RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 10
·4257-4274
·
IF 3.3
Cao Wenbo,Ren Haitao,Cai Chaochen,Li Dashuai,Li Tingting,Lou Chingwen,Lin Jiahorng
Photocatalysis is a promising technology for wastewater treatment. It is a key problem to develop photocatalytic materials that can efficiently remove tetracycline (TC) under weak light intensity. This article synthesized the UiO-66-NH 2 /Bi 2.15 WO 6 heterojunction using a solvothermal method, and its specific surface area increases by 2.1 times relative to Bi 2.15 WO 6 , endowing good adsorption capacity for TC. Compared with Bi 2.15 WO 6 , the heterojunction effectively improves the separation of electrons and holes and enhances the photocatalytic performance. Under weak light intensity (4 mW cm −2 ), the removal percentage of 50 mg L −1 TC can reach 78.0%, attributing to a synergistic effect between adsorption and photocatalysis. The free radical capture experiment showed that TC was photodegradation mainly under the action of hole (h + ) and superoxide radical (·O 2 − ). Finally, through LC/MS analysis, it is inferred that TC is degraded into H 2 O and CO 2 after a series of reactions such as deamination, dehydroxylation, amide bond breaking and ring opening. This study provides insights for the synthesis of more powerful photocatalysts for TC removal.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 30
·12481-12489
·
IF 4.5
Kang Hongfei,Qin Bihui,Long Jifa,Li Yan,Huang Suping,Xiao Qi
A novel thermal oxidation etching (TOE) strategy was employed here to increase the voids of aerogels. The etched carbon fiber aerogels (ECFAs) have exhibited a network structure constituted by fibers, in which macropores ranging from 0.4 to 5 μm could be observed. Moreover, ECFAs also showed wide distributions in meso/micropores, which further proved that the ECFAs owned a hierarchical pore structure. Meanwhile, porosity was used to measure the space for oil storage inside the ECFAs. Among them, the ECFA-25 (ECFA that was etched for 25 min) had the highest porosity of 99.63%. It also showed the best oil adsorption performance (64.75 g/g), more than twice that of the unetched carbon fiber aerogels. This promising TOE strategy exhibits significant potential as a guidance to obtain efficient sorbents in oil adsorption. Graphical abstract
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ANALYTICAL SCIENCES
·
2023
·
IF 1.6
Xu Yang,Liu Yue,Luo Yu,Xu Xinlin,Li Yingying,Zhao Lin,Li Tiantian,Zhang Yan,He Peng,Mou Xiaoming
Lysozyme (LYS) is a widely used bacteriostatic enzyme. In this paper, we built a sensitive and accurate Raman biosensing platform to detect trace amounts of LYS. The method is based on magnetic spherical nucleic acid formed by a combination of LYS aptamer (Apt) and magnetic beads (MBs). Meanwhile, this method utilizes a dual enzyme-assisted nucleic acid amplification circuit and surface-enhanced Raman scattering (SERS). In this sensing strategy, which is based on the specific recognition of Apt, magnetic spherical nucleic acids were associated with SERS through a nucleic acid amplification circuit, and the low abundance of LYS was converted into a high-specificity Raman signal. Satellite-like MB@AuNPs were formed in the presence of the target, which separated specifically in a magnetic field, effectively avoided the interference of complex sample environment. Under the optimal sensing conditions, the concentration of LYS exhibited a good linear relationship between 1.0 × 10 –14 and 5.0 × 10 –12 M and the limit of detection was as low as 8.3 × 10 –15 M. In addition, the sensor strategy shows excellent accuracy and sensitivity in complex samples, providing a new strategy for the specific detection of LYS. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 23
·1-13
·
IF 2.8
Zhang Changhai,Wang Hairui,Liu Zeyang,Zhang Tiandong,Tang Chao,Liu Xianli,Chi Qingguo
