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Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides

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Chinese Journal of Polymer Science 2022年第7期40卷 781-788页

作者： Wei-Feng Peng Huan-Yu Lei Xin-Xin Zhang Lu-Hao Qiu Ming-Jun Huang South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

The recent development of flexible display technology raised additional requirements for optical and electric properties of polyimides,accelerating the structure and property tunning of transparent *** unique electronic effect and steric hindrance effect of fluorine substitutions make fluorine-containing polyimides occupy an important position in the transparent polyimide *** this work,a series of transparent aromatic polyimides were prepared from a fixed 4,4’-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)and biphenyl diamines with different substitute groups at the 2,2’,6,6’-*** systematically studied the effects of pendant groups on the thermal,mechanical,optical and dielectric properties of these 6FDA-based polyimides with the aid of density function theory(DFT)*** particular,we paid special attention to the simple but compact fluoro group *** simple fluoro substitution brought the advantages of maintaining the linearity of the backbone and dense polymer chain packing,which would minimize the weakening of polyimides’inherent thermal,dimensional and mechanical *** with trifluoromethyl substituted polyimides with the best optical transparency,polyimides containing fluoro substitutes exhibited slightly decreased optical transparency,but increased thermal and dimensional stability and higher mechanical *** results could shed light on the ultimate transparent polyimide film development toward the application in extreme working condition,e.g.,the colorless polyimide substrate film for the flexible display technology.

关键词： Polyimides Fluorine substitution Transparent Dielectric Colorless

Enhance gas-separation efficiency of mixed matrix membranes by lamellarly arranged metal-organic polyhedron

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Nano Research 2023年第8期16卷 11450-11454页

作者： Yida Yang Bowen Pang Wang Zeng Bingxu Ma Panchao Yin Shenglin Yao Xiufang Wen Wei Zhang South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China National Centre for Inorganic Mass Spectrometry in Shanghai Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou 510640China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

Eliminating the nonselective permeation path inside the mixed-matrix membranes(MMMs)is critical for fabrication of gas separation *** demonstrate that by utilizing the phase separation of block copolymers,we are able to introduce metal-organic polyhedrons(MOPs)with precise pore sizes into a polymer matrix and form an ordered layered *** also prove that,by arranging MOP cages into a continuous nanosheet-like layer structure,we are able to generate repeated MOP-effective pathways and deplete the MOP-free permeation pathways,thus enhancing the gas-separation efficiency of MMMs.

关键词： metal-organic polyhedrons(MOPs) mixed-matrix membranes(MMMs) phase separation of mixed-matrix membranes arrangement of MOPs

Decentralized State Estimation of Combined Heat and Power System Considering Communication Packet Loss

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Journal of Modern Power Systems and Clean Energy 2020年第4期8卷 646-656页

作者： Wenjian Zheng Zhigang Li Xinyu Liang Jiehui Zheng Q.H.Wu Fan Hu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Guangzhou Power Supply Guangdong Power Grid Co.Ltd.Guangzhou 510000China

In order to obtain an accurate state estimation of the operation in the combined heat and power system,it is necessary to carry out state *** to the limited information sharing among various energy systems,it is practical to perform state estimation in a decentralized ***,the possible communication packet loss is seldomly considered among various energy *** paper bridges this gap by proposing a relaxed alternating direction method of multiplier *** can also improve the computation efficiency compared with the conventional alternating direction of the multiplier *** studies of two test systems are carried out to show the validity and superiority of the proposed algorithm.

关键词： Alternating direction of multiplier algorithm combined heat and power system communication packet loss decentralized optimization state estimation

Spherical Packing Superlattices in Self-Assembly of Homogenous Soft Matter:Progresses and Potentials

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Chinese Journal of Polymer Science 2023年第5期41卷 607-620,I0005页

作者： Yuchu Liu Huanyu Lei Qing-Yun Guo Xianyou Liu Xinghan Li Yuean Wu Weiyi Li Wei Zhang Geng Xin Liu Xiao-Yun Yan Stephen Z.D.Cheng South China Advanced Institute for Soft Matter Science and Technology School of Molecular Science and EngineeringSouth China University of TechnologyGuangzhou 510640China School of Polymer Science and Polymer Engineering The University of AkronAkron OH 44325-3909USA State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Material Science and EngineeringDonghua UniversityShanghai 201620China

