CARBON
·
2023
·
IF 10.9
Guifang Yang,Baokun Zhu,Yifeng Ying,Haiqing Li
Porous carbons (PCs), widely deployed sorbents in diverse areas, are usually synthesized by thermochemically carbonizing carbonaceous precursors and thermally regenerated at great energy-cost. To seek alternative solutions to such energy penalty and based on the exceptional localized Eddy current heating (LECH) capacity of metal objects upon their exposure to an alternating magnetic field , LECH-driven synthesis of PCs is explored and exemplified by using nickel foam (NF)-delivered LECH to drive carbonization of phenolic resin (PR) infilled within the voids of NF, producing varied PC-incorporated NFs (NF@PCs). Compared with the PCs prepared by using conventional tubular furnace heating, LECH-driven carbonization of PR is able to produce PCs at lower temperature and with greatly enhanced porosity, surface area and graphitization degree, which are mainly resulting from the localized heating nature of LECH. Driven by the same NF-delivered LECH, the moisture adsorbed in the LiCl-loaded NF@PC can be rapidly and completely released at moderate temperature, demonstrating the highly efficient LECH-driven regeneration of PCs. Given that the LECH is delivered by cost-effective and widely available NFs, occurs within the matrix of PR and PC bulk solid, and remotely triggered by an external magnetic field with greatly mitigated energy loss , LECH-driven carbonization of PR and water desorption from PCs thus demonstrated a new, energy-efficient and low-cost strategy to effectively synthesize and regenerate PCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Xu Zijie,Cao Leo N. Y.,Li Chengyu,Luo Yingjin,Su Erming,Wang Weizhe,Tang Wei,Yao Zhaohui,Wang Zhong Lin
Real-time monitoring of flow turbulence is very difficult but extremely important in fluid dynamics, which plays an important role in flight safety and control. Turbulence can cause airflow to detach at the end of the wings, potentially resulting in the aerodynamic stall of aircraft and causing flight accidents. Here, we developed a lightweight and conformable system on the wing surface of aircraft for stall sensing. Quantitative data about airflow turbulence and the degree of boundary layer separation are provided in situ using conjunct signals provided by both triboelectric and piezoelectric effects. Thus, the system can visualize and directly measure the airflow detaching process on the airfoil, and senses the degree of airflow separation during and after a stall for large aircraft and unmanned aerial vehicles.
研究领域:
航空工程
·
流体力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 17
·13956-13967
·
IF 2.779
Sun Haibo,Zhou Guohua,Guo Zhili,Wang Ce,Wang Jinghui,Zong Changbao
The high-quality TiO 2 insulating layer on the commercial gas-atomized FeSiAl powder surface was efficiently prepared within a total time of 1 h at room temperature via a one-pot sol–gel method based on a developed industry-oriented coating equipment. The core-shell structure for the chemically coated FeSiAl powders was detected by the joint tools of SEM, EDS, and FTIR. Combined with the establishment of loss separation fitting model, the regulation mechanism analysis on soft magnetic properties was carried out for the FeSiAl powder cores insulated with different TiO 2 coating amounts. It is found that the interface-pinning effect, which is closely related to the core’s density, is an important factor affecting the magnetic properties of powder cores. With the elevating TiO 2 coating amount, the hysteresis loss, the excess loss, and DC-bias property of the core specimen exhibit the same increasing tendency, while the real part of complex permeability at 100 kHz gradually decreases owing to the increase of non-magnetic gap between the particles in the core, which can impede the domain-wall motion during magnetization. Correspondingly, the eddy current loss persistently decreases and contributes only 18.7% ~ 21.6% of total core loss when the precursor concentration is over 0.08 ml/g due to the formation of the intergranular insulated structure blocking the inter-particle eddy current flows in the composites. These results offer insights into subtly regulating magnetic properties when the adjusting process parameters for the soft magnetic composites are used in high-power and high-frequency applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Qiangqiang Li,Qiannan Wu,Yingle Tao,Haiqing Li
On the basis of stainless-steel fiber (SSF)-delivered localized Eddy current heating (LECH) in response to an alternating magnetic field, a novel LECH-driven framework synthesis (LIFS) strategy has been developed for highly efficient metal–organic framework (MOF) synthesis, resulting in the production of a set of SSF/MOF composites consisting of MOF-coated SSF (SSF@MOF) fibers and free MOF crystals. Detailed studies on the LIFS reaction kinetics indicate that the use of LIFS can greatly promote MOF production in comparison to the conventional solvothermal reactions. To facilitate the practical applications, the resulting powder SSF/UiO-66-NH2 composites, as a typical example, are further processed into well-shaped SSF/UiO-66-NH2 monoliths (SUS) with varied MOF loadings. In SUSs, the embedded SSFs exhibit well-controlled LECH capacities depending on the applied magnetic field strength. Driven by LECH, SUS monoliths can be uniformly heated and fully regenerated, demonstrating a LECH-triggered framework regeneration (LIFR) process for highly efficient regenerating MOF monoliths. As LECH is delivered by the low-cost commercial SSFs and remotely triggered by an external magnetic field, our currently developed LIFS and LIFR processes provide a novel, low-cost, and energy-efficient way to highly efficiently synthesize and regenerate MOF materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Danhua Liu,Xin Liu,Jian Wang,Xinhua Mao,Xiaochang Xu,Xi’an Fan
