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Flexible interdigitated layered framework with multiple accessible active sites for high-performance ch_(3)I capture

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Science china chemistry 2024年第5期67卷 1569-1577页

作者： Bo Tai Baoyu Li Linwei He Zhonglin Ma Shujing Lin Mingxing zhang Junchang chen Fuqi Wu Long chen Xing Dai Fuyin Ma Zhifang chai Shuao Wang State Key Laboratory of Radiation Medicine and Protection School for Radiological and interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China

The development of adsorbent materials for effective capture of radioactive iodomethane(ch_(3)I) from the off-gas of used nuclear fuel reprocessing, remains a significant and challenging line of research because currently state-of-art adsorbents still suffer from low binding affinity with ch_(3)I. Here, we proposed a brand-new adsorption topological structure by developing a 2D interdigitated layered framework, named SCU-20, featuring slide-like channel with multiple active sites for ch_(3)I capture. The responsive rotating-adaptive aperture of SCU-20 enables the optimal utilization of all active sites within the pore for highly selective recognition and capture of ch_(3)I. A record-breaking ch_(3)I uptake capacity of 1.84 g/g was achieved under static sorption conditions with saturated ch_(3)I vapor. Both experimental and theoretical findings demonstrated that the exceptional uptake of SCU-20 towards ch_(3)I can be attributed to the confined physical electrostatic adsorption of F sites, coupled with the chemical nitrogen methylation reaction with uncoordinated N atoms of pyrazine. Moreover, dynamic ch_(3)I uptake capacity potentially allows for the capture of ch_(3)I in simulated real-world off gas reprocessing conditions. This study highlights the potential of SCU-20 as a promising candidate for efficient capture of iodine species and contributes to the development of effective solutions for radioactive iodine remediation.

关键词： 2D interdigitated layered framework iodomethane dual-sites electrostatic interaction physisorption and chemisorption

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White light emission in 0D halide perovskite[(ch_(3))_(3)S]_(2)SnCl_(6)·H_(2)O crystals through variation of doping ns^(2) ions

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Frontiers of Optoelectronics 2024年第1期17卷 57-66页

作者： Yitong Lin Yu Zhong Yangpeng Lin Jiawei Lin Lei Pang Zhilong zhang Yi Zhao Xiao‑Ying Huang Ke‑Zhao Du Fujian Provincial Key Laboratory of Advanced Materials Oriented chemical Engineering Collage of Chemistry and Material ScienceFujian Normal UniversityFuzhou 350007China State Key Laboratory of Structural chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Qinghai Environmental Monitoring Center Xining 810000China Strait Institute of Flexible Electronics(SIFE Future Technologies)Fujian Normal University and Strait Laboratory of Flexible Electronics(SLoFE)Fuzhou 350007China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

With the rapid development of white LEDs,the research of new and efficient white light emitting materials has attracted increasing *** dimensional(0D)organic–inorganic hybrid metal halide perovskites with superior luminescent property are promising candidates for LED application,due to their abundant and tailorable ***,[(ch_(3))_(3)S]_(2)SnCl_(6)・H_(2)O is synthesized as a host for dopant ions Bi^(3+)and Sb^(3+).The Sb^(3+)doped,or Bi^(3+)/Sb^(3+)co-doped,[(ch_(3))3S]_(2)SnCl_(6)・H_(2)O has a tunable optical emission spectrum by means of varying dopant ratio and excitation *** a result,we can achieve single-phase materials suitable for emission ranging from cold white light to warm white *** intrinsic mechanism is examined in this work,to clarify the dopant effect on the optical *** high stability of title crystalline material,against water,oxygen and heat,makes it promising for further application.

