CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Siyu Chen,Ying Li,Donghong Wang,Zhiyong Chen,Yi Zuo,Sifan Zong,Jimei Xue,Zhijun Wang,Hanjun Wei
Due to the poor electromagnetic (EM) wave attenuation capability and relatively large bandgap of rare-earth silicate materials, their application as EM wave attenuation materials is adversely affected. In this work, TiO 2 was deposited onto the surface of porous Yb 2 Si 2 O 7 using a precipitation process followed by calcination. A transition from TiO 2 nanorods to nanowires resulted in a flower-like three-dimensional (3D) network structure, effectively modulating the dielectric and EM wave-absorbing properties. The TiO 2 /Yb 2 Si 2 O 7 ceramic (YT-3 sample) with a TiO 2 nanowire content of 20.1 wt% achieved a minimum reflection loss (RL min ) of −21.1 dB at 2.3 mm and an effective absorption bandwidth (EAB) of 2.6 GHz at a thickness of 2.5 mm. Furthermore, the EAB fully covered the X-band at thickness ranging from 2.0 to 4.10 mm. The radar cross-section of the YT-3 sample significantly decreased by 21.5 dBm 2 . This improvement likely attributed to the 3D porous structure formed by the TiO 2 nanowires, which improved the impedance matching and electrical conductivity while increasing both homogeneous interfaces and heterointerfaces. This enhancement facilitated electron transfer and hopping, amplified polarization and conduction losses and promoted multiple EM wave reflections and scattering. Additionally, the weight variation of the YT-3 sample was <0.48 % in the range of 25–1400 °C, demonstrating excellent high-temperature stability. These results advances to the development of Yb 2 Si 2 O 7 -based wave-absorbing materials for achieving effective EM wave absorption in high-temperature environments.
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JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 25
·期 2
·373-382
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IF 1.624
Wang Liang,Li Zhu,Jing Qiangshan,Liu Peng
The aim of this paper is to synthesis a new type of insulation material (EPA), which fill the aerogels into the expanded perlite (EP). EP is a kind of lightweight filler, its application is constrained by the character of absorbing water easily. The silicic acid is inhaled into the expanded perlite at −0.1 MPa, aging 24 h, it becomes aerogel after solvent exchanging/surface modifying and drying. The pores of EP are filled with aerogel which affects thermal conductivity of expanded perlite little and makes it hydrophobic. EPA has a wider use than EP for its hydrophobic character. A new recipe to synthesize aerogel, filled into EP, with the thermal conductivity of 0.034 W/m K in ambient pressure drying is found in this experiment. The time and reagents dosage for synthesizing EPA are less than large block of aerogel, while the thermal conductivity is close to it. The scanning electron microscopy is used to analyze EPA’s micro structure. The thermal conductivity tester is used for testing the thermal conductivity of silica aerogel, expanded perlite and EPA.
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ACS Nano
·
2024
·
IF 15.8
Jin Zhao,Zehua Chen,Zhihui Chen,Zeyi Meng,Jianwei Zhang,Wenjie Lv,Congshan Guo,Zhizhen Lv,Shouce Huang,Yang Yang,Zhongfan Liu,Jingshu Hui
An accurate assessment of the electrodeposition mechanism is essential for evaluating the electrochemical stability and reversibility of the metal anodes. Multiple strategies aimed at uniform Zn deposition have been extensively reported, yet it is challenging to clarify the Zn crystal growth regularity and activity due to the obscured physicochemical properties of as-deposited Zn. Herein, we present a protocol for elucidating the controlled epitaxial growth process of Zn crystals and quantifying their surface electrochemical activity using scanning electrochemical microscopy. We find that the early-stage epitaxy tends to form a stacked-multilayer structure accompanied by intermittent rotation. The site-dependent kinetics and morphology correlation reveal a distinct evolution path at early and final stages. Our exploration advances the understanding of the Zn growth mechanism and facilitates the realization of the interface kinetics of metal batteries in situ.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenjie Zhang,Chenhao Wang,Jingzhang Wang,Wei Wei,Zhengyu Wang,Xian Li,Anne Ailina Li,Lianqun Zhou,Qing Wang,Hui Kong
Beta-amyloid 42 (Aβ-42) peptide is an essential biomarker for Alzheimer's disease (AD) diagnosis. This study presents high sensitivity and stability sensors for Aβ-42 peptide detection, along with an integrated handheld analysis and display device. The sensors, with a wide response range and high accuracy, capable of measuring Aβ-42 peptide concentration at the femtogram level, could have enabled early screening for AD. Employing an in-situ grown three-dimensional sensor, the specific surface area of the sensor was increased by 200 % which, thereby, provided more antibody binding sites to enhance detection accuracy. This electrochemical sensor demonstrated a broad linear response range from 4.5 × 10 −8 pg/mL to 4.5 × 10 2 pg/mL and could accurately determine the concentration of spiked analytes (including artificial saliva, human plasma, and human blood). Furthermore, the sensor exhibited satisfactory stability, with only a 5 % sensitivity loss after 35 days of storage at 4 °C. Additionally, this handheld Aβ-42 peptide testing device incorporates a display for result delivery. Such innovative technology could fill the gap in the market for portable testing instruments and could provide an efficient and reliable solution for early AD screening.
