ENERGY CONVERSION AND MANAGEMENT
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2017
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IF 5.589
Lei Shi,Yurong He,Yimin Huang,Baocheng Jiang
Solar power, as an important source of renewable energy during the recent years, holds a great potential to produce vapor. Solar-assisted evaporation systems usually rely on the concentration of nanofluids and the intensity of solar illumination. However, the nanofluids used in these systems can cause secondary pollution. These issues severely limit large-scale application of the solar evaporation technology. In this study, we developed a solar thermal evaporation system based on carbon nanotubes (CNTs) decorated with magnetic Fe 3 O 4 nanoparticles (Fe 3 O 4 @CNT), which could be separated from water under the action of a magnetic force. The two components (with different ratios) of these Fe 3 O 4 @CNT differed in their magnetic and thermal properties. A high evaporation efficiency (60.3%) was obtained with a 0.5 g/L Fe 3 O 4 @CNT nanofluid under a solar illumination power of 10 sun (1 sun = 1 kW·m −2 ), which was achieved by heating the nanofluid locally rather than by increasing the temperature in bulk. A thermal receiver efficiency of 88.7% was obtained with a 0.5 g/L Fe 3 O 4 @CNT nanofluid under a solar illumination power of 1 sun achieved by a bulk temperature increase. The Fe 3 O 4 @CNT nanoparticles could be separated from water at a rate faster than that of the Fe 3 O 4 nanoparticles. The recovery rate of the Fe 3 O 4 nanoparticles and Fe 3 O 4 @CNT ranged from 97.9% to 98.7%. The Fe 3 O 4 nanoparticles in Fe 3 O 4 @CNT enhance their ability to absorb the solar energy, thus making it higher than that of CNTs. The recovery rate and efficiency could be controlled by adjusting the magnetic field strength and the ratio of Fe 3 O 4 and CNTs. Thus, this system study provides an approach to not only significantly reduce the material consumption in the design of solar evaporators, but also to realize broad solar energy applications such as seawater desalination and vapor generation.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2018
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IF 6.377
Lei Shi,Yurong He,Yanwei Hu,Xinzhi Wang
Currently, natural convection with nanofluid depends on the addition of nanoparticles with a high thermal conductivity to increase the heat transfer performance, often leading to limited increase in heat transfer rate and efficiency. Herein, a magnetically controlled heat transfer method was evaluated. This method enables a rectangular enclosure filled with Fe 3 O 4 @CNT nanofluid to achieve controllable heat exchange. Compared with conventional natural convective heat transfer, the magnetically controlled heat transfer method increased the thresholds of heat transfer efficiency by increasing the convective heat transfer. The heat transfer and flow of natural convection can be controlled by the strength and direction of magnetic field. The increase in heat transfer depends on the direction of magnetic field, and the strength of magnetic field determines the degree of heat transfer. This study provides a method to achieve superior convective heat transfer coefficients by controlling the magnetic nanoparticle distribution in a rectangular enclosure.
研究领域:
热力学
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材料科学
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工程热物理
✓ 已验证
DOI
高影响因子
Nature Communications
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2020
·Vol. 11
·期 1
·1-13
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IF 12.121
Qiao Yuqian,Liu Xiangmei,Li Bo,Han Yong,Zheng Yufeng,Yeung Kelvin Wai Kwok,Li Changyi,Cui Zhenduo,Liang Yanqin,Li Zhaoyang,Zhu Shengli,Wang Xianbao,Wu Shuilin
Owing to the poor penetration depth of light, phototherapy, including photothermal and photodynamic therapies, remains severely ineffective in treating deep tissue infections such as methicillin-resistant Staphylococcus aureus (MRSA)-infected osteomyelitis. Here, we report a microwave-excited antibacterial nanocapturer system for treating deep tissue infections that consists of microwave-responsive Fe 3 O 4 /CNT and the chemotherapy agent gentamicin (Gent). This system, Fe 3 O 4 /CNT/Gent, is proven to efficiently target and eradicate MRSA-infected rabbit tibia osteomyelitis. Its robust antibacterial effectiveness is attributed to the precise bacteria-capturing ability and magnetic targeting of the nanocapturer, as well as the subsequent synergistic effects of precise microwaveocaloric therapy from Fe 3 O 4 /CNT and chemotherapy from the effective release of antibiotics in infection sites. The advanced target-nanocapturer of microwave-excited microwaveocaloric-chemotherapy with effective targeting developed in this study makes a major step forward in microwave therapy for deep tissue infections.