关键词： 0D Metal halide White light Perovskite Ions doping Excitation dependent

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基于跨模态注意力和门控单元融合网络的多模态情感分析方法

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数据分析与知识发现 2024年第7期8卷 67-76页

作者：陈岩松张乐张雷瀚吕学强北京信息科技大学网络文化与数字传播北京市重点实验室北京100101 北京信息科技大学计算机学院北京100101 北京邮电大学经济管理学院北京100876

【目的】针对当前多模态情感分析中模态融合与交互不充分、多模态特征提取不完全的问题,提出一种基于跨模态注意力和门控单元融合网络的多模态情感分析方法。【方法】在多模态特征提取方面,增加视频模态中人物微笑程度特征和人物头部姿... 详细信息

【目的】针对当前多模态情感分析中模态融合与交互不充分、多模态特征提取不完全的问题,提出一种基于跨模态注意力和门控单元融合网络的多模态情感分析方法。【方法】在多模态特征提取方面,增加视频模态中人物微笑程度特征和人物头部姿势特征,丰富了多模态数据的底层特征;在模态融合方面,利用跨模态注意力机制使模态内部以及模态之间的信息进行更充分的交互,利用门控单元融合网络去除冗余信息,并通过自注意力机制分配注意力权重;最后,通过全连接层输出最终情感分类结果。【结果】在中文公开数据集ch-SIMS上与先进的Self-MM模型进行对比,实验结果表明,本文提出的方法在二分类准确率、三分类准确率和F1值上分别提升2.22、2.04和1.49个百分点。【局限】视频中人物的肢体动作在不断变化,不同的肢体动作蕴含不同的情感信息,模型没有考虑到人物在视频中的肢体动作信息。【结论】本文丰富了多模态数据的底层特征,有效实现模态融合,提升了情感分析的效果。

关键词：多模态情感分析注意力机制门控机制特征融合

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Recent advances in p-block metal chalcogenide electrocatalysts for high-efficiency CO_(2) reduction

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eScience 2024年第2期4卷 43-56页

作者： Fanrong chen Ze-cheng Yao Zhen-Hua Lyu Jiaju Fu Xiaoling zhang Jin-Song Hu Beijing National Laboratory for Molecular Sciences(BNLMS) Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China College of chemistry&chemical Engineering Yan'an UniversityShaanxi Key Laboratory of Chemical Reaction EngineeringYan'an 716000China School of chemistry and chemical Engineering Beijing Institute of TechnologyBeijing 100081China University of chinese Academy of Sciences Beijing 100049China

Electrocatalytic CO_(2) reduction(ECR)to high-value fuels and chemicals offers a promising conversion technology for achieving sustainable carbon *** recent years,although great efforts have been made to develop highefficiency ECR catalysts,challenges remain in achieving high activity and long durability *** advantage of the adjustable structure,tunable component,and the M–ch(M¼Sn,In,Bi,etc.,ch¼S,Se,Te)covalent bonds stabilized metal centers,the p-block metal chalcogenides(PMC)based electrocatalysts have shown great potential in converting CO_(2) into CO or *** addition,the unique p-block electron structure can suppress the competitive hydrogen evolution reaction and enhance the adsorption of ECR *** to systematically understand the structure–activity relationship of PMC-based ECR catalysts,this review summarizes the recent advances in designing PMC electrocatalysts for CO_(2) reduction based on the fundamental aspects of heterogeneous ECR process,including advanced strategies for optimizing the intrinsic activity and improving the loading density of catalytic sites,constructing highly stable catalysts,and tuning product.

关键词： Electrocatalytic CO_(2)reduction P-block metal chalcogenides Catalyst design strategies High-performance electrocatalysts

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MoO_(x) and V_(2)O_(x) as hole and electron transport layers through functionalized intercalation in normal and inverted organic optoelectronic devices

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Light(Science & Applications) 2015年第1期4卷 415-421页

作者： Xinchen Li Fengxian Xie Shaoqing zhang Jianhui Hou Wallace ch choy Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongChina Institute of chemistry Chinese Academy of SciencesBeijing 100190China