The construction of complex superlattices using homogenous soft matter has great potential for the bottom-up fabrication of complex,nanoscale *** topic is not only interested in scientific exploring for new concepts of supramolecular crystals with nanometer in sizes,which is about thousand times larger in volumes than those of normal crystals,but also practically important to provide construction principles of metamaterials which are artificially structured materials for controlling and manipulating light,sound,and other physical *** systems have fast assembly kinetics and convenient processing procedures,making them ideal for large-scale superlattice *** this perspective,we focus on recent developments in the construction of complex spherical packing superlattices using homogenous soft *** discuss the general mechanism of those formations of supramolecular motifs and provide an overview of the spherical packing superlattices self-assembled by homogenous soft matters based on different volume ***,we outline the potentials of utilizing this approach in constructing novel superlattices as well as its future challenges.

关键词： Soft matter Self-assembly Spherical packing phases Superlattice Bottom-up construction

Broadening and enhancing emission of Cr^(3+) simultaneously by co-doping Yb^(3+) in Ga1.4ln0.6SnO5

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Journal of Rare Earths 2023年第12期41卷 1895-1903,I0003页

作者： Shuang Zhao Zhongfei Mu Lulu Lou Shuwen Yuan Min Liao Qiuming Lin Daoyun Zhu Fugen Wu School of Materials and Energy Guangdong University of TechnologyGuangzhou510006China guangdong Provincial Key Laboratory of Information Photonics Technology guangdong University of Technology Guangzhou510006China Experimental Teaching Department Guangdong University of TechnologyGuangzhou510006China

Cr^(3+)doped broadband near-infrared(NIR) emitting phosphors are currently the focus of *** have developed a variety of strategies to achieve broad and strong NIR emission,However,it is a conundrum to simultaneously broaden and enhance the emission of Cr^(3+)with a single strategy,In this work,we solved this problem by co-doping Yb^(3+).Under 452 nm excitation,Ga_(1.4)In_(0.6)SnO_(5)(GISO):0.01Cr^(3+)shows ultrabroadband NIR emission covering 650-1300 nm with a peak of 884 nm,The full width half maximum(FWHM) of the emission is 215 nm and the internal quantum yield(IQY) is 25%.This indicates that the double sites occupation strategy is favorable to achieve ultra-broadband NIR *** co-doping of Yb^(3+)can effectively broaden and enhance the emission of Cr^(3+).The FWHM for GISO:0.01Cr^(3+),0.002Yb^(3+)extends to 245 nm,and the IQY increases to 28%.Further increasing the concentration of Yb^(3+)to 0.005,the IQY is lifted to 32%.Finally,a phosphor-co nverted light emitting diode(pc-LED) was prepared by integrating the GISO:0.01Cr^(3+),0.002Yb^(3+)with a blue light *** the current drive of 40 mA,the maximum output power of pc-LED is 4.54 mW,and the photoelectric conversion efficiency is 4.12%.These results indicate that Yb^(3+)ions can simultaneously broaden the emission band and improve the emission *** work provides an effective strategy for the design of efficient broadband NIR phosphors in the future.

关键词： Cr^(3+) Ultra-broadband Near-infrared Yb^(3+) Rare earths

Ultra-broadband near infrared phosphor with wide spectral range and long peak wavelength achieved by double-site occupation

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Journal of Rare Earths 2023年第11期41卷 1670-1677,I0001页

作者： Shuwen Yuan Fugen Wu Jin Wang Lulu Lou Shuang Zhao Daoyun Zhu Zhongfei Mu School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of TechnologyGuangzhou 510006China Experimental Teaching Department Guangdong University of TechnologyGuangzhou 510006China

The miniaturization and intelligence of near infrared(NIR)devices urgently require an excellent broadband NIR ***,emission spectra of most NIR phosphors cover less than 1200 nm with a full width at half maximum(FWHM)less than 200 nm and a peak wavelength less than 900 ***,we successfully developed ultra-broadband NIR phosphors ScNbO_(4):Cr^(3+)which can overcome the above shortcomings based on a double-site occupancy *** phosphors achieve ultra-broadband NIR emission from 800 to 1400 nm with a peak wavelength at 980 *** FWHM is up to 217 *** valence state of Cr ions in phosphors was *** double-site occupancy of Cr^(3+)ions in the host and the relationship between host structure and optical properties are discussed in *** light transmission experiments show that phosphors have potential application value in non-destructive *** work develops an excellent NIR luminescent material and provides an efficient method to obtain ultra-broadband NIR phosphors with longer peak wavelength.

