查找使用阿拉丁产品的科研文献

Structure, Dielectric Properties, and Grain Growth Kinetics of MO-ZrO2-Ta2O5 (M = Zn, Co) Microwave Ceramics

Jiang Xi,Zhang Yun,Ding Shihua,Song Tianxiu,Hou Zhengpeng,Xiao Junwen,Wang Yarong

MO-ZrO 2 -Ta 2 O 5 (M = Zn, Co) ceramics were prepared by solid-phase reaction method. Thermo-gravimetric-differential thermal behavior, crystal structure, and microwave dielectric properties of ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 ceramics were compared in this paper. Both of them exhibited monoclinic wolframite structure. Densest microstructures with uniform grains were obtained at 1400°C and 1425°C in the cases of M = Zn and Co, respectively. ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 exhibited comparable ε r  ~ 20.26 and 24.30, while the former had Q  ×  f  ~ 60, 983 GHz and the latter had Q  ×  f  ~ 95,300 GHz. The grain growth exponent and activation energy obtained from the phenomenological kinetic equation indicated the growth process of ceramics. The grain growth of Zn-based ceramic was dominated by interfacial reactions and lattice diffusion. For the other one, the grain growth mechanisms were grain boundary diffusion and lattice diffusion at high temperatures. The grain growth progress of them both affected by lattice diffusion. The growth process of ZnO-ZrO 2 -Ta 2 O 5 ceramics was faster than that of CoO-ZrO 2 -Ta 2 O 5 ceramic. However, the grains were overgrown and grew slowly at 1425°C and 1450°C, which was caused by the excessive high temperature.

Utilizing Proteomic Analysis to Assess the Biocompatibility and Growth Behavior of Human Immunodeficiency Virus-Associated Colorectal Cancer Cells on Polylactic Acid/Polyglycolic Acid Composite Scaffold

Yang Ke,Chen Zheng,Xu Dayong,Peng Fang

This research aimed to analyze the biocompatibility and growth behavior of human immunodeficiency virus (HIV)-associated colorectal cancer (CRC) cells on a polylactic acid/polyglycolic acid (PLA-PCL) composite nanofiber scaffold (CNS) using proteomic analysis. The PLA-PCL CNS was prepared using a gel extraction phase separation (GEPS) method in a dioxane/ethanol solvent system, and the effects of gel temperature, PLA-PCL mass ratio (MR), solvent-to-polymer MR on the structure and properties of the PLA-PCL CNS were analyzed. Subsequently, Lappaol F (LAF) was incorporated into the PLA-PCL CNS using electrospinning (ES) technology, and tissue specimens were obtained from HIV-associated CRC patients to investigate the impacts of LAF-PLA-PCL CNS on the growth behavior of HIV-associated CRC cells through mass spectrometry and bioinformatics analysis. Field emission scanning electron microscopy (FE-SEM) revealed that the CNS could be obtained at gel temperatures between −20 °C and −10 °C, PLA-to-PCL MRs of 1:1, 3:2, 7:3, and ethanol content of 5%–15%. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) showed that the PLA-to-PCL MR of 70:30 exhibited compatibility and crystallinity of the PLA-PCL CNS, while the porosity increased with an increase in PCL content. Fourier-transform infrared spectroscopy (FTIR) analysis indicated a good biological activity of the PLA-PCL CNS. The relative cell proliferation (RCP) and cytotoxicity grades exhibited no marked differences (P >0.05) between the cancer cells cultured with DMEM and those with PLA-PCL scaffold extract over time. Proteomic analysis identified 127 differentially expressed proteins (DEPs) in HIV-associated CRC cells co-cultured with LAF-PLA-PCL CNS, and Gene Ontology (GO) protein and KEGG pathway enrichment analysis (KEGG analysis) revealed that the LAF-PLA-PCL NCS could affect the cell cycle (CC) of HIV-associated CRC cells. In conclusion, the PLA-PCL NCS exhibited good compatibility, crystallinity, and biological activity, while the LAF-PLA-PCL NCS showed the potential to inhibit cell proliferation by affecting the CC.

