JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7164-7170
·
IF 2.1
Li Yingxiang,Liang Deyin,Zhang Xing,Xiong Zhe,Tang Bin,Si Feng,Fang Zixuan,Li Hao,Shi Zitao,Chen Jingjing
This study presents the dielectric properties of Ba 2 Zr 2 Si 3 O 12 ceramics, synthesized using the solid state method. The cubic crystal structure of Ba 2 Zr 2 Si 3 O 12 ceramics was conclusively verified through the analysis of XRD patterns and subsequent structural refinement. Refined lattice parameters of a = b = c = 10.23178 Å were found, with a corresponding unit cell volume of V = 1071.159026 Å 3 . The grain microstructure of the ceramics was characterized using SEM, which showed density of 97.6% for the Ba 2 Zr 2 Si 3 O 12 ceramic. The Si-O bond valences ( V Si-O ) were found to be closely related to the τ f of the Ba 2 Zr 2 Si 3 O 12 ceramics. The microwave dielectric properties of the Ba 2 Zr 2 Si 3 O 12 ceramics sintered at 1490°C were ascertained to be ε r = 15.08, Q × f = 14885 GHz ( f = 9.9 GHz), and τ f = −78.6 ppm/°C.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 4
·1-11
·
IF 1.53
Yang Zhouxiaoshuang,Wang Feng,Liu Hui
With the spiropyran-containing compound as the initiator, dual responsive spiropyran-ended poly(N-vinyl caprolactam) (SP-PNVCL) was synthesized by atom transfer radical polymerization. The structure of the resulting polymer was characterized by 1 H NMR and gel permeation chromatography, and the polymer had both reversible light-responsive and thermo-sensitive behaviors. Metal ions could be bound between merocyanine formed by photoisomerization of spiropyran and the amino group of N-vinyl caprolactam unit through synergetic coordination. The complexation of SP-PNVCL with several metal ions was investigated by UV-Vis absorption spectroscopy, and it was found that SP-PNVCL might be used as a potential recognition probe for Fe 2+ , accompanied by obvious color change from colorless to brown by naked eye. The detection limit and photo-reversible recyclable behaviors of SP-PNVCL for Fe 2+ were also investigated in details. The kind of spiropyran-ended poly(N-vinyl caprolactam) had great application potential in environment protection and biological area.
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高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2015
·Vol. 44
·期 12
·2383-2392
·
IF 1.177
Zhou Li,Liu Chunli,Fan Liqun,Wang Jinhu,Wang Shumin
Enthalpies of solution and densities of diglycine in aqueous solutions of LiNO 3 , NaNO 3 and KNO 3 were measured at 298.15 K. Transfer enthalpies ( \( \Delta_{\text{tr}} H \) ) and transfer partial molar volumes ( \( \Delta_{\text{tr}} V_{\phi }^{0} \) ) were derived for diglycine. The transfer enthalpies of diglycine from water to the three alkali metal nitrates solutions are negative while the transfer partial molar volume values are positive. The absolute values of \( \Delta_{\text{tr}} H \) and \( \Delta_{\text{tr}} V_{\phi }^{0} \) from water to the same concentration in salt solutions in both cases vary in the relative order LiNO 3 < KNO 3 < NaNO 3 . The results are discussed in terms of electrostatic interaction and structural interactions. Electrostatic interaction between the diglycine zwitterion and salts gives large contributions to Δ tr
H and \( \Delta_{\text{tr}} V_{\phi }^{0} \) . But, structursal interaction is responsible for the abnormal behavior of diglycine in aqueous LiNO 3 solutions.
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高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 2
·791-797
·
IF 3.741
Huang Su-Su,Liu Li,Mei Li-Ping,Zhou Jia-Ying,Guo Fei-Ying,Wang Ai-Jun,Feng Jiu-Ju
Bimetallic gold-copper nanochain networks (AuCu NCNs) were prepared by a single-step wet-chemical approach using metformin as a growth-directing agent. The formation mechanism was investigated in detail, and the AuCu NCNs were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The nanocrystals were deposited on glassy carbon electrode and this resulted in a highly sensitive sensor for nitrite. Features include a low working potential (best at 0.684 V vs . SCE), fair sensitivity (17.55 μA mM −1 ), a wide linear range (0.01 to 4.0 mM), a low detection limit (0.2 μM, S/N = 3), and superior selectivity as compared to other sensors.
