JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Pengfei Wang,Xiong Huang,Jianwei Zhao,Saiwei Luan,Xinyu Fu,Bo Li,Jun Yang,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
It has generally been believed that the performance of ultra-thin multilayer ceramic capacitors (MLCCs) are mainly controlled by doping elements and the contribution of synthesis approaches of BaTiO 3 (BT) powders can be neglected. However, in this study, we demonstrate that the solid-state powders exhibit a heterogeneous distribution of residual BaCO 3 (BC), TiO 2 , or Ti-rich phases, whereas hydrothermal powders are characterized by a BC surface layer, which can be characterized by nanoinfrared (AFM-IR), and the divergent approaches play an important role in the “core–shell” structure. The BC layer in hydrothermal BT contributes to Ti vacancies during sintering, increasing the “core–shell” ratio in MLCCs. This results in augmented capacitance but reduced performance at elevated temperatures. Conversely, the presence of a Ti-rich phase in solid-state powders induces Ba vacancies, leading to decreased “core–shell” ratios and dielectric constants.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Qi Gu,Changfa Zhu,Ruobing Cheng,Junlong Zhou,Jintao He,Tanlong Liu,Yuxin Yang,Yuan Lian,Kuihua Zhang
A novel core–shell with a tetradecyl dimethyl benzyl ammonium chloride–modified montmorillonite (TDMBA/MMT) interlayer silk fibroin (SF)/poly(lactic acid) (PLLA) nanofibrous membrane was fabricated using a simple conventional electrospinning method . Scanning electron microscopy and pore size analyses revealed that this core–shell with TDMBA/MMT interlayer maintained its nanofibrous morphology and larger pore structure more successfully than SF/PLLA nanofibrous membranes after treatment with 75% ethanol vapor. Transmission electron microscopy and energy-dispersive X-ray spectroscopy analyses testified that the SF/PLLA–TDMBA/MMT nanofibers exhibited a core–shell with an interlayer structure, with SF/PLLA in the core–shell layer and TDMBA/MMT in the interlayer. The formation of a core–shell with interlayer nanofibers was primarily attributed to the uniform dispersion of TDMBA/MMT nanosheets in a solution owing to its exfoliation using hexafluoroisopropanol and then preparing a stable spinning solution similar to an emulsion. Compared to SF/PLLA nanofibrous membranes, the core–shell structure with TDMBA/MMT interlayers of SF/PLLA nanofibrous membranes exhibited enhanced hydrophilicity , thermal stability, mechanical properties as well as improved and long-lasting antimicrobial performance against Escherichia coli and Staphylococcus aureus without cytotoxicity.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
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IF 4.179
Xiaolei Zhu,Hongwei Zhang,Jun Nie,Guiping Ma
pH-sensitive drug loaded core shell fibers were fabricated by a combination of electrospinning and UV photo-polymerization. Combretastatin A4 (CA4) was selected as the model drug loaded in PLA to test the pH-sensitivity property of the core shell fibers. The morphology of the fibers was studied by scanning electron microscopy (SEM), and the core shell structure of the fibers was confirmed by transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The drug release assay was tested via the UV–vis spectrophotometer, and the pH-sensitivity of core shell fibers was tested by drug release assay under pH 5.0 and 7.4.
研究领域:
材料科学
·
药学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yuling Chen,Wei Huang,Kuijun Chen,Ting Zhang,Yang Wang,Jianmin Wang
Herein, a novel core-shell structure composite with traditional conducting polymer, polypyrrole (PPy) as its core and zeolitic imidazolate framework-8 (ZIF-8) shell structure was successfully prepared. Thanks to the advantages over electrocatalytic surface provided by ZIF-8 shell and a charge collector given by PPy, the obtained core/shell-structured PPy@ZIF-8 composite displayed an excellent electrocatalytic performance towards quercetin (QR) determination. Under the optimized experimental condition, the differential pulse voltammetry (DPV) peak current signals depend linearly on QR concentration in the range of 0.01–7.0 μmol ⋅ L −1 and 7.0–150 μmol ⋅ L −1 with a low detection limit of 7 nmol ⋅ L −1 . Furthermore, the proposed electrochemical sensor also exhibited good sensitivity, excellent selectivity with reasonable reproducibility and stability during the detection of quantitative QR. A satisfactory performance was observed when this novel sensor was applied to detect QR in human plasma samples with recoveries of 99.1–102.6% and R.S.D. (n = 3) < 3.2%. Thus, the current study provides a new and efficient electrocatalyst for designing QR electrochemical sensor based on conductive conjugated polymer/MOFs heterostructure.
