JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 147
·期 22
·12547-12559
·
IF 4.755
Nie Shi-bin,Fang Cheng-ye,Xu Yu-xuan,Dong Xiang,Yang Ji-nian,Kong Fan-bei,Han Chao
Melamine–formaldehyde resin-coated bamboo fiber (MFBF) and ammonium polyphosphate (MFAPP) were prepared, and then flame-retardant polypropylene (PP)/bamboo fiber composites based on MFBF/MFAPP were obtained by melt blending. The water resistance, flame retardant, and thermal properties of the composites were studied. The results show that MFBF and MFAPP have excellent water resistance with the water contact angles 130.85° and 119.78°, respectively. Compared with pure PP, the limit oxygen index (LOI) of the prepared composite increased from 18.5 to 25.5% with the UL-94V-0 rating. The peak heat release rate of the composite decreased from 1011.8 to 344.3 kW·m −2 and the total heat release decreased from 100.6 to 58.8 MJ·m −2 . Meanwhile, the total smoke release decreased from 1453.3 to 922.0 m 2 ·m −2 . After soaking in 70 °C water for 36 h, the composite still reached the V-0 rating in UL-94 test, demonstrating a good water resistance. This work provides an effective method to improve the water resistance and flame retardancy of PP/bamboo fiber composites. Graphical abstract Melamine–formaldehyde resin-coated bamboo fibers (MFBF) and ammonium polyphosphate (MFAPP) were prepared, then flame-retardant PP/BF composites were obtained based on MFBF/MFAPP. The results show that prepared composite exhibited excellent water resistance and flame-retardant properties.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhou Shuolin,Long Min,Wu Lu,Lei Min,Bai JunZhuo,Huang Keying,Liu XianXiang,Yin Dulin
Covalently bonded sulfamic acid on the titanate nanotubes (TNTs-N(SO 3 H)-(CH 2 ) 2 -NHSO 3 H) was designed and successfully fabricated by the post-synthesis modification method. The as-prepared catalyst was characterized by a variety of characterization techniques such as FT-IR, TEM, XRD, XPS, and TG-DTG. The catalytic activity of TNTs-N(SO 3 H)-(CH 2 ) 2 -NHSO 3 H was evaluated for the synthesis of n-butyl levulinate (BL) from levulinic acid (LA). It was found that the tube-like structure of the TNTs still maintained during the modification process, and Brønsted and Lewis acid sites can be efficiently immobilized on the TNTs. The effects of reaction factors such as reaction time, reaction temperature, and catalyst dosage on the esterification of LA were systematically studied. Under the optimal reaction conditions, a relatively high yield of BL (95.3%) was achieved for esterification of levulinic acid owing to the strong Brønsted acidic sites. Furthermore, the hybrid catalyst TNTs-N(SO 3 H)-(CH 2 ) 2 -NHSO 3 H was used at least five times without significant decrease in activity, and no leaching of the active species in hot filtration test was observed. Graphical abstract
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高影响因子
Nano Research
·
2022
·Vol. 16
·期 4
·5383-5390
·
IF 10.269
Mao Guobin,Yang Yang,Cao Shijie,Ye Silu,Li Yifang,Zhao Wei,An Hongwei,Liu Yingxia,Dai Junbiao,Ma Yingxin
The global pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus has necessitated rapid, easy-to-use, and accurate diagnostic methods to monitor the virus infection. Herein, a ratiometric fluorescence enzyme-linked immunosorbent assay (ELISA) was developed using Si-fluorescein isothiocyanate nanoparticles (FITC NPs) for detecting SARS-CoV-2 nucleocapsid (N) protein. Si-FITC NPs were prepared by a one-pot hydrothermal method using 3-aminopropyl triethoxysilane (APTES)-FITC as the Si source. This method did not need post-modification and avoided the reduction in quantum yield and stability. The p-nitrophenyl (pNP) produced by the alkaline phosphatase (ALP)-mediated hydrolysis of p-nitrophenyl phosphate (pNPP) could quench Si fluorescence in Si-FITC NPs via the inner filter effect. In ELISA, an immunocomplex was formed by the recognition of capture antibody/N protein/reporter antibody. ALP-linked secondary antibody bound to the reporter antibody and induced pNPP hydrolysis to specifically quench Si fluorescence in Si-FITC NPs. The change in fluorescence intensity ratio could be used for detecting N protein, with a wide linearity range (0.01–10.0 and 50–300 ng/mL) and low detection limit (0.002 ng/mL). The concentration of spiked SARS-CoV-2 N protein could be determined accurately in human serum. Moreover, this proposed method can accurately distinguish coronavirus disease 2019 (COVID-19) and non-COVID-19 patient samples. Therefore, this simple, sensitive, and accurate method can be applied for the early diagnosis of SARS-CoV-2 virus infection.