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IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2024
·Vol. 71
·期 12
·7536-7542
·
IF 2.9
Gaoliang Zhou,Gang He,Jiawei Yang,Wentao Su,Can Fu,Huanhuan Wei,Bo He
The development of high-performance thin-film-transistors (TFTs) is of paramount importance for human-computer interaction and neuromorphic computing. Therefore, this work presents an arrayed nanofibers (NFs) heterojunction (InSnO/ZnO) synaptic transistor; the introduction of array heterojunction (AH) architectures significantly enhances the overall performance of NF transistors. The arrayed heterojunction NFs synaptic transistor demonstrates excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and the transitions from short-term to long-term potentiation (STP-LTP). These features suggest potential applications in neuromorphic computing, including constructing artificial neural network (ANN) models for image recognition. Additionally, to study memory behavior in multisensory integration, an artificial audio-visual integration device was developed, successfully mimicking bionic behaviors such as the cocktail party effect and its memory aspects in various environments. These results indicate that the as-prepared synaptic transistor has promising applications in future circuit designs and artificial intelligence chips.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Rongcai Jia,Liang Guo,Wei Yang,Dezhao Wang,Zhengzhe Li
Hydrogen sulfide (H 2 S) is a highly toxic gas commonly encountered in industrial settings, posing substantial health risks to workers. Therefore, the development of sensors with optimized operating temperatures, rapid detection speeds, and broad measurement ranges is of paramount engineering significance. In this study, ZnFe 2 O 4 /MoO 2 nanocomposites were synthesized using a hydrothermal method, and, for the first time, MEMS-based gas sensors utilizing ZnFe 2 O 4 /MoO 2 nanocomposite films were employed for hydrogen sulfide detection. The structural composition and morphology of the ZnFe 2 O 4 /MoO 2 (2:1) samples were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The gas sensitivity of ZnFe 2 O 4 /MoO 2 toward H₂S was systematically investigated. Gas sensitivity tests demonstrated that the ZnFe 2 O 4 /MoO 2 composite sensor exhibited a response value of 19.177 at 5 ppm hydrogen sulfide, which is 5.2 times greater than that of ZnFe 2 O 4 , the current dominant material for H₂S detection. Furthermore, the ZnFe 2 O 4 /MoO 2 composite sensor demonstrated a detection limit as low as 1 ppm and exhibited significantly faster response and recovery times (13 s and 11 s, respectively, for 5 ppm H₂S). The ZnFe 2 O 4 /MoO 2 (2:1) nanocomposite sensor exhibited excellent stability, sensitivity, and remarkable selectivity. This enhanced gas-sensing performance is attributed to the formation of n-n heterojunctions between ZnFe 2 O 4 and MoO 2 , as well as the optimized nanomorphology of the composite. Therefore, the ZnFe 2 O 4 /MoO 2 sensor presents a promising solution for hydrogen sulfide detection in industrial applications.
