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Photonic amorphous topological insulator

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light(Science & Applications) 2020年第1期9卷 726-733页

作者： Peiheng Zhou Gui-Geng Liu Xin Ren Yihao Yang Haoran Xue Lei Bi Longjiang Deng Yidong Chong Baile Zhang National Engineering Research Center of Electromagnetic Radiation Control materials University of Electronic Science and Technology of China610054 ChengduChina Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

The current understanding of topological insulators and their classical wave analogs,such as photonic topological insulators,is mainly based on topological band ***,standard band theory does not apply to amorphous phases of matter,which are formed by non-crystalline lattices with no long-range positional order but only shortrange order,exhibiting unique phenomena such as the glass-to-liquid ***,we experimentally investigate amorphous variants of a Chern number-based photonic topological *** tuning the disorder strength in the lattice,we demonstrate that photonic topological edge states can persist into the amorphous regime prior to the glass-to-liquid *** the transition to a liquid-like lattice configuration,the signatures of topological edge states *** interplay between topology and short-range order in amorphous lattices paves the way for new classes of non-crystalline topological photonic bandgap materials.

关键词： transition amorphous insulator

Super-resolution dipole orientation mapping via polarization demodulation

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light(Science & Applications) 2016年第1期5卷 112-119页

作者： Karl Zhanghao Long Chen Xu-San Yang Miao-Yan Wang Zhen-Li Jing Hong-Bin Han Michael Q Zhang Dayong Jin Jun-Tao Gao Peng Xi Department of Biomedical Engineering College of EngineeringPeking UniversityBeijing 100871China Department of Automation Tsinghua UniversityBeijing 100084China Bioinformatics Division TNLISTMOE Key Laboratory of Bioinformatics and Center for Synthetic&Systems BiologyTsinghua UniversityBeijing 100084China Department of Radiology Peking University Third HospitalBeijing 100191China Department of Biological Sciences Center for Systems BiologyThe University of TexasDallas 800 West Campbell RoadRL11RichardsonTX 75080-3021USA Department of Basic Medical Sciences School of MedicineTsinghua UniversityBeijing 100084China Institute for Biomedical materials and Devices(IBMD) Faculty of ScienceUniversity of Technology SydneyNSW 2007Australia

Fluorescence polarization microscopy(FPM)aims to detect the dipole orientation of fluorophores and to resolve structural information for labeled organelles via wide-field or confocal *** FPM often suffers from the presence of a large number of molecules within the diffraction-limited volume,with averaged fluorescence polarization collected from a group of dipoles with different ***,we apply sparse deconvolution and least-squares estimation to fluorescence polarization modulation data and demonstrate a super-resolution dipole orientation mapping(SDOM)method that resolves the effective dipole orientation from a much smaller number of fluorescent molecules within a sub-diffraction focal *** further apply this method to resolve structural details in both fixed and live *** the first time,we show that different borders of a dendritic spine neck exhibit a heterogeneous distribution of dipole ***,we illustrate that the dipole is always perpendicular to the direction of actin filaments in mammalian kidney cells and radially distributed in the hourglass structure of the septin protein under specific *** accuracy of the dipole orientation can be further mapped using the orientation uniform factor,which shows the superiority of SDOM compared with its wide-field counterpart as the number of molecules is decreased within the smaller focal *** the inherent feature of the orientation dipole,the SDOM technique,with its fast imaging speed(at sub-second scale),can be applied to a broad range of fluorescently labeled biological systems to simultaneously resolve the valuable dipole orientation information with super-resolution imaging.

关键词： dipole fluorescence polarization microscopy orientation mapping polarization modulation super-resolution

Preparation of Alumina Abrasion-Resistant Ceramic Grinding Ball with Spent FCC Equilibrium Catalyst

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China Petroleum Processing & Petrochemical technology 2010年第4期12卷 23-29页

作者： Liang Zhiyu Yan Guiyang Zheng Liuping Weng Xiulan Huang Zheqiang College of Chemistry and materials Science Fujian Normal University Fuzhou 350007 Meizhouwan Environmental Monitoring Station Putian 351158

The chemical composition, structure and thermal stability of the spent FCC equilibrium catalyst from an oil refinery were characterized by XRD, FT-IR, DTA-TG, BET, complete chemical analysis, SEM, and XRF. The spent FCC equilibrium catalyst, clay, barium carbonate, and talc were used as the main raw materials to prepare the alumina abrasion-resistant ceramic balls to be used in the powder grinding mill for manufacture of architecture tiles. The results showed that after proper formulation study, the spent FCC equilibrium catalyst could replace industrial alumina to prepare high performance grinding balls. Meanwhile, the various performance indices of the grinding ball could meet the quality standard for similar products, and additionally, the energy saving effect was achieved in the operation of the grinding section, resulting in a successful comprehensive utilization of solid wastes.

