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On-Chip Micro Temperature Controllers Based on Freestanding Thermoelectric Nano Films for Low-Power Electronics
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作者 Qun Jin Tianxiao Guo +4 位作者 Nicolas Perez Nianjun Yang Xin Jiang Kornelius Nielsch Heiko Reith 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第7期98-108,共11页
Multidimensional integration and multifunctional com-ponent assembly have been greatly explored in recent years to extend Moore’s Law of modern microelectronics.However,this inevitably exac-erbates the inhomogeneity ... Multidimensional integration and multifunctional com-ponent assembly have been greatly explored in recent years to extend Moore’s Law of modern microelectronics.However,this inevitably exac-erbates the inhomogeneity of temperature distribution in microsystems,making precise temperature control for electronic components extremely challenging.Herein,we report an on-chip micro temperature controller including a pair of thermoelectric legs with a total area of 50×50μm^(2),which are fabricated from dense and flat freestanding Bi2Te3-based ther-moelectric nano films deposited on a newly developed nano graphene oxide membrane substrate.Its tunable equivalent thermal resistance is controlled by electrical currents to achieve energy-efficient temperature control for low-power electronics.A large cooling temperature difference of 44.5 K at 380 K is achieved with a power consumption of only 445μW,resulting in an ultrahigh temperature control capability over 100 K mW^(-1).Moreover,an ultra-fast cooling rate exceeding 2000 K s^(-1) and excellent reliability of up to 1 million cycles are observed.Our proposed on-chip temperature controller is expected to enable further miniaturization and multifunctional integration on a single chip for microelectronics. 展开更多
关键词 Temperature control Low-power electronics On-chip micro temperature controller Freestanding thermoelectric nano films Temperature-sensitive components
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Active Micro-Nano-Collaborative Bioelectronic Device for Advanced Electrophysiological Recording
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作者 Yuting Xiang Keda Shi +7 位作者 Ying Li Jiajin Xue Zhicheng Tong Huiming Li Zhongjun Li Chong Teng Jiaru Fang Ning Hu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第7期244-264,共21页
The development of precise and sensitive electrophysiological recording platforms holds the utmost importance for research in the fields of cardiology and neuroscience.In recent years,active micro/nano-bioelectronic d... The development of precise and sensitive electrophysiological recording platforms holds the utmost importance for research in the fields of cardiology and neuroscience.In recent years,active micro/nano-bioelectronic devices have undergone significant advancements,thereby facilitating the study of electrophysiology.The distinctive configuration and exceptional functionality of these active micro-nano-collaborative bioelectronic devices offer the potential for the recording of high-fidelity action potential signals on a large scale.In this paper,we review three-dimensional active nano-transistors and planar active micro-transistors in terms of their applications in electroexcitable cells,focusing on the evaluation of the effects of active micro/nano-bioelectronic devices on electrophysiological signals.Looking forward to the possibilities,challenges,and wide prospects of active micro-nano-devices,we expect to advance their progress to satisfy the demands of theoretical investigations and medical implementations within the domains of cardiology and neuroscience research. 展开更多
关键词 Active micro/nano collaborative bioelectronic device Three-dimensional active nano-transistor Planar active microtransistor ELECTROPHYSIOLOGY
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Ignition processes and characteristics of charring conductive polymers with a cavity geometry in precombustion chamber for applications in micro/nano satellite hybrid rocket motors
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作者 Zhiyuan Zhang Hanyu Deng +2 位作者 Wenhe Liao Bin Yu Zai Yu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第2期55-66,共12页