关键词： Double-site Ultra-broadband Near infrared Cr^(3+) Rare earths

Construction of piezoelectric BaTiO_(3)/MoS_(2) heterojunction for boosting piezo-activation of peroxymonosulfate

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Chinese Chemical Letters 2021年第6期32卷 2052-2056页

作者： Yanxi Chen Shenyu Lan Mingshan Zhu guangdong Key Laboratory of Environmental Pollution and Health School of EnvironmentJinan UniversityGuangzhou 511443China

The rapid recombination of charge carriers in piezoelectric materials has always been the problem that limits their piezoelectric performance for removal of organic pollutants in ***,we construct a piezoelectric Ba TiO_(3)/MoS_(2)(BTO/MS)that follows a type II heterojunction charge transfer system to inhibit the recombination of electron-hole(e^(-)-h^(+))pairs,which is beneficial to the activation of peroxymonosulfate(PMS)for the removal of antibiotic ornidazole(ORZ)*** optimal ratio of BTO/MS for ORZ degradation under the piezo/PMS process is 13.9,3.6,62.1 and 2.0 times higher than that of the BTO/piezo,MS/piezo,(BTO/MS)/PMS and(BTO/MS)/piezo processes,*** high efficiency charge separation in the piezoelectric heterojunction of BTO/MS promotes the activation of PMS,resulting in the synergy of pizeocatalysis and PMS oxidation during the process of ORZ *** study provides an idea for enhancing piezo-activation of PMS by constructing heterojunctions in piezoelectric materials.

关键词： Piezoelectricity Peroxymonosulfate BaTiO_(3)/MoS_(2)Heterojunction Ornidazole degradation

Competition of Composition Fluctuation Modes in Weakly Segregated Salt-doped Symmetric Diblock Copolymers

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Chinese Journal of Polymer Science 2024年第9期42卷 1375-1385,I0008页

作者： Yuan-Xin Zhou Xian Kong South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

Salt-doped block copolymers have widespread applications in batteries,fuel cells,semiconductors,and various industries,where their properties crucially depend on phase separation ***,investigations into salt-doped diblock copolymers have predominantly focused on microphase separation,overlooking the segregation between ionic and polymeric *** study employs weak segregation theory to explore the interplay between phase separation dominated by the polymer-modulated mode and the salt-out-modulated mode,corresponding to microscopic and macroscopic phase separations,*** comparing diblock copolymers doped with salts to those doped with neutral solvents,we elucidate the significant role of charged species in modulating phase *** phase separation mode exhibits a transition between the polymer-modulated and salt-out-modulated modes at different *** systems doped with neutral solvents,this transition is stepwise,while in salt-ion-doped systems,it is *** a sufficiently large Flory-Huggins parameter between ions and polymers,the salt-out-modulated mode becomes dominant,promoting macrophase *** to the solvation effect of salt ions,salt-doped systems are more inclined to undergo microphase ***,we explore factors influencing the critical wavenumber of phase separation,including doping level and the Flory-Huggins parameters between two blocks and between ions and polymeric *** findings reveal that in a neutral solvent environment,these factors alter only the boundary between micro-and macro-phase separations,leaving the critical wavenumber unchanged in microphase separation ***,in a salt-doped environment,the critical wavenumber of microphase separation varies with these *** provides valuable insights into the pivotal role of electrostatics in the phase separation of salt-doped block copolymers.

关键词： Block copolymer Phase separation Field theory Salt-doped

Expanded graphite confined SnO_(2) as anode for lithium ion batteries with low average working potential and enhanced rate capability

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Journal of Materials Science & Technology 2022年第12期107卷 165-171页

作者： Xianghong Chen Haiying Lu Yu Lei Jiakui Zhang Feng Xiao Rui Wang Peiran Xie Jiantie Xu School of Environment and Energy National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510640China

1. Introduction As the state-of-the-art power resources, lithium ion batteries(LIBs) have dominated the market of smart and portable electronic devices over the past several decades. At present, LIBs have been considered as one of the leading technologies for electric vehicles(EVs) and stationary energy storage systems(ESSs) [1,2]. In order to meet the high demands arising from large-scale applications of EVs and ESSs, the development of LIBs with high energy densities, long cycle life and safe operating environment becomes critically important.

关键词： lithium smart potential