CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
You Li,Sai Xu,Yuefeng Gao,Yongze Cao,Xizhen Zhang,Hongquan Yu,Yichao Wang,Tianshuo Liu,Baojiu Chen
The intrinsic challenge to thermally responsive photoluminescent materials is pertaining to the limited thermal stability and reproducibility. Most prevailing photoluminescent agents suffer from constraints imposed by their frail chemical structure , rendering them fail to work at elevated temperatures for a long time. This inherent limitation curtails their utility within domains in anti-counterfeiting and encoded information storage. Herein, a series of double perovskite Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors were synthesized using the high-temperature hydrothermal method . Upon ultraviolet light illumination, the blue emission band of self-trapped excitons (STEs) and intrinsic emissions of Ln 3+ are observed. In light of the variations in thermal quenching levels of the two emission centers and the effect of temperature on the lifetime of Ln 3+ , multi-mode thermometers with superior sensitivity are established. Moreover, they also can be used in anti-counterfeiting and encoding information storage, relying on the significant temperature-dependent color variation, excellent thermal stability and repeatability. The unique thermochromic properties and satisfactory stability of Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors bring forward a new concept of developing multi-mode thermometers and reliable information encryption systems with the application of thermochromic materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyi Li,Jing Li,Xingqi Han,Daoxiong Wu,Tianjiao Wang,Wenjuan Shi,Zhenye Kang,Xinlong Tian,Weiting Yang,Yuliang Yuan
The lattice oxygen mechanism (LOM) is recognized as a kinetic-favored pathway for oxygen evolution during water oxidation. However, the imbalance between lattice oxygen consumption and regeneration limits the long-term stability and lifespan of electrocatalysts. In this study, we present a CoFeHoO catalyst characterized by enhanced OH adsorption at oxygen vacancy sites, which facilitates the regeneration of lattice oxygen and consequently improves durability. Using isotope-labeled ( 18 O) in situ differential electrochemical mass spectrometry (DEMS), pH-dependent oxygen evolution kinetics, and TMA + probing, we demonstrate that the incorporation of Ho into CoFe oxyhydroxide enhances oxygen regeneration during the LOM cycle. In situ Fourier-transform infrared spectroscopy (FT-IR) and density functional theory (DFT) calculations further confirmed the improved OH adsorption energy at the oxygen vacancy sites on the CoFeHoO slab. This work offers a rational design strategy for developing highly efficient LOM-based electrocatalysts.
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2013
·
IF 1.88
Weimin Du,Guoyan Zhao,Hongxun Chang,Fei Shi,Zhaoqiang Zhu,Xuefeng Qian
With the help of sol–gel method assisted by melting salt, a series of Ho–Zr–O nano-composite with controllable composition and defects have been successfully prepared. Characterization results show that the positions, intensity, and width of the X-ray diffraction peaks of the products have a regular variation with the increase of zirconium element which implies the gradual changes of crystal spacing and product size. At the same time, the molar ratios between holmium and zirconium ions are consistent with the chemical formula and both of them are uniformly distributed in products further showing the perfect formation of targeted materials. Optical properties reveal that diversified defect forms of Ho–Zr–O nano-composite lead to the different absorptions of visible light . Photocatalytic experiments demonstrate Zr 0.8 Ho 0.2 O 2 − δ nano-crystals have excellent visible-light-responsive photocatalytic activities on some familiar dyes (e.g.: methylene blue and Rhodamine B) which results from the special defect structure , better absorption of visible light and larger specific surface area . It follows that Zr 0.8 Ho 0.2 O 2 − δ nano-crystals are a new kind of visible-light-responsive photocatalysts with better prospects in conversion and utilization of solar energy. Also, the present melting salt assisted route might be generalized to synthesize other AxByOz composite oxide nano-crystals with more complicated structures.