The effect of Fe nanoparticles with mass fraction of 0-7 wt% on the microstructure and soft magnetic properties of the Fe-6.5 wt%Si soft magnetic composites (SMCs) was investigated. The results show that the pores between Fe-6.5 wt%Si powders can be effectively filled by Fe nanoparticles , thereby correspondingly increasing the density of the SMCs. At the same time, the magnetic permeability of the SMCs mixed with different mass fraction of Fe nanoparticles has improved significantly and exhibits good frequency stability compared with the absence of Fe nanoparticles. It also reveals that the addition of 1 wt% Fe nanoparticles can reduce the eddy current loss of the SMCs by decreasing its intra-particle eddy current loss. When the addition of Fe nanoparticles is 3 wt%, the SMCs exhibits good magnetic properties with high magnetic permeability (increased by 24%) and relatively low core loss.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 10
·2305
·
IF 3.426
Dan Tian,Ji-Huan He
Mechanical property is one of the most important properties of nanofiber membranes. Electrospinning is widely used in the preparation of nanofibers due to its advantages such as good stability and easy operation. Compared with some nature silk, the mechanical properties of nanofibers prepared by electrospinning are poor. Based on the principle of vortex spinning and DNA structure, this paper designed an air vortex electrospinning device that can control the structure of macromolecular chains in nanofibers. When a weak air vortex is generated in the electrospinning process, the macromolecule chains will entangle with each other and form a DNA-like structure so as to improve the mechanical property. In addition, when a strong air vortex is generated during the electrospinning process, the nanofibers will adhere to each other, thereby enhancing the mechanical property and enlarging the pore size.
研究领域:
材料科学
·
生物工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Li,Weichao Yang,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
FeSiAl soft magnetic composites (SMCs) with phosphate-silicone resin as the insulating layer were prepared by phosphating FeSiAl powder with K 3 PO 4 solution. The effects of K 3 PO 4 content on the microstructure and composition of the insulation coating were investigated. Further, the soft magnetic properties of SMCs were analyzed in detail. It is revealed that the annealed inorganic coating layer which predominantly consists of Al(PO 3 ) 3 , Al 2 O 3 , and P 2 O 5 exhibits a high resistivity, high temperature resistance and thin thickness, significantly reducing the eddy current loss. The outstanding magnetic properties of a power loss of 118.6 kW/m 3 (100 kHz, 0.1 T) and permeability of 63.8 were achieved for this high-quality thin insulation coating. Moreover, the magnetic loss was separated into hysteresis, eddy current and excess part, and the mechanism was analyzed in detail. The reduced total loss can be ascribed to the suppression of the eddy current. The novel SMCs coating with K 3 PO 4 are particularly suitable for applications in high frequency and high DC bias situations for switching power supplies, photovoltaic inverter boost inductors and other applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yunxiao Ban,Jingang Wang,Cong Ma
In response to the contamination of water bodies by heavy metal pollution, particularly chromium (VI), this paper proposes a novel diverging microporous curved surface micro-vortex flocculation magnetic stable bed reactor for the treatment and purification of Cr(VI). The results show that under conditions of adding 0.0996 ∼ 1.373 mg/L FeSO 4 , 70 mg/L polyaluminum chloride (PAC), and 1.5 mg/L polyacrylamide (NPAM) respectively, and with an inlet flow rate of 0.023–2.101 m3/h for the reactor’s opposed-flow water distribution with different elevations, the removal rates of Cr(VI) and turbidity reach over 97 % and 99 %, respectively. By analyzing the instantaneous velocity vectors, streamlines, and vorticity distributions within the reactor using Particle Image Velocimetry (PIV) instruments, it is found that various turbulent flow patterns such as swirling flow, annular flow pattern, spiral flow, and water tongue flow are formed within the reactor. These flow patterns correspond to the generation of vortexes, micro-vortices, and micro-holes, resulting in a cascade flocculation phenomenon with their respective solid–liquid separation mechanisms. This makes the reactor a promising candidate for the treatment of heavy metal wastewater.
