Small
·
2017
·Vol. 13
·期 47
·1701993
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IF 8.643
Yong Cheng,Qian Li,Chunli Wang,Lianshan Sun,Zheng Yi,Limin Wang
Due to the high theoretical capacity as high as 1494 mAh g −1 , SnO 2 is considered as a potential anode material for high-capacity lithium–ion batteries (LIBs). Therefore, the simple but effective method focused on fabrication of SnO 2 is imperative. To meet this, a facile and efficient strategy to fabricate core–shell structured C/SnO 2 hollow spheres by a solvothermal method is reported. Herein, the solid and hollow structure as well as the carbon content can be controlled. Very importantly, high-yield C/SnO 2 spheres can be produced by this method, which suggest potential business applications in LIBs field. Owing to the dual buffer effect of the carbon layer and hollow structures, the core–shell structured C/SnO 2 hollow spheres deliver a high reversible discharge capacity of 1007 mAh g −1 at a current density of 100 mA g −1 after 300 cycles and a superior discharge capacity of 915 mAh g −1 at 500 mA g −1 after 500 cycles. Even at a high current density of 1 and 2 A g −1 , the core–shell structured C/SnO 2 hollow spheres electrode still exhibits excellent discharge capacity in the long life cycles. Consideration of the superior performance and high yield, the core–shell structured C/SnO 2 hollow spheres are of great interest for the next-generation LIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shuguang Yan,Dongyan Deng,Li Li,Yice Chen,Hongjie Song,Yi Lv
Glutathione (GSH) capped Ag 2 Te nanoparticles (NPs) were prepared in aqueous solution, and then investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectra, resonance Rayleigh scattering (RRS) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the prepared GSH-Ag 2 Te NPs have good monodispersity, stability and 3–5 nm. Cytochrome C was chosen as a model analyte to study the potential of GSH-Ag 2 Te NPs in the RRS analytical application. Under optimal conditions, the RRS intensity of GSH-Ag 2 Te NPs was significantly enhanced by interacting with cytochrome C and good linear relationship between the RRS intensity at 365 nm and cytochrome C concentration in the range of 0.08 μg/mL −22.5 μg/mL was found. The limit of detection (LOD) was 0.024 μg/mL. The application in human serum samples indicated that the GSH-Ag 2 Te NPs could be a promising candidate probe of RRS biosensors in the future due to their fantastic features.
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Frontiers in Microbiology
·
2016
·
IF 4.165
Han Rui,Li Fangbai,Liu Tongxu,Li Xiaomin,Wu Yundang,Wang Ying,Chen Dandan
It is widely recognized that the outer membrane c-type cytochromes (OM c-Cyts) of metal-reducing bacteria play a key role in microbial metal reduction processes. However, the in situ redox status of OM c-Cyts during microbial metal reduction processes remain poorly understood. In this study, diffuse-transmission UV/Vis spectroscopy is used to investigate the in situ spectral reaction of Cr(VI) reduction by c-Cyts in intact Shewanella oneidensis MR-1 cells under different incubation conditions. The reduced c-Cyts decreased transiently at the beginning and then recovered gradually over time. The Cr(VI) reduction rates decreased with increasing initial Cr(VI) concentrations, and Cr(III) was identified as a reduced product. The presence of Cr(III) substantially inhibited Cr(VI) reduction and the recovery of reduced c-Cyts, indicating that Cr(III) might inhibit cell growth. Cr(VI) reduction rates increased with increasing cell density. The highest Cr(VI) reduction rate and fastest recovery of c-Cyts were obtained at pH 7.0 and 30∘C, with sodium lactate serving as an electron donor. The presence of O2 strongly inhibited Cr(VI) reduction, suggesting that O2 might compete with Cr(VI) as an electron acceptor in cells. This study provides a case of directly examining in vivo reaction properties of an outer-membrane enzyme during microbial metal reduction processes under non-invasive physiological conditions.