The arc ignition system based on charring polymers has advantages of simple structure,low ignition power consumption and multiple ignitions,which bringing it broadly application prospect in hybrid propulsion system of... The arc ignition system based on charring polymers has advantages of simple structure,low ignition power consumption and multiple ignitions,which bringing it broadly application prospect in hybrid propulsion system of micro/nano satellite.However,charring polymers alone need a relatively high input voltage to achieve pyrolysis and ignition,which increases the burden and cost of the power system of micro/nano satellite in practical application.Adding conductive substance into charring polymers can effectively decrease the conducting voltage which can realize low voltage and low power consumption repeated ignition of arc ignition system.In this paper,a charring conductive polymer ignition grain with a cavity geometry in precombustion chamber,which is composed of PLA and multiwall carbon nanotubes(MWCNT)was proposed.The detailed ignition processes were analyzed and two different ignition mechanisms in the cavity of charring conductive polymers were revealed.The ignition characteristics of charring conductive polymers were also investigated at different input voltages,ignition grain structures,ignition locations and injection schemes in a visual ignition combustor.The results demonstrated that the ignition delay and external energy required for ignition were inversely correlated with the voltages applied to ignition grain.Moreover,the incremental depth of cavity shortened the ignition delay and external energy required for ignition while accelerated the propagation of flame.As the depth of cavity increased from 2 to 6 mm(at 50 V),the time of flame propagating out of ignition grain changed from 235.6 to 108 ms,and values of mean ignition delay time and mean external energy required for ignition decreased from 462.8 to 320 ms and 16.2 to 10.75 J,respectively.The rear side of the cavity was the ideal ignition position which had a shorter ignition delay and a faster flame propagation speed in comparison to other ignition positions.Compared to direct injection scheme,swirling injection provided a more favorable flow field environment in the cavity,which was beneficial to ignition and initial flame propagation,but the ignition position needed to be away from the outlet of swirling injector.At last,the repeated ignition characteristic of charring conductive polymers was also investigated.The ignition delay time and external energy required for ignition decreased with repeated ignition times but the variation was decreasing gradually. 展开更多
关键词 micro/nano satellite hybrid propulsion Arc ignition Charring conductive polymer Ignition mechanism Ignition characteristic Repeated ignition
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Impacts of Micro- and Nano-Plastics on Soil Properties and Plant Production in Agroecosystems: A Mini-Review
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作者 Dafeng Hui Faisal Hayat +1 位作者 Muhammad Salam Prabodh Illukpitiya 《Agricultural Sciences》 2024年第10期1089-1111,共23页
Micro- and nano-plastics (MNPs) are tiny plastic particles resulting from plastic product degradation. Soil MNPs have been identified as potential influential factors affecting various soil properties and crop biomass... Micro- and nano-plastics (MNPs) are tiny plastic particles resulting from plastic product degradation. Soil MNPs have been identified as potential influential factors affecting various soil properties and crop biomass productivity. This mini-review provides a synthesis of recent findings concerning their effects on soil physicochemical properties, microorganisms, organic carbon content, soil nutrients, greenhouse gas emissions, soil fauna, and their impacts on plant ecophysiology, growth, and production. The results indicate that MNPs may markedly impede soil aggregation ability, increase porosity, decrease soil bulk density, enhance water retention capacity, influence soil pH and electrical conductivity, and escalate soil water evaporation. Exposure to MNPs may predominantly induce changes in soil microbial composition, reducing the diversity and complexity of microbial communities and microbial activity while enhancing soil organic carbon stability, influencing soil nutrient dynamics, and stimulating organic carbon decomposition and denitrification processes, leading to elevated soil respiration and methane emissions, and potentially decreasing soil nitrous oxide emission. Additionally, MNPs may adversely affect soil fauna, diminish seed germination rates, promote plant root growth, yet impair plant photosynthetic efficacy and biomass productivity. These findings contribute to a better understanding of the impacts and mechanistic foundations of MNPs. Future research avenues are suggested to further explore the impacts and economic implications. 展开更多
关键词 Soil Property micro- and nano-Plastics Crop Yield Soil microorganism Soil Fauna Soil Greenhouse Gas Emissions
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Tribological characteristics of micro or nano particles between the gear pairs 被引量:1
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作者 WANG Ze-gui XIE Xiao-peng 《工程设计学报》 CSCD 北大核心 2007年第4期342-346,共5页
将4种分别含有微米或纳米固体粒子的磨合油应用在45号钢齿轮副磨合试验中,研究这2类粒子对齿轮磨合的影响及行为.研究中使用的2种微米粒子分别是平均粒径为10μm的碳酸钙和100μm的石英砂,2种纳米粒子分别是平均粒径为5nm的金刚石和3... 将4种分别含有微米或纳米固体粒子的磨合油应用在45号钢齿轮副磨合试验中,研究这2类粒子对齿轮磨合的影响及行为.研究中使用的2种微米粒子分别是平均粒径为10μm的碳酸钙和100μm的石英砂,2种纳米粒子分别是平均粒径为5nm的金刚石和30nm的导电炭黑,大齿轮和小齿轮未磨合前的齿面三维粗糙度分别是24.00μm和32.97μm.试验结果表明:微米粒子对磨合磨损的主要影响表现为磨粒磨损,且微粒的粒径越大,磨粒磨损越剧烈;纳米粒子对磨合磨损影响不大,但纳米粒子能够吸附、填充和渗入齿面,从而改观齿面形貌和改善齿面摩擦学性能.另外,在含有这2类粒子的磨合磨损中,摩擦副间都有不同程度的“负电阻”现象发生,且两齿轮的磨损率蒡越大,该电现象越明显. 展开更多
关键词 摩擦特性 齿轮副 微小质粒 纳米粒子 磨合
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Microstructure and Oxidation Behaviors of Nano-particles Strengthened NiCoCrAlY Cladded Coatings on Superalloys 被引量:12
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作者 WANG Hongyu ZUO Dunwen +2 位作者 CHEN Xinfeng YU Shouxin GU Yuanzhi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2010年第3期297-304,共8页
Nano-particles which can largely improve the microstructure and oxidation resistance of materials are often used as a strengthening component in metal matrix composites. However, few studies were reported on its appli... Nano-particles which can largely improve the microstructure and oxidation resistance of materials are often used as a strengthening component in metal matrix composites. However, few studies were reported on its application in the bond coat of duplex structure thermal barrier coating(TBC). Three kinds of NiCoCrAlY coatings strengthened by different nano-particles with the same addition (1%, mass fraction) were prepared by the laser cladding technique on Ni-based superalloy substrates, aiming to study the effects of the nano-particles on microstructure and oxidation resistance of NiCoCrAlY coatings (the bond coat of the duplex structure thermal barrier coatings). Scanning electron microscope (SEM), X-ray diffractometer(XRD) and thermogravimetry were employed to investigate their morphologies, phases and cyclic oxidation behaviors in atmosphere at 1 050℃, compared with the coating without nano-particles. With the addition of nano-particles, the growth pattern of the grains at the interface changed from epitaxial growth to non-epitaxial growth or part-epitaxial growth; slender dendrites were broken and cellularized; cracks and pores were restrained; and the oxidation weight-gain and the stripping resistance of the oxide scale were improved as well. Among the three kinds of nano-particles, the SiC nano-particles showed the most improvement on microstructure, while the CeO2 nano-particles were insufficient, but its effects on the oxidation resistance are the same as those of the SiC nano-particles. Based on the discussions of the influence mechanism, it is believed that CeO2 nano-particles would show better improvement than SiC nano-particles if the proper amount is added and the proper preparation technique of micro-nanometer composite powders is adopted, with the synergistic action of nanometer effect and reactive element effect. 展开更多
关键词 high-temperature protective coating nano-particlE microSTRUCTURE cyclic oxidation laser cladding
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Lubrication Mechanism of Micro/Nano-particles on Sialon
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作者 张文光 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第B10期5-7,共3页
The tribological properties of Sialon sliding against AISI52100 steel ball under the lubrication of solid particle additives, as micro-borate particle and nano-PbS particle, were evaluated by a SRV ball-on-disc test r... The tribological properties of Sialon sliding against AISI52100 steel ball under the lubrication of solid particle additives, as micro-borate particle and nano-PbS particle, were evaluated by a SRV ball-on-disc test rig. The chemical composition of the worn surface was characterized by X-ray photoelectron spectroscopy (XPS). The morphologies of the worn surfaces of Sialon were analyzed by scanning electron microscopy (SEM). The results show that the particles can reduce the friction coefficient of the pairs and the wear volume of Sialon significantly. The wear resistance of micro-borate is superior to that of nano-PbS while the friction-reducing ability of PbS is better than that of borate. According to the XPS and SEM results, the wear resistance of PbS is mainly depended on the tribochemical film mainly composed of PbSO 4, which deposited on the worn surface with good bonding strength. No tribochemical reaction or deposited film was detected or observed on the worn surface of Sialon under the lubrication of borate, indicating that the possible physically deposited film generated from micro particle can also greatly reduce the wear volume of Sialon, though the friction reducing ability of which is inferior to that of nano PbS particle. 展开更多
关键词 sialon ceramic micro/nano-particle ADDITIVE lubrication mechanism
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Microwave absorbing properties of La_(0.8)Ba_(0.2)MnO_3 nano-particles
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作者 周克省 邓建杰 +2 位作者 尹荔松 马诗宏 高松华 《中国有色金属学会会刊:英文版》 EI CSCD 2007年第5期947-950,共4页
La0.8Ba0.2MnO3 nano-particles were synthesized by sol-gel process, and the crystal structure and morphology were characterized by XRD and SEM, respectively. The complex permittivity and permeability were determined by... La0.8Ba0.2MnO3 nano-particles were synthesized by sol-gel process, and the crystal structure and morphology were characterized by XRD and SEM, respectively. The complex permittivity and permeability were determined by microwave vector network analyzer in the frequency range of 2-18 GHz. The relationship between reflection coefficient and microwave frequency of La0.8Ba0.2 MnO3 was calculated based on measured data. The results show that the average diameter of La0.8Ba0.2MnO3 crystal powders is about 80 nm and the crystal structure is perovskite when being calcined at 800 ℃ for 2 h. The microwave absorbing peak is 13 dB at 6.7 GHz and the effective absorbing bandwidth above 10 dB reaches 1.8 GHz for the sample with the thickness of 2.6 mm. The microwave absorption can be attributed to both the dielectric loss and the magnetic loss from the loss tangents of the sample, but the former is greater than the latter. 展开更多
关键词 微波吸引材料 微粒物 La0.8Ba0.2MnO3 毫米
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Preparation, Structures Nano TiO_2 Particles, and the properties of TiH_2 Coated with Nano TiO_2 被引量:3
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作者 王怡红 赵军 +1 位作者 邹萍 何德坪 《Journal of Southeast University(English Edition)》 EI CAS 1999年第2期88-91,共4页
The surface of Titanium Hydride (TiH 2) is coated by Nano Titanium Dioxide (TiO 2) particles prepared in both of methods of hydrolysis reaction of Ti(OC 4H 9) 4 and base precipitation reaction of Ti(SO 4) 2. ... The surface of Titanium Hydride (TiH 2) is coated by Nano Titanium Dioxide (TiO 2) particles prepared in both of methods of hydrolysis reaction of Ti(OC 4H 9) 4 and base precipitation reaction of Ti(SO 4) 2. TiH 2 coated with nano TiO 2 particles, in which there is an oxidation film on its surface, shown in the experiments, will obviously achieve good effects on releasing hydrogen slowly in high temperature. There are different structures and properties of TiH 2 coated by nano TiO 2 particles prepared in different ways in high temperature, which can influence on releasing hydrogen. 展开更多
关键词 nano TiO_2 particles COATING TiH_2
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Effect of Aluminum Nano-Particles on Microrelief and Dielectric Properties of PE+TlInSe<sub>2</sub>Composite Materials
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作者 E. M. Gojayev Kh. R. Ahmadova +2 位作者 S. I. Safarova G. S. Djafarova Sh. M. Mextiyeva 《Open Journal of Inorganic Non》 2015年第1期11-19,共9页
The paper presents the results of studies surface microrelief, frequency-temperature characteristics of the imaginary part of the dielectric permittivity and dielectric loss of PE+TlInSe2 composite materials in 25。C ... The paper presents the results of studies surface microrelief, frequency-temperature characteristics of the imaginary part of the dielectric permittivity and dielectric loss of PE+TlInSe2 composite materials in 25。C - 150。C temperature and 25 Hz - 1 MHz frequency range before and after application of the aluminum nano-particles with a size of 50 nm. The change in the amount of semicon-ductor filler TlInSe2 and aluminum nano-particles changes the state of the surface and the frequency-temperature characteristics of composite materials PE+xvol.%TlInSe2, which allows to obtain composites with the desired dielectric permittivity and dielectric loss. 展开更多
关键词 Surface microRELIEF ALUMINUM nano-particles DIELECTRIC Permeability Tangent of the Angle DIELECTRIC Loss
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Synthesis,characterization and gas-sensing properties of Pd-doped SnO_2 nano particles 被引量:1
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作者 谭瑞琴 郭艳群 +3 位作者 赵俊华 李月 徐铁峰 宋伟杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1568-1573,共6页
SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method.The effects of Pd doping on the crystal structure,morphology,microstructure,thermal stability and surfa... SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method.The effects of Pd doping on the crystal structure,morphology,microstructure,thermal stability and surface chemistry of these nano particles were characterized by transmission electron microscope,X-ray diffractometer and X-ray photoelectron spectroscope respectively.It was observed that Pd-doping had little effect on the grain sizes of the obtained SnO2 nano particles during the hydrothermal route.During thermal annealing,Pd-doping could restrain the growth of grain sizes below 500℃ while the grain growth was promoted when the temperature increased to above 700℃.XPS results revealed that Pd existed in three chemical states in the as-synthesized sample as Pd^0,Pd^2+ and Pd^4+,respectively.Pd^4+ was the main state which was responsible for improving the gas-sensing property.The optimal Pd-doping concentration for better gas-sensing property and thermal stability was 2.0%-2.5% (mole fraction). 展开更多
关键词 SnO2 nano particles Pd-doping hydrothermal synthesis gas sensing property X-ray photoelectron spectroscopy
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TPU/Nano-ZnO复合改性沥青的性能研究及微观机制
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作者 田小革 李光耀 +4 位作者 陈功 姚世林 黄雪梅 王俊杰 陆劲州 《材料导报》 EI CAS CSCD 北大核心 2024年第16期98-107,共10页
为促进聚合物/纳米改性沥青在耐久性路面中的应用,在实验室将不同掺量的聚氨酯及纳米氧化锌添加到A-70#基质沥青中制备了复合改性沥青。采用传统物理性能试验、动态剪切流变试验(DSR)、弯曲梁流变试验(BBR)研究了其物理性能与流变特性,... 为促进聚合物/纳米改性沥青在耐久性路面中的应用,在实验室将不同掺量的聚氨酯及纳米氧化锌添加到A-70#基质沥青中制备了复合改性沥青。采用传统物理性能试验、动态剪切流变试验(DSR)、弯曲梁流变试验(BBR)研究了其物理性能与流变特性,基于响应面法的优化设计来明确两种改性剂的最佳掺量。借助傅里叶红外光谱试验(FTIR)对其微观改性机理进行探讨。采用高压紫外汞灯环境箱对改性沥青进行不同时间的紫外老化,分析其抗紫外老化能力,并基于主成分分析法评价了老化性能测试指标的显著性。结果表明:聚氨酯与纳米氧化锌的共同作用提高了基质沥青的高温稳定性及低温抗裂性,两种改性剂的最佳掺量分别为5%、3%。根据FTIR结果,复合改性沥青的改性过程既存在物理共混,又有化学加成反应。聚氨酯及纳米氧化锌的加入在基质沥青紫外老化过程中能够抑制羰基、亚砜基等极性基团的生成,复数剪切模量、羰基指数、劲度模量及亚砜基指数对沥青紫外老化性能的影响最为显著。 展开更多
关键词 聚氨酯 纳米氧化锌 复合改性沥青 宏观性能 微观机理
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“Smart”micro/nano container-based self-healing coatings on magnesium alloys:A review 被引量:3
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作者 Yonghua Chen Liang Wu +7 位作者 Wenhui Yao Jiahao Wu Maria Serdechnova Carsten Blawert Mikhail L.Zheludkevich Yuan Yuan Zhihui Xie Fusheng Pan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第7期2230-2259,共30页
Coating technologies are a commonly used way to protect metals against corrosion.However,with more and more severe service environments of materials,many protective coating systems often are not environmentally friend... Coating technologies are a commonly used way to protect metals against corrosion.However,with more and more severe service environments of materials,many protective coating systems often are not environmentally friendly or toxic as in the case of chromates.Based on the world’s abundant ideal magnesium(Mg)and its alloy,the smart self-healing anticorrosive coating can autonomously restore the damaged part of the coating according to the environmental changes,strengthen the corrosion protection ability,and prolong its service life.This paper reviews the research progress of smart self-healing coatings on Mg alloys.These coatings mostly contain suitable corrosion inhibitors encapsulated into micro/nano containers.Moreover,the different self-healing mechanisms and functionalities of micro/nano containers are discussed.The micro/nano containers range from inorganic nanocontainers such as mesoporous nanoparticles(silica(SiO_(2)),titanium dioxide(TiO_(2)),etc.),over inorganic clays(halloysite,hydrotalcite-like,zeolite),to organic nanocontainers such as polymer microcapsules,nanofibers,chitosan(CS)and cyclodextrin(CD),as well as,carbon materials such as graphene and carbon nanotubes and hybrids such as metal organic frameworks.The functioning of micro/nano containers can be divided in two principal groups:autonomous(based on defect filling and corrosion inhibition)and non-autonomous(based on dynamic bonds and shape memory polymers).Moreover,multi functionalities and composite applications of various micro/nano containers are summarized.At present,significant progress has been made in the preparation methods and technologies of micro/nano containers.Achieving long-term self-healing properties of coatings sensing of coating failure and early warning after self-healing function failure can be expected as the main development direction of self-healing corrosion protection coatings in the future. 展开更多
关键词 Magnesium alloy Self-healing coating micro/nano containers Mechanism Corrosion protection
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Micro–Nano Water Film Enabled High‑Performance Interfacial Solar Evaporation 被引量:1
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作者 Zhen Yu Yuqing Su +3 位作者 Ruonan Gu Wei Wu Yangxi Li Shaoan Cheng 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第11期503-517,共15页
Interfacial solar evaporation holds great promise to address the freshwater shortage.However,most interfacial solar evaporators are always filled with water throughout the evaporation process,thus bringing unavoidable... Interfacial solar evaporation holds great promise to address the freshwater shortage.However,most interfacial solar evaporators are always filled with water throughout the evaporation process,thus bringing unavoidable heat loss.Herein,we propose a novel interfacial evaporation structure based on the micro–nano water film,which demonstrates significantly improved evaporation performance,as experimentally verified by polypyrrole-and polydopamine-coated polydimethylsiloxane sponge.The 2D evaporator based on the as-prepared sponge realizes an enhanced evaporation rate of 2.18 kg m^(−2)h^(−1)under 1 sun by fine-tuning the interfacial micro–nano water film.Then,a homemade device with an enhanced condensation function is engineered for outdoor clean water production.Throughout a continuous test for 40 days,this device demonstrates a high water production rate(WPR)of 15.9–19.4 kg kW^(−1)h^(−1)m^(−2).Based on the outdoor outcomes,we further establish a multi-objective model to assess the global WPR.It is predicted that a 1 m^(2)device can produce at most 7.8 kg of clean water per day,which could meet the daily drinking water needs of 3 people.Finally,this technology could greatly alleviate the current water and energy crisis through further large-scale applications. 展开更多
关键词 micronano water film Interfacial solar evaporation Solar desalination Artificial neural networks PPy sponge
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Research on Infrared Emissivity and Laser Reflectivity of Sn_(1−x)Er_(x)O_(2)Micro/Nanofibers Based on First-Principles 被引量:1
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作者 Yuanjia Xia Fang Zhao +2 位作者 Zhizun Li Zhaogang Cheng Jianwei Hu 《Journal of Renewable Materials》 SCIE EI 2023年第2期921-936,共16页
Sn_(1−x)Er_(x)O_(2)(x=0%,8%,16%,24%)micro/nanofibers were prepared by electrospinning combined with heat treatment using erbium nitrate,stannous chloride and polyvinylpyrrolidone(PVP)as raw materials.The target produc... Sn_(1−x)Er_(x)O_(2)(x=0%,8%,16%,24%)micro/nanofibers were prepared by electrospinning combined with heat treatment using erbium nitrate,stannous chloride and polyvinylpyrrolidone(PVP)as raw materials.The target products were characterized by thermogravimetric analyzer,X-ray diffrotometer,fourier transform infrared spectrometer,scanning electron microscope,spectrophotometer and infrared emissivity tester,and the effects of Er^(3+)doping on its infrared and laser emissivity were studied.At the same time,the Sn_(1−x)Er_(x)O_(2)(x=0%,16%)doping models were constructed based on the first principles of density functional theory,and the related optoelectronic properties such as their energy band structure,density of states,reflectivity and dielectric constant were analyzed,and further explained the mechanism of Er^(3+)doping on SnO_(2)infrared emissivity and laser absorption from the point of electronic structure.The results showed that after calcination at 600℃,single rutile type SnO_(2)was formed,and the crystal structure was not changed by doping Er^(3+).The calcined products showed good fiber morphology,and the average fiber diameter was 402 nm.The infrared emissivity and resistivity of the samples both decreased first and then increased with