JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 101
·期 1
·215-226
·
IF 2.326
Li Ping,Zhao Liuyong,Wang Song,Zhang Xiaohui,Jiang Huaiyuan,Liu Ruizhen,Zhao Nengchuang,Cheng Jian,Xu Caili,Zhao He,Lyu Renliang
Known as one efficient upconversion luminescent material, Rare-earth ions doped natrium yttrium fluoride NaYF 4 :Yb/Re has broad application prospects. However, due to the limitation of the existing preparation methods, it is difficult to realize industrial production. In this paper, the upconversion luminescence microparticles, rare earth ions doped Natrium Yttrium Fluoride NaYF 4 :Yb/Er, were synthesized productively by impinging stream method. Synthesis conditions were optimized as EDTA: Ln to 0.5 and NaF: Ln to 6 (Ln represents the sum of moles of Y, Yb, and Er), reacting temperature and time to 50 °C and 3 h to obtain a high yield of 99.92% and particle with good monodispersity. To get strong upconversion luminescence, the effect of the calcination temperature and the amount of EDTA were investigated. The bright upconversion emissions by excited with laser radiation at 975 nm were found at 510–690 nm. The higher the calcination temperature, the stronger the luminescence and the strongest luminescence occurs when calcined at 600 °C. And the adding of EDTA will decrease the luminescence intensity. However, the sintering of particles at high temperatures and aggregation of particles without EDTA are unfavorable for the application of the products. Based on the above considerations, the optimal calcination temperature was determined at 450 °C, and the ratio of EDTA: Ln is preferred at 0.5. The impinging stream method to prepare upconversion material has the advantages of being simple in the process and equipment, high in output, low in investment, and convenient to be applied and popularized.
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高影响因子
Silicon
·
2021
·Vol. 14
·期 13
·7473-7481
·
IF 2.67
Zeng Nengyuan,Zhao Hongdong,Liu Yuling,Wang Chenwei,Luo Chong,Wang Wantang,Ma Tengda
The colloidal silica is used as the abrasive for the copper Chemical Mechanical Polishing slurry in integrated circuit multilayer copper wiring. The aggregation of colloidal silica in the slurries tends to aggregate spontaneously, resulting in the continuous changes of the polishing effect, such as scratch defects, removal rate, etc. This situation can lead to the potential instability of the polishing slurry, which should be avoided in industrial production. In this paper, the aggregation and dispersion properties of polishing slurries were systematically studied, and an scheme was proposed to improve the dispersion of slurries to prevent agglomeration. These affecting factors including slurries’ pH, Potassium nitrate and Sodium Polyacrylate were assessed with Large particle counts, Zeta potential and Particle size. Slurry’s pH at 9.6 had a lower Zeta potential which meant a higher dispersion colloidal silica compared to other pH of slurries. And the dissolution of colloidal silica was verified by UV-vis experiment. Sodium dodecyl sulfate, Dodecyl trimethyl ammonium chloride and Primary Alcobol Ethoxylate-15 were analyzed for their dispersion in slurries from the point of view of static electricity and steric hindrance, and the synergistic mechanism of mixed Sodium dodecyl sulfate and Primary Alcobol Ethoxylate-15 on slurries dispersion was highlighted. In addition, the effect of the improvement of slurry dispersion on reducing scratching defects on the surface of polished copper blanket was also tested in this paper.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 51
·期 1
·232-242
·
IF 1.938
Mai Yuxiang,Du Bin,Liu Qian,Zhao Yushun,Yang Wei,Yan Bingyue
Abstract The interfacial structure between the inorganic filler and epoxy resin matrix in epoxy resin (EP) composites has a great influence on the mechanical properties, thermal conductivity, and electrical properties. In this paper, two micro@nanostructured Al 2 O 3 fillers and their epoxy resin composites were prepared, and their morphology, interfacial bond strength, mechanical properties, thermal conductivity, and electrical properties systematically tested and analyzed. The experimental results show that modification by a nano-Al 2 O 3 coating on the surface of micro-Al 2 O 3 can effectively improve the infiltration of Al 2 O 3 filler and epoxy resin, reduce the interfacial defects caused by weak bonding of Al 2 O 3 filler and epoxy resin, and thus synergistically improve the mechanical properties, thermal conductivity, and electrical properties of epoxy resin composites. The thermal conductivity was improved by 22.5% compared with 22.65% when using micro-Al 2 O 3 /EP, the tensile and flexural strength were improved by 36.67% and 20.82%, and the alternating-current breakdown strength was improved by 12.88%. In addition, thermally stimulated current experiments were carried out to study the electron transport properties of micro@nano-Al 2 O 3 epoxy resin composites, revealing that filler nanomodification could improve the trap depth, suppress the carrier transport, and improve the dielectric properties of the composites. Graphic Abstract
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 2
·331-340
·
IF 2.496
Zheng Tao,Li Meisheng,Zhou Shouyong,Zhao Yijiang,Zhong Zhaoxiang,Chen Chenglung
Two-dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets are widely used in photocatalysis, energy storage and membrane separation owing to their high specific surface area, rapid photogenic carrier migration rate and numerous active sites. In this study, high performance g-C 3 N 4 nanosheets with a particle size of about 290 nm were prepared by gas exfoliation. It was observed that the structure and properties of g-C 3 N 4 nanosheets prepared at 500 °C were superior as compared to 300 °C and 400 °C. The state of g-C 3 N 4 layers at different temperatures was also studied by molecular dynamics simulation. It was revealed that the liquid nitrogen (L-N 2 ) molecules could only penetrate the edge space between g-C 3 N 4 layers at 500 °C, however, no penetration took place in the layers. The traditional gas exfoliation mechanisms were observed to be incapable in explaining this phenomenon. Combining the experimental studies and molecular dynamics simulations, a novel gas exfoliation mechanism was proposed in this study so as to prepare few-layered g-C 3 N 4 nanosheets. Based on this, the L-N 2 molecules entered the edge space in g-C 3 N 4 layers and subsequently pushed deeper to exfoliate the nanosheets.
