Materials
·
2023
·Vol. 16
·期 9
·3395
·
IF 3.4
Mingheng Mao,Shaoqiu Ke,Dingguo Tang,Xiahan Sang,Danqi He
Co magnetic films are widely used in high-frequency magnetic recording and vertical magnetic recording due to their high saturation magnetization and magnetocrystalline anisotropy. In this work, ferromagnetic Co magnetic films were prepared on copper substrate by vacuum evaporation combined with heat treatment (H2atmosphere), to investigate the impact of film thickness and annealing temperature on microstructure and magnetic properties. The results show that with the increase in annealing temperature, the Co thin film physical phase does not change significantly, the crystallinity increases, and the grain size increases, which is consistent with the results obtained from the SEM morphology map of the sample surface, leading to an increase in coercivity. By annealing experiments (atmospheric atmosphere) on Co magnetic films with and without an Al protective layer, as shown by scanning electron microscopy microscopic characterization results, it was verified that the Al layer can protect the inner Co layer from oxidation. As the film thickness increases from 10 to 300 nm, the magnetic properties of Co films change significantly. The saturation magnetization gradually increases from 0.89 to 5.21 emu/g, and the coercivity increases from 124.3 to 363.8 Oe. The remanence ratio of the 10 nm magnetic film is 0.82, which is much higher than the film remanence ratio of 0.46 at 50 nm. This is because when the thickness of the film is between 10 and 50 nm, the magnetic moments partially deviate from the in-plane direction, and the out-of-plane component reduces the film remanence ratio. This study shows that optimizing annealing temperature and film thickness can effectively control the structure and magnetic properties of Co magnetic films, which is of great significance for the development of the magnetic recording field.Keywords:magnetic films;annealing;vacuum evaporation coating;remanence ratio
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高影响因子
Small
·
2023
·Vol. 19
·期 35
·2300663
·
IF 13.3
Qing Hou,Ajuan Hu,Hongbin Ni,Zongqiang Sun,Jianing Duan,Xiaoming Xu,Jingmin Fan,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
As a holy grail in electrochemistry, both high-power and high-energy electrochemical energy storage system (EES) has always been a pursued dream. To simultaneously achieve the “both-high” EES, a rational design of structure and composition for storage materials with characteristics of battery-type and capacitor-type storage is crucial. Herein, fluorine-nitrogen co-implanted carbon tubes (FNCT) have been designed, in which plentiful active sites and expanded interlayer space have been created benefiting from the heteroatom engineering and the fluorine-nitrogen synergistic effect, thus the above two-type storage mechanism can get an optimal balance in the FNCT. The implanted fluorine heteroatoms can not only amplify interlayer spacing, but also induce the transformation of nitrogen configuration from pyrrole nitrogen to pyridine nitrogen, further promoting the activity of the carbon matrix. The extraordinary electrochemical performance as results can be witnessed for FNCT, which exhibit fast lithium-ion storage capability with a high energy density of 119.4 Wh kg −1 at an ultrahigh power density of 107.5 kW kg −1 .
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Yanan Wang,Man Wang,Honghong Sun,Kangyao Tang,Xiaoli Xi,Zuoren Nie
Oxide dispersion strengthened tungsten (ODS-W) alloys are promising plasma facing material in future fusion reactors. In this study, composite powders of W-Er 2 O 3 were prepared by co-deposition method and hydrogen reduction, and then consolidated by spark plasma sintering (SPS). Microstructure evolution during co-deposition process was investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and Fourier transform infrared spectrometer (FTIR). Also, simulation using DMol3 module in Materials Studio was carried out to understand the co-deposition mechanism. The results showed that H + of W-OH bond in white tungstic acid was replaced by Er 3+ due to coordination reaction during co-deposition process, leading to formation of ring-like chelate of (WO) n Er. This indicates that doping of Er 3+ was achieved at a molecular level. Consequently, Er 2 O 3 particles were relatively uniformly distributed in W-Er 2 O 3 alloy, and the hardness and compressive strength reached 627 ± 19 HV and 1640 ± 40 MPa, respectively.