Polymer-based flexible dielectrics have been widely used in capacitor energy storage due to their advantages of ultrahigh power density, flexibility, and scalability. To develop the polymer dielectric films with high-energy storage density has been a hot topic in the domain of dielectric energy storage. In this study, both of electric breakdown strength and energy storage density of poly(methyl methacrylate)/poly(vinylidene fluoride) (PMMA/PVDF) blending films are significantly improved by coating superficial layers and doping organic fillers, which involves using organic molecular semiconductor [6,6]phenyl C61 butyrate methyl ester (PCBM) as fillers doped into PMMA/PVDF (PMMA/PVDF@PCBM), and growing boron nitride (BN) barrier layer on the surface of the PMMA/PVDF@PCBM film (BN-PMMA/PVDF@PCBM-BN). The increased potential barrier height at the BN inorganic layer/metal electrode interface can remarkably suppress charge injection from electrodes. Additionally, the formation of charge traps at the interfaces of PCBM fillers and PVDF/PMMA matrix can significantly limit charge migration. An ultrahigh breakdown field strength of 889.6 kV/mm is achieved in the BN-PMMA/PVDF@0.7wt%PCBM-BN film, which also delivers a maximum discharged energy density of 25.62 J/cm 3 . This work provides an efficient method to enhance energy storage performance of polymer dielectric films by coating superficial layers and doping organic fillers.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 31
·12685-12705
·
IF 4.5
Shen Jiadi,Ma Ming,Huang Yun,Miao Haochen,Wei Xin
This study aimed to evaluate the effects of the combined application of dimethylaminohexadecyl methacrylate (DMAHDM) and 10-methacryloyloxydecyl dihydrogen phosphate (MDP) on dentin bonding and its antimicrobial properties. DMAHDM was incorporated into the adhesives at 5% by mass, where two commercial adhesives were used: (1) MDP-free adhesive (single bond 2); (2) MDP-containing adhesive (single bond universal, SBU). The microtensile bond strength (μTBS) and nanoleakage were analyzed on the combination. The effects of DMAHDM on the interaction between MDP and hydroxyapatite and the degree of conversion were assessed by Fourier transform infrared spectroscopy (FTIR). Antimicrobial properties were examined by live/dead staining assay, colony-forming units (CFU), and metabolic activity, and cytotoxicity was measured using cell counting kit-8 (CCK-8) assay. 5% DMAHDM or MDP-containing groups showed increased immediate μTBS compared with the control group. Nanoleakage showed that 5% DMAHDM or MDP-containing groups presented little amount of silver penetration, while the control group exhibited extensive silver uptake along the bonding interface after water storage aging. FTIR showed that the interaction between MDP and hydroxyapatite was not affected by DMAHDM, besides DMAHDM did not hamper the polymerization of the bonding agents. The adhesives added with DMAHDM inhibited biofilm formation and reduced the biofilm CFU and metabolic activity of Candida albicans and Streptococcus mutans ( P < 0.05). No cytotoxic or slight cytotoxic effect was detected for the experimental materials used (MDP and 5% DMAHDM). The addition of DMAHDM along with MDP can obtain improved dentin bonding with increased antimicrobial performance.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 19
·9979-9992
·
IF 4.4
Jiang Yifan,Zhao Fengqi,Zhang Ming,Liu Hexin,Li Hui,Qin Zhao,Zhang Jiankan
The oxygen vacancy defect engineering has been demonstrated as a promising method to modify the physical and chemical properties of semiconductor materials, but it is rarely used in combustion catalyst. Herein, the effect of oxygen defects in a novel Cu 2 O 1−x nanocombustion catalyst on the thermal decomposition properties and kinetics of AP was studied by differential scanning calorimetry (DSC) and thermogravimetry (TG) analysis for the first time. Density functional theory (DFT) calculations were employed to elucidate the oxygen defect effects and catalytic mechanism by investigating the changes in adsorption energies of NH 3 and its split products on the catalyst surfaces induced by oxygen vacancy defects. The results show that the Cu 2 O 1−x with abundant oxygen vacancy defects exhibited enhanced catalytic activity for the AP thermal decomposition. Also, the kinetic parameters of AP thermal decomposition with and without cuprous oxide nanocatalysts were obtained by Kissinger’s method. With the addition of Cu 2 O 1−x , the exothermic peak temperature and apparent activation energy of AP in high-temperature decomposition stage were respectively reduced by 104.6 °C and 71.6 kJ mol −1 , which are higher than those of Cu 2 O (90.1 °C and 54.6 kJ mol −1 ), showing significant oxygen defect effects. DFT calculations found that the oxygen vacancy defects on the Cu 2 O 1−x nanocatalyst surface can promote the adsorption and complete oxidation of NH 3 , which may adsorb on the surface of AP and restrain its thermal decomposition during low-temperature decomposition process. Graphical abstract Oxygen-deficient Cu 2 O 1−x nanoparticles have been prepared and firstly used as combustion catalyst. The effect of oxygen defects in a novel Cu 2 O 1−x nanocombustion catalyst on the thermal decomposition properties and kinetics of AP was investigated by DSC and TG analysis techniques for the first time.