ECS Journal of Solid State Science and Technology
·
2023
·Vol. 12
·期 2
·023010
·
IF 2.2
Zhentao Wang,Haisheng Zheng,Lei Zhang,Zhan Cheng,Feiwen Zhao,Ruzhong Zuo,Tianyu Li,Dong Xu
In this paper, (M0.5Ta0.5)0.05Ti0.95O2 (M = Al, Ga, In) ceramic materials were successfully prepared by Flash Sintering (FS) under an electric field of 550 V cm−1 at 1200 °C for 18 min. The influences of different ionic radius on flash sintering behavior, crystal structure, microstructure and dielectric properties of TiO2-based colossal permittivity (CP) ceramics were systematically investigated. FS can reduce the sintering temperature by 200 °C and shorten the sintering time by more than 12 times. The results show that all flash sintering samples were pure rutile TiO2 structure. The grain size decreased with increasing ionic radius. ATTO had the lowest dielectric loss of 0.2 and ITTO had a maximum dielectric constant of 8100 at 1 kHz. XPS analysis confirms that Ti3+ content increased gradually with increasing ion radius. Impedance spectroscopy analysis shows that all flash sintering ceramics were composed of semi-conductive grains and insulating grain boundaries. The CP behavior was explained using the internal barrier layer capacitance effect. This work provides a very meaningful method for the preparation of co-doped TiO2 CP ceramic materials.
研究领域:
材料科学
·
电子材料
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Chao Sun,Naiyu Guo,Li Ye,Longxin Miao,Mian Cao,Mingdie Yan,Jianjun Ding
Phenol red (PR) is generally used as an acid-base indicator and a printing and dyeing colorant. When its content exceeds a certain concentration in water, it will cause great damage to the human body. Therefore, it is very important to detect the content of PR in water. The advantage of surface enhanced Raman scattering (SERS) is detecting samples quickly, non-destructive and high sensitivity without sample pre-treatment. SERS has attracted great attention in all fields of detection and analysis. In this paper, the method of attaching silver nanoparticles to metallic single-walled carbon nanotubes form carbon nanotubes/silver nanoparticles (CNTs/AgNPs) structure and then combining it with silica sheet is proposed. SERS substrate with silica/carbon nanotubes/silver nanoparticles (SiO 2 /CNTs/AgNPs) composite structure has extremely high reinforcement effect. In the quantitative analysis of the detected substance, mathematical fitting or machine learning is used to find the relationship between the intensity of Raman signal and the concentration of the detected substance. The BP neural network optimized by genetic algorithm (GA-BP) is designed in this study. The weights of GA-BP to enhance the robustness of BP neural network, the method of adaptive learning rate and the number of hidden nodes is set to solve the problem that GA-BP is easy to fall into local optimum, thus establishing a quantitative analysis model of PR solution concentration. The model can detect different concentrations of PR solutions with high accuracy quickly, simply and sensitively. Finally, compared with other published quantitative models, GA-BP correlation coefficient R 2 determined by the training results of the model is 0.99996, and the root mean square error of the prediction is RMSEP = 0.002510, which is 0.0005 higher than the mathematical fitting method, it shows better performance. A reliable idea for the preparation of SERS substrate and online detection of PR concentration in water proposed in this study.
