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Ferrimagnetic m PEG-b-PHEP copolymer micelles loaded with iron oxide nanocubes and emodin for enhanced magnetic hyperthermia–chemotherapy

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national Science Review 2020年第4期7卷 723-736页

作者： Yonghong Song Dongdong Li Yang Lu Kun Jiang Yi Yang Yunjun Xu Liang Dong Xu Yan Daishun Ling Xianzhu Yang Shu-Hong Yu Key laboratory of Advanced Catalytic Materials and Reaction Engineering School of Chemistry and Chemical EngineeringKey Laboratory of Metabolism and Regulation for Major Diseases of Anhui Higher Education Institutes Hefei University of Technology Institutes for Life Sciences School of Medicine South China University of Technology Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellence in Nanoscience Hefei Science Center of CASDepartment of Chemistry Institute of Biomimetic Materials & Chemistry University of Science and Technology of China Zhejiang Province Key laboratory of Anti-Cancer Drug Research College of Pharmaceutical Sciences Key Laboratory of Biomedical Engineering of the Ministry of Education Zhejiang University

As a non-invasive therapeutic method without penetration-depth limitation, magnetic hyperthermia therapy(MHT) under alternating magnetic field(AMF) is a clinically promising thermal ***, the poor heating conversion efficiency and lack of stimulus–response obstruct the clinical application of magnetofluid-mediated MHT. Here, we develop a ferrimagnetic polyethylene glycol-poly(2-hexoxy-2-oxo-1,3,2-dioxaphospholane)(m PEG-b-PHEP) copolymer micelle loaded with hydrophobic iron oxide nanocubes and emodin(denoted as EMM). Besides an enhanced magnetic resonance(MR) contrast ability(r2= 271 m M-1s-1) due to the high magnetization, the specific absorption rate(2518 W/g at 35 k A/m) and intrinsic loss power(6.5 n Hm2/kg) of EMM are dozens of times higher than the clinically available iron oxide nanoagents(Feridex and Resovist), indicating the high heating conversion efficiency. Furthermore, this composite micelle with a flowable core exhibits a rapid response to magnetic hyperthermia, leading to an AMF-activated supersensitive drug release. With the high magnetic response, thermal sensitivity and magnetic targeting, this supersensitive ferrimagnetic nanocomposite realizes an above 70% tumor cell killing effect at an extremely low dosage(10 μg Fe/m L),and the tumors on mice are completely eliminated after the combined MHT–chemotherapy.

关键词： magnetic hyperthermia therapy sensitive thermal response chemotherapy magnetic targeting theranostics

Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 365-377页

作者： Chen Chen Jingwei Li Qiuxia Zuo Boyuan Ban Jian Chen Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key laboratory of Mineral Processing BGRIMM Technology GroupBeijing 100160China State Key laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650504China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of EducationHefei University of TechnologyHefei 230009China Shandong Aluminum Vocational College Weihai 264400China

To remove the key impurity elements,P and B,from primary Si simultaneously,Sr and Zr co-addition to Al-Si alloy systems during solvent refining has been *** reacts with Al,Si,and P in the melt to form a P-containing Al_(2)Si_(2)Sr phase and Zr reacts with B to form a ZrB_(2) *** the Al-Si-Sr-Zr system,high removal fractions of P and B in the primary Si,with 84.8%-98.4%and 90.7%-96.7%,respectively,are achieved at the same time,*** best removal effect is obtained in the sample with the addition of Sr-32000+Zr-3000μg·kg^(-1),and the removal fractions of P and B in the purified Si reach 98.4%and 96.1%.Compared with the Sr/Zr single-addition,the removal effects of Sr and Zr co-addition on P and B do not show a significant downward trend,indicating that the nucleation and growth of the B/P-containing impurity phases are mutually ***,an evolution model is proposed to describe the nucleation and the growth stages of Sr/Zr-containing compound phases,which reveals the interaction between the impurity phases and the primary Si.