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高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 11
·期 1
·120-135
·
IF 6.707
Lyu Yang,Du Baihe,Chen Guiqing,Zhao Guangdong,Cheng Yuan,Zhou Shanbao,Lv Qingrong,Zhang Xinghong,Han Wenbo
To further improve the oxidation resistance of polymer derived ceramic (PDC) composites in harsh environments, C f /SiC/SiHfBOC composites were prepared by chemical vapor infiltration (CVI) and precursor impregnation pyrolysis (PIP) methods. The weight retention change, mechanical properties, and microstructure of C f /SiC/SiHfBOC before and after oxidation in air were studied in details. Microscopic analyses showed that only the interface between the ceramics and fibers was oxidized to some extent, and hafnium had been enriched on the composite surface after oxidizing at different temperature. The main oxidation products of C f /SiC/SiHfBOC composites were HfO 2 and HfSiO 4 after oxidation at 1500 °C for 60 min. Moreover, the weight retention ratio and compressive strength of the C f /SiC/SiHfBOC composites are 83.97% and 23.88±3.11 MPa, respectively. It indicates that the C f /SiC/SiHfBOC composites should be promising to be used for a short time in the oxidation environment at 1500 °C.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·
IF 2.4
Wen Xin,Wang Lei,Lai Xiao-juan,Liu Gui-ru,Yang Wen-wen,Gao Jin-hao,Liu Ya-meng
Emulsion polymerization is an effective means of synthesizing high-molecular-weight polymers in order to reduce the consumption of fossil energy. This paper adopts isoamyl octanoate to replace white oil as the continuous phase of emulsion polymerization to synthesize the high molecular weight polyacrylamide emulsion RSE. S-80 and T-80 were chosen as the emulsifiers, and the test results showed that the HLB value is 5.72 when S-80/T-80 is 6.5. When S-80/T-80 is 6.5, the HLB value is 5.72. Water and isoamyl octanoate can produce ultra-low interfacial tension and stable arrangement in the interfacial membrane to form a stable emulsion, and the particle size is uniformly distributed in a normal manner. The test of the exothermic process of polymerization shows that the emulsion can be stabilized into nuclei, and polyacrylamide polymers with a molar mass of more than 18 million are obtained. The microstructure test observes that RSE molecules are in an aggregated state in the aqueous solution. A three-dimensional spatial network structure is formed, and the polymerization can be stabilized in a three-dimensional network structure after 120 °C, 170 s −1 shear, which still has good stability. After the variable shear performance test proved that the aqueous solution of RSE belongs to the typical non-Newtonian fluids, to shock test the viscoelasticity of different concentrations of RSE polymer, G′ > G″, the RSE solution to elasticity is dominant. In this paper, the capacity to form stable emulsions of isoamyl octanoate in the emulsion polymerization process is investigated to provide a basis for seeking the selection of a continuous phase with little environmental pollution and high functionality.