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RENEWABLE ENERGY
·
2024
·
IF 9
Hamir Johan Mombeki Pea,Zhoujian An,Xiaoze Du,Wenjie Hou,Dong Zhang,Xiaomin Liu
Expanded graphite (EG) is often used to encase phase change materials (PCMs) and improve their thermal performance. However, EG's effectiveness when used with disodium hydrogen phosphate dodecahydrate (DHPD) as a hydrated salt is diminished, due to its hydrophobic property. This study proposes modifying the hydrophobic surface of EG with highly hydrophilic nanoparticles, such as SiO 2 and TiO 2 , to address this shortcoming and boost its hydrophilicity. Herein, the nanoparticles were synthesized by the sol-gel technique and mixed with EG to construct a modified EG (MEG). The microstructure, morphology, and adsorption ability of MEG were analyzed. Additionally, the thermal properties, as well as the thermal stability of form-stable composite PCMs, were investigated. The results revealed that by varying the mass ratio of SiO 2 @TiO 2 in MEG, the supercooling degree of the form-stable composite PCMs decreased by 77.36%–78.49%. With 9% SiO 2 @TiO 2 in MEG, the water contact angle of MEG was optimal, and the form-stable composite PCMs prepared (DSMEG3) exhibited a phase change temperature and latent heat of 32.88 °C and 142.13 J/g, respectively. This experimental latent heat was slightly lower than the calculated latent heat by 0.12 J/g. Meanwhile, the supercooling degree decreased to 3.01 °C, and the thermal conductivity increased to 1.23 W/(m ∙ K), which was 1.73 times than that of DHPD. Moreover, DSMEG3 also showed good shape stability, preventing leakage. Therefore, the form-stable composite PCMs, as prepared, are a great potential candidate for the energy storage applications .
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yanfei Wang,Tongge Li,Shihui Wang,Xiao Du,Lin Li,Hui Xiao,Zhaoyuan Zhang,Feiyang Jiang,Shifa Li,Zhenzhong Wang,Yifang Wang,Ning Yang
The excessive emission of industrial CO 2 seriously threatens the living environment of human beings. In this paper, we propose a CO 2 sensing method based on cyclic microfluidic and dynamic flow detection technology. Firstly, a microflow permeation model was established to describe the numerical relationship between CO 2 permeation flux and gas phase inlet concentration and velocity. Secondly, we designed a microfluidic chip with coupled gas–liquid circulation and optimized its channel structure. Based on this, a microflow fluorescence response sensing system was built to analyze the fluorescence response spectral characteristics under different CO 2 permeation fluxes. Then, the optimal gas flow rate selection strategy for different CO 2 concentrations was proposed, and the CO 2 dynamic sensing model was established. Finally, the reliability of the proposed detection method is verified by comparing the detection results of commercial sensors with standard gases. The results indicate that the linear correlation coefficient between the relative fluorescence intensity and CO 2 concentration of the proposed CO 2 dynamic sensing method is 0.9987, the detection error of low concentration range is 193.3 ppb, and the detection error of high concentration range is less than 193.3 ppm. Compared with the parallel flow mixing device, the gas–liquid circulation-coupled microfluidic chip designed in this paper has better gas–liquid mixing effect. The system can operate continuously in the air for 40 weeks. Compared with commercial sensors, it has the advantages of better reusability, high linearity and low detection error in the whole range.
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高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 21
·e202401644
·
IF 1.9
Qi Shi,Pan Cao,Siqi Huang,Zhixin Ren,Yuguang Lv,Tai Peng
Graphical Eu/g-C 3 N 4 composites were prepared and the optimum elemental doping ratio was proved experimentally. The good photocatalytic activity of the composites was determined by the degradation rate of antibiotic drugs under visible light irradiation and explore its photocatalytic mechanism. Graphene-like materials were prepared by thermal copolymerization using melamine as a precursor, and chemical methods successfully synthesized Eu/g-C 3 N 4 composites containing different europium elements. Degradation rates of 64.3 %, 91.9 %, and 72.8 % were observed in the photocatalytic degradation of Pefloxacin, Enrofloxacin, and Ciprofloxacin under visible light (λ>550 nm). Determine the photocatalytic activity of the composite. When the doping amount was Eu/g-C 3 N 4 -2 with k=0.0135 min −1 , four times greater than that of g-C 3 N 4 , the best photocatalytic effect was obtained. Repeated studies revealed that the Eu/g-C 3 N 4 composite samples had good cycle stability, and a potential degradation process was postulated.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Guoxin Zhu,Xiong Zhang,Yan He
