JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 31
·15238-15251
·
IF 3.553
Guan Lizhu,Weng Ling,Zhang Xiaorui,Wu Zijian,Li Qiong,Liu Lizhu
Two kinds of 1D core–shell nanorods silver@polydopamine (Ag@PDA) and silver@zinc oxide (Ag@ZnO) were successfully synthesized and doped into polyvinylidene fluoride (PVDF) to fabricate composites. The different surface modification effects between the organic PDA shell and inorganic ZnO shell on structure and dielectric properties of PVDF composites were investigated. Results indicated that the ZnO shell showed a crystalline structure, while the PDA shell is amorphous. Due to the difference in crystal structure of the coating shell, the Ag@ZnO/PVDF composites showed a better dielectric performance than the Ag@PDA/PVDF composites, while the Ag@PDA/PVDF showed excellent mechanical properties. The crystallized structure of ZnO not only promoted the crystal conversion of PVDF molecules, but also effectively limited the movement of charge carriers in composites. In the case of 10wt% fillers' content and before breakdown strength, the energy storage densities of Ag@PDA/PVDF and Ag@ZnO/PVDF composites are 79.53% and 209.2% higher than that of pure PVDF films, respectively. Moreover, the charge/discharge efficiency of Ag@ZnO/PVDF composite is also higher than that of pure PVDF and Ag@PDA/PVDF composite. When testing at 1800 kV/cm electrical strength, the energy storage density of Ag@ZnO/PVDF composite increases to 4.02 J/cm 3 .
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Zihao Wei,Xiaomin Zhang,Tianqi Cao,Tian Luo,Yuanjing Sun,Zihan Jin,Changhu Xue
Quercetin (Que) and resveratrol (Res) exhibit significant synergistic effects in multiple health benefits. However, their sites of action in the gastrointestinal tract are not consistent. To achieve the targeted release of Que and Res into the small intestine and colon, respectively, core–shell–shell nanoparticles with programmed sequential release properties were constructed by layer-by-layer assembly technique in this work. Compared with hordein/pectin nanoparticles, hordein/pectin/carboxymethyl chitosan nanoparticles (HPCCS NPs) possessed higher physicochemical stability, encapsulation efficiency and loading capacity. Besides, the existence of CCS layers also significantly improved the co-delivery and programmed sequential release properties. To further optimize the performance of NPs, ultrasonic treatment was innovatively applied to Que/Res–HPCCS NPs. It was found that ultrasonic treatment enhanced the hydrogen bonding, hydrophobic interactions and electrostatic adsorption between molecules, thus improving the physicochemical stability, encapsulation efficiency and loading capacity of NPs. Furthermore, in vitro simulated gastrointestinal studies demonstrated that Que/Res–HPCCS NPs (ultrasound) had better programmed sequential release properties, which further improved the release rates of Res and Que in the small intestine and colon, respectively. This study is of great significance for the development of co-delivery systems with programmed sequential release of nutraceuticals, which can provide novel ideas for the development of related functional foods.
研究领域:
食品科学
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生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qianqian Jia,Man Li,Zhenguo An,Ping Wang,Jingjie Zhang
Divisional shell design is a promising strategy to synergize low density, high structural stability, and tunable functionality of hollow microsphere, but detailed study on the role of different shell sections in determining the overall property is lacking. In this work, glass and cobalt are model structural support and electromagnetically functional materials, respectively, of hollow microsphere with a Janus shell structure (glass-cobalt dually layered shell). The glass and cobalt layers serve as the inner and outer sides, respectively, and the effects of their content ratio on the density, mechanical strength, and electromagnetic functionality were studied. It is found that the functional performance depends more largely on the cobalt layer and the glass layer contributes more to the mechanical strength, while a remarkable improvement of the mechanical strength has also been observed with the presence of the functional cobalt layer. Simply by varying the content ratio of the two layers, the electromagnetic property can be tailored in a wide range with the same overall density. When employed as electromagnetic fillers, the Janus shell hollow microspheres exhibit microwave shielding and absorbing performances that can also be reliably adjusted via regulation of the content ratio of the two layers in the Janus shell.
