MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-8
·
IF 6.232
Liang Pei,Cao Yu,Dong Qianmin,Wang Dan,Zhang De,Jin Shangzhong,Yu Zhi,Ye Jiaming,Zou Mingqiang
Simple and traditional hydrothermal fabrication of a novel balsam pear-shaped CuO with high SERS enhancement is presented. XRD (X-ray diffraction), SEM (scanning electronic microscopy), TEM (transmission electron microscope), HRTEM (high-resolution transmission electron microscope), UV-Vis, and Raman are adopted to ensure that this balsam pear-shaped CuO with dense nanoparticle protuberance is successfully prepared. The LOD of this CuO SERS substrate is 4.79 μg L −1 with R6G as molecular probe. By using DFT (density functional theory) calculation and FDTD (finite difference time domainmethod) simulation, both EM (electromagnetic enhancement) and CM (chemical enhancement) mechanisms are investigated, and the results show that these two-enhancement mechanisms can coexist in this balsam pear-shaped CuO. Finally, the prepared substrate has been applied for the determination of trace levels of paraquat in solution , and results show that its LOD for paraquat is 275 μg L −1 (optimum Raman band: 1646 cm −1 Raman shift), which is better than the government standard in China. A dexterous and facile way for fabrication of CuO SERS-active substrates with low cost and high performance, quite promising in detection of chemically hazardous substances and pesticide residue is provided.
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高影响因子
TRANSITION METAL CHEMISTRY
·
2020
·Vol. 45
·期 6
·413-421
·
IF 1.366
Li Lingyan,Li Lei,Li Qianqian,Shen Yiming,Pan Shangke,Pan Jianguo
Two novel tetrahedral Mn (II) halide single-crystals [(C 7 H 10 N) 2 ][MnCl 4 ] ( 1 ) and [(C 7 H 10 N) 2 ][MnBr 4 ] ( 2 ), based on pyridine ionic liquids, have been successfully prepared. Centimeter-sized single crystal 2 was grown through bottom seed-solution temperature-lowering method, while the 1 was synthesized by solvent slow evaporation. Structure elucidation results indicate that the two crystals crystallize in the different space groups of the same monoclinic system. Significantly, the solid crystal 2 is possessed of superior luminescence properties than 1 at room temperature. Excited by ultraviolet light, the 1 and 2 emit intense green emission bands derived from the Mn (II) 4 T(G) energy level. The fluorescent lifetimes are 384.43 and 187.83 μs, respectively, and quantum yields are 82% and 12%, respectively. Furthermore, under the excitation of X-ray, the 2 exhibits prominent X-ray fluorescence performance.
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CELLULOSE
·
2020
·Vol. 27
·期 6
·3013-3023
·
IF 4.21
Shen Feng,Sun Shuang,Zhang Xiao,Yang Jirui,Qiu Mo,Qi Xinhua
Abstract Direct production of the platform chemical 5-hydroxymethylfurfural (5-HMF) from cellulose is challenging due to the rigid structure of cellulose. Herein, 5-HMF was effectively obtained from cellulose with high loading concentrations (> 20 wt.%) via an Al 2 (SO 4 ) 3 -assisted mechanochemical method. The Al 2 (SO 4 ) 3 not only acted as catalyst for its Lewis and Brønsted acidity, but also assisted the disruption of the hydrogen bonds among cellulose molecules during ball milling pretreatment. The particle size and crystallinity of the cellulose greatly decreased after Al 2 (SO 4 ) 3 -assisted ball milling pretreatment. The effects of various factors, including the organic solvent, reaction temperature and time, catalyst dose, and substrate concentration, on the yield of 5-HMF from cellulose were studied. A yield of 5-HMF up to 43.5% was obtained from cellulose via the developed mechanochemical-assisted method. A 36.1% yield of 5-HMF was retained when the initial cellulose loading concentration was as high as 21.6 wt.%. The green and efficient mechanochemical-assisted method was applicable to the efficient coproduction of 5-HMF and furfural from several waste biomass feedstocks.