关键词： Al2Si2Sr phase zirconium boride phase phase directional solidification solvent refining

Support induced phase engineering toward superior electrocatalyst

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Nano Research 2022年第3期15卷 1831-1837页

作者： Beibei Sheng Dengfeng Cao Hongwei Shou Oyawale Adetunji Moses Wenjie Xu Yujian Xia Yuzhu Zhou Huijuan Wang Ping Wan Shuang Zhu Wangsheng Chu Xiaojun Wu Shuangming Chen Li Song national Synchrotron Radiation laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China hefei national laboratory for Physical Sciences at the Microscales Department of Materials Sciences and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Experimental Center of Engineering and Material Science University of Science and Technology of ChinaHefei 230026China Materials Interfaces Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 440305China Institute of Energy Hefei Comprehensive Nation Science CenterHefei 230031China

The phase transformation of catalysts has been extensively observed in heterogeneous catalytic reactions that hinder the long cycling catalysis,and it remains a big challenge to precisely control the active phase during the complex conditions in electrochemical ***,we theoretically predict that carbon-based support could achieve the phase engineering regulation of catalysts by suppressing specific phase *** single-walled carbon nanotube(SWCNT)as typical support,combined with calculated E-pH(Pourbaix)diagram and advanced synchrotron-based characterizations technologies prove there are two different active phases source from cobalt selenide which demonstrate that the feasibility of using support effect regulating the potential advantageous ***,it is worth noting that the phase engineering derived Co_(3)O_(4)-SWCNT exhibits a low overpotential of 201 mV for delivering the current density of 10 mA/cm^(2)in electrocatalytic oxygen evolution reaction(OER).Also,it reaches a record current density of 529 mA/cm^(2)at 1.63 V(***)in the electrocatalytic urea oxidation reaction(UOR),overwhelming most previously reported catalysts.

关键词： phase engineering support synchrotron radiation characterization oxygen evolution reaction(OER) urea oxidation reaction(UOR)

2D-MOF/2D-MOF heterojunctions with strong hetero-interface interaction for enhanced photocatalytic hydrogen evolution

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Rare Metals 2023年第12期42卷 3993-4004页

作者： Yan Ma Hui-Xue Fang Rong Chen Qian Chen Sheng-Jun Liu Kui Zhang Hai-Jin Li School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243032China School of Chemistry and Chemical Engineering Anhui University of TechnologyMa'anshan 243032China School of Energy and Environment Anhui University of TechnologyMa'anshan 243002China

Metal organic framework(MOF) shows great potential in the research field of photocatalysis,and it is a big challenge to achieve efficient photocatalytic *** this work,we have successfully grown two-dimensional MOF(2D-MOF) nanosheets on 2D-MOF nanosheets for the first time using a homometallic nodal strategy,and successfully prepared ultrathin nanosheets with tightly bound 2D/2D heterojunctions.2D Ni-BDC nanosheets were used as carriers to grow 2D Ni-TCPP nanosheets on top of ***-TCPP has a high light absorption capacity,thus extending the light absorption range of 2D/2D *** tight coupling of the heterojunction effectively shortens the electron transfer distance,promotes the separation of interracial charges,and improves the photocatalytic ***,Ni-BDC/Ni-TCPP-3can achieve to a hydrogen production rate of428.0 μmol·g^(-1),approximately 5.75 times higher than NiBDC and 5.24 times higher than Ni-TCPP,***,2D-MOF/2D-MOF heterojunctions provide a promising strategy for enhancing photocatalytic performance through rational heterostructure design with homometallic node strategy.