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JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 17
·2025-2036
·
IF 3.4
Tao Li,Zhijian Liu,Yao Chen,Na Sun,Haozhou Shu,Lili Wu,Chaocan Zhang,Dong Xie
Two-component catalysts composed of tetra ( para -X substituted) phenylporphyrin aluminum (III) chloride, T ( p -X-P)PAlCl, (where X = H, F, Cl, Br, CH 3 , OCH 3 , tert -butyl), and cocatalyst bis(triphenylphosphine)imminium chloride (PPN + Cl − ), could initiate the polymerization of propylene oxide (PO). And they could react with rac -lactide, ( rac -LA), in the presence of propylene oxide (PO), to yield chains of enriched isotactic polylactide (PLA) with trace polyether segment. Also, these catalysts displayed different catalytic activity in the copolymerization of CO 2 and PO, resulting in poly(carbonate-co-ether) copolymer with different carbonate unit content (CU%). Further, these catalysts could initiate one-pot regio- and stereo- selective terpolymerization of rac -LA, CO 2 and rac -PO, resulting in multi-blocky poly(carbonate-co-lactide) with trace polyether segment. The structure of the products was verified by 1 H NMR, 13 C NMR, GPC, and DSC analysis, and it was found that variation of substitution groups in the periphery of porphyrin ligand would affect on the catalytic efficiency of ter-polymerization, and the relative polymerization reaction ratio of the ring-opening polymerization of LA (ROP) to the ring-opening copolymerization of PO and CO 2 (ROCOP), resulting in ter-polymer with different contents of PLA segment and PPC segment. However, H-T % in polycarbonate unit and P i % in polylactide unit did not vary much with the change of catalysts. Graphical
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jinjie Li,Tielan Wang,Junzeng Xue
The widespread use of disinfectants in response to the COVID-19 pandemic may increase the concentration of disinfection by-products (DBPs) in surface water, posing ecological risks. This study assessed the acute toxicity of haloacetic acids and halophenols DBPs to Pseudokirchneriella subcapitata , and evaluated the impact of environmental concentrations of DBPs on co-cultured algae communities. The results showed that after exposure to disinfection by-products, the photosynthetic pigments of Pseudokirchneriella subcapitata were significantly reduced, and the MDA content and antioxidant enzyme activity were increased. The results of the ecological risk assessment showed that the RQ values of TBAA, 2,4-DBP, and 2,6-DBP were >0.1, with medium and high ecological risks. Despite this, the three DBPs with the highest risk values had little effect on the community structure of co-cultured algae. In contrast, the disinfection by-products with low ecological risk had a greater impact on the community structure and greatly promote the growth of cyanobacteria, which may cause new ecological risks. Therefore, not only high-risk disinfection by-products need to be paid attention to, but the impact of low-risk disinfection by-products cannot be ignored.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Sen Jin,Huijuan Jing,Libo Wang,Qianku Hu,Aiguo Zhou
Mo2C MXene is a two-dimensional material, which can be applied as a co-catalyst to significantly enhance the photocatalytic performance of CdS for H2 production. To understand the effect of the synthesis process of Mo2C MXene nanosheets on the catalytic performance, in this paper, Mo2C MXene was made from Mo2Ga2C by hydrothermal etching in different etchants. Diverse cations (Li+, Na+, K+, or NH4+) in etchants resided on the surface of Mo2C MXene nanosheets. Then, the samples were used to construct CdS/Mo2C-MXene composites for photocatalytic H2 evolution. Among them, Mo2C MXene with Li+ shows the best photocatalytic H2 production rate of 22,048 μmol g–1 h–1 under visible light. The remarkable performance arises from the modification at the nanoscale of Mo2C MXene with Li+, thereby resulting in better photoabsorption behavior, high separation efficiency of photogenerated carriers, and fast charge transfer at the heterointerface. Moreover, the energy band structures explain that the changes of band gap and the position of the conductive band in the photocatalyst tuned by cations are also key to affect photocatalytic activities.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhe Li,Chun-yong Zhang,Hao-yu Wang,Lin Zhu,Hai-tao Liu,Li Shu,Ying-pin Weng
Herein, a simple hydrothermal method was used to synthesize cobalt hydroxide/nickel sulfide and cobalt foam (Co(OH) 2 /NiS@CF) composite electrode. By simply heating cobalt foam in the aqueous solution containing cobalt nitrate, nickel nitrate, and thiourea, Co(OH) 2 /NiS nano stereoscopic website was synthesized on Cobalt foam. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and electrochemical tests were used to characterize these composite electrodes. When the molar ratio of Co(NO 3 ) 2 ·6H 2 O to Thiourea of 4:5, Co(OH) 2 /NiS@CF exhibits excellent performance under these tests. The specific capacitance was 1260 F/g at 1.0 A/g. The composite electrode had 92.3% capacitance retention after 2000 charge-discharge cycles at 1.0 A/g.