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jinze Lyu,Junwei Shao,Yanhong Wang,Yiqun Qiu,Ji Li,Tong Li,Yujin Peng,Feiyang Liu
The photocatalytic mineralization efficiency of antibiotics is primarily determined by the adsorption ability and photoactivity of the photocatalyst. In this work, we constructed a porous core-shell homojunction by growing amorphous TiO 2 onto mesoporous rutile TiO 2 crystals (MRCs) to simultaneously enhance the adsorption ability and photoactivity of the catalyst. Tetracycline hydrochloride (TCH) was chosen as a model agent of antibiotics. Scanning electron microscopy, high resolution transmission electron microscopy, N 2 adsorption-desorption, and X-ray diffraction experiments were conducted to investigate the physical properties of the prepared samples. Surface photovoltage spectroscopy and X-ray photoelectron spectroscopy were applied to study the charge separation process. The results showed that amorphous TiO 2 was homogeneously coated on the MRCs surface, thereby forming a 3D hierarchical porous core-shell morphology. The growth of amorphous TiO 2 increased the surface area of the catalyst by 213% and the amount of TCH absorbed by up to 1760%. Moreover, a homojunction was formed at the interface of the MRC core and the amorphous TiO 2 shell. The built-in electric field of the homojunction drove photogenerated holes (electrons) migrating from the core to the shell (shell to core) and thus enhanced the charge separation. TCH and the holes simultaneously concentrated in the amorphous TiO 2 shell, thereby enhancing the mineralization of TCH.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 38
·期 1
·448-454
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IF 2.966
Lai-Jun Zhang,Xing-Can Shen,Hong Liang,Fa-Yun Chen,Hai-Jin Huang
ZnSe:Mn and core–shell ZnSe:Mn/ZnS doped quantum dots (d-dots) have been synthesized by using the alkylamine–H2Se complex and thiourea as new phosphine-free Se and S precursors, respectively. Absorption spectroscopy, steady-state (solution and solid-state) and time-resolved photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy were used to characterize the resulting d-dots. Results showed that Mn2+ was successfully doped and mainly distributed in the middle layer of the actual ZnSe/ZnSe:Mn/ZnSe d-dots and ZnSe/ZnSeS:Mn/ZnS d-dots which were simply referred to as ZnSe:Mn and core–shell ZnSe:Mn/ZnS d-dots with ZnSe and ZnS outmost shells, respectively. The increase in the intensity of phosphorescence from the dopant Mn2+ was obtained by the corresponding injection of Zn precursor or Zn/S precursors for ZnSe or ZnS shell growth. As compared to the ZnSe shell, the ZnS shell was grown more significantly on the surface of the ZnSe:Mn core, which led to larger d-dots due to a thicker ZnS shell and thus deeper doping of Mn2+ in the larger host. Outstanding improvement has been achieved in both phosphorescence intensity and stability after growth of the ZnS shell relative to the ZnSe shell. The corresponding phosphorescence efficiency of the resulting d-dot cyclohexane solution was enhanced from about 8% for the ZnSe:Mn d-dots to 35% for the ZnSe:Mn/ZnS d-dots.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Fei Li,Wei Cui,Zhaobo Tian,Jie Zhang,Songmo Du,Zhanglin Chen,Shijia Zhang,Kexin Chen,Guanghua Liu
High-purity SiC/graphene powders with the core-shell structure were controllably prepared by combustion synthesis from Mg/SiC powders in 0.5 MPa CO 2 atmosphere. The maximum reaction temperatures were much higher than 1000 ℃, greatly promoting the vapor reaction between Mg and CO 2 . The thickness of synthesized graphene can be well regulated in the range of 1–10 layers by changing the Mg/SiC mass ratio in the raw materials. The graphene layers were complete and uniformly coated on the surface of SiC particles. The interface between SiC and graphene was clear and well bonded without any interface separation or amorphous layer. Further, core-shell SiC/graphene powders synthesized in this work have great potential for application in the field of electromagnetic shielding, photocatalysis , etc.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 37
·6698-6708
·
IF 5.52
Jianbo Tan,Mingguang Yu,Xin Rao,Jianwen Yang,Zhaohua Zeng
Highly monodisperse PMMA microspheres covered with a thermo-responsive shell were synthesized in a single step by means of photoinitiated RAFT dispersion polymerization at room temperature. Thermo-responsive macro-RAFT agents (P(mPEGA-co-MEA)-TTCs) with different lower critical solution temperatures (LCST) were used as stabilizers in the process. Particle yields of over 95% were achieved within 45 min of UV irradiation, showing a fast process. The microspheres obtained were well-dispersed in water at a temperature below the LCST, and precipitated from the aqueous dispersion at a temperature above the LCST, exhibiting reversible thermo-responsive properties. The particle size can be precisely controlled by adding a monomer to the reaction in batches, and the microspheres maintained their high uniformities during the reaction. The thermo-responsive PMMA microspheres can be effectively conjugated to proteins via the carboxyl groups on the macro-RAFT chains. A thermo-responsive PMMA/ZIF-8 core–shell structure was also synthesized by using P(mPEGA-co-MEA)-b-PAA stabilized PMMA microspheres as the template, and exhibited good adsorption properties for methylene blue.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2022
