Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Wentao Shi,Zhijia Shen,Lu Bian,Yan Gao,Yiqing Wu,Feifei Zhao,Hong Tang,Xiaojie Lu
3,4-Dihydroxyphenylalanine (DOPA) is believed to play an essential role in the solidification and adhesion of liquid mussel adhesives; this thin polymer layer very tightly adheres to the surface of scaffolds, making it stable enough to prevent it from being peeled off. Fascinatingly, the deposition of DOPA on various types of surfaces via the self-polymerization of DOPA under alkaline conditions is a simple approach for creating biomimetic coatings. In this study, DOPA derivatives were used as monomers to form primary coatings on polycaprolactone (PCL) surfaces. After that, a second chemical crosslinking method was utilized to graft alendronate (AL) on the DOPA coatings via genipin (GP) crosslinking ( [email protected] ). X-ray photoelectron spectroscopy, Fourier transform infrared reflection and scanning electron microscopy analyses indicated that AL was distributed homogeneously on the surface of PCL. This new organic–inorganic hybridized coating could support EMSC growth and osteogenic differentiation. Additionally, animal studies were also performed to verify the function of [email protected] in promoting osteogenesis. The method is simple, cheap and highly efficient, which makes it very convenient to apply on a large scale.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Yuhang Wang,Guangxin Fan,Dafeng Zhang,Yanping Fan,Baozhong Liu
The enhanced effect of metal catalysts is crucial to achieve advanced performance of hydrogen storage system. Rational design of catalysts with superior catalytic activity is significant to regulate the re-/hydrogenation kinetics of MgH 2 . Herein, Ti 3 C 2 -supported praseodymium(III) fluoride (PrF 3 ) nanoparticles (PrF 3 /Ti 3 C 2 ) composite was prepared by hydrothermal method , which exhibited superior catalytic activity toward hydrogen storage of MgH 2 . The onset temperature of dehydrogenation was reduced to 180 °C after adding 5 wt% PrF 3 /Ti 3 C 2 , corresponding to a reduction of 107 °C compared with pristine MgH 2 . About 7.0 wt% hydrogen was rapidly desorbed within 3 min at 260 °C and 6.6 wt% hydrogen was absorbed within 36 s at 200 °C for MgH 2 -5 wt% PrF 3 /Ti 3 C 2 . Moreover, MgH 2 -5 wt% PrF 3 /Ti 3 C 2 exhibited an excellent capacity retention of 92.5% even after 10 cycles. Experimental results reveal that the electron transfer among Ti-species (Ti 0 , Ti 2+ , and Ti 3+ ) occurred due to the striking enhanced effect of PrF 3 on Ti 3 C 2 MXene during the reaction process, and the synergistic action between Ti-species and PrF 3 are responsible for the markedly enhanced hydrogen storage properties of MgH 2 . This study is helpful to the design and optimization of hydrogen storage materials for mobile application.
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高影响因子
INTERMETALLICS
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2022
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IF 4.075
Chengyi Xu,Xiaoping Cai,Xinyang Jiao,Yang Yu,Xiaohong Wang,Jianzhong Wang,Lu Zhu,Peizhong Feng
Porous CoAl 3 is a candidate material in the field of catalytic due to its high porosity, good thermostability and quasicrystal structure. However, its rapid preparation are still a challenge, and the oxidation resistance need to be further investigated. In this work, we have rapidly prepared porous CoAl 3 by thermal explosion (TE) reaction and studied its oxidation process . The results show that two exothermic peaks at 616 °C and 646 °C, corresponding to the solid-phase diffusion and TE reaction, respectively. The heat released from the two reactions led to the expansion of the compact, which reached a maximum of 104% at 800 °C, and the corresponding open porosity reached at 53%. The pore sources include the original pores during the green compact pressing process, the Kirkendall pores generated by the solid-phase diffusion process and the in-situ pores generated by the Al consumption after the TE occurs. The cyclic oxidation of porous CoAl 3 at 700 °C for 130 h only increased the weight by 1.52%, forming a continuous protective oxide film on the surface of the skeleton. It has been found that porous CoAl 3 can combine the oxidation resistance of Co–Al monoliths alloys and the high porosity of porous materials, which have potential applications in the field of catalysis such as methanation at 600–700 °C.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qingyu Wang,Xiaorui Liu,Haozhi Wang,Yuanhao Shen,Zequan Zhao,Cheng Zhong,Wenbin Hu
