Science China-Materials
·
2022
·Vol. 65
·期 10
·2665-2674
·
IF 8.64
Zhou Ya-Nan,Wang Feng-Ge,Zhen Yi-Nuo,Nan Jun,Dong Bin,Chai Yong-Ming
The correlation between crystal facets and electronic configurations of perovskite is closely related to the intrinsic activity for water splitting. Herein, we proposed a unique molten-salt method (MSM) to manipulate the electronic properties of LaCoO 3 by fine-tuning its crystal facet and atomic doping. LaCoO 3 samples with oriented (110) (LCO (110)) and (111) (LCO (111)) facets were motivated by a capping agent (Sr 2+ ). Compared with the LCO (111) plane, the LCO (110) and Sr-doped LCO (111) (LSCO (111)) planes possessed higher O 2p positions, stronger Co 3d–O 2p covalencies, and higher Co spin states by inducing CoO 6 distortion, thus leading to superior oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances. Specifically, the overpotentials at 10 mA cm −2 were 299, 322, and 289 mV for LCO (110), LCO (111), and LSCO (111), respectively. In addition, the (110) crystal facet and Sr substitution bestowed enhanced stability on LaCoO 3 due to the strengthened Co–O bonding. The present work enlightens new avenues of regulating electronic properties by crystal facet engineering and atom doping and provides a valuable reference for the electron structure-electrocatalytic activity connection for OER and HER.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·12002-12015
·
IF 2.779
Wang Wenwei,Hu Yongcai,Li Liangjie,Zeng Jinling,Yao Yingbang
In this study, the contents of ethyl cellulose (EC) as thickener in organic vehicle, which also acts as a binder, was examined using various control experiments; dibutyl phthalate (DBP) and dioctyl phthalate (DOP) were used as plasticizers, and acrylic resin (AR) was used as the thixotropic agent. In addition to thixotropic index, Bigham and Casson yield stress models were used for simulation, and the organic vehicle was dynamically simulated via the three interval thixotropy test; the viscosity recovery of the organic vehicle was investigated on the removal of shear stress. When the contents of the plasticizers, DBP and DOP, were 4 wt% and 6 wt%, respectively, the content of the thickener, EC, was 12 wt% and that of the thixotropic agent, AR, was 2 wt%, the comprehensive performance of the organic vehicle was greatly improved, especially in terms of thixotropy and recovery behavior. Our results demonstrate that the current organic vehicle is promising for the application of silver pastes used as inner electrodes in low-temperature co-fired ceramic (LTCC).
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Friction
·
2022
·Vol. 10
·期 11
·1824-1837
·
IF 4.924
Liu Shutian,Dong Conglin,Yuan Chengqing,Bai Xiuqin
Natural materials tend to exhibit excellent performance in the engineering field because of their structure and special functions. A natural red willow, called natural porous wood material (NPWM), was found, and wear tests were conducted to determine its potential as an oil-impregnated material by utilizing its special porous structure. Fluorination treatment was adopted to improve the NPWM properties for absorbing and storing lubricating oil. The different contributions of soaking and fluorination-soaking treatments on the tribological properties of NPWMs and their respective mechanism of effect were revealed. The results showed that the fluorination-soaking treatment helped absorb and store sufficient lubricating oil in the NPWM porous structure; therefore, more lubricating oil would be squeezed out and function as a tribol-film between contacting surfaces during the friction process, thus ultimately contributing to stable and smooth wear responses even under prolong friction. However, the formation of an oil-in-water emulsion, caused by the buoyancy effect, destroyed the oil films on the worn NPWM surface in a water environment, resulting in higher coefficients of friction (COFs) under water conditions than under dry friction, even after the fluorination-soaking treatment. The knowledge gained herein could not only verify the potential of NPWM as an excellent oil-impregnated material in the engineering field but also provide a new methodology for the design of artificial porous materials with stable and smooth friction processes.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 13
·7056-7067
·
IF 4.682