·Vol. 28
·期 71
·e202202410
·
IF 5.02
Yong Gao,Dani Zhang,Jingjing Li,Hao Gong,Cheng Jiang,Hairong Xue,Xianli Huang,Tao Wang,Jianping He
Graphical The P doped MoS 2 @Ni 3 S 2 nanorods array with core/shell structure was prepared through successive sulfuration and phosphorization strategies, which exhibits close catalytic activity to Pt/C, the overpotential is only 290 mV at 250 mA cm −2 . Electrocatalysis is the most promising strategy to generate clean energy H 2 , and the development of catalysts with excellent hydrogen evolution reaction (HER) performance at high current density that can resist strong alkaline and acidic electrolyte environment is of great significance for practical industrial application. Therefore, a P doped MoS 2 @Ni 3 S 2 nanorods array (named P-NiMoS) was successfully synthesized through successive sulfuration and phosphorization. P-NiMoS presents a core/shell structure with a heterojunction between MoS 2 (shell) and Ni 3 S 2 (core). Furthermore, the doping of P modulates the electronic structure of the P-NiMoS; the electrons transfer from the t 2g orbital of Ni element to the e g empty orbital of Mo element through the Ni−S−Mo bond at the Ni 3 S 2 and MoS 2 heterojunction, facilitating the hydrogen evolution reaction. As a result, P-NiMoS exhibits excellent HER activity; the overpotential is 290 mV at high current density of 250 mA cm −2 in alkaline electrolyte, which is close to Pt/C (282 mV@250 mA cm −2 ), and P-NiMoS can stably evolve hydrogen for 48 h.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Chengyuan Hua,Shaozhu Yin,Zhiyuan Zhang,Jiaoyang Liu,Xinru Chen,Baoyun Ye,Jingyu Wang,Chongwei An
Enhancing specific impulse and optimizing combustion performance are key objectives in the development of composite solid propellants (CSPs). In this study, a novel core–shell structured AP-based composite fuel (AP@Al) was designed and synthesized via interface engineering strategies, leveraging fuel-oxidizer integration and synergistic core–shell interactions to improve combustion efficiency. The morphology, structure and thermal properties of AP@Al were studied.Furthermore, combustion tests were conducted to evaluate its impact on propellant combustion behavior, and the condensed combustion products (CCPs) were analyzed to elucidate its combustion mechanisms. The results indicate that the unique core–shell structure of AP@Al significantly accelerates the thermal decomposition of AP.Compared to conventional CSPs, propellants containing AP@Al exhibit a combustion rate increase of up to 21.8% and a reduction in ignition delay time of up to 30%, demonstrating its superior ignition and combustion characteristics. Moreover, the aggregation of combustion residues is markedly reduced, providing new insights into its potential mechanism for improving combustion efficiency. These findings highlight the promising application prospects of AP@Al as an advanced composite fuel for next-generation solid propellants.
研究领域:
材料科学
·
燃烧学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kui Wang,Taotao Lu,Mingyang Che,Qi Guo,Xiaolei Liu,Xueping Wu,Xianlong Zhang
A novel strategy for the synthesis of core–shell carbon nanospheres (CNS) with tunable architectures is presented, utilizing hydrothermal carbonization (HTC) of glucose. By modulating feed-injection dynamics, reaction time, and concentrations of key intermediates—formic acid (FA) and levulinic acid (LA)—precise control over CNS morphology and structural properties was achieved. FA was found to enhance shell formation by accelerating dehydration and surface polymerization reactions, while LA facilitated core growth via aldol condensation and structure-directing crosslinking agent during early nucleation stages. The interplay of these intermediates enabled fine-tuning of the core-to-shell ratio, with advanced characterization ( 13 C MAS NMR, FTIR, XPS, XRD, and Raman) confirming the transition from hydroxymethylfurfural-driven nucleation to aromatic-rich structures. This study provides a comprehensive understanding of HTC mechanisms and establishes a versatile platform for designing hierarchical carbon materials for diverse applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Renjie Ji,Defu Yin,Yao Chen,Like Ma,Fanglin Lv,Yuhao Zhang,Zhen Jia,Jingyun Zhang,Mingya Liu,Shitao Yu,Yue Liu
A core–shell catalyst mZSM-5@SO 4 2- /mSiO 2 composed of mZSM-5 core and SO 4 2- /mSiO 2 shell was prepared by the soft template method. Core-shell structure could promote the building of Brønsted -Lewis (B-L) acids interface and significantly improve the synergistic effect of B-L. In this paper, the Brønsted/Lewis (B/L) of mZSM-5@SO 4 2- /mSiO 2 was targeted regulating by innovatively introducing Brønsted acid (BA) sites into the shell. The optimal mZSM-5@SO 4 2- /mSiO 2 catalyst (B/L = 0.142) could achieve 72.1 % furfural yield at 140 ℃ for 1 h. In addition, 70.2 % furfural yield could be obtained after the catalyst was recycled and regenerated for 5 times. Combining In-situ IR and 13 C NMR, the reaction path was revealed in detail: xylose was first isomerized to xylulose and then dehydrated to furfural. This paper provides a research idea for the directional regulation of dual active sites of cascade reaction catalysts.
研究领域:
催化化学
·
生物质转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）