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Size Effect on the Radiation Stability Silicon Dioxide Sphere Particles

Journal of Harbin Institute of technology(New Series) 2024年第4期31卷 1-12页

作者： Vitaly Neshchimenko Chundong Li Mikhail Mikhailov Jinpeng Lv Laboratory of Radiation Stability Evaluation of Thermal Control Coatings Amur State UniversityBlagoveshchensk 675000Russia Science and Technology on Material Performance Evaluating in Space Environment Laboratory Harbin Institute of TechnologyHarbin 150001China Radiation and Space Materials Laboratory Tomsk State University of Control Systems and Radio-ElectronicsTomsk 634050Russia Department of Material Science and Technology Nanjing University of Aeronautics&AstronauticsNanjing 210016China

The effect of protons(E = 100 keV,F = 5×10^(15) cm^(-2)) exposure on the diffuse reflectance spectra of the SiO_(2 )with different size particles in wavelength range from 250 to 2500 nm have been *** were nanosphere,submicrosphere,microsphere and submacrosphere,as well as solid micro-and *** synthesis of the particles was carried out by the formation of silica shells and dissolution of the polystyrene core *** surface morphology,surface area and crystal structure of the particles have been *** evaluating the changes of the solar absorptance,it was found that the radiation stability of the micro-and submacro-hollow particles is higher than that of the other nanostructured particles,except for solid *** low radiation stability of the hollow microparticles is due to the large void inside the hollow particles where radiation defects are not formed.

关键词： silicon dioxide hollow particles spectral reflectance irradiation

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AI-driven predictions of electrochemical CO 2 reduction catalysts: Insights from in situ spectroscopy

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International Journal of Hydrogen Energy 2025年 143卷 37-43页

作者： Yumeng Li Yingmin Jin Tianfeng Zhang Mengyu Fu Ruifan Lin Yuxin Gong Guanshu Li Yueping Xiong MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 PR China Xincheng Information Technology Co. Ltd Shijiazhuang 050035 PR China Key Laboratory of Science and Technology on Material Performance Evaluating in Space Environment School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 PR China

The electrochemical CO 2 reduction reaction is crucial for reducing atmospheric CO 2 and achieving carbon neutrality. Recent researches have predominantly focused on the development of high-performance catalysts, evaluating their performance remains time-consuming. Concurrently, in situ spectroscopic techniques have been instrumental in elucidating catalytic mechanisms and fundamental reaction pathways. In this study, we employ constant potential ab initio molecular dynamics simulations to precisely model the adsorption behavior of CO 2 molecules on Cu–Ag alloy surfaces, with a particular focus on tracking variations in the bond angles of the adsorbed CO 2 . By generating 2600 unique spectral datasets, we leverage convolutional neural networks to extract key spectral features and train a deep learning model to predict the bond angles of adsorbed CO 2 based on the corresponding spectral information. Given that the bond angle of adsorbed CO 2 serves as a crucial descriptor of a catalyst's ability to activate CO 2 molecules, our approach demonstrates the efficacy of AI in predicting catalytic activity. Furthermore, we extend this model's applicability to Cu–Au and Cu–Zn alloys, establishing the potential for AI-driven preliminary catalyst screening based on spectral data. This methodology has the capacity to significantly accelerate the catalyst development pipeline by reducing the reliance on analyzing conventional experimental results manually.

关键词： Electrolytic reduction

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Color centers induced by proton exposure in aluminum oxide hollow particles

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AIP Conference Proceedings 2018年第1期2051卷

作者： V. I. Iurina V. V. Neshchimenko M. M. Mikhailov Chundong Li 1Space Materials Laboratory Amur State University Blagoveshchensk 675027 Russia 2Radiation and Space Materials Laboratory Tomsk State University of Control Systems and Radio-Electronics Tomsk 634050 Russia 3Key Laboratory of Science and Technology on Material Performance Evaluating in Space Environment Harbin Institute of Technology Harbin 150001 PR China

The effects of proton (E = 100 keV, F = 54×1015 cm–2) exposure on the reflective spectra of Al2O3 hollow particles in wavelength range from 250 to 2500 nm have been investigated. Hollow particles were obtained by deposition nanoparticles on polystyrene balls in chitosan solution with subsequent heat treatment. X-ray photoelectron spectra of the material were analyzed for the O1s peak before and after irradiation. It has been established that radiation stability of the hollow particles is higher than that of Al2O3 microparticles. This effect is caused by the low concentration of color centers in the hollow particle due to lack of material in the bulk of particles.

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Proton and electron irradiation effects on outgassing behaviors of polymers in vacuum and its mechanism

Proton and electron irradiation effects on outgassing behavi...

