Materials
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2023
·Vol. 16
·期 12
·4397
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IF 3.4
Siyuan Yang,Fei Wang,Zhe Zhang,Zhiming Liu,Jiliang Zhang,Kaiyong Jiang
Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2–18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of −14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < −7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.Keywords:carbonyl iron powders;absorption performance;ball-milling time;ball-milling rotation speed;electromagnetic parameters
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Petroleum Science
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2022
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IF 4.757
Han Jia,Xin Wei,Qiu-Xia Wang,Yuan-Bo Wang,Shi-Jie Wen,Fang-Ning Fan,Qiang Wang,Zhe Wang,De-Xin Liu,Pan Huang
Asymmetrically modified Janus graphene oxide (JGO) has attracted great attention due to its unique physical chemistry properties and wide applications. The modification degree of Janus nanosheets inevitably affects their interfacial activity, which is essential for their performances in enhanced oil recovery (EOR). In this study, the interfacial properties of Janus graphene oxide (JGO) with various modification degrees at liquid-liquid and liquid-solid interfaces were systematically evaluated via the measurements of interfacial tension (IFT), dilatational modulus, contact angle, and EOR efficiency was further assessed by core flooding tests. It is found that JGO-5 with higher modification degree exhibits the greater ability to reduce IFT (15.16 mN/m) and dilatational modulus (26 mN/m). Furthermore, JGO can construct interfacial and climbing film with the assistance of hydrodynamic power to effectively detach the oil from the rock surface and greatly enhance oil recovery. Moderately modified JGO-2 can highly improve recovery of residual crude oil (11.53%), which is regarded as the promising EOR agent in practical application. The present study firstly focuses on the effects of modification degrees on the JGO interfacial properties and proposes diverse EOR mechanisms for JGO with different modification degrees.
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ACS Applied Nano Materials
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2022
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IF 6.14
Tao Xian,Hongqin Li,Xiaofeng Sun,Yashan Huo,Lijing Di,Chenyang Sun,Hua Yang
The In2O3 nanoparticles were homogeneously attached on the BiOBr nanoplate surface to obtain S-scheme In2O3/BiOBr heterojunction photocatalysts by a hydrothermal route. The purity, crystal structure, chemical state, morphology, light absorption property, and photogenerated charge behavior of composites were investigated by XRD, SEM, TEM, HRTEM, XPS, UV–vis DRS, PL, ESR, and electrochemical tests. The removal of dyes (acid orange 7 (AO7), acid orange 10 (AO10), and rhodamine B (RhB)) and Cr(VI) was employed to evaluate the photocatalytic performance of In2O3/BiOBr composites irradiated by simulated sunlight. The results indicate that the photocatalytic performance of BiOBr can be remarkably promoted after the decoration of In2O3 nanoparticles, and the best photocatalytic activity was achieved over an 8% In2O3/BiOBr sample. The 8% In2O3/BiOBr sample also indicates outstanding synergistic photocatalytic performance for the removal of the heavy metal ion/dye mixture (AO7/Cr(VI) and RhB/Cr(VI)). It is found that the decoration of In2O3 nanoparticles can accelerate the transfer and separation of photoinduced electrons and holes in BiOBr nanoplates. The energy band structure, work function, and Fermi level of BiOBr and In2O3 were computed through the density functional theory calculation. Based on the above investigation, the photocatalytic mechanism of the S-scheme In2O3/BiOBr composite was discussed.
