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Double-Layer Hydrogels with Tunable Mechanofluorochromic Response for Smart Display

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Chinese Journal of Polymer Science 2023年第4期41卷 547-555,I0007页

作者： Hui-Hui Shi Shuang-Shuang Wu Rui-Jia Wang Yi Zhang Shu-Hui An Wei Lu Tao Chen Key Laboratory of Marine materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China School of Chemical sciences University of Chinese Academy of SciencesBeijing100049China

Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive ***,traditional mechanofluorochromism relies on the chemical transformations of mechanophores,but their types are quite *** remains challenging to develop mechanofluorochromic materials with customized fluorescence color changing ***,a generally applicable strategy is proposed to present a class of double-layer mechanofluorochromic hydrogels based on the facile integration of two different-colored fluorescent *** to the UV transmittance change of top layer under Poisson’s effect,the emission intensity ratio of the upper and lower hydrogels exhibits a strain-dependent change,resulting in a force-triggered overlapping color *** the UV transmittance of top layer and the fluorescence emission of bottom layer can be readily modulated to enrich the variety of ***,the bottom layer is available to be printed by ion inks to fabricate patterned double-layer fluorescent hydrogel,holding great potential to design flexible mechanofluorochromic platforms for smart display and information encryption.

关键词： Mechanofluorochromism Fluorescent hydrogel Double layer Smart display

Photoluminescence of ZnS Clusters in Zeolite-Y

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Journal of materials Science & Technology 1997年第5期13卷 397-404页

作者： Chen, W Wang, ZG Lin, ZJ Xu, Y Lin, LY Lab. of Semiconductor materials sciences Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

Two obvious emissions are observed from the ZnS clusters encapsulated in zeolite-Y. The emission around 355 nm is sharp and weak, locating at the onset of the absorption edge. The band around 535 nm is broad, strong and Stokes-shifted. Both the two emissions shift to blue and their intensities firstly increase then decrease as the loading of ZnS in zeolite-Y or clusters size decreases. Through investigation, the former is attributed to the excitonic fluorescence, and the latter to the trapped luminescence from surface states. The cluster size-dependence of the luminescence may be explained qualitatively by considering both the carrier recombination and the nonradiative recombination rates. Four peaks appearing in the excitation spectra are assigned to the transitions of 1S-1S, 1S-1P, 1S-1D and surface state, respectively. The excitation spectra of the clusters do not coincide with their absorption spectra. The states splitted by quantum-size confinement are detected in the excitation spectra, but could not be differentiated in the optical absorption spectra due to inhomogeneous broadening. The size-dependence of the excitation spectra is similar to that of the absorption spectra. Both the excitation spectra of excitonic and of trapped emissions are similar, but change in relative intensity and shift in position are observed.

关键词： Zeolites

Microstructure and mechanical properties of Mg-Zn-Y-Nd-Zr alloys

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Journal of Rare Earths 2013年第6期31卷 616-621页

作者：王晶刘瑞东董旭光杨院生 Institute of Metal Research Chinese Academy of Sciences New materials Research Institute of Shandong Academy of sciences

The microstructure and tensile properties of the as-cast and solution treatment Mg-4.5Zn-1Y-xNd-0.5Zr （x=0, 1 wt.%, 2 wt.%, 3 wt.%） alloys were investigated. The results showed that the microstructure of Mg-4.5Zn-1Y-0.5Zr alloy consisted of α-Mg, Zn-Zr, W （Mg3Y2Zn3） and I （Mg3YZn6） phases. With the addition of Nd, I-phase disappeared and Mg3Y2Zn3 phase changed into Mg3（Nd,Y）2Zn3 phase. When the content of Nd reached 3 wt.%, T phase, i.e., ternary Mg-Zn-Nd phase, formed. In addition, with the increase of Nd content in the alloys, the secondary dendritic arm spacing decreased, while the amount of intermetallic phases increased. For as-cast Mg-4.5Zn-1Y-xNd-0.5Zr alloys, after solution treatment, microsegregation was eliminated and the shape of eutectic structure of α-Mg＋W transformed from lamellar into spherical. The tensile strength and elongation of Mg-4.5Zn-1Y- 3Nd-0.5Zr alloy were increased from 219.2 MPa and 11.0% to 247.5 MPa and 20.0%, respectively.

关键词： Mg-Zn-Y-Nd-Zr alloys homogenizing treatment microstructure mechanical properties rare earths

Progress in bulk MgCu_2-type rare-earth iron magnetostrictive compounds

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Chinese Physics B 2013年第7期22卷 11-27页

作者：任卫军张志东 Shenyang National Laboratory for materials Science and International Centre for materials Physics Institute of Metal ResearchChinese Academy of Sciences

Studies of bulk MgCu2-type rare-earth iron compounds with Laves phase are reviewed. The relationship between magnetostriction and structural distortion and the consequent crystallographic method for measuring magnetostriction are introduced at first. Then we review recent progress in understanding bulk magnetostrictive Laves phase materials, especially the magnetostriction and the minimization of the anisotropy of the light rare-earth Pr- and Sm-based compounds. Finally, a summary and outlook for this kind of compounds are presented.