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PubMed
高影响因子
Nano Research
·
2022
·Vol. 16
·期 5
·6067-6075
·
IF 10.269
Ding Jieting,Guo Danyu,Hu Anqian,Yang Xianfeng,Shen Kui,Chen Liyu,Li Yingwei
The preparation of supported high-density metal nanoparticles (NPs) is of great importance to boost the performance in heterogeneous catalysis. Thermal transformation of metal-organic frameworks (MOFs) has been demonstrated as a promising route for the synthesis of supported metal NPs with high metal loadings, but it is challenge to achieve uniform metal dispersion. Here we report a strategy of “spatial isolation and dopant anchoring” to resist metal aggregation in the pyrolysis of MOFs through converting a bulk MOF into dual-heteroatom-containing flower-like MOF sheets (B/N-MOF-S). This approach can spatially isolate metal ions and increase the number of anchoring sites, thus efficiently building physical and/or chemical barriers to cooperatively prevent metal NPs from aggregation in the high-temperature transformation process. After thermolysis at 1,000 °C, the B/N-MOFS affords B,N co-doped carbon-supported Co NPs (Co/BNC) with uniform dispersion and a high Co loading of 37.3 wt.%, while untreated bulk MOFs yield much larger sizes and uneven distribution of Co NPs. The as-obtained Co/BNC exhibits excellent electrocatalytic activities in both hydrogen evolution and hydrazine oxidation reactions, and only a voltage of 0.617 V at a high current density of 100 mA·cm −2 is required when applied to a two-electrode overall hydrazine splitting electrolyzer.
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Fan Zhenglong,Liao Fan,Ji Yujin,Liu Yang,Huang Hui,Wang Dan,Yin Kui,Yang Haiwei,Ma Mengjie,Zhu Wenxiang,Wang Meng,Kang Zhenhui,Li Youyong,Shao Mingwang,Hu Zhiwei,Shao Qi
Designing well-ordered nanocrystal arrays with subnanometre distances can provide promising materials for future nanoscale applications. However, the fabrication of aligned arrays with controllable accuracy in the subnanometre range with conventional lithography, template or self-assembly strategies faces many challenges. Here, we report a two-dimensional layered metastable oxide, trigonal phase rhodium oxide (space group, P-3m1 (164)), which provides a platform from which to construct well-ordered face-centred cubic rhodium nanocrystal arrays in a hexagonal pattern with an intersurface distance of only 0.5 nm. The coupling of the well-ordered rhodium array and metastable substrate in this catalyst triggers and improves hydrogen spillover, enhancing the acidic hydrogen evolution for H 2 production, which is essential for various clean energy-related devices. The catalyst achieves a low overpotential of only 9.8 mV at a current density of −10 mA cm − 2 , a low Tafel slope of 24.0 mV dec − 1 , and high stability under a high potential (vs. RHE) of −0.4 V (current density of ~750 mA cm − 2 ). This work highlights the important role of metastable materials in the design of advanced materials to achieve high-performance catalysis.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-13
·
IF 6.408
Chen Jing,Li Shuying,Chen Ying,Yang Jiao,Dong Jianbin
Adenine (A) and guanine (G) are mainly found in deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) and play a crucial role in genetic information transfer and protein synthesis. In this study, NH 2 -MIL-53(Fe)/CS/MXene nanocomposites were prepared for detecting guanine and adenine. With high specific surface area, excellent water dispersion, and numerous active sites, MXene (transition metal carbides, nitrides, and carbonitrides) provides a good platform for loading primitive metal-organic frameworks (MOFs). At the same time, the problem of poor conductivity and dispersion of MOFs is solved. The electrochemical catalytic oxidation of adenine and guanine of NH 2 -MIL-53 (Fe)/CS/MXene nanocomposites was carried out by differential pulse voltammetry (DPV). Operating voltage of DPV: 0.7–0.9 V (vs. Ag/AgCl) for G, 1.0–1.2 V (vs. Ag/AgCl) for A, 0.8 V (vs. Ag/AgCl), and 1.1 V (vs. Ag/AgCl) for G and A. The concentration ranges for detecting A and G were 3–118 μM and 2–120 μM with detection limits of 0.57 μM and 0.17 μM (S/N = 3), respectively. The nanocomposite was used for detecting G and A in herring sperm DNA, and the content of G and A was found to be about 9 and 11 μM; the RSD values were 3.4 and 1.3%, respectively. Graphical abstract
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PubMed
高影响因子
MOLECULAR MEDICINE
·
2022
·Vol. 28
·期 1
·1-20
·
IF 6.376