1H NMR-based serum metabolomics analysis of the age-related metabolic effects of perinatal exposure to BPA, BPS, BPF, and BPAF in female mice offspring

Meng Zhiyuan,Zhu Wentao,Wang Dezhen,Li Ruisheng,Jia Ming,Yan Sen,Yan Jin,Zhou Zhiqiang

The widespread application of bisphenols (BPs) in the industry has made them ubiquitous in the environment, causing potential environmental risks. Its unknown impacts on human being have received more and more attention. In this study, we have assessed the metabolic effects of perinatal exposure to bisphenol A (BPA) and its substitutes (bisphenol S (BPS), bisphenol F (BPF), and bisphenol AF (BPAF)) in female mice adolescent offspring and female mice adulthood offspring. 1 H NMR-based serum metabolomics showed that metabolic profiles were disturbed with BPA and its three substitutes exposure in female mice adolescent offspring and female mice adulthood offspring. In addition, age-related metabolic effects were found based on changes in serum endogenous metabolites and metabolic pathways. Specifically, metabolic pathway analysis showed that major disturbed metabolic pathways in female mice adulthood offspring compare with female mice adolescent offspring also changed significantly. With the increase of age of the female mice offspring, changes in the metabolic pathways became more obvious in the BPA treatment group. Conversely, partially disturbed metabolic pathways were restored in the BPS, BPF, and BPAF treatment groups. In conclusion, perinatal exposure to BPA and its three substitutes significantly interferes with metabolic profiles and metabolic pathways, and this metabolic effects were age-related. These results offer more detailed information about the age-related metabolic effects of perinatal exposure to BPA, BPS, BPF, and BPAF in female mice offspring and provide data for systematic evaluation of the health risk assessment of BPA and its substitutes.

Bioactive Constituents of F. esculentum Bee Pollen and Quantitative Analysis of Samples Collected from Seven Areas by HPLC

Feng Li,Sen Guo,Shanshan Zhang,Sainan Peng,Wei Cao,Chi-Tang Ho,Naisheng Bai

Bee pollen contains all the essential amino acids needed by humans. China is the largest producer of bee pollen in the world. In the present study, we identified 11 fatty acids inF. esculentumbee pollen oil by GC-MS analysis, and 16 compounds were isolated fromF. esculentumbee pollen by column chromatography and identified. A high-performance liquid chromatography-diode array detector (HPLC-DAD) method was established for the quality control ofF. esculentumbee pollen. A validated HPLC-DAD method was successfully applied to the simultaneous characterization and quantification of nine main constituents in seven samples collected from seven different areas in China. The results showed that all standard calibration curves exhibited good linearity (R2> 0.999) in HPLC-DAD analysis with excellent precision, repeatability and stability. The total amount in the samples from the seven regions ranged from 23.50 to 46.05 mg/g. In addition, seven compounds were studied for their bioactivity using enzymic methods, whereby kaempferol (3) showed high α-glucosidase inhibitory activity (IC50: 80.35 μg/mL), ergosterol peroxide (8) showed high tyrosinase inhibitory activity (IC50: 202.37 μg/mL), and luteolin (1) had strong acetylcholinesterase inhibitory activity (IC50: 476.25 μg/mL). All results indicated thatF. esculentumbee pollen could be a nutritious health food.Keywords:bee pollen;enzyme inhibitory activity;HPLC-DAD;GC-MS;quality analysis

Interface-oriented engineering of bio-fermented bamboo-derived carbon via F/O doping for advanced sodium-ion storage

Dongke Cai,Mingxia Tang,Shuai Jiang,Debin Yan,Yinchuan Zhu,Yan Meng,Dan Xiao,Qian Zhao,Wei Feng,Xicui Zhang