研究领域:
环境科学
·
污水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Su Wang,Jiaxiang Zhang,Kaixuan Ma,Wanyao Zhang,Yan Gao,Pengjie Yu,Shuangfei Zhao,Yirong Feng,Jiming Yang,Ruiyan Sun,Yuguang Li,Ning Zhu,Wei He,Kai Guo
Microreactors excel in nanomaterial preparation but are limited by microchannel clogging for sustained long-term use. This study reports an innovative design of an ultrasound-assisted vortex microreactor for the continuous synthesis of high-performance nano-Fe 3 O 4 particles. Combining visual experiments with computational fluid dynamics (CFD) simulations, four vortex microreactors were designed, and their mixing and heat transfer processes were investigated. Through comprehensive analysis, the microreactor-4 was identified as the optimal configuration, with an optimal flow rate of 1 mL/min and a temperature of 70 °C. By coupling the microreactor with ultrasound, a continuous preparation method for nano-Fe 3 O 4 was realized. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses revealed that the synthesized nano-Fe 3 O 4 particles exhibit a spherical crystal morphology with an average particle size of approximately 6.68 nm, which is 24.4 % and 20.5 % smaller than those prepared by the beaker method and by a stirred-field coupled microreactor reported in the literature, respectively. Vibrating sample magnetometry (VSM) measurements indicated a saturation magnetization of 45.75 emu/g for the nano-Fe 3 O 4 , representing a 32.3 % increase over the beaker method and demonstrating excellent superparamagnetic properties. This study provides a novel and effective pathway for the continuous preparation of nanoscale magnetic materials.
研究领域:
化学工程
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Caijin Zhou,Bingqi Xie,Junxin Chen,Yiwei Fan,Jisong Zhang
The generation of Dean vortices in the membrane contactor is regarded as one of the critical technologies for gas-liquid mass transfer enhancement at low liquid Reynolds number. In this work, the gas-liquid mass transfer enhancement by Dean vortices in the curved hollow fiber membrane contactors is rapidly characterized based on the flux balance of gas across the membrane and dissolved in liquid. The effects of Reynolds number, curved diameter, liquid viscosity and rheology on the gas-liquid mass transfer enhancement with different curved shapes are systematically determined. The gas-liquid mass transfer correlations are proposed to describe the enhancement effect of Dean vortices on gas-liquid system with different viscosities. At the helical diameter of 6 mm and Reynolds number of 308, the enhancement factor is up to around 2.5. Furthermore, the trade-off relation between gas-liquid mass transfer intensification and energy consumption across the curved membrane contactors is investigated. The liquid velocity profile is also obtained by the finite element numerical simulation with COMSOL Multiphysics software to evaluate the Dean vortices intensity generated in different curved shapes, which agrees well with the experimental results.
研究领域:
化学工程
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2025
·Vol. 58
·期 13
·135005
·
IF 3.2
Rongdi Guo,Jiaxiang Qin,Guohua Wu,Zhongqiang Hu,Ming Liu
Soft magnetic composites (SMCs) are considered key elements for attaining electromagnetic signal transmission and conversion. However, they require high permeability and low core losses to ensure the efficient and stable operation of electronic devices, such as inductors and sensors. To effectively address these issues, in this work, AlN nanopowders were used to coat FeSiAl spherical particles. In parallel, the effect of coating AlN nanopowders on the electromagnetic properties of FeSiAl SMCs was investigated. By performing energy dispersive spectroscopy analysis, AlN was confirmed to be attached to the FeSiAl spherical particles, indicating the existence of an excellent AlN coating quality. Although the incorporation of the AlN coating layer yielded a monotonic reduction in saturation magnetization intensity and effective permeability, it also effectively suppressed core losses. Due to the high-resistance of AlN, the high-resistance layer developed on the surface of the FeSiAl particles can substantially increase the resistivity of FeSiAl SMCs, and then the eddy current loss was suppressed. When coated with 1.5 wt% AlN, the FeSiAl SMCs exhibited the lowest core losses of 394 kW m−3 at 100 kHz, 100 mT, and room temperature. The proposed AlN-coated FeSiAl SMCs in this work exhibited a good overall performance, and are expected to be applied in high-performance inductor devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Luheng Wang,Gaige He
The assessment of buried flaws in the interlayer structure of curved metal is crucial to system safety. To improve the flexibility of eddy current sensor, an intrinsically flexible flaw sensing probe made of coil-shaped conductive polymer composite is proposed. The experimental data show that the response signal of the coil-shaped composite changes at the flaw and increases with the increases of flaw height/length, with a maximum sensitivity of 0.435 mV/mm for differential amplitude and 4.904 °/mm for differential phase. The results show that the height of the characteristic signals in the response signals reflects the change in flaw height, and the length of the characteristic signals in the response signals reflects the change in flaw length. The relative change rate of the coil-shaped composite is higher than that of a metal coil of the same structure. The above results have laid a preliminary foundation for using the coil-shaped composite to detect flaws.
研究领域:
材料科学
·
无损检测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）