关键词： magnetostriction anisotropy Laves compound

Electric modulation of anisotropic magnetoresistance in Pt/HfO_(2-x)/NiO_(y)/Ni heterojunctions

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Chinese Physics B 2023年第8期32卷 98-103页

作者：叶晓羽朱小健杨华礼段吉鹏孙翠李润伟 CAS Key Laboratory of Magnetic materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Zhejiang Province Key Laboratory of Magnetic materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

Electric field control of magnetism through nanoionics has attracted tremendous attention owing to its high efficiency and low power *** solid-state dielectrics,an electric field drives the redistribution of ions to create onedimensional magnetic conductive nanostructures,enabling the realization of intriguing magnetoresistance(MR)***,we explored the electric-controlled nickel and oxygen ion migration in Pt/HfO_(2-x)/NiO_(y)/Ni heterojunctions for MR *** adjusting the voltage polarity and amplitude,the magnetic conductive filaments with mixed nickel and oxygen vacancy are *** results in the reduction of device resistance by~10^(3)folds,and leads to an intriguing partial asymmetric MR *** show that the difference of the device resistance under positive and negative saturation magnetic fields exhibits good linear dependence on the magnetic field angle,which can be used for magnetic field direction *** study suggests the potential of electrically controlled ion migration in creating novel magnetic nanostructures for sensor applications.

关键词： nanoionics resistance random access memory anisotropic magnetoresistance angle detection

Growth and Characterization of InSb Thin Films on GaAs(001) without Any Buffer Layers by MBE

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Chinese Physics Letters 2017年第7期34卷 177-181页

作者：赵晓蒙张杨崔利杰关敏王保强朱战平曾一平 Key Laboratory of Semiconductor materials Science Institute of SemiconductorsChinese Academy of Sciences College of materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

We report the growth of InSb layers directly on GaAs （001） substrates without any buffer layers by molecular beam epitaxy （MBE）. Influences of growth temperature and V/Ⅲ flux ratios on the crystal quality, the surface morphology and the electrical properties of InSb thin films are investigated. The InSb samples with room- temperature mobility of 44600cm2/Vs are grown under optimized growth conditions. The effect of defects in InSb epitaxial on the electrical properties is researched, and we infer that the formation of In vacancy （VIn） and Sb anti-site （SbIn） defects is the main reason for concentrations changing with growth temperature and Sb2/In flux ratios. The mobility of the InSb sample as a function of temperature ranging from 90 K to 360K is demonstrated and the dislocation scattering mechanism and phonon scattering mechanism are discussed.

关键词： Growth and Characterization of InSb Thin Films on GaAs MBE

Effect of CO on Characteristics of AlGaN/GaN Schottky Diode

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Chinese Physics Letters 2008年第8期25卷 3025-3027页

作者：冯春王晓亮杨翠柏肖红领张明兰姜丽娟唐建胡国新王军喜王占国 materials Science Center Institute of SemiconductorsChinese Academy of SciencesKey Laboratory of Semiconductor Materials ScienceInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083

Pt Schottky diode gas sensors for CO are fabricated using A1GaN/GaN high electron mobility transistor（HEMTs）structure. The diodes show a remarkable sensor signal （3 mA, in N2, 2mA in air ambient） biased 2 V after 1% CO is introduced at 50℃. The Schottky barrier heights decrease for 36meV and 27meV in the two cases respectively. The devices exhibit a slow recovery characteristic in air ambient but almost none in the background of pure N2, which reveals that oxygen molecules could accelerate the desorption of CO and offer restrictions to CO detection.

关键词： HEMTS

Synthesis and Characterization of Two New Photochromic Inorganic-organic Hybrid materials Based on Keggin-type Polyoxometalates

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Journal of Wuhan University of Technology(materials Science) 2008年第3期23卷 367-371页

作者：库宗军 College of Chemistry and materials sciences Xiaogan University

Two new photochromic inorganic-organic hybrid materials formed from Keggin-type polyoxometalates（POMs） and metronidazole （C6H9N3O3, MNZ）, formulated as H3PMo12OaO-3MNZ·3H2O （1） and H3PW12O40.3MNZ·3H2O（2）, were synthesized and characterized by elemental analysis, IR spectra, electronic spectra, electron spin resonance （ESR） spectra and thermogravi-metry-differential thermal analysis （TG-DTA）. Reflectance spectra show the presence of weak intermolecular charge transfer between the organic and inorganic moieties in the solid state. The photochromic properties were studied by solid diffuse reflectance spectra and ESR spectra, and the photochromic reactions were found to exhibit first-order kinetics. TG-DTA showed that two hybrid materials have similar thermal behavior.

关键词： polyoxometalate metronidazole hybrid material photochromism kinetics

Enhanced Cryogenic Magnetocaloric Effect Induced by Small Size GdNi_5 Nanoparticles

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Journal of materials Science & Technology 2014年第10期30卷 973-978页

作者： Jun Li Song Ma Han Wang Wenjie Gong Jingjing Jiang Shaojie Li Yong Wang Dianyu Geng Zhidong Zhang Shenyang National Laboratory for materials Science Institute of Metal Researchand International Centre for Materials PhysicsChinese Academy of Sciences

GdNi5 nanoparticles and GdNis/Gd2O3 nanocapsules （with GdNi5 core and Gd2O3 shell） were prepared by arcdischarge technique under different hydrogen partial pressure. The GdNi5 nanoparticles show irregular spherical shape and have a size distribution of 10-50 nm with an average diameter of 15 nm. In comparison, the GdNi5/Gd2O3 nanocapsules present spherical morphology and show a size distribution of 10-100 nm with an average diameter of 60 nm. Under a magnetic field change of 50 kOe, the maximum magnetic entropy change of GdNi5 nanoparticles is 13.5 J/（kg K） at 5 K, while the corresponding value of the GdNis/Gd2O3 nanocapsuels is only 5.7 J/（kg K） at 31 K. The origin of the large magnetic entropy change of GdNi5 nanoparticles is ascribed to its high atomic moments and small anisotropy energy barrier induced by its small particle size.

关键词： Nanoparticle Superparamagnetic property Cryogenic refrigeration Magnetocaloric effect Nanocapsule