Polymers
·
2023
·Vol. 15
·期 22
·4363
·
IF 5
Bai Han,Jinghui Dai,Wanliang Zhao,Wei Song,Zhi Sun,Xuan Wang
Nanocomposite doping is an effective method to improve the dielectric properties of polyethylene. Meanwhile, the introduction of thermal conductivity groups in crosslinked polyethylene (XLPE) is also an effective way to improve the thermal conductivity. Nano-zeolite is an inorganic material with a porous structure that can be doped into polyethylene to improve the insulation performance. In this paper, hyperbranched polyarylamide (HBP) with a high thermal conductivity and an auxiliary crosslinking agent (TAIC) was grafted on the surface of ZSM-5 nano-zeolite successively to obtain functionalized nano-zeolite (TAICS-ZSM-5-HBP) (the “S” in TAICS means plural). The prepared functionalized nano-zeolite was doped in polyethylene and grafted under a thermal crosslinking reaction to prepare nanocomposites (XLPE/TAICS-ZSM-5-HBP). The structural characterization showed that the nanocomposite was successfully prepared and that the nanoparticles were uniformly dispersed in the polyethylene matrix. The space charge of the TAICS-ZSM-5-HBP 5wt% nanocomposite under a high electric field was obviously inhibited. The space charge short-circuit test showed that the porous structure of the nano-zeolite introduced more deep traps, which made the trapped charge difficult to break off, hindering the charge injection. The introduction of TAICS-ZSM-5-HBP particles can greatly improve the thermal conductivity of nanocomposites. The thermal conductivity of the XLPE/5wt% and XLPE/7wt% TAICS-ZSM-5-HBP nanocomposites increased by 42.21% and 69.59% compared to that of XLPE at 20 °C, and by 34.27% and 62.83% at 80 °C.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Liming He,Liming He,Hongda Xu,Xiaolong Wang,Quan Jin
Microwave absorption (MA) has become an important challenge with the development of electronic technology where fine structural design and interface modification of absorbing materials play a crucial role in optimizing their MA performance. In this study, hydrogenated hollow multi-shelled structure (HoMS) TiO 2 (HH-T) was prepared using the sequential template method combined with hydrogenation treatment, followed by the synthesis of HH-T/PPy composite by in-situ polymerization. The HH-T/PPy composite possesses a uniform disordered interface and a uniform 3D conductive network. The HH-T/PPy composite exhibits an improved minimum reflection loss (RL) of −40.2 dB, and an effective absorption bandwidth (RL < -10 dB) of 5.02 GHz with a relatively thin matching thickness of 2.0 mm. The enhanced MA performance is mainly due to the excellent impedance characteristics, interface polarization, and conductive loss. This research offers new insights into the design and analysis of advanced microwave materials with superior performance.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Yanze Bi,Yang Zheng,Yan Li
Porous Mg has been prepared by powder metallurgy using spherical polymethyl methacrylate (PMMA) as the space holder. The PMMA is thoroughly decomposed and removed from the porous Mg after being sintered at 400 °C and then 550 °C. Small amount of MgO forms by the effects of decomposition products. The sintered density of porous Mg decreases from 1.72 to 1.05 g cm −3 with increasing content of PMMA from 0% to 30%. The porosity of the porous Mg increases up to 40% with increasing content of PMMA. The ultimate compressive strength ranges between 25 and 170 MPa and decreases with increasing porosity.
研究领域:
材料科学
·
冶金学
·
机械工程
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 31
·12304-12310
·
IF 0
Dahu baiyila,Xiaohui Wang,Xin Li,Bao sharileaodu,Xiaotian Li,Liang Xu,Zongrui Liu,Limei Duan,Jinghai Liu
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
研究领域:
材料科学
·
环境科学
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PLoS One
·
2014
·Vol. 9
·期 12
·e114300
·
IF 3.534
Xingchu Gong,Ying Zhang,Jianyang Pan,Haibin Qu
A solvent recycling reflux extraction process for Panax notoginseng was optimized using a design space approach to improve the batch-to-batch consistency of the extract. Saponin yields, total saponin purity, and pigment yield were defined as the process critical quality attributes (CQAs). Ethanol content, extraction time, and the ratio of the recycling ethanol flow rate and initial solvent volume in the extraction tank (RES) were identified as the critical process parameters (CPPs) via quantitative risk assessment. Box-Behnken design experiments were performed. Quadratic models between CPPs and process CQAs were developed, with determination coefficients higher than 0.88. As the ethanol concentration decreases, saponin yields first increase and then decrease. A longer extraction time leads to higher yields of the ginsenosides Rb 1 and Rd. The total saponin purity increases as the ethanol concentration increases. The pigment yield increases as the ethanol concentration decreases or extraction time increases. The design space was calculated using a Monte-Carlo simulation method with an acceptable probability of 0.90. Normal operation ranges to attain process CQA criteria with a probability of more than 0.914 are recommended as follows: ethanol content of 79–82%, extraction time of 6.1–7.1 h, and RES of 0.039–0.040 min −1 . Most of the results of the verification experiments agreed well with the predictions. The verification experiment results showed that the selection of proper operating ethanol content, extraction time, and RES within the design space can ensure that the CQA criteria are met.