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Yu Chen,Zemin Zhao,Ze Li,Jieying Jing,Wenying Li
Hydrogenation saturation of phenanthrene was an effective method to acquire high energy density fuels. It is essential to design highly active and stable hydrogenation saturated catalyst to realize the above reaction. Herein, series of Ni-Co/NiAlOx catalysts were synthesized by reducing at different temperatures. Activity evaluation showed that the catalysts reduced at 560 °C (Cat-560) possessed a phenanthrene conversion amount of 8.0 mmol·g -1 active component·h −1 and 98% perhydrophenanthrene selectivity after running 6 h under 300 °C, 5 MPa. Furthermore, it was found that Cat-560 presented superior specific activity (4.3 mmol·kg −1 ·s −1 ) and TOF (41.1 × 10 −3 s −1 ) for symmetric octahydrophenanthrene hydrogenation (the rate determining reaction), and its specific activity was 3 times as high as that of the catalysts reduced at 520 °C The excellent hydrogenation performance of Cat-560 could be attributed to its special geometric and electronic structure. Characterization indicated that the Ni 2+ in Ni-Co/NiAlO X catalyst was mainly located in the nickel aluminum spinel octahedral sites, which was beneficial to the reduction of Ni and the formation of smaller Ni particles. Moreover, it was explored that the Ni d charge density of Cat-560 catalyst was −0.12 e, which was suitable for the adsorption and activation of phenanthrene and symmetric octahydrophenanthrene.
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BIOMEDICINE & PHARMACOTHERAPY
·
2023
·
IF 7.5
Chang Liu,Xiao Guo,Yutong Chen,Meijun Zhao,Shuai Shi,Zheng Luo,Jian Song,Zhihong Zhang,Wenchuang Yang,Keyi Liu
Prolonged exposure to UV light can lead to photo-ageing of the skin. Therefore, the development and application of anti-photoaging drugs is urgent. In this study, we co-loaded apigenin (Apn) and doxycycline (Doc), a broad-spectrum inhibitor of matrix metalloproteinases (MMPs), into flexible liposomes to exert anti-photoaging effects by combating oxidative stress, anti-inflammation, reducing the activation of MMPs and preventing collagen loss. The results showed that we prepared a flexible liposome (A/ D -FLip) containing Apn and Doc. Its appearance, particle size and Zeta potential were normal and it had good encapsulation efficiency, drug loading, in vitro release and transdermal efficiency. In cellular experiments, A/ D -FLip could inhibit oxidative stress damage, reduce inflammatory factors and decrease the activation of MMPs in Human immortalized keratinocytes (HaCaT) cells; in animal experiments, A/ D -FLip could inhibit skin damage and reduce skin collagen loss by decreasing the activation of MMPs, thus inhibiting skin photoaging in mice. In conclusion, A/ D -FLip has good anti-photoaging effects and it has the potential to become an effective skin care product or drug against UV damage and skin photoaging in the future.