研究领域:
环境科学
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分析化学
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纳米材料科学
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 41
·e03562
·
IF 26.8
Shangqing Qu,Tianhao Niu,Xianji Qiao,Yanran Shen,Guohong Cai,Xiaoge Wang,Yonggang Wang,Zhipeng Zhou,Shipeng Zhang,Zeyue Zhang,Guobao Li,Guanqun Cai,Junliang Sun
Na- β ″-Al 2 O 3 is a highly promising solid-state electrolyte (SSE) for solid-state sodium batteries (SSSBs) with a wide electrochemical stability window and excellent stability against metallic sodium. However, its practical application is hindered by the instability of β ″ phase ( R 3 ¯ $\bar 3$ m ) during sintering, low polycrystalline ionic conductivity at room temperature, and poor interfacial contact with sodium anodes. In this study, a stablized SSSB is obtained via doping Ga 3+ into Na 1.67 Mg 0.67 Al 10.33 O 17 (NMAO), which also suppresses the formation of the β ′ phase ( P 6 3 / mmc ) and decreases stacking faults. After sintering at 1550 °C for 2 h, Na 1.67 Mg 0.67 Al 9.33 GaO 17 (NMA9.33GO) exhibits an ionic conductivity of 9.2 × 10 −4 S cm −1 at 30 °C, ≈1.7 times greater than NMAO. Furthermore, Ga 3+ doping enhances the wettability with sodium, achieving superior contact stability and the formation of Na-Ga alloys at the interface significantly improves electrode-electrolyte contact stability, achieving a high critical current density (CCD) of 0.8 mA cm −2 and a low interfacial impedance of 16 Ω cm 2 . A quasi-solid-state battery assembled with Na 3 V 2 (PO 4 ) 3 (NVP) as the cathode demonstrates excellent cycling stability and rate performance, retaining a high discharge capacity of 91 mAh g −1 at 5 C, and maintaining 87% capacity retention after 1000 cycles at 1 C. This work provides new insights into improving electrolyte performance and interfacial engineering through doping strategies, thereby promoting the development of efficient and long-term SSSBs.
研究领域:
材料科学
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电化学
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储能
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固态电池
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产品关联
DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2024
·
IF 6.6
Jing Kong,Jiabin Lai,Min Wang,Yi Xie,Haifei He,Jiayu Gu,Tao Pan,Zhiqiang Lu,Lifeng Jiang
Background Chemodynamic therapy (CDT) faces challenges of low catalytic ion efficiency and ROS production. We developed a ROS nano-bomb, Cu/ZIF-8@GA-Fe, to address these issues.Methods The nano-bomb was synthesized by doping copper into ZIF-8 and assembling Fe3+ and gallic acid (GA). It was tested for reactive oxygen species (ROS) generation in acidic conditions and its photothermal properties.Results In an acidic micro environment, Cu/ZIF-8@GA-Fe effectively released Fe3+ and Cu2+, depleting GSH and generating ROS. The GA-Fe coating provided photothermal heat and was used to enhance Fenton reactions via dual ions for increasing ROS production. In vivo and in vitro experiments, Cu/ZIF-8@GA-Fe inhibited tumor growth with minimal side effects.Conclusion Cu/ZIF-8@GA-Fe shows promise for safe and effective CDT, offering a synergistic approach to tumor therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2022
·
IF 5.112
Nan Jin,Ruotong Chen,Yuling Li,Ziyi Zhang,Baomei Zhang,Jianmin Chen
The aim is to achieve the targeting function of Aptamer 21-2 (Apt) by modifying glycyrrhizic acid (GA) to obtain Apt-GA and by delivering it through mesoporous silica in μm-size (μmS). Moreover, it is planned to induce synergistic effects of the novel amorphous preparation of Apt-GA with curcumin (Cur) in the treatment of psoriasis. UV/vis spectrophotometric analysis and Fourier transform infrared spectroscopy were performed to demonstrate the linkage of Apt and GA. The replacement of GA with Apt-GA in GA-Cur-μmS did not make a difference in the amorphous state, but showed superior fluorescence of Cur in the inflamed dermis similar to psoriatic induced by imiquimod. Consequently, compared to GA-Cur-μmS and Apt, Apt-GA-Cur-μmS exhibited less pronounced psoriatic characteristics in vivo , including Psoriasis Area and Severity Index, histological image, immunohistochemistry and immuno-fluorescence labeling neutrophils. The enzyme-linked immunosorbent assay showed a similar phenomenon that less IL-17A was observed after treatment with Apt-GA-Cur-μmS than with GA-Cur-μmS or Apt. Our finding suggests that this novel Apt delivery system achieved the Apt targeting function in the dermis by taking advantage of GA and μmS, and exhibited synergistic anti-psoriatic effect by co-delivering curcumin .