Zn–Ni battery is prospective green energy storage device. However, Zn(OH) 4 2– , the dissolved product of ZnO in the electrolyte, redistributes during the cycle, leading to the shape changing of the anode. This issue severely limits the lifespan of zinc anodes. Despite the success in improving the electrochemical performances of zinc anode via adding Ti 4 O 7 additive, the important mechanism of such modified anode has not been well understood. In addition, the aluminothermic reduction is facile and energy-saving. But the application of Ti 4 O 7 synthesized by this method in Zn–Ni batteries has not been studied. Herein, Ti 4 O 7 synthesized by facile and rapid aluminothermic reduction was applied to alkaline zinc anode. In subsequent electrochemical tests, the discharge capacity and cyclic performance of the zinc-nickel battery was significantly improved by adding as-prepared Ti 4 O 7 particles. At a high discharge current of 2.5 A (34.54 mA cm −2 ), the anode modified by Ti 4 O 7 delivered higher discharge capacity of 364 mAh g −1 , in contrast to the 283 mAh g −1 of pristine anode. Even at ultra-high discharge current of 10 A (138.16 mA cm −2 ), the battery operated stably for 480 cycles. Besides, the mechanism of Ti 4 O 7 modifying anode was studied in-depth by a variety of characterizations and density functional theory (DFT) calculations. We discovered that Ti 4 O 7 simultaneously regulates the distribution of electrons on the anode and Zn(OH) 4 2– in the electrolyte, contributing to forming uniform zinc anode during cycling.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 103
·期 1
·125-138
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IF 2.606
Ma Yunzhu,Peng Shaoheng,Liu Wensheng,Yao Shuwei,Wang Juan
Controlling the density and the nanograin size is challenging but essential to prepare continuous alumina fibers with excellent performance. In this study, the continuous alumina fibers were prepared using the sol-gel method. The fibers calcined under different conditions were characterized to reveal the effect of calcining conditions on the fiber microstructure evolution. The results show that the phase transformation from amorphous Al 2 O 3 to γ-Al 2 O 3 and then to α-Al 2 O 3 takes place during the calcining process. The fiber, prepared using a single-step calcining method, cannot obtain a fully dense and nanocrystal microstructure through optimizing the calcination conditions. Thus, a novel two-step calcining process was proposed, through which an almost fully dense α-Al 2 O 3 fiber with an average grain size of ~150 nm was prepared and the tensile strength of fibers reaches 2.2 GPa. Based on the results, the effect mechanism of residual organics, phase transformation, densifying, and grain growth on the fiber microstructure evolution was discussed in depth.
Graphical abstract
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Dong Huang,Qianli Liu,Peng Zhang,Chong Ye,Fei Han,Hongbo Liu,Zhihai Feng,Shipeng Zhu,Zhen Fan,Jinshui Liu,Hao Wang
A two directional high thermal conductive carbon fiber reinforced aluminum matrix composite with low interface damage is prepared by a vacuum hot-pressure diffusion method using the mesophase-pitch-based carbon fiber (CF MP ) cloth as fast heat conduction channels. The fiber/matrix interface is composed of an amorphous gradient transition layer between aluminum matrix and CF MP rather than Al 4 C 3 interface phase , thus endowing the continuous heat conduction channels in the composite. The composites deliver the high thermal conductivity of 305.5 W∙m −1 ∙K −1 in the X (Y) direction and the low volume density of only 2.53 g∙cm −3 when the fiber volume fraction reaches 30 vol%. The high thermal conductivity of the composite is attributed to the highly oriented fast heat transfer effect of the CF MP , the isotropic heat transfer effect of the aluminum matrix and the low-damage CF MP /aluminum interface. This study opens a new avenue to design and select the high thermal conductivity and lightweight thermal management materials for the aerospace field.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Jiahao Yang,Ruiqi Ma,Mingming Zhu,Yilian Xiong,Jiahui Shi,Xiaohong Li,Haolin Li,Jianjun Chen
This study reports on the preparation and mechanical properties of a novel SiC nf /SiC composite. The single crystal SiC nanofiber(SiC nf ) reinforced SiC ceramic matrix composites (CMC) were successfully fabricated by hot pressing the mixture of β -SiC powders, SiC nf and Al–B–C powder. The effects of SiC nf mass fraction as well as the hot-pressing temperature on the microstructure and mechanical properties of SiC nf /SiC CMC were systematically investigated. The results demonstrated that the 15 wt% SiC nf /SiC CMC obtained by hot pressing (HP) at 1850 °C with 30 MPa for 60 min possessed the maximum flexural strength and fracture toughness of 678.2 MPa and 8.33 MPa m 1/2 , respectively. The nanofibers pull out, nanofibers bridging and cracks deflection were found by scanning electron microscopy, which are believed can strengthen and toughen the SiC nf /SiC CMC via consuming plenty of the fracture energy. Besides, although the relative density of the prepared SiC nf /SiC CMC further increased with the sintering temperature rose to 1900 °C, the further coarsend composites grains results in the deterioration of the mechanical properties for the obtained composites compared to 1850 °C.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2022