This study presents a sustainable F/O co-doped hard carbon (PD-F800) derived from panda excrement via NH 4 F-assisted hydrothermal doping for sodium-ion battery anodes. PD-F800 delivers a reversible capacity of 472.87 ± 5.1 mAh g −1 at 100 mA g −1 with an initial Coulombic efficiency of 66.2 ± 2.1 %, maintains 317.72 ± 4.0 mAh g −1 at 1000 mA g −1 , and retains 72.7 ± 3.3 % capacity after 1000 cycles. In situ XRD/Raman, EIS/DRT and GITT jointly indicate that F/O co-doping introduces non-bonded F states and regulates defect/interfacial chemistry, which lowers Na + adsorption/desorption barriers, increases Na + diffusion kinetics, and stabilizes an inorganic-rich SEI, thereby coupling fast surface-controlled storage with reversible interlayer/pore processes. This work establishes a safe, scalable route from waste biomass to high-performance anodes and clarifies the structure-interface-kinetics linkage enabling advanced Na-ion storage.

Strategic Design of High-Capacity P2-Type Sodium Layered Oxides Enabled by Multifunctional Li/F/Cu Co-Doping

Yu Duan,Zihan Ma,Jiaxuan He,Yingying Huang,Shuo Bao,Jinlin Lu

P2-type layered cathode materials have low energy density due to low initial Na content. In this research, high sodium content P2-type cathode material Na0.8Li0.08Ni0.23Mn0.67Cu0.1O1.92F0.08 (NMC-LF), was synthesized by a simple high-temperature solid-phase method. The strong electronegativity of F allows the local TM-O bond to be transformed into a TM-F bond, and the TMO6 octahedron becomes more stable. The doping of Li+ not only maintains structural stability but also transforms the two-phase reaction in the high-voltage range into a solid-solution reaction. This leads to an effective suppression of the irreversible P2–O2 phase transition in the high-voltage region. At 20 mA·g–1, the initial discharge capacity of NMC-LF reaches 131.05 mAh·g–1. At a high current density of 200 mA·g–1, the discharge capacity reaches 101.9 mAh·g–1 and remains at 99.31% after 150 cycles. The diffusion coefficient of NMC-LF is as high as 8.67 × 10–13 cm2·s–1. Furthermore, the structural evolution during material formation is elaborated by high-temperature XRD, and it is determined that there are no impurities at 900 °C. Under the joint synergy of Li/F/Cu and the design of high sodium content, the long-cyclic and high-rate performance has been significantly improved. In-situ XRD tests show that Li/F/Cu codoping inhibits the P2–O2 phase transition and enhances structural reversibility. This provides a new idea for the research of layered cathode materials.

Synergistic Removal of Bromate and Ibuprofen by Graphene Oxide and TiO2 Heterostructure Doped with F: Performance and Mechanism

Yan Zhang,Jiarong Li,Hongyuan Liu

The batch experiments of photocatalytic oxidation-reduction of bromate and ibuprofen (IBP) by graphene oxide (GO) and TiO2 heterostructure doped with F (FGT) particles were conducted. The performance and mechanism of synergistic removal of bromate and IBP by FGT were discussed. The results show that a demonstrable synergistic effect and excellent removal rate of bromate and IBP by FGT were exhibited. When pH is 5.2 and the dosage of FGT is 0.1 g/L, the reaction rate constants of bromate and IBP increased from 0.0584 min-1 and 0.4188 min-1 to 0.1353 min-1 and 0.4504 min-1, respectively, compared with the degradation of bromate or IBP alone. The reaction of photocatalytic synergistic degradation is appropriately fitted through Langmuir-Hinshelwood first-order kinetics. The mechanism of synergistic removal of bromate and IBP by FGT was discussed. And electrons (e-), hydroxyl radical (⋅OH), and superoxide radical (⋅O2-) are the main active species. The electrons play a main role in the bromate reduction, and bromine is the only reduction product, while the oxidation of IBP is the result of ⋅OH and ⋅O2-, and ⋅OH plays a key role. The recombination of electrons and holes is inhibited by simultaneous consumption of bromate and IBP, which makes full use of the redox properties of FGT and plays a synergistic role in the removal of pollutants. The results indicate that photocatalytic oxidation-reduction by FGT is a promising, efficient, and environmental-friendly method for synchronous removal of combined pollution in water.

