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Temperature-feedback two-photon-responsive metal-organic frameworks for efficient photothermal therapy

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中国科学技术大学学报 2024年第6期54卷 53-59,I0011页

作者： xianshun sun Xin Lu Wenyao Duan Bo Li Yupeng Tian Dandan Li Hongping Zhou School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid MaterialsMinistry of EducationAnhui UniversityHefei 230601China

The realization of real-time thermal feedback for monitoring photothermal therapy(PTT)under near-infrared(NIR)light irradiation is of great interest and challenge for antitumor ***,by assembling highly efficient photothermal conversion gold nanorods and a temperature-responsive probe((E)-4-(4-(diethylamino)styryl)-1-methylpyridin-1-ium,PyS)within MOF-199,an intelligent nanoplatform(AMPP)was fabricated for simultaneous chemodynamic therapy and NIR light-induced temperature-feedback *** fluorescence intensity and temperature of the PyS probe are linearly related due to the restriction of the rotation of the characteristic monomethine ***,the copper ions resulting from the degradation of MOF-199 in an acidic microenvironment can convert H_(2)O_(2)into•OH,resulting in tumor ablation through a Fenton-like reaction,and this process can be accelerated by increasing the *** study establishes a feasible platform for fabricating highly sensitive temperature sensors for efficient temperature-feedback PTT.

关键词： metal-organic framework two-photon temperature feedback photothermal therapy chemodynamic therapy

Surface modification of ZnIn2S4 layers to realize energy-transfer-mediated photocatalysis

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National Science Review 2022年第10期9卷 120-125页

作者： xianshun sun Xiao Luo Sen Jin Xiaodong Zhang Hui Wang Wei Shao Xiaojun Wu Yi Xie Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Institute of Energy Hefei Comprehensive National Science Center

Photocatalytic selective aerobic oxidation reactions are crucial in designing advanced organic intermediates,but suffer from low conversion ***,activating1O2to create suitable reactive oxygen species,such as singlet oxygen(1O2),can significantly increase the yield of desired ***,using ZnIn2S4nanosheets as a model system,we build a surface-modified theoretical structure,where a surface-covered non-conductive macromolecular chain,polyvinyl pyrrolidone(PVP),is bound to ZnIn2S4and influences the O2adsorption *** on the surface significantly changes the electronic structure and suppresses electron conduction of ***,abundantly photogenerated and long-lived species transfer their energy to physically absorbed O2to efficiently generate1O2,which can oxidize sulphides into their corresponding *** sulphoxidation of different sulphides,surface modification brings a3-9-fold increase in conversion efficiency and high selectivities> 9 8 %.This study provides a feasible way of boosting1O2-generation-related photocatalytic reactions.

关键词： surface modification long-lived species energy transfer singlet oxygen photocatalytic sulphoxidation of sulphides

Visible light-driven superoxide generation by conjugated polymers for organic synthesis

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Nano Research 2018年第2期11卷 1099-1108页

作者： Feili Lai Yue Wang Dandan Li xianshun sun Juan Peng Xiaodong Zhang Yupeng Tian Tianxi Liu Hefei National Laboratory for Physical Science at Microscale Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of China Hefei China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai China Department of Chemistry Anhui University Hefei China State Key Laboratory of Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai China

Benefiting from their unique delocalized electronic structure, conjugated polymer-based semiconductors are widely applied in the fields of organic electronics, sensors, and biomedical applications. However, the photocatalytic properties of conjugated polymers have been seldom studied because of their unsuitable band structures. Herein, we creatively demonstrate that the band structures of conjugated polymers are strongly related to their degree of polymerization （DP）, offering an effective strategy for the design of metal-free photocatalysts with tunable light absorption properties. Taking poly（3- hexylthiophene）（PHT） as an example, we show that PHT nanofibers with a suitable DP are a novel visible light-driven photocatalyst, which can readily convert molecular oxygen into superoxide ions. Benefiting from the high selectivity of the generated superoxides, the PHT nanofibers display outstanding activity for the aerobic oxidation of amines into imines with nearly 100% conversion and selectivity. This study offers a new strategy for the design of advanced coniugated Dolvrner-based Dhotocatalvsts.