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2016
·Vol. 23
·期 10
·2423-2431
·
IF 5.771
Yike Fu,Chao Fang,Zhaohui Ren,Gang Xu,Xiang Li,Gaorong Han
Light-responsive and photoluminescent (PL) drug-delivery platforms have sparked fascinating advancements in personalized tumor chemotherapy due to their unique characteristics in biological imaging and manipulated release kinetics. Herein, implantable Yb 3+ and Ho 3+ co-doped strontium titanate (SrTiO 3 :Yb,Ho) nanofibers were synthesized and decorated on the surface with polyacrylic acid (PAA) molecules. The preliminary in vitro assay confirmed that this implantable fibrous mesh presented sound cytocompatibility. The PAA surface decoration improved the loading capacity of an anticancer drug (doxorubicin (DOX)) and effectively prevented a daunting burst release in a neutral aqueous environment. Owing to the electrostatic bond between PAA and DOX molecules, low-pH microenvironments and NIR ( λ =808 nm) irradiation both induced significantly accelerated DOX release and consequently enhanced the local cancer-cell-killing effect. Additionally, the ratio of green-to-red emission ( I 545 / I 655 ) from the SrTiO 3 :Yb,Ho-PAA fibers responded effectively to the DOX release progress and dosage due to a fluorescence resonance energy transfer (FRET) effect. This unique characteristic enabled optical monitoring of the delivery progress in a timely manner. These SrTiO 3 :Yb,Ho-PAA nanofibers, with precise dual-triggering and optical monitoring of DOX release, are expected to serve as a new implantable drug delivery platform for personalized chemotherapy in the future. Graphical Rule with a rod : Implantable polyacrylic acid (PAA)-modified SrTiO 3 :Yb,Ho nanofibers were synthesized. Owing to electrostatic bonding between the PAA and DOX molecules (see figure), low pH and NIR ( λ =808 nm) irradiation both induced accelerated DOX release and consequently enhanced the local cancer-cell-killing effect. The ratio of green-to-red emission from the nanofibers responded effectively to the DOX release progress and enabled dosage monitoring.
研究领域:
材料科学
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纳米医学
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药物递送系统
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生物医学工程
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癌症治疗
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Xiyu Li,Qin Zou,Jiawei Wei,Wei Li
Scaffold degradation regulation has become the key aspects in promoting bone regeneration and reconstruction. In the study, a novel stepwise-degraded PLGA/PCL/HA:Yb/Ho/Zn (PPHZ) scaffold was designed to compare with the fast-degradable PLGA/HA:Yb/Ho/Zn (PLHZ) scaffold to investigate the effects of scaffold degradation regulation on osteogenesis and to trace the scaffold degradation process. Micro-CT reconstruction, confocal fluorescence imaging, and histological sections were used for the analyses of the harvested animal samples, which demonstrated that the degradation regulated stepwise-degraded PPHZ scaffold maintaining higher mechanical strength and longer scaffold integrity is more advantageous for in vivo osteogenesis than the fast-degradable PLHZ scaffold. Meanwhile, the multifunctional HZ particles would help the anti-infection and tracking the distribution during scaffold degradation. The PPHZ scaffold may benefit future repair of anti-infective bone defects and in vivo multimodal tracking.
研究领域:
生物医学工程
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组织工程
·
生物材料科学
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骨科研究
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产品关联
DOI
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Liu Peng,Ren Weijun,Guo Qing,Zhang Zhao,Zhao Xueting,Zhang Zhidong,Dai Wei,Li Bing
Cryogenic refrigeration technology based on magnetocaloric effects plays a critical role in a variety of technological applications. In this paper, we report the cryogenic magnetocaloric effects of a series of sodium-rare earth fluoride samples (Ln = Gd, Tb, Dy, Ho, Er, Tm, Yb) synthesized by the solid-state reaction method. These compounds all crystallize in a hexagonal crystal structure. Down to 2 K, no magnetic ordering was detected, while all compounds show negative Curie–Weiss temperatures indicative of strong antiferromagnetic coupling. Magnetic fields effectively suppress the magnetic fluctuations, leading to a maximum magnetic entropy change of −56 J kg −1 K −1 in NaGdF 4 at the magnetic field change from 0 to 50 kOe. These series of compounds are potentially excellent magnetic refrigerants at low temperatures.
