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Hierarchical BiF₃-Bi₂NbO₅F core-shell structure and Its Application in the Photosensitized Degradation of Rhodamine B under Visible Light Irradiation

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JOURNAL OF PHYSICAL CHEMISTRY C 2015年第1期119卷 502-511页

作者： Lei, Shuijin Wang, Chuanning Cheng, Di Gao, Xijie Chen, Lianfu Yan, Yutao Zhou, Jianliang Xiao, Yanhe Cheng, Baochang Nanchang Univ Sch Mat Sci & Engn Nanchang 330031 Jiangxi Peoples R China Nanchang Univ Dept Cardiothorac Surg Affiliated Hosp 2 Nanchang 330006 Jiangxi Peoples R China

Catalytic photodegradation has been found to be a versatile, low-cost, and green technology for environmental decontamination. Bismuth-based compounds have attracted a lot of attention for their efficient photocatalytic properties. It is always of great importance to develop new catalysts in the photodegradation field. In this research, hierarchical porous BiF3Bi2NbO5F coreshell structures have been successfully prepared via a simple solvothermal route. A possible growth mechanism for the coreshell structure was proposed based on time-dependent-evolution experiments. X-ray powder diffraction was used to determine the phase composition. Scanning electron microscopy and transmission electron microscopy were employed to characterize the morphologies of the as-prepared samples. Experiments demonstrated that the volume ratio of ethylene glycol to water played a determinative role in the final morphology of the products. The band gap of the as-prepared BiF3Bi2NbO5F composite was estimated to about 3.47 eV. The novel hierarchical BiF3Bi2NbO5F coreshell structures could serve as a catalyst for photosensitized degradation of Rhodamine B under visible light irradiation. Moreover, the photodegradation efficiency of the samples was greatly associated with their surface morphology.

关键词： Phototoxic Dermatitis shell structures Visible Light rhodamine B Light irradiation Catalysts Green technology Irradiation Hierarchical shell-core structure Phase composition photolysis

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Preparation of nanofiber polythiophene layered on Ba _x Sr_1-x Fe₁₂O₁₉/Fe₃O₄/polyacrylic acid core-shell structure and its microwave absorption investigation

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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 2015年第3期120卷 1165-1171页

作者： Hosseini, Seyed Hossein Moloudi, Maryam Islamic Azad Univ Fac Sci Dept Chem Islamshahr Branch Tehran Iran Islamic Azad Univ Fac Tech & Engn Dept Chem Saveh Branch Saveh Iran

Ba (x) Sr1-x Fe12O19/Fe3O4/polyacrylic acid/polythiophene (Ba (x) Sr1-x Fe12O19/Fe3O4/PAA/PTh) nanocomposites with multi-core-shell structure were successfully synthesized by four steps. The samples were characterized by FTIR, X-ray diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer, and radar absorbing material reflectivity far-field radar cross-section method, respectively. XRD and TEM results indicated that the obtained nanoparticles have multi-core-shell morphology. The magnetic properties and microwave absorption analyses reveal that there are interphase interactions at the interface of Ba (x) Sr1-x Fe12O19, Fe3O4, PAA, and PTh, which can affect the magnetic properties and microwave absorption properties of the samples. The microwave-absorbing properties of nanocomposites were investigated at 8-14 GHz. A typical layer absorber exhibited an excellent microwave absorption with a -26 dB maximum absorption at 14 GHz. Compared with core material, the coercivity and saturation magnetization of multi-core-shell nanocomposites decrease obviously, but the microwave absorption properties of nanocomposites are improved greatly. The results show that these composite could be used as advancing absorption and shielding materials due to their favorable microwave-absorbing properties.

关键词： shell structures barium Nanocomposites core material Transmission electron microscopy preparation Saturation magnetization shell-core structure microwave absorption

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Solubility enhancement and epitaxial core-shell structure of Si-doped ZnO via a specific pulsed laser ablation route

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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 2015年第3期120卷 1033-1045页

作者： Huang, Chang-Ning Chen, Shuei-Yuan Zheng, Yuyuan Shen, Pouyan Southern Taiwan Univ Sci & Technol Dept Chem & Mat Engn Tainan Taiwan I Shou Univ Dept Mech Engn Kaohsiung Taiwan Natl Sun Yat Sen Univ Dept Mat & Optoelect Sci Kaohsiung 80424 Taiwan

Wurtzite (W)-type ZnO nanocondensates and particulates with enhanced solid solubility of Si4+ and special defect nanostructures were synthesized via pulsed laser ablation of Zn2SiO4/ZnO composite target under a relatively high peak power density of 1.4 x 10(12) W/cm(2) in high vacuum (3.5 x 10(-5) torr). The nanocondensates were either dispersed in an amorphous Zn-O-Si phase as a composite sphere up to submicrons in size or coalesced by the {}, {}, and {} facets as unity and twin. The particulates tended to have an epitaxial 1D commensurate 2x (0002) superstructure (i.e., 1 x 1 x 2 superstructure in 3D) at the edge with enhanced Si4+ doping and the amorphous phase coverage. Such W-ZnO nanocondensates and particulates have modified Raman bands and photoluminescence due to internal compressive stress and overdoped Si4+ in substitutional and/or interstitial sites coupled with charge/volume compensating defects for potential optoelectronic and optocatalytic applications.