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高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Lu-Lu Yang,Xue-Wei Wei,Tianyu Wu,Xiaoyu Meng,Hai-Mu Ye
Isomorphism is a distinctive kind of co-crystallization behavior of random copolymers and provides opportunities to regulate the crystalline structure and performance without the loss of crystallinity. Though the intrinsic structural differentiation would induce variation of accommodation capacity in the co-crystal lattice for different co-monomeric units, subtle manipulation of isomorphism has not been realized yet. In this study, butylene adipate (BA) as the crystallizable unit is incorporated into an isomorphism system model of poly(butylene succinate-ran-butylene fumarate) (PBSF) to form the terpolymers of PBSFA, and the crystallization features are investigated. It is confirmed that part of BA (i.e., ≤20 mol %) does not hinder the isomorphism formation in the terpolymers of PBSFA but influences the accommodation capacities of the isomorphic counterparts of butylene succinate (BS) and butylene fumarate (BF). When BA with 10 mol % is copolymerized, the adoption of BS unit in isomorphism becomes less favorable in comparison to the biopolymers of PBSF, showing an increase of the defect Gibbs free energy for the co-crystal and a decrease of the accommodation ratio of BS. However, with a further lifting of the BA content to 20 mol %, the accommodation preference of BS and BF in the isomorphism lattice reverses, and BS turns into a favorable unit instead of BF. Such a transition of accommodation capacity might be due to the deterioration of intersegmental interaction caused by the third co-crystallizable unit of BA. This work directly reveals the differentiation of co-monomeric units in the isomorphic lattice and sheds light on the manipulation of isomorphism.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yonghong Wang,Kaixin Wang,Xinru Zhang,Jinping Li
Carbon molecular sieve (CMS) membranes are widely used for the separation of similar molecular kinetic diameter gas. However, their performance is limited by a large amount of discontinuous porous structures and a few adsorption affinity sites. Herein, we first prepared magnetic Co@NC@ZIF-8 nanoparticles , followed by introducing it into the polyimides matrix to design precursor membrane with vertical nanochain-like particle distribution by magnetic field induction. Afterwards, hybrid carbon molecular sieve (HCMS) membranes were prepared by pyrolyzing precursor with high-temperature under N 2 atmosphere, which had ordered microporous architecture and Co-N-C structure. Resultant HCMS membranes prepared by magnetic field induction had excellent gas separation performance, whose CO 2 , N 2 and CH 4 permeabilities were 27,050, 2614 and 622 Barrer, with CO 2 /N 2 , CO 2 /CH 4 and N 2 /CH 4 selectivities of 10.4, 43.5 and 4.2 respectively. These values far exceeded 2019 CO 2 /CH 4 and 2008 N 2 /CH 4 upper bounds as well as approached 2008 CO 2 /N 2 upper bound. The superior performance resulted from the vertically ordered nanochain-like channels for gas transport, which dramatically shortens the transport path of gas molecules to intensify shape sieving potential. Moreover, the Co-N-C structure on the wall of channels could facilitate CO 2 transport due to the π complexation. Additionally, a large quantity of nitrogen sites in the carbonized Co@NC@ZIF-8 enhance CO 2 adsorption selectivity owing to the acid-base interaction. More remarkably, after 30-day aging testing, it was found that HCMS membranes prepared by magnetic field induction had exceptional aging resistance compared to the pristine CMS membranes and one without magnetic field induction under the same aging environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Fangfang Liu,Jinan Niu,Xiuyun Chuan,Yupeng Zhao
At present, the designs of carbon nanomaterials are indispensable to fulfill the growing demand for high energy and power density of energy storage devices. Heteroatom-doped (such as B, N, O, P, S, etc) porous carbon has great potential in the application of supercapacitor (SC) electrode materials. Nitrogen-doped carbon (N-C) has displayed superior properties in SC applications, which has attracted the attention of researchers. Due to the synergistic effect between N and S atoms, the nitrogen and sulfur co-doped carbon (N/S-C) shows superior electrochemical properties compared to the nitrogen single-doped porous carbon. Therefore, the development of N/S-C as SC electrode is of great importance. In recent years, the literature on the study of N-C for SC applications has been very extensive, however, there are a limited number of review articles on N/S-C. This manuscript represents future research directions, recent developments in the preparation of N/S-C and its application in SC. Herein, the preparation and dimension structure of N/S-C were summarized. Finally, the electrochemical properties including specific capacitance (C F ), energy density (ED) and power density (PD) are critically reviewed when these N/S-C are used as SC electrodes.
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