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
ACS Nano
·
2024
·
IF 15.8
Naiyan Wu,Pengxiang Mao,Ningbo Chang,Yanrun Zhou,Weifeng Yang,Fan Fu,Xixi Liu,Tianyi Ji,Junyi Zhao,Yuxuan Huang,Yaogang Li,Michael D. Dickey,Wei Gong
As communication technologies have become omnipresent, the prevalence of electromagnetic field (EMF) exposures poses possible health risks, particularly to vulnerable groups such as pregnant women. In response, we introduce a triboelectric ferrofluid fiber (TFF) that moves in response to EMF, thereby generating charge in a way that is self-powered. The TFF is flexible, stretchable (470%), and can be woven into fabrics. The TFF utilizes a soft-contact (ferrofluid-silicon rubber fiber) triboelectric core layer to enhance its sensitivity to EMF, enabling it to detect even minor electromagnetic fluctuations, such as those from cell phone typing. By integrating hydrogel electrodes that offer conductivity and minimal electromagnetic interference shielding, the TFF’s sensitivity to magnetic fields is further amplified. Moreover, its open-circuit voltage output is increased by 50% compared to the conventional electrodes. Building on this technology, we designed a smart fabric for environmental early warning and potential real-time pulse monitoring, specifically tailored for the safety and healthcare needs of vulnerable groups. Finally, we developed a sensing and communication apparel (SCA) by integrating TFF into the apparel and exploring its capabilities in a wireless transmission of warning signals and long-distance NFC functionality.
研究领域:
材料科学
·
生物医学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 8
·
IF 1.4
Zheng Yu,Song Rujuan,Wei Shengjie,Dong Lei,Chen Yazhou
Long-term potentiation (LTP) in the Schaffer-CA1 region of the hippocampus is closely related to learning and memory. Magnetic stimulation, as an effective physical means of regulating synaptic plasticity, has received widespread attention. However, research on the mechanism of the effect of different frequencies of magnetic fields (MFs) on LTP is relatively scarce. This article focuses on Ca 2+ , Na + , K + , NMDA receptors, and AMPA receptors that play important roles in the process of MF regulation of LTP. A combined electrophysiological and pharmacological approach was used to identify Ca 2+ as a key factor in the modulation of LTP by MFs of different frequencies. Subsequently, further experiments revealed that low levels of intracellular Ca 2+ concentration ([Ca 2+ ] i ) intensified the inhibition of low-frequency MFs on LTP, while high levels of [Ca 2+ ] i enhanced the promotion effect of high-frequency MFs on LTP, indicating a positive correlation between [Ca 2+ ] i levels and MF regulation of LTP levels. The research results of this article may help explore the deeper relationship between different frequencies of MFs and synaptic plasticity, and they also have a certain reference value for magnetic stimulation therapy in the treatment of neurological diseases related to LTP injury or learning and memory deficits.
研究领域:
神经科学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Peng Cheng,Chuang Liu,Sicong Du,Chongxuan Xu,Xu Han,Ting Zhu,Wenyan Liang
A novel magnetic separation method has been developed to efficiently separate and recover powder particles used in water or wastewater treatment processes. The magnetic composites were prepared through the grafting of 2,4-bis(dimethylamino)-6-chloro-(1,3,5)-triazine (BDAT), chitosan (CTS), and SiO 2 onto the Fe 3 O 4 surface, obtaining Fe 3 O 4 @BDAT, Fe 3 O 4 @CTS, Fe 3 O 4 @CTS-BDAT, Fe 3 O 4 @SiO 2 @BDAT, and Fe 3 O 4 @SiO 2 @CTS-BDAT. g-C 3 N 4 , Ni/Fe-PAC, and La/Al-BTC were chosen as the target particles. Results showed that Fe 3 O 4 @CTS-BDAT exhibited the best separation performance, achieving efficiencies of 98.3 %, 97.2 %, and 99.1 % for the three target particles, respectively. These high efficiencies were maintained over a broad pH range (3.0–11.0) and initial target particle concentrations (50–5000 mg/L). The target particles could be detached from the magnetic aggregates using an electromagnetic field, with efficiencies exceeding 75.3 %. Characterization using SEM, XPS, and FTIR revealed that Fe 3 O 4 @CTS-BDAT possessed a microsphere cluster structure, with a saturation magnetization of 64.02 emu/g, a point of zero charge (pH PZC ) of 7.7, and a d 50 value of 3.56 μm. Microscopic image analysis displayed that fluid kinetic energy and magnetic dipole force facilitated the formation of magnetic aggregates during the stirring stage. The size of these aggregates increased from 2–10 to 15–30 μm during stirring and further expanded to 18–37 μm during the separation stage. Particle image velocimetry (PIV) analysis indicated that the magnetic aggregates migrated towards the magnet via eddy currents, with maximum velocity from 0.532 to 1.412 m/s. DLVO and MDLVO models revealed that the magnetic interaction energy of Fe 3 O 4 @CTS-BDAT was sufficient to surpass electrostatic repulsion, thereby enabling efficient capture and separation of target particles.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 3
·694-699
·
IF 3.117
Muhammad Usman Amin,Lingling Zhang,Rui Hao,Dongjie Zhang,Hongjun You,Jixiang Fang