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JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 4
·2529-2538
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IF 1.774
Zhang Pengfei,Liu Yanxia,Chai Fengtao,Fan Yameng,Hou Aolin
Li 4 Ti 5 O 12 (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g −1 at 10 C, 145 mAh g −1 at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Pan Lun,Ai Minhua,Huang Chenyu,Yin Li,Liu Xiang,Zhang Rongrong,Wang Songbo,Jiang Zheng,Zhang Xiangwen,Zou Ji-Jun,Mi Wenbo
Photocatalysis has been regarded as a promising strategy for hydrogen production and high-value-added chemicals synthesis, in which the activity of photocatalyst depends significantly on their electronic structures, however the effect of electron spin polarization has been rarely considered. Here we report a controllable method to manipulate its electron spin polarization by tuning the concentration of Ti vacancies. The characterizations confirm the emergence of spatial spin polarization among Ti-defected TiO 2 , which promotes the efficiency of charge separation and surface reaction via the parallel alignment of electron spin orientation. Specifically, Ti 0.936 O 2 , possessing intensive spin polarization, performs 20-fold increased photocatalytic hydrogen evolution and 8-fold increased phenol photodegradation rates, compared with stoichiometric TiO 2 . Notably, we further observed the positive effect of external magnetic fields on photocatalytic activity of spin-polarized TiO 2 , attributed to the enhanced electron-spin parallel alignment. This work may create the opportunity for tailoring the spin-dependent electronic structures in metal oxides.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·469-480
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IF 5.693
Hu Peitao,Dong Shun,Yuan Fang,Li Xiutao,Hong Changqing
Due to the unique advantages including low density, good chemical stability, and superior dielectric property, carbon-based materials have been exploited as potential microwave absorbers and have become a research hotspot. Herein, a superior microwave absorbent consisting of NiCo 2 S 4 nanosheets anchored on hollow carbon spheres is successfully designed and fabricated by a low-cost and facile strategy for the first time. The obtained C/NiCo 2 S 4 composite shows a minimum reflection loss (RL min ) of −65.10 dB with a matching thickness of only 1.56 mm, and the effective absorption bandwidth (EAB) could reach up to 6.60 GHz at a thin thickness of 1.75 mm, which is a highly competitive carbon-based absorber. The existence of NiCo 2 S 4 nanosheets balances the impedance matching property and enhances the dielectric loss effectively, and the cavity structure promotes the multiple reflections of the electromagnetic wave (EMW), which increases the energy loss capacity of the material. This study provides new insight into design and modification of hollow carbon spheres and broadens their application in the field of efficient microwave absorbers. Graphical abstract
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Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 5
·4623-4634
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IF 2.431
Zhou Jia-Min,Shi Mei-Jia,Wei Xiao-Yi,Zhou Tao
In order to improve the biological activities of polysaccharides from Enteromorpha prolifra (EP), the crude EP was degraded in the presence of pectinase and glucoamylase. The reaction conditions for the hydrolysis of EP were optimized as: hydrolysis temperature 45.2 °C, total enzyme concentration 48.5 U/mL, with an activity ratio of pectinase to glucoamylase 3.4:1, pH 4.5, degradation time 3 h. In vitro antioxidant activity of the enzymatic degraded polysaccharides from E. prolifra (EEP) obtained under the optimal conditions was significantly improved when compared to that of EP. The IC 50 values of EEP to scavenge DPPH, hydroxyl and superoxide anion radicals were found to be 3.31, 3.02 and 3.90 mg/mL, respectively, while those values for EP were 19.57, 5.96 and 5.51 mg/mL, respectively. At 5 mg/mL, the ferric iron reducing power of EEP was 1.41 times higher than that of EP; the ferrous chelating ability of EEP was 89.6%, being much than that of EP (54.9%). Furthermore, EEP was found to have stronger tyrosinase inhibitory effects than EP. At 3.0 mg/mL, the inhibition rates of EEP on monophenolase and diphenolase activity of mushroom tyrosinase were measured as 32.7% and 39.1%, respectively, while those values for EP were 16.3% and 21.1%, respectively. The inhibition of EEP on diphenolase activity of mushroom tyrosinase was reversible and of competitive-uncompetitive mixed-type. EEP prepared in this study may find application in food industry and cosmetics.