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高影响因子
Journal of Animal Science and Biotechnology
·
2023
·Vol. 14
·期 1
·1-17
·
IF 7
He Zhaoqi,Zhao Caijun,He Yuhong,Liu Zhuoyu,Fan Guyue,Zhu Kun,Wang Yiqi,Zhang Naisheng,Fu Yunhe,Hu Xiaoyu
Background Mastitis is an inflammatory disease of the mammary gland that has serious economic impacts on the dairy industry and endangers food safety. Our previous study found that the body has a gut/rumen-mammary gland axis and that disturbance of the gut/rumen microbiota could result in ‘gastroenterogenic mastitis’. However, the mechanism has not been fully clarified. Recently, we found that long-term feeding of a high-concentrate diet induced mastitis in dairy cows, and the abundance of Stenotrophomonas maltophilia (S. maltophilia) was significantly increased in both the rumen and milk microbiota. Accordingly, we hypothesized that ‘gastroenterogenic mastitis’ can be induced by the migration of endogenous gut bacteria to the mammary gland. Therefore, this study investigated the mechanism by which enterogenic S. maltophilia induces mastitis.Results First, S. maltophilia was labelled with superfolder GFP and administered to mice via gavage. The results showed that treatment with S. maltophilia promoted the occurrence of mastitis and increased the permeability of the blood-milk barrier, leading to intestinal inflammation and intestinal leakage. Furthermore, tracking of ingested S. maltophilia revealed that S. maltophilia could migrate from the gut to the mammary gland and induce mastitis. Subsequently, mammary gland transcriptome analysis showed that the calcium and AMPK signalling pathways were significantly upregulated in mice treated with S. maltophilia. Then, using mouse mammary epithelial cells (MMECs), we verified that S. maltophilia induces mastitis through activation of the calcium-ROS-AMPK-mTOR-autophagy pathway.Conclusion sIn conclusion, the results showed that enterogenic S. maltophilia could migrate from the gut to the mammary gland via the gut-mammary axis and activate the calcium-ROS-AMPK-mTOR-autophagy pathway to induce mastitis. Targeting the gut-mammary gland axis may also be an effective method to treat mastitis.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 35
·期 1
·1-13
·
IF 2.8
Ding Yiwen,Ren KeJu,Zeng Zhixin,Meng Gang,Gao Rongli,Deng Xiaoling,Chen Gang,Cai Wei,Fu Chunlin,Wang Zhenhua,Lei Xiang
The potential applications of magnetoelectric composites in capacitors, sensors, memory electronic devices, and energy harvesting devices have aroused great interest due to their mutual coupling between ferroelectric and ferromagnetic phases. In this paper, BFO/CFO composite films were prepared by the sol–gel method, and the regulation of magneto-photoelectric and coupling properties of BFO/CFO films with different compositions was studied. The results show that with the increase of BFO composition, the interface between BFO layer and BFO layer also appears, the dielectric constant of the film decreases with increasing the content of BFO, and the photoelectric conversion efficiency of the film increases at first and then decreases with the increase of BFO content. When the composition is 4BFO/6CFO, the photoelectric conversion efficiency of the composite film is the highest, which is 2.02 × 10 −3 %. With the increase of CFO content, the remanent magnetization and saturation magnetization of the film increase gradually. However, when the compositions are 4BFO/6CFO and 3BFO/7CFO, their leakage current is high, resulting in the degradation of ferroelectric properties. The composition 5BFO/5CFO has the highest magnetodielectric and photo induced magnetodielectric response, the corresponding values are 2.21% and 3.88%, respectively. The magnetoelectric coupling coefficient of the film is greatly increased under the action of light, reaching 115%, which could plausibly relate to the photovoltaic effect and the photostriction effects of the film. These results may provide good guidance on designing new photoelectromagnetic detector.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·
IF 5.3
Ni Yezhou,Shi Xuan,Ma Jun,Jia Zhenhua,Qiu Hua,Chen Kunlin
Microencapsulation technology is a versatile approach that offers effective protection for core materials while also solving issues such as leakage and interface bonding. In this study, a simple yet efficient method for producing multifunctional fabric coatings has been proposed by utilizing chitosan/silica hybrid microcapsules. The synthesis of the microcapsules was achieved through a combination of the single condensation method and the sol-gel method. These microcapsules were specifically designed to encapsulate octadecane and paraffin. The microcapsules were structured with a core-shell configuration, and the shell was functionalized with both fluoroalkyl silane (FAS) and choline phosphate (CP) grafts. The resulting microcapsules were added to silicone resins to produce multifunctional fabric coatings. The desired coatings improved the hydrophilic and hydrophobic properties of the fabrics, with a hydrophilic side contact angle of less than 10 ° and a hydrophobic side contact angle of up to 156 °. In addition, compared with untreated fabrics, coated fabrics can achieve a temperature difference of over 6 °C, demonstrating certain thermal insulation properties. Moreover, the coated fabric exhibits excellent antibacterial properties, with an inhibition rate of over 98% against Escherichia coli and Staphylococcus aureus . The proposed method provides a promising solution for developing advanced multifunctional fabrics with enhanced properties. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Zhili,Jiang Tianxiang,Huo Hanxin,Zhang Yizhong,Wang Xunliang,Guo Jian,Ma Yuhui
