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17.1%-Efficiency organic photovoltaic cell enabled with two higher-LUMO-level acceptor guests as the quaternary strategy

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Science China Chemistry 2020年第4期63卷 490-496页

作者： Kun Li Yishi Wu Xuemei Li Hongbing Fu Chuanlang Zhan Department of Chemistry Capital Normal UniversityBeijing 100048China School of Chemistry&Chemical Engineering Linyi UniversityLinyi 276000China CAS Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China

Quaternary blended organic solar cells utilize four blended material components(one donor plus three acceptors, two donors and two acceptors, or three donors plus one acceptor) as the active layer materials. The use of four material components allows us to have more material selections and more mechanism choices to improve the photon-to-electron conversion efficiency. In this contribution, we present a new case of quaternary material system, that shows 17.1% efficiency obtained by adding IDIC and PC71BM as the guest acceptors of the host binary of PM6:Y6. The lowest unoccupied molecular orbital(LUMO) levels of IDIC and PC71BM are both higher than that of Y6, which is one reason to obtain increased open-circuit voltage(Voc) in the quaternary device. Upon introduction of IDIC and PC71BM as the acceptor guests, the hole and electron mobilities are both increased, which contributes to the increased short-circuit current-density(Jsc). Effects of the weight ratios of the three acceptor components are investigated, which demonstrates that the increased hole and electron mobilities, the accelerated hole-transfer, and the reduced monomolecular recombination are the factors contributing to the increased Jscand fill-factor. This case of quaternary device demonstrates the applicability of the quaternary strategy in increasing the device functions and hence the efficiencies in the field of organic photovoltaic cells.

关键词： quaternary solar cell organic photovoltaic small-molecule acceptor nonfullerene fullerene

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The construction of drug-resistant cancer cell lines by CRISPR/Cas9 system for drug screening

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Science Bulletin 2018年第21期63卷 1411-1419页

作者： Lingmin Zhang Ying Li Qinghua Chen Yong Xia Wenfu Zheng Xingyu Jiang CAS Center for Excellence in Nanoscience Beijing Engineering Research Center for BioNanotechnologyCAS Key Laboratory for Biological Effects of Nanomaterials and NanosafetyNational Center for NanoScience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Laboratory of Molecular Target &Clinical Pharmacology School of Pharmaceutical Sciences and the Third &Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhou 511436China

Cancer therapy is often hampered by the rapid emergence of drug resistance. Drug-resistant cellular models are essential for understanding the drug resistance and developing new therapeutics. The low efficiency and long time required in creating these models are major obstacles hindering drug resistance research and drug screening. Herein, we report an approach that can accelerate(shortening the time from years to 3 weeks) the establishment of cancer cell line-based, inheritable drug resistance models by specific knockout of MED12 gene using CRISPR/Cas9 system. The resultant MED12^(KO) A375(melanoma)cell line was resistant to inhibitors of B-Raf proto-oncogene, serine/threonine kinase(BRAF), whereas the resultant MED12^(KO) PC9(non-small cell lung cancer) cell line was resistant to inhibitors of epidermal growth factor receptor(EGFR). Evaluation of anti-cancer drugs and their combinations shows that certain combinations of BRAF inhibitors and TGF-β receptor(TGF-βR) inhibitors are active in suppressing the growth of MED12^(KO) A375 cells, and a few combinations of EGFR inhibitors and TGF-βR inhibitors were active in suppressing the growth of MED12^(KO) PC9 cells. The drug-resistant models will be useful in screening novel drugs and drug combinations for multi-drug-resistant cancer therapy.

关键词： CRISPR/Cas9 Drug resistance Cancer cell line Gene editing

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A microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode for efficient solar energy storage

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Science China(Technological Sciences) 2019年第9期62卷 1628-1635页

作者： LIN YingYing FENG Hao CHEN Rong YE DingDing ZHANG Biao YU YouXu LI JinWang Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University) Ministry of EducationChongqing 400030China Institute of Engineering Thermophysics School of Energy and Power EngineeringChongqing UniversityChongqing 400030China

The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass ***, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.

关键词： Ti2O3 full spectrum response microfluidic all-vanadium photoelectrochemical cell solar energy storage vanadium ion conversion rate

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cell number explains the intraspecific spur-length variation in an Aquilegia species

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Plant Diversity 2019年第5期41卷 307-314页

作者： Zhi-Li Zhou Yuan-Wen Duan Yan Luo Yong-Ping Yang Zhi-Qiang Zhang Institute of Tibetan Plateau Research at Kunming Kunming Institute of BotanyChinese Academy of SciencesKunming650201China University of Chinese Academy of Sciences Beijing 100049China Gardening and Horticulture Department Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla666303China Laboratory of Ecology and Evolutionary Biology Yunnan UniversityKunming650091China