Gold-copper nanochain networks were prepared by a metformin-assisted one-pot wet-chemical method. The nanocrystals were used to fabricate a nitrite sensor with low detection limit, high selectivity, good reproducibility and stability.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 2
·380-390
·
IF 1.986
Ji Lijun,Liu Xi,Xu Tong,Gong Mindong,Zhou Shu
A carbon/carbon-doped titanium dioxide double-layer hollow microsphere (C/TiO 2 microsphere) photocatalyst was prepared by hydrolysis of thermal expendable microspheres (TEMs) and a TiO 2 sol–gel process. The thickness of the TiO 2 and carbon layers was controlled by the concentration of sulfuric acid used for hydrolyzing the TEMs. The photocatalytic activity of the samples was studied with rhodamine B as a target degradation product. The result showed that the photocatalytic activity was affected by the thickness of the carbon and TiO 2 layers significantly. The C/TiO 2 microspheres obtained with 65% H 2 SO 4 possessed the best photocatalytic activity. Compared with pure TiO 2 , the visible light absorption range of the C/TiO 2 microspheres was expanded to 643 nm; the specific surface area was more than five times of the pure TiO 2 ; the response intensity of photocurrent was ten times of the pure TiO 2 . The degradation rate of rhodamine B caused by the photocatalysis of the C/TiO 2 microspheres was 96% in 140 min, and kept 83% after three times of reuse. The C/TiO 2 microspheres were easy for recycling and showed great potential in wastewater treatment.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 2
·304-310
·
IF 1.307
Wang Dong,Li Zhenwei,Zhang Qian,Liu Jie,Yang Yu,Han Jishu,Wang Lei
Silicon(Si) with high theoretical capacity has attracted tremendous attention as the next-generation anode material for Li-ion batteries, but the huge expansion during cycling restricts its practical application. Designing a low-cost, accessible robust network binder is a facile and effective approach to suppress the volume change effect and achieve the commercial application of Si anodes. Different previous studies focused on the network binder macromolecule main chain, this manuscript pays attention to the study of small-molecule cross-linker. Herein, cross-linked network binders using alginate acid and two kinds of cross-linkers, i.e., D -sorbitol and isosorbide(Alg-DS and Alg-IS binders) are synthesized. It was found that not only the chemical structure of the cross-linker but also the physicochemical property, such as melting point affect greatly the mechanical properties of the network binder. As a result, the Si anode with an Alg-DS binder dried below the melting point of DS shows the best cycling stability with a high capacity of 2249.8 mA·h/g and a retention rate as high as 95.9% after 100 cycles. This study gives a new view to design robust network binders for stable Si anodes.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12044-12055
·
IF 2.22
Bateer Buhe,Xie Ying,Tian Chungui,Ping Wenxiang
Carbon-based magnetic composites with enhanced electromagnetic (EM) wave absorption ability have received intensive attention. Herein, a composite of N-graphene and small size magnetic Co nanoparticles (NPs) with advantages of excellent dielectric ability was synthesized through an in situ grown method. Under optimized conditions, Co NPs decorated on NGN (Co/NGN-2) have the best EM wave absorption performance, of which a minimum reflection loss of − 45.8 dB can be achieved at 13.48 GHz with a thin coating of 2 mm at 15 wt% filler loading in paraffin wax. The effective absorption bandwidth is about 4.6 GHz in Ku-band (12.4–18 GHz). Importantly, the effective absorption bandwidth can be extended by changing the thickness of the absorber. In fact, the coupling of NGN with Co NPs can form an effective impedance match, and thus the small size Co NPs with low density and good performance decorated on NGN material make the present method promising for EM applications.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 16
·4237-4246
·
IF 4.157
Liu Hui,Xia Lei,Shen Chengyin,Huang Chaoqun,Chu Yannan
Methamphetamine (MA) is a highly addictive and illegal psychostimulant drug and is currently one of the most commonly abused illicit drugs in the world. The on-site rapid detection of trace amounts of MA and screening illicit drugs in clandestine laboratories is important for drug enforcement agencies and the forensic community in general. However, detecting methamphetamine in the presence of nicotine and cigarette smoke by ion mobility spectrometry faces difficulty due to the overlapped spectral peaks of methamphetamine and nicotine. In this work, a new method was developed to detect MA using pyridine as a dopant in the presence of nicotine by a homemade ion mobility spectrometry. The reduced mobilities of MA and nicotine were measured under the temperatures of the drift tube from 40 to 120 °C and doping with pyridine. The result shows that the temperature of 100 °C is beneficial to resolve the two substances. The concentration of doped pyridine is optimized to be 18 ppm. In this doped experiment, the reaction rate of nicotine is higher than that of MA by measuring the instrumental responses of MA and nicotine. No matter how high the nicotine content is, the interference of nicotine can be eliminated in the detection of MA doped with pyridine. This method is also successfully applied for the determination of MA and nicotine simultaneously in real saliva samples. The limit of detection of MA was measured to be about 0.5 ng/μL. The promising results in this work provide an effective method for on-site detection of MA. Graphical abstract
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高影响因子
Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 4
·2811-2819
·
IF 3.006
Wu Ping,Ben Tingting,Zou Hui,Chen Yilun
The phenolic compounds in dandelion were extracted using different ethanol percentage solutions, identified with HPLC-MS, and their scavenging capabilities of DPPH, ABTS and OH radicals were determined. Then the excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC) was conveyed to analyze the relationship between phenolics, components scores of PARAFAC model and antioxidant capacities, based on linear regression method. The results showed that the relative content of chicoric acid, esculetin, caffeic acid, gallic acid monohydrate, eupatilin, caffeic acid-3-glucoside, corchorifatty acid F, and luteolin was higher than 0.5%, and the extraction solutions with 100% and 75% water had a better scavenging capacity of DPPH, ABTS and OH radicals. Two components PARAFAC model was identified with the comparatively higher sum of squares, core consistency values, and lower interactions numbers, and the established equations indicated the component scores had a linear regression relationship with antioxidant capacities of DPPH, and ABTS. The paper was proposed for the first time that the component scores of PARAFAC model might be treated as a useful indication for antioxidant capacity evaluation.
