MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Nannan Wang,Jing Li,Jinpei Hei,Xiaodong Chen,Xiaojie Yin,Yang Han,Mingling Li,Lifeng Cui
The defect engineering is of vital importance for electrocatalysts because it can provide an additional yet advanced tier to further boost catalysis, especially for ultrathin nanosheets of transitional metal compounds with a high surface to bulk ratio and more importantly the ability to engineer the defect along the longitudinal direction of the grain boundaries. Herein, we developed super-thin and ordered face-centered cubic VN nanosheets with grain boundaries using a new facile and in-situ method. The structural and morphological properties of the prepared samples were investigated, finding that the temperature has significant effects on the distribution of sheets. The thickness of nanosheets is only 1.3 nm the same as that of three cubic VN crystal unit cells, which is pivotal to the electrochemical reaction . The detailed electrocatalysts results show that the VN nanosheets (NSs) exhibit interesting ORR performance with the onset potential of 0.93 V and a half-wave potential of 0.86 V. The evenly distributed VN NSs display the highest durability with only 5% attenuation after 50000s operation for the oxygen reduction reaction. We provide a new strategy to synthesize super-thin nitrides nanosheet structure, highlighting the strong correlation between surface engineering and the performance of electrocatalysts for potential practical oxygen reactions.
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Qian Zhang,Xingyuan Qu,Chen Liang,Hongyan Li,Siyu Du,Chang Wang,Yuandong Xie,Yi Zheng,Lei Wang
Objective: This study aimed to investigate the regulatory effect of N-isopropylacrylamide-modified polyethyleneimine (PEN)-delivered oligodeoxynucleotide (ODN) MT01 on bone regeneration in vitro and in vivo . Methods: A polyethylenimine (PEI) derivative, PEN, was constructed through Michael addition and employed as a carrier for ODN MT01 transfection. PEN/MT01 nanocomposites were characterized using agarose gel retardation assay, size distribution, zeta potential and transmission electron microscopy. The Cell Counting Kit-8 (CCK-8) assay was used to detect the effect of PEN on cell viability. Alkaline phosphatase (ALP) staining was used to detect the osteogenic differentiation ability of PEN/MT01 nanocomposite. Real-time quantitative PCR (q RT-PCR) and enzyme-linked immunosorbent assay (ELISA) were used to detect the regulatory effects of PEN/MT01 nanocomposite on osteogenic differentiation gene expression. Rat model was observed using the skull defect method and verified using micro-computed tomography (CT), serum biochemical indices, hematoxylin and eosin (H&E) staining and Immunohistochemistry (IHC). Results: PEN had good biological properties and could deliver MT01 well to achieve efficient transmission of MT01. PEN/MT01 nanocomposites were effectively transfected into MC3T3-E1 cells at a ratio of 6.0. CCK-8 assay displayed that PEN had no cytotoxicity to MC3T3-E1 cells. Additionally, PEN/MT01 nanocomposites could promote the expression of osteogenic genes. In vivo results revealed that PEN/MT01 nanocomposites could promote bone regeneration more effectively than the other groups. Conclusion: PEN has good biocompatibility and low toxicity, which is a good carrier for ODN MT01. PEN-delivered MT01 can be potentially employed as a useful approach to achieving bone regeneration.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4136
·
IF 4.6
Yongwang Ren,Huizhong Xu,Beibei Han,Jing Xu