研究领域:
物理学
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材料科学
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 9
·2173-2183
·
IF 2.41
Guo Fengying,Li Ruiqing,Xu Jijing,Zou Lianchun,Gan Shucai
The Gd-, Tb-, and Ho-doped W-type hexagonal ferrite Ba 0.85 RE 0.15 Co 2 Fe 16 O 27 was fabricated by a facile route of low-temperature sol–gel self-propagating combustion. Furthermore, a combination of dielectric loss phase polyaniline and magnetic loss phase Ba 0.85 RE 0.15 Co 2 Fe 16 O 27 as the microwave absorber in a core-shell architecture has been synthesized. The effect of different lanthanide ions Gd, Tb, and Ho on their microstructure, static magnetic properties, electromagnetic properties, and microwave reflection loss have been systematically studied. Our results show that the Ho-doped ferrite has the low microstructure parameters ( a , c , and V ) and high saturation magnetization ( Ms ) attributed to its ionic radius and magnetic moment. Moreover, it was found that the Ho-doped composite exhibited excellent microwave absorbing property with a minimum reflection loss (RL) of about −15.1 dB at 9.4 GHz. The reflection loss of composite increases up to almost triple upon the combination of polyaniline and doped ferrite. Such lightweight and highly effective absorbers via combining the organic and inorganic phase into a core-shell architecture are highly desirable for microwave absorber in various applications.
The synthesis and properties of the PANI/REBF composites
研究领域:
材料科学
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电磁学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 31
·42676-42688
·
IF 7.8
Zheng Jingxuan,Zheng Xiaoping,Shu Yafeng,Liu Yiwen,Liu Jitao,Tian Jianke,Meng Zhaocang,Zhang Xue,Qi Panli,Zhang Juan,Wang Canglong
Selective emitters with high spectral efficiency and structural stability are essential for efficient thermophotovoltaic systems. However, achieving simultaneous spectral matching and simplified fabrication remains a significant challenge. In this study, a series of selective emitters Ho(Ta 1− x Nb x )O 4 were prepared via the straightforward solid-state reaction of Ho 2 O 3 and Ta 2 O 5 . First-principles calculations were performed in order to further tune the electronic structure and optical bandgap of HoTaO 4 . Experimental results revealed that Nb 5+ induced lattice distortion and symmetry reduction, effectively narrowing the bandgap and enhancing the Ho 3+ 4f-4f electronic transitions. The optimized emitter exhibited a spectral efficiency of 47.59% at 1573 K, a peak power density of 9.65 W cm −2 , and a figure of merit of 28.02% when paired with InGaAsSb cells (1.8−2.5 μm). Furthermore, the emitters demonstrated reduced thermal conductivity (3.74 W m −1 K −1 ) and suppressed grain growth ( k p = 0.0451 μm 2 h −1 ), ensuring excellent microstructural stability under extreme thermal conditions. This work provides a strategy for designing high-performance selective emitters for advanced energy conversion and industrial waste heat recovery.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhuang Tian,Hongquan Yu,Zhanwen Han,Zhipeng Guan,Sai Xu,Jiashi Sun,Yongze Cao,Yichao Wang,LiHong Cheng,Baojiu Chen
One-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructures , including nanowires, nanotubes , and wire-in-tube architectures, were fabricated via a simple electrospinning technique using a single-nozzle system. The diameters of Y 2 Ti 2 O 7 :Ho/Yb nanowires are between 180 and 200 nm. The Y 2 Ti 2 O 7 :Ho/Yb nanotubes have an outer diameter of 180 nm and a wall thickness of 30–40 nm. In the Y 2 Ti 2 O 7 :Ho/Yb wire-in-tube architectures, the outer diameter of tubes, wall thickness of tubes, and diameter of wire are 180–190, 25–30, and 30–35 nm, respectively. The electrospinning process's environment humidity considerably influences the one-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructure morphology. Further, the upconversion luminescence properties and temperature sensitivity of the one-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructure were investigated compared with that of the Y 2 Ti 2 O 7 : Ho/Yb bulk prepared via solid-state reactions. Furthermore, to realize their dual-mode anticounterfeiting function, the Y 2 Ti 2 O 7 :Ho/Yb nanotubes were coated with a rare-earth nitrate (RE (NO 3 ) 3 ) using a homogeneous precipitation technique to obtain core-shell structure nanotubes of Y 2 Ti 2 O 7 :1 mol%Ho/20 mol%Yb @ Y 2 O 3 :10 mol%Eu.