关键词： shell structures photoluminescence Pulsed lasers flat surfaces Superstructures shell-core structure silicon phase compressive stresses zinc oxides

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The core-shell structure of PNIPAM collapsed chain conformation induces a bimodal transition on cooling

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SOFT MATTER 2013年第15期9卷 3985-3993页

作者： Lai, Hengjie Chen, Qianjin Wu, Peiyi Fudan Univ State Key Lab Mol Engn Polymer Dept Macromol Sci Shanghai 200433 Peoples R China Fudan Univ Adv Mat Lab Shanghai 200433 Peoples R China Chinese Univ Hong Kong Dept Chem Shatin Hong Kong Peoples R China

The core-shell structure of a poly(N-isopropylacrylamide) (PNIPAM) collapsed chain conformation is an intermediate conformation formed in the heating process, which was found not only in single-chain solution but also in dilute aqueous solution. However, the relationship between the intermediate structures and thermodynamic properties is still not clear. Herein, the behavior of the bimodal transition, in which two exothermic peaks appear in the DSC cooling curves, has been investigated through different effects of polymer molecular weight, polymer concentration and thermal history. The results show that the higher-temperature peak (T-2) is attributed to the hydration of the loose shell while the lower-temperature peak (T-1) is ascribed to the further hydration of the compact core. However, the bimodal transition in cooling is observed clearly only when the PNIPAM concentration is less than its overlap concentration (C*). Moreover, it is found that the ratio of the T-2 peak can be enhanced either with higher heating rate or less isothermal time at high temperature, since more structures of the loose periphery could be preserved in these cases. For measurements in the cooling-heating cycle, in addition, the result also reveals that the assembled behavior of the core-shell structure is reversible.

关键词： Molecular Conformation shell structures exothermic peak shell-core structure Bimodal poly-N-isopropylacrylamide Hydration PROCESS HEAT

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Enhanced photoluminescence properties of methylene blue dye encapsulated in nanosized hydroxyapatite/silica particles with core-shell structure

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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 2013年第3期113卷 583-589页

作者： Ge, Xiaolu Li, Chengfeng Fan, Chengyu Feng, Xiaoxing Cao, Bingqiang Chinese Acad Sci Anhui Inst Opt & Fine Mech Key Lab Atmospher Composit & Opt Radiat Hefei 230031 Peoples R China Shandong Univ Technol Sch Sci Zibo 255049 Peoples R China Shandong Univ Technol Sch Mat Sci & Engn Zibo 255049 Peoples R China Univ Jinan Sch Mat Sci & Engn Jinan 250022 Peoples R China

Organic dye of methylene blue (MB) was encapsulated in core-shell structured hydroxyapatite/silica particles (HAp/silica-MB) through a modified Stober method with the addition of polyvinylpyrrolidone molecules. It was found that MB molecules were released from HAp/silica-MB at a slower rate than those from silica-MB in deionized water. In phosphate buffered saline (pH: 7.2-7.4) and acidic solutions (pH: 1.5-1.6), the penetration of ions in the interface influenced the interaction between HAp and MB molecules, which resulted in the rapid release of MB molecules from HAp/silica-MB. From the UV-Vis absorbance spectra, one could see that MB molecules in HAp/silica-MB were weakly aggregated in comparison with those in silica-MB. For HAp/silica-MB, enhanced luminescence properties were observed in the photoluminescence spectra and dual luminescence with two emission peaks were caused by the presence of monomers and dimers. Contrarily, no photoluminescence emission was detected for samples of free MB and silica-MB under the same excitation condition because of the self-quenching effect. It was the adsorption of MB molecules on HAp that had resulted in the enlargement of intramolecular distance and the reduction of self-quenching effect. These hybrid particles with enhanced luminescent properties might find wide applications in the field of bioanalysis, bioseparation, and biomedical imaging.