At present, the selective hydrogenation of α, β-unsaturated aldehydes remains a challenge due to competition between unsaturated functional groups (C=C and C=O). In this study, N-doped carbon deposited on silica-supported nickel Mott–Schottky type catalysts (Ni/SiO2@NxC) was prepared for the selective hydrogenation of cinnamaldehyde (CAL) by using the respective hydrothermal method and high-temperature carbonization method. The prepared optimal Ni/SiO2@N7C catalyst achieved 98.9% conversion and 83.1% selectivity for 3-phenylpropionaldehyde (HCAL) in the selective hydrogenation reaction of CAL. By constructing the Mott–Schottky effect, the electron transfer from metallic Ni to N-doped carbon at their contact interface was promoted, and the electron transfer was demonstrated by XPS and UPS. Experimental results indicated that by modulating the electron density of metallic Ni, the catalytic hydrogenation of C=C bonds was preferentially performed to obtain higher HCAL selectivity. Meanwhile, this work also provides an effective way to design electronically adjustable type catalysts for more selective hydrogenation reactions.Keywords:Ni catalyst;N-doped carbon;electronic effect;cinnamaldehyde hydrogenation
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 10
·8767
·
IF 5.6
Shuo Gao,Xiao Lin,Yeqin Shi,Hu Zhou,Xiao Zheng,Mingyu Li,Ting Lin
A new prenylated indole alkaloid—Penicimutamide CN-oxide (1), a new alkaloid penicimutamine A (2), along with six known alkaloids were isolated from an endophytic fungusPallidocercospora crystallina. A simple and accurate method was used to determine the N-O bond in theN-oxide group of1. By using a β-cell ablation diabetic zebrafish model, compounds1,3,5,6and8showed significantly hypoglycemic activities under the concentration of 10 μM. Further studies revealed that compounds1and8lowered the glucose level through promoting glucose uptake in zebrafish. In addition, all eight compounds showed no acute toxicity, teratogenicity, nor vascular toxicity in zebrafish under the concentrations range from 2.5 μΜ to 40 μM. Importantly, these results provide new lead compounds for the development of antidiabetes strategies.Keywords:prenylated indole alkaloid;N-oxides;endophytic fungus;hypoglycemic activity;zebrafish
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Advanced Healthcare Materials
·
2023
·
IF 10
Shang Wu,Yu Shi,Letao Jiang,Wenzhen Bu,Kai Zhang,Wenzheng Lin,Chun Pan,Zhuobin Xu,Jianwei Du,Hao Chen,Huihui Wang
Intervertebral disc degeneration (IVDD) is associated with oxidative stress induced reactive oxygen species (ROS) dynamic equilibrium disturbance. Nanozymes, as nanomaterials with enzyme-like activity, can regulate intro-cellular ROS levels. In this study, a new carbon dots nanozyme, N -acetylcysteine-derived carbon dots (NAC-CDs), is developed and proved to be an ideal antioxidant and anti-senescent agent in IVDD management. The results confirmed the NAC-CDs have satisfactory biocompatibility and strong superoxide dismutase (250 U mg −1 ), catalase, glutathioneperoxidase-like activity, and total antioxidant capacity. Then, the powerful free radical scavenging and antioxidant ability of NAC-CDs are demonstrated in vitro as observing the reduced ROS in H 2 O 2 induced senescent nucleus pulposus cells (NPCs), in which the elimination efficiency of toxic ROS is more than 90%. NAC-CDs also maintained mitochondrial homeostasis and suppressed cellular senescence, subsequently inhibited the expression of inflammatory factors in NPCs. In vivo, evaluations of imaging and tissue morphology assessments suggested that disc height index, magnetic resonance imaging grade and histological score are significantly improved from the degenerative models when NAC-CDs is applied. In conclusion, the study developed a novel carbon dots nanozyme, which efficiently rescues IVDD from ROS induced NPCs senescence and provides a potential strategy in management of IVDD in clinic.
