CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Wei Zhan,Jinying Du,Lingchao Kong,Jun Zhang,Wei Zuo
Efficient and selective capture of phosphate from wastewater is critical to inhibit water eutrophication and supplement phosphate sources. Adsorption, as a simple and environmental-friendly approach, can realize phosphate recovery from wastewater. In order to enhance capture efficiency, adsorption capacity and reusability, magnetic 3D Fe 3 O 4 @ZnO nanocubes with uniform active sites were tailor-designed by hydrothermal-atomic layer deposition method for phosphate removal from water under weak magnetic field (WMF). Ultrafast capture of phosphate (94.8% in 5 min) was achieved by Fe 3 O 4 @ZnO composite under WMF due to the improvement of surface area and electrostatic interaction. More importantly, the synergistic effect of Lorentz force and electrostatic attraction promoted the transfer of phosphate anions to Fe 3 O 4 @ZnO surface and pores in one step, breaking the adsorption limitation induced by intraparticle diffusion. Isotherms fitting indicated that multilayer adsorption occurred on Fe 3 O 4 @ZnO surface with superior adsorption capacity of 100.3 mg/g. Moreover, the Fe 3 O 4 @ZnO exhibited excellent selectivity competing with co-existing matters in wastewater. Mechanism exploration found that inner-sphere complexation by ligand-exchange played a major role in the adsorption process. This easily separable and recyclable adsorbent was demonstrated to be a promising candidate for efficient phosphate capture in real sewage. Also, this study provided a novel approach with WMF application in magnetic separable adsorption system for contaminants remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Intelligent Systems
·
2024
·
IF 6.8
Yang Liu,Ying Feng,Linlin Liu,Miao An,Huaming Yang
Micro/nanorobots (MNRs) are promising for biomedical applications due to their unconstrained nature and small enough size to pass through many tiny environments. However, the efficient movement of MNRs in liquid environments is still a challenge due to the low Reynolds number environment and the Brownian motion of particles. Herein, emerging MNRs with hydrogel-loaded magnetic particles are designed. The proposed hydrogel MNRs (HMNRs) exhibit biocompatible and controllable characteristics. The motion controllability of HMNRs is realized by applying oscillating magnetic field and customized magnetic field. Experimentally, it is demonstrated that the HMNR swarms driven by the oscillating magnetic field exhibit a faster motion speed than the MNR swarms composed of magnetic particles. The HMNRs show precise controllability of the movement in the complex pipeline under the control of customized magnetic field. This method can offer a more benign approach to the general production of HMNRs for biological applications.
研究领域:
生物医学工程
·
纳米技术
·
机器人学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Mofan Li,Donghai Yang,Lei Tian,Haotian Liu,Liangyu Cai,Limin He
Combining a magnetic field with an electric field offers a promising approach for enhancing oil–water separation, yet its underlying mechanisms are not fully understood. We systematically investigated the dynamic deformation of salt-containing water droplet suspended in oil under an electric–magnetic coupling field. Integrating high-speed camera experiments with molecular dynamics simulations, we found that the dynamic response amplitude of droplet is reduced compared to a single electric field. Our analysis suggests that ions deflect under electric–magnetic coupling, affecting ion enrichment and water molecule polarization, thereby weakening droplet tip charge and induced electric forces, which suppresses droplet deformation. Increasing the electric capillary number and ion concentration enhances suppression, whereas improving the electric field frequency to 500 Hz almost eliminates this suppression effect. Notably, the degree of droplet deformation inhibition remains consistent across different viscosity ratios. These research findings offer insights for designing dehydrators to intensify oil–water separation.