Guan Meng,Xuan Yang,Gao Yating,Liu Yining,Zhang Shubiao
Bacterial infections are closely associated with tumor growth and metastasis. Bacteriostasis can not only inhibit the growth and metastasis of tumors during their early diagnosis and treatment but also prevent bacterial infections after recovery. In this study, we synthesized Ag@GQD which consisted of nitrogen-doped graphene quantum dots (N-GQD) wrapped around Ag NPs through the photocatalytic reduction method. Multifunctional nanoprobes (Ag/DOX@GQD) were obtained by doxorubicin (DOX) loading. Ag@GQD exhibited high stability, low cytotoxicity, and good photoacoustic imaging performance. The effective photothermal performance of Ag@GQD enabled us to achieve the controlled release of DOX from probes using near-infrared light and pH response during the treatment of tumors using chemo-photothermal combination therapy. Results from cell-based experiments revealed that combination therapy was superior to single-drug therapy. Besides, Ag@GQD could effectively kill Staphylococcus aureus and Escherichia coli and can be expected to inhibit the growth and metastasis of tumors caused by bacteria and in reducing bacterial infections after recovery.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5645-5657
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IF 4.682
Ma Meng,Wang Xinpeng,Liu Kai,Chen Si,Shi Yanqin,He Huiwen,Wang Xu
Preparing poly(lactic acid) (PLA) composites with toughness and flame retardancy simultaneously is a challenge that many researchers faced. In this paper, flame-retardant and toughened PLA composites were prepared by reactive blending with in-situ formed polyurethane as the toughening phase and ammonium polyphosphate (APP) as the flame retardant. By adding glycerin as a cross-linking agent, the dropping behavior of the composites during combustion is reduced, and the toughness is greatly improved. Compared with the blended composites without the cross-linking agent, the tensile strengths of the composites with the cross-linking degree of 10% are increased by 16%, and the impact strength is increased by 11 times. The composites with 5% APP and 10% cross-linking degree had balanced performance, the vertical combustion can reach V-2 level, and the elongation at break is about 200%. The research provides a simple method to fabricate flame retardant and degradable PLA-based composites with simultaneously enhanced mechanical properties. Graphical abstract
Compared with linear polyurethane, the PLA composite material toughened by cross-linked polyurethane not only had a higher elongation at break but also decreased the droplet during the combustion process.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·7349-7356
·
IF 2.779
Zhou Xin,Tong Xuan,Li Xiaolong,Min Yonggang,Qian Yannan
To balance the carrier injection, adjusting the thickness of PEDOT:PSS through a simple water diluting was a feasible strategy to improve the efficiency of CsPbBrI 2 perovskite quantum dots light-emitting diode (PeLED). CsPbBrI 2 perovskite quantum dots (PeQDs) with a uniform and monodisperse cubic phase exhibited a red light at 649 nm and with CIE of (0.697, 0.302). Based on PEDOT:PSS film with the thickness of 40 nm, a CsPbBrI 2 PeLED displayed 4.3-fold external quantum efficiency improvement up to 3.44%, and 22.3-fold enhancement in luminance, which was attributed to an effective hole transport and an increased electrical conductivity.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 7
·2919-2927
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IF 4.705
Wang Zhi-Ke,Li Ting-Ting,Peng Hao-Kai,Ren Hai-Tao,Lou Ching-Wen,Lin Jia-Horng
In this study, a hydrogel adsorbent was successfully synthesized using hydroxyapatite/acrylamide/β-cyclodextrin to adsorb heavy metal ions and dyes in water. In the study, different contents of hydroxyapatite were added to the hydrogel, and the mechanical properties and adsorption properties of the material were studied. Results showed that the compressive strength of the hydrogel added with hydroxyapatite increased by 37.1%. The adsorption isotherm model demonstrated that the maximum adsorption capacity was 300 mg/g. In addition, the preparation process of the composite hydrogel was simple and could be used at a low pH for multiple times. Therefore, the material is of great significance to the treatment of pollutants.