Variations of nectar spur length allow pollinators to utilize resources in novel ways,leading to the different selective pressures on spurs and allowing taxa to ***,the mechanisms underlying spur length variation remain *** comparisons of spur length suggest that both cell division and anisotropic expansion could explain the changes of spur length,and that hormone-related genes contribute to the process of spur *** contrast,little is known about intraspecific spur length *** Aquilegia rockii,spur length varies strikingly,ranging from 1 mm to 18 *** examine the potential mechanisms underlying spur length variation in ***,we observed cell morphology and analyzed RNA-seq of short-and long-spurred *** electron microscopy revealed that at two positions on spurs there were no differences in either cell density or cell anisotropy between short-and long-spurred flowers,suggesting that in *** changes in cell number may explain variations in spur *** addition,we screened transcriptomes of short-and long-spurred flowers for differentially expressed genes;this screen identified several genes linked to cell division(e.g.,F-box,CDKB2-2,and LST8),a finding which is consistent with our analysis of the cellular morphology of ***,we did not find any highly expressed genes involved in the hormone pathway in long-spurred *** contrast to previous hypotheses that anisotropic cell expansion leads to interspecific spur variation in Aquilegia,our results suggest that cell number changes and related genes are mainly responsible for spur length variations of ***,the underlying mechanisms of similar floral traits in morphology may be quite different,enriching our understanding of the mechanisms of flower diversity in angiosperms.

关键词： Aquilegia rockii cell number Columbine Floral polymorphism Intraspecific variation Nectar spur

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Morphology of cylindrical cell sheets with embedded contractile ring

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Applied Mathematics and Mechanics(English Edition) 2019年第12期40卷 1847-1860页

作者： Nan NAN Guohui HU Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai University

The behavior of large deformations of cellular tissues is usually affected by the local properties of cells and their interactions,resulting in folding which acts as an important role in the embryonic development,as well as growing and spreading of a tumor,which can rapidly promote the stereo complexity of the architecture of the *** the present study,a cylindrical vertex model is constructed to explore the morphology of the tubular cell sheets subject to an embedded contractile *** is found that an inner region of the contractile ring in equilibrium will protrude from the tube wall,and it will suddenly collapse when the contractile strength exceeds a threshold,indicating the occurrence of a *** results on the effect of embedded contraction in the tubular shell are quite different from the planar cases,which can reveal the importance of the interaction between the geometric and material non-linearity in cylindrical *** dependence of the large deformation on the bending modulus parameters and contraction strength is also analyzed for the cylindrical cell shell.

关键词： vertex model cylindrical cell sheet contractile ring large deformation protrusion

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Tracking the atomic pathways of Pt3Ni-Ni(OH)2 core-shell structures at the gas-liquid interface by in-situ liquid cell TEM

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Science China Chemistry 2020年第4期63卷 513-518页

作者： Junyu Zhang Gen Li Hong-Gang Liao Shi-Gang Sun State Key Lab of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Using the in-situ liquid cell transmission electron microscopy, the three-stage growth of Pt3Ni-Ni(OH)2 core-shell structures at the gas-liquid interfaces was clearly observed, which consists of(1) a thermodynamically driven Pt3Ni alloy core by the monomer attachment,(2) a nickel(Ni) shell formation due to the depletion of the Pt salt precursor, and(3) the oxidation and of the Ni shell into Ni(OH)2 flakes. We also further observed the nucleation and growth of the Ni(OH)2 flakes on an existing layer either at the middle part or at the step edge. More interestingly, the dynamic transformation among a Pt3Ni alloy, Ni clusters and Ni(OH)2 flakes was also imaged even at a high electron dose rate.

关键词： Pt3Ni-Ni(OH)2 core-shell structure liquid cell electron microscopy gas-liquid interface dynamic transformation

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A strategy for enhancing anaerobic digestion of waste activated sludge: Driving anodic oxidation by adding nitrate into microbial electrolysis cell

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Journal of Environmental Sciences 2019年第7期31卷 34-42页

作者： Hong Peng Zhiqiang Zhao Hong Xiao Yafei Yang Huimin Zhao Yaobin Zhang Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology) Ministry of Education School of Environmental Science and Technology Dalian University of Technology Department of Environmental Science College of Environmental Sciences Sichuan Agricultural University-Chengdu Campus

Cathodic reduction of CO_2 and anodic oxidation of organic matters are crucial to methaneproducing microbial electrolysis cell(MEC) applied in anaerobic digestion of waste activated sludge. However, cathodic CO_2 reduction is usually restrained by slow metabolism rates of H_2-utilizing methanogens and low electron-capturing capacity of CO_2, which consequently slows down the anodic oxidation that participates to sludge disintegration. Herein, a strategy with adding nitrate as electron acceptor to foster electronic transfer between the anode and cathode was proposed to improve anodic oxidation. Results showed that the average efficiency of anodic oxidation in the nitrate-added MEC increased by 55.9%. Accordingly,volatile suspended solid removal efficiency in the nitrate-added MEC was 21.9% higher than that of control MEC. Although the initial cumulative methane production in the nitrateadded MEC was lower than that of control MEC, the cumulative methane production in 24 days was 8.9% higher. Fourier transform infrared spectroscopy analysis indicated that anodic oxidation of MEC with nitrate accelerated the disintegration of sludge flocs and cell walls. Calculation on current signal further revealed that anodic oxidation driven by cathodic nitrate reduction was the main mechanism responsible for the improved sludge digestion.

