PACKAGING TECHNOLOGY AND SCIENCE
·
2018
·Vol. 31
·期 11
·747-753
·
IF 1.808
Hong-Biao Chen,Chang-Ying Hu
Polypropylene nanocomposites have great potential applications in food packaging and the evaluation of the migration of nanoparticles is important for the food safety. Three types of polypropylene (homopolymer of polypropylene, PPH; blockcopolymer of polypropylene, PPB; random copolymer of polypropylene, PPR) nanocomposite films with or without coupling agent were tested in 3% acetic acid as food simulant. The migration amount of zinc was quantified by inductively coupled plasma atomic emission spectroscopy. The surface morphology and crystallinity were explored by field emission scanning electron microscopy, atomic force microscopy, and differential scanning calorimetry, respectively. The results showed that the incorporation of titanate coupling agent could inhibit ZnO-NPs migration from the films since titanate coupling agent could improve the interface between ZnO-NPs and PP molecular chain segment. Furthermore, the migration rate of zinc was dependent on the degree of crystallinity ( X c ) of PP and their order of the maximum migration rate was PPH, PPB and PPR. The notable phase separation could be observed from the morphology of nano-ZnO/PPH, while ZnO-NPs could be well dispersed in the PPR matrix. Thus, ZnO-NPs restricted the molecular chain segment of PPH and reduced its X c from 88.6% to 73.2%. The results demonstrated that titanate coupling agent and PPR could inhibit the migration of ZnO-NPs significantly.
研究领域:
食品安全
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聚合物纳米复合材料
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材料科学
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迁移研究
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DOI
高影响因子
ACS Applied Energy Materials
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2022
·
IF 6.959
Fan-Bo Meng,Xiangrong Chen,Yiwen Shi,Zelin Hong,Hanshan Zhu,Awais Muhammad,Ashish Paramane,Yufen Wang,Ruobin Huang,Xuejiao Deng
The interface insulation plays a key role in the long-distance high-voltage direct current (HVDC) cables. In this paper, four core–shell ZnO suspensions formed by different alkane coating were prepared for spraying on the factory joint interface. The chemical, electrical, and simulation studies were performed on synthesized nanoparticles and factory joint samples. Results show that the alkane-coated ZnO exhibits a noticeable surface halo and the thermal weight loss ratio increases with the increase of the alkane chain. Moreover, with the increase in the sprayed C1-ZnO concentration (coated by trimethoxymethylsilane) from 0.005 to 0.1 wt%, the insulating properties of the samples show an increasing trend at first and then decrease. Furthermore, as the encapsulated alkane chain increases, a very small concentration of 0.01 wt% of ZnO suspension (C6-ZnO) coated with hexyltrimethoxysilane was found to be a highly effective spray reagent, which can significantly reduce the DC electrical conductivity, increase the DC breakdown strength, and remarkably inhibit the space charge accumulation at the interface. The microscopic characterization showed a good dispersion of nanoparticles at the interface. The space charge simulation and molecular simulation results elucidated the mechanism of the interfacial nanoparticles to suppress the space charge and insulation property improvement. This approach provides a new solution for realizing 500 kV or higher voltage DC cables to achieve long-distance connections and breakpoint repairs or improve other polymer interface insulation.