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FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 5
·1225-1234
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IF 2.347
Li Siqi,Yin Jing,Xu Lan
As biomaterials with excellent biocompatibility, biodegradation and low toxicity, poly(ε-caprolactone) (PCL) and poly(lactic-co-glycolic acid) (PLGA) are extensively applied as wound dressing and surgical suture in biomedical field. In this paper, an oblique section free surface electrospinning (OSFSE) apparatus was utilized to prepare high-quality and high-output ZnO/PLGA/PCL nanofiber membranes (NFMs) for antibacterial materials, which could significantly increase the production of ZnO/PLGA/PCL NFMs from 0.01–0.1 g/h of traditional electrospinning to 30.84 g/h of OSFSE. The influences of the weight proportion of PLGA and PCL on the viscosity and conductivity of electrospinning solutions along with the yield, morphology and wettability of PLGA/PCL NFMs were researched, and the optimum weight ratio of 6:4 was determined. Then the effects of ZnO contents on the electrospinning solution properties as well as the yield, morphology, structure, wettability, mechanical property and antibacterial performance of ZnO/PLGA/PCL NFMs with the optimal ratio of PLGA and PCL were studied. The results illustrated that additive nano-ZnO could improve markedly the antibacterial effect of NFMs, and the NFMs with 3 wt% nano-ZnO had excellent antibacterial effect on Escherichia coli (95.3 %) and Staphylococcus aureus (95.7 %).
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Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
·
IF 23.655
Shang Wenshuo,Li Qiang,Jiang Fuyi,Huang Bingkun,Song Jisheng,Yun Shan,Liu Xuan,Kimura Hideo,Liu Jianjun,Kang Litao
Highlights
High-performance Zn||I 2 batteries were established by coating zeolite protecting layers.
The Zn 2+ -conductive layer suppresses I 3 − shuttling, Zn corrosion/dendrite growth.
The Zeolite-Zn||I 2 batteries achieve long lifespan (91.92% capacity retention after 5600 cycles), high coulombic efficiencies (99.76% in average) and large capacity (203–196 mAh g −1 at 0.2 A g −1 ) simultaneously.
Abstract The intrinsically safe Zn||I 2 battery, one of the leading candidates aiming to replace traditional Pb-acid batteries, is still seriously suffering from short shelf and cycling lifespan, due to the uncontrolled I 3 − -shuttling and dynamic parasitic reactions on Zn anodes. Considering the fact that almost all these detrimental processes terminate on the surfaces of Zn anodes, modifying Zn anodes’ surface with protecting layers should be one of the most straightforward and thorough approaches to restrain these processes. Herein, a facile zeolite-based cation-exchange protecting layer is designed to comprehensively suppress the unfavored parasitic reactions on the Zn anodes. The negatively-charged cavities in the zeolite lattice provide highly accessible migration channels for Zn 2+ , while blocking anions and electrolyte from passing through. This low-cost cation-exchange protecting layer can simultaneously suppress self-discharge, anode corrosion/passivation, and Zn dendrite growth, awarding the Zn||I 2 batteries with ultra-long cycle life (91.92% capacity retention after 5600 cycles at 2 A g −1 ), high coulombic efficiencies (99.76% in average) and large capacity (203–196 mAh g −1 at 0.2 A g −1 ). This work provides a highly affordable approach for the construction of high-performance Zn-I 2 aqueous batteries.