研究领域:
材料科学
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电磁工程
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机械工程
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 31
·25656-25661
·
IF 3.289
Zhixiang Jiang,Katarzyna Matras-Postolek,Ping Yang
Several kinds of hydrophobic quantum dots (QDs) including CdSe, CdTe, CdSe/CdxZn1−xS, and CdTe/CdSe/ZnSe were fabricated via organic synthesis to observe morphology variation during shell coating. CdSe QDs prepared at a relatively high temperature revealed a hexagonal structure and rod morphology. On being coated with a CdxZn1−xS shell, tetrahedron and rod morphologies were observed. It was found that the reaction temperature and injection rate play important roles. The photoluminescence properties of the core/shell QDs depended strongly on their preparation conditions such as temperature and ligands. For CdSe cores created at a relatively low temperature, CdxZn1−xS shell coating resulted in the formation of cubic CdSe/CdxZn1−xS core/shell QDs. This is ascribed to the role of a CdS interlayer. In contrast, multishell CdTe/CdSe/ZnSe QDs revealed a spherical morphology. Furthermore, the self-assembly of QDs with hexagonal structures occurs while regular assembled structures were not observed for QDs with a cubic morphology according to their transmission electron microscopy images. This is ascribed to a dipole force between QDs. This phenomenon is just related to the morphology and crystal structures rather than their composition.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 8
·期 1
·2001606
·
IF 4.948
Zuohao Wen,Yujie Ke,Chengchen Feng,Shuliang Fang,Miuyang Sun,Xinghai Liu,Yi Long
The VO 2 -based smart windows can dynamically and reversibly adjust the indoor solar irradiation to reduce the energy consumption for building glasses. This paper reports the first successful preparation of Mg-doped VO 2 @ZrO 2 core−shell nanocrystals with promoted thermochromic performance as well as tunable appearance and wettability. The achieved combination of T lum of 52.4% and ∆ T sol of 7.1% is comparable to the best-reported results of VO 2 -based core−shell rod structures. The thickness of ZrO 2 shell is tunable between 3 and 14 nm, resulting in a slightly hydrophobic surface and a slight color change toward blue-green and brighter produced films. The preparation method based on hydrothermal and UV-curing methods is facile. This work may inspire future development of VO 2 synthesis, their structure−property, and the application the thermochromic films for energy-saving purposes in buildings or automobiles.
研究领域:
材料科学
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能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Minghao Zhou,Shijiao Zhang,Yanlai Wang
By employing semiconductor composite strategies and morphology control, Zn-doped CuInS 2 quantum dots with a ZnS shell structure (ZCIS@ZnS QDs) have been synthesized and combined with TiO 2 nanowires or nanoparticles (NWs/NPs) for photodetector applications. In the composite material, the QDs are uniformly attached to the surface of TiO 2 NWs/NPs. The photodetector constructed with ZCIS@ZnS QDs and TiO 2 NWs/NPs (ZCIS@ZnS@TiO 2 NWs/NPs) demonstrated superior photodetection performance. It exhibited excellent responsivity (∼6.2 mA/W) and detectivity (∼1.6 × 10 12 Jones) under ultraviolet (UV) illumination (∼365 nm). This non-toxic and environmentally friendly composite material provides a promising alternative for applications in various fields.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 5
·581
·
IF 2.881
Linyuan Lian,Youyou Li,Daoli Zhang,Jianbing Zhang
InP quantum dots (QDs) are promising down-conversion phosphors for white light LEDs. However, the mainstream InP QDs synthesis uses expensive phosphorus source. Here, economic, in situ-generated PH3is used to synthesize InP QDs and a two-step coating of ZnS shells is developed to prepare highly luminescent InP/ZnS/ZnS QDs. The QDs show a photoluminescence quantum yield as high as 78.5%. The emission can be tuned by adjusting the halide precursor and yellow emissive InP/ZnS/ZnS QDs are prepared by judiciously controlling the synthetic conditions. The yellow QDs show suppressed thermal quenching and retain >90% room temperature PL intensity at 150 °C for the growth solution. Additionally, the PL spectrum matches with the eye sensitivity function, resulting in efficient InP QD white light LEDs.Keywords:InP;quantum dots;core/shell;InP/ZnS;thermal quenching
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 121
·期 21
·
IF 2.068
Wang Qiming,Li Shourui,Peng Fang,Lei Li,Hu Qiwei,Wang Pei,Nan Xiaolong,Liu Jing,Zhu Wenjun,He Duanwei
When the grain size decreases, there inevitably exists a critical size ( d c ) where the contribution of surface atoms to the physical properties is competitive with that of the interior atoms, giving rise to a wide variety of new phenomena. The behavior of granular materials near d c is particularly interesting because of the crossover, a continuous transition from one type of mechanism to another. In situ high-pressure x-ray diffraction experiments showed that the compression curve of nanocrystalline anatase TiO 2 with grain size near d c reached a platform after about 5%–6% of deformation under hydrostatic compression. Eventually, the unit cell volume of anatase expanded at ∼14–16 GPa. We propose that the anomalous compression behavior is attributed to the formation and thickening of the stiff high density amorphous shell under high pressure, giving rise to a great arching effect at the grain boundary at the nanolevel. This process results in a remarkable difference in stress between inside and outside of the shell, generating the illusions of the hardening and the negative compressibility. This study offers a new insight into the mechanical properties of nanomaterials under extreme conditions.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 12