关键词： Two-dimensional metal organic framework(2D MOF) Homometallic node strategy Heterojunction Photocatalytic

Highly enhanced visible-light photocatalytic hydrogen evolution on g-C_3N_4 decorated with vopc through π-π interaction

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Chinese Journal of Catalysis 2019年第2期40卷 168-176页

作者： Yanan Liu Liubo Ma Congcong Shen Xin Wang Xiao Zhou Zhiwei Zhao Anwu Xu Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at MicroscaleDepartment of Chemistry PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina College of Biological Chemical Science and Engineering Jiaxing UniversityJiaxing 314001ZhejiangChina

Photocatalytic H2 evolution reactions on pristine graphitic carbon nitrides(g-C3N4),as a promising approach for converting solar energy to fuel,are attractive for tackling global energy concerns but still suffer from low *** this article,we report a tractable approach to modifying g-C3N4 with vanadyl phthalocyanine(VOPc/CN)for efficient visible-light-driven hydrogen production.A non-covalent VOPc/CN hybrid photocatalyst formed viaπ-πstacking interactions between the two components,as confirmed by analysis of UV-vis absorption *** VOPc/CN hybrid photocatalyst shows excellent visible-light-driven photocatalytic performance and good *** optimal conditions,the corresponding H2 evolution rate is nearly 6 times higher than that of pure *** role of VOPc in promoting hydrogen evolution activity was to extend the visible light absorption range and prevent the recombination of photoexcited electron-hole pairs *** is expected that this facile modification method could be a new inspiration for the rational design and exploration of g-C3N4-based hybrid systems with strong light absorption and high-efficiency carrier separation.

关键词： VOPc/g-C3N4 π-πInteraction Visible light photocatalysis Hydrogen evolution Charge separation efficiency

Selective conformer detection of short-lived base pair tautomers: A computational study of the unusual guanine-cytosine pairs using ultrafast resonance Raman spectroscopy

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中国化学快报:英文版 2023年第10期34卷 252-258页

作者： Baoling Tian Yizhou Fang Shulai Lei Ke Xu Chaozheng He Shujuan Li Hao Ren College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural UniversityQingdao 266109China Hubei Key laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Institute of Chemistry Free University of BerlinArnimallee 22Berlin D-14195Germany Hubei Longzhong laboratory Xiangyang 441000China Institute of Environment and Energy Catalysis School of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an 710021China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China

Base pair mismatch has been regarded as the main source of DNA point mutations, where minor shortlived tautomers were usually involved. However, the detection and characterization of these unnatural species pose challenges to existing techniques. Here, by using systematic structural and ultrafast resonance Raman(RR) spectral analysis for the four possible conformers of guanine-cytosine base pairs, the prominent marker Raman bands were identified. We found that the hydrogen bonding vibrational region from 2300 cm^(-1) to 3700 cm^(-1) is ideal for the identification of these short live species. The marker bands provide direct evidence for the existence of the tautomer species, thus offering an effective strategy to detect the short-lived minor species. Ultrafast resonance Raman spectroscopy would be a powerful tool to provide direct evidence of critical dynamical details of complex systems involving protonation or tautomerization.

关键词： Guanine-cytosine pair Hydrogen bonding Tautomer Resonance Raman Vibronic coupling

Tuning the reaction path of CO_(2) electroreduction reaction on indium single-atom catalyst:Insights into the active sites

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Nano Research 2022年第5期15卷 4014-4022页

作者： Jiawei Zhang Gangming Zeng Lanlan Chen Wenchuan Lai Yuliang Yuan Yangfan Lu Chao Ma Wenhua Zhang Hongwen Huang College of Materials Science and Engineering Advanced Catalytic Engineer Research Center of the Ministry of EducationHunan UniversityChangsha 410082China hefei national laboratory for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China State Key Lab of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Modulating the local coordination structure of metal single-atom catalysts(SACs)is extensively employed to tune the catalytic activity,but rarely involved in regulating the reaction pathway which fundamentally determines the product ***,we report that the product selectivity of electrochemical CO_(2)reduction(CO_(2)RR)on the single-atom indium-NxC4-x(1≤x≤4)catalysts could be tuned from formate to CO by varying the carbon and nitrogen occupations in the first coordination ***,the optimal In SAC showed great promise for CO production with the maximum Faradic efficiency of 97%,greatly different from the reported In-based catalysts where the formate is the dominant *** experimental verifications and theoretical simulations reveal that the selectivity switch from formate to CO on In SACs originates from active sites shift from indium center to the indium-adjacent carbon atom,where the indium site favors formate formation and the indium-adjacent carbon site prefers the CO *** present work suggests the active sites in metal SACs may shift from the widely accepted metal center to surrounding carbon atoms,thereby offering a new implication to revisit the active sites for metal SACs.