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GREEN CHEMISTRY
·
2017
·Vol. 19
·期 9
·2201-2211
·
IF 9.125
Wenxiu Cao,Wenhao Luo,Hongguang Ge,Yang Su,Aiqin Wang,Tao Zhang
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) is a crucial reaction included in many biorefinery schemes for the production of renewable chemicals and fuels. The development of highly stable supported Ru-based catalysts in the polar protic liquid phase under hydrothermal conditions is still a major challenge. Here, we prepared a 0.85 wt% Ru/ZrO2@C catalyst using a new stabilization strategy based on the UiO-66 (Zr-MOF) material. The catalytic performance of this Ru/ZrO2@C in LA-to-GVL was tested and compared with commercial 5 wt% Ru/C at 10 bar H2, 413 K in water and also in high protic aqueous solution (pH = 1). The full conversion of LA and quantitative yield of GVL were achieved with both catalysts. However, the 5 wt% Ru/C showed poor resistance to deactivation already after the first run. ICP, XPS, HRTEM, AC-STEM, TPR and physisorption data showed that quick deactivation of Ru/C was mainly caused by the leaching of ruthenium in addition to the loss of surface area via carbonaceous deposition in micro-pores. In contrast, the self-prepared Ru/ZrO2@C catalyst showed no apparent drop in catalytic performance either in water or in high protic aqueous solution upon multiple recycling, and no leaching of ruthenium was found even under harsh conditions (pH = 1). Remarkably, in the Ru/ZrO2@C catalyst, Ru (probable single-atom) was highly dispersed on nanotetragonal ZrO2 (3.3 nm), embedded in the amorphous carbon, and no apparent Ru nanoclusters were observed even after reactions. TPR results indicated that this excellent stability might be attributed to strong metal–support interaction between Ru and nanotetragonal ZrO2.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Nan Mei,Bing Liu
Catalytic reduction of nitro compounds to the amines is of high importance in modern synthetic chemistry . In this study, an efficient method was developed for the transfer hydrogenation of nitro compounds over a magnetic Pd catalyst by the use of NaBH 4 as the hydrogen donor . Full nitrobenzene conversion and high selectivity (>99%) of aniline were produced after 1 h at 60 °C in ethanol. The reductions are successfully carried out in presence of a wide variety of other reducible functional groups in the molecule, except halogen and vinyl substitute nitrobenzene. Kinetic studies indicated the active energy for the transfer hydrogenation of nitrobenzene was 20.93 KJ mol −1 . The transfer hydrogenation of nitrobenzene was confirmed to proceed via azobenzene as the intermediate. More importantly, the catalyst was very stable without the loss of its catalytic activity .
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 30
·15862-15868
·
IF 8.867
Sha-Sha Yi,Jun-Min Yan,Ba-Ri Wulan,Qing Jiang
Sunlight-driven water splitting using light-absorbing semiconductor-based materials is an ongoing strategy to overcome the world-wide environmental pollution and energy crisis. The construction of core–shell-type nanostructures by coupling of the earth-abundant hydrogen generation catalyst Mo2C to the good photoabsorber CdS may be the best combination for photocatalytic hydrogen generation reaction. Thus, in this work, core–shell nanorods consisting of a CdS core and a Mo2C–C shell have been designed and synthesized for the first time. The as-prepared CdS@Mo2C–C nanorods display an excellent hydrogen generation rate of 17.24 mmol h−1 g−1 relative to pure CdS, which may result from the unique one-dimensional nanostructure, the strong interfacial interaction between the core and shell materials, as well as the broadened visible-light absorption range. What's more, the existence of C layers in the core–shell nanorods can facilitate transfer of the photogenerated holes to the outer shell of Mo2C–C, and thus protect the inner CdS from photocorrosion to finally achieve high photostability of the catalyst.
