NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 28
·12201-12207
·
IF 3.288
Yan Qiao,Xionglin Zhou,Hongchao Geng,Leilei Sun,Deshuai Zhen,Qingyun Cai
A β-NaYF4:Yb,Er,Gd nanorods@1T/2H-MoS2 nanocomposite was fabricated and used for photocatalytic sterilization under illumination from single near-infrared (NIR) light. Approximately 99.3% of Escherichia coli were killed effectively by 15 min irradiation of NIR light at a dose of 40 μg mL−1. The effective bactericidal activity is ascribed to the high upconversion luminescence efficiency of β-NaYF4:Yb,Er,Gd and the layered two-dimensional nanosheet structure of 1T/2H-MoS2. Under 980 nm light irradiation, β-NaYF4:Yb,Er,Gd emits visible light, which is absorbed by MoS2, producing strongly oxidative holes and reductive electrons. Photogenerated electron–hole pairs were able to react with H2O, O2 and OH− to produce reactive species in aqueous solution. These reactive species are strong nonselective oxidizing agents for sterilization.
研究领域:
材料科学
·
纳米技术
·
光催化
·
细菌学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
H. Chai,R. Li,L. Gao,H. Niu,J. Jin
The phase interface properties of the p-n junction may profoundly affect its photoelectrochemical (PEC) water oxidation performance. Here, we introduced a non-conjugated polymer functional layer (poly(diallyl-dimethylammonium chloride, PDDA) between the interfaces of the p-n junction (Co 3 O 4 /Gd–Fe 2 O 3 ) to tune the interfacial properties . First, the PDDA modulates the band structure so that the composite photoanode (Co 3 O 4 /PDDA/Gd–Fe 2 O 3 ) has an enlarger band bending than the p-n junction. Then, PDDA passivates the surface trap, which synergizes with Co 3 O 4 to provide more active sites for water oxidation. Furthermore, PDDA improves the PEC water oxidation kinetics. Specifically, PDDA extracts holes and adsorbs water oxidation reactants, thus it efficiently transfers photogenerated holes to Co 3 O 4 , promoting the water oxidation reaction in the positive direction. With these positive modulations, PDDA can further enhance the PEC water oxidation performance of the p-n junction. This conceptual work provides insight into the role of the non-conjugated polymer in PEC water splitting .
研究领域:
材料科学
·
光电化学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ke Wang,Jiaqi Yang,Bo An,Qin Zhang,Dongxing Song,Yongqing Wang
This study utilizes the citric acid-EDTA combustion method to synthesize Gd 0.1 Ce 0.9-x Ge x O 1.95 (x = 0.005,0.01,0.04,0.07), marked as nGGDC (n = 0.5,1,4,7), and Gd 0.1 Ce 0.9 O 1.95 (10GDC) composite materials, focusing on electrochemical performance and mechanical properties. The prepared materials all form a cubic fluorite structure. Doping with Ge 4+ increased the densification of the electrolyte, enlarged the grain volume, and reduced the number of grain boundaries, thereby enhancing the dielectric constant. This improvement reduces intragranular resistance and grain boundary resistance, promoting the migration of oxygen ions . The Scavenging Ratio (SR) of Gd 0.1 Ce 0.89 Ge 0.01 O 1.95 (1GGDC) is the highest, reaching 4.1 at 975 K, and the Blocking Factor (∂ t ) of 1GGDC decreases by 52 % compared to 10GDC . 1GGDC exhibits the highest conductivity and the lowest activation energy , increasing by 424 % and decreasing by 20 % compared to 10GDC , respectively. In terms of mechanical properties, compared to 10GDC, 1GGDC samples exhibit improved hardness (10.85 GPa), fracture toughness (3.18 MPa m ½ ), and flexural strength (97.62 MPa). Electrolyte single cells containing 1GGDC demonstrate higher power density and current density, particularly at 1023 K (955 mW/cm 2 vs. 740 mW/cm 2 for 10GDC). According to density functional theory calculations, the oxygen vacancy formation energy, binding energy, and migration barrier of GGDC electrolyte co-doped with Ge and Gd are all lower than those of GDC. Therefore, 1GGDC can be considered as a potential intermediate-temperature solid oxide fuel cells (IT-SOFCs) electrolyte material.