研究领域:
电气工程
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材料科学
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高电压绝缘技术
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纳米复合材料
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Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 12
·1932-1943
·
IF 11.534
Fan Shengjie,Sun Tingting,Jiang Meng,Gu Shijia,Wang Lianjun,Yan Haixue,Jiang Wan
As a high-temperature thermoelectric (TE) material, ZnO offers advantages of non-toxicity, chemical stability, and oxidation resistance, and shows considerable promise as a true ready-to-use module under air conditions. However, poor electrical conductivity and high thermal conductivity severely hinder its application. Carbon nanotubes (CNTs) are often used as a reinforcing phase in composites, but it is difficult to achieve uniform dispersion of CNTs due to van der Waals forces. Herein, we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition (CVD) technology, in order to improve their electrical conductivity and mechanical properties, as well as reducing the thermal conductivity. Meanwhile, magnetic nickel (Ni) nanoparticles are introduced as catalysts for promoting the formation of CNTs, which can also enhance the electrical and thermal transportation of ZnO matrices. Notably, the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm −1 due to the formation of dense and uniform conductive CNT networks. The lattice thermal conductivity ( κ L ) is obviously declined by the intensification of phonon scattering, resulting from the abundant grain boundaries and interfaces in ZnO-CNT composites. Importantly, the maximum dimensionless figure of merit ( zT ) of 0.04 at 800 K is obtained in 2.0% Ni-CNTs/ZnO, which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic method. In addition, the mechanical properties of composites including Vickers hardness ( HV ) and fracture toughness ( K IC ) are also reinforced. This work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xinrui Song,Jiaming Wen,Xiaohua Li,Jizhao Zou,Chaobo Yan,Xierong Zeng
The commercial applications of lithium metal anodes are still hindered by safety concerns resulting from uncontrollable lithium dendrite growth and serious volume changes during the discharge and charge processes. In this study, N-rich hollow porous carbon nanofibers decorated with various zinc oxide morphologies as the lithiophilic phase are fabricated through simple coaxial-electrospinning. The ZnO nanostructure gradually changes from small nanoparticles to needle-like structures with increasing Zn(Ac) 2 fraction, resulting in lithiophilic to lithiophobic scaffold transfer, owing to current density concentration, long Li ion diffusion distances, and inhomogeneous Li deposition behavior with ZnO needle-like shapes. The small ZnO nanoparticles on the NHCNF as the Li metal deposition scaffold also efficiently reduce the local current density and guide the Li ions to homogenously nucleate and deposit. The hollow porous structure provides ultra-high Li metal space accommodation, which can prevent uncontrollable Li dendrite growth. These excellent scaffold characteristics display a high Columbic efficiency of 97% after 150 cycles at 1 mA cm −2 and a stable cyclic lifespan of 1000 cycles in the symmetrical cells, even at a super high current density of 5 mA cm −2 on the 5-ZnO@NHCNF/Li composite anode, full cells coupled with an LiFePO 4 commercialized cathode deliver excellent cyclic and rate performance.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Gang Shu,Dan Xu,Songtao Xie,Li-Jen Chang,Xinyue Liu,Jianqing Yang,Yunchun Li,Xianxiang Wang
This study aimed to develop a novel ZnO-quantum dots-Chitosan biocomposite dressing (CS-ZnO QDs) with improved antioxidant, antibacterial, and potential infected wound healing effects. CS-ZnO QDs were synthesized successfully by incorporating ZnO QDs into chitosan, and in vitro antioxidant, antibacterial and anti-biofilms tests were conducted. Furthermore, the therapeutic effects of CS-ZnO QDs for infected wound healing were investigated. The results of the character study revealed steady compatibility between chitosan and ZnO QDs. Nonetheless, the in vitro antioxidant and antibacterial studies showed that CS-ZnO QDs had better antioxidant activity, inhibitory effects against methicillin-resistant Staphylococcus aureus (MRSA), and a vigorous eradication of bacterial biofilms compared to ZnO-QDs and CS alone. CS-ZnO QDs presented stable cyto-compatibility in NIH/3T3s cells. In addition, CS-ZnO QDs facilitated MRSA-infected wound healing by inhibition of bacterial growth, regulation of the NFκB-p65 pathway to alleviate inflammation, improve wound repairing in an adequate environment, and directly enhance re-epithelialization and collagen deposition.
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Nanoscale Advances
·
2023
·Vol. 5
·期 7
·1936-1942
·
IF 4.7
Xiujuan Chen,Shaobo Du,Lei Gao,Kejin Shao,Zhan Li,Bin Liu
The effectiveness of photocatalysts can be impacted by the high compounding efficiency of photogenerated carriers, which depends on the morphology of the photocatalyst. Here, a hydrangea-like N–ZnO/BiOI composite has been prepared for achieving efficient photocatalytic degradation of tetracycline hydrochloride (TCH) under visible light. The N–ZnO/BiOI exhibits a high photocatalytic performance, degrading nearly 90% of TCH within 160 min. After 3 cycling runs, the photodegradation efficiency remained above 80%, demonstrating its good recyclability and stability. The major active species at work are superoxide radicals (·O2−) and photo-induced holes (h+) in the photocatalytic degradation of TCH. This work provides not only a new idea for the design of photodegradable materials but also a new method for the effective degradation of organic pollutants.