关键词： spent FCC equilibrium catalyst alumina abrasion-resistant ceramic ball solid waste utilization

Long Lasting Phosphorescence and Photo-Stimulated Long Lasting Phosphorescence in Tb^(3+)-doped Strontium Borosilicate Glasses

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Journal of Wuhan University of technology(materials Science) 2007年第B12期22卷 879-882页

作者：赵建军李成宇 key laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of Sciences

Long lasting phosphorescence （LLP） and photo-stimulated long lasting phosphorescence （PSLLP） were observed in Tb^3＋-doped strontium borosilicate glasses. The green phosphorescence arises fromf-f transitions of Tb^3＋ and can be observed with naked eyes in the dark for up to 10 hours after the irradiation with a uv lamp （λmax =254 nm） for 30 min at room temperature. The glass could re-emit LLP under the stimulation of a uv lamp （λmax=366 rim） for 60 seconds after the LLP disappeared. The re-emitted LLP is called PSLLP. The glass sample was characterized by the fluorescence and thermoluminescence spectra, respectively. The possible mechanism of the LLP and PSLLP was also discussed.

关键词： long lasting phosphorescence glasses Tb^3+

High-Performance Room-light-Driven β-AgVO3/mpg-C3N4 Core/Shell Photocatalyst Prepared by Mechanochemical Method

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Advances in Chemical Engineering and Science 2021年第4期11卷 290-315页

作者： Hendrik Kosslick Yingyong Wang M. Farooq Ibad Xiangyun Guo Matthias Lütgens Stefan Lochbrunner Marcus Frank Nguyen Quang Liem Axel Schulz Institute of Chemistry University of Rostock Rostock Germany Leibniz-Institute for Catalysis at the University of Rostock Rostock Germany Institute of Coal Chemistry State Key Laboratory of Coal Conversion Chinese Academy of Sciences Beijing China Institute of Physics University of Rostock Rostock Germany Electron Microscopic Center (EMZ) Institute of Pathology University of Rostock Rostock Germany Institute of materials Science Vietnam Academy of Science and Technology Ha Noi Viet Nam

A new highly efficient, visible light active, silver vanadate/polymeric carbonitride “core/shell” photocatalyst was prepared mechano-chemically prepared by grinding mixtures of β-silver vanadate and mesoporous graphitic carbonitride. Besides the core/shell photocatalyst, β-silver vanadate/mesoporous polymeric carbonitride composites and supported mpg-C3N4@β-silver vanadates were prepared. The materials were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), nitrogen ad- and de-sorption, diffuse reflectance UV-Vis measurement (DRS), infrared spectroscopy, Raman microscopy, and time-resolved photoluminescence spectroscopy. The photocatalytic performance of the materials was investigated in the degradation of organics using pharmaceutical ibuprofen and 4-(isobutyl phenyl) propionic acid sodium salt as model compounds under batch conditions. Reaction intermediates were studied by electrospray ionization and time-of-flight mass spectrometry (ESI-TOF-MS). Additionally, the degree of mineralization was determined by total organic carbon TOC measurements. The core/shell photocatalyst has shown superior photocatalytic activity compared to the other prepared composites or supported photocatalysts as well as the single mpg-C3N4. Scavenger experiments showed that valence band holes and anionic superoxide radicals are the main active species in the photocatalytic process. TOC measurement confirmed the mineralization of the organic compound, which was in line with ESI-TOF-MS experime

关键词： Carbonitrides Photocatalysis Visible light Water Treatment Mineralization Core-Shell Catalyst Silver Vanadate

Understanding the Temperature Dependence of the Seebeck Coefﬁcient from First-Principles Band Structure Calculations for Organic Thermoelectric materials

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CCS Chemistry 2021年第10期3卷 1477-1483页

作者： Ran Liu Yufei Ge Dong Wang Zhigang Shuai moe key laboratory of Organic OptoElectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084

The Seebeck effect measures the electric potential built up in materials under a temperature *** organic thermoelectric materials,the Seebeck coefficient shows more complicated temperature dependence than conventional systems,with both monotonic increases and nonmonotonic behavior,that is,first increasing and then *** mechanism behind the phenomenon is *** first-principles calculations coupled with the Boltzmann transport equation,we demonstrate typical trends of the Seebeck coefficient with respect to temperature through band structure analysis.

关键词： org anic thermoelectric materials See-beck coefficient band structure calculation ambi-polar t he rmoe lectric trans port Boltzmann tr ansport equation

The leaf extract of Mallotus japonicus and its major active constituent, rutin,suppressed on melanin production in murine B16F1 melanoma

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Asian Pacific Journal of Tropical Biomedicine 2015年第10期5卷 819-823页

作者： Junsei Taira Eito Tsuchida Masatsugu Uehara Natsuko Ohhama Wakana Ohmine Takayuki Ogi Department of Bioresource technology Okinawa National College of Technology Okinawa Industrial technology Center

