MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 11
·1-11
·
IF 5.7
Li Shuang-Ning,You Ya,Liu Bo,Jiang Xin-Yu,Yu Jin-Gang
A novel nanocomposite material, ferric vanadate intertwined multi-walled carbon nanotubes (FeV/MWCNTs), has been designed which was drop-coated onto a glassy carbon electrode (GCE). The constructed sensor was used for the sensitive determination of uric acid (UA) in fetal bovine serum (FBS) and human serum (HS). A series of characterization and electrochemical tests showed that the ultrasound-assisted assembly of FeV with MWCNTs not only overcame the disadvantages of low conductivity and easy (unwanted) aggregation, but also avoided the decrease in effective surface area due to the severe aggregation of each individual raw material. The fabricated FeV/MWCNTs nanocomposites exhibited higher conductivity, larger effective surface area, and better electrocatalytic activity. In addition, under optimized conditions, the developed electrochemical sensor FeV/MWCNTs/GCE has a lower limit of detection (LOD, 0.05 µM; Ep = 0.268 V vs. Ag/AgCl) and wider linear range (0.20–100 µM), which can satisfy the criteria of trace UA detection. The results of UA determination in FBS (recovery = 95.5–103%; RSD ≤ 3.1%) and HS (recovery = 95.5–103%; RSD ≤ 4.3%) further validated the feasibility of FeV/MWCNTs-based electrochemical sensors for the determination of UA in biological fluids.
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Reproductive Sciences
·
2023
·
IF 2.9
Dai Yan,Sang Xiu-Bo,Bai Wen-Pei
Fetal growth restriction (FGR) seriously threatens perinatal health. The main cause of FGR is placental malperfusion, but the specific mechanism is still unclear, and there is no effective treatment for FGR. We constructed a FGR mouse model by adding exogenous asymmetric dimethylarginine (ADMA) through in vivo experiments and found that ADMA could cause placental dysplasia and induce the occurrence of FGR. Compared with the control group, reactive oxygen species (ROS) production in the placenta was increased in mice with FGR, and the expression of autophagy-related proteins p-AKT/AKT, p-mTOR/mTOR, and P62 was significantly decreased, while the expression of Beclin-1 and LC3-II was significantly increased in the FGR group. Furthermore, ADMA had a favorable effect in promoting the formation of autophagosomes. Hydroxychloroquine (HCQ) and N-acetylcysteine (NAC) improved ADMA-induced disorders of placental development and alleviated ADMA-induced FGR. This study found that ADMA could cause excessive autophagy of trophoblasts by increasing the level of oxidative stress, ultimately leading to the occurrence of FGR, and HCQ and NAC had therapeutic effects on ADMA-induced FGR.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 22
·12467-12479
·
IF 4.4
Pan Weihao,Zhou Qiankun,Yang Wenjie,Nie Shibin,Xu Liangji,Wei Chunxiang,Lu Hongdian,Yang Wei,Yuen Anthony Chun Yin
Acrylonitrile–butadiene–styrene (ABS) composites with less smoke and toxicity hazards (e.g., HCN and NO x ) emission are highly demanded. As a common smoke suppressant, zinc hydroxystannate (ZHS) has been used in various polymers, while the high content, special cube shape and agglomeration restrict its development. To solve these problems, MXene (Ti 3 C 2 T x ) nanosheets were utilized to wrap ZHS nanoparticles (Ti 3 C 2 T x -PDA-ZHS) to improve the dispersion and compatibility of ZHS nanoparticles in ABS, in which polydopamine (PDA) was used as a binder to combine ZHS and MXene nanosheets. Accordingly, the prepared ABS/Ti 3 C 2 T x -PDA-ZHS nanocomposites showed the enhanced properties: (1) ABS/Ti 3 C 2 T x -PDA-ZHS exhibited a 69.7% increase in elongation at break compared to ABS/ZHS at a 2 mass% loading. (2) Owing to the synergistic effect of MXene and ZHS, Ti 3 C 2 T x -PDA-ZHS provided excellent inhibition on heat and toxic gas release during combustion (a reduction of approximately 17.5%, 34.5%, 19.1% and 20.0% of peak heat release rate, HCN, NO and NO 2 , respectively). (3) The smoke density decreased from 525.6 for neat ABS to 423.2 for ABS/Ti 3 C 2 T x -PDA-ZHS with a reduction of 19.5%, and the light transmittance of ABS/Ti 3 C 2 T x -PDA-ZHS (37.7%) was much higher than that of pure ABS (21.2%) at 240 s. Therefore, Ti 3 C 2 T x -PDA-ZHS showed a great enhancement in flammability, toxicity and smoke release reduction of ABS, potentially overcoming the weakness with improved diversity in future applications. Graphical abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Yu Zhijing,Wang Wei,Zhu Yong,Song Wei-Li,Huang Zheng,Wang Zhe,Jiao Shuqiang
Achieving high energy density and long cycling life simultaneously remains the most critical challenge for aluminum-ion batteries (AIBs), especially for high-capacity conversion-type positive electrodes suffering from shuttle effect in strongly acidic electrolytes. Herein, we develop a layered quasi-solid AIBs system with double reaction zones (DRZs, Zone 1 and Zone 2) to address such issues. Zone 1 is designed to accelerate reaction kinetics by improving wetting ability of quasi-solid electrolyte to active materials. A composite three-dimensional conductive framework (Zone 2) interwoven by gel network for ion conduction and carbon nanotube network as electronic conductor, can fix the active materials dissolved from Zone 1 to allow for continuing electrochemical reactions. Therefore, a maximum electron transfer is realized for the conversion-type mateials in DRZs, and an ultrahigh capacity (400 mAh g −1 ) and an ultralong cycling life (4000 cycles) are achieved. Such strategy provides a new perspective for constructing high-energy-density and long-life AIBs.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1084-1091
·
IF 3.1
Gao Zhuangzhuang,Li Baoju,Ou Shuxian,Li Dongsheng,Fang Qianrong,Qiu Shilun,Xue Ming
M etal-organic frameworks (MOFs) are attractive in membrane separation due to their special pore structure and suitable aperture size. The fabrication of defect-free and robust MOF membranes with excellent durability is highly demanded but remains challenging. In this work, we report a one-step active γ -alumina conversion strategy for the facile and reliable fabrication of an MIL-96 membrane. In this case, the γ -Al 2 O 3 sol was dip-coated and sintered on the α -Al 2 O 3 disc as the active aluminum source and substrate for the nucleation and growth of MOF. A continuous and well-intergrown MIL-96 membrane was generated with exceptional stability due to the strong adhesion to the substrate. The resultant MIL-96 membrane yielded a satisfactory H 2 /CO 2 permselectivity and high-temperature resistance, delivering a selectivity of 12.35 with H 2 permeance of 6.20×10 −7 mol·m −2 ·s −1 ·Pa −1 at 150 °C. Moreover, the probe membrane presented remarkable durability and recyclability under harsh hydrothermal conditions. This method paves the way for constructing highly stable and selective MOF membranes and could accelerate the development of advanced membrane separation technologies for gas purification and recycling in addressing the severe energy and environmental problems.