Ming Shaoxiong,Tian Jia,Ma Ke,Pei Chengbin,Li Ling,Wang Zeyu,Fang Ziyu,Liu Min,Dong Hao,Li Weijian,Zeng Jianwen,Peng Yonghan,Gao Xiaofeng
Background Kidney stones are composed of approximately 70–80% calcium oxalate. However, the exact mechanism of formation of calcium oxalate kidney stones remains unclear. In this study, we investigated the roles of endoplasmic reticulum stress (ERS), reactive oxygen species (ROS), and the NF-κB signalling pathway in the pathogenesis of oxalate-induced renal tubular epithelial cell injury and its possible molecular mechanisms. Methods We established a model to evaluate the formation of kidney stones by intraperitoneal injection of glyoxylic acid solution into mice and assessed cell morphology, apoptosis, and the expression levels of ERS, ROS, and NF-κB signalling pathway-related proteins in mouse renal tissues. Next, we treated HK-2 cells with potassium oxalate to construct a renal tubular epithelial cell injury model. We detected the changes in autophagy, apoptosis, and mitochondrial membrane potential and investigated the ultrastructure of the cells by transmission electron microscopy. Western blotting revealed the expression levels of apoptosis and autophagy proteins; mitochondrial structural and functional proteins; and ERS, ROS, and NF-κB (p65) proteins. Lastly, we studied the downregulation of NF-κB activity in HK-2 cells by lentivirus interference and confirmed the interaction between the NF-κB signalling and ERS/ROS pathways. Results We observed swelling of renal tissues, increased apoptosis of renal tubular epithelial cells, and activation of the ERS, ROS, and NF-κB signalling pathways in the oxalate group. We found that oxalate induced autophagy, apoptosis, and mitochondrial damage in HK-2 cells and activated the ERS/ROS/NF-κB pathways. Interestingly, when the NF-κB signalling pathway was inhibited, the ERS/ROS pathway was also inhibited. Conclusion Oxalate induces HK-2 cell injury through the interaction between the NF-κB signalling and ERS/ROS pathways.
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高影响因子
RARE METALS
·
2022
·Vol. 41
·期 11
·3783-3794
·
IF 6.318
Zeng Tian-Yi,Zhang Xiao-Yun,Qu Xing-Yu,Li Mei-Qing,Zhang Pan-Pan,Su Ming-Ru,Dou Ai-Chun,Naveed Ahmad,Zhou Yu,Liu Yun-Jian
Single-crystal LiNi 0.8 Mn 0.1 Co 0.1 O 2 (SC-811), which offers better cycle performance compared to the polycrystalline counterpart, has received great attention. We report herein the synthesis of SC-811 with a grain size of 2–4 μm by washing and reheating method, which compares with conventional polycrystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 (PC-811). The discharge capacity of SC-811 reaches 152.1 mAh·g −1 after 100 cycles (86.7% capacity retention) at 1.0C, which is much better than that of PC-811 (130.2 mAh·g −1 , 73.8% capacity retention). By using multiscale characterization, the results unveil that SC-811 can not only improve the reversibility of the H2-H3 phase transitions, suppress the generation of micro-cracks and phase transformations, but also mitigate the undesired side reactions between electrode and electrolyte. Besides, the Li–O bond of SC-811 is longer than that of PC-811, which is conducive to the de-intercalation of Li-ions, thereby enhancing the structural stability. This finding provides an impressive strategy to sustain structural stability and improve the cycling life of Ni-rich layered cathodes. Graphical abstract
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 52
·期 11
·1617-1628
·
IF 2.925
Chen Jinyang,Huang Xiaozhou,Ye Ruihong,Huang Dihui,Wang Yanjun,Chen Sheng
A series of conductive metal–organic frameworks (M-CATs) were synthesized using 2,3,6,7,10,11-hexahydroxytriphenylas a ligand following a solvothermal method, and the Cu-CAT system exhibiting the best performance was identified. Conductive Cu-CAT-anchored reduction graphene oxide composites (Cu-CAT@rGO) were prepared following a hydrothermal method. The microstructures of the systems were further characterized using X-ray diffraction, scanning electron microscopy, energy dispersion spectroscopy, and transmission electron microscopy techniques. The drip-casting membrane method was used for the fabrication of a novel electrochemical sensor based on the conductive Cu-CAT-anchored rGO (Cu-CAT@rGO/GCE). The electrochemical performance of Cu-CAT@rGO/GCE was studied using electrochemical impedance spectroscopy and cyclic voltammetry techniques. The differential pulse voltamme try technique was used for electrochemical sensing to detect the content of bisphenol A (BPA) in beverage bottles. An excellent linear detection range (0.05–100 µmol L −1 ) and a low detection limit (4.9 nmol L − 1 ; based on S/N = 3) were recorded. Therefore, this method can potentially be used to develop a new route for the detection of BPA. Graphical abstract