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NEUROSCIENCE LETTERS
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2022
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IF 3.197
Lingjun Yang,Gang Zhou,Junming Chen,Sainan Zhang
Background Based on the previous findings on the relieving role of gelsemine in neuropathic pain, this research aims to further investigate the relevant regulatory mechanism. Methods Targets of gelsemine were predicted using SwissTargetPrediction. The peripheral neuropathic pain rat model was established by ligating spinal nerves, and then gelsemine (10 μg for one day) or dipeptidyl peptidase 4 (DPP4) oligonucleotides (5 μg/day, for 7 days) was injected into intrathecal bolus of rats. The mechanical threshold (0, 1, 2, 4 h after the last injection) was examined to evaluate the mechanical allodynia of rats. After the mechanical threshold measurement, the rats were anesthetized with isoflurane and then sacrificed by cervical dislocation. IBA1- and DPP4-positive cells in the spinal dorsal horn of rats were determined using immunohistochemistry and immunofluorescence assays. The expressions of DPP4, IL-1β and TNF-α in the spinal dorsal horn of rats were measured by Western blot and quantitative real-time PCR. Results DPP4 was one of the targets of gelsemine. Gelsemine could elevate the down-regulated mechanical threshold, and lessen the up-regulated IBA1- and DPP4-positive cells and expressions of DPP4, IL-1β and TNF-α in the spinal dorsal horn of rats with neuropathic pain. DPP4 overexpression reversed the role of gelsemine in neuropathic pain. Conclusion Gelsemine relieves neuropathic pain by down-regulating DPP4 level in rats, providing a novel drug candidate and biomarker for neuropathic pain treatment.
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COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Chao Shu,Hao-Yu Zhao,Sai Zhao,Wenchao Deng,Peng Min,Xiao-Hang Lu,Xiaofeng Li,Zhong-Zhen Yu
With the increasing concerns about the shortage of fossil fuels and the environmental pollution, it is imperative to utilize clean and renewable solar energy. Although organic phase change materials have great potentials in storing and releasing thermal energy , the poor solar light absorption and low thermal conductivity limit their efficiencies in absorbing solar energy and converting it to thermal and electrical energies. Herein, highly thermally conductive phase change composites with enhanced thermal energy storage capabilities are prepared by constructing vertically aligned graphene/cellulose nanofiber aerogels (GCAs) followed by vacuum-assisted impregnation of paraffin for efficient temperature regulation and solar-thermal-electric energy conversion applications. An optimal GCA/paraffin phase change composite exhibits an exceptional thermal conductivity of 15.9 W m −1 K −1 at the low graphene loading of 3.35 wt%, a high latent heat retention of 98%, and a greatly enhanced shape stability. Furthermore, the phase change composite is efficient in the temperature regulation of a greenhouse and the solar-thermal-electric energy conversion. A high output voltage of 823.2 mV is achieved under the solar light irradiation of 5 kW m −2 . This work demonstrates a promising strategy for efficiently absorbing and converting solar energy, and storing and utilizing thermal energy for applications in energy-related devices and systems.
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Drug Design Development and Therapy
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2022
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IF 4.319
Yu Li,Zhan-Zhao Zhang
Background Excessive reactive oxygen species production caused by type 2 diabetes conditions can disrupt normal bone metabolism and greatly impair bone regeneration.Materials and methods In the present study, curcumin (Cur)-loaded microspheres were incorporated into a fish collagen nano-hydroxyapatite scaffold to promote bone repair under diabetic conditions by inhibiting the reactive oxygen species production.Results The drug release kinetic study showed that the Cur release from the composite scaffolds lasted up to 30 days. The sustained curcumin release from the scaffold significantly inhibited the overproduction of reactive oxygen species in mesenchymal stem cells caused by diabetic serum. Moreover, the Cur-loaded scaffold also remarkedly alleviated the negative effects of diabetic serum on the proliferation, migration, and osteogenic differentiation of mesenchymal stem cells. When implanted into bone defects in type 2 diabetic rats, the Cur-loaded scaffold also showed a greater bone formation capability compared to the pure scaffold.Conclusion The results of this study suggested that the novel controlled Cur release system may provide a promising route to improve bone regeneration in type 2 diabetic patients.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Yamei Wang,Dongdong Xiao,Hainan Yu,Yi Zhong,Linping Zhang,Xiaofeng Sui,Bijia Wang,Xueling Feng,Hong Xu,Zhiping Mao