研究领域:
植物化学
·
药学
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Advanced Science
·
2023
·Vol. 10
·期 19
·2206062
·
IF 15.1
Weikang Zhu,Yabiao Pei,Haotian Liu,Runfei Yue,Shilin Ling,Junfeng Zhang,Xin Liu,Yan Yin,Michael D. Guiver
A Co-based zeolitic imidazolate framework (ZIF-67) derived catalyst with ultrafine CoPt nanoalloy particles is designed via a two-step space confinement method, to achieve a robust oxygen reduction reaction (ORR) performance for proton exchange membrane fuel cell (PEMFC). The core–shell structure of ZIF-67 (core) and SiO 2 (shell) is carefully adjusted to inhibit the agglomeration of Co nanoparticles. In the subsequent adsorption−annealing process, the in situ formed graphene shell on the surface of Co nanoparticles further protects metal particles from coalescence, leading to the ultrafine CoPt nanoalloy (average diameter is 2.61 nm). Benefitting from the high utilization of Pt metal, the mass activity of CoPt nanoalloy catalyst reaches 681.8 mA mg Pt −1 at 0.9 V versus RHE according to the rotating disk electrode test in 0.1 m HClO 4 solution. The CoPt nanoalloy-based PEMFC provides a high maximum power density of 2.22 W cm −2 (H 2 /O 2 ) and 0.923 W cm −2 (H 2 /air). Simultaneously, it shows good stability in the long-time dynamic test at low humidity, due to the robust CoPt@graphene core–shell nanostructure. This work provides a viable strategy for designing Pt-based nanoalloy catalysts with ultrafine metal particles and high stability.
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DESALINATION
·
2023
·
IF 9.9
Yiyun Cao,Lvji Yan,Haiyin Gang,Bichao Wu,Dun Wei,Peng Chen,Tingzheng Zhang,Haiying Wang
Exploring and designing high performance pseudocapacitance electrode materials is of great significance in enhancing the desalination performance of capacitive deionization (CDI). Transition metal cobalt is considered a prospective electrode material for CDI because of its abundance and high theoretical capacity, which can produce a higher salt removal capacity than pure capacitive materials in the CDI process. However, due to the collapse and loss of the active electrode crystal matrix, the cobalt electrode exhibits poor electrochemical performance. In this work, we used a second metal element, Fe, introduced by ion exchange pyrolysis to regulate the leaching effect and optimize the ion matching for cobalt to protect the electrode structure . In addition, the interconnected external carbon layers form a robust matrix for enhanced electrical conductivity with ion transport. Thanks to the synergistic effect of the cobalt‑iron (Co 3 Fe 7 @C) electrode structure and surface engineering, the adsorption capacity reached 72.29 mg·g −1 , achieving 110 % capacity retention in 100 cycles of chlorine removal. As a result, the carbon-coated cobalt‑iron bimetallic electrode exhibits excellent dechlorination capabilities in capacity, cycle life and rate capability. This study provides a promising avenue for the design of stable electrode materials for capacitive deionization electrodes.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Sizhao Zhang,Guangyu Xu,Kunming Lu,Jing Wang,Hui Ji,Zhao Wang,Zhouyuan Yang,Yue Yang,Yunyun Xiao,Feng Ding
Polybenzoxazine aerogel is a new polymer aerogel material developed in recent years, which the ring-opening polymerization of benzoxazine monomer under high temperature or HCl could achieve the formation of cross-linked three-dimensional network structure so that to further reduce the cost of preparation. However, HCl as a catalyst has the disadvantages of easy volatilization and corrosion. Here we introduced Lewis acid as the catalyst for fabricating nanoporous polybenzoxazine aerogels with low density and self-extinguishing properties depending upon the evolution law for the influence of the mixed ratio of Lewis acid and hydrochloric acid (volume ratio) on the corresponding aerogels. The results show that PBz aerogels prepared in the mixed acid environment (with n -hexane as the exchange solvent) have a good three-dimensional nanopore network structure, and the pore size distribution is in the range of 20–140 nm. Additionally, the obvious self-extinguishing performance (even exposing to a flame at 1200 °C), low density and excellent mechanical properties are reflected as well, potentially suggesting the broad application prospects in the field of aerospace.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Wenhao Wu,Yuan Lan,Yaxiong Zeng,Daohui Lin,Kun Yang
Organobentonites, i.e., bentonites coated with surfactants such as cetyltrimethylammonium (CTAB), are superior and low-cost sorbents for removal of organic contaminants from wastewater. Nonlinear sorption of polar organic compounds such as phenols and anilines by organobentonites were widely observed and interpreted by adsorption mechanism. However, in this study, it was observed that the nonlinear sorption of phenols and anilines by CTAB coated bentonites (CTAB-bentonites) should be attributed to nonlinear partition mechanism with the additional space limitation in CTAB-bentonites for nonlinear partitioning, rather than adsorption mechanism. This nonlinear partition mechanism is supported by that (i) organobentonites is a partition medium, identified by the linear isotherms of polycyclic aromatic hydrocarbons (PAHs) and nitrobenzenes ; (ii) sorption coefficients (log K d ), the ratio of adsorbed amount ( q e ) to equilibrium concentration ( C e ), and Dubinin-Ashtakhov (DA) model fitted sorption capacity (log Q 0 ) of organic compounds, by a given CTAB-bentonite, are positively correlated with their octanol-water distribution coefficients (log K OW ) and solubility in octanol (log S o ) respectively; (iii) log K d and log Q 0 of a given organic compound by CTAB-bentonites are positively correlated with organic carbon contents ( f oc ) of CTAB-bentonites, but not specific surface area. Specific interaction (i.e., hydrogen-bonding interaction), in addition to van der Waals force , is responsible for the nonlinear partitioning of phenols and anilines into CTAB-bentonites, because of the positively linear relationship between DA model fitted sorption affinity ( E ) and hydrogen-bonding donor parameter ( α m ) of organic compounds. These results could help the recognizing of the nonlinear sorption behaviors of organic compounds by organobentonites and promote their environmental applications in wastewater treatment .