研究领域:
材料科学
·
光学
·
纳米技术
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Wei Liu,Shiqing Xu,Lei Lei
Lanthanide doped Sc 2 (MoO 4 ) 3 upconversion (UC) crystals showed distinct negative thermal quenching effect, which show promising applications in the temperature sensing field. However, it is still valuable to develop novel routes to enhance the room temperature UC intensity. Herein, the UC intensity of the Yb/Er (Ho) doped Sc 2 Mo 3 O 12 crystals were significantly enhanced by doping Ca 2+ ions. The incorporation of Ca 2+ ions can break the crystal symmetry around the activators and then promote the 4f-4f transitions followed by the enhanced UC. Especially, the UC intensity of the Sc 2 Mo 3 O 12 :20Yb/1Ho/20Ca was about 100 times than that of Sc 2 Mo 3 O 12 :20Yb/1Ho phosphors. Furthermore, the thermally couple levels based temperature sensing performance was improved after doping Ca 2+ ions. Our results may promote the exploration of novel scheelite structural compounds with superior UC properties.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiuhua Ji,Yanhao Song,Jiarun Wang,Yi Ding,Shiyin Ji,Tao Duan
Zirconolite and pyrochlore have been considered as the potential immobilization matrix materials of minor actinides due to their high solubility, radiation tolerance and chemical durability. In this work, a series of Ca 1-x Ho 2x Zr 1-x Ti 2 O 7 (0.1 ≤ x ≤ 1.0) ceramics were prepared by solid state synthesis and sintering at 1400 °C for 48 h twice. Powder X-ray Diffraction (XRD), Backscattered Scanning Electron Microscopy with Energy-Dispersive X-ray spectroscopy (BSEM-EDX), Transmission Electron Microscopy (TEM) were employed to investigate the phase evolution, solubility, and substitution mechanism of Ho. The results displayed that zirconolite-2M would be transformed to zirconolite-4M and then to pyrochlore with increasing Ho concentration. The initial phase transformation of zirconolite-2M to zirconolite-4M, subsequently zirconolite-4M to pyrochlore were observed in x = 0.2 and 0.4 samples, respectively. Zirconolite-4M could be synthesised at x = 0.38 sample with trace perovskite. Moreover, the semi-quantitively solubility limits of Ho in zirconolite-2M and zirconolite-4M were determined to be 27 and 41.5 at.%, respectively. Single-phase pyrochlore were fabricated after 70 at.%. In addition, the novel substitution mechanism was revealed by Rietveld refinement with Ho preferentially replacing the Ca of zirconolite-2M so that some replaced Ca occupied vacant Zr site. For pyrochlore, Ho, Ca and Zr occupied A site (16d) and Ti entered in B site (16c). The findings would provide more insights into zirconolite–pyrochlore ceramic system.
研究领域:
材料科学
·
核化学与放射化学
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DOI
高影响因子
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
·
2017
·Vol. 72
·期 9
·2562-2569
·
IF 5.071
Dai Chongshan,Tang Shusheng,Wang Yang,Velkov Tony,Xiao Xilong
BackgroundNephrotoxicity is the major adverse effect patients experience during colistin therapy. The development of effective nephroprotective agents that can be co-administered during polymyxin therapy remains a priority area in antimicrobial chemotherapy.ObjectivesTo investigate the nephroprotective effect of baicalein, a component of the root of Scutellaria baicalensis, against colistin-induced nephrotoxicity using a mouse model.MethodsC57BL/6 mice were randomly divided into the following groups: control, baicalein 100 mg/kg/day (administered orally), colistin (18 mg/kg/day administered intraperitoneally) and colistin (18 mg/kg/day) plus baicalein (25, 50 and 100 mg/kg/day). After 7 day treatments, histopathological damage, the markers of renal functions, oxidative stress and inflammation were examined. The expressions of Nrf2, HO-1 and NF-κB mRNAs were also further examined using quantitative RT–PCR examination.ResultsBaicalein co-administration markedly attenuated colistin-induced oxidative and nitrative stress, apoptosis, the infiltration of inflammatory cells, and caused decreases in IL-1β and TNF-α levels (all P < 0.05 or 0.01) in the kidney tissues. Baicalein co-administration up-regulated expression of Nrf2 and HO-1 mRNAs and down-regulated the expression of NF-κB mRNA, compared with those in the colistin alone group.ConclusionsTo the best of our knowledge, this is the first study demonstrating the protective effect of baicalein on colistin-induced nephrotoxicity and apoptosis by activating the antioxidant defence mechanism in kidneys and down-regulating the inflammatory response. Our study highlights that oral baicalein could potentially ameliorate nephrotoxicity in patients undergoing polymyxin therapy.
研究领域:
药理学
·
肾病学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）