The fabric-based wound dressings are hard to maintain a moist environment for wound healing while the hemostatic property and gas permeability of some hydrogel-based wound dressings are not ideal. This study first put forward a strategy of checkerboard-pattern wound dressing: 1) preparing the base fabric with hemostatic property, 2) printing multifunctional hydrogels onto one side of the base fabric to form checkerboard patterns, 3) modifying the other side of the base fabric to be hydrophobic. In this manner, the composite dressing not only maintained the advantages of hydrogels, but also inherited good mechanical property, hemostatic property, and gas permeability from the base fabric. Here, the cotton fabric was carboxymethylated to be MCF. To obtain multifunctional hydrogel, sodium carboxymethylcellulose was oxidated to introduce aldehyde groups to form Schiff base with amino groups in gelatin, besides, dopamine and Ag nanoparticles were introduced to endow the hydrogel with antioxidant property and antibacterial activity . The multifunctional hydrogel was printed onto one side of MCF, subsequently, the deposition of paraffin made the other side of this dressing become hydrophobic. The good performance of the obtained dressing in hemostatic process and wound healing demonstrated its potential in the field of wound treatment.
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Defence Technology
·
2022
·
IF 4.035
Junyu Lu,Haoruo Zhang,Yang Chen,Mushan Yuan,Mei Liang,Zhengguang Heng,Huawei Zou
In order to obtain the microwave absorption (MA) materials with light weight, high efficiency and tunable properties, the carbonized mesophase pitch (CMP) with the variation in carbonization temperatures and particle sizes were prepared and characterized. The carbonization temperature mainly controlled the graphitization degree of the CMP to affect their conductive loss. The carbon residues were generated on the CMP surface when the temperature was higher than 700 °C, which contributed significantly to the polarization loss of the CMP. For scale regulation, the segregation between the particles in the paraffin ring caused by the reduction particles of CMP carbonization at 750 °C (750 CMP) resulted in a significant reduction in conductive losses while improving their impedance matching. The 750 CMP over 300 mesh sieved had the strongest MA properties of −53 dB at 3.49 GHz within 5.5 mm. Moreover, the prepared CMPs were multi-layer compounded and optimized by CST microwave studio. The synergistic effect derived from the improved impedance matching and the enhanced interfacial polarization resulted in significant reflection loss in multi-layer CMP. Overall, these findings lead to the systematically regulation of carbon-based materials for MA, showing an attractive application prospect for the preparation of high-performance MA materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Guiyang Xian,Ximing Zhang,Zhaolin Zhu,Yan Wang,Chongmei Wu,Yin Liu,Zhenying Liu,Xianglong Wan,Konghu Tian,Lingbing Kong
The excellent electromagnetic wave (EMW) absorption performance of metal organic frameworks (MOFs) has attracted a lot of attention. In this work, zeolitic imidazolate framework-67 (ZIF-67) was synthesized hydrothermally using 2-methylimidazole (2-mIm) as the organic ligand, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) as the cobalt source and methanol (MeOH) as the organic solvent . The ZIF-67 was etched with cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O), leading to rhombic dodecahedron Ce–Co/C composites with porous hollow structure after thermal annealing. In addition, the effect of the content of Ce(NO 3 ) 3 ·6H 2 O on EMW absorption performance of the Ce–Co/C composites was studied. Specifically, the sample Ce–Co/C-2 (Ce(NO 3 ) 3 ·6H 2 O): (ZIF-67 = 1:2) showed optimal EMW performance. For the Ce–Co/C-2 based composite with a filling ratio of 45 wt%, a RL min reached −64.67 dB at 11.12 GHz with a thickness of 2.21 mm. The promising EMW absorption performance of the porous hollow structure was attributed to its large specific surface area and massive defects, multiple reflection/scattering, improved impedance matching and increased dielectric loss. This work provides a reference improve EMW absorption performance of MOF materials through regulating their microstructures.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Tianping Wang,Zhen Zhang,Xiangnan Wang,Weiwen Wang,Tian Ma,Xikui Liu