High-performance piezo-damping materials based on CNTs/BaTiO3/F-PAEK-b-PDMS under high temperature steam conditions

Xiang Yu,Yu Zhang,Lan Jin,Jingyu Chen,Zhenhua Jiang,Yunhe Zhang

Polymeric piezo-damping composites with robust piezo-damping performance under high temperature steam conditions are highly desirable. In this study, we demonstrate a novel piezo-damping material, consisting of fluorinated (polyaryletherketone)-(polydimethylsiloxane) block copolymers (F-PAEK-b-PDMS) as matrix, multi-walled carbon nanotubes (CNTs) as conductive filler, and barium titanate (BT) as piezoelectric phase. Taking the advantages of hydrophobic property of PDMS and good thermal stability of F-PAEK, piezo-damping materials exhibit good stability under high temperature steam conditions. Furthermore, for the incompatibility between F-PAEK and PDMS, microphase separation appears, which can greatly increase the friction between molecules for better damping capability. Good damping performances that loss factor > 0.3 over a broad temperature range of 55–115 °C (≈60 °C) can be achieved. Those outstanding performances can effectively broaden the practical application of piezo-damping composites under harsh conditions.

Miniemulsion polymerization-formulated poly(fluorene-alt-6-(2-ethylhexyl)-[1,2,5]thiadiazole[3,4-f]benzotriazole) for cancer cell imaging

Zhiguo He,Xuejiao Han,Hui Xie,Zifeng Yan,Bing Guo,Youwei Yao

Near-infrared (NIR) conjugated polymer nanoparticles (CPNPs) possesses advantages for bioimaging because of their merits in low autofluorescence interference, good biocompatibility, large light extinction coefficient, improved photostability, and facile functionalization capability. Different from conventional post-polymerization methods for fabricating NIR CPNPs, like nanoprecipitation, emulsion and solvent evaporation/miniemulsion, and self-assembly, herein, an efficient one-pot strategy by in-situ miniemulsion polymerization is demonstrated to synthesize CPNPs for NIR fluorescence imaging of cancer cells. Via adjusting the donor-acceptor strength , the new CP, poly(fluorene- alt -6-(2-ethylhexyl)-[1,2,5]thiadiazole[3,4- f ]benzotriazole) ( PFTA ), show absorption and emission maximum at 648 nm and 730 nm, respectively, which is much more red-shifted than its counterpart, poly(fluorene- alt -benzo-2,1,3-thiadiazole) ( PFBT ). DFT calculation demonstrates that the repeating unit of PFTA has a smaller dihedral angel to 33.2° and much reduced energy gap to 2.46 eV, as compared to that of PFBT NPs. Importantly, through controlling surfactant concentrations from 40 g·L −1 to 2.5 g·L −1 during the miniemulsion polymerization, the particles size can be accordingly changed from even 88 to 210 nm. Furthermore, the particles show extinction coefficient of 2.82 × 10 4  M −1 ·cm −1 at 648 nm, photoluminescence quantum yields c.a. 2.4% and fluorescence lifetime c.a. 1.26 ns, respectively. Moreover, the PFTA NPs exhibit biocompatibility, good colloidal stability and bright fluorescence signals to clearly pinpoint breast cancer cells, with a trend that smaller NP size, higher cellular uptake. This work demonstrates the promise of miniemulsion polymerization as a facile method to fabricate NIR CPNPs for bioimaging.

