APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Rui Cai,Ping-an Yang,Haibo Ruan,Xin Huang,Zhihao Zhou,Qiao Chen,Yuxin Zhang,Xinglong Gong,Yingang Gui,Rui Li
How to prepare materials according to the target properties has been a hot research topic. In this paper, the target electromagnetic parameters are obtained according to the performance requirements, and the nanoflower rod-like, low-density mulberry-like and high-density mulberry-like one-dimensional (1D) core–shell structured Fe@Ni ( x ) nanowires (NWs) are prepared by liquid-phase reduction method. The effective absorption bandwidth (EAB) of sample Fe@Ni (40) in the low-frequency (2–8 GHz) is up to 1.89 GHz (3.1 mm). Sample Fe@Ni (60) is able to reach a maximum EAB of 3.18 GHz at a thickness of 0.9 mm. Concisely, the sample has the ability to absorb microwaves in low frequency bands and ultra-thin thicknesses. The reason can be attributed to the strong magnetic coupling brought by the bimetallic composition to strengthen the resonance level and the excellent 1D core–shell structure to enhance the efficiency of polarization loss. In conclusion, Fe@Ni ( x ) provides a technological route for the preparation of low-frequency and ultra-thin-thickness absorbers.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035966
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IF 2.6
Chunxin Wang,Jun Xie,Qi Liu,Yaxuan Liu,Qing Xie
According to the problems of poor insulation and local temperature rise of polypropylene film, a new nano-filler was studied, and the mechanism of improving insulation and thermal conductivity was analyzed. TiO2 with high dielectric constant is combined with Al2O3 with excellent thermal conductivity in the form of a core–shell structure. TiO2 increases the dielectric constant of polypropylene films, and shell Al2O3 introduces high thermal conductivity and assumes the role of dielectric buffer layer. Compared with pure PP, the breakdown voltage of PP/TiO2 is increased by 6.05%, the thermal diffusivty coefficient is increased by 110.67%, the breakdown voltage of PP/TiO2@Al2O3 is increased by 37.05%, and the thermal diffusivity coefficient is increased by 266.85%. Experimental and simulation results show that TiO2 introduces low-density traps, TiO2@Al2O3 introduces high-density deep traps, and Al2O3 modifies the surface defects of high-dielectric nanoparticles and increases the equivalent interface region. Based on the analysis of the experimental results with different mass fractions, this paper proposes the optimal filling ratio of the new core–shell, which provides a new method for the composite dielectric to improve the insulation and thermal conductivity at the same time.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
Journal of Materials Chemistry B
·
2024
·Vol. 12
·期 9
·2384-2393
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IF 6.1
Kexin Feng,Jinlan Tang,Ruiyang Qiu,Bin Wang,Jianglin Wang,Weikang Hu
Oxidative stress is one of the obstacles preventing wound regeneration, especially for chronic wounds. Herein, designing a wound dressing with an anti-oxidant function holds great appeal for enhancing wound regeneration. In this study, a biocompatible and degradable nanofiber with a core–shell structure was fabricated via coaxial electrospinning, in which polycaprolactone (PCL) was applied as the core structure, while the shell was composed of a mixture of silk fibroin (SF) and tocopherol acetate (TA). The electrospun PST nanofibers were proven to have a network structure with significantly enhanced mechanical properties. The PSTs exhibited a diameter distribution with an average of 321 ± 134 nm, and the water contact angle of their surface is 124 ± 2°. The PSTs also exhibited good tissue compatibility, which can promote the adhesion and proliferation of L929 cells. Besides, the dissolution of silk fibroin encourages the release of TA, which could play a synergistic effect and regulate the oxidative stress effect in the damaged area, for it promotes the adhesion and proliferation of skin fibroblasts (L929), reduces the cytotoxicity of hydrogen peroxide to cells, and lowers the level of reactive oxygen species. The animal experiment indicated that the PSTs would promote the reconstruction of skin. These nanofibers are expected to repair skin ulcers related to diabetes.