关键词： visible light poly(3-hexylthiophene)(PHT) superoxide selective aerobic oxidation photocatalysis

Surface modification boosts exciton extraction in confined layered structure for selective oxidation reaction

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Science China Chemistry 2021年第11期64卷 1964-1969页

作者： Sen Jin Hui Wang Lei Li Xiao Luo xianshun sun Ming Zuo Jie Tian Xiaodong Zhang Yi Xie Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei230026China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Extracting photogenerated species from bulk to surface is an essential process for gaining efficient semiconductor-based ***,compared with charged photogenerated carriers,neutral exciton exhibits negligible response to electric ***,traditional strategies involving band-alignment construction for boosting directional transfer of charge carriers are impracticable for extracting bulk *** this issue,we here propose that the extraction of bulk exciton could be effectively implemented by surface *** taking confined layered bismuth oxycarbonate(Bi_(2)O_(2)CO_(3))as an example,we highlight that the incorporation of iodine atoms on the surface could modify the micro-region electronic structure and hence lead to reduced energy of surface excitonic *** from the energy gradient between bulk and surface excitonic states,iodine-modified Bi_(2)O_(2)CO_(3)possesses high-efficiency bulk exciton extraction,and hence exhibits promoted performance in triggering1 O2-mediated selective oxidation *** work presents the positive role of surface modification in regulating excitonic processes of semiconductor-based photocatalysts.

关键词： exciton extraction selective oxidation reaction photocatalytic

Interface boosted highly efficient selective photooxidation in Bi_(3)O_(4)Br/ Bi_(2)O_(3) heterojunctions

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eScience 2023年第2期3卷 77-82页

作者： xianshun sun Lei Li Sen Jin Wei Shao Hui Wang Xiaodong Zhang Yi Xie Hefei National Research Center for Physical Sciences at Microscale University of Science and Technology of ChinaHefeiAnhui 230026PR China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031PR China

Selective photooxidation of amines to biologically important imines is in great demand for industrial *** conversion efficiency and selectivity of the process are strongly dependent on the activation of photocatalytic molecular oxygen(O_(2))into reactive oxygen ***,we propose the construction of rich interfaces to boost photocatalytic O_(2) activation by facilitating the transfer of *** Bi_(3)O_(4)Br/Bi_(2)O_(3) heterojunctions as an example,rich interfaces facilitate electron transfer to adsorbed O_(2) for superoxide(O_(2)⋅^(-))generation,thus achieving≥98%conversion efficiency and selectivity for benzylamine and benzylamine *** study offers a valid method to design advanced photocatalysts for selective oxidation reactions.

关键词： Interface Heterojunction Superoxide radical Selective photooxidation Imines

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活性氧物种在光催化选择性氧化中的研究进展

化学通报 2021年第1期84卷 16-20页

作者：孙贤顺张晓东中国科学技术大学应用化学系合肥230026

活性氧物种(ROS)在光催化选择性氧化过程中起着至关重要的作用。研究人员通过调控材料结构,优化其ROS产生的种类及浓度,可以有效提高相应光催化选择氧化反应的效率,为实现未来绿色工业搭桥铺路。本文将对常见的ROS产生过程进行解读,同... 详细信息

活性氧物种(ROS)在光催化选择性氧化过程中起着至关重要的作用。研究人员通过调控材料结构,优化其ROS产生的种类及浓度,可以有效提高相应光催化选择氧化反应的效率,为实现未来绿色工业搭桥铺路。本文将对常见的ROS产生过程进行解读,同时阐明其在各个催化反应中的作用机制,最后介绍不同ROS的检测和验证方法。本文可为光催化反应的优化提供新的思路。