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12th International Symposium on materials in the space environment, ISMSE 2012

作者： Hai, Liu Bin, Shu Gang, Liu Yong, Liu Science and Technology on Material Performance Evaluating in Space Environment Laboratory Harbin Institute of Technology Harbin 150001 China

The effects of 160keV electron and 100keV proton on outgassing feature of DGEBA/DICY and dimethyl silicone rubber were investigated using a simulating facility of space radiation environment. Under radiation of electrons and protons, the mass loss of DGEBA/DICY exhibits an exponential increase with increasing irradiation fluence. The dimethyl silicone rubber shows higher irradiation stability than DGEBA/DICY. The mass loss of dimethyl silicone rubber has little change under electron irradiation, and increase under proton irradiation. The maximum mass loss of rubber is lower than that of DGEBA/DICY under the same irradiation condition. The in-situ analyses of mass spectrum and fourier infrared spectrum show that, the charged particles cause the breaking of C-C, C-H, C-N, and C-O, of which have lower binding energy in DGEBA/DICY, leading to degradation reaction and formation of small-molecular substance. The volatilization of the formed small-molecular substance enhances the outgassing process. The net structure produced by reaction of pendant group plays an obstacle role for outgassing. Cross-link reaction was found in the proton irradiated rubber. The partial degradation of molecular chain resulted from the irradiation induced bond breaking of Si-O facilitates the outgassing process. Copyright © 2013 European space Agency.

关键词： Electron irradiation

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The total organic content analysis and its long-term forecast method for manned spacecraft crew cabin materials

The total organic content analysis and its long-term forecas...

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64th International Astronautical Congress 2013, IAC 2013

作者： Xing, Guo Yi, Wang Yang, Shengsheng Zhuang, Jianhong Wang, Shuguang Yang, Qing Lanzhou Institute of Physics Space Technology Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory PO Box 94 Lanzhou Gansu Province 730000 China Lanzhou Institute of Physics Space Technology Science and Technology on Material Performance Evaluating in Space Environment Laboratory Gansu Lanzhou 730000 China

ISBN: (纸本)9781629939094

The organic materials used in in the crew module in a confined space degradation of volatile gas, most of these gases are volatile organic compounds(VOC), is an important source of air pollution. Therefore, the test total organic content is one important criteria of the evaluation of the toxicity of cabin material. Presently evaluation method of the toxicity are mostly concerned about the short-term manned space flight material outgassing toxicity. This paper provide a method for evaluating a long-term manned flight materials outgassing toxicity. Using the outgassing gas evaluation device of crew module to test a rubber which used in cabin. The test method according to the standard Q/W 1155-2008 Detecting method of hazard gas from non-metal materials in spacecraft crew module, collecting the outgassing products from materials in given condition, And quantitative analysis of the total organic content by gas chromatography. The method of quantitative analysis is n-pentane external standard quantitative. The results show that the test device developed background pollution to meet the design requirements, the infection for the test results can be ignored. The content of VOC for the rubber is 1.93g/g o Base on the effect of mechanism of temperature-time for the material outgassing, we give the method for estimate the total organic content in long-term manned flight.

关键词： Toxicity

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Evaluation and prediction of InGaP2/GaAs/Ge solar cell performance in space radiation environment

Evaluation and prediction of InGaP2/GaAs/Ge solar cell perfo...

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64th International Astronautical Congress 2013, IAC 2013

作者： Xin, Gao Yang, Sheng-Sheng Feng, Zhan-Zu Lei, Zhang Cui, Xinyu He, Yuanji Feng, Dongming Science and Technology on Vacuum and Cryogenics Technology Physics Laboratory Lanzhou Institute of Physics Lanzhou 730000 China Science and Technology on Material Performance Evaluating in Space Environment Laboratory China Lanzhou Institute of Physics Lanzhou 730000 China Tianj in Institute of Power Sources Tianjin 300381 China

ISBN: (纸本)9781629939094

The space radiation environment is mainly composed of electrons, protons or their combinations. Exposure to these charged particles typically degrades the electrical performance of semiconductor devices, especially less-shielded space solar array, thus limiting the lifetime of the solar array. Therefore, to be used in space, understanding the radiation response of solar cell is extremely important for accurate predictions of the expected mission lifetime. The effects of GEO (Altitude 35,870km, Inclination 0°), MEO (Altitude 21,500km, Inclination 55°) and LEO (Altitude 799km, Inclination 99°) radiation environments are investigated on the degradation of a new type InGaP 2/GaAs/Ge triple-junction solar cell (Manufactured in China). The on-ground irradiation experiments were performed to evaluate radiation effects of electrons and protons on the solar cells, and also to provide experimental data for predictions of the cell performances under the space radiation environments. For these cell types I-V characteristics were obtained as a function of radiation fluence using electrons (1.0, 1.5 and 2.0 MeV) and protons (3, 5, 8 and 10 MeV). Illuminated current-voltage (I-V) characteristics of each sample were measured both before and after irradiation using a Spectrolab X-25 solar simulator under AM0 condition (air mass zero, 1 sun, 25 °C conditions). The prediction results of the performance degradations of the GaAs cells are presented as a function of cell material, and cover glass, and the system orbit and lifetime in the space radiation environments, using the displacement damage dose methodology for analyzing and modeling. This study provides reference data for the design of the GaAs solar arrays in the typical space radiation environments to ensure the security and reliability of on-orbit spacecrafts. Copyright © 2013 by the International Astronautical Federation.

关键词： Gallium arsenide

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