Objective: To find anti-melanogenesis materials used in whitening ***: The ethanolic leaf extract of Mallotus japonicus(M. japonicus) having an anti-melanogenesis activity was separated by a sephadex LH-20 chromatography. Each fraction was measured for its tyrosinase inhibitory activity together with its polyphenol content using the Folin–Ciocalteu method. The anti-melanogenesis activity of the active fractions was determined by the melanin content in the murine B16F1 melanoma. The active fractions were put together due to similar constituents, and then separated by high performance liquid chromatography using a C-18 ODS column. The major antimelanogenesis compound was identified using1 H and13C-NMR and liquid chromatography-mass ***: The ethanolic leaf extract of M. japonicus showed an anti-tyrosinase activity with a high polyphenol content, resulting in suppression of melanin production in the B16F1 melanoma. The extract was separated and the active compound was identical as rutin based on the1 H,13C-NMR and liquid chromatography-mass spectrometry analysis data. In addition, the rutin treatment with cells reduced the melanin content in a concentration dependent manner without any cell toxicity. The leaf extract of M. japonicus containing rutin would be useful in whitening cosmetics for protection from uv-light exposure to be limiting the accumulation of melanin in ***: The leaf extract of M. japonicus and/or rutin isolated from the extract as a key whitening agent would be useful as a whitening cosmetic material for protecting against disorder skin due to melanin accumulation.

关键词： melanin rutin melanoma cosmetics constituent suppr

Microwave Hydrothermal Synthesis of ZnO/CQDs with Good Visible-light Photocatalytic Properties of NOx Removal

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Microwave Hydrothermal Synthesis of ZnO/CQDs with Good Visib...

Microcavity exciton polaritons at room temperature

第十八届中国科协年会——分12 大气雾霾及PM2.5控制先进技术研讨会

作者： Yan LIU Yu HUANG Junji CAO key laboratory of Aerosol Chemistry and Physics Institute of Earth Environment Chinese Academy of Sciences

Recently, ash haze pollution became the main problem of atmospheric environment in China. As one of the important precursors1] of secondary organic aerosols(SOA) of heavy haze pollution, NOx is typically characterized for low concentration(ppb) and difficult to remove, therefore research on air purifying technology of high efficiency is very important. Compared with traditional methods(such as physical adsorption and biological filtration), semiconductor photocatalytic technology has the advantages of high efficiency, low cost and energy consumption, which is widely used in air pollution control. As one of the traditional photocatalytic materials, although Zn O(3.37 e V) has many advantages, there are still some shortcomings such as narrow spectral response range and low quantum efficiency. Carbon quantum dots(CQDs) 2] are novel carbon nanomaterials with features including low toxicity, biological compatibility, upconversion emission and photoinduced electronic transmission 3], which can convert long wavelength to short wavelength and effectively separate the electron-hole to improve quantum efficiency. In this study, Zn O/CQDs visible-light photocatalysts were synthesized by microwave hydrothermal method and were applied in NOx removal, moreover their physical/chemical properties and visible-light photocatalytic mechanism were analyzed(Fig.1a). The results showed that:(1) Zn O/CQDs were hollow microspheres with the size of 540 nm-680 nm(Fig.1b);(2) compared with Zn O, uv-DRS absorption of Zn O/CQDs obviously enhanced in visible-light range(Fig.1c);(3) the removal rate of NO by Zn O/CQDs visible-light photocatalysis was as high as 32%, and there was almost no NO intermediates generated in the photocatalytic process(Fig.1d). Finally, the continuous cycle test indicated that Zn O/CQDs still can exhibit good photocatalytic properties after 6 cycles. In conclusion, Zn O/CQDs synthesized by microwave hydrothermal method possessed high visible-light photocatalytic activit

关键词： Zn O/CQDs visible-light photocatalysis NOx removal

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Photonics Insights 2022年第1期1卷 60-103页

作者： Sanjib Ghosh Rui Su Jiaxin Zhao Antonio Fieramosca Jinqi Wu Tengfei Li Qing Zhang Feng Li Zhanghai Chen Timothy Liew Daniele Sanvitto Qihua Xiong Beijing Academy of Quantum Information Sciences BeijingChina Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore School of materials Science and Engineering Peking UniversityBeijingChina Research Center for Wide Gap Semiconductor Peking UniversityBeijingChina key laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi key laboratory of Information Photonic Technique School of Electronic Science and EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’anChina Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamenChina CNR NANOTEC Campus EcotekneLecceItaly State key laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijingChina Frontier Science Center for Quantum Information BeijingChina Beijing Innovation Center for Future Chips Tsinghua UniversityBeijingChina

The quest for realizing novel fundamental physical effects and practical applications in ambient conditions has led to tremendous interest in microcavity exciton polaritons working in the strong coupling regime at room *** the past few decades,a wide range of novel semiconductor systems supporting robust exciton polaritons have emerged,which has led to the realization of various fascinating phenomena and practical *** paper aims to review recent theoretical and experimental developments of exciton polaritons operating at room temperature,and includes a comprehensive theoretical background,descriptions of intriguing phenomena observed in various physical systems,as well as accounts of optoelectronic ***,an in-depth review of physical systems achieving room temperature exciton polaritons will be presented,including the early development of ZnO and GaN microcavities and other emerging systems such as organics,halide perovskite semiconductors,carbon nanotubes,and transition metal ***,a perspective of outlooking future developments will be elaborated.

关键词： microcavity exciton polariton Bose-Einstein condensation exciton binding energy quantum simulation nonequilibrium dynamics