Superhydrophilic-superoleophobic materials possess unique advantages in oil-water separation due to their water permeability and oil repellency. In this study, superhydrophilic-superoleophobic sand (CQS) was prepared using a facile and rapid mixing-drying coating method. Quartz sand was modified with polydopamine (PDA) as the hydrophilic binding agent, fluorosurfactant (FS-50) as the oleophobic agent, and CaCO 3 /SiO 2 to construct hierarchical surface roughness. The CQS exhibited a water contact angle of 0° and an oil contact angle of 154°, which resulted in a slightly increased water adhesion capacity and a significantly reduced oil adhesion capacity. Owing to its selective wettability towards oil and water, the CQS was capable of directly separating immiscible oil-water mixtures and oil-in-water emulsions with high separation efficiency (99.5 % and 98.5 %, respectively), driven by gravity. Moreover, immiscible oil/oil mixtures could be effectively separated by the CQS as well, expanding its application to separating immiscible organic liquids with different polarities. Additionally, the CQS demonstrated good reusability and superior stability against acid, alkali, salt, hot water and mechanical abrasion. These properties ensured its applicability in complex environments. The CQS, with exceptional separation capability and stability, holds promising prospects for future applications in related separation field.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Cunmin Wang,Xinjian He,Guiying Zhu,Xiang Li,Xuanjin Zhu,Ruizi Chen,Shangxin Tian,Xinyu Li,Jintuo Zhu,Jiang Shao,Jiefeng Gao,Gan-Ji Zhong,Huan Xu
Biodegradable and renewable poly(lactic acid) (PLA) fibrous membranes have emerged as a promising approach to replace traditional polymeric air filters, but are still challenged by relatively low electroactivity and poor electret properties. Herein, we disclose an effective electrospinning strategy to substantially promote the electroactivity by extreme orientation of stereocomplexed PLA (OSC-PLA), conferring significant alignment and refinement of the electrospun nanofibers (diameter of ∼370 nm), as well as facilitate the formation of electroactive phases (i.e., β-phase, electrospun phase, and stereocomplex crystals). Benefiting from the well-tailored morphology and remarkable electroactivity, the OSC-PLA nanofibrous membranes (NFMs) were characterized by largely improved dielectric properties, surface potential (over 3.64 kV), and PM0.3 filtration properties (93.33% at 85 L/min) compared to the pure PLLA membrane (2.01 kV and 80.21%). It enabled the assembly of triboelectric nanogenerator (TENG) air filters using the OSC-PLA NFMs as the active layer, yielding excellent charge regeneration mechanisms and an output current of nearly 80 nA, as driven by respiratory vibrations at 85 L/min, thus permitting high humidity resistance, as exemplified by a PM0.3 removal efficiency of 95.02% at a RH of 90%. Moreover, deep machine learning and man–machine interaction were integrated with the OSC-PLA-based TENGs, demonstrating long-term monitoring and a high-precision diagnosis (accuracy of 96.88%) of various respiratory patterns. The proposed ecofriendly and electroactive ultrafine PLA nanofibers are highly appealing for sustained respiratory healthcare and self-powered intelligent diagnosis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wansheng Li,Yu Feng,Taisen Yan,Yongqiang Zhang,Xingguo Wei,Qinghang Lv,Jiang Qin
With the increasing power of electronic devices, thermal management has become crucial for their operational efficiency and lifespan. In this work, we have demonstrated a sorption-based thermal management strategy enabled by hygroscopic hydrogel. The polyacrylamide (PAM) hydrogel impregnated with LiCl (PAM-LiCl) was attached to a silicon wafer. And Pt metal circuits were coated to the silicon wafer to measure the temperature variations under different heat flux densities. The results show that the hydrogel can effectively reduce the surface temperature. At a heating power of 0.3 W/cm 2 , the temperature control duration reached 30 min, with an average effective heat transfer coefficient of 65.5 W/(m 2 ·K) and an effective heat storage density of 171 J/cm 2 . Additionally, we developed and validated a multiphysics model considering desorption and vapor diffusion within the hydrogel. Numerical results indicate that during the desorption cooling process, the surface heat transfer resistance and the internal diffusion resistance play a dominant role. Additionally, we analyzed the effects of material properties, structure parameters, and operating conditions on the thermal management performance. This study helps to understand the key points of sorption-based thermal management technology and guide the design and optimization of sorption-based thermal management system.
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高影响因子
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