·1947-1952
·
IF 1.889
Wu Han,Zhou Liyan,Yan Shancheng,Song Haizeng,Shi Yi
Recently, layered IV–VI metal monochalcogenides have attracted a lot of attention because of their unique properties. Among them, tin monoxide (SnO) has been widely studied as thin films for the application in high-mobility p-channel transistor and photoelectricity device
fabrication. In this work, we successfully synthesized SnO nanoshells through a facile solution chemical method. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images confirmed the morphology of these nanoshells. The surface chemical composition was investigated
by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Raman and photoluminescence spectra were used to study the optical properties of nanoshells with different sizes, which were formed in different concentrations. We found that the special nanostructure may result in abundant
Sn or O vacancies on the surface of nanoshells, and these defects resulted in a broad photoluminescent signal. This work provided a solution synthesis method to prepare SnO and other IV–VI metal monochalcogenides as well as their promising applications in optical device.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12801-12810
·
IF 3.553
Cao Sheng,Dai Chencheng,Yao Shangfei,Zou Bingsuo,Zhao Jialong
In recent years, light-emitting Mn 2+ -doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn 2+ d–d emission. Herein, highly efficient colloidal Mn 2+ -doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn 2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn 2+ emission can be adjusted by changing the doping level of Mn 2+ . In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn 2+ ions changed by the doping concentration. The PL intensity of Mn 2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn 2+ -doped Cd–In–S NCs as a color conversion material. The Mn 2+ -doped multicomponent semiconductor NCs reported here extend the availability of classical Mn 2+ -doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiayi Chen,Xu Li,Bo Ma,Xudong Zhao,Yantao Chen
The inferior performance of non-precious metals on electrocatalytic hydrogen evolution can be mainly attributed to the inappropriate adsorption strength of intermediates. A core–shell heterostructure of CoP@Ni is developed by hydrothermal reaction, thermal phosphorization and subsequent electrodeposition, with metallic Ni supported by CoP nanowire array. The as-prepared CoP@Ni core–shell heterostructure nanowire array has a superior activity on hydrogen evolution in alkaline electrolyte, with an overpotential of 71 mV to drive 10 mA cm −2 and a Tafel slope of 66 mV dec -1 . The electronic structure of CoP@Ni is tuned for modulating the adsorption strength of intermediates. The theoretical calculations reveal that CoP@Ni has metallic characteristics with a zero-bandgap, which leads to the promoted charge transfer. More importantly, the intrinsic activity of CoP@Ni is greatly increased, with a lower energy barrier in the reaction pathway. This work points out the importance of constructing the heterostructure for improving the intrinsic activity, which can pave the way to the exploration of high-performance and cost-effective electrocatalysts for hydrogen production.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2024
·
IF 6.1
Xiuli Wang,Qilin Guo,Jia Guo,Changchun Wang
Rapid extraction and screening of high purity DNA fragments is an indispensable technology in advanced molecular biology. In this article, mesoporous magnetic composite microspheres (MSP@mTiO2) with tunable pore sizes are successfully fabricated for high purity DNA extraction and fragment screening. Due to the strong complexation ability of Ti4+ with DNA phosphate groups and the high specific surface area of mesoporous microspheres, the MSP@mTiO2 microspheres possess excellent adsorption performance, the saturated loading capacity of MSP@mTiO2 with specific surface area of 122 m2/g is as high as 575 g/mg for salmon sperm specimen. ITC experiment demonstrates that the DNA adsorption on MSP@mTiO2 microspheres is mainly driven by entropy, which gives us more potential ways to regulate the balance of adsorption and desorption. Meanwhile, the mesoporous MSP@mTiO2 microspheres exhibit much higher extraction efficiency compared with non-porous MSP@TiO2 for whole genome DNA from Arabidopsis thaliana plants. Interestingly, the DNA frangements with different lengths can be screened by simply regulating the pore size of MSP@mTiO2 or concentration of Na3PO4 in eluent. Small pore size and low phosphate concentration are advantageous for the extraction of short-stranded DNA fragments, the DNA fragments (≤1000 bp) can be efficiently extracted when the mesopore size of MSP@mTiO2 is lower than 7.6 nm. The extraction results from the mesoporous composite microspheres provide new promising insights on the DNA purification and screening from complex biological samples.
研究领域:
分子生物学
·
材料科学
✓ 已验证
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）