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DOI
PubMed
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 7
·2201093
·
IF 7.9
Xiaohong Ma,Danyang Li,Jun Xie,Jian Qi,Huacheng Jin,Liuyang Bai,Hao Zhang,Feifei You,Fangli Yuan
The reduction of CO 2 to chemical fuel driven by solar energy can not only meet the growing demand for renewable energy, but also balance the carbon cycle in nature. However, the current photocatalysts have low CO 2 conversion due to their poor light capture ability, narrow light response range, and high recombination probability of photogenerated carriers. Herein, a heterogeneous photocatalyst of hollow structured ZnO/ZnS decorated with Pt nanoparticles is synthesized through the hydrothermal process and photodeposition method, showing excellent photocatalytic activity for CO 2 reduction in long-time stability and ≈100% CO selectivity, which can mainly contribute to natural enhanced light-capture ability of the hollow confined space due to multiple reflection and scattering of light in the cavity, thus improving separation efficiency of photogenerated charge carriers due to the type II junction constructed between ZnO and ZnS and the additional reaction active sites after decorating Pt nanoparticles in the surface of the hollow structure.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·2169-2183
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IF 4.186
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Zuqing Zhu,Jianda Xu,Jinbiao Liu
In this study, a new type of ceramic composite (PZSC/ZnO) was successfully synthesized using N, P, and S co-doped carbon microspheres derived from polyphosphazene with zinc oxide. The morphology and structure were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, Raman, X-ray diffraction, BET, and thermogravimetric. Batch experiments were used to explore the adsorption performance under different pH values, initial concentrations, contact times, and temperatures. The results showed that the maximum adsorption capacity of the PZSC/ZnO ceramic composite for uranium was 470.5 mg/g (pH = 5.5, t = 40 min, and T = 25°C). The adsorption process followed the nonlinear Langmuir model and the pseudo-second-order kinetic model, demonstrating that the monolayered combination of U(VI) with the PZSC/ZnO ceramic composite and the adsorption mechanism was chemical adsorption. Thermodynamic data revealed that the adsorption was a spontaneous endothermic process. Furthermore, P and N may be involved in the adsorption of uranyl ions through binding to the O atoms from ZnO. The main forces between U(VI) and the PZSC/ZnO ceramic composite were attributed to ZnO and heteroatoms doped in the material.
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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
·
2023
·
IF 5.1
Y.J. Xu,Y. Ma,Y.C. Xie,Y. Zhou,H. Zhang,G.Y. Huang
Aramid fabrics are widely used for human protection due to their high strength and softness. Recent studies have shown that growing ZnO nanoparticles on fibers improves the mechanical properties of the fabrics. In this work, the process for preparation of ZnO-modified aramid fabrics was optimized. The mechanical properties and interyarn friction of ZnO-modified fabrics increased with increasing concentration of preparation solution and upon addition of coupling agent. The ballistic properties of the ZnO-modified fabric were improved compared with those of unmodified fabric. In particular, Z2 fabric (with added coupling agent) showed the best ballistic performance based on areal density. The ballistic limiting velocities of the single-layer, 2-layer, and 3-layer Z2 fabrics were 109.1%, 98.3%, and 67.8% higher than that of unmodified fabric, and the areal density was only increased by 8.2%. Compared with 2-layer and 3-layer unmodified fabrics, the ballistic limiting velocities of single-layer and 2-layer Z2 fabric were increased by 16% and 35.6%, respectively, and the areal densities were reduced by 45.9% and 27.9%. The results of simulations and ballistic tests were consistent, indicating that ZnO modification improved the ballistic performance of the fabrics by increasing interyarn friction and tensile properties of the fabric.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Yin Zhang,Yanping Huang,Bingqun Lin,Zupeng Chen,Xinwu Xu,Mingzhu Pan
Photocatalytic degradation is an eco-friendly technology for volatile organic compound (VOC) removal, but searching for a highly efficient photocatalyst system remains a challenge. Here, a novel photocatalyst , ZnO/Ti 3 C 2 T X composite, was developed by the electrostatic deposition strategy, wherein Ti 3 C 2 T X nanosheets serve as a support to provide abundant surface-active sites for loading ZnO spheres and adsorbing VOC molecules. Furthermore, successive catalytic centers are formed to enlarge the photocatalytic reaction interface , thereby minimizing the photogenerated electron transfer distances. Moreover, a Schottky heterojunction was successfully formed between the ZnO spheres and Ti 3 C 2 T X nanosheets , which further suppressed the recombination of photogenerated electron–hole pairs. As a result, the ZnO/Ti 3 C 2 T X composite exhibited enhanced photocatalytic activity , universality and stability in VOCs degradation. The photodegradation efficiencies of formaldehyde, methyl alcohol and acetone were as high as 91 %, 84 % and 80 % by ZnO/Ti 3 C 2 T X composite, respectively. The pseudo-first-order kinetic constant of formaldehyde decomposition on ZnO/Ti 3 C 2 T X was 2.69 times greater than that on pristine ZnO. This work presents a novel photocatalyst system of ZnO/Ti 3 C 2 T X composite and provides an insight for the development of highly efficient photocatalysts for the degradation of VOCs.
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Materials
·
2022
·Vol. 15
·期 9
·3408
·
IF 3.748
Leilei Zhang,Yihua Lv,Xiaoyun Ye,Lian Ma,Song Chen,Yuping Wu,Qianting Wang
In this study, zinc oxide (ZnO)/polypyrrole (PPy) composites with flower- and rod-like structures were successfully fabricated by in situ polymerization and the hydrothermal method and used as microwave absorption (MWA) materials. The surface morphologies, crystal structures, and electromagnetic features of the as-prepared samples were measured by field-emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and vector network analyzer (VNA). The results show that the conductive polymer PPy was successfully decorated on the surface of ZnO substrates. The MWA ability of flower- and rod-like ZnO/PPy composites is significantly enhanced after introduction of PPy. Rod-like ZnO/PPy composites exhibited superior MWA properties than those of flower-like ZnO/PPy. The former achieved a minimum reflection loss (RLmin) of −59.7 dB at 15.8 GHz with a thickness of 2.7 mm, and the effective absorption bandwidth (EAB,RL< −10 dB) covered 6.4 GHz. PPy addition and stacked structure of rod-like ZnO/PPy composites can effectively improve the dielectric properties, form multiple reflections of incident electromagnetic waves, and generate an interfacial polarization effect, resulting in improved MWA properties of composite materials.Keywords:ZnO;polypyrrole;composites;microwave absorption;dielectric loss
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高影响因子
PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Wei Zhang,Xinhui Yang,Zhiwei Qu,Zirui Liu,Youjin Zheng,Xiangmin Zhao,Xue Wang
Ga-doped ZnO (GZO) powders were synthesized by chemical coprecipitation . GZO powders were annealed in O 2 , Ar, N 2 , and H 2 atmosphere, and the effects of annealing atmosphere on their structure, optical and electrical properties were systematically studied. The results show that the optical and electrical properties of GZO powder were highly influenced by annealing atmosphere. GZO annealed in Ar, N 2 , H 2 atmosphere have excellent electrical resistivity, while GZO annealed in O 2 atmosphere has poor electrical resistivity. According to the annealing contrasted of GZO in different atmosphere, the lower resistivity of GZO is, the lower reflectivity will be. The blue shift of ultraviolet emission (385 nm) in photoluminescence of GZO is related to oxygen vacancy (V O ) and doped Ga, the blue and green emissions (around 500 nm) are originated from V O defects. The density of V O defects and the effective doping rate of Ga will be enhanced when GZO annealed in Ar, N 2 , H 2 atmosphere.
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