·Vol. 147
·期 16
·8657-8666
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IF 4.755
Yan Tao,Ren Hui,Cui Qingzhong,Ou Yapeng,Guan Fayang
The interfacial reaction of nano-aluminum (nAl) and fluoropolymer was evaluated using nAl@Viton composite under slow and rapid heating rates. The results under slow heating rates indicate that nAl@Viton composites reacted in several stages at 100–1000 °C. The oxide shell of nAl underwent a pre-ignition reaction with Viton before Viton decomposition, followed by the reaction of nAl with the products from Viton decomposition, and defluorination of aluminum fluoride. Temperature jump experiments were used to confirm the occurrence of interfacial reactions between nAl particles with the products produced by Viton decomposition, and the gaseous products of nAl@Viton during the reactions were investigated via online gas chromatography/mass spectrometry. Results show a direct correlation between the nAl particles and the relative abundance of products. The initial decomposition products of Viton would be induced to form more cyclic hydrocarbon by the fluorination of nAl with gaseous fluorocarbons and hydrogen fluoride released from Viton decomposition. Fluorination yields heat feedback to the reactive surface, thus providing the main advantage of aluminum–fluoropolymer reactive system for energy release.
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高影响因子
Defence Technology
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2022
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IF 4.035
Ya-ru Li,Hui Ren,Xin-zhou Wu,Hui-xin Wang,Xi-long Yu
Aluminum (Al) particles are good fuel additives to improve the energy output performances of explosives. Under detonation environment, reaction delay of Al particles plays a key role in the energy release efficiency. Up to date, reaction delay of Al particles is still limited by the efficiency of mass and heat transfer from oxidizers to Al particles. To address this issue, a homogeneous fuel-oxidizer assembly has recently become a promising strategy. In this work, oxidizer-activated Al fuel particles (ALG) were prepared with glycidyl azide polymer (GAP) as the oxidizer. The ALG was in uniform spherical shape and core-shell structure with shell layer of around 5 nm which was observed by scanning electron microscope and transmission electron microscope. The localized nanoscale mid-IR measurement detected the uniform distribution of characteristic absorption bond of GAP in the shell layer which confirmed the homogenous fuel-oxidizer structure of ALG. A thermal gravimetric analysis of ALG at ultrafast heating rate of 1000 °C/min under argon atmosphere was conducted. The decomposition of GAP finished much earlier than that of GAP at heating rate of 10 °C/min. Under ultrafast high laser fluence, the reaction response of ALG was characterized and compared with that of micro-sized Al (μAl). With the increase of laser energy, the propagation distance of the shock wave increased. However, the velocity histories were nearly the same when energies were lower than 299 mJ or higher than 706 mJ. The propagation distance of the shock wave for ALG was 0.5 mm larger than that for μAl at 2.1 μs. The underwater explosion showed the peak pressure and the shock wave energy of the ALG-based explosive were both higher than those of the μAl-based explosive at 2.5 m. This study shows the feasibility to improve the energy release of Al-based explosives via using the oxidizer-activated Al fuel particles with energetic polymer as the oxidizer.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 3
·1073-1080
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IF 2.961
Han Jia-Jun,Guo Ao-Ran,Wang Yan-Fang
Polyaniline (PANI) was synthesized by adsorption double oxidizer method, and then reduced with N 2 H 4 ·H 2 O (r-PANI), doped with HClO 4 (d-PANI). PANI with different states was combined with lithium iron phosphate (LiFePO 4 ) in water-based slurry to form PANI/LFP composites. Some physical characterization methods (Fourier transform infrared spectroscopy analysis, scanning electron microscope) were used to analyze the morphology and structure of the composites. The electrochemical properties were characterized by cyclic voltammetry, impedance spectroscopy, galvanostatic charge/discharge, and rate capability. The specific capacity of the r-PANI/LFP composite reached 154 mAh/g, which was 4.1% higher than that of pure LFP, and the coulombic efficiency of the battery was close to 100%. Under the higher discharge rate conditions, the r-PANI/LFP composite still released a good reversible capacity. Moreover, the cyclability and rate capability of the r-PANI/LFP composites are better than that of pure LFP.