We successfully prepared silver dendritic nanostructures with a well-defined and precisely tailored trunk and branches, as well as decorated nanoparticles, by a simple and controllable two-electrode electrochemical deposition system using different AgNO3 concentrations and deposition potentials. The prepared nanostructures are used as SERS substrates for the detection of crystal violet molecules with a minimum detection limit of 10−11 M. Finite-difference time-domain (FDTD) simulation is used to analyze the SERS activity of diverse silver dendritic nanostructures. The SERS and FDTD results revealed that the pine leaf-like structure displays excellent sensitivity and reproducibility compared to all other structures due to a large number of hotspot sites between branch–branch and branch–particle junctions. This article provides a good understanding of electromagnetic field enhancement and shows that various silver dendritic nanostructures could be potential candidates for SERS-based detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 20
·5751-5760
·
IF 1.65
Jiamin Quan,Yong Zhu,Jie Zhang,Junyin Li,Ning Wang
We report an effective and simple method to further enhance the surface-enhanced Raman scattering (SERS) by silver (Ag) nanoparticles (AgNPs) self-assembling into the nanogaps of an Ag nanoisland (AgNIs). The AgNIs prepared by dewetting of Ag film created a nanorough surface, which induced the Ag nanoparticles to regularly deposit into the nanogaps. AgNPs and AgNIs samples were also prepared for comparative analysis. Their SERS activities were investigated theoretically and experimentally. Experimental enhancement factors (EFs) for AgNPs, AgNIs, and AgNPs decorated AgNIs substrate (AgNPs-AgNIs) were ∼107, ∼106, ∼108, respectively, with relative standard deviation (RSD) of 66.1%, 12.9%, and 13.2%. Remarkable enhancement (EF≈108) and excellent reproducibility (RSD=13.2%) indicated the AgNPs-AgNIs had a high potential in practical application. Electromagnetic simulation using COMSOL Multiphysics demonstrated that the additional enhancement of the SERS effect could be mainly attributed to the improvement of the local electromagnetic field. Moreover, the deposition process of Ag nanoparticles was analyzed in detail to understand the reproducibility of AgNPs-AgNIs.
研究领域:
材料科学
·
光谱学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Bo Ma,Jinglei Bi,Jian Lv,Chuncai Kong,Pengxu Yan,Xintian Zhao,Xiaojing Zhang,Tao Yang,Zhimao Yang
Constructing the heterostructure with noble metals on semiconductors is recognized as a prospective approach to enhance hydrogen generation. In this study, Au-Cu 2 O heterostructure particles (HPs) with unique inter-embedded heterostructures were controllably fabricated by a universal reaction between Cu particles and HAuCl 4 solution. Besides, the boosted catalytic performance from the plasmon effects, Au-Cu 2 O inter-embedded heterostructure exhibits additional structural advantages to promote the photocatalytic property of hydrogen generation overall water splitting. Under the visible light, the H 2 evolution rate of the Au-Cu 2 O HPs is 152 and 22 times higher than that of pure Cu 2 O and traditional Cu 2 O@Au HPs with Au anchored on the surface of Cu 2 O, respectively. On one hand, inter-embedded heterostructure brings more contact areas as the active sites to carry out the direct electron transfer and electromagnetic transfer for the reduction. On the other hand, the finite difference time domain (FDTD) simulations indicate that enhanced electromagnetic fields of Au-Cu 2 O HPs form a netlike structure to maximumly accelerate the transfer of hot electrons and separate the electron–hole pairs. Under the joint action of the two, the inter-embed heterostructure exhibits superior photocatalytic property, demonstrating that this study could instruct the design of other metal–semiconductor photocatalysts.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Wang Jianchao,Luo Hongsheng,Zhang Minghai,Zu Xihong,Li Zhiwei,Yi Guobin
Silver nanowires (AgNWs) were chemically etched to significantly increase the surface roughness and then self-assembled on the liquid/gas interfaces via the interfacial assembly method to obtain aligned chemically etched silver nanowire films. The as-fabricated silver nanowire films were used as novel surface-enhanced Raman scattering (SERS) substrates. The morphologies and plasmon characteristics of the substrates were investigated using multiple measurement methods. The performance of as-fabricated substrates was measured using rhodamine B as a probe. The detection limitation can be as low as 10 −11 M. The greatly improved plasmonic properties are attributed to the efficient light coupling and larger electromagnetic field enhancement. The novel set of SERS substrates of aligned chemically etched AgNWs is believed to be important for efficient, homogeneous, and ultrasensitive SERS sensing applications.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Kai Yu,Yuxuan Tu,Mao Wan,Yongliang Guo,Shiqi Liu,Huimin Li,Yanchun Fan,Gang Zhao,Songxiong Zhong,Cun Liu,Xubiao Luo