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Nano Research
·
2023
·Vol. 16
·期 10
·12345-12356
·
IF 9.9
Nai Jiyuan,Han Yaning,Zhang Shoudu,Li Youxun,Chen Xiaowei,Wu Ren’an,Wang Li,Jiang Lei
Trimethylphenol is an organic toxic byproduct of industrial process, which is difficult to be eliminated through conventional degradation without harsh conditions. In this work, a sulfite-based oxidation process activated by ZnO-embedded hydrogel was studied for the degradation of 2,4,6-trimethylphenols in the ambient conditions. The ZnO/Na 2 SO 3 oxidative system can effectively degrade trimethylphenol via the generation of radicals such as \({\rm{S}}{{\rm{O}}_4}^{. - }\) , OH · , and \({\rm{S}}{{\rm{O}}_3}^{. - }\) . The presence of hydrogel matrix facilitates the distribution and recyclability of ZnO catalysts while maintaining high degradation kinetics and little leaching of metal ions. Results suggest the promising potential of ZnO-hydrogel in wastewater treatment with good performance in terms of pH sensitivity, anion interference, recyclability, etc. The combination of ZnO catalysts, hydrogel, and sulfite-based advanced oxidation process may provide essential support for the current treatment of alkylated phenols with strong potential in the commercial scale-ups.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 10
·1-8
·
IF 5.7
Qiu Minghao,Ren Yuqing,Huang Lumin,Zhu Xueying,Liang Tikai,Li Meijin,Tang Dianping
The proof-of-concept of sensitive electrochemical immunoassay for the quantitative monitoring of human epidermal growth factor receptor 2 (HER2) is reported. The assay is carried out on iron nitrogen-doped carbon (FeNC) nanozyme-modified screen-printed carbon electrode using chronoamperometry. Introduction of target HER2 can induce the sandwiched immunoreaction between anti-HER2 monoclonal antibody-coated microplate and biotinylated anti-HER2 polyclonal antibody. Thereafter, streptavidin-glucose oxidase (GOx) conjugate is bonded to the detection antibody. Upon addition of glucose, 3,3′,5,5′-tetramethylbenzidine (TMB) is oxidized through the produced H 2 O 2 with the assistance of GOx and FeNC nanozyme. The oxidized TMB is determined via chronoamperometry. Experimental results revealed that electrochemical immunosensing system exhibited good amperometric response, and allowed the detection of target HER2 as low as 4.5 pg/mL. High specificity and long-term stability are acquired with FeNC nanozyme-based sensing strategy. Importantly, our system provides a new opportunity for protein diagnostics. Graphical Abstract
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3591-3601
·
IF 4.58
Shen Yu,Rao Dejiang,Sheng Qinglin,Zheng Jianbin
The authors describe a method to anchor gold nanoparticles (AuNPs) on carboxy-functionalized multi-walled carbon nanotubes (c-MWCNTs) utilizing chitosan as dispersing and protective agent. A sensor for the simultaneous determination of hydroquinone and catechol was then fabricated by placing this nanocomposite on a glassy carbon electrode (GCE). The morphology and composition of the nanocomposites were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray powder diffraction. The electrochemical behavior of the modified GCE was studied by electrochemical impedance spectroscopy, cyclic voltammetry and differential pulse voltammetry. The modified GCE exhibits good electrooxidative activity towards hydroquinone and catechol and therefore was used for simultaneous determination of both, with typical voltages of 30 and 130 mV (vs. SCE). A linear reponse is found for the 0.5 μM to 1.5 mM hydroquinone concentration range, and for the 5.0 μM to 0.9 mM catechol concentration range. The respective lower detection limits are 0.17 and 0.89 μM (at an S/N ratio of 3). The sensitivity is 644.44 μA mM −1 cm −2 for hydroquinone and 770.98 μA mM −1 cm −2 for catechol.
An electrochemical sensor for the simultaneous determination of hydroquinone and catechol was fabricated by modifying the c-MWCNTs/CTS/Au nanocomposites on a glassy carbon electrode (GCE).