关键词： Enhanced photoluminescence properties photoluminescence molecules Encapsulated Mass Biomedical imaging Organic dye Methylene Blue shell-core structure MACHINE BASIN

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Preparation of porous sustainable adsorbent and its adsorption behavior for Pb2+

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ENVIRONMENTAL RESEARCH 2025年 274卷 121289页

作者： Guo, Yuhang Chen, Xiao Feng, Xiaoping Zhao, Mingyang Pan, Yating Zhang, Kai Li, Jinhui Wuhan Univ Technol State Key Lab Silicate Mat Architecture Wuhan 430070 Peoples R China Wuhan Univ Technol Sch Mat Sci & Engn Wuhan 430070 Peoples R China Wuhan Text Univ Coll Mat Sci & Engn Wuhan 430200 Peoples R China

Using granulated blast furnace slag as raw material, chitosan and NaCl as modifier, chitosan modified granulated blast furnace slag based porous geopolymer (PCG) was prepared under the activation conditions of NaOH and sodium silicate. It was used to wrap different types of lightweight aggregates to obtain PCG-lightweight aggregate shell-core structure (PCG-L). PCG-L was used for the adsorption of Pb2+. Firstly, the influencing factors on the adsorption performance of the main component materials (PCG, lightweight aggregates) of PCG-L were studied. Then, the static adsorption properties and sustainable adsorption properties of Pb2+ by different shell-core structures were investigated. The relationship between the water absorption characteristics of the paste and the aggregate and the adsorption characteristics of PCG-L towards Pb2+ was established. The adsorption kinetics, adsorption isotherms and adsorption thermodynamics were analyzed. Finally, the adsorption mechanism of PCG-L was discussed by Zeta analyzer, FT-IR, EDS, XPS and MIP. The results indicate that as chitosan (0-2 wt%) and NaCl (0-60 wt%) increase, the saturated adsorption capacity of PCG for Pb2+ rises (98.57-159.93 mg/g). The Pb2+ adsorption capacity of lightweight aggregate (0.34-1.21 g/dm3) increases with its water absorption (0.2-15.0%). Under the premise that the water absorption rate of aggregate is greater than that of PCG, the higher the water absorption rate of the two, the stronger the adsorption capacity of the matching PCG-L, the maximum adsorption capacity of A2N30-H is 5.12 g/dm3 and it can still maintain a high removal rate after 40 cycles of adsorption. PCG-L adsorption via ion exchange, electrostatic attraction, surface complexation, and pore fixation.

关键词： Porous geopolymers Chitosan Lightweight aggregate shell-core structure Adsorbent Water treatment

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Development of poly(lactic acid)/polyvinyl alcohol-based temperature-responsive shell-core nanofibers: Controlled release, biosafety evaluation, and application in raspberry preservation

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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES 2025年第Pt 2期307卷 142084页

作者： Xia, Shuqiong Bian, Mengjie Li, Hengyi Shi, Chong Xu, Mengyang Lyu, Lianfei Wu, Yaqiong Cao, Fuliang Wang, Yicheng Li, Weilin Fang, Donglu Nanjing Forestry Univ Coll Light Ind & Food Engn Nanjing 210037 Jiangsu Peoples R China Jiangsu Prov & Chinese Acad Sci Inst Bot Jiangsu Key Lab Res & Utilizat Plant Resources Nanjing Bot Garden Mem Sun Yat Sen Nanjing 210014 Jiangsu Peoples R China Nanjing Forestry Univ Coll Forestry & Grassland Coinnovat Ctr Sustainable Forestry Southern China State Key Lab Tree Genet & Breeding Nanjing 210037 Jiangsu Peoples R China

With the increasing demand for sustainable and effective food preservation methods, the development of novel smart preservation materials has become a pressing need. A temperature-responsive smart nanofiber material with a shell-core structure, polyvinyl alcohol/poly(N-isopropylacrylamide)/polylactic acid/lemon essential oil (PPPL), was developed by incorporating lemon essential oil as a core-layer preservative and poly(N-iso- propylacrylamide) as a temperature-responsive shell layer. Transmission electron microscopy confirmed the shell-core structure of the fibers. When the temperature exceeded the lower critical solution temperature, the water contact angle increased from 56 degrees to 91 degrees, confirming that PPPL was temperature-responsive. Infrared spectroscopy revealed interactions between the core and shell layers, which contributed to the tensile strength of 4.31 MPa and enhanced the material's water vapor barrier properties. Release studies indicated that the fibers effectively regulated lemon essential oil release, achieving a radical scavenging rate of 42 % within 24 h. Analysis of the release kinetics revealed temperature-dependent control and effective inhibition of Staphylococcus aureus and Escherichia coli growth. Additionally, the PPPL fibers exhibited significant natural degradation after three months of incubation and showed no toxicity to zebrafish or BV2 mouse glial cells, confirming their environmental and biological safety. A raspberry preservation experiment further demonstrated that under fluctuating temperature conditions, the nanofiber membrane slowed postharvest deterioration in fruit quality. This coaxial nanofiber material enables the sustained release of antibacterial agents triggered by temperature variations, offers long-term preservation for food storage, and supports the use of electrospinning technology in smart food packaging.

