MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-10
·
IF 5.3
Shan Xiangyu,Lu Juan,Li Chao,Wu Qian,Li Huiling,Yang Shuning,Guo Yanjia,Song Yujia,Li Ruidan,Tian Li
An efficient and innovative electrochemiluminescence (ECL) sensor was developed for trace detection of cyfluthrin. The sensor utilized materials such as lotus root shaped carbon fiber (Co CNFs), cadmium selenide quantum dots (CdSe QDs), and Fe 3 O 4 to amplify Ru(bpy) 3 2+ signals. Co CNFs, with its large specific surface area and porosity, served the purpose of not only enhancing the stability of the sensor by fixing CdSe QDs and Ru(bpy) 3 2+ on the Co CNFs/GCE, but also facilitating electron transfer. CdSe QDs was involved in the luminescence reaction and collaborated with Ru(bpy) 3 2+ to enhance the sensor's sensitivity, while Fe 3 O 4 promoted electron transfer in the system due to its large surface area. The solid-state ECL sensor achieved satisfactory signal under the synergistic action of these components. The ECL signal of the sensor was quenched by cyfluthrin, and a favorable linear relationship was observed between the sensor and cyfluthrin in the concentration range 1 × 10 –12 to 1 × 10 –6 M. The detection limit of the sensor was 3.3 × 10 –13 M (S/N = 3). The utilization of lotus root shaped carbon fiber, CdSe QDs, and Fe 3 O 4 in the Ru(bpy) 3 2+ system demonstrated a synergistic effect for cyfluthrin detection, presenting a new approach for the rapid determination analysis of pesticide residues in foods. Graphical
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Science China-Physics Mechanics & Astronomy
·
2024
·Vol. 67
·期 4
·1-8
·
IF 6.4
Qiao Yuxi,Wang Fuyi,Wang Huaiqiang,Tao Zicheng,Jiang Zhicheng,Liu Zhengtai,Cho Soohyun,Zhang Fayuan,Meng Qingkai,Xia Wei,Yang Yichen,Huang Zhe,Liu Jishan,Liu Zhonghao,Zhu Zengwei,Qiao Shan,Guo Yanfeng,Zhang Haijun,Shen Dawei
Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological properties. Here, using symmetry analysis and first-principles calculations, we propose the coexistence of multiple topological nodal structure in LaSb 2 , including topological nodal surfaces, nodal lines and in particular eightfold degenerate nodal points, which have been scarcely observed in a single material. Further, utilizing angle-resolved photoemission spectroscopy, we confirm the existence of nodal surfaces and eightfold degenerate nodal points in LaSb 2 . The intriguing multiple topological nodal structure might play a crucial role in giving rise to the large linear magnetoresistance. Our work renews the insights into the exotic topological phenomena in LaSb 2 .
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Science China-Physics Mechanics & Astronomy
·
2016
·Vol. 59
·期 2
·1-6
·
IF 1.575
Cheng Wei,Tong Xin,Hu QinGang,Mou YongBin,Qin HaiYan
P-15, a synthetic peptide of 15-amino acids, has been tested in clinical trials to enhance cell adhesion and promote osseointe- gration. This feature of P-15 has also inspired the development of designing new bone substitute materials. Despite the increasing applications of P-15 in bone graft alternatives, few studies focus on the mechanism of cell adhesion promoted by P-15 and the mechanical property changes of the cells interacting with P-15. In this article, we used atomic force microscope (AFM) based single cell indentation force spectroscopy to study the impact of P-15 on the stiffness and the adhesion ability of human jaw bone mesenchymal stem cells (HJMSCs) to hydroxyapatite (HA). We found that the stiffness of HJMSCs increases as the concentration of P-15 grows in short culture intervals and that the adhesion forces between HJMSCs and HA particles in both the presence and absence of P-15 are all around 30pN. Moreover, by calculating the binding energy of HJMSCs to HA particles mixed with and without P-15, we proved that P-15 could increase the adhesion energy by nearly four times. Scanning electron microscope (SEM) was also exploited to study the morphology of HJMSCs cultured in the presence and absence of P-15 on HA disc surface for a short term. Apparent morphological differences were observed between the cells cultured with and without P-15. These results explain the probable underlying adhesion mechanism of HJMSC promoted by P-15 and can serve as the bases for the design of bone graft substitute materials.