研究领域:
生物材料学
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医学工程
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组织工程
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DOI
PubMed
高影响因子
MATERIALS LETTERS
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2015
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IF 2.489
Yuan Gao,Ding Zhao,Ming-Wei Chang,Zeeshan Ahmad,Xiang Li,Hairui Suo,Jing-Song Li
The electrospraying process has been exploited in recent times to prepare micro- and nano-scaled polymer based particulate structures for a range of biomedical and pharmaceutical applications. Conventionally, three main parameters (applied voltage, flow rate and base solvent in processing polymeric media) are used to manipulate their morphologies during preparation (size, surface and porosity). In this work, an un-conventional approach is demonstrated to yield biocompatible core–shell encapsulated (poly-ε-caprolactone (PCL) and silicon oil) particles with a range of structural morphologies (i.e., spherical, hemi-spherical and oblate shaped). Retaining its advantageous single-step fabrication aspect and by using two co-axial needles, a range of collection media was used to demonstrate shape and size variation (from ~28–48 μm) using optical and scanning electron microscopy. The morphological variation is directly linked to surface tension of the collection liquid. In addition, the non-volatile and flexible nature of the oil core plays a role in geometry formation. In vitro release from these structures demonstrates significant and non-significant variations; providing pathways to control release as well mimic release profile but alter other biomedical process (e.g. ultrasound). These findings demonstrate an alternative approach to manipulate the shape of bi-phasic structures which is an important functional property in several biomedical remits (e.g. drug delivery and ultrasound). Download : Download full-size image
研究领域:
生物医学工程
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制药科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Zhi-Qiang Zhou,Yuan-Ping Liao,Jing Yang,Shan Huang,Qi Xiao,Li-Yun Yang,Yi Liu
Developing simple and sensitive non-aggregation strategy for detecting Cd 2+ is necessary for improving the selectivity and sensitivity of probe. Here, we establish a simple, rapid and ratiometric strategy for the recognition of Cd 2+ based on the formation of core-shell ZnSe/CdS structure using ZnSe quantum dots (QDs). The transformation from binary ZnSe QDs to core-shell ZnSe/CdS QDs both change the elemental composition and structure of ZnSe QDs, leading to the changes in band gap of ZnSe QDs, which could be observed in the UV–vis spectra. In the detection process, ZnSe QDs only possess absorption peak at 343 nm, the formation of ZnSe/CdS after the addition of Cd 2+ leads to the appearance of the new peak at 397 nm, while other heavy metal ions could not cause the appearance of new absorption peak. Therefore, this strategy shows good selectivity for Cd 2+ detection. Based on this strategy, the limit of detection (LOD) for Cd 2+ is 11 nM by UV–vis spectroscopy with a desirable relation of linearity (R 2 = 0.999) between A 397 /A 343 and Cd 2+ contents, which is superior to the LOD of most reported nanomaterials . The response time for Cd 2+ detection is as short as 60 s, which is suitable for rapid detection. This ratiometric probe has also been applied to the detection of Cd 2+ in tap water samples, the recovery of Cd 2+ was between 94.9% and 105.6% for tap water samples, indicating the high accuracy of our ratiometric assay. Our strategy not only provided a new method for detecting Cd 2+ , but also put forward an implication that the band energy changes of QDs caused by heavy metal ions can be applied in the selective and sensitive detection of heavy metal ions.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
COMBUSTION AND FLAME
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2021
·
IF 4.185
Kaiwen Shi,Xiaode Guo,Ling Chen,Shanshan Huang,Linlin Zhao,Jie Ji,Xiang Zhou