关键词：活性氧物种光催化反应超氧自由基单线态氧羟基自由基

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棉花圆模成型装置的设计与优化分析

农机化研究 2023年第1期45卷 51-57页

作者：孙显顺刘亮东王德成何雄林郑奎华马治国胡佳宁中国农业大学工学院北京100083 石家庄鑫农机械有限公司石家庄052463

设计了一种棉花圆模成型装置,可以对棉花进行均匀喂棉、打捆成型、缠网及断网作业。对喂棉装置、成型装置、缠网送网装置、切网装置等关键部件进行设计与分析,以保证装置的合理性。进行传动方案设计,并对输棉传送带的速度与密实度调节... 详细信息

设计了一种棉花圆模成型装置,可以对棉花进行均匀喂棉、打捆成型、缠网及断网作业。对喂棉装置、成型装置、缠网送网装置、切网装置等关键部件进行设计与分析,以保证装置的合理性。进行传动方案设计,并对输棉传送带的速度与密实度调节辊的速度关系进行了理论推导,保证装置能正常工作。利用SolidWorks对棉花圆模成型装置进行三维建模,并对成型装置进行静力学分析,结果表明:成型装置在正常工作下的最大位移是0.006 m,最大应力是6.57MPa,远低于屈服强度。对成型装置进行试验,结果表明:棉花圆模成型装置能满足各项作业要求,且工作稳定,可以为棉花圆模成型装置进一步优化设计提供理论参考。

关键词：圆模成型装置打捆缠网送网静力学分析棉花

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Mid-infrared broadband optical frequency comb generated in MgF_2 resonators

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Photonics Research 2022年第8期10卷 1931-1936页

作者： WEI WU QIBING sun YI WANG YU YANG xianshun MING LEI SHI KEYI WANG WEI ZHAO LEIRAN WANG State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China

Microresonator-based optical frequency combs are broadband light sources consisting of equally spaced and coherent narrow lines,which are extremely promising for applications in molecular spectroscopy and sensing in the mid-infrared(MIR)spectral *** are still great challenges in exploring how to improve materials for microresonator fabrication,extend spectral bandwidth of parametric combs,and realize fully stabilized soliton MIR frequency ***,we present an effective scheme for broadband MIR optical frequency comb generation in a MgF_(2) crystalline microresonator pumped by the quantum cascade *** spectral evolution dynamics of the MIR Kerr frequency comb is numerically investigated,revealing the formation mechanism of the microresonator soliton comb via scanning the pump-resonance *** also experimentally implement the modulation instability state MIR frequency comb generation in MgF_(2) resonators covering from 3380 nm to 7760 *** work proceeds microresonator-based comb technology toward a miniaturization MIR spectroscopic device that provides potential opportunities in many fields such as fundamental physics and metrology.

关键词： soliton comb narrow

稀土Gd掺杂对锆基块体非晶合金玻璃形成能力及力学性能的影响

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金属学报 2009年第2期45卷 243-248页

作者：孙亚娟魏先顺黄永江沈军哈尔滨工业大学材料科学与工程学院哈尔滨150001

适量的Gd掺杂可提高Zr_(50.7)Cu_(28)Ni_9Al_(12.3)块体非晶合金的玻璃形成能力,当Gd元素掺杂量(原子分数)为1%时,即(Zr_(50.7)Cu_(28)Ni_9Al_(12.3))_(99)Gd_1,柱状非晶合金直径可达16 mm(不掺杂时为14 mm).稀土Gd掺杂降低了锆基块体非晶合金的断裂强度与塑性变形能力.随着Gd含量的增加,其断裂方式由单一的剪切断裂转变为剪切断裂与破碎断裂的复合形式,且含Gd元素掺杂的非晶合金断口呈现了脉状纹络与纳米周期性条纹共存的特征.

关键词：锆基块体非晶合金玻璃形成能力力学性能