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Science China-Physics Mechanics & Astronomy
·
2023
·Vol. 67
·期 1
·1-6
·
IF 6.4
Zhang Yuhang,Liu Cong,Zhu Xiyu,Wen Hai-Hu
Recent claim of discovering above-room-temperature superconductivity ( T c ≈400 K) at ambient pressure in copper doped apatite Pb 10 (PO 4 ) 6 O has stimulated world-wide enthusiasm and impulse of motion. A lot of follow-up works have been carried out with controversial conclusions. To check whether superconductivity is really present or absent in the material, we need samples which should have a rather pure phase of Pb 10− x Cu x (PO 4 ) 6 O. Here we report the characterization results from the Pb 10− x Cu x (PO 4 ) 6 O with a fraction of about 97 wt.% inferred from the fitting to the X-ray diffraction pattern, if assuming Cu 2 S as the only impurity. The resistivity measurements show that it is a semiconductor characterized roughly by a ln(1/ T ) temperature dependence in wide temperature region without trace of superconductivity. Magnetization measurements show that it has a general ferromagnetic signal with a weak superparamagnetic background. Many grains of the sample show clear interactions with a NbFeB magnet. The detected Cu concentration is much lower than the expected nominal one. Our results show the absence of metallicity and superconductivity in Pb 10− x Cu x (PO 4 ) 6 O at ambient pressure, and suggest the presence of strong correlation effect.
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RARE METALS
·
2023
·Vol. 43
·期 2
·562-574
·
IF 8.8
Chen Jia-Xin,Zhang Guo-Qiang,Qin Xian-Ying,Lin Kui,Yang Zi-Jin,Liang Ge-Meng,Xia Yue,Zhang Guo-Bin,Wu Hai-Kun,Cai Qiu-Chan,Lin Hai,Li Bao-Hua
Uncontrolled growth of lithium dendrite will lead to low Coulombic efficiency and poor cycle stability, which hinders the commercialization of lithium metal batteries. Herein, a novel modified lithium anode with reduced graphene oxide conductive network containing trace lithiophilic phosphorus (P-rGO/Cu) is prepared by electrospraying technique combined with heat treatment process. The rGO layer has a concave and undulating conductive structure, which can significantly improve the effective electrical contact between lithium metal and the current collector, speed up the kinetics of interfacial electron transport and reaction, and improve the resistance of the negative electrode to the internal stress caused by volume change of the lithium, which is advantageous for the stability of the SEI film. The extremely small and uniformly distributed red phosphorus element avoids the volume change caused by lithiation to the maximum extent. Lithiophilic two-phase compound Li 3 P obtained by alloying P with Li can directionally induce the homogeneous nucleation and dense deposition of lithium metal, address the issue of lithium dendrites and extend the cycle life of the batteries. The obtained P-rGO/Cu exhibits excellent electrochemical performance with an average Coulombic efficiency (CE) of 98% at a current density of 1 mA·cm −2 for 400 cycles, and the capacity retention rate of the full cell matched with lithium iron phosphate (LFP) is 83% after 400 cycles at 1C. Graphical abstract
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Science China-Chemistry
·
2023
·Vol. 66
·期 5
·1400-1405
·
IF 9.6
Ye Ming-Yu,Zhang Ming-Xuan,Xu Qiao-Fei,Xu Han,Long La-Sheng,Zheng Lan-Sun
Lanthanide luminescent materials with high quantum yield and thermal stability are of key importance for their practical application. Here we report crystal structures and luminescent properties of [Eu(pfbz) 2 (phen)Cl] ( 1 ) and [Tb(pfbz) 2 (phen)Cl] ( 2 ) (pfbz = Pentafluorobenzoate). Single-crystal analysis reveals that both 1 and 2 crystallize in a polar space group of Cmc 2 1 . Investigation on their luminescent properties indicates that the solid-state quantum yields of 1 and 2 are 97.7% and 90.7%, respectively, while their efficiency of the sensitization process is as high as 100%, revealing that polar structures are more favorable to obtain high quantum yields. Thermogravimetric analysis reveals that both 1 and 2 can be stable up to 240 °C. More importantly, temperature-dependent luminescent spectra of 1 indicate its luminescent intensity at 612 nm only decreased by 5% from room temperature to 373 K, whereas at 373 K, its luminescent intensity remains almost constant for 36 h. Considering that 1 represents the highest quantum yield among known Eu-coordination polymers and its performance as the LED material is better than that of commercially widely used luminescent materials of (Sr,Ca)AlSiN 3 :Eu (630 nm) and (Sr,Ca)AlSiN 3 :Eu (640 nm), the present work provides an excellent substitute for commercial LED materials.