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高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 11
·1385-1394
·
IF 1.967
Gao Yueying,Wan Yuqi,Liu Lin,Liu Jinghan,Li Jingkun,Li Yu,Ozaki Yukihiro,Pi Fuwei
Based on the Lewis acid’s coordination principle, a surface-enhanced Raman scattering (SERS) chip strategy had been developed for the ultrasensitive quantitation of SO 4 2− . Through the immobilization of silver nanoparticles (Ag NPs) and the construction of the boric acid-based sensing unit, the chip system displayed outstanding merits on the direct sensing of SO 4 2− , e.g., simple operation, ultra-high sensitivity, reproducibility, excellent selectivity and specificity. Moreover, an accurate evaluation was obtained by ratiometric calculations on characteristic peaks (1382 and 1070 cm −1 ) for quantitative detection of SO 4 2− . The detection limit was down to 10 nM. Tap water, beer, and mineral water samples were tested, and high recoveries were achieved (97.12–110.12%). Besides, such SERS chip also displayed strong applicability for the evaluation of SO 3 2− . Therefore, this SERS chip provided a promising idea for the quantification of trace amounts of SO 4 2− and SO 3 2− in the fields of food safety and environmental monitoring. Graphical abstract
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 14
·7629-7647
·
IF 6.123
Shen Chengpeng,Hu Chuanshuang,Zhang Weiwei,Lin Xiuyi,Qi Wei,Zhang Zhen,Gu Jin
Abstract Exploring environmentally benign and economic methods for the preparation of nanocelluloses with controllable morphology would promote their industrial production and utilization. Herein, cellulose I and II nanocrystals (CNC I and CNC II) of rod and sphere shapes were prepared directly from microcrystalline cellulose (MCC, cellulose I) via treatment by acidified zinc chloride molten salt hydrates. Upon adding a small amount of HCl (0.50/0.75/1.0 M) to ZnCl 2 (55/60/65%), the levels of cellulose swelling and hydrolysis could be tuned. Rod-like CNCs I (length: 181.3–279.3 nm) were obtained with 55% ZnCl 2 . Rod-like CNCs with size reduction along with spherical CNCs were produced as ZnCl 2 concentration increased to 60%. Further raising the ZnCl 2 concentration to 65% resulted in CNC II with exclusively spherical shape (diameter: 25.8–292.3 nm). Under the same ZnCl 2 concentration, CNCs produced with high HCl concentration exhibited improved crystallinity (up to 68.4%) and thermal stability (T max up to 343.5 °C). Furthermore, spherical CNC II displayed excellent suspension stability and emulsifying ability to stabilize oil/water Pickering emulsions. The best one stabilized 26% more emulsion volume than the commercially available CNCs and the emulsions showed shear and heat stability. Therefore, this study provides a sustainable method for production of CNCs with tailored characteristics and broad application potentials. Graphical abstract
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高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 6
·1778-1787
·
IF 2.392
Zhang Hao,He Qing-song,Tian Cheng-bo,Wu Yu-wei,Zhao Ze-fang,Yu Min
Inspired by the microstructure of gecko’s toe, two kinds of polyvinyl chloride (PVC) gels with different modulus were poured on a silicon mold with micropillars, and then a bio-inspired adhesive with variable modulus was manufactured in this study. The adhesions of variable modulus and fixed modulus bio-inspired adhesives were tested, respectively, on a smooth glass and a printed circuit board (PCB) with different surface structures. The results show that PVC gel bio-inspired adhesives with variable modulus have many advantages compared with the fixed modulus bio-inspired adhesives. The adhesion of variable modulus bio-inspired adhesives on the rough PCB surface increased by 2–5 times, and due to the use of variable modulus of PVC gel, the surface micropillars can maintain high aspect ratio and flexible tips at the same time. Moreover, the use of PVC gel makes it easier to demold during the bio-inspired adhesives preparation. An adhesion-desorption device was made according to the movement of the gecko toes, and the PCB was successfully grasped.
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高影响因子
危险品化学品经营许可证（带存储）