关键词： CO_(2)reduction single atom catalysts coordination structure product selectivity active sites shift

Origin of the red luminescence in Sr_3Al_2O_6:Eu phosphor ——From the synergetic effects of Eu^(2+) and Eu^(3+)

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Journal of Rare Earths 2017年第2期35卷 127-134页

作者：陈雷张昭田云飞费米何良锐张平娟张文华 School of Materials Science and Engineering Hefei University of Technology School of Electrical and Electronic Engineering University of Science and Technology of Anhui national Synchrotron Radiation laboratory University of Science and Technology of China

In order to uncover the real origin of red luminescence from Sr_3Al_2O_6：Eu and the physical mechanisms that were involved in the dynamical process of luminescence, variant amount of Eu and Dy activated Sr_3Al_2O_6 phosphors were synthesized with the solid-state reaction and the combustion-assisted solid-state reaction, respectively, using the fine graphite powder or the mixed H^2＋N_2gases as a reducing agent. The phase was examined with XRD analysis and the photoluminescence properties were characterized by a fluorescence spectrometer. Although the phosphors possessed the same Sr_3Al_2O_6 phase, different emission colors（red or green） were obtained, relying on synthesis conditions. The simultaneous existence of Eu^2＋ and Eu^3＋ was not only observed in the emission and excitation spectra, but also identified with the near edge X-ray absorption fine structure spectroscopy（NEXAFS）.The mixed valence（higher than ＋2 and less than ＋3） of Eu may be related with the six different sites of Sr, whose effective valence ranged from ＋1.5058 to ＋2.2698, in the crystal lattice of Sr_3Al_2O_6 that could accommodate Eu. Moreover, the reduction of Eu^3＋ to forming Eu^2＋ depended on the amount of Eu^3＋ or Dy^3＋ doped, due to the different energy barrier in each site of Sr that Eu had to overcome. The residual Eu^3＋, similar to the doped Dy^3＋, played an important role in supplying the hole for Eu^2＋ to form a bound trap（Eu^2＋）＊ after excitation. During electron returning to the 4f^7 ground state of Eu^2＋, the red luminescence was radiated. Therefore, the synergetic effects of Eu^2＋ and Eu^3＋（Dy^3＋） produce red luminescence.

关键词： luminescence phosphor Sr_3Al_2O_6:Eu bond valence X-ray absorption fine structure spectroscopy(NEXAFS) trap

Quantitative Evaluation of Pseudo Strain Signals Caused by Yarn Structural Deformation

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Advanced Fiber Materials 2022年第2期4卷 214-225页

作者： Shihui Lin Leitao Cao Zhuochen Lv Jing Ren Shengjie Ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China

Yarn-based strain sensors(YSSs)have shown great promising in the fabrication of wearable devices for their good comfortability and fexible ***,the false signals generated by the changes in the yarn structure of the YSSs are usually *** this study,the generation,the characteristic,and the prediction of these signals were *** recognized that these signals are composed of two negative pseudo peaks and a spurious resistance response *** responses are found to have nothing in common with a true tensile strain,but be attributed to plastic deformation of the *** is due to the fact that the deformation of YSSs exceeds the linear elastic range of the *** the use of pure elastic fbers can eliminate the spurious resistance response plateau,it will lead to an increase in the pseudo peak to the value compared with a true strain signal ***,a theoretical model was established to decouple the real signals from the false responses,ensuring the high sensing accuracy of YSSs for applications in wearable devices and artifcial intelligence *** work provides an in-depth understanding of the response of the YSSs,which might provide inspiration and guidance in the design of high-accuracy fber-based strain sensors.

关键词： Textile strain sensor Pseudo-signal Structure-property relationship Contact resistance