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Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Wu Shufen,Yan Songjing,Qi Wei,Huang Renliang,Cui Jing,Su Rongxin,He Zhimin
We demonstrated a facile and environmental-friendly approach to form gold nanoparticles through the reduction of HAuCl 4 by aspartame. The single-crystalline structure was illustrated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The energy-dispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FTIR) results indicated that aspartame played a pivotal role in the reduction and stabilization of the gold crystals. The crystals were stabilized through the successive hydrogen-bonding network constructed between the water and aspartame molecules. Additionally, gold nanoparticles synthesized through aspartame were shown to have good catalytic activity for the reduction of p -nitrophenol to p -aminophenol in the presence of NaBH 4 .
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Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-16
·
IF 7.3
Yang Shuo,Li Kaiyue,Huang Ping,Liu Keyan,Li Wenhui,Zhuo Yuquan,Yang Ziwen,Han Donglai
This study introduces a multifunctional device based on Cu 2 O/g-C 3 N 4 monitoring and purification p–n heterojunctions (MPHs), seamlessly integrating surface-enhanced Raman scattering (SERS) detection with photocatalytic degradation capabilities. The SERS and photocatalytic performances of the Cu 2 O in various morphologies, g-C 3 N 4 nanosheets (NSs) and Cu 2 O/g-C 3 N 4 MPHs with different g-C 3 N 4 mass ratios were systematically evaluated, with a particular emphasis on the Cu 2 O/g-C 3 N 4 -0.2 MPH, where g-C 3 N 4 constituted 20% of the total mass. Multiple optical and electrochemical tests revealed that the Cu 2 O/g-C 3 N 4 -0.2 MPH effectively enhances charge separation and reduces charge transfer resistance. The Cu 2 O/g-C 3 N 4 -0.2 SERS sensor exhibited a relative standard deviation (RSD) below 15% and achieved an enhancement factor (EF) of 2.43 × 10 6 for 4-ATP detection, demonstrating its high sensitivity and consistency. Additionally, it demonstrated a 98.3% degradation efficiency for methyl orange (MO) under visible light within 90 min. Remarkably, even after 216 days, its photocatalytic efficiency remained at 93.7%, and it retained an 84.0% efficiency after four cycles. XRD and SEM analyses before and after cycling, as well as after 216 days, confirmed the structural and morphological stability of the composite, demonstrating its cyclic and long-term stability. The excellent performance of the Cu 2 O/g-C 3 N 4 MPH is attributed to its Z-type mechanism, as verified by radical trapping experiments. The evaluation of the self-cleaning performance of the Cu 2 O/g-C 3 N 4 -0.2 SERS sensor demonstrated that its Z-scheme structure not only provides excellent self-cleaning capability but also enables the detection of both individual and mixed pollutants, while significantly enhancing the SERS signal response through an effective charge transfer enhancement mechanism.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2016
·Vol. 31
·期 6
·1201-1205
·
IF 0.4
Khan Karim,Li Jia,Zou Wenwei,Xu Wei,Yang Ye,Song Weijie
Single-phase insulating 12CaO∙7Al 2 O 3 (C12A7) powder was synthesized using an optimized hydrothermal method. Pure phase of C12A7 was got at a comparatively lower temperature (c.a. 300 °C) than that has been previously reported. The crystallite size of the synthesized C12A7 powder was 7±2 nm. The surface area values calculated for all the samples at a synthesis temperature range of 250-800 °C for 5 h were in the range of about 19-24 m 2 /g, with pore sizes of 12-20 nm. This low-temperature-based synthetic strategy along with nano porous structures and a high surface area value can facilitate catalyst application.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 51
·111611-111626
·
IF 5.8
Cheng Wenyu,Ma Xiaoying,Chen Haoyu,Chen Rongsheng,Wang Dongtian