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuopan Dun,Siqi Zhang,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) onto photoanode films is an effective way to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). In this contribution, the β -NaYGdF 4 :Yb, Er UCNPs and β -NaYGdF 4 :Yb,Er@SiO 2 nanoparticles (NPs) were prepared by tuning the dopant contents of the Gd ions and the β -NaYGdF 4 :Yb,Er@SiO 2 NPs were applied as an upconverting layer in DSSCs. Upconversion photoluminescence indicates that the UCNPs doped with 5% Gd ions exhibit the strongest green and red fluorescence emissions . Moreover, the DSSCs device incorporating the NPs with 5% Gd ion dopant can achieve an optimal photovoltaic efficiency of 5.89%, which is 20.20% enhancement in comparison to the device without NPs and 16.17% increasement with respect to the device containing β -NaYF 4 :Yb,Er@SiO 2 nanocrystals , thus highlighting the effect of the doping of the Gd ions in nanoparticles on their upconversion photoluminescence and photoelectric performance. Accordingly, the current results offer a feasible strategy for further regulating the photoluminescence property of UCNPs and optimizing the photovoltaic performance of UCNPs-based DSSCs devices.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光电
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 6
·5569-5576
·
IF 1.338
Li Qinqin,Li Chenglin,Tong Weijun
Here, a novel poly(lactic-co-glycolic acid) (PLGA)-based nanoparticles (NPs) for magnetic resonance (MR) and fluorescence imaging was developed for cell imaging. PLGA NPs loaded with fluorescent dye Nile red (NR) and surface-coated with poly(ethyleneimine) (PEI) were produced in a single
step nanoprecipitation process. Diethylenetriamine pentaacetic dianhydride (DTPA) was conjugated to PLGA/NR@PEI NPs through amidation reaction between –COOH of DTPA and –NH2 of PEI, which can chelate gadolinium (Gd3+) as an MR imaging contrast agent. The PLGA/NR@PEI-DTPA-Gd
NPs exhibited a uniform particle size of ∼200 nm and were stable in culture medium. These NPs had a high T
1 relaxivity (R
1) of 28.36 mM−1S−1. They did not introduce serious cytotoxicity against A549 lung cancer cells.
Furthermore, fluorescence and MR imaging studies on A549 lung cancer cells in vitro revealed that PLGA/NR@PEI-DTPA-Gd NPs can serve as an efficient fluorescence/MR dual-modality imaging nanoprobe.
研究领域:
纳米技术
·
生物医学工程
·
材料科学
·
医学成像
·
癌症研究
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2021
·Vol. 11
·期 2
·184
·
IF 4.146
Huang Zhou,Fengjiao He
β-NaYF4:Yb,Er,Gd fluorescent nanorods were successfully coupled to a reduced TiO2(UCNPs@R-TiO2) nanocomposite and applied to visible-light catalytic sterilization under 980 nm near-infrared (NIR) light illumination. The UCNPs (β-NaYF4:Yb,Er,Gd) absorb the NIR light and emit red and green light. The visible light can be absorbed by the R-TiO2(Eg = 2.8 eV) for the photocatalytic reaction. About 98.1% ofEscherichia coliwere effectively killed upon 12 min of NIR light irradiation at a minimum inhibitory concentration (MIC) of 40 μg/mL UCNPs@R-TiO2nanocomposite. The bactericidal properties were further evaluated by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. We found that the high bactericidal activity was due to the synergistic effect between the UCNPs and R-TiO2. Moreover, the UCNPs show excellent upconversion luminance properties, and the introduction of visible-light-absorbed R-TiO2nanoparticles (2.8 eV) was conducive to the efficient separation and utilization of photogenerated electron-hole pairs.
研究领域:
材料科学
·
微生物学
·
光化学
✓ 已验证
DOI
高影响因子
Materials Express
·
2023
·Vol. 13
·期 11
·1915-1921
·
IF 0.7
Chen Sihan,Hu Huiqi,Jiang Wenting,Zhang Yuyun,Luo Xiaohu,Peng Jiayi,Li Le,Zhen Deshuai,Wang Hanqing
A novel near-infrared induced upconversion sensor for the detection of uranyl ions was successfully constructed using β-NaYF4: Yb, Tm, Gd upconversion nanoparticles (UCNPs) and specific DNAzyme. Characterization of the UCNPs@DNAzyme was conducted using XRD, TEM, FT-IR and
fluorescence testing, and it was shown that the β-NaYF4: Yb, Tm, Gd nanoparticles were successfully prepared (∼27 nm). Upon 980 nm excitation, the UCNPs@DNAzyme emitted green light at λ=475 nm. Furthermore, Förster resonance energy transfer was observed between
the UCNPs@DNAzyme (doner) and uranyl (acceptor) present on the substrate chain. This resulted in fluorescence quenching, which was used to quantify the concentration of uranyl. The developed method was found to be highly selective and sensitive, with a detection limit as low as 43 nM. This
method also demonstrated excellent specificity and sensitivity for the determination of uranyl in water samples, indicating its potential application in near-infrared fluorescence detection and imaging of uranyl in vivo.
研究领域:
分析化学
·
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 11
·1801-1814
·
IF 11.534
Cheng Fuhao,Zhang Fengnian,Liu Yufeng,Guo Meng,Cheng Chufei,Hou Jiadong,Miao Yang,Gao Feng,Wang Xiaomin
Environmental barrier coatings (EBCs) with excellent chemical resistance and good high-temperature stability are of great significance for their applications in next-generation turbine engines. In this work, a new type of high-entropy fluorite-structured oxide (Ce 0.2 Hf 0.2 Y 0.2 Pr 0.2 Gd 0.2 )O 2− δ (HEFO-1) with different Ti 4+ contents were successfully synthesized. Minor addition of Ti 4+ could be dissolved into a high-entropy lattice to maintain the structure stable, effectively reducing the phase formation temperature and promoting the shrinkage of bulk samples. Heat treatment experiments showed that all the samples remained a single phase after annealing at 1200–1600 °C for 6 h. In addition, high-entropy (Ce 0.2 Hf 0.2 Y 0.2 Pr 0.2 Gd 0.2 Ti 0.2 x )O 2− δ demonstrated great resistance to calcium—magnesium—alumina—silicate (CMAS) thermochemical corrosion. When the content of Ti was increased to x = 0.5, the average thickness of the reaction layer was about 10.5 after being corroded at 1300 °C for 10 h. This study reveals that high-entropy (Ce 0.2 Hf 0.2 Y 0.2 Pr 0.2 Gd 0.2 Ti 0.2 x )O 2− δ is expected to be a candidate for the next-generation EBC materials with graceful resistance to CMAS corrosion.
研究领域:
材料科学
·
涂层
·
高温材料
·
腐蚀抗性
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Leilei Yin,Yuyan Liu,Shuai Zhang,Jin-Cheng Liu,Yong Jiang,Yaping Du
Excessive adsorption of oxygen-containing intermediates during oxygen reduction reactions (ORR) on palladium (Pd)-based materials is a critical factor limiting their catalytic activity. Alloying presents a powerful strategy to overcome this inherent challenge. In this study, the alloying of the low electronegativity lanthanide gadolinium (Gd) with Pd is explored. Pioneering theoretical calculations indicate that Gd, acting as an electron donor, induces charge redistribution between the metals. This process weakens the over-adsorption of OH* intermediates on the Pd surface and reduces the reaction overpotential. Subsequent experiments yield Pd 3 Gd solid-solution nano-alloys supported on conductive carbon black (Pd 3 Gd/C-600), resulting in a 30 mV enhancement in half-wave potential and a 4.5 fold increase in mass activity in an alkaline medium compared to Pd/C-600. Due to its superior performance in ORR, Zn-air batteries utilizing Pd 3 Gd/C-600 cathodes demonstrate remarkable peak power density and stability over 330 h. This study offers valuable insights into the rational design of rare earth alloys and their catalytic chemistry in ORR.
研究领域:
电催化
·
材料科学
·
能量存储与转换
·
纳米材料
·
稀土合金
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 3
·2288-2299
·
IF 8.897
Du Yan,Liu Di,Sun Mingchen,Shu Gaofeng,Qi Jing,You Yuchan,Xu Yiting,Fan Kai,Xu Xiaoling,Jin Feiyang,Wang Jun,Shen Qiying,Zhu Luwen,Ying Xiaoying,Ji Jiansong,Wu Liming,Liu Daren,Du Yongzhong
Hepatocellular carcinoma (HCC) is a life-threatening disease for which there is no effective treatment currently. Novel theranostics simultaneously having excellent imaging and therapeutic functions are highly desired in cancer therapy. Herein, we develop the sialic acid (SA) modified polymeric micelles at an upper critical solution temperature (UCST) of 43 °C (sialic acid-polyethylene glycol)-poly(acrylamide- co -acrylonitrile), SA-PEG-p(AAm- co -AN)), which further encapsulated with doxorubicin (DOX) and Gd-CuS nanoparticles (Gd-CuS NPs) for chemo-photothermal treatment of HCC guided by magnetic resonance (MR)/photoacoustic (PA) dual-mode imaging. The resultant SA-PEG-p(AAm- co -AN)/DOX/Gd-CuS (SPDG) had an excellent photothermal conversion efficiency, enabling SPDG with an instantaneous release behavior of DOX under near-infrared (NIR) irradiation. This study also revealed that SPDG could actively target to HCC, which was due to that SA had a high affinity with E-selectin overexpressed at the tumor site. Moreover, benefiting from the HCC-targeted ability and NIR light-controlled on-demand delivery of DOX, SPDG showed a superior potential in MR/PA dual-mode imaging-guided chemo-photothermal treatment. Overall, our study reveals that the designed SPDG may be used as an ideal multifunctional nanoplatform for cancer theranostics.
研究领域:
生物医学工程
·
纳米技术
·
癌症治疗
·
分子成像
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2024
·
IF 6.6
Longjiang Zhou,Haitao Xiang,Susu Liu,Honglin Chen,Yuanwei Yang,Jianyong Zhang,Wei Cai
Purpose Hypoxia is often associated with glioma chemoresistance, and alleviating hypoxia is also crucial for improving treatment efficacy. However, although there are already some methods that can improve efficacy by alleviating hypoxia, real-time monitoring that can truly achieve hypoxia relief and efficacy feedback still needs to be explored.Methods AQ4N/Gd@PDA-FA nanoparticles (AGPF NPs) were synthesized using a one-pot method and were characterized. The effects of AGPF NPs on cell viability, cellular uptake, and apoptosis were investigated using the U87 cell line. Moreover, the effectiveness of AGPF NPs in alleviating hypoxia was explored in tumor-bearing mice through photoacoustic imaging. In addition, the diagnosis and treatment effect of AGPF NPs were evaluated by magnetic resonance imaging (MRI) and bioluminescent imaging (BLI) on orthotopic glioma mice respectively.Results In vitro experiments showed that AGPF NPs had good dispersion, stability, and controlled release. AGPF NPs were internalized by cells through endocytosis, and could significantly reduce the survival rate of U87 cells and increase apoptosis under irradiation. In addition, we monitored blood oxygen saturation at the tumor site in real-time through photoacoustic imaging (PAI), and the results showed that synergistic mild-photothermal therapy/chemotherapy effectively alleviated tumor hypoxia. Finally, in vivo anti-tumor experiments have shown that synergistic therapy can effectively alleviate hypoxia and inhibit the growth of orthotopic gliomas.Conclusion This work not only provides an effective means for real-time monitoring of the dynamic feedback between tumor hypoxia relief and therapeutic efficacy, but also offers a potential approach for the clinical treatment of gliomas.
研究领域:
癌症研究
·
纳米技术
·
诊疗一体化
·
生物医学工程
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Fei-Fei Lu,Jia-Hong Li,Qi Ma,Changjiu Li,Venkataraman Thangadurai,Chengxin Li
Metal-supported solid oxide fuel cells (MS-SOFCs) exhibit numerous advantages, including thermal cycle stability, rapid start-up and lower costs. However, the slow oxygen reduction reaction (ORR) at the cathode, especially at intermediate-low temperatures, poses a critical challenge to the development of MS-SOFCs. Here, we report a synergistic effect of co-doping in a cation-ordered double perovskite type material, Sm(Ba0.5Sr0.5)Co2-xFexO5+δ (SBSCFx), which has enhanced catalytic activity for ORR and chemical compatibility with Ce0.9Gd0.1O2-δ (GDC). X-ray photoelectron spectroscopy and thermogravimetric analysis were used to examine how Fe-doping in SBSCFx impacts the functional properties. A composite cathode with GDC was further prepared to enhance thermal compatibility with GDC, which effectively reduces the thermal expansion of the SBSCFx cathode from 23.35×10-6 K-1 to 15.04×10-6 K-1. The electrochemical results of symmetrical cells and the DRT fitting analysis demonstrate that the SBSCFx-GDC composite cathode exhibits strong ORR activity. Notably, the SBSCF10-GDC composite cathode achieves a remarkably low polarization resistance of 0.05 Ω·cm² at 650°C. The metal-supported single cell with SBSCF10-GDC cathode exhibited an open-circuit voltage of 0.85 V and showed a peak power density of 833 mW cm-² at 650℃. Furthermore, its stability during long-term cell operation highlights its potential as a cathode for intermediate-low temperature metal-supported SOFCs.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）