Effects of Vitamin B12 on the Reductive Transformation of PFOS and F-53B by Nanoscale Zero-Valent Zinc

Perfluorooctane sulfonate (PFOS) and 6:2 chlorinated polyfluoroalkyl ether sulfonate (F-53B) are persistent per- and polyfluoroalkyl substances of concern in aquatic environments. This study compared their anaerobic reductive transformation by nanoscale zero-valent zinc (nZn0), with and without vitamin B12 (VB12). Solutions containing 1 mg/L PFOS or F-53B were treated with nZn0(278 mg/L) and, where indicated, 0.05 mmol/L VB12 (67.8 mg/L) at pH 8.5 and 30 °C for 20 days. After correction for losses observed in reagent-free blanks, PFOS loss was negligible with nZn0alone but reached approximately 34% with nZn0+ VB12, and the corresponding defluorination rate was 33.9%. In contrast, F-53B showed approximately 85% blank-corrected loss by day 6 with either nZn0alone or nZn0+ VB12, while defluorination rates reached 38.0% and 30.7%, respectively, indicating no enhancing benefit of VB12 for F-53B under the studied conditions. Nominal-mass LC-MS/MS features consistent with partially defluorinated and hydrogen-substituted products were observed, and tentative transformation pathways were proposed. These results demonstrated compound-specific effects of VB12 and emphasized the distinction among loss, transformation and defluorination when evaluating PFAS destruction.

Enabling Sensitive and Stable X-ray Detection in a 2D Trilayered Hybrid Perovskite with Strong F–π Interactions

Peixuan Zhu,Huawei Yang,Lemei Long,Panpan Yu,Chengmin Ji,Zeng-Kui Zhu,Ying Zeng,Shihai You,Junhua Luo

Organic–inorganic hybrid perovskites integrate the advantages of organic and inorganic components, making them promising candidates for high-performance X-ray detection. However, severe ion migration under external voltage makes it a tough challenge to realize high sensitivity and operational stability simultaneously in practical application. Here, we report a two-dimensional (2D) trilayered hybrid perovskite with F-substituted aromatic spacers, (FBZA)2(MA)2Pb3Br10 (1, FBZA = 4-fluorobenzylamine, MA = methylamine). The thick inorganic slabs endow 1 with efficient carrier transport paths, achieving a superior mobility-lifetime product of 1.3 × 10–3 cm2 V–1, much higher than most of 2D perovskites. Indeed, a high sensitivity of 2818.2 μC Gy-1 cm–2 and a low detection of limit (LOD) of 43.7 nGy s–1, as well as a low dark current drift of 1.61 × 10–7 nA cm–1 s–1 V–1 under a bias of 100 V, suggests its great potential on sensitive and stable X-ray detection. The stable and reliable response to long-time X-ray irradiation of high dose rate under large working voltage further verifies its operational stability. This research develops a multilayered 2D perovskite with strong interlayer interactions, successfully achieving high-sensitivity and high-stability X-ray detection, which sheds light on the design and construction of high-performance perovskite-based X-ray detectors in the future.

Synthesis of robust superhydrophobic EP/F-CNTs/SiO2 composite coating with excellent anti-corrosion and wear-resistant property

Zhou Jie,Su Jingying,Su Fenghua,Zhao Tianxin,Li Ji,Yang Pengfei,Zhang Qingyu

At present, superhydrophobic coatings have a wide range of applications in self-cleaning, drag reduction, and corrosion protection. However, their poor mechanical stability has a significant impact on the service life and effectiveness of the coatings. In addressing this challenge, this study introduced epoxy resin (EP) with high strength and strong adhesion as the resin matrix. The composite coating, synthesized through a straightforward spraying technique, incorporates modified carbon nanotubes (F-CNTs) and hydrophobic fumed nanosilica (SiO 2 ) as fillers. The robust EP/F-CNTs/SiO 2 superhydrophobic coating exhibited excellent anti-rubbing ability and superadhesion strength, which was attributed to the EP intermediate layer significantly enhancing the adhesion strength between the coating and the stainless steel substrate with a remarkable adhesion grade of one. Tafel and EIS test results revealed a corrosion inhibition efficiency of up to 99.75% for the coating. The exceptional corrosion resistance of the coating is attributed to the outstanding electron transfer capability of F-CNTs. In addition, the coating could resist corrosion from strong acids and bases. It is believed that the facile and low-cost method offers an effective strategy and promising industrial applications for fabricating robust and super anti-corrosion superhydrophobic surfaces on various metallic materials.