The excessive presence of phosphate can cause eutrophication in water bodies. Yttrium has an extremely high affinity for phosphorus and is capable of forming stable complexes at low concentrations. Moreover, limitations in the resourcefulness of drinking water treatment residues were observed. In this study, a highly efficient phosphorus removal adsorbent (RJDWTR@Y) was prepared by calcination-alkali leaching-yttrium-loaded composite modification employing domestic drinking water treatment residue as raw material. And the effects of multiple factors on phosphate adsorption by RJDWTR@Y were examined. The results illustrated that the maximum adsorption capacity of the RJDWTR@Y for phosphate was 319.76 mg/g, with the chemical reaction of the multilayer as the predominant adsorption process. The adsorption mechanism is electrostatic gravitational force and the inner sphere complexation effect. RJDWTR@Y was effective against interference even at high concentrations of the coexisting anion. After five cycles, the desorption efficiency of phosphate was 75.11%. Filling the fixed bed with the material can efficiently remove phosphorus from the flowing liquid. The synthesis of RJDWTR@Y and the results of the study indicated that it has good application prospects. In addition to efficiently removing phosphorus, it can also recycle waste and achieve sustainability. Graphical abstract
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IONICS
·
2019
·Vol. 25
·期 10
·4805-4815
·
IF 2.289
Sun Tianjiao,Yao Xiaolin,Luo Yanxiang,Fang Minhua,Shui Miao,Shu Jie,Ren Yuanlong
Aqueous magnesium ion batteries have been identified as potential electrochemical energy storage system due to their similar electrochemical properties to lithium, safety, high abundance, and low cost. Here, micron-sized Na 0.7 MnO 2.05 is prepared by a facile sol-gel method used for cathode material in aqueous magnesium ion batteries. XRD, XPS, SEM, TEM, and EDS were used to test the composition, structure, and morphology of Na 0.7 MnO 2.05 . Na 0.7 MnO 2.05 material is electro-chemical active although the intercalation/deintercalation is much difficult for Mg 2+ . The reversible specific capacities of the Na 0.7 MnO 2.05 cathode material are estimated to be ca. 40, 35, 22, and 13 mAh·g −1 at the current density of 1 C, 2 C, 5 C, and 10 C, respectively. When the current density comes back to 1 C, the charge capacities recover to 40 mAh·g −1 . Furthermore, EIS and GITT measured show that the diffusion coefficient of Mg 2+ ion in lattice of Na 0.7 MnO 2.05 varies from 2.17 × 10 −11 cm 2 ·s −1 to 7.81 × 10 −11 cm 2 ·s −1 in charge process and changes from 6.34 × 10 −12 cm 2 ·s −1 to 7.14 × 10 −11 cm 2 ·s −1 in discharge process.
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npj Flexible Electronics
·
2024
·Vol. 8
·期 1
·14
·
IF 12.3
Xue Fuhua,Peng Qingyu,Ding Renjie,Li Pengyang,Zhao Xu,Zheng Haowen,Xu Liangliang,Tang Zhigong,Zhang Xinxing,He Xiaodong
Developing strain sensors with both high sensitivity and high linearity has always been the goal of researchers. Compared to resistive strain sensors, capacitive strain sensors have incomparable linearity advantages, but have always been limited by low sensitivity. Here, we report a gradient stiffness sliding design strategy that addresses this problem, significantly improving sensitivity while maintaining high linearity. By controlling the distribution of the locally enhanced electric field and the heterogeneous deformation of the substrate, a strain sensor with excellent performance is successfully prepared, exhibiting a giant gauge factor (9.1 × 10 6 ) and linearity ( R 2 = 0.9997) over the entire sensing range, together with almost no hysteresis and fast response time (17 ms). The gradient stiffness sliding design is a general strategy expected to be applied to other types of sensors to achieve ultra-high sensitivity and ultra-high linearity at the same time.
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危险品化学品经营许可证（带存储）