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Photocatalytic degradation of formaldehyde using mesoporous TiO_2 prepared by evaporation-induced self-assembly 被引量:5
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作者 黎成勇 贾艳荣 +2 位作者 张向超 张世英 唐爱东 《Journal of Central South University》 SCIE EI CAS 2014年第11期4066-4070,共5页
The mesoporous Ti O2 has been synthesized by evaporation induced self assembly(EISA) method. The thermogravimetric/differential scanning calorimetric(TG/DSC), X-ray diffraction(XRD), high-resolution transmission elect... The mesoporous Ti O2 has been synthesized by evaporation induced self assembly(EISA) method. The thermogravimetric/differential scanning calorimetric(TG/DSC), X-ray diffraction(XRD), high-resolution transmission electron microscopy(HR-TEM) and N2 adsorption desorption and adsorption are used to study the effects of the synthesized process condition on the microstructure of the as-synthesized mesoporous Ti O2. The photocatalytic performances of as-synthesized samples are evaluated by the degradation of the formaldehyde under ultraviolet light irradiations. The results demonstrate that the as-synthesized mesoporous Ti O2 are anatase with the uniform size about 20-40 nm. The sample is prepared using cetyltrimethyl ammonium bromide(CTAB) as the template with average pore size distribution of 8.12 nm, specific surface area of 68.47 m2/g and pore volume of 0.213 m L/g. The samples show decomposition of formaldehyde 95.8% under ultraviolet light irradiations for 90 min. These results provide a basic experimental process for preparation mesoporous Ti O2, which will posses a broad prospect in terms of the applications in improving indoor air quality. 展开更多
关键词 mesoporous TiO2 photocatalysis formaldehyde evaporation induced self assembly(EISA)
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Self-assembly of α-6T Molecule on Ag(100) and Related STM Induced Luminescence
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作者 陈哥国 张超 +1 位作者 张瑞 董振超 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第6期659-664,I0003,共7页
We have investigated the self-assembly and light emission properties of organic α- sexithiophene (α-6T) molecules on Ag(100) under different coverage by scanning tunneling microscopy (STM). At very low coverag... We have investigated the self-assembly and light emission properties of organic α- sexithiophene (α-6T) molecules on Ag(100) under different coverage by scanning tunneling microscopy (STM). At very low coverage, the α-6T molecules form a unique enantiomer by grouping four molecules into a windmill supermolecular structure. As the coverage is increased,α-6T molecules tend to pack side by side into a denser stripe structure. Further increase of the coverage will lead to the layer-by-layer growth of molecules on Ag(100) with the lower-layer stripe pattern serving as a template. Molecular fluorescence for α-6T molecules on Ag(100) at a coverage of five monolayers has been detected by light excitations, which indicates a well decoupled electronic states for the top-layer α-6T molecules. However, the STM induced luminescent spectra for the same sample reveal only plasmonic-like emission. The absence of intramolecular fluorescence in this case suggests that the electronic decoupling is not a sufficient condition for generating photon emission from molecules. For intramolecular fluorescence to occur, the orientation of the dynamic dipole moment of molecules and the energy-level alignment at the molecule-metal interface are also important so that molecules can be effectively excited through efficient dipolar coupling with local plasmons and by injecting holes into the molecules. 展开更多
关键词 α-Sexithiophene self-assembly Scanning tunneling microscopy Tunneling electron induced luminescence Surface plasmon Plasmon-exciton coupling
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Tunneling Electron Induced Fluorescence from Single Porphyrin Molecules Decoupled by Striped-Phase Octanethiol Self-assembled Monolayer
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作者 邝艳敏 郁杰 +4 位作者 骆阳 朱嘉哲 廖源 张杨 董振超 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2016年第2期157-160,I0001,共5页
We investigate tunneling electron induced luminescence from isolated single porphyrin molecules that are decoupled by striped-phase self-assembled monolayer of octanethiol from the underneath Au(111) substrate. Intr... We investigate tunneling electron induced luminescence from isolated single porphyrin molecules that are decoupled by striped-phase self-assembled monolayer of octanethiol from the underneath Au(111) substrate. Intrinsic single-molecule electroluminescence has been realized by such decoupling at both bias polarities. The photon emission intensity acquired from the molecular lobe is found stronger than that from the molecular center. These re- sults provide useful information on the understanding of electroluminescent behavior and mechanism in molecular tunnel junctions. 展开更多
关键词 Scanning tunneling microscope induced luminescence PLASMONICS PORPHYRIN Octanethiol self-assembled monolayer Striped-phase
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Surface-induced evaporative cooling
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作者 柯敏 颜波 +1 位作者 程锋 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第10期4274-4280,共7页
The effects of surface-induced evaporative cooling on an atom chip are investigated. The evolutions of temperature, number and phase-space density of the atom cloud are measured when the atom cloud is brought close to... The effects of surface-induced evaporative cooling on an atom chip are investigated. The evolutions of temperature, number and phase-space density of the atom cloud are measured when the atom cloud is brought close to the surface. Rapid decrease of the temperature and number of the atoms is found when the atom-surface distance is 〈 100 ttm. A gain of about a factor of five on the phase-space density is obtained. It is found that the efficiency of the surface-induced evaporative cooling depends on the atom-surface distance and the shape of the evaporative trap. When the atoms are moved very close to the surface, severe heating is observed, which dominates when the holding time is 〉 8 ms. It is important that the surface-induced evaporative cooling offers novel possibilities for the realization of a continuous condensation, where a spatially varying evaporative cooling is required. 展开更多
关键词 atom chip atom-surface distance surface-induced evaporative cooling
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The effect of solvent in evaporation-induced self-assembly:A case study of benzene periodic mesoporous organosilica 被引量:1
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作者 WANG WenDong FAULKNER Daniel +1 位作者 MOIR Jonathon OZIN Geoffrey A 《Science China Chemistry》 SCIE EI CAS 2011年第12期1920-1925,共6页
Volatile organic solvents were considered to have little influence on the synthesis of mesostructured materials through evaporation-induced self-assembly(EISA),because upon evaporation they leave the sol and hence do ... Volatile organic solvents were considered to have little influence on the synthesis of mesostructured materials through evaporation-induced self-assembly(EISA),because upon evaporation they leave the sol and hence do not interfere with the self-assembly process.We show here that the choice of solvent is crucial in the synthesis of thin films of phenylene-bridged periodic mesoporous organosilica(benzene PMO).Methanol is found to be a better solvent for the synthesis of thin films,whereas ethanol favors the formation of(HO)3Si-C6H4-Si(OH)3 crystals,the identity and structure of which is established by X-ray diffraction.A ternary reactant composition diagram is designed to visualize the relationship among multiple synthesis experiments and to guide the interpretation of experimental results and optimization of the quality of the periodic mesoporous organosilica film.Our study highlights the importance of solvent choice,a factor often neglected in EISA.We expect it to inspire researchers to explore the effect of solvent in designing the synthesis of mesoporous materials. 展开更多
关键词 mesoporous materials periodic mesoporous organosilica evaporation induced self assembly thin films
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Microstructure and 355 nm Laser-Induced Damage Characteristics of Al<sub>2</sub>O<sub>3</sub>Films Irradiated with Oxygen Plasma under Different Energy 被引量:1
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作者 Dongping Zhang Yan Li +6 位作者 Jingting Luo Zhuanghao Zheng Guangxing Liang Xingmin Cai Fan Ye Ping Fan Jianjun Huang 《Optics and Photonics Journal》 2013年第2期152-157,共6页
Al2O3 films were prepared using electron beam evaporation at room temperature. The samples were irradiated with oxygen plasma under different energy. The variations in average surface defect density and root mean squa... Al2O3 films were prepared using electron beam evaporation at room temperature. The samples were irradiated with oxygen plasma under different energy. The variations in average surface defect density and root mean square (RMS) surface roughness were characterized using an optical microscope and an atomic force microscope. Surface average defect density increased after plasma treatment. The RMS surface roughness of the samples decreased from 1.92 nm to 1.26 nm because of surface atom restructuring after oxygen plasma conditioning. A 355 nm laser-induced damage experiment indicated that the as-grown sample with the lowest defect density exhibited a higher laser-induced damage threshold (1.12 J/cm2) than the other treated samples. Laser-induced damage images revealed that defect is one of the key factors that affect laser-induced damage on Al2O3 films. 展开更多
关键词 Thin Film LASER-induced Damage Electron Beam evaporation Plasma IRRADIATION
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The effect of solvent in evaporation-induced self-assembly:A case study of benzene periodic mesoporous organosilica
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作者 WANG WenDong FAULKNER Daniel +1 位作者 MOIR Jonathon OZIN Geoffrey A. 《中国科学:化学》 CAS CSCD 北大核心 2012年第1期114-115,共2页
Volatile organic solvents were considered to have little influence on the synthesis of mesostructured materials through evaporation-induced self-assembly(EISA),because upon evaporation they leave the sol and hence do ... Volatile organic solvents were considered to have little influence on the synthesis of mesostructured materials through evaporation-induced self-assembly(EISA),because upon evaporation they leave the sol and hence do not interfere with the self-assembly process.We show here that the choice of solvent is crucial in the synthesis of thin films of phenylene-bridged periodic mesoporous organosilica(benzene PMO).Methanol is found to be a better solvent for the synthesis of thin films,whereas ethanol favors the formation of(HO)3Si-C6H4-Si(OH)3 crystals,the identity and structure of which is established by X-ray diffraction.A ternary reactant composition diagram is designed to visualize the relationship among multiple synthesis experiments and to guide the interpretation of experimental results and optimization of the quality of the periodic mesoporous organosilica film.Our study highlights the importance of solvent choice,a factor often neglected in EISA.We expect it to inspire researchers to explore the effect of solvent in designing the synthesis of mesoporous materials. 展开更多
关键词 溶剂蒸发 介孔材料 周期性 自组装 诱导 挥发性有机溶剂 案例
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基于最小二乘法的间冷开式循环水系统水量损失计算
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作者 袁亮 韩会亮 +1 位作者 高磊 黄畅辉 《炼油技术与工程》 CAS 2024年第10期45-47,51,共4页
某炼油厂循环水系统每天的计算水损失量与实际水损失量存在一定的偏差。针对该问题,对该套循环水系统水量损失的计算情况进行了校正。通过试验装置的水量损失数据与计算数据对比并利用最小二乘法进行拟合,拟合后的曲线最优区间变化斜率... 某炼油厂循环水系统每天的计算水损失量与实际水损失量存在一定的偏差。针对该问题,对该套循环水系统水量损失的计算情况进行了校正。通过试验装置的水量损失数据与计算数据对比并利用最小二乘法进行拟合,拟合后的曲线最优区间变化斜率k控制在1.06~1.09且循环水最优区间变化截距b控制在14~19时,实际损失量与计算数值的偏差率可控制在5%以内;当k取值为1.07且b取值为15时,最大偏差率仅为4.77%,验证了该算法的可行性。 展开更多
关键词 循环水 水量损失 蒸发损失 风吹损失 最小二乘法
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纤维素纳米晶体基光子晶体薄膜材料的制备及性能研究进展
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作者 宗广龙 程正柏 +1 位作者 孟亚会 赵会芳 《中国造纸》 CAS 北大核心 2024年第9期7-12,共6页
纤维素纳米晶体(CNC)是从天然纤维中提取出的一种纳米级纤维素,可通过蒸发诱导自组装(EISA)法形成具有手性向列结构的薄膜,并提供直观的可视化信息,是新一代光子液晶材料的首选。然而,目前CNC基光子材料存在力学性能和动态光学响应性能... 纤维素纳米晶体(CNC)是从天然纤维中提取出的一种纳米级纤维素,可通过蒸发诱导自组装(EISA)法形成具有手性向列结构的薄膜,并提供直观的可视化信息,是新一代光子液晶材料的首选。然而,目前CNC基光子材料存在力学性能和动态光学响应性能差等问题,难以实现其功能化扩展,所以通常引入添加剂来提高其柔韧性和适应性。本文结合CNC特性,系统地阐述了当前光子晶体膜的制备工艺及其影响因素,并归纳出不同的可控制备方案,包括力学强度、色彩响应性等,同时分析了CNC基光子材料在不同领域的潜在应用和发展趋势。 展开更多
关键词 纤维素纳米晶体 蒸发诱导自组装 光子晶体薄膜 功能材料
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Low Temperature Solvent Evaporation-induced Crystallization Synthesis of Nanocrystalline TiO_2 Photocatalyst 被引量:1
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作者 余家国 余济美 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2003年第8期994-997,共4页
A novel and efficient methodology for obtaining highly active photocatalyst of bi phase TiO 2 with small particle size and high specific surface area was developed by solvent evaporation induced crystallization (SE... A novel and efficient methodology for obtaining highly active photocatalyst of bi phase TiO 2 with small particle size and high specific surface area was developed by solvent evaporation induced crystallization (SEIC) method at low temperature. The prepared TiO 2 powder was characterized with X ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results showed that the photocatalytic activity of the TiO 2 powder prepared by this method approached that of Degussa P25. This may be attributed to the fact that the prepared TiO 2 powder had larger specific surface areas (265 m 2·g -1 ) and smaller crystallite size (about 5 nm), but relatively low crystallinity, as compared with Degussa P25. 展开更多
关键词 solvent evaporation induced crystallization method titanium dioxide NANOCRYSTALLINE PHOTOCATALYST
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Spatial weak-light ring soliton in self-assembled quantum dots 被引量:1
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作者 陈秋成 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第12期235-239,共5页
By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum ... By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum dots. It is found that this system can exhibit the transparency, and the width of the transparency window becomes wider with the increase of control light field. Interestingly, a weak probe light beam can form spatial weak-light dark solitons. When it propagates along the axial direction, the soliton will transform into a steady spatial weak-light ring dark soltion. In addition, the stability of two-dimensional spatial optical solitons is testified numerically. 展开更多
关键词 spatial weak-light ring dark soliton electromagnetically induced transparency self-assembled quantum dots
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Evaporation-induced Morphology Pattern of Triblock Copolymer A5B10C5 in Thin Film: a Multibody DPD Simulation Study 被引量:2
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作者 LI Yang WANG Dequan +4 位作者 WANG Wei LI Yanchun HUANG Xuri SUN Chiachung JIN Mingxing 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2014年第1期144-148,共5页
We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer ... We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer A5B10C5 in thin film.With changing attractive interactions between solvent vapor and triblock copolymer that represent various selective solvents,lamellar morphology,sandwich lamellar morphology,spherical morphology and disorder morphology patterns of the thin films were obtained for both coil-coil-coil and rod-coil-coil chain architectures,respectively.The order parameter and the film thickness were calculated during the process for characterizing the film properties,and it was found that the rigid A-block of the triblock copolymer hinders the formation of an ordered structure. 展开更多
关键词 Multibody dissipative particle dynamics evaporation-induced Morphology pattern Thin film
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Preparation and characterization of highly photoactive nanocrystalline TiO_(2)powders by solvent evaporation-induced crystallization method 被引量:1
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作者 余家国 余济美 +1 位作者 程蓓 赵修建 《Science China Chemistry》 SCIE EI CAS 2003年第6期549-557,共9页
Highly photoactive bi-phase nanocrystalline TiO2 photocatalyst was prepared by a solvent evaporation-induced crystallization (SEIC) method, and calcined at different temperatures. The obtained TiO2 photocatalyst was c... Highly photoactive bi-phase nanocrystalline TiO2 photocatalyst was prepared by a solvent evaporation-induced crystallization (SEIC) method, and calcined at different temperatures. The obtained TiO2 photocatalyst was characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results show that solvent evaporation can promote the crystallization and phase transformation of TiO2 at 100°C. When calcination temperatures are below 600°C, the prepared TiO2 powders show bimodal pore size distributions in the mesoporous region. At 700°C, the pore size distributions exhibit monomodal distribution of the inter-aggregated pores due to the collapse of the intra-aggregated pores. At 100°C, the obtained TiO2 photocatalyst by this method shows good photocatalytic activity, and at 400°C, its photocatalytic activity exceeds that of Degussa P25. This may be attributed to the fact that the prepared TiO2 photocatalyst has higher specific surface areas, smaller crystallite size and bimodal pore size distribution. 展开更多
关键词 nanocrystalline TiO2 photocatalyst preparation SOLVENT evaporation-induced crystallization method.
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Experimental investigation of evaporative cooling mixture of bosonic ^(87)Rb and fermionic ^(40)K atoms with microwave and radio frequency radiation
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作者 王鹏军 熊德智 +1 位作者 付正坤 张靖 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第1期515-520,共6页
We investigate sympathetic cooling fermions 40K by evaporatively cooling bosonic 87Rb atoms in a magnetic trap with microwave and radio frequency induced evaporations in detail. The mixture of bosonic and fermionic at... We investigate sympathetic cooling fermions 40K by evaporatively cooling bosonic 87Rb atoms in a magnetic trap with microwave and radio frequency induced evaporations in detail. The mixture of bosonic and fermionic atoms is prepared in their polarized spin states IF = 9/2, mF = 9/2) for 40K and IF = 2, mF=2〉 for 87Rb, which is trapped in Quadrupole-Ioffe-Configuration trap. Comparing microwave with radio frequency evaporatively cooling bosonic STRb atoms with sympathetically cooling Fermi gas 40K, we find that the presence of rubidium atoms in the [2, 1} Zeeman states, which are generated in the evaporative process, gives rise to a significant loss of 40K due to inelastic collisions. Thus, the rubidium atoms populated in the [2, 1} Zeeman states should be removed in order to effectively perform sympathetically cooling 40K with the evaporatively cooled STRb atoms. 展开更多
关键词 microwave and radio frequency induced evaporation sympathetically cooling inelasticcollisions
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合成气制低碳烯烃串联反应中Zn-Al氧化物的制备及性能 被引量:2
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作者 李保珍 孟凡会 +1 位作者 王丽娜 李忠 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2023年第1期111-119,共9页
以工业拟薄水铝石为铝源,通过微波辅助蒸发诱导自组装(M-EISA)法制备了一系列不同Zn/Al原子比的Zn-Al氧化物,并与SAPO-18分子筛物理混合后考察其催化合成气制低碳烯烃(C_(2)^(=)-C_(4)^(=))反应性能。采用X射线衍射(XRD)、透射电镜(TEM)... 以工业拟薄水铝石为铝源,通过微波辅助蒸发诱导自组装(M-EISA)法制备了一系列不同Zn/Al原子比的Zn-Al氧化物,并与SAPO-18分子筛物理混合后考察其催化合成气制低碳烯烃(C_(2)^(=)-C_(4)^(=))反应性能。采用X射线衍射(XRD)、透射电镜(TEM)、N_(2)吸附-脱附、CO和H_(2)程序升温脱附(CO-TPD、H_(2)-TPD)、X射线光电子能谱(XPS)等进行表征。M-EISA法制备的Zn-Al氧化物随Zn/Al原子比的增加,比表面积和孔容逐渐下降,平均孔径先增大后降低。与浸渍(IP)法制备的ZnAl-IP相比,Zn/Al原子比为1∶2的ZnAl_(2)O_(x)样品中Zn分散度高,形成的ZnAl_(2)O_(4)尖晶石结构产生了更多的氧空位。催化结果表明,M-EISA法制备的Zn-Al样品活性随Zn/Al原子比的增加而先增加后减小,(C_(2)^(=)-C_(4)^(=))选择性逐渐降低。ZnAl_(2)O_(x)样品的CO转化率最高(34.8%),且反应50 h未见明显失活,催化性能明显优于ZnAl-IP样品。 展开更多
关键词 合成气转化 低碳烯烃 Zn-Al氧化物 双功能催化剂 微波辅助蒸发诱导自组装法
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还原氧化石墨烯气凝胶水蒸发诱导发电性能的研究
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作者 戴萌 薛开诚 +1 位作者 郭立 付萍 《武汉工程大学学报》 CAS 2023年第6期628-634,共7页
为了增强氧化石墨烯(GO)水蒸发诱导发电性能,采用水热还原法和冷冻干燥法制备得到了还原氧化石墨烯气凝胶(rGOAs),并通过等离子体处理得到了具有稳定空间结构且富含含氧官能团的rGOAs。研究了还原剂与GO的质量比、等离子体处理时间、气... 为了增强氧化石墨烯(GO)水蒸发诱导发电性能,采用水热还原法和冷冻干燥法制备得到了还原氧化石墨烯气凝胶(rGOAs),并通过等离子体处理得到了具有稳定空间结构且富含含氧官能团的rGOAs。研究了还原剂与GO的质量比、等离子体处理时间、气凝胶与水面接触角以及湿度对rGOAs发电性能的影响。研究结果表明:当还原剂与GO质量比为1:1,空气等离子体处理时间为120 s,样品与水面的接触角度为60°且湿度为20%时,制备的rGOA具有最佳的发电性能,其开路电压约为0.415 V。rGOAs在可持续发展领域具有应用前景,可以为电子设备以及能源存储器件供电。 展开更多
关键词 还原氧化石墨烯 等离子体 气凝胶 水蒸发诱导发电
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乙二醇蒸发塔裂纹机理分析及防护措施
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作者 孔唯康 刘建杰 +2 位作者 王芳芳 张洪伟 刘骏 《管道技术与设备》 CAS 2023年第4期58-62,共5页
某厂4台EG蒸发塔检修过程中发现大量密集裂纹,为分析裂纹成因并提出处理措施,通过渗透检测、硬度测试、金相分析等方法,发现了裂纹产生机理。敏化、发生应变诱导马氏体相变的0Cr18Ni9,在温度、应力以及带有微量Cl^(-)和SO_(4)^(2-)的复... 某厂4台EG蒸发塔检修过程中发现大量密集裂纹,为分析裂纹成因并提出处理措施,通过渗透检测、硬度测试、金相分析等方法,发现了裂纹产生机理。敏化、发生应变诱导马氏体相变的0Cr18Ni9,在温度、应力以及带有微量Cl^(-)和SO_(4)^(2-)的复杂腐蚀介质的协和交互作用下,产生网状沿晶或穿晶应力腐蚀裂纹。根据EG蒸发塔内壁裂纹形成机理,采取打磨消除补焊以及同材质贴板的方法,复检合格后未发现裂纹,处理措施经济有效,为类似0Cr18Ni9材料裂纹产生机理分析和处理提供参考。 展开更多
关键词 0CR18NI9 应变诱导马氏体 敏化 应力腐蚀裂纹 EG蒸发塔
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鼓泡蒸发式太阳能海水淡化装置的试验研究 被引量:8
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作者 刘忠 曾胜 +1 位作者 沈海平 金涛 《水处理技术》 CAS CSCD 北大核心 2010年第8期75-79,共5页
基于鼓泡蒸发和露点蒸发机理,设计建造了一台综合利用太阳能的鼓泡蒸发式海水淡化装置,并对该装置进行了鼓泡蒸发试验。试验对装置的稳态蒸发性能进行了研究,给出了装置在特定的运行温度和压力,不同的鼓气量和引风量下的产水率、耗电当... 基于鼓泡蒸发和露点蒸发机理,设计建造了一台综合利用太阳能的鼓泡蒸发式海水淡化装置,并对该装置进行了鼓泡蒸发试验。试验对装置的稳态蒸发性能进行了研究,给出了装置在特定的运行温度和压力,不同的鼓气量和引风量下的产水率、耗电当量及经济性能系数。结果表明,由于在装置中采用了鼓泡蒸发技术,并对蒸汽进行了引风的强制对流措施,从而提高了装置的产水率,使装置具备较高的经济性能系数。 展开更多
关键词 太阳能海水淡化 鼓泡蒸发 引风 露点蒸发
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1064nm与532nm激光对电子束蒸发制备的HfO2/SiO2高反膜损伤比较 被引量:10
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作者 李大伟 陶春先 +2 位作者 李笑 赵元安 邵建达 《强激光与粒子束》 EI CAS CSCD 北大核心 2008年第9期1457-1460,共4页
研究了电子束蒸发制备的HfO2/SiO2高反膜在1 064 nm与532 nm激光辐照下的损伤行为。基频激光辐照时损伤形貌主要为节瘤缺陷喷溅留下的锥形坑,当能量密度较大时出现分层剥落;二倍频激光损伤主要是由电子缺陷引起的平底坑,辐照脉冲能量密... 研究了电子束蒸发制备的HfO2/SiO2高反膜在1 064 nm与532 nm激光辐照下的损伤行为。基频激光辐照时损伤形貌主要为节瘤缺陷喷溅留下的锥形坑,当能量密度较大时出现分层剥落;二倍频激光损伤主要是由电子缺陷引起的平底坑,辐照脉冲能量密度稍高时也会产生吸收性缺陷引起的锥形坑,但电子缺陷的损伤阈值更低;随着辐照脉冲能量密度的增大分层剥落逐渐成为主要的损伤形貌。分析认为,辐照激光波长的变化,引起吸收机制的变化从而导致了损伤阈值及损伤机制的差异。 展开更多