研究领域:
物理学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Jing Cao,Zixuan Zhang,Shuangming Wang,Zhiying Sun,Jiahao Li,Yao Wang,Xiaoxue Xu,Zhixu Ye,Haiming Zhang
The performance of semiconductor sensors is determined by reaction kinetics, conductivity, and electron mobility, which are undoubtedly closely related to the electron motion behavior. Therefore, the effective regulation of electronic states is crucial for improving gas sensing properties. Previous methods of enhancing the gas-sensing performance have induced complex material modifications, and the extent of performance improvement is usually very limited. Further optimization of the gas sensing performance requires continuous efforts to advance new technologies. Toward this issue, a novel magnetic field-induced strategy is adopted to boost the carrier transfer efficiency of nonferromagnetic semiconductors. The gas sensing investigation results manifest that the applied magnetic field can effectively enhance the sensitivity and reduce the baseline resistance. The In2O3 NC-2 (In2O3 nanocubes) with an applied magnetic field have a greatly enhanced response of 161.4 toward 100 ppm formaldehyde, which is 2.5 times higher than that without magnetic field. The enhanced gas sensing properties can be mainly attributed to magnetization of reactive materials, which makes the orientation of electronic magnetic moments consistent, thus greatly contributing to reactivity. This work introduces a practical approach to effectively improve gas sensing performance without further morphology optimization, noble metal catalysis, structural modification, and material cladding. The results of this study provide new insights for designing novel gas sensors to improve the gas sensing performance.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 15
·6354-6364
·
IF 3.5
Zhu Qijing,Zhang Chaoyun,Peng Xiaoling,Li Jing,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Amorphous FeSiB/Al 2 O 3 soft magnetic composites were successfully fabricated in this work by applying an external magnetic field perpendicular or parallel to the magnetic toroidal surface, aiming to investigate the influences of magnetic field orientation on their structures and magnetic properties. The results indicate that amorphous FeSiB particles can form chain-like clusters aligned parallel to the direction of the applied magnetic field, which effectively reduces the magnetic reluctance along this direction. The magnetic toroidal with parallel orientation exhibits the highest effective magnetic permeability of 23.8 and a magnetic loss of 43.693 kW/m 3 at 590 kHz and 10mT, which is superior to both the non-oriented and perpendicularly oriented ones due to its optimized microstructure that reduces magnetic reluctance along the working circuit.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mofan Li,Donghai Yang,Shiyi Lv,Xinming Zhao,Jianwei Wang,Minmin Xia,Limin He
Electric field-based synchronous coupling with magnetic fields has shown great potential in enhancing the efficiency of electric dehydration for crude oil. However, the mechanisms underlying electric-magnetic coupling and its influence on droplet coalescence are not yet entirely understood. This study aims to investigate the coalescence dynamics of salt-laden water droplets in oil under an electric-magnetic coupling field. Experimental investigations using high-speed cameras and simulations employing electrohydrodynamic/molecular dynamic methods were conducted to elucidate differences in critical coalescence conditions. The results revealed a significantly higher critical electric field strength required for droplet coalescence under the influence of an electric-magnetic coupling field compared to a single electric field. This behavior can be attributed to changes in the migration direction and aggregation region of ions caused by the electric-magnetic coupling effect. Consequently, the charge at the end of droplets decreases, and the weight of the electric field force competes with the capillary force, thereby hindering coalescence. Furthermore, the study revealed that at an ion concentration of 1000 mg·L −1 , the critical electric field strength exhibited a maximum enhancement rate of 18.2 %. This enhancement can be attributed to the combined effect of ionic migration, which becomes more pronounced at higher concentrations, and the influence on the polarization of water molecules. However, when the electric field frequency was increased to 500 Hz, the migration of ions was shortened, resulting in a significantly reduced enhancement rate of only 0.909 %. Finally, the mathematical relationships between the coupled magnetic field reinforced critical electric field strength for different control parameters were determined by fitting the data points. In summary, this study provides novel scientific insights into the deep dehydration of crude oil by investigating the effects of electric-magnetic coupling on droplet coalescence. The findings present valuable guidance for optimizing the efficiency of dehydration processes and ensuring the safe and stable production in oil industrial applications.
研究领域:
石油工程
·
电动力学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Yaode Li,Yanyu Wu,Mingshuai Qiao,Cong Qi,Zhiguo Zhang
Nanofluid boiling heat transfer in microchannels has the advantages of small size and high heat transfer efficiency, and can meet the requirements of large heat load and high structural integration. In this paper, the enhanced heat transfer characteristics experiment of nanofluids under electro-magnetic co-excitation were studied on a microchannel boiling flow experimental platform. The generation, deformation and motion mechanism of bubbles in nanofluids under electro-magnetic co-excitation were studied by high-speed photography and numerical simulation, achieving microscopic visualization of nanofluids. The experiment shows that the small bubbles are affected by the electric field force and pass through the electrode wire, and perform regular lateral reciprocating motion between the two sides of the wall. This motion of the bubbles can not only strengthen the orderly disturbance inside the fluid, but also will not disrupt the heat transfer mechanism between various media, making the heat transfer enhancement and not chaotic. Magnetic excitation causes the nanoparticles to form a magnetic coupling structure along the direction of the magnetic field, the average strengthening effect increased to 29%. When the current is applied and the electromagnetic coupling field is formed, the heat transfer effect is improved by 36%.