the increase of Er^(3+)doping amount.When x=16%,the infrared emis-sivity of the sample was at least 0.71;and Er^(3+)doping can effectively reduce the reflectivity of SnO_(2)at 1.06μm and 1.55μm,when x=16%,its reflectivity at 1.06μm and 1.55μm are 50.5%and 40%,respectively,when x=24%,the reflectivity at 1.06μm and 1.55μm wavelengths are 47.3%and 42.1%,respectively.At the same time,the change of carrier concentration and electron transition before and after Er^(3+)doping were described by first-principle calculation,and the regulation mechanism of infrared emissivity and laser reflectivity was explained.This study provides a certain experimental and theoretical basis for the development of a single-type,light-weight and easily prepared infrared and laser compatible-stealth material. 展开更多
关键词 micro/nano fibers Er^(3+)doping SnO_(2) laser and infrared compatible stealth material
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Stabilizing silica nanoparticles in high saline water by using polyvinylpyrrolidone for reduction of asphaltene precipitation damage under dynamic condition 被引量:4
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作者 Mohammad Reza Aghajanzadeh Mohammad Sharifi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第5期1021-1029,共9页
In this study, the performance of stable nanofluid containing SiO2 nanoparticles dispersed and stabilized in high salinity brine for asphaltene inhibition in dynamic condition is evaluated. In the first stage of this ... In this study, the performance of stable nanofluid containing SiO2 nanoparticles dispersed and stabilized in high salinity brine for asphaltene inhibition in dynamic condition is evaluated. In the first stage of this work, the stability of silica nanoparticles in different range of water salinity(0–100000 mg·L-1) is investigated. Next, stable nanofluid containing highest salinity is selected as asphaltene inhibitor agent to inject into the damaged core sample. The estimated values of oil recovery for base case, after damage process and after inhibition of asphaltene precipitation using nanofluid are 51.6%, 36.1% and 46.7%, respectively. The results showed the reduction in core damage after using nanofluid. In addition, the relative permeability curves are plotted for the base case, after damage process and also after inhibition of asphaltene precipitation using nanofluid. Comparison of relative permeability curves shows, relative permeability of oil phase decreased after damage process as compared with the base case. But after using nanofluid the oil relative permeability curve has shifted to the right and effective permeability of oil phase has been improved. 展开更多
关键词 Formation DAMAGE Enhanced oil recovery SALINITY ASPHALTENE Core FLOODING nano particles
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Magnetic Field Effect and Heat Transfer of Nanofluids within Waveform Microchannel
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作者 Mehdi Moslemi Motahare Mahmoodnezhad +2 位作者 S.A.Edalatpanah Sulima Ahmed Mohammed Zubair Hamiden Abd El-Wahed Khalifa 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第3期1957-1973,共17页
In this research,a numerical study of mixed convection of non-Newtonian fluid and magnetic field effect along a vertical wavy surface was investigated.A simple coordinate transformation to transform wavy surface to a ... In this research,a numerical study of mixed convection of non-Newtonian fluid and magnetic field effect along a vertical wavy surface was investigated.A simple coordinate transformation to transform wavy surface to a flat surface is employed.A cubic spline collocation numerical method is employed to analyze transformed equations.The effect of various parameters such as Reynolds number,volume fraction 0-,Hartmann number,and amplitude of wave length was evaluated in improving the performance of a wavy microchannel.According to the presented results,the sinusoidal shape of the microchannel has a direct impact on heat transfer.By increasing the microchannel wave amplitude,the Nusselt number has risen.On the other hand,increasing the heat transfer in the higher wavelength ratio corrugated channel is seen as an effective method of increasing the heat transfer,especially at higher Reynolds numbers.The results showed that with increasing Hartmann numbers,the flow line near thewall becomesmore regular and,according to the temperature gradient created,theNusselt number growth. 展开更多
关键词 Heat transfer magnetic field nano fluid VORTICITY wavy micro channel