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高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 5
·954-964
·
IF 1.797
Yu Yunge,Liu Yan,Zhang Fuli,Jin Shixin,Xiao Yaqian,Xin Binjie,Zheng Yuansheng
Polyurethane is a thermoplastic elastomer with excellent physical and chemical properties, the hydrophilicity of PU limits the wide application in the waterproof and breathable materials market. In this study, SiO 2 nanoparticles were hydrophobically modified by fluorosilane to prepare the fluorosilane-modified silica (F-SiO 2 ), then it was added into the synthesized polyurethane to prepare waterproof and breathable film (F-SiO 2 /PU) by electrospinning. Compared with polyurethane membranes, F-SiO 2 /PU composite membranes could form rough morphological surface through the blending of F-SiO 2 . The experimental results showed that the water contact angle of the composite nanofiber membranes increase with the addition of the amount of modified silica, and the water contact angle reached 135 o when the dosage of F-SiO 2 was 5 wt%. The composite nanofiber membranes could be endowed with excellent waterproof performance, hydrophobicity (50 kPa) and moisture permeability (10.4 kg/m 2 •h). Besides, the prepared membrane can remain the hydrophobic property stability under the dynamic tensile of large-scale deformation.
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高影响因子
INFLAMMATION
·
2024
·
IF 4.5
Jin Guang-Nan,Wang Yu,Liu Yi-Ming,Lu Yu-Nan,Lu Jing-Mei,Wang Jing-He,Ma Jing-Wen,Quan Yan-Zhu,Gao Hong-Yan,Cui Yue-Xian,Xu Xiang,Piao Lian-Xun
Depression, recognized globally as a primary cause of disability, has its pathogenesis closely related to neuroinflammation and neuronal damage. Arctiin (ARC), the major bioactive component of Fructus arctii , has various pharmacological activities, such as anti-inflammatory and neuroprotective effects. Building on previous findings that highlighted ARC's capability to mitigate depression by dampening microglial hyperactivation and thereby reducing neuroinflammatory responses and cortical neuronal damage in mice, the current study delves deeper into ARC's therapeutic potential by examining its impact on hippocampal neuronal damage in depression. Utilizing both chronic unpredictable mild stress (CUMS)-induced depression model in mice and corticosterone (CORT)-stimulated PC12 cell model of neuronal damage, the techniques including Nissl staining, immunohistochemistry, western blotting, ELISA, lactate dehydrogenase assays, colony formation assays, immunofluorescence staining and molecular docking were employed to unravel the mechanisms behind ARC's neuroprotective effects. The findings revealed that ARC not only mitigates hippocampal neuropathological damage and reduces serum CORT levels in CUMS-exposed mice but also enhances cell activity while reducing lactate dehydrogenase release in CORT-stimulated PC12 cells. ARC attenuated neuroinflammatory responses and neuronal apoptosis by inhibiting the overactivation of the P2X7 receptor (P2X7R)/NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome signaling pathway, similar to the effect of A438079 (P2X7R antagonist). Interestingly, pretreatment with A438079 blocked the neuroprotective effect of ARC. Computer modeling predicted that both ARC and A438079 have strong binding with P2X7R and they have the same binding site. These results suggested that ARC may exert a neuroprotective role by binding to P2X7R, thereby inhibiting the P2X7R/NLRP3 inflammasome signaling pathway.
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PubMed
高影响因子
Discover Nano
·
2023
·Vol. 18
·期 1
·1-13
·
IF 0
Yang Weihuang,Mu Yuanbin,Chen Xiangshuo,Jin Ningjing,Song Jiahao,Chen Jiajun,Dong Linxi,Liu Chaoran,Xuan Weipeng,Zhou Changjie,Cong Chunxiao,Shang Jingzhi,He Silin,Wang Gaofeng,Li Jing
Large-area, continuous monolayer WS 2 exhibits great potential for future micro-nanodevice applications due to its special electrical properties and mechanical flexibility. In this work, the front opening quartz boat is used to increase the amount of sulfur (S) vapor under the sapphire substrate, which is critical for achieving large-area films during the chemical vapor deposition processes. COMSOL simulations reveal that the front opening quartz boat will significantly introduce gas distribute under the sapphire substrate. Moreover, the gas velocity and height of substrate away from the tube bottom will also affect the substrate temperature. By carefully optimizing the gas velocity, temperature, and height of substrate away from the tube bottom, a large-scale continues monolayered WS 2 film was achieved. Field-effect transistor based on the as-grown monolayer WS 2 showed a mobility of 3.76 cm 2 V −1 s −1 and ON/OFF ratio of 10 6 . In addition, a flexible WS 2 /PEN strain sensor with a gauge factor of 306 was fabricated, showing great potential for applications in wearable biosensors, health monitoring, and human–computer interaction.
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