关键词： Waste activated sludge Microbial electrolysis cell Nitrate Anodic oxidation Sludge reduction

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New design of ferroelectric solar cell combined with luminescent solar concentrator

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Chinese Physics B 2019年第8期28卷 417-424页

作者： Slimane Latreche Mohamed Fathi Abderrahmane Kadri Unité de Développement des Equipements Solaires UDES/Centre de Développement des Energies RenouvelablesCDERTipaza 42415Algeria Laboratoire d'Etude des Matériaux Optoélectronique & Polymères Department of PhysicsUniversity of Oran 1 Ahmed Ben BellaBP 1524 El M'NaouerOran 31000Algeria

A new transparent photovoltaic panel composed of a luminescent solar concentrator and Al/BaTiO3/ZnO/Pt ferroelectric solar cells is presented,in which a portion of the incoming solar illumination is converted by the fluorophores to ultraviolet(UV)light which is then absorbed by ***,the solar cells are simulated using ***,the panel is modelled based on the obtained solar cell *** panel would be of great importance for building integrated photovoltaics domain because of its high transparency.

关键词： Atlas-Silvaco ferroelectric solar cell luminescent solar concentrator building integrated photovoltaic

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AIEgens in cell-based multiplex fluorescence imaging

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Science China Chemistry 2019年第10期62卷 1312-1332页

作者： Yabin Zhou Jin Hua Ben Zhong Tang Youhong Tang Faculty of Biological Engineering Sichuan University of Science and EngineeringYibin 644000China Institute for NanoScale Science and Technology Medical Device Research InstituteCollege of Science and EngineeringFlinders UniversityTonsleySouth Australia 5042Australia Discipline of Medical Biochemistry College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia 5042Australia Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionDivision of Biomedical EngineeringThe Hong Kong University of Science and TechnologyHong KongChina

Fluorescence imaging is an important branch of *** is non-invasive and provides superior spatial and temporal resolution during the real-time monitoring of biological samples of *** the spatial resolution limit of optical microscopes is about 200 nm,due to the diffraction limit,with the application of super-resolution fluorescence microscopy technologies this limit has been pushed below 30 *** makes it feasible to visualize biological structures in subcellular levels and to monitor subcellular biological processes in real ***,due to the complexity of the biological structure and components within cells,simultaneous staining and monitoring multiple intracellular components with different coloured fluorophores is often needed during multiplex imaging,to better understand biological ***-induced emission luminogens(AIEgen)and AIEgen based nanoparticles(NPs)have presented many advantages in fluorescence imaging,with strong potential for biological science and *** this review,we focus on the advantages of AIEgen and AIEgen NP in cell-based fluorescence imaging,and the latest advances of AIEgens in cell-based multiplex imaging are summarized and *** future perspectives are proposed.

关键词： aggregation induced emission cell imaging multiplex

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Performance of different macrophytes in the decontamination of and electricity generation from swine wastewater via an integrated constructed wetland-microbial fuel cell process

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Journal of Environmental Sciences 2020年第3期32卷 252-263页

作者： Feng Liu Lei Sun Jinbao Wan Liang Shen Yanhong Yu Lingling Hu Ying Zhou School of Resources Environmental&Chemical Engineering Nanchang UniversityJiangxi 330031China School of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China Jiangxi Engineering Laboratory of Waterborne Coating School of Chemistry and Chemical EngineeringJiangxi Science and Technology Normal UniversityJiangxi 330013China School of Materials and Mechanical&Electrical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China

Plants constitute a major element of constructed wetlands(CWs).In this study,a coupled system comprising an integrated vertical flow CW(IVCW) and a microbial fuel cell(MFC) for swine wastewater tre atment was developed to research the effects of macrophytes commonly employed in CWs,Canna indica,Acorus calamus,and Ipomoea aquatica,on decontamination and electricity production in the *** of the different root types and amounts of oxygen released by the roots,the rates of chemical oxygen demand(COD) and ammonium nitrogen(NH4^+-N) removal from the swine wastewater differed as *** the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,the COD removal rates were 80.20%,88.07%,84.70%,and 82.20%,respectively,and the NH4+-N removal rates were 49.96%,75.02%,70.25%,and 68.47%,*** decontamination capability of the Canna indica system was better than those of the other *** average output voltages were 520±42,715±20,660±27,and 752±26 mV for the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,respectively,and the maximum power densities were 0.2230,0.4136,0.3614,and0.4964 W/m^3,*** aquatica had the largest effect on bioelectricity generation *** addition,electrochemically active bacteria,Geobacter and Desulfuromonas,were detected in the anodic biofilm by high-throughput sequencing analysis,and Comamonas(Proteobacteria),which is widely found in MFCs,was also detected in the anodic *** results confirmed the important role of plants in IVCW-MFCs.

关键词： Integrated vertical flow constructed wetland Microbial fuel cell Swine wastewater Dissolved oxygen(DO)

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