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Molecular Systems Design & Engineering
·
2024
·
IF 3.2
Yan-Yan Li,Yu Feng,Lu Yu,Shuang-Shuang Long,Shu-Qin Gao,Ying-Wu Lin
Human cytochrome c (hCyt c) contains a covalently attached heme group with six-coordination (Met/His) and plays vital biological functions, including electron transfer and peroxidase activity by structural alterations, as well as other functions by interactions with partners such as neuroglobin (Ngb). In this study, we designed and engineered an artificial disulfide bond in hCyt c via double mutations (A51C/G77C) which bridges the Ω-loops C and D. The formation of the intramolecular disulfide bond (Cys51–Cys77) was confirmed by mass spectrometry. The molecular modeling study showed that the disulfide bond did not alter the overall structure, and the local structure where Cys51 was located was well folded into an α-helix. Spectroscopic studies were also performed to probe the effects of the disulfide bond on the protein structure, which revealed that the heme coordination of Met80 was likely weakened. Consequently, the rate of ligand binding and the peroxidase activity were enhanced. Meanwhile, the interaction between hCyt c and Ngb was weakened, as suggested by titration studies. These observations indicate that the dynamic properties of Ω-loops C and D may favor the heme coordination and protein–protein interactions by conformational change, which supports the native functions of hCyt c.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Hu,Dewei Ni,Bowen Chen,Feiyan Cai,Chunjing Liao,Yusheng Ding,Shaoming Dong
Electromagnetic interference (EMI) shielding materials with excellent load-bearing and high-temperature resistance have attracted much attention for both civil and military applications. In this regard, mechanically robust (bending strength of 246 ± 15 MPa) C f @BN/(CrZrHfNbTa)C–SiC high-entropy ceramic matrix composite with BN interphase was designed and fabricated in this work for highly EMI shielding performance and high-temperature resistance. As a result of the synergistic effect of multi-components, mean total EMI shielding efficiency (SE T ) of the composite with 3 mm thickness is up to 32.5 dB (higher than 99.9 % EMI shielding) in Ku-band. This indicates that thickness of the BN interphase has a remarkable effect on EMI shielding performance, indicating that the absorption coefficient ( A ) increases gradually with increasing BN thickness. The EMI shielding performance exhibit excellent high-temperature stability in an oxidation environment. Even after multiple high temperature oxidations in the temperature range of 400–800 °C, the composite remains outstanding EMI shielding performance. This study provides a structural and functional integrated EMI shielding material with a potential long service life at high temperatures.
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Cancer Cell International
·
2024
·
IF 5.3
Boya Deng,Siyang Zhang,Yingying Zhou,Ting Sun,Ying Zhu,Jing Fei,Ailin Li,Yuan Miao
Coiled-coil domain containing 88C (CCDC88C) is a component of non-canonical Wnt signaling, and its dysregulation causes colorectal cancer metastasis. Dysregulated expression of CCDC88C was observed in lymph node metastatic tumor tissues of breast cancer. However, the role of CCDC88C in breast cancer metastasis remains unclear. To address this, the stable BT549 and SKBR3 cell lines with CCDC88C overexpression or knockdown were developed. Loss/gain-of-function experiments suggested that CCDC88C drove breast cancer cell motility in vitro and lung and liver metastasis in vivo. We found that CCDC88C led to c-JUN-induced transcription activation. Overlapping genes were identified from the genes modulated by CCDC88C and c-JUN. CEMIP , one of these overlapping genes, has been confirmed to confer breast cancer metastasis. We found that CCDC88C regulated CEMIP mRNA levels via c-JUN and it exerted pro-metastatic capabilities in a CEMIP-dependent manner. Moreover, we identified the CCDC88C as a substrate of polypeptide N-acetylgalactosaminyltransferase 6 (GALNT6). GALNT6 was positively correlated with CCDC88C protein abundance in the normal breast and breast cancer tissues, indicating that GALNT6 might be associated with expression patterns of CCDC88C in breast cancer. Our data demonstrated that GALNT6 maintained CCDC88C stability by promoting its O-linked glycosylation, and the modification was critical for the pro-metastatic potential of CCDC88C. CCDC88C also could mediate the pro-metastatic potential of GALNT6 in breast cancer. Collectively, our findings uncover that CCDC88C may increase the risk of breast cancer metastasis and elucidate the underlying molecular mechanisms. Supplementary Information The online version contains supplementary material available at 10.1186/s12935-024-03413-2.