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CYTOTECHNOLOGY
·
2021
·Vol. 73
·期 5
·715-726
·
IF 2.058
Xu Haiqiao,Lin Shibang,Huang Haizhou
CCL22, which could induce chondrocyte apoptosis, was identified to be overexpressed in damaged cartilage. This study was conducted with the aim of investigating the effects of CCL22 interference on chondrocyte injury. The osteoarthritis model was established by stimulating chondrocytes with LPS. The expressions of CCL22, CCR4, matrix metallopeptidase (MMP) 3, MMP9, MMP13, (a disintegrin and metalloproteinase with thrombospondin-like motifs) ADAMTS-4, collagen II and inflammatory cytokines were measured using quantitative reverse transcription PCR (RT-qPCR) and western blot. Besides, immunoprecipitation (IP) was employed to verify the binding of CCL22 and CCR4. After CCR4 was overexpressed, cell viability was observed using Cell Counting Kit-8 (CCK-8). Additionally, cell apoptosis as well as its related proteins was detected by TUNEL and western blot, respectively. ng What’s more, glycosaminoglycan (GAG) level was detected using GAG kits. CCL22 and CCR4 expression increased noticeably in LPS-stimulated ATDC5 chondrocytes. CCL22 inhibition could suppress the expression of CCR4 in LPS-induced ATDC5 cells. Likewise, CCL22 inhibition could revive the activation of LPS-induced ATDC5 cells by regulating CCR4. In addition, CCL22 knockdown alleviated inflammatory response and cell apoptosis through CCR4. Furthermore, the cartilage degradation of ADTC5 cells could be relieved by CCL22 silence via regulating CCR4. CCL22/CCR4 expression was increased in osteoarthritic cartilage injury and participated in the inflammation and cartilage degradation of chondrocytes.
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Reproductive Biology and Endocrinology
·
2021
·Vol. 19
·期 1
·1-11
·
IF 5.211
Xu Haopeng,Xia Yi,Qin Juan,Xu Jie,Li Chongyan,Wang Yan
Background Premature ovarian failure (POF) is a common disease in the field of Gynecology. Low intensity pulsed ultrasound (LIPUS) can promote tissue repair and improve function. This study was performed to determine the effects of LIPUS on granulosa cells (GCs) apoptosis and protein expression of B-cell lymphoma-2 (Bcl-2) and BCL2-Associated X (Bax) in 4-vinylcyclohexene diepoxide (VCD)-induced POF mice and investigate the mechanisms of LIPUS on ovarian function and reserve capacity.Methods The current POF mice model was administrated with VCD (160 mg/kg) by intraperitoneal injection for 15 consecutive days. The mice were divided into the POF group, LIPUS group and control group. In the LIPUS group, the right ovary of mice was treated by LIPUS (acoustic intensity was 200 mW/cm2, frequency was 0.3 MHz, and duty cycle was 20%) for 20 min, 15 consecutive days from day 16. The mice of the POF group and control group were treated without ultrasonic output. The basic observation and body weight were recorded. Hematoxylin and eosin staining (H&E staining) and enzyme-linked immunosorbent assay (ELISA) were applied to detect ovarian follicle development, ovarian morphology and sex hormone secretion. Ovarian GCs apoptosis was detected by TUNEL assay and immunohistochemistry.Results The results showed that VCD can induce estrus cycle disorder, follicular atresia, sex hormone secretion decreased and GCs apoptosis in mice to establish POF model successfully. LIPUS significantly promoted follicular development, increased sex hormone secretion, inhibited excessive follicular atresia and GCs apoptosis. The mechanism might be achieved by increasing the protein expression of Bcl-2 and decreasing the expression of Bax in ovaries.Conclusion sLIPUS can improve the POF induced by VCD. These findings have the potential to provide novel methodological foundation for the future research, which help treat POF patients in the clinic.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 8
·6073-6086
·
IF 2.87
Wang Jinyuan,Hu Haibo,Jin Jie,Cui Yanjun,Tang Jinsong
Aliphatic polycarbonates derived from carbon dioxide and epoxides are drawing increasing attention from both academic and industrial researchers due to their biodegradability and partially renewable raw material resource. Of all the aliphatic polycarbonates investigated, poly(cyclohexene carbonate) (PCHC) is recognized as highly potential candidates thanks to its high glass transition temperature ( T g ) which can bridge the shortcomings of commercialized biodegradable materials. Meanwhile, polymers with high T g require higher processing temperature during compounding and subsequent casting in mold. It is therefore necessary to investigate the property changes of PCHC during its multiple thermal processing. In this work, the effect of several thermal stabilizers on the thermal stability and mechanical properties of PCHC was studied. The results showed that end-capping by maleic anhydride is the best approach to improve the thermal stability and to maintain the mechanical properties of PCHC. The possible mechanism for improving the thermal stability of PCHC was further analyzed by Py-GC/MS and 1 H NMR. Partial in situ end-capping of PCHC could mitigate the back-biting reaction at elevated temperature and consequently improved the thermal stability.
