Xi Zhou Zhen-you Guo you-bo Zhao Di Han Hao Xiu Hong-Wei Bai Qin Zhang Qiang Fu College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

Adding fumed silica(Si0_(2))has been considered as an effective method for tailoring the phase morphology and performance of elastomer-toughened plastic binary *** has been demonstrated that the selective distribution of SiO_(2) plays a decisive role in the mechanical properties of plastic/elastomer/SiO_(2)nanocomposites,especially for the impact *** this work,we aim to illuminate the role of specific surface area in controlling their selective distribution of fumed SiO_(2) and consequent mechanical properties of plastic/elastomer binary *** types of SiO_(2) with different specific surface areas were incorporated into polylactide/ethylene-co-vinyl-acetate(PLA/EVA)model blends by melt blending *** was found that the selective distribution of SiO_(2) is largely determined by their specific surface areas,***_(2) nanoparticles with low specific surface area has a stronger tendency to be located at the interface between PLA matrix and EVA dispersed phase as compared to those with high specific surface *** specific surface area-dependent interfacial selective distribution of SiO_(2) is mainly attributed to the extent of increased viscosity of EVA dispersed phase in which SiO_(2)nanoparticles are initially dispersed and resultant migration rate of SiO_(2) *** interfacial localized SiO_(2) nanoparticles induce an obvious enhancement in the impact toughness with strength and modulus well *** importantly,in the case of the same interfacial distribution,toughening efficiency is increased with the specific surface area of SiO_(2).Therefore,this is an optimum specific surface area of SiO_(2) for the *** work not only provides a novel way to manipulate the selective distribution of SiO_(2) in elastomer-toughened plastic blends toward high-performance,but also gives a deep insight into the role of interfacial localized nanoparticles in the toughening mechanism.

关键词： Fumed silica Specific surface area Selective distribution Polylactide Impact toughness