研究领域:
药剂学
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皮肤科
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分子生物学
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药物递送系统
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产品关联
DOI
PubMed
高影响因子
Frontiers in Plant Science
·
2018
·
IF 3.677
Li Zhan,Gao Yue,Zhang Yuchan,Lin Cheng,Gong Dongting,Guan Yajing,Hu Jin
Seed germination is a complex process controlled by various mechanisms. To examine the potential contribution of reactive oxygen species (ROS) and gibberellin acid (GA) in regulating seed germination, diphenylene iodonium chloride (DPI) and uniconazole (Uni), as hydrogen peroxide (H2O2) and GA synthesis inhibitor, respectively, were exogenously applied on tobacco seeds using the seed priming method. Seed priming with DPI or Uni decreased germination percentage as compared with priming with H2O, especially the DPI + Uni combination. H2O2 and GA completely reversed the inhibition caused by DPI or Uni. The germination percentages with H2O2 + Uni and GA + DPI combinations kept the same level as with H2O. Meanwhile, GA or H2O2 increased GA content and deceased ABA content through corresponding gene expressions involving homeostasis and signal transduction. In addition, the activation of storage reserve mobilization and the enhancement of soluble sugar content and isocitrate lyase (ICL) activity were also induced by GA or H2O2. These results strongly suggested that H2O2 and GA were essential for tobacco seed germination and by downregulating the ABA/GA ratio and inducing reserve composition mobilization mutually promoted seed germination. Meanwhile, ICL activity was jointly enhanced by a lower ABA/GA ratio and a higher ROS concentration.
研究领域:
植物生理学
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分子生物学
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植物学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Rui Geng,Xianjun Niu,Yajie Liu
HZSM-5 zeolite is extensively used in methanol-to-aromatics (MTA) reactions; however, its low aromatics selectivity limits its performance due to weak intrinsic aromatization ability. In this study, a series of bifunctional x -Ga 2 O 3 /HZSM-5 were synthesized by mechanically mixing different Ga 2 O 3 isomers with HZSM-5 to systematically investigate the influence of the crystal structure on methanol aromatization. Among them, β-Ga 2 O 3 /HZSM-5 catalyst exhibited the highest aromatic selectivity, reaching 40 mol%. Structural characterization by XRD, N 2 adsorption, XPS, H 2 -TPR, XANES, and EXAFS analyses revealed that the dispersion and reducibility of extra-framework Ga 3+ species varied with the Ga 2 O 3 structure. In particular, the monoclinic β-Ga 2 O 3 exhibited a pronounced interaction with Brønsted acid sites of HZSM-5, promoting the formation of highly active and stable four-coordinated [Ga 2 O 2 ] 2+ dimers. These species functioned as efficient dehydrogenation and cyclization centers, thereby markedly promoting aromatics production.
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6975-6985
·
IF 2.047
Ma Chaofan,Shen Jun,Tan Liming,Deng Jinzhao,Zeng Chengzong
Ga-based liquid metal (LM) with high thermal conductivity is considered to be a promising thermal interface material (TIM) for electronic thermal devices; however, its pump-out and easy oxidation hinder its popularization. Herein, fluororubber (FKM) was selected as the sealing material to prevent the pump-out of eutectic Ga-In-Sn (EGaInSn) and reduce its oxidation during long-term extreme service conditions. After being placed in an oil bath at 125°C for 4 weeks, the FKM soaked in EGaInSn could still hinder the penetration of EGaInSn and maintain good elasticity and plasticity. When EGaInSn was applied to a radiator cap as TIM, the maximum radiator temperature at full load was 47% lower than that without TIM, and 14% lower than that with commercial thermal grease. Moreover, after experiments including 1000 h of high-temperature aging, 1000 h of constant temperature and humidity, and 1000 thermal shocks, there was no pump-out or apparent oxidation in the sealing structure with FKM.
研究领域:
材料科学
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电子工程
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热管理技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Sikang Wei,Yang Xu,Shihong Tian,Zhaohui Han,Lei Xu
In this study, Al-Mg-Sn-Ga anode material prepared by heating up to 800 °C in microwave field under different powers and heating up to 800 °C in conventional field is compared. The microstructure and corrosion morphology of aluminum alloy anode are observed by electron backscatter diffraction(EBSD) and scanning electron microscopy(SEM), and Tafel polarization curve , electrochemical impedance spectroscopy (EIS) and constant current are characterized by different melting modes. The results are showed that microwave can change the grain orientation of aluminum alloy anode and corrosion forms, compared to the conventional technology, the microstructure of the alloy electrode material can grow preferentially at (001), improve alloy anode electrochemical properties , by pitting corrosion forms into a uniform corrosion , improves the corrosion resistance of the anode and the anode utilization. At the same time, aluminum alloy anode has excellent discharge performance under microwave 2000 W treatment. The energy density and capacity density are 2729.3 Wh·kg −1 and 2596.6 mAh·g −1 , respectively, which are 44.03% and 42.26% higher than those of conventional muffle furnace melting. Therefore, microwave technology can improve the electrochemical performance by affecting the microstructure of alloy materials.