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高影响因子
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2022
·Vol. 38
·期 6
·1-10
·
IF 4.253
Liang YaoYao,Luo Juan,Yang Chenhao,Guo Shuning,Zhang Bowen,Chen Fengqianrui,Su Kairui,Zhang Yulong,Dong Yi,Wang Zhihao,Fu Hongda,Sui Guangchao,Wang Pengchao
Hydroxy-mandelic acid (HMA) is widely applied in pharmaceuticals, food and cosmetics. In this study, we aimed to develop an allosteric transcription factors (aTFs) based biosensor for HMA. PobR, an aTF for HMA analog 4-hydroxybenzoic acid, was used to alter its selectivity and create novel aTFs responsive to HMA by directed evolution. We established a PobR mutant library with a capacity of 550,000 mutants using error-prone PCR and Megawhop PCR. Through our screening, two mutants were obtained with responsiveness to HMA. Analysis of each missense mutation indicating residues 122–126 were involved in its PobR ligand specificity. These results showed the effectiveness of directed evolution in switching the ligand specificity of a biosensor and improving HMA production.
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高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·1852-1864
·
IF 11.806
Zhang Feng,Lian Mengying,Alhadhrami A.,Huang Mina,Li Bin,Mersal Gaber A. M.,Ibrahim Mohamed M.,Xu Miaojun
Enzyme immobilization technique has a broad application prospect in the area of biotechnology, biochemistry, and environmental remediation. In this study, the composite hydrogel consisting of dopamine functionalized cellulose nanofiber and alginate was fabricated for immobilization of laccase. Infrared spectra, scanning electron micrographs, and energy dispersive X-ray analysis demonstrated that the laccase molecules were covalently immobilized onto the surface of composite hydrogel. The immobilized laccase exhibited the highest enzymatic activity about 462 U·g −1 . Compared with free laccase, the pH, temperature, and storage stabilities of immobilized laccase were improved dramatically. Moreover, the immobilized enzyme can be easily separated from reaction system and reused. It retained 79.6% of its initial activity after 14 cycles of operation. Immobilized laccase was utilized for efficient degradation of bisphenol A (BPA) from polluted water, and the affecting factors on BPA removal efficiency were analyzed. Greater than 82% of BPA was removed under optimum conditions. A small amount of ABTS was added into BPA degradation; the removal efficiency had reached up to 98.7%. Results indicated that the immobilized laccase has great potential for industrial applications. Graphical abstract
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BMC CANCER
·
2022
·Vol. 22
·期 1
·1-9
·
IF 4.638
Chen Zibo,Yuan Tao,Yan Fangjie,Ye Song,Xie Qin,Zhang Bo,Lin Nengmin,He Qiaojun,Yang Bo,Zhu Hong
Background Hepatocellular carcinoma (HCC) is one of the leading causes of cancer-related deaths worldwide. Sorafenib is the first-line treatment for advanced HCC, but the anti-cancer effects remain to be improved as indicated by its low response rates and failure to prolong the progression-free survival (PFS). Thus, it is urgent to explore approaches to improve the clinical outcome.Materials and methodsThe effect of Sorafenib in HCC was analyzed by SRB (sulforhodamine B) assay in normoxia and hypoxia, respectively. The different dose combination effect of CT707 and sorafenib was analyzed by SRB assay in hypoxia. Flow cytometry assay was used to detect the cell apoptosis rate with CT707 and sorafenib treatment in hypoxia. Western blotting was used to detect the expression levels of apoptosis -related proteins and the mechanism of CT707 overcome the resistance of sorafenib in hypoxia.Results Our study showed that the characteristic intratumor hypoxia of advanced HCC is one of the major factors which mediated the drug resistance towards sorafenib in HCC. And CT-707, a novel multi-kinase inhibitor, could sensitize the hypoxic HCC cells towards sorafenib. Further studies showed that CT-707 abolished the nuclear translocation of Yes Associate-Protein (YAP), which has been demonstrated as one of mechanism of hypoxia-mediated sorafenib-resistance in HCC.Conclusion sOverall, this study not only favors the development of this novel multi-kinase inhibitor CT-707 as a therapeutic agent against HCC, but also provides a potential strategy to overcome the hypoxia-mediated resistance to sorafenib in HCC patients.
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