To achieve fabrication and cost competitiveness in organic optoelectronic devices that include organic solar cells(OSCs)and organic light-emitting diodes(OLEDs),it is desirable to have one type of material that can simultaneously function as both the electron and hole transport layers(ETLs and HTLs)of the organic devices in all device architectures(i.e.,normal and inverted architectures).We address this issue by proposing and demonstrating Cs-intercalated metal oxides(with various Cs mole ratios)as both the ETL and HTL of an organic optoelectronic device with normal and inverted device *** results demonstrate that the new approach works well for widely used transition metal oxides of molybdenum oxide(MoOx)and vanadium oxide(V_(2)O_(x)).Moreover,the Cs-intercalated metaloxide-based ETL and HTL can be easily formed under the conditions of a room temperature,water-free and solution-based *** conditions favor practical applications of OSCs and ***,with the analyses of the Kelvin Probe System,our approach of Cs-intercalated metal oxides with a wide mole ratio range of transition metals(Mo or V)/Cs from 1:0 to 1:0.75 can offer significant and continuous work function tuning as large as 1.31 eV for functioning as both an ETL and ***,our method of intercalated metal oxides can contribute to the emerging large-scale and low-cost organic optoelectronic devices.

关键词： metal oxides carrier transport layers normal and inverted device architectures organic light-emitting diodes organic solar cells room-temperature solution process

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A New chirality Invertible Photoswitch:Light-Driven Axially chiral Hydrazone Enabling Dynamic Handedness Inversion of Self-Organized Helical Superstructure

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CCS chemistry 2024年第8期6卷 2011-2020页

作者： Ruochen Lan Jinying Bao Zhaozhong Li Zizheng Wang Zichen Wang Qian Wang Lanying zhang Jiumei Xiao Huai Yang Institute of Advanced Materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022 Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringPeking UniversityBeijing 100871 School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083 Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083 Key Laboratory of Polymer chemistry and Physics of Ministry of Education Peking UniversityBeijing 100871 School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083

Inspired by nature,dynamic self-organized helical superstructures are becoming attractive as building blocks in soft photonic crystals and advanced chiroptical ***,a chirality invertible hydrazone photoswitch,possessing high helical twisting power(HTP)was judiciously designed and *** to the photoinduced configuration changes of the hydrazone photoswitch,it displayed superior thermal stability and strikingly reversible HTP *** incorporating a novel chiral hydrazone(ch)into the liquid crystal(LC)host,a handedness invertible cholesteric liquid crystal(CLC)helical superstructure with high thermal stability and light-modulated photonic bandgap was *** inferred that the mechanism of chirality inversion of the novel ch photoswitch derived from changes in the dihedral angle between the two naphthalene rings induced by hydrazone ***,the influence of chemical structures on its photoresponsiveness was ***,the potential applications of this advanced light-driven CLC in soft photonic crystals,showing erasable and rewritable colorful patterns and chiroptical templates to induce handedness invertible circularly polarized luminescence were illustrated.

关键词： chirality inversion hydrazone photoswitch cholesteric liquid crystals dynamic photonic crystals dynamic circularly polarized luminescence

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One-neutron stripping process in the^(209)Bi(^(6)Li,^(5)Li)^(210)Bi*reaction reaction

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Nuclear Science and Techniques 2024年第6期35卷 120-129页

作者： Gao-Long zhang Zhen-Wei Jiao Guang-Xin zhang E.N.Cardozo B.Paes Shi-Peng Hu Jian-Qiang Qian Daniele Mengoni Wei-Wei Qu Cong-Bo Li Yun Zheng Huan-Qiao zhang Hui-Bin Sun Nan Wang chun-Lei zhang J.J.Valiente-Dobón D.Testov M.Mazzocco A.Gozzelino C.Parascandolo D.Pierroutsakou M.La Commara A.Goasduff D.Bazzacco D.R.Napoli F.Galtarossa F.Recchia A.Illana S.Bakes I.Zanon S.Aydin Gde Angelis M.Siciliano R.Menegazzo S.M.Lenzi S.Akkoyun L.F.Canto J.Lubian School of Physics Beihang UniversityBeijing 100191China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Instituto de Física Universidade Federal Fluminense24210-340 NiteróiRio de JaneiroBrazil Laboratorio TANDAR Comisión Nacional de Energía AtómicaBKNA1650 San MartíınArgentina Institute for Advanced Study in Nuclear Energy and Safety Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Research and Manufacture of High Purity Germanium Materials and Fetectors Shenzhen UniversityShenzhen 518060China INFN Sezione di PadovaPaduaItaly Dipartimento di fisica Astronomia dell’Universita di padova PaduaItaly State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China china Institute of Atomic Energy Beijing 102413China The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Laboratori Nazionali di Legnaro INFN35020 LegnaroItaly INFN Sezione di Napoli80126 NaplesItaly Dipartimento di Farmacia Universitàdi Napoli“Federico II”80131 NaplesItaly Department of Natural and Mathematical Sciences Faculty of EngineeringTarsus University33480 MersinTurkey Physics Division Argonne National LaboratoryLemontILUSA Department of Physics Sivas Cumhuriyet UniversitySivasTurkey Instituto de Física Universidade Federal do Rio de JaneiroRio de Janeiro CP 6852821941-972Brazil