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·
IF 4.3
Zeng Youjun,Nie Zhaogang,Kai Dongyun,Chen Jiajie,Shao Yonghong,Kong Weifu,Yuan Zhengqiang,Ho Ho-Pui,Zhang Fangteng
Wavelength interrogation surface plasmon resonance imaging (WSPRi) sensing has unique advantages in high-throughput imaging detection. The refractive index resolution (RIR) of WSPRi is limited to the order of 10 −6 RIU. This paper demonstrates a novel WSPRi sensing system with a wavelength scanning device of an acousto-optic tunable filter (AOTF) and a low-cost speckle-free SPR excitation source of a halogen lamp. We developed a sensitive quasi-phase extraction method for data processing. The new technique achieved an RIR of 8.84×10 −7 RIU, which is the first WSPRi system that has an RIR in the order of 10 −7 RIU. Moreover, we performed a real-time recording of the formation of the coffee ring effect during brine evaporation and enhanced the biosensor performance of SPR for the first time. We believe the higher RIR and accuracy of the system will benefit more potential applications toward exploring the biomolecules’ behaviors in biological and biochemistry studies. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 20
·1-9
·
IF 2.8
Yan YuanJie,Fu Qiong,Hou YaFei,Hao Xiaoya,Zhu ZhiBiao,Du Peng,Luo LaiHui,Li WeiPing
To affect or suppress space charge movements is capable of improving the breakdown strength ( E b ) and thus discharge energy density ( U d ) of polymer-based nanocomposites. Herein, partial-fluorinated AOF nanosheets with –F-induced electron traps and –OH groups were designed and prepared. Accompanied with the AOF nanosheet filling, both experimental and simulation results prove the synergistic effects of restricted leakage current channel, prolonged breakdown strength, suppressed secondary collision electron movement and strong interfacial interactions are beneficial in enhancing E b of polymer-based nanocomposites. Consequently, the 1-vol% AOF/P(VDF-HFP) nanocomposite exhibits an excellent E b of 548.4 MV/m and thus a satisfactory U d of 18.5 J/cm 3 . Meanwhile, the charge–discharge efficiency ( η ) of the 1-vol% AOF/P(VDF-HFP) nanocomposite remains 81.1%. The results above suggest a superior performance in comparation with pure P(VDF-HFP) (9.1 J/cm 3 and 72.9%). The primary results might provide a new solution for improving U d and η of nanocomposites.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Chen Zheng-Jie,Dong Jiuyi,Wu Jiajing,Shao Qiting,Luo Na,Xu Minwei,Sun Yuanmiao,Tang Yongbing,Peng Jing,Cheng Hui-Ming
Hydrogen production coupled with biomass upgrading is vital for future sustainable energy developments. However, most biomass electrooxidation reactions suffer from high working voltage and low current density, which substantially hinder large-scale industrial applications. Herein, we report an acidic hydrogen production system that combined anodic ascorbic acid electrooxidation with cathodic hydrogen evolution. Unlike C-H and O-H bonds cleavage with slow kinetics in conventional organic oxidation, the highly active enol structure in ascorbic acid allows for an ultralow overpotential of only 12 mV@10 mA/cm 2 using Fe single-atom catalysts, and reaches 1 A/cm 2 at only 0.75 V (versus reversible hydrogen electrode) with approximately 100% Faraday efficiency for hydrogen production. Furthermore, the fabricated two-electrode membrane-free electrolyser delivers an industrial current density of 2 A/cm 2 @1.1 V at 60 °C (2.63 kWh/Nm 3 H 2 ), which requires half of the electricity consumption in conventional water electrolysis (~5 kWh/Nm 3 H 2 ). This work provides a new avenue for achieving industrial-scale hydrogen production from biomass.