Metastable intermolecular composites (MICs), also called nanothermites, are attracting wide attention mainly due to the increased interfacial contact area of the fuels and oxidants therein. In this study, an alcohol-thermal technique is adopted to synthesize approximately core-shell structured Al@CuO MICs, in which process copper acetate is used as the precursor of CuO while Al powder with a wide size distribution (50 nm−5 µm in diameter) is used as cores. The energy-release characteristics of the materials are studied by performing thermal analysis, constant-volume combustion cell tests, and high-speed camera imaging of the combustion process . The results show that Al nanoparticles are surrounded by CuO nanoparticles that are with an average diameter of about 10 nm, while micron-sized Al particles are coated by a continuous layer of nanoplatelets that are assembled from CuO nanoparticles. Benefiting from the enhanced interfacial contact compared with that of ultrasonically mixed counterpart, Al@CuO shows a lower apparent activation energy of solid-state interfacial reaction, a higher light intensity, a shorter burning time, a larger pressure output, and a higher pressurization rate. It is also found that equivalent ratio has a great effect on the combustion process, and a slightly fuel-rich formulation is preferred in this study. The synthesis method developed in this study may also be adapted to the preparation of other core-shell structured MICs.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 33
·期 2
·e4708
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IF 3.581
Mingliang Ma,Yuying Yang,Dili Liao,Ping Lyu,Jinwei Zhang,Jianli Liang,Lizhi Zhang
A strategy has been developed for the synthesis, characterization and catalysis of magnetic Fe 3 O 4 /P(GMA-EGDMA)-NH 2 /HPG-COOH-Pd core-shell structure supported catalyst. The P(GMA-EGDMA) polymer layer was coated on the surface of hollow magnetic Fe 3 O 4 microspheres through the effect of KH570. The core-shell magnetic Fe 3 O 4 /P(GMA-EGDMA) modified by -NH 2 could be grafted with HPG. Then, the hyperbranched glycidyl (HPG) with terminal -OH were modified by -COOH and adsorbed Pd nanoparticles. The hyperbranched polymer layer not only protected the Fe 3 O 4 magnetic core from acid–base substrate corrosion, but also provided a number of functional groups as binding sites for Pd nanoparticles. The prepared catalyst was characterized by UV–vis, TEM, SEM, FTIR, TGA, ICP-OES, BET, XRD, DLS and VSM. The catalytic tests showed that the magnetic Fe 3 O 4 /P(GMA-EGDMA)-NH 2 /HPG-COOH-Pd catalyst had excellent catalytic performance and retained 86% catalytic efficiency after 8 consecutive cycles.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Tao Yan,Hui Ren,Qingjie Jiao,Lan Yu,Yaru Li
Nano-aluminum/nitrocellulose microspheres were fabricated using electrospray technique. Effects of solvent composition, nitrocellulose content and precursor concentration on the morphology and size distribution of the microspheres were investigated. The modified materials parameters were selected to generate RDX/nano-aluminum/nitrocellulose core-shell microspheres by electrospray with a coaxial needle. The morphology of core-shell microsphere was dependent on the relative ratio between the inner and outer flow rate as well as the applied voltage. For a system with a constant inner flow rate, there is an optimal range for the outer flow rate and the applied voltage.
研究领域:
材料科学
·
能量材料
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产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2019
·Vol. 216
·期 22
·1900379
·
IF 1.606
Liang Ma,Xuejuan Shi,Xiaoxiao Zhang,Shunjun Dong,Lili Li
Core–shell-structured cellulose acetate–polycaprolactone/chitosan (CA–PCL/CS) nanofibers with excellent removal performance of hexavalent chromium (Cr(VI)) are developed by coaxial electrospinning. The effect of core-to-shell ratio on adsorption capability is studied. The results show that all core–shell-structured fibers possess higher adsorption capability and good durability in acidic environment compared with the CS powder adsorbent. CA–PCL/CS fibers with core-to-shell ratio of 0.442 have a maximum adsorption capability of 126 mg g −1 at room temperature. The adsorption kinetics reveals that chemisorption serves as the rate-determining step by notable electron transfer, share, or exchange between adsorbents and adsorbates. The adsorption equilibrium data of the core–shell-structured CA–PCL/CS fiber adsorbents are all well described by the Freundlich isotherm model, indicating the multilayer adsorption process. Herein, it is highlighted that the core–shell-structured CA–PCL/CS nanofibers have a promising prospect in removing Cr(VI) ions from waste water.