One-neutron stripping process between^(6)Li and^(209)Bi was studied at 28,30,and 34 MeV using the in-beamγ-ray spectroscopy ***γ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long-lived isomeric states,which were employed to determine the cross *** one-neutron stripping cross sections were similar to the cross sections of complete fusion in the^(6)Li+^(209)Bi system,but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region.A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in^(6)*** calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism,and the valence proton of 209Bi can be excited to the low-lying excited state in(^(6)Li,^(5)Li)reaction,unlike in the(d,p)reaction.

关键词： Transfer reaction Weakly bound nuclei Cross section

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Thickening progression mechanism of silica fume-oil well cement composite system at high temperatures

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Petroleum Science 2024年第4期21卷 2793-2805页

作者： Hang zhang Miao-Miao Hu Peng-Peng Li Guo-Qing Liu Qing-Lu chang Jie Cao Ming Liu Wen-Hua Xu Xiu-Jian Xia Jin-Tang Guo School of chemical Engineering and Technology Tianjin University Zhejiang Institute of Tianjin University Haihe Laboratory of Sustainable chemical Transformations CNPC Engineering Technology R&D Company Limited

This work studied the thickening progression mechanism of the silica fume-oil well cement composite system at high temperatures(110-180.C) in order to provide a theoretical guidance for the rational application of silica fume in the cementing engineering. Results showed that silica fume seldom affected the thickening progression of oil well cement slurry at 110-120.C, but when temperature reached above130.C, it would aggravate the bulging degree of thickening curves and significantly extend the thickening time, meanwhile causing the abnormal “temperature-based thickening time reversal” and“dosage-based thickening time reversal” phenomena in the range of 130-160.C and 170-180.C respectively. At 130-160.C, the thickening time of oil well cement slurry was mainly associated with the generation rate of calcium hydroxide(ch) crystal. The introduced silica fume would be attracted to the cement minerals' surface that were hydrating to produce ch and agglomerate together to form an“adsorptive barrier” to hinder further hydration of the inner cement minerals. This “adsorptive barrier”effect strengthened with the rising temperature which extended the thickening time and caused the occurrence of the “temperature-based thickening time reversal” phenomenon. At 170-180.C, the pozzolanic activity of silica fume significantly enhanced and considerable amount of C-S-H was generated, thus the “temperature-based thickening time reversal” vanished and the “dosage-based thickening time reversal” was presented.

关键词： Silica fume Oil well cement Thickening time reversal Pozzolanic reaction Adsorptive barrier ch and C−S−H

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济南市夏季典型臭氧污染过程VOCs组分特征及来源分析

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环境科学 2024年第7期45卷 3828-3838页

作者：张桂芹张俊骁张淼张凤菊孙友敏刘仕杰杜琪玥魏小锋山东建筑大学市政与环境工程学院济南250101 山东省生态环境监测中心济南250101 山东建筑大学资源与环境创新研究院济南250101 山东科技大学安全与环境工程学院青岛266590

基于2021年6月16~26日济南市一次典型臭氧(O_(3))污染过程,结合107种VOCs监测数据,以山区背景点做参照,分析了市区在不同污染时期(清洁期CP、污染上升期PRP、重污染期HPP和污染下降期PDP)O_(3)及其前体物挥发性有机物(VOCs)的变化特征,... 详细信息