研究领域:
热力学
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纳米科技
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传热学
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 12
·1529
·
IF 2.891
Tao Zhang,Yuguo Deng,Bo Zhou,Jiayu Liu,Yufeng Su,Mu Li,Weiwei Zhang
Swarming robotic systems, which stem from insect swarms in nature, exhibit a high level of environmental adaptability and enhanced tasking capabilities for targeted delivery and micromanipulation. Here, we present a strategy that reconfigures paramagnetic nanoparticles into microswarms energized by a sawtooth magnetic field. A rotary-stepping magnetic-chain mechanism is proposed to address the forming principle of disk-like swarms. Based on programming the sawtooth field, the microswarm can perform reversible transformations between a disk, an ellipse and a ribbon, as well as splitting and merging. In addition, the swarms can be steered in any direction with excellent maneuverability and a high level of pattern stability. Under accurate manipulation of a magnetic microswarm, multiple microparts with complicated shapes were successfully combined into a complete assembly. This reconfigurable swarming microrobot may shed light on the understanding of complex morphological transformations in living systems and provide future practical applications of microfabrication and micromanipulation.Keywords:microrobot;disk-like swarm;sawtooth magnetic field;microassembly
研究领域:
生物医学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Water
·
2021
·Vol. 13
·期 13
·1724
·
IF 3.103
Liping Liang,Fenfen Xi,Liubiao Cheng,Weishou Tan,Qiang Tang,Xu Meng,Zhenjiong Wang,Bo Sun,Aijie Wang,Jian Zhang
The coupling use of the heterogeneous Fenton-like process (zero-valent iron (Fe0)/H2O2) and weak magnetic field (MWF) for bisphenol A (BPA) abatement was systematically investigated in this study. Though both the Fe0/H2O2and WMF-Fe0/H2O2processes are sensitive to pH, WMF remarkably enhanced BPA removal under the pH range of 3.0–6.0 by 0.5–9.5 times. The characterization of Fe0confirmed the role of WMF in promoting the corrosion of Fe0. Radicals, rather than Fe intermediates, were responsible for BPA degradation. Due to the presence of Cl–as the background ions and its reactivity towards HO•, reactive chlorine species (RCS, i.e., Cl•and Cl2•−) were produced and considerably contributed to BPA degradation. In addition, ~37% and 54% of degraded BPA was ascribed to RCS in the presence of 2 and 100 mM of Cl−, respectively. However, 1.9 mg/L of ClO3−was detected in the presence of 2 mM of Cl−in the WMF- Fe0/H2O2process. HCO3−could diminish ClO3−generation significantly through transforming RCS. The concentration of ClO3−decreased by 74% and 82% with dosing 1 and 10 mM HCO3−, respectively. The results of this study suggest that the WMF-Fe0/H2O2process is a promising approach for BPA removal.Keywords:bisphenol A;zero-valent iron;hydrogen peroxide;weak magnetic field;chloride
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2020
·Vol. 11
·期 1
·171-179
·
IF 3.064
Shi-Tong Xu,Shi-Tong Xu,Fei Fan,Shu Chen,Yanzhao Xing,Yuebo Gao,Huixin Li,Guangcheng Niu,Sheng-Jiang Chang,Sheng-Jiang Chang,Sheng-Jiang Chang
In this work, a new strategy was proposed for active control of mm-thick liquid crystals (LC) cell to realize the polarization manipulation in terahertz (THz) regime, which through the electric field control and static magnetic field pre-anchoring. The LC cell was fabricated by a nematic 5CB LC and two silica substrates that were coated with the graphite layer as the transparent electrode. Under the pre-anchoring of the static magnetic field, the optical axis of LC can be precisely controlled by the variable electric field. By using a THz-TDS with a wire grid polarizer, the output THz polarization from the LC cell can be deduced from the amplitude and phase shift of ±45° components. Here, we systematically analyzed three different outfield configurations. Only if the ±45° components that output from the polarizer have phase shifts, can the polarization state conversion be realized. The results show that the linear to circular or the cross-polarization conversion were realized under the specific electric field. This work provides a new approach for the thick-LC layer anchoring and orientation control, and also the tunable polarization manipulation of THz LC devices.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Feifan Huang,Chao Liu,Siqin Cheng,Tao Li
Microwave thermal regeneration is an emerging technique for activated carbon regeneration, which has been extensively investigated experimentally. However, relevant simulation receives limited attention, with the mechanism of microwave thermal regeneration not very well understood. In this study, a multiphase, porous media model coupling electromagnetic , heat and mass transfer is established to study microwave thermal regeneration characteristics of spent activated carbon. The results show that inhomogeneous electromagnetic distribution in the cavity is the main factor contributing to the inhomogeneity of the sample temperature. The desorption of adsorbate in the hot spot region (dry basis) mainly relies on microwave radiation heating. The desorption of adsorbate in the cold spot region (wet basis) depends on heat conduction and convection in the hot spot region, as well as capillary diffusion caused by the concentration gradient . In addition, the uniformity of sample temperature distribution is optimized by rotating microwave thermal regeneration, and energy consumption is reduced by about 58 %. Therefore, this model can provide technical guidance for optimizing the microwave thermal regeneration process of spent activated carbon while explaining the mechanism of microwave regeneration.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Rui Ma,Taotao Fu,Qindan Zhang,Chunying Zhu,Youguang Ma,Huai Z. Li
This paper investigated the breakup dynamics of ferrofluid droplet in a microfluidic T-junction with the magnetic field. Droplet breakup types with permanent obstruction, part obstruction and without obstruction were observed. The droplet breakup processes with permanent and part obstruction could be divided into squeezing, transition and pinch-off stages. The minimum width of droplet neck could be scaled as power-law relationships with time for squeezing stage and with remaining time for the last two stages. The droplet breakup process without obstruction has only last two stages. The results show that the magnetic field could affect the dynamics of droplet breakup.
研究领域:
流体力学
·
生物医学工程
✓ 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）