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Advanced Materials Technologies
·
2025
·
IF 6.2
Shixiang Lin,Chengfeng Sun,Yuhan Huang,Bin Cheng,Heng Luo,Minglu Zhu,Tao Chen,Fengxia Wang,Lining Sun
Gesture recognition based on machine-learning approaches plays a pivotal role in advancing Human–machine Interaction (HMI) and robotics. Typical smart glove solutions with flexible sensors can only recognize discrete gestures, not sentences, and fail to meet the daily communication needs of signers. Moreover, current interfaces for displaying recognition outcomes are mostly confined to smartphones or computers, limiting seamless communication between signers and non-signers. Herein, we propose an artificial intelligence hand gesture recognition HMI system consisting of an intelligent sensing glove, a machine learning module, and a virtual reality interface. This system represents a substantial leap forward in gesture recognition technology with adaptability, comfort, and lightweight construction. Enhanced by advanced machine learning algorithms, it achieves remarkable accuracy across a diverse range of gestures—including 10 numeric gestures, 14 alphabetic phrases, and 5 sentence patterns—boasting 99.5% accuracy for numeric and 99.3% accuracy for alphabetic recognition and an impressive 98.8% accuracy for sentence-level interpretation. The system projects recognition results into a virtual space, translating gestures into text in real time. This functionality facilitates not only human–machine interaction but also inter-human communication, particularly bridging the gap between signers and non-signers. It underscores its potential for practical implementation in next-generation HMI systems.
研究领域:
人机交互
·
人工智能
·
可穿戴电子
·
机器人学
·
虚拟现实技术
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 43
·1804394
·
IF 13.325
Junpeng Zeng,Xiaoming Li,Ye Wu,Dandan Yang,Zhiguo Sun,Zehao Song,Hao Wang,Haibo Zeng
All-inorganic halide perovskite is considered as outstanding candidate of organic–inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space-confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr 3 polycrystalline films realize low trap density (3.07 × 10 12 cm −3 ) and high carrier mobility (9.27 cm 2 V −1 s −1 ) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W −1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr 3 based PDs. A record detectivity of 7.55 × 10 13 and 3.1 × 10 5 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all-inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.
研究领域:
材料科学
·
光电技术
·
纳米技术
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 13
·7093-7099
·
IF 7.443
Jiaoxing Xu,Qiangmin Yu,Lunhui Guan
Hierarchically nanoporous N-doped carbon nanowires (N-CWs) were prepared by a novel space-confinement-induced assembly strategy, for which nitrogen-enriched pyrimidine and anodic aluminium oxide (AAO) template bearing metal oxides are employed as precursor and nanoscale channels, respectively, and the Fe/Co metal oxide not only blocks the AAO surface from the original surface-templating carbonization, but also introduces nanoporosity with acid etching. Thus-obtained carbon nanowires composed of N-doped graphene-like carbon nanosheets not only contain a high N content (up to ∼12%), but also possess a hierarchically meso/microporous structure (∼1.3 cm3 g−1) with high specific surface area (∼455 m2 g−1). This protocol allows for the simultaneous optimization of graphitization, porous structure and surface functionalization. As a result, the prepared N-CWs demonstrate an attractive electrocatalytic capability towards oxygen reduction reaction (ORR). Specifically, in addition to the improved kinetic current density and overpotential, the N-CWs prepared at 700 °C show the optimized ORR performance with an electron-transfer number of ∼4.0, which very close to that of a commercial Pt/C catalyst.
研究领域:
材料科学
·
电化学
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