Highly effective electrocatalysts are of vital importance for advanced applications. Here we show that fully π-conjugated dense topological salophen organic frameworks with atomic dispersed tetradentate cobalt sites in-situ growth on Kejtenblack are high-efficiency and durable electrocatalyst for the oxygen reduction, with a remarkable half-wave potential of 0.959 V which surpassing that of benchmark Pt/C catalyst, and is among the highest of reported single atom electrocatalysts. The electron transfer number was 3.92–3.99 and the yield of peroxide remains below 4% in 0.40–0.95 V. When employed as a cathode electrocatalyst for zinc-air batteries, it showed a high open-circuit voltage (1.5558 V) and maximum power density (178 mWcm −2 ) and high specific capacity (804 mAhg zn −1 ). The work reported here revealed that tailoring the active centers, conjugated structures, building blocks and topologies at atomic level could synergistically enhance the ORR activity which are highly valuable for zinc–air batteries and fuel cells.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Zihao Ma,Ying Han,Xinyue Xing,Hongwei Zhu,Qingyu Wang,Xing Wang
As a novel nanoporous carbon material with high porosity, large specific surface area, excellent electrical conductivity and high temperature resistance, carbon aerogels have broad application prospects in the fields of catalyst carriers, energy storage and adsorption materials. In this work, the hydrophobic micro-convex rough interface cellulose carbon aerogels (CCAs) were fabricated via carbonization of cellulose-lithium bromide (LiBr) molten salt hydrate gelled system. The prepared CCAs shows a low density (0.016–0.023 g/cm 3 ), high porosity (98.9–99.2 %), superior hydrophobicity (water contact angle over 135°) and excellent absorption of different oils and organic solvents . The absorption ability of CCAs 1.0-T800 for different oils and organic solvents can be 25–55 times its own weight. More importantly, the CCAs adsorbent can be reused by simple absorption/distillation method and still kept high-efficiency oil absorption capacity and excellent hydrophobicity after 5 absorption/elution cycles, displaying recyclability and robust stability. This study provides a green and facile way to fabrication of cellulose II carbon aerogels for application in spilled oil recovery, and exhibited highly promising as an economical, efficient and safe adsorbent for wastewater treatment .
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RENEWABLE ENERGY
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2022
·
IF 8.634
Laiquan Lv,Jiankang Wang,Mengting Ji,Yize Zhang,Shengyao Huang,Kefa Cen,Hao Zhou
In this article, waste phoenix leaf biochar was introduced into three most used organic phase change materials (PCMs) to prepare shape-stable composite PCMs by the vacuum impregnation method. The encapsulation capacity and encapsulation efficiency of steam activated biochar for paraffin, stearic acid, and polyethylene glycol were 59.28% and 49.14%, 63.03% and 57.62%, 71.38% and 46.84%, respectively, which was related to the mechanisms of biochar encapsulated organic PCMs. The dominant mechanisms of biochar encapsulated organic PCMs are summarized as pore-filling, hydrogen-bonding, hydrophobic interaction between biochar and PCMs, and other potential mechanisms. Influence degree η was introduced to illustrate the effect of biochar on organic PCMs, 16.56%, 8.72%, and 35.75% for steam activated biochar on paraffin, stearic acid, and polyethylene glycol. In addition, compared with original PCMs, the thermal conductivity of biochar-based composite PCMs first decreased and then increased with the increase of biochar pyrolysis temperature. Moreover, biochar-based composite PCMs had better thermal stability, concerned with the dominant mechanisms of biochar encapsulated organic PCMs. Therefore, biochar-based composite PCMs proposed in this study expand the application of biochar and organic PCMs in thermal energy storage , building energy conservation , solar energy utilization, and battery thermal management system .
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