关键词： Nanofiber membrane Temperature-responsive shell-core structure Antimicrobial activity Electrospinning Controlled release

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X9R BaTiO₃-Based Dielectric Ceramics with Multilayer core-shell structure Produced by Polymer-Network Gel Coating Method

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JOURNAL OF THE AMERICAN CERAMIC SOCIETY 2015年第3期98卷 690-693页

作者： Wang, Ting Hao, Hua Liu, Mengying Zhou, Dongdong Yao, Zhonghua Cao, Minghe Liu, Hanxing Wuhan Univ Technol Sch Mat Sci & Engn State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

The modified polymer-network gel route has been developed to prepare a multilayer core-shell structure of BaTiO3-based dielectric ceramics. The core of particle was BaTiO3, whereas 0.7BaTiO(3)-0.3Bi(Zn1/2Ti1/2)O-3 (0.7BT-0.3BZT) and Nb oxides were coated as the multilayer shell compositions, which were confirmed by energy dispersive spectroscopy testing. The dielectric properties of BaTiO3-based samples with multilayer core-shell structure were found to meet the X9R specification. The dielectric constant was 1190 and the dielectric loss was 1.3% at room temperature.

关键词： dielectric properties Gels COATING METHODS shell structures multilayers Energy Dispersive X-Ray Spectroscopy shell-core structure dielectric ceramics Dielectric losses

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Converse magnetoelectric effect in CoFe₂O₄-BaTiO₃ composites with a core-shell structure

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SMART MATERIALS AND structureS 2011年第7期20卷 075006-1-075006-6页

作者： Shvartsman, V. V. Alawneh, F. Borisov, P. Kozodaev, D. Lupascu, D. C. Univ Duisburg Essen Inst Mat Sci D-45141 Essen Germany Hashemite Univ Dept Conservat Sci Zarqa 13115 Jordan Univ Duisburg Essen Fac Phys D-47048 Duisburg Germany Univ Liverpool Dept Chem Liverpool L69 7ZD Merseyside England NT MDT Europe BV NL-5656 AG Eindhoven Netherlands

Multiferroic composites were prepared by covering CoFe2O4 nanoparticles with a shell of BaTiO3 using a sol-gel technique. Scanning probe microscopy confirmed the formation of a core-shell structure with a magnetic core and a piezoelectric shell. The converse magnetoelectric effect was studied at different temperatures and bias fields. The magnetoelectric coefficient peaks at approximately 270 K and reaches the value alpha(C) approximate to (2.2 +/- 0.1) 10(-11) s m(-1), which surpasses those reported previously for similar structures. A change of the sign of the magnetoelectric coefficient observed for an increasing magnetic bias field is related to the non-monotonic field dependence of magnetostriction in polycrystalline CoFe2O4.

关键词： Magnetic cores Field Dependence Composites shell structures Magnetoelectric effects shell-core structure Converse magnetoelectric Magnetostriction

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Preparation of MnO₂/porous carbon material with core-shell structure and its application in supercapacitor

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2018年第10期29卷 7957-7964页

作者： Xie, Yiming Wang, Lingjie Guo, Qiyao Yin, Jie Liu, Jia Fan, Leqing Wu, Jihuai Huaqiao Univ Inst Mat Phys Chem Engn Res Ctr Environm Friendly Funct Mat Minist Educ Xiamen 361021 Peoples R China

Tubular manganese dioxide (MnO2) is synthesized by hydrothermal method, and a silicon dioxide (SiO2) used as template is wrapped on the as-synthesized MnO2. Then poly(styrene-co-divinylbenzene) (PS) as heteropolymeric carbon precursor was wrapped on as-prepared MnO2/SiO2 to form intermediate product MnO2@SiO2@PS. The intermediate products were treated by carbon tetrachloride, stripped template and carbonized, thus the final product MnO2/porous carbon composite (MnO2@PC) with core-shell structure was obtained. The core-shell structural composite is used as an electrode of supercapacitors, which combines high conductivity and high surface specific area of porous carbon material and high electrochemical activity of MnO2. The resulting core-shell MnO2@PC exhibits a maximum specific capacitance of 196.2 F g(-1) at a discharge density of 1 A g(-1) with capacitance retention of 78.52% over 5000 discharge/charge cycles.

关键词： shell structures water calorimetry Supercapacitors shell-core structure high conductivity carbonaceous materials jigs(templates) carbon tetrachloride intermediate product specific capacitance

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