CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuheng Zhang,Junqi Chen,Jinwu Chen,Yang Zhou,Xiaoyu Wu,Ying Tang,Liang Fang,Huaicheng Xiang
Gd 1- x Ca x V 1- x Mo x O 4 (0 ≤ x ≤ 1) solid-solution/composite ceramics with low permittivity were synthesized via the solid-state reaction method, and their crystal structures, phase compositions, and microwave dielectric properties were investigated. As the substitution of Ca 2+ and Mo 6+ increased, phase evolutions were observed: tetragonal zircon ( I 4 1 / amd ) for x < 0.2, a mixture of tetragonal zircon and scheelite (0.2 ≤ x ≤ 0.8), and tetragonal scheelite ( I 4 1 / a ) for x > 0.8. GdVO 4 , a tetragonal zircon, exhibited a low ε r (11.48) and a near-zero τ f (−13.2 ppm/°C), yet its Q × f value is suboptimal (9400 GHz). This limitation stems from its low structural stability, attributed to the prevalent edge-sharing polyhedra and high magnetic susceptibility of Gd. With the increased substitution of Ca 2+ and Mo 6+ , the Q × f value of Gd 1- x Ca x V 1- x Mo x O 4 ceramics rose to 79,300 GHz ( x = 1), while the τ f value concurrently dropped to −61.7 ppm/°C. The inherent factors affecting the microwave dielectric properties were determined by Raman scