POLYMER INTERNATIONAL
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2018
·Vol. 67
·期 8
·1003-1010
·
IF 2.352
Yangyang Wang,Zhiping Zhou,Wanzhen Xu,Yu Luan,Yi Lu,Yanfei Yang,Tianshu Liu,SongJun Li,Wenming Yang
This work describes the preparation of molecularly imprinted polymers using ZnO quantum dots, which were used for the selective detection of diethylhexyl phthalate (DEHP). Methacrylic acid, ethylene glycol dimethacrylate, 2,2′-azobis(2-methylpropionitrile) and ZnO were used as functional monomer, crosslinker, initiator and optical material, respectively. Molecularly imprinted polymers were successfully synthesized, and the linear relationship between fluorescence intensity and amount was from 0.5 to 40 µmol L −1 for DEHP. The coefficient of correlation was 0.9923 and the imprinting factor was 11.16. The results were above 97.50% and relative standard deviation below 3.86% for the detection of DEPH in actual water samples. This study could provide a novel method using molecularly imprinted polymers for highly selective and sensitive detection of DEHP. © 2018 Society of Chemical Industry
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Materials
·
2018
·Vol. 11
·期 5
·780
·
IF 2.467
Xiaodong Sun,Guangyan Ma,Xuliang Lv,Mingxu Sui,Huabing Li,Fan Wu,Jijun Wang
In this study, Fe3O4/ZnO core–shell nanocomposites were synthesized through a chemical method of coating the magnetic core (Fe3O4) with ZnO by co-precipitation of Fe3O4with zinc acetate in a basic medium of ammonium hydroxide. The phase structure, morphology and electromagnetic parameters of the Fe3O4/ZnO core–shell nanocomposites were investigated. The results indicated that the concentration of the solvent was responsible for controlling the morphology of the composites, which further influenced their impedance matching and microwave absorption properties. Moreover, Fe3O4/ZnO nanocomposites exhibited an enhanced absorption capacity in comparison with the naked Fe3O4nanospheres. Specifically, the minimum reflection loss value reached −50.79 dB at 4.38 GHz when the thickness was 4.5 mm. It is expected that the Fe3O4/ZnO core–shell structured nanocomposites could be a promising candidate as high-performance microwave absorbers.Keywords:core–shell structure;electromagnetic absorption;interfacial polarization;Fe3O4;ZnO
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PubMed
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Zhen Li,Libo Yu
Mn-Cd x Zn 1-x Se@ZnO multi-shelled (including single-shelled, double-shelled, and triple-shelled) hollow microspheres (HMS) were successfully synthesized for application in quantum dots sensitized solar cell (QDSSC). The influence of shell numbers on photovoltaic performance of QDSSC were investigated. The results showed that larger surface area, repeated light reflection and reinforced light scattering can be achieved with triple-shelled HMS, which can improve light harvesting efficiency. Furthermore, midgap state created by Mn-doping in Cd x Zn 1-x Se will facilitate electrons injection and collection from excited Cd x Zn 1-x Se quantum dots (QDs) to ZnO. The multi-shelled effects and Mn-doping finally improve the short-circuit current (J sc ) of Mn-Cd x Zn 1-x Se@ZnO tripled-shelled HMS solar cell to 20.21 mA cm −2 , leading to the power conversion efficiency significantly enhanced to 3.39%.
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Journal of Energy Storage
·
2024
·
IF 8.9
Zhangxinyu Zhou,Yaoqi Huang,Qiang Shen,Yuanyuan Li,Xiaomin Cheng
The significant importance of developing phase change materials (PCMs) lies in their capability to meet diverse usage needs, particularly in the sphere of solar energy utilization. In this work, a thermal storage substrate was formed by adsorbing stearic acid in a biocarbon skeleton via vacuum impregnation. A composite PCM with multifunctional properties was subsequently synthesized by modifying the carbon mesh with copper sulfide (CuS) and zinc oxide (ZnO), compounding it onto the surface of the heat storage substrate. The biocarbon skeleton possesses a well-graded pore structure , which offers a significant number of channels for efficient heat transfer and effective electromagnetic shielding . The composite PCM retained a latent heat exceeding 155 J·g −1 . The integration of the biocarbon skeleton and modified carbon mesh led to a remarkable 119.42 % enhancement in thermal conductivity within the composite system , as compared to pure stearic acid. Furthermore, granular ZnO and nanoflower-like CuS are effectively integrated on the surface of the carbon mesh, facilitating the formation of localized surface heterojunctions . The composite system exhibits excellent broad-spectrum light absorption capability, producing a significantly elevated photothermal conversion efficiency of 88.93 %. Moreover, the semiconductor effect contributes to a remarkable degradation efficiency of 99.33 % for methylene blue . Significantly, the composite material demonstrates exceptional electromagnetic shielding capability, yielding a total shielding effectiveness exceeding 40 dB. The composite system also demonstrated outstanding thermal and cycling stability, with a negligible latent heat loss of merely 1.9 % even after undergoing 500 thermal cycles. This work proposes a pragmatic methodology to accomplish the functional integration of PCMs.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lei Li,Guolan Wei,Hengji Liu,Yongde Guo,Yingying Ma
Traditional nanofiber-hybrid proton exchange membranes (PEMs) are limited in their further application due to differences in proton conductivity between vertical and horizontal orientations. In this study, we design and synthesize a novel type aminated flower-shaped ZnO@Al 2 O 3 nanofibers and then filling its three-dimensional interstices with sulfonated polysulfone (SPSF) to obtain a nanofiber composite proton exchange membrane (ZANFs/SPSF). The Al 2 O 3 nanofibers provide long-range and stable proton transport nanochannels in plane, while the flower-shaped ZnO on its surface provide additional vertical transport channels for protons. This combination of 1D and 2D conductive pathways forms a typical 3D hierarchical proton conductive configuration, optimizing the proton transfer pathway. Specifically, the amino groups (-N-H) on the nanofibers surface not only form acid-base pairs with sulfonic acid groups (-SO 3 H), providing a rich hydrogen bonding network for proton hopping, but also have a similar structure to the polyether sulfone groups (–SO 2 –NH-), which significantly improves the compatibility between the nanofibers and SPSF. Additionally, the flower-like pleated surface of the nanofibers has a high contact area with the SPSF, providing more proton hopping sites, improving the utilization efficiency of proton carriers, and also resulting in a more stable structure. Moreover, the crosslinked network of nanofibers serves as a barrier to further inhibit methanol permeation. The ZANFs/SPSF exhibits excellent parallel proton conductivity of 348 mS cm −1 at 80 °C and 100% RH, which is 2.7 times higher than that of SPSF under the same conditions, and achieves a peak power density of 405.7 mW cm −2 . This approach presents a unique perspective for the preparation of high-performance PEMs for methanol fuel cells.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Ting Xu,Shuang Wang,Tao Wang,Xin Li,Yanli Chen,Qiong Wu,Lili Yang,Xiaoyan Liu,Maobin Wei,Jian Cao
Coupling Ag NPs and direct Z-scheme heterojunction in Fe 3 O 4 @SiO 2 @ZnO-PDA-Ag photocatalysts (FSZ-PDA-Ag) were constructed via the self-polymerization of dopamine. The effects of the loading amounts of Ag NPs on the structure, morphologies, and properties of the photocatalysts were investigated. Under ultraviolet and visible light irradiation, FSZ-PDA-Ag5 exhibited superior photocatalytic activity for tetracycline degradation. Direct Z-scheme ZnO-PDA heterojunction formed in FSZ-PDA-Ag could promote the transfer efficiency of electrons, and then inhibit the recombination of photo-generated charges. Meanwhile, the appropriate load of Ag NPs acted as another conductive channel to further facilitate the electrons transfer , which could extend the lifetime of the photo-generated charges. Thus, the multiple pathways of electrons transfer resulted in the enhanced photocatalytic activity , the degradation mechanism of FSZ-PDA-Ag5 was explored in detail. Moreover, this photocatalyst possessed superior cycling stability and reusability for the wastewater purification. This study may provide a reference for designing efficient and stable photocatalysts.
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Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 26
·5249-5260
·
IF 4.726
Ke Zeng,Jin Li,Zhaoguo Zhang,Mina Yan,Yunhui Liao,Xuefei Zhang,Chunshun Zhao
Lymphatic metastasis plays an important role in tumour recurrence. The applications of nanoparticles in the treatment of lymphatic metastatic tumours have been limited by targeting inefficiency and nonselective toxicity. Hence, in this report, we have developed lipid-coated ZnO nanoparticles (LZnO NPs) in an attempt to solve these issues. Using the microreactor method, we have fabricated ultrasmall (∼30 nm) core–shell-structured nanoparticles loaded with 6-mercaptopurine (6-MP). In vivo results show that the lipid shell induces a remarkable improvement in lymphotropism and biocompatibility compared to ZnO nanoparticles. Furthermore, the ZnO core exhibits not only pH-responsive behaviour to guarantee effective drug delivery, but also a strong preferential ability to kill cancerous cells, as a consequence of the generation of higher inducible levels of reactive oxygen species in rapidly dividing cells. Furthermore, LZnO NPs enhance the cytotoxicity of 6-MP, resulting from the improved internalization of nanoparticles through endocytosis. These findings indicate that LZnO NPs are a promising candidate for use as lymphatic-targeted drug carriers.
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PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Yang Sun,Fan Yang,Siyuan Sun,Yankun Sun,Hongchen Liu,Chunhui Yu,Junpu An,Xi Li,Yongfeng Li
The preparation of highly active and stable Pd-based catalysts for direct alcohol fuel cells (DAFC) is hampered by inefficient utilization of the active sites, susceptibility to CO poisoning, poor stability, and relatively slow reaction kinetics. Herein, the stability and anti-toxicity of the catalysts (Pd/ZnO/MDC) are tuned by loading Pd nanoparticles on the carbon-coated ZnO support, achieving efficient electrocatalysis for methanol and ethanol oxidation reaction (MOR and EOR). TEM result shows the ZnO is covered by the carbon layer formed outside of MOF-5 derived porous carbon, which can prevent it from dissolving under harsh conditions. The mass activities of the well-tuned catalyst Pd/ZnO/MDC (8 0 0) for MOR and EOR are 931.83 mA/mg and 1838.30 mA/mg, respectively. It is due to the improved electron transport efficiency between the Pd and ZnO, and the enhanced stability by carbon layer outside the ZnO. It is also found that the onset potential and the peak potential of Pd/ZnO/MDC (8 0 0) (−0.813 V, −0.228 V) in CO stripping experiment in MOR are more negative than Pd/MDC (8 0 0) (−0.261 V, −0.215 V). This result indicates that the existence of ZnO helps to provide surface hydroxyl group, which promotes the oxidation of the intermediates. This work indicates provides a feasible idea for DAFC catalyst design and construction.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2016
·
IF 2.525
Xinshan Rong,Fengxian Qiu,Zhongtian Jiang,Jian Rong,Jianming Pan,Tao Zhang,Dongya Yang
In current work, a ternary combined ZnO-Ag 2 O/porous g-C 3 N 4 (ZnO-Ag 2 O/pg-C 3 N 4 ) composite photocatalyst was prepared and used for the degradation of ciprofloxacin (CIP) under visible light irradiation. The structure, surface morphology and chemical composition of as-prepared composite photocatalyst are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and Brunauer–Emmett–Teller (BET) methods. From the DRS and PL optical property test, the result indicated that ZnO-Ag 2 O/pg-C 3 N 4 presented relative narrow band gap and higher separation rate of photoinduced charge carriers in the ternary combined system, which was favorable for the photocatalytic activity enhancement under visible light irradiation. Compared with ZnO , porous g-C 3 N 4 , Ag 2 O and ZnO-Ag 2 O, the prepared ZnO-Ag 2 O/pg-C 3 N 4 presents the highest degradation efficiency (97.4%) within 48 min. The degradation intermediates of CIP were detected by HPLC/MS during photocatalytic degradation. Furthermore, porous g-C 3 N 4 as a visible-light-driven photocatalyst used as supporter in the combined system not only improves the degradation efficiency, but also speeds up the reaction rate.
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RSC Advances
·
2012
·Vol. 3
·期 9
·2910-2916
·
IF 0
Shibu Zhu,Liming Shan,Xiangnan Chen,Lan He,Jingjing Chen,Man Jiang,Xiaoli Xie,Zuowan Zhou
ZnO nanorod–nanosheet (NR–NS) hierarchical architectures grown on fluorine-doped tin oxide (FTO) coated glass substrates were prepared via a two-step solution route, which involved the growth of the ZnO nanorods on the FTO substrate, followed by a secondary growth of the ZnO nanosheet on the as-grown backbone. The characterization showed that the nanosheets composed of very small nanoparticles underwent oriented attachment by closely covering the nanorods, resulting in an enhancement of the internal surface area. The ZnO nanostructure films were applied to dye-sensitized solar cells (DSSCs). The photovoltaic results demonstrated that the short circuit current density and the energy conversion efficiency of the NR–NS hierarchical architecture DSSCs were 4.806 mA cm−2 and 1.13%, respectively, which was almost two times higher than those of nanorod only arrays. The dye desorption result and diffused reflectance spectra indicated that the dye absorption amount and light scattering within the NR–NS hierarchical architecture photoanode were higher than those for the nanorod photoanode. The significant improvement was a consequence of the enhancement of dye loading and light scattering within the NR–NS hierarchical architecture photoanode.
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Nanoscale
·
2012
·Vol. 4
·期 24
·7817-7824
·
IF 5.914
Yang Wang,Shouchuan Li,Hui Shi,Ke Yu
Two kinds of Cu2O–ZnO nano-heteroarchitectures were fabricated through a hydrothermal method. By utilizing polyethyleneimine (PEI) as a binding agent, ZnO nanoparticles were uniformly self-assembled onto Cu2O micro structures. Photoluminescence (PL), field emission and photocatalytic activities of the composite samples were investigated and compared with those of the pure Cu2O samples. The results reveal that ZnO nanoparticles combined on Cu2O microstructures remarkably changed the PL signals, and significantly enhanced the field emission and photocatalytic activities. The novel PL properties, enhanced field emission and photocatalysis activities are attributed to the electron transition and the inhibition of photo-induced electron–hole pairs recombination, which stem from interfacial defect states and energy band differentials at the interface of Cu2O and ZnO. The surface nano-protrusions, large surface area and better dye adsorption induced by ZnO nanoparticles are responsible for the field emission and photocatalysis improvements as well.
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高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Yawen Chen,Zhanhao Hu,Zhiming Zhong,Wen Shi,Junbiao Peng,Jian Wang,Yong Cao
Ultrathin ZnO layer of ca. four nm thick deposited from an aqueous zinc oxide hydrate (ZnO·xH2O) solution is developed as the electron transport layer (ETL) in the inverted polymer solar cells (PSCs). Because of the low energy metal–ammine dissociation and hydroxide condensation/dehydration chemistry, a conversion temperature (TA) as low as 80 °C is achieved. With the active layer of poly(N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-3′,2′,1′-benzothiadiazole)) doped with [6,6]-phenyl C71 butyric acid methyl ester (PCDTBT:PC71BM), the average power conversion efficiency of the devices is up to 6.48%, and the short circuit current density reaches 11.4 mA cm–2. In comparison, the devices with traditional sol–gel processed ZnO electron transport layer has a power conversion efficiency of 5.53% at an annealing temperature of 200 °C. The device performance improvement is attributed to the better charge transportation and smoother surface of the ZnO film deposited from ZnO·xH2O aqueous solution. The simple solution preparation and the facile device fabrication, combined with the low conversion temperature make the aqueous ZnO·xH2O one of the best candidates for ETL in the inverted PSCs fabricated on low cost, flexible substrates.
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