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
·
IF 4.2
Yang Guo,Rui Zhou
Corrosion-resistant ferromagnetic absorbers (FMAs) with self-healing properties are crucial for enhancing their durability under harsh conditions. Herein, we fabricated lychee-like FeSiAl (FSA)@C@SiO 2 @1H-Benzotriazol (BTA) coupled with multiple heterogeneous interfaces by coating FSA with a C@SiO 2 @BTA layer using sol-gel, thermal reduction, and molecular encapsulation techniques. The FSA@C@SiO 2 @BTA showed superior microwave absorption (MA) performance than FSA, with a widest absorption bandwidth of 10.44 GHz at 1.98 mm and a maximum reflection loss of −57.81 dB at 2.98 mm. The enhanced MA performance was due to the better impedance matching and the synergistic effects of interfacial and dipole polarization induced by the C@SiO 2 @BTA layer. Moreover, the FSA@C@SiO 2 @BTA exhibited a remarkable corrosion resistance, with a corrosion rate of 3.28 × 10 −10 m/s, which was two orders of magnitude lower than that of FSA, and a corrosion protection efficiency of 99.0 %. The epoxy resin coating containing FSA@C@SiO 2 @BTA also demonstrated a self-healing ability within 5 min after being damaged mechanically. This study presents a novel model that integrates MA, corrosion resistance, and self-healing, heralding new avenues for developing corrosion-resistant FMAs in marine applications.
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Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Muhammad Umair Mushtaq,Zhu Lin,Danni Li,Khurram Shahzad Ayub,Zain Abbas,Waqas Qamar Zaman,Ji Yang
The oxygen reduction reaction (ORR) is fundamental in numerous electrochemical energy conversion technologies, necessitating efficient catalysts to enhance reaction kinetics and reduce precious metal usage. This study focuses strategic clustering of Pt-Ni on Calcium Oxide/activated carbon (C/Ca) aerogels. Electrochemical analyses confirmed that incorporating Ni into Pt matrices significantly enhanced ORR activities with Pt 25 Ni 75 -C/Ca composition emerged as optimum. A positive shift in half-wave potential (905 mV vs. RHE) and impressive mass activity (72.50 Ag −1 at 85 V) highlight the potential of this composite as a highly effective and stable ORR catalyst. Pt-C/Ca demonstrated performance fluctuation, while Pt 25 Ni 75 -C/Ca showed remarkable stability after 40,000 cycles. Furthermore, C/Ca aerogels exhibited a significantly increased BET surface area, and the presence of Pt-Ni/pyridinic-N species on its surface C/Ca aerogel provided supplementary active sites that facilitated the adsorption and reduction of O 2 during ORR.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Shuo Qin,Zongze Li,Boran Zhou,Bin Liu,Yuting Xue,Ruixue Zhao,Lirong Zheng,Zhengbo Chen,Xia Zuo
Overuse of benzoate as a preservative is bad for human health. Therefore, we need to achieve quantitative detection of benzoate. Colorimetric nanozyme sensors have garnered significant interest owing to their exceptional efficacy and affordability. In this article, Fe-N-C dodecahedral nanozymes with superior peroxidase-like catalytic activity are prepared using ZIF-8 as a precursor. Therefore, we construct a colorimetric sensor for benzoate detection with a detection limit of 0.33 μM through integrating the inhibitory impact of benzoate on D-amino acid oxidase activity with the Fe-N-C-catalyzed 3,3′,5,5′-tetramethylbenzidine (TMB)–H 2 O 2 system, and this reaction is completed within 10 min. It is noteworthy that a recovery rate of 96.8–109 % has been attained for the detection of benzoate in beverages.
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危险品化学品经营许可证（带存储）