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ARCHIVES OF VIROLOGY
·
2021
·Vol. 166
·期 9
·2443-2450
·
IF 2.574
Cui Zhanding,Wang Qian,Li Dengliang,Zhao Shihui,Zhang Qian,Tan Yuxin,Gong Qianwen,Liu Ting,Shao Jiang,Zhang Shuang,Huang Hailong,Wang Junzheng,Pei Zhihua,Dong Hao,Wang Kai,Hu Guixue,Li Zhiyong
Cats infected with feline calicivirus (FCV) often display oral ulcers and inflammation of the upper respiratory tract, which can lead to death in severe cases. Antiviral therapy is one of the most effective ways to control FCV infection. Natural compounds in Chinese herbal medicines and medicinal plants provide abundant resources for research on antiviral drugs. In this study, we found that icariin (ICA), formononetin (FMN) and caffeic acid phenethyl ester (CPAE) show low cytotoxicity towards F81 cells, that the three natural compounds have apparent antiviral effects on FCV in vitro , and that they can inhibit different FCV strains. Then, we found that ICA and FMN mainly function in the early stage of FCV infection, while CAPE can function in both the early and late stages of FCV infection. Finally, we found that ICA has an antagonistic effect on FMN and CAPE in FCV infection, and FMN has a synergistic effect with CAPE against FCV infection. Our results showed that ICA, FMN and CAPE may be potential drug candidates for FCV-induced diseases.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 34
·19075-19092
·
IF 4.22
Liu Ying,Huang Yanhui,Huang Quanfei,Li Fan,Liu Xianmiao
Due to frequent industrial wastewater discharge and oil spills, there is a need to develop sustainable and efficient absorbents and treatment methods. Herein, based on the unique microstructure of wood and functional requirements, super-hydrophobic, recyclable, and renewable wood sponges (SHWSs) with an ultralight density (35.4 mg cm −3 ) and high porosity (98.68%) were prepared from anisotropic natural balsa wood via a scalable and sustainable silanization reaction using liquid-phase deposition (LPD). The super-hydrophobicity of the SHWSs (contact angle = 159.2°) was due to the formation of polysiloxanes on the surface via silanization. The internal contact angle (CA) reached 137.2°, which was attributed to the uniformity of LPD. The SHWSs exhibited a high absorption capacity for various organic solvents and oils (23–60 g g −1 ) and reusability, allowing it to reach a contact angle of 150.8° and an absorption capacity of 52 g g −1 for CCl 4 after 50 absorption cycles. The SHWSs also showed excellent super-hydrophobicity under acidic, alkaline, and saline conditions, as well as in hot water, demonstrating their excellent durability. A continuous oil/water separation device was made by using the SHWSs, which showed a high separation efficiency, with a flux rate of up to 72.8 L h −1 g −1 . This green strategy for treating natural balsa wood with LPD provides a scalable way to produce sustainable oil/water separation materials while also developing high-value-added applications of natural balsa wood.
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危险品化学品经营许可证（带存储）