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TiO_2-based building materials:Above and beyond traditional applications

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Chinese Science Bulletin 2009年第7期54卷 1137-1142页

作者： GUO sen wu ZhongBiao ZHAO WeiRong Department of Environmental Engineering Zhejiang University Hangzhou 310027 China

In the 1910s, TiO2 began to be used in building materials as pigments and opacifier due to its excellent optical property. Since the photocatalytic property of TiO2 was observed in 1972, its application field was expanded to air cleaning and sterilization. Thereafter, people added TiO2 into building materials to develop novel and facile building materials. These materials were widely used for air cleaning, sterilization, self-cleaning, anti-fogging, decoration, and building cooling. The combination of building and other functions can serve simultaneously. Although TiO2-based building materials have bright prospects, some aspects such as improving the stability and enhancing photoactive performance of the materials are of importance for future research.

关键词：建筑材料 TiO2 应用传统二氧化钛光学性能空气净化光催化性能

Flash memory based on MoTe_(2)/boron nitride/graphene semifloating gate heterostructure with non-volatile and dynamically tunable polarity

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Nano Research 2022年第7期15卷 6507-6514页

作者： Shijie Wang Guangyu Geng Yang Sun sen wu Xiaodong Hu Enxiu wu Jing Liu School of Precision Instruments and Opto-electronics Engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Precision Measurement Technology and Instruments Tianjin 300072China

Atomically thin two-dimensional(2D)materials are promising candidates to develop flash memories with premium performances as compared to conventional bulk materials,because of their ultra-thin thickness and highly tunable electrical *** far,most of the reported 2D material based flash memories work in the uni-polar mode,which usually further integrate additional local gate to achieve bi-polar ***,such approach is volatile,meaning that the gate bias has to be applied persistently to maintain the polarity change and thus increases the power ***,we report a bi-polar memory based on MoTe_(2)/h-BN/graphene semi-floating gate(SFG)heterostructure,which has non-volatile and dynamically tunable *** SFG configuration has the channel layer of MoTe_(2) and dielectric layer of h-BN half-stacked on the floating gate layer of *** off-graphene half of the MoTe_(2) channel can be tuned between n-type and p-type by simultaneously applying ultraviolet(UV)illumination and electrical field through the back gate,which maintains this polarity after the removal of both *** a result,the SFG memory can work in the non-volatile bi-polar mode,with a on/off ratio of~100 and switching speed of 1 *** the other hand,the on-graphene half of the MoTe_(2) channel remains n-type under UV illumination and electrical bias,so that the MoTe_(2) full floating gate memory maintains n-type,which implements the integration of both n-and p-type memories in a single 2D *** capability provides great flexibility for memory devices adapting in various emerging applications.

关键词： polarity modulation ultraviolet light semi-floating gate nonvolatile

Electrical characterization of an individual nanowire using flexible nanoprobes fabricated by atomic force microscopy-based manipulation

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Nanotechnology and Precision Engineering 2023年第4期6卷 55-65页

作者： Yilin Wang Enxiu wu Jirui Liu Mengke Jia Rui Zhang sen wu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

Nanowires have emerged as promising one-dimensional materials with which to construct various nanocircuits and ***,measuring the electrical properties of individual nanowires directly remains challenging because of their small size,thereby hindering the comprehensive understanding of nanowire-based device performance.A crucial factor in achieving reliable electrical characterization is establishing well-determined contact conditions between the nanowire sample and the electrodes,which becomes particularly difficult for soft *** here is a novel technique for measuring the conductivity of an individual nanowire with the aid of automated nanomanipulation using an atomic force *** this method,two nanowire segments cut from the same silver nanowire are positioned onto a pair of gold electrodes,serving as flexible nanoprobes to establish controllable contact with the *** changing the contact points along the nanowire sample,conductivity measurements can be performed on different regions,thereby eliminating the influence of contact resistance by analyzing multiple current–voltage *** this approach,the resistivity of a 100-nm-diameter silver nanowire is determined to be 3.49×10^(−8)Ωm.