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
RSC Advances
·
2019
·Vol. 9
·期 20
·11377-11384
·
IF 3.049
Kaili Wei,Baolai Wang,Jiamin Hu,Fuming Chen,Qing Hao,Guannan He,Yinzhen Wang,Wei Li,Junming Liu,Qinyu He
It's highly desired to design and fabricate an effective Z-scheme photo-catalyst with excellent charge transfer and separation, and a more negative conduction band edge (ECB) than O2/·O2− (−0.33 eV) and a more positive valence band edge (EVB) than ·OH/OH− (+2.27 eV) which provides high-energy redox radicals. Herein, we firstly designed and synthesized a core–shell-heterojunction-structured Z-scheme system BaTiO3@In2S3 (BT@IS, labelled as BTIS) through a hydrothermal method, where commercial BT was used as the core and In(NO3)3·xH2O together with thioacetamide as the precursor of IS was utilized as the shell material. In this system, the shell IS possesses a ECB of −0.76 eV and visible-light-response Eg of 1.92 eV, while the core BT possesses a EVB of 3.38 eV, which is well suited for a Z-scheme. It was found that the as-prepared BTIS possesses a higher photocatalytic degradation ability for methyl orange (MO) than commercial BT and the as-prepared IS fabricated by the same processing parameters as those of BTIS. Holes (h+) and superoxide radicals (·O2−) were found to be the dominant active species for BTIS. In this work, the core–shell structure has inhibited the production of ·OH because the shell IS has shielded the OH− from h+. It is assumed that if the structure of BTIS is a composite, not a core–shell structure, ·OH could be produced during photocatalysis, and therefore a higher photocatalytic efficiency would be obtained. This current work opens a new pathway for designing Z-scheme photocatalysts and offers new insight into the Z-scheme mechanism for applications in the field of photocatalysis.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhibin Zhang,Yajun Wang,Zheng Li,Hiroshi Fu,Jianying Huang,Zhiwei Xu,Yuekun Lai,Xiaoming Qian,Songnan Zhang
As an effective way to obtain freshwater resources, atmospheric water harvesting (AWH) technology has been a wide concern of researchers. Therefore, hydrogels gradually become key materials for atmospheric water harvesters due to their high specific surface area and three-dimensional porous structure. Here, we construct a core–shell hydrogel-based atmospheric water harvesting material consisting of a shell sodium polyacrylate (PAAS) hydrogel with an open pore structure and a core thermosensitive poly N-isopropylacrylamide (PNIPAAm) hydrogel with a large pore size. Theoretically, the mutual synergistic hygroscopic effect between the core layer and the shell layer accelerates the capture, transport, and storage of moisture to achieve continuous and high-capacity moisture adsorption. Simultaneously, the integration of polydopamine (PDA) with the hydrogel realizes solar-driven photothermal evaporation. Therefore, the prepared core–shell hydrogel material possesses great advantages in water adsorption capacity and water desorption capacity with an adsorption of 2.76 g g–1 (90% RH) and a desorption of 1.42 kg m–2 h–1. Additionally, the core–shell structure hydrogel collects 1.31 g g–1 day–1 of fresh water in outdoor experiments, which verifies that this core–shell hydrogel with integrated photothermal properties can capture moisture in a wide range of humidity without any external energy consumption, can further sustainably obtain fresh water in remote water-shortage areas.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Nannan Chen,Lianzhu Lin,Weizheng Sun,Mouming Zhao
In this study, we examined the possibility of preparing stable soy protein nanogels by simply heating homogeneous soy protein dispersion. The protein nanogels formed were characterized by z-average hydrodynamic diameter, polydispersity index, turbidity, ζ-potential, morphology, and their stability to pH and ionic strength change. Soy protein dispersion (1% w/v) was homogeneous around pH 5.9 where it had the lowest polydispersity index (∼0.1). Stable and spherical nanogels were formed by heating soy protein dispersion at pH 5.9 under 95 °C. They sustained constantly low polydispersity index (∼0.1) in the investigated pH range of 6.06–7.0 and 2.6–3.0. The nanogels were pH-sensitive and would swell with pH change. They were stable at 0–200 mM NaCl concentration. Denaturation of soy glycinin was the prerequisite for the formation of stable nanogels. Soy protein nanogels had a core–shell structure with basic polypeptides and β subunits interacting together as the hydrophobic core; and acid polypeptides, α′, and α subunits locating outside the core as hydrophilic shell. The inner structure of soy protein nanogels was mainly stabilized by disulfide bonds cross-linked network and hydrophobic interaction. Soy protein nanogels made in this study would be useful as functional ingredients in biotechnological, pharmaceutical, and food industries.
研究领域:
食品科学
·
生物材料学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）