Individual application of sulfide modification and electromagnetic field (EMF) can enhance the reactivity of nanoscale zero-valent iron (nZVI), yet the potential of both in combination is not clear. This work found that the reactivity of nZVI towards decabromodiphenyl ether was significantly enhanced by the combined effect of sulfidation and EMF. The specific reaction rate constant of nZVI increased by 7 to 10 times. A series of characterization results revealed that the sulfidation level not only affects the inherent reactivity but also the magnetic-induced heating (MIH) and corrosion (MIC) of nZVI. These collectively influence the degradation efficiency of nZVI under EMF. Sulfidation generally diminished the MIH effect. The low degree of sulfidation (S/Fe = 0.1) slightly reduced the MIC effect by 21.4%. However, the high degree of sulfidation (S/Fe = 0.4) led to significantly enhanced MIC effect by 107.1%. For S/Fe = 0.1 and 0.4, the overall enhancement in the reactivity resulting from EMF was alternately dominated by the contributions of MIH and MIC. This work provides valuable insights into the MIH and MIC effects about the sulfidation level of nZVI, which is needed for further exploration and optimization of this combined technology.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Dong Jun,Zhao Xing,Gao Wei,Han Qingyan,Qi Jianxia,Wang Yongkai,Guo Sandong,Sun Mengtao
The unique photonic effect of self-assembled metal nanoparticles is widely used in many applications. In this article, we prepared self-assembled gold nanorod (GNR) vertical arrays substrate by an evaporation method and found that the morphology of the substrate can be effectively regulated by changing the immersion time in the target molecules solution to obtain different Raman enhancement effects. We separately calculated the local electromagnetic field of the GNR vertical arrays and disorder substrate by the finite element method (FEM), which was consistent with the experimental results. Based on optimal soaking time, the sensitivity, reproducibility, and stability of substrates were separately studied. The experimental results show that the GNR vertical arrays can detect Rhodamine 6G (Rh6G) at concentrations as low as 10 −11 M and exhibit good reproducibility and stability due to local electromagnetic (EM) field enhancement caused by the coupling of adjacent nanorods. Thus, our work can demonstrate that the substrate has excellent surface-enhanced Raman scattering (SERS) activity and the obtained GNR vertical arrays have great potential for biosensor and biodetection.
研究领域:
纳米技术
·
光学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2016
·Vol. 48
·期 3
·443-447
·
IF 2.395
Yanna Yang,Fu Wan,Pinyi Wang,Xiping Zeng,Yunpeng Jia,Haiyang Shi,Weigen Chen,Yingzhou Huang
For the induced image charge on surface, the metal film as a substrate brings the metal nanostructures some novel surface plasmon-related phenomenon, e.g. electromagnetic field redistribution and energy focusing. In this work, the surface-enhanced Raman scattering in sandwich structure consist of Au nanoplate and Au film adsorbed with molecule monolayer is investigated. The surface-enhanced Raman scattering spectra point out that the shielded Raman signals of molecule under metal nanoplate could be collected from this metal-encapsulated sandwich structure with the help of nanoparticle. This interesting phenomenon is further confirmed by the simulated electromagnetic field where the light power in the gap between Au nanoplate and Au film is greatly enhanced with a nanoparticle located. The further results also demonstrate this nanoparticle assisted Raman information acquisition is highly influenced by the thickness of encapsulated nanoplate and size of nanoparticle. Furthermore, the positive results of nanoparticles with different shapes in this interesting phenomenon provide an extensive application prospects including surface-enhanced Raman scattering detection, light information storage and selective harvesting, location detection of light information, photocatalysis, etc. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
光学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1501
·
IF 3.1
Xiaohai Wang,Zhuanzhuan Shi,Zhikai Wang,Xiaoshuai Wu
The microbial hybrid system modified by magnetic nanomaterials can enhance the interfacial electron transfer and energy conversion under the stimulation of a magnetic field. However, the bioelectrocatalytic performance of a hybrid system still needs to be improved, and the mechanism of magnetic field-induced bioelectrocatalytic enhancements is still unclear. In this work, γ-Fe2O3magnetic nanoparticles were coated on aShewanella putrefaciensCN32 cell surface and followed by placing in an electromagnetic field. The results showed that the electromagnetic field can greatly boost the extracellular electron transfer, and the oxidation peak current of CN32@γ-Fe2O3increased to 2.24 times under an electromagnetic field. The enhancement mechanism is mainly due to the fact that the surface modified microorganism provides an elevated contact area for the high microbial catalytic activity of the outer cell membrane’s cytochrome, while the magnetic nanoparticles provide a networked interface between the cytoplasm and the outer membrane for boosting the fast multidimensional electron transport path in the magnetic field. This work sheds fresh scientific light on the rational design of magnetic-field-coupled electroactive microorganisms and the fundamentals of an optimal interfacial structure for a fast electron transfer process toward an efficient bioenergy conversion.
研究领域:
微生物学
·
生物能源
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）