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高影响因子
FUEL
·
2022
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IF 8.035
Min Zhong,Pengju Yang,Bo Hou,Ming Xia,Jungang Wang
The main requirement for Co-based catalysts in Fischer-Tropsch synthesis (FTS) is to efficiently convert syngas (H 2 +CO) into long-chain hydrocarbons (C 5+ ). Since the formation of long-chain hydrocarbons (C 5+ ) is thermodynamically favored at low temperatures, it is desirable to develop efficient catalytic systems that can allow working at a relatively low reaction temperature. Herein, the Al 2 O 3 /Al composite has been used as support for the Co-based catalysts. The catalytic performance of Co/Al 2 O 3 /Al catalysts in FTS can be regulated by varying the Al 2 O 3 -layer thickness. With the thickening of Al 2 O 3 -layer, the catalytic activity and selectivity toward C 5+ hydrocarbons over Co/Al 2 O 3 /Al decrease markedly, although the number of accessible Co 0 sites increases obviously. This Al 2 O 3 -thickness-dependent FTS performance can be attributed to a variation of the proportion of active species Co-AlO x -Al and less active species Co-Al 2 O 3 . On the basis of the above finding, a highly active catalyst (Co/Al-0) has been developed using commercial Al metal powers as support, which will enable the FTS process to work at a fairly low reaction temperature (below 185 °C) and maintain excellent catalytic activity. This study provides a practical but low-cost method to modulate the electronic properties of metal catalysts by using available metal powders.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
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IF 8.025
Wentao Shi,Xuan Zhang,Lu Bian,Yao Dai,Zhe Wang,Yanjun Zhou,Shuang Yu,Zhijian Zhang,Peng Zhao,Hong Tang,Qing Wang,Xiaojie Lu
Here, we evaluated osteogenic differentiation in vitro and new bone formation in vivo using an alendronate-loaded chitosan/polycaprolactone scaffold (CS/PCL) in rats with a critical-sized calvarial defect. Through the action of genipin, which has a crosslinking function, alendronate (AL) was anchored throughout the CS/PCL composite scaffold (CS/ [email protected] ) to form an AL sustained release system. We demonstrated that CS/ [email protected] scaffolds significantly enhanced the osteogenic differentiation of ectomesenchymal stem cells (EMSCs) in vitro. Additionally, we explored the possible molecular mechanism of CS/ [email protected] scaffolds in the osteogenic differentiation of EMSCs. This composite scaffold exerted two positive effects on EMSC osteogenic differentiation: 1) the CS/ [email protected] scaffold enhanced EMSC osteogenic differentiation by upregulating bone morphogenetic protein 2, interleukin 10 and laminin expression; and 2) the CS/ [email protected] scaffold promoted the osteogenic differentiation of EMSCs by activating the yes-associated protein (YAP) signaling pathway. YAP and its downstream target transglutaminase are crucial mediators in the osteogenic differentiation of EMSCs. Finally, micro-computed tomography analyses and histology results suggested that the CS/ [email protected] scaffold exhibited a superior capacity to accelerate new and mature bone formation in skull bone defects in Sprague–Dawley rats. This simple and low-cost technology may represent a promising strategy to construct an efficient delivery system to repair bone defects.
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PubMed
高影响因子
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