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JOURNAL OF FLUORESCENCE
·
2023
·
IF 2.7
Liu Hao,Yang Jing,Sun Xuyuan,Wu Peijie,Wang Guan,Huang Yan,Li Li,Ding Yaping
A facile method which combines the advantages of carbon quantum dots and molecular imprinting technology to design a fluorescence molecular imprinting sensor for the high sensitivity and selective detection of chloramphenicol. The fluorescent molecule imprinted polymers are synthesized by sol-gel polymerization using carbon quantum dots as functional monomers and fluorescent sources, TEOS as crosslinkers, breaking with the traditional understanding of an additional functional monomer. Under optimal experimental, as the concentration of chloramphenicol increases, the fluorescence intensity of the fluorescence molecule imprinting sensor gradually decreases. The concentration of chloramphenicol is linear in the range of 5–100 µg/L and the detection limit is 1 µg/L (N/S = 3). The sensor is able to detect chloramphenicol in milk, enabling the application of real samples. The results show that this work provides an easy method to preparing fluorescent molecular imprinting sensors for the detection of chloramphenicol in milk.
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INFLAMMATION
·
2023
·
IF 5.1
Xing Zeyu,Zhen Yanhua,Chen Jie,Du Mingyang,Li Dongdong,Liu Ruyin,Zheng Jiahe
Atherosclerosis (AS), characterized by a maladaptive inflammatory response, is one of the most common causes of death among the elderly. Karyopherin subunit alpha 2 (KPNA2), a member of the nuclear transport protein family, has been reported to play a pro-inflammatory role in various pathological processes by regulating the nuclear translocation of pro-inflammatory transcription factors. However, the function of KPNA2 in AS remains unknown. ApoE −/− mice were fed high-fat diets for 12 weeks to establish an AS mice model. Human umbilical vein endothelial cells (HUVECs) were treated with lipopolysaccharide (LPS) to establish an AS cell model. We found that KPNA2 was upregulated in the aortic roots of atherosclerotic mice and LPS-stimulated cells. KPNA2 knockdown inhibited LPS-induced secretion of pro-inflammatory factors and monocyte-endothelial adhesion in HUVECs, whereas KPNA2 overexpression exerted the opposite effects. p65 and interferon regulatory factor 3 (IRF3), the transcription factors known to regulate the transcription of pro-inflammatory genes, interacted with KPNA2, and their nuclear translocations were blocked following KPNA2 silencing. Furthermore, we found that KPNA2 protein level was decreased by E3 ubiquitin ligase F-box and WD repeat domain containing 7 (FBXW7), which was downregulated in the atherosclerotic mice. FBXW7 overexpression induced ubiquitination with subsequent proteasomal degradation of KPNA2. Meanwhile, the effects of KPNA2 deficiency on atherosclerotic lesions were further confirmed by in vivo experiments. Taken together, our study indicates that KPNA2 downregulation, regulated by FBXW7, may alleviate endothelial dysfunction and related inflammation in the progression of AS by suppressing the nuclear translocation of p65 and IRF3.
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CELLULOSE
·
2023
·Vol. 30
·期 12
·7853-7864
·
IF 5.7
Song Baiqing,Zhang Tianyi,Yang Kaili,Tian Guangming,Dang Yunzhi,Ma Jianhua
To realize the biocompatibility, mechanical strength, and sustained antibacterial properties of medical materials, it is feasible to introduce antibacterial material components into biomass matrix to prepare medical materials. Herein, zinc oxide (ZnO) was in-situ synthesized in bacterial cellulose (BC) dispersion and filtered into a film, and the BC/ZnO composite film was further immersed in sodium alginate (Alg) solution to construct the second layer structure. The microstructure, mechanical strength, and antibacterial properties of the composite films were investigated systematically. The tensile strength of the BC/ZnO/CAlg sample was achieved at 16.5 ± 2.4 MPa, much higher than that of the Zn 2+ crosslinked CAlg film of 11.5 ± 1.2 MPa. The Zn 2+ cross-linked Alg in the outer layer and the BC/ZnO composite film in the inner layer combined to create a synergistic effect. This secondary structure design ensures good hydrophilicity and hygroscopicity of the material which enables the sustained-release migration of Zn 2+ from the inner layer to the outer layer. Finally, the BC/ZnO/CAlg composite film possesses excellent antibacterial performance against Staphylococcus aureus and Escherichia coli. In addition, this work systematically expounds on the antibacterial and slow-release mechanism of secondary structure composite membranes. The results will provide a database and theoretical reference for applying BC/ZnO/CAlg composite membranes in the medical field.
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