The facile fabrication of low-cost adsorbents possessing high removal efficiency and convenient separation property is an urgent need for water treatment. Herein, magnetic activated carbon was synthesized from spent coffee grounds (SCG) by Fe-catalyzed CO 2 activation at 800 °C for 90 min, and magnetization and pore formation were simultaneously achieved during heat treatment. The sample was characterized by N 2 adsorption–desorption, XRD, VSM, SEM, and FTIR. Batch adsorption experiments were conducted using lomefloxacin (LMO) as the probing pollutant. Preparation mechanism was revealed by TG-FTIR and XRD. Experimental results showed that Fe 3 O 4 derived from Fe species can be reduced to Fe by carbon at high temperatures, followed by subsequent reoxidation to Fe 3 O 4 by CO 2 , and the redox cycle between Fe and Fe 3 O 4 favored the formation of pores. The promotion effects of Fe species on CO 2 activation can be quantitatively reflected by the yield of CO as the signature gaseous product, and the suitable activation temperate range was determined to be 675 to 985 °C. The BET surface area, total pore volume, and saturated magnetization value of the product were 586 m 2 g −1 , 0.327 cm 3 g −1 , and 11.59 emu g −1 , respectively. The Langmuir model was applicable for the adsorption isotherm data for LMO with the maximum adsorption capacity of 95 mg g −1 , and thermodynamic analysis revealed that the adsorption process was endothermic and spontaneous. This study demonstrated that Fe-catalyzed CO 2 activation was an effective method of converting SCG into magnetic separable adsorbent for LMO removal from aqueous medium.
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PubMed
高影响因子
FIBERS AND POLYMERS
·
2023
·
IF 2.5
Lei Chenghu,Fang Yinchun,Liu Xinhua
Nylon fabric possesses high strength, good resilience, abrasion resistance and moisture absorption which is widely used as the textile materials. However, there are some potential safety risks due to its high flammability, poor heat and light stability, and melt-dripping phenomenon during combustion. In this paper, nylon fabric was multifunctional modified by bio-based tannic acid (TA) and phytic acid (PA) to obtain flame retardancy, ultraviolet protection and antibacterial properties simultaneously. The multifunctional coating was constructed on nylon fabric using the simple finishing method. The limiting oxygen index (LOI) of treated nylon fabric significantly increased to 39%, and its dripping was completely eliminated, showing excellent flame retardancy and anti-dripping property. In order to improve the washing durability of the multifunctional coating, polyethyleneimine (PEI) was introduced to form covalent and ionic bonds with TA, PA and nylon fabric to enhance the interfacial binding strength. After four times washing, the LOI value of treated fabric was still higher than 29% showing good washing durability. The antibacterial rates of treated nylon fabric against E. coli and S. aureus were higher than 99%. And the ultraviolet protection factor (UPF) value of treated nylon fabric increased from 12.105 to 264.82, showing excellent antibacterial and ultraviolet protection properties. This research provides the experimental basis for multifunctional modification of textile fabrics by using bio-based compounds. Graphical Abstract
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高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 1
·1-17
·
IF 21.8
Wang Qiuyang,Wang Lanlan,Liu Xinyun,Chen Haojun,Wang Xucai,Wang Peng,Wang Weijun,Jiang Qing
Prosthetic joint infection (PJI) presents a significant medical challenge, with current surgical and antibiotic strategies often limited by high recurrence rates, the need for multiple interventions, and rising antibiotic resistance. This study introduces vancomycin-loaded magnetic iron oxide nanoparticles (IONPs) incorporated into ZIF-8-based nanocomposites, termed Van-IONPs@ZIF-8, designed to deliver antibiotics directly to the PJI infection site under an external magnetic field (MF) for targeted antibacterial therapy. The Van-IONPs@ZIF-8 demonstrated excellent pH sensitivity, in vitro biocompatibility, and marked antibacterial efficacy against Staphylococcus aureus . When subjected to an external MF, these magnetic nanocomposites effectively localized at infection sites. In vivo results indicated that the Van-IONPs@ZIF-8 + MF treatment significantly reduced bacterial loads on implants, decreased blood leukocyte counts, and mitigated inflammatory cell infiltration in surrounding tissues compared to controls. Concurrently, a marked reduction in both the number of pro-inflammatory cells and the levels of pro-inflammatory cytokines was observed, alongside a corresponding increase in inflammatory repair cells and reparative cytokines within the local tissues surrounding the infected implants. Thus, Van-IONPs@ZIF-8, in conjunction with an external MF, facilitates precise targeting of local infection sites and promotes rapid vancomycin release, representing a promising strategy for the safe and effective treatment of PJI.
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高影响因子
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