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CELLULOSE
·
2022
·Vol. 30
·期 1
·201-209
·
IF 6.123
Zhou Yichen,Hu Zhirong,Yu Mengjiao,Zhang Lu,Yao Jianfeng
Mixed matrix membranes (MMMs) are expected to be strong competitors in gas separation membranes. Nevertheless, the poor interaction between fillers and matrix is a major restriction to prepare MMMs with a higher separation performance. In this work, MIL-101(Cr) was functionalized with −NH 2 , −COOH, and benzenesulfonic acid (−PhSO 3 H) group and these functionalized MIL-101 particles were embedded in cellulose nanofibers (CNFs) to form MMMs. The interaction effect of functionalized MIL-101 with CNFs on the separation performance was discussed. After the adjustment of MIL-101-NH 2 loading, the resulting MIL-101-NH 2 /CNF membrane with 5 wt% loading exhibited enhanced H 2 permeance of ~ 2.56 × 10 − 7 mol m −2 s − 1 Pa − 1 with H 2 /CO 2 ideal selectivity of ~ 21.9.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 9
·1127-1137
·
IF 3.603
Cai Wei-Bin,Liu Dong-Dong,Chen Ying,Zhang Li,Tan Jian-Bo
Polymerization-induced self-assembly (PISA) is an emerging method for the preparation of block copolymer nano-objects at high concentrations. However, most PISA formulations have oxygen inhibition problems and inert atmospheres ( e.g. argon, nitrogen) are usually required. Moreover, the large-scale preparation of block copolymer nano-objects at room temperature is challenging. Herein, we report an enzyme-assisted photoinitiated polymerization-induced self-assembly (photo-PISA) in continuous flow reactors with oxygen tolerance. The addition of glucose oxidase (GOx) and glucose into the reaction mixture can consume oxygen efficiently and constantly, allow the flow photo-PISA to be performed under open-air conditions. Polymerization kinetics indicated that only a small amount of GOx (0.5 μmol/L) was needed to achieve the oxygen tolerance. Block copolymer nano-objects with different morphologies can be prepared by varying reaction conditions including the degree of polymerization (DP) of core-forming block, monomer concentration, reaction temperature, and solvent composition. We expect this study will provide a facile platform for the large-scale production of block copolymer nano-objects with different morphologies at room temperature.
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CELLULOSE
·
2023
·Vol. 31
·期 2
·1159-1173
·
IF 5.7
Huang Juan,Zhang Alei,Xue Huihui,Zhou Jie,Ding Yajun,Xiao Zhongliang
Biological methods present a sustainable approach for treating various waste polymers due to green, low-cost, mild condition and simple operation. This study, a novel biological method to process nitrocellulose (NC) to obtain NC with low nitrogen via nitrate ester removal using fungal Chaetomium elatu m is proposed. The N% of NC continuously declined during the course of six days, from 13.06% to 11.71%, and the intensity of its energetic groups (O-NO 2 , -NO 2 ) also weakened. An examination of the thermal properties of NC revealed that the weight-loss ratio decreased after biotreatment from 86.33% (untreated NC) to 66.20% (treated NC).Furthermore, the kinetic parameters of the thermal decomposition reaction with DSC were calculated and the activation energy ( E a ) of biotreated NC was higher than that of the original, indicating the thermal stability was enhanced. Hence, this structure exploration and thermal analysis provide new methods for further investigating the mechanism of the biological denitrification process and assessing the safety of biotreated NC.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 7
·期 1
·1-14
·
IF 20.1
Ren Junwen,Jiang Guoqing,Wang Zi,Qing Qiuwanyu,Teng Fuli,Jia Zirui,Wu Guanglei,Jia Shenli
Two-dimensional (2D) boron nitride nanosheets (BNNS), with exceptional thermoconductive properties and wide band gap, hold a great promise as candidate fillers for the preparation of the functional dielectric composites. However, the unsatisfactory dispersity in solvents and poor interfacial compatibility with the polymer matrix are still a great baffle for its practical applications. In the present study, we show that non-covalent functionalization of BNNS via polyvinylpyrrolidone (PVP) is a facile approach to optimizing their surface characteristics and facilitating the preparation of hybrid composites. The PVP functionalized BNNS (BNNS@PVP) can be dispersed stably in the aqueous solution for over 2 weeks. Composite films with ultrahigh thermal conductivity (~ 14.5 W m −1 K −1 ) are achieved solely by mixing with BNNS@PVP and one-dimensional (1D) aramid nanofibers (ANFs). Additionally, strong interfacial interactions are constructed between BNNS@PVP and ANFs, which further enables efficient stress transfer and charge dissipation through the 1D/2D configuration, contributing to outstanding tensile strength (~ 184 MPa) and high electric breakdown strength (~ 274 kV mm −1 ) for composite films. All these results demonstrate that surface modification of BNNS is a powerful tool for developing functional materials with multipurpose applications, including thermal management and high-voltage insulation.
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