关键词： Electrical characterization Nanowire Flexible nanoprobe Nanomanipulation AFM

Advances in pig models of human diseases

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Animal Models and Experimental Medicine 2022年第2期5卷 141-152页

作者： Naipeng Hou Xuguang Du sen wu College of Animal Science and Technology China Agricultural UniversityBeijingChina Sanya Institute of China Agricultural University SanyaChina State Key Laboratory of Agrobiotechnology College of Biological SciencesChina Agricultural UniversityBeijingChina

Animal models of human diseases play a critical role in medical *** are anatomically and physiologically more like humans than are small rodents such as mice,making pigs an attractive option for modeling human *** in recent years in genetic engineering have facilitated the rapid rise of pig models for use in studies of human *** the present review,we summarize the current status of pig models for human cardiovascular,metabolic,neurodegenerative,and various genetic *** also discuss areas that need to be *** models of human diseases play a critical role in medical *** in recent years in genetic engineering have facilitated the rapid rise of pig models for use in studies of human *** the present review,we summarize the current status of pig models for human cardiovascular,metabolic,neurodegenerative,various genetic diseases and xenotransplantation.

关键词： animal model gene-editing human disease pig

An episomal CRISPR/Cas9 system to derive vector-free gene modified mammalian cells

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Protein & Cell 2016年第9期7卷 689-691页

作者： Li, Linlin Gao, Fei wu, sen China Agr Univ Coll Biol Sci State Key Lab Agrobiotechnol Beijing 100193 Peoples R China

Dear Editor,CRISPR and CRISPR-associated （Cas） proteins play their adaptive immunity role in degrading foreign nucleic acids in both bacteria and archaea. CRISPP,/Cas has proved efficient in modifying mammalian genomes （Cong et al., 2013; Mali et al., 2013） and various delivery methods for Cas9： gRNA complex have been established. Among different delivery means, in vitro transcribed Cas9 mRNNgRNA,

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Paraxial propagation of cosh-Airy vortex beams in chiral medium

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Chinese Physics B 2020年第3期29卷 181-189页

作者： Xiao-Jin Yang Zhen-sen wu Tan Qu School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China School of Electronic Engineering Xidian UniversityXi’an 710071China

Propagation dynamics of the cosh-Airy vortex(CAiV) beams in a chiral medium is investigated analytically with Huygens–Fresnel diffraction integral formula. The results show that the CAiV beams are split into the left circularly polarized vortex(LCPV) beams and the right circularly polarized vortex(RCPV) beams with different propagation trajectories in the chiral medium. We mainly investigate the effect of the cosh parameter on the propagation process of the CAiV *** propagation characteristics, including intensity distribution, propagation trajectory, peak intensity, main lobe's intensity, Poynting vector, and angular momentum are discussed in detail. We find that the cosh parameter affects the intensity distribution of the CAiV beams but not its propagation trajectory. As the cosh parameter increases, the distribution areas of the LCPV and RCPV beams become wider, and the side lobe's intensity and peak intensity become larger. Besides, the main lobe's intensity of the LCPV and RCPV beams increase with the increase of the cosh parameter at a farther propagation distance, which is confirmed by the variation trend of the Poynting vector. It is significant that we can vary the cosh parameter to control the intensity distribution, main lobe's intensity, and peak intensity of the CAiV beams without changing the propagation trajectory. Our results may provide some support for applications of the CAiV beams in optical micromanipulation.

关键词： cosh-Airy vortex beams chiral medium cosh parameter

Self-Adaptive Grinding for Blind Tip Reconstruction of AFM Diamond Probe

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Nanotechnology and Precision Engineering 2018年第2期1卷 150-155页

作者： Linyan Xu Qishan Guo Shuangbei Qian sen wu State Key Laboratory of Precision Measuring Technology and Instruments(Tianjin University) Tianjin 300072China

Blind tip reconstruction(BTR) method is one of the favorable methods to estimate the atomic force microscopy(AFM) probe shape. The exact shape of the characterizer is not required for BTR, while the geometry of the sample may affect the reconstruction significantly. A cone-shaped array sample was chosen as a characterizer to be evaluated. The target AFM probe to be reconstructed was a diamond triangular pyramid probe with two feature angles, namely front angle(FA) and back angle(BA). Four conical structures with different semi-angles were dilated by the pyramid probe. Simulation of scanning process demonstrates that it is easy to judge from the images of the isolated rotary structure, cone-shaped, the suitability of the sample to be a tip characterizer for a pyramid probe. The cone-shaped array sample was repeatedly scanned 50 times by the diamond probe using an AFM. The series of scanning images shrank gradually and more information of the probe was exhibited in the images, indicating that the characterizer has been more suitable for BTR. The feature angle FA of the characterizer increasingly reduces during the scanning process. A self-adaptive grinding between the probe and the characterizer contributes to BTR of the diamond pyramid probe.