研究领域:
材料科学
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电化学
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金属腐蚀与防护
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能源材料
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功能材料
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冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Bin Ma,Ke Su,Qianxin Zhang,Yunping Shi,Bowen Xiong,Xiaoqin Ma
Novel Sr 9 R(PO 4 ) 7 (R = In, Ga) host materials for Eu 3+ - doped phosphors were synthesized by a high-temperature solid-state reaction method. The crystal structure, luminescence properties and thermal stability of the phosphors were explored. The phase analysis indicated that the phosphors crystallized in monoclinic structure, the emission spectra of both In and Ga containing phosphors were mainly composed of two sharp peaks centered at about 591 and 617 nm, corresponding to the 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 transitions of Eu 3+ ions. While, the relative emission and excitation intensities of Sr 9 In(PO 4 ) 7 : Eu 3+ were weaker than Sr 9 Ga(PO 4 ) 7 : Eu 3+ . Moreover, the energy transfer mechanism among Eu 3+ ions in the phosphors depended upon energy transfer among the nearest-neighbor ions described by the Dexter theory. The selected Sr 9 In(PO 4 ) 7 : 0.06Eu 3+ and Sr 9 Ga(PO 4 ) 7 : 0.06Eu 3+ exhibited high thermal stability and the chromaticity coordinate of the phosphors were located in the red-orange light region.
研究领域:
材料科学
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发光材料
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固态化学
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光学物理
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Liwei Zeng,Jiyou Zhong,Hongyao Liu,Weiren Zhao
Herein, we report a series of tunable and highly efficient Ga 1.594-2 x Sc 0.4 Mg x Ge x O 3 :0.006Cr 3+ phosphors via regulating the crystal field environment in (Ga,Sc) 2 O 3 :Cr 3+ system. This material exhibits a gradual red-shift of the emission spectra from 784 to 814 nm, and a spectral broadening with FWHM increased from 138 nm to 169 nm as the increase of x value. However, the position of excitation peak has almost no variations in the blue light region, enabling it to be perfectly matched with blue LED chip. Upon 450 nm excitation, the IQE remains above 90% when x ≤ 0.08 (784 ≤λ em ≤ 803 nm); while the thermal stability decreases as the increase of x in the whole range. Finally, a prototype NIR pc-LED was fabricated via combining Ga 1. 35 4 Sc 0.4 Mg 0.12 Ge 0.12 O 3 :Cr 3+ phosphor with 450 nm blue LED chip, which shows an excellent NIR output power of 26.91 mW with high photoelectronic conversion efficiency of 9.70% under a driving current of 100 mA. Thus, this work provided a series of efficient NIR phosphors through local structure regulation, which may have great potential for spectroscopy application.
研究领域:
材料科学
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光学材料
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固态照明
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荧光粉化学
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发光学
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DOI
高影响因子
SENSORS
·
2017
·Vol. 17
·期 6
·1203
·
IF 2.677
Hongxiang Chen,Wei Jiang,Lianfeng Zhu,Youwei Yao
Amorphous indium gallium zinc oxide (a-IGZO) powder was prepared by typical solution-based process and post-annealing process. The sample was used as sensor for detecting C2H5OH, H2, and CO. Gas-sensing performance was found to be highly sensitive to C2H5OH gas in a wide range of concentration (0.5–1250 ppm) with the response of 2.0 towards 0.5 ppm and 89.2 towards 1250 ppm. Obvious difference of response towards C2H5OH, H2, and CO was found that the response e.g., was 33.20, 6.64, and 2.84 respectively at the concentration of 200 ppm. The response time and recovery time of was 32 s and 14 s respectively towards 200 ppm concentration of C2H5OH gas under heating voltage of 6.5 V.
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DOI
高影响因子
危险品化学品经营许可证（带存储）