研究领域:
微生物学
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纳米技术
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医学工程
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传染病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Analytical Chemistry
·
2019
·
IF 1.682
Wei Zhang,Xin Zhao,Hengling Meng,Jin Yang,Xiang Wei,Yong Min
A novel ultrasound-assisted magnetic solid-phase extraction (UA-MSPE) was developed for the separation/preconcentration of trace amounts of pyrethroids (fenpropathrin, fenvalerate, deltamethrin, and bifenthrin) in Paris polyphylla sample using carbon nanotubes based on Fe3O4 magnetic nanoparticles (Fe3O4@CNT MNPs), and high-performance liquid chromatography-UV is described. High recoveries of pyrethroids were obtained at a low MNPs concentration because sonication enhances the contact chances between magnetic nanoparticles and extractable analytes and promotes the extractability of the MSPE process. After the extraction, the adsorbent can be conveniently separated from the sample solution by an external magnet, and the adsorbed analytes were eluted from magnetic Fe3O4@CNT. The main factors influencing the extraction efficiency including the amount of the MNPs, the extraction time, the pH of sample solution, the sonicating time, and the desorption conditions were studied and optimized. Under the optimized experimental conditions, a good linearity was observed in the range of 1-100.0 ng mL−1 for all the analytes, with the correlation coefficients (r) ranging from 0.9962 to 0.9991. The limits of detection of the four pyrethroids are 0.53, 0.26, 0.47, and 0.67 ng mL−1, respectively. The recoveries of the method were in the range between 85.5% and 93.2%. This method is much faster and more effective than traditional SPE methods, and it is promising for the analysis of pyrethroids residues.
研究领域:
分析化学
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药学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yanzhi Cai,Tingting Liu,Laifei Cheng,Siyu Guo,Haiming Yu,Yuhan Wang,Dengpeng Chen,Zhongyi Hu,Jianing Liu,Wenxu Wei,Junqiang Ma
Polycarbosilane nanofiber-ferroferric oxide (PCS nf -Fe 3 O 4 ) films were assembled on both sides of carbon nanotube-polyaniline buckypaper (CNT-PANI BP) by electrospinning to obtain PCS nf -Fe 3 O 4 /CNT-PANI BP/PCS nf -Fe 3 O 4 sandwich porous composites, with a diameter of 110–120 mm and a thickness of 150–200 µm. The Fe 3 O 4 nanoparticles adhered on the PCS nanofibers formed a bamboo-like or plum-like structure. The PANI nanoparticles were uniformly embedded in the CNT network. Both PCS nf -Fe 3 O 4 film skin layers were well bonded to the CNT-PANI BP core layer, with two main forms of the interlayer interface of rattan-like and root-like entanglement. The sandwich composite film (SCF) with 15.1 wt% Fe 3 O 4 in the skin layers had a density of 0.97 g/cm 3 , a porosity of 61% and a total pore area of 30.1 m 2 /g, with a multimodal pore size distribution. The SCFs were superflexible, being tightly wound around a 4 mm diameter glass rod and repeated 100 times without damage. The absorption performance of the SCF was significantly improved by introducing Fe 3 O 4 nanoparticles into its skin layers. The SCF with 11.8 wt% Fe 3 O 4 in its skin layers achieved optimal dielectric and magnetic loss matching, with minimum reflection loss of − 43.54 dB and maximum effective absorption bandwidth of 6.97 GHz.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
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