关键词 光学薄膜 激光损伤 电子束蒸发 电子缺陷
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Balancing free and confined metallic Ni for an active and stable catalyst——A case study of CO methanation over Ni/Ni–Al2O3 被引量:1
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作者 Yong-Shan Xiao Yong-Hong Song +5 位作者 Chang Liu Xian-Ying Shi Han-Qing Ge Min-Li Zhu Zhao-Tie Liu Zhong-Wen Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第11期73-84,共12页
We propose a new strategy to make an active and stable Ni-based catalyst which can be operated in a wide range of reaction temperatures. The ordered mesoporous alumina(OMA) with confined Ni in the pore wall(Ni-OMA) wa... We propose a new strategy to make an active and stable Ni-based catalyst which can be operated in a wide range of reaction temperatures. The ordered mesoporous alumina(OMA) with confined Ni in the pore wall(Ni-OMA) was prepared via the one-pot evaporation induced self-assembly method. By using the incipient impregnation method, different amounts of free Ni were loaded over Ni-OMA(Ni/NiOMA) at a fixed total NiO content of 15 wt%. Characterization results confirmed the formation of wellstructured Ni-OMA, and the ordered structure was still well preserved even after impregnating NiO at a content of as high as 12 wt%. The catalysts were evaluated for the CO methanation as a model reaction under varied conditions. Importantly, the activity and stability of Ni/Ni-OMA for the titled reaction were significantly regulated by simply changing the ratio of the confined to free Ni. Over the optimum catalyst of NiO(2 wt%)/NiO(13 wt%)-OMA, the high activity at a temperature of as low as 300 ℃ was achieved with the space-time yield of methane over 7.6 g gcat-1 h-1 while a long-term stability for a time-onstream of 400 h was confirmed without an observable deactivation under the conditions of 600 ℃ and an extremely high gas hourly space velocity of 120,000 mL g-1 h-1. The results were well explained as the integrated merits of the free Ni for a high dispersion and the confined Ni in OMA for the anti-sintering property. 展开更多
关键词 CO methanation NI Ordered mesoporous alumina evaporation induced self-assembly Ni-support interactions
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