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高影响因子
MRS Communications
·
2023
·Vol. 13
·期 4
·538-545
·
IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
Graphical abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuelong Xu,Jingyue Wang,Shasha Wang,Zuozhao Zhai,Bin Ren,Zhi Tian,Lihui Zhang,Zhenfa Liu
Multifunctional electrocatalysts are desirable for overall water splitting and zinc-air batteries. In this work, N, S co-doped carbon nanotubes (CNT-NS) with a plentiful of defects were obtained through a novel molecular-level codoped and lattice defect construction method. Thiamine hydrochloride and thiocarbamide were adopted as new precursors in situ doping N and S into multi-walled CNTs surfaces, and lattice defects were constructed by in situ chemical etching using ammonium chloride and ammonium bicarbonate . These surface defects and N,S biatom co-doping synergistic effects can accumulate the CNT-NS to exhibit the superior behavior for electrocatalysis of water splitting and zinc-air batteries. The overpotential for overall water splitting was 1.61 V and the specific capacity for zinc-air batteries was 781 mA h g −1 , which was superior to previous works. According to the Operando Raman spectroscopy measurements, the S atoms can serve as the intrinsic catalytic sites for HER and OER , and the defective CNT structures could enhance the catalytic kinetics by the electron-transfer process. Further, density functional theory (DFT) results also indicated the contribution of binary atoms co-doping for low ΔG H∗ values. Therefore, this work provides the valuable reference for rational design/construction for metal-free catalysts of overall water splitting.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 15
·6643-6655
·
IF 4.5
Zhang Hengchao,Li Yarou,Zhang Yupan,Wu Junfeng,Hu Jiandong,Li Shixin,Li Lanlan
Heavy metal pollution in the environment has posed a serious threat to human health and ecosystems. Therefore, it is urgent to develop a fast and effective sensing method for detecting heavy metal ions (HMIs). A simple and rapid ultrasonic mixing method was used to prepare nanocomposites consisting of cysteine, multi-walled carbon nanotubes, and nitrogen-doped molybdenum disulfide (L-Cys/MWCNTs/N-MoS 2 ). Fully combining the excellent features of 2D materials and carbon nanomaterials, the nanocomposites have been successfully used as sensor interface materials for the simultaneous detection of lead ions (Pb 2+ ) and cadmium ions (Cd 2+ ). The L-Cys/MWCNTs/N-MoS 2 @GCE sensor has a wide linear range for the detection of Pb 2+ and Cd 2+ , with the detection limits as low as 0.67 nM and 5.3 nM, respectively. In addition, the sensor performs well in stability, reproducibility, and anti-interference performance. The L-Cys/MWCNTs/N-MoS 2 @GCE sensor can also be used for the detection of Pb 2+ and Cd 2+ in tap water and lake water with good recovery (> 90%), which may provide a promising strategy for the simultaneous in situ and sensitive detection of heavy metal ions in the aqueous environment.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Chao Li,Yun Teng,Huanong Cheng,Hongwei Jin,Kangkang Li,Zhou Feng,Zhonghao Li,Xinshun Tan,Shiqing Zheng
The density and viscosity of N-butylmorpholine bromide iron-based ionic liquids ( r FeCl 3 / [Nbmm]Br) with two iron-morpholine ratios ( r = 0.8 and 1.0) mol·mol −1 were measured at 303.15–348.15 K and 101.3 kPa. Density and viscosity data were fitted by empirical correlations for temperature. The average relative errors were less than 0.02 % and 2 %, respectively. The density and viscosity decrease with increasing temperature. The density increases with the increase of r , while the viscosity shows the opposite trend. The gas-liquid equilibrium data of H 2 S in r FeCl 3 /[Nbmm]Br were measured by the isochoric pressure drop method at temperatures of 303.15–348.15 K, pressures of 0–200 kPa, and r of 0.8 and 1.0 mol·mol −1 . The total solubility of H 2 S increases with decreasing temperature, increasing pressure, and decreasing r . The measured solubility data were fitted by the reaction equilibrium thermodynamic model. Chemical reaction equilibrium constant and the Henry's constant at different temperatures and different r were obtained. The average relative error of model fitting is less than 3 %. The results show that the chemical reaction equilibrium constant and the Henry’s constant both decrease with the increase of r , and decrease of temperature. Effect of molecular structure on reaction equilibrium constants was explained by quantum chemistry calculation. The absorption of H 2 S in r FeCl 3 / [Nbmm]Br at low pressure is dominated by chemical absorption. With the increase of pressure, the proportion of physical absorption continues to increase, and gradually occupies the main part.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Xiaoqin Wang,Wenqing Li,Zhenhua Li,Tianjiao Han,Jinqiao Rong,Jiangbo Fan,Linjuan Huang,Yu Lu,Zhongfu Wang
Human milk glycans are complex carbohydrates , which play a pivotal role in infant health and neonatal development . Maternal secretor status is known to affect free oligosaccharides in milk. Here, the milk N -glycome of secretor (Se+) and nonsecretor (Se−) individuals was qualitatively and quantitatively analyzed by hydrophilic interaction chromatography-electrospray ionization-tandem mass spectrometry. The total glycosylation , fucosylation , and sialylation of N -glycans was three times higher in the Se+ group compared to the Se− group ( p < 0.001) per equal volume of milk. Importantly, 52 out of 63 N -glycans—including the eight most abundant ones—differed greatly between Se+ and Se− individuals ( p < 0.05). Moreover, nine N -glycans (H5N3F1, H6N3, H3N5F1, H5N5F1, H5N5F1S1, H5N4F3S1, H6N4F2S1, H6N5F4S1, and H8N7S1) were >10 times more abundant in Se+ milk than in Se− milk. These findings lay a glycomics-basis for designing personalized nutrition supplements for infants.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Guodong Sun,Yanan Cao,Deqing Li,Mingzhen Hu,Xinhu Liang,Zhe Wang,Zengjian Cai,Fengyi Shen,Bozhen Chen,Kebin Zhou
Electrochemical reduction of CO 2 to multi-carbon products is very attractive yet particularly challenging due to the low efficiency of C-C coupling over currently used electrocatalysts. In this work, we report a dual-atom catalyst (Cu 2 /NC) capable of selectively promoting electro-reduction of CO 2 to C 2 H 4 . The Faradaic efficiency of CO 2 -to-C 2 H 4 over the Cu 2 /NC is up to ∼34.9% with a current density of 33.6 mA·cm −2 . By contrast, its Cu single-atom counterpart only generates CO without forming C 2 H 4 . The density functional theory (DFT) calculations reveal that the Cu-Cu sites largely promote the adsorption of *CO and reduce the energy barrier of C-C coupling between the adsorbed *CO relative to that of the single Cu sites, which accounts for the high C 2 H 4 selectivity of the Cu 2 /NC.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 25
·期 6
·1535-1542
·
IF 5.16
Hairan Zhang,Qiuyue Zhang,Ling Zhang,Tingting Pei,Erni Li,Huiting Wang,Qian Zhang,Lixin Xia
Graphical Making the switch : A thermally responsive poly( N -isopropylacrylamide)-modified graphene oxide (PNIPAm-GO) nanocomposite was synthesized by using a covalent “grafting-from” strategy. It was further applied as an intelligent PNIPAm-GO/GC electrode to display switchable electrocatalysis toward 1,4-dihydro-β-nicotinamide adenine dinucleotide and dopamine (see scheme). Poly( N -isopropylacrylamide)-modified graphene oxide (PNIPAm-GO), which is a type of thermally responsive GO, was designed and synthesized through a covalent “grafting-from” strategy. The as-prepared modified nanosheets integrated the individual advantages of two components, such as the thermal sensitivity of the PNIPAm terminal as well as the conductivity and the open 2D structure of the GO substrate. PNIPAm-GO was able to perform the reversible regulation of hydrophilicity/hydrophobicity in aqueous solution upon variations in the temperature. Such a unique property might also lead to the utilization of PNIPAm-GO as an intelligent electrode material to achieve a switchable electrochemical response toward a [Fe(CN) 6 ] 3−/4− probe. The PNIPAm-GO modified glassy carbon electrode (PNIPAm-GO/GC electrode) was able to exhibit better electrochemical performance in an ON/OFF switching effect than the PNIPAm-modified glassy carbon electrode (PNIPAm/GC electrode) without GO owing to the intrinsic properties and large surface area of the introduced GO. Moreover, it was found that the PNIPAm-GO/GC electrode also displayed excellent thermally responsive electrocatalysis toward the detection of 1,4-dihydro-β-nicotinamide adenine dinucleotide (NADH) and dopamine (DA), which resulted in two different catalytic statuses on the same electrode. This kind of switchable catalytic performance of the PNIPAm-GO/GC electrode might greatly enhance the flexibility of its application, and thus it is expected to have wide potential for applications in the fields of biosensors and biocatalysis.
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