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Creep-Recovery and Relaxation Behavior of High Density Polyethylene/Hydroxyapatite Nano Particles for Bone Substitutes: Effects of Gamma Radiation 被引量:2
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作者 H. Fouad Othman Y. Alothman 《Journal of Biosciences and Medicines》 2014年第2期64-66,共3页
The following article has been retracted due to the fact that it cannot be accepted by the author as a journal publication. The Editorial Board takes a very strong respect to the author’s situation on this matter. Th... The following article has been retracted due to the fact that it cannot be accepted by the author as a journal publication. The Editorial Board takes a very strong respect to the author’s situation on this matter. This paper published in Journal of Biosciences and Medicines Vol.2 No.2, April 2014, has been removed from this site. 展开更多
关键词 nano particle HYDROXYAPATITE CREEP RECOVERY RELAXATION Bone SUBSTITUTE Radiation
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STRUCTURAL DETERMINATION OF TITANIUM-OXIDE NANOPARTICLES BY X-RAY ABSORPTION SPECTROSCOPY 被引量:1
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作者 Z.Y. Wu J. Zhang +10 位作者 K. Ibrahim M.I. Abbas G. Li Y. Tao T.D. Hu F.Q. Liu H.J. Qian Y.N. Xie Q.H. Zhang L. Gao Z.Z. Chen 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第1期53-57,共5页
As a potential application of titanium-oxide nanoparticles, it is extremely important to investigate a detailed picture of the surface and interior structural properties of nanocrystalline materials, such as rutile an... As a potential application of titanium-oxide nanoparticles, it is extremely important to investigate a detailed picture of the surface and interior structural properties of nanocrystalline materials, such as rutile and anatase with diameters 7.0 and 4.5nm, respectively. X-ray absorption spectroscopy has been used to identify the local Ti environment and related electronic structure. We combine the experimental results at the Ti edge in both bulk and nano-crystals to determine the lattice distortion in terms of differently characteristic preedge features and the variation in the multiple-scattering region of X-ray absorption near-edge structure (XANES) spectra. The relationship between the transition peaks and the surface-to volume ratio is also discussed. 展开更多
关键词 X-ray absorption near edge structure nano particle transition metal oxide
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Enhanced thermoelectric performance through homogenously dispersed MnTe nanoparticles in p-type Bi_(0.52)Sb_(1.48)Te_3 nanocomposites 被引量:1
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作者 Tian-Qi Lu Peng-Fei Nan +3 位作者 Si-Long Song Xin-Yue Zhu Huai-Zhou Zhao Yuan Deng 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第4期96-102,共7页
In this work,we report that the thermoelectric properties of Bi(0.52)Sb(1.48)Te3alloy can be enhanced by being composited with Mn Te nano particles(NPs)through a combined ball milling and spark plasma sintering... In this work,we report that the thermoelectric properties of Bi(0.52)Sb(1.48)Te3alloy can be enhanced by being composited with Mn Te nano particles(NPs)through a combined ball milling and spark plasma sintering(SPS)process.The addition of Mn Te into the host can synergistically reduce the lattice thermal conductivity by increasing the interface phononscattering between Bi(0.52)Sb(1.48)Te3 and MnTe NPs,and enhance the electrical transport properties by optimizing the hole concentration through partial Mn^2+ acceptor doping on the Bi^3+ sites of the host lattice.It is observed that the lattice thermal conductivity decreases with increasing the percentage of Mn Te and milling time in a temperature range from 300 Kto 500 K,which is consistent with the increasing of interfaces.Meanwhile,the bipolar effect is constrained to high temperatures,which results in the figure of merit z T peak shifting toward higher temperature and broadening the z T curves.The engineering z T is obtained to be 20%higher than that of the pristine sample for the 2-mol%Mn Te-added composite at a temperature gradient of 200 K when the cold end temperature is set to be 300 K.This result indicates that the thermoelectric performance of Bi0.52Sb1.48Te3 can be considerably enhanced by being composited with Mn Te NPs. 展开更多
关键词 MnTe nano particles interface phonon scattering bipolar effect higher engineering zT
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