关键词： AFM diamond probe BTR Cone characterizer Self-adaptive Grinding

Osmopriming-Regulated Changes of Plasma Membrane Composition and Function were Inhibited by Phenylarsine Oxide in Soybean Seeds

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Journal of Integrative Plant Biology 2009年第9期51卷 858-867页

作者： Jiajin Zhuo Weixiang Wang Yun Lu wu sen Xiaofeng Wang Key Laboratory for Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education Beijing Forestry University Beijing 100083 China School of Bioengineering Xihua University Chengdu 610039 China

The aim of the present work was to investigate the effects of osmoconditioning on chilling injury in chilling-sensitive soybean （Glycine max （L.） Merr. Zhonghuang No. 22） seeds during imbibition. Low temperatures reduced the germination rate and no seed germinated at 1 ℃. Osmoconditioning of seeds at 20℃ with a polyethylene glycol-8000 （PEG8000） solution at 1.5 MPa for 72 h followed by drying back to their initial moisture content （MC） reduced their chilling sensitivity. The phenylarsine oxide （PAO）, an inhibitor of protein tyrosinephosphatases, was used to investigate the possible involvement of phosphorylation-dephosphorylation of Tyr residues in the plasma membrane composition and function when seeds were osmoconditioned. The results showed the germination of osmoconditioned seeds decreased significantly when PAO was added in PEG solution after chilling treatment. PAO inhibited changes in composition of plasma membrane phospholipids and fatty acid induced by osmocondition, indicated that tyrosine protein phosphorylation is involved in the regulatory mechanisms of osmocondition-responsive chilling in soybean seeds. Western blot result further indicated that osmocondition treatment improved the activity of plasma membrane H^＋-ATPase after chilling treatment, but this effect was abolished by PAO. The possible regulation mechanism by Tyr protein phosphorylation is discussed.

关键词： fatty acid membrane lipid osmoconditioning phenylarsine oxide protein-tyr phosphatases soybean seeds.

Hydrogen-Bonded Supramolecular Network Triggers High-Efficiency Blue Room-Temperature Phosphorescence

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CCS Chemistry 2024年第11期6卷 2727-2740页

作者： sen wu Tao Wang Eli Zysman-Colman Organic Semiconductor Centre EaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsFife KY169ST School of Materials Science&Engineering Beijing Institute of TechnologyBeijing 100081

Hydrogen bonding has been employed to suppressnonradiative decay in organic compounds that showroom-temperature phosphorescence (RTP);however, the small number of structurally diverse examplesmakes it unclear how general this strategy is to turnon RTP. In this study, we report highly efficient blueRTP from 4,4′,4′′-nitrilotribenzoic acid (TPA-CO_(2)H)in five structurally and chemically distinct hydrogenbonded supramolecular networks. In doped films inpoly(vinyl alcohol) (PVA), the phosphorescencequantum yield and lifetime (ΦPh and τPh) reach 52%and 275 ms. Boric acid can also be used to turn onRTP, and the performance changes significantlywhen the sample is heated beyond the dehydrationtemperature of this host where there is a 14-foldenhancement in the ΦPh after heat treatment. BlueRTP similar to that observed in PVA was also observed using granulated sugar, gelatine, and paper ashost matrices. This work elucidates for the first timethe role and the generality of hydrogen bonding inactivating efficient blue RTP and examines how thechoice of hydrogen bonding host influences RTPperformance. We further demonstrate how the emission color can be tuned by codoping the films withRhodamine 6G.

关键词： room-temperature phosphorescence blue phosphorescence 4,4′,4′′-nitrilotribenzoic acid hydrogen bonding supramolecular networks