基于2021年6月16~26日济南市一次典型臭氧(O_(3))污染过程,结合107种VOCs监测数据,以山区背景点做参照,分析了市区在不同污染时期(清洁期CP、污染上升期PRP、重污染期HPP和污染下降期PDP)O_(3)及其前体物挥发性有机物(VOCs)的变化特征,并运用正定矩阵因子分解模型(PMF)和箱式模型(OBM)识别VOCs的主要来源和O_(3)生成机制及敏感性物种.结果表明,市区HPP期ρ(O_(3)-8h)均值为(246.67±11.24)μg·m^(-3),ρ(O_(3)-1h)峰值为300μg·m^(-3),VOCs体积分数和NO_(2)浓度受边界层高度和风速降低影响,分别高出其它3个时期76.99%~145.36%和127.78%~141.18%,是O_(3)污染加重的主要原因.市区VOCs中烷烃、含氧挥发性有机物(OVOCs)和卤代烃占比较大,为43.81%、20.98%和17.43%,三者在HPP期增长明显,丙酮、丙烷和乙烷各时期均为体积分数前3物种,异戊烷HPP期增长最多;臭氧生成潜势(OFP)占比较大的有烯烃、烷烃和芳香烃,为40.19%、28.06%和21.92%,1-丁烯、甲苯、异戊烷和异戊二烯是OFP较高的物种,异戊二烯在PRP期最高,除此以外均为1-丁烯最高,异戊烷HPP期受体积分数影响OFP明显升高.VOCs与CO相关系数初步表明机动车尾气与油气挥发是HPP期VOCs主要来源,进一步采用PMF发现溶剂使用源、燃烧源、机动车尾气+油气挥发源、工业排放源和植物源是市区VOCs的重要来源,其中HPP期机动车尾气+油气挥发源对VOCs的贡献高出其他时期3.09~14.72倍,溶剂使用源对VOCs的贡献是CP期和PRP期的2.50倍左右,说明机动车尾气+油气挥发源和溶剂使用源是造成VOCs体积分数增长的主要来源.潜在源和浓度权重分析发现VOCs还受东北方向滨州和东营传输的影响.OBM结果表明,市区O_(3)生成主要路径为过氧化羟基自由基(HO_(2)·)和甲基过氧自由基(ch_(3)O_(2)·)两者与NO反应,HPP期臭氧净生成速率[P(O_(3))net]为24×10^(-9)h^(-1),敏感性实验表明O_(3)生成对VOCs中的烯烃组分最敏感,1-丁烯、丙烯、顺-2-丁烯和乙烯是O_(3)生成的优控物种.

关键词：臭氧(O_(3)) 挥发性有机物(VOCs) 来源解析污染过程 OBM模型

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二次铝灰资源化研究进展

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稀有金属 2024年第2期48卷 277-287页

作者：刘颖张俊杰沈汉林张深根北京科技大学新材料技术研究院北京100083 北京科技大学顺德研究生院广东佛山528399

二次铝灰是熔铝产生的熔渣经提铝后产生的,由金属铝、氧化铝、氮化铝和盐类精炼剂等组成,因具有反应性和毒性被列为HW48危险废物,其无害化处置与资源化利用是亟需解决的难题。二次铝灰具有危险性是由于存在氮化铝和盐类精炼剂,其处置技... 详细信息

二次铝灰是熔铝产生的熔渣经提铝后产生的,由金属铝、氧化铝、氮化铝和盐类精炼剂等组成,因具有反应性和毒性被列为HW48危险废物,其无害化处置与资源化利用是亟需解决的难题。二次铝灰具有危险性是由于存在氮化铝和盐类精炼剂,其处置技术分为湿法、火法和湿法-火法联合3种工艺。湿法是采用水解氮化铝回收氨气、溶解并回收盐类精炼剂,最后得到氧化铝;火法是二次铝灰经熔融或煅烧分解氮化铝和盐类精炼剂,制备建筑材料或耐火材料。综述了二次铝灰的理化特性、环境危害、资源化技术,展望了二次铝灰研发和产业化的发展方向,为二次铝灰的资源化利用提供了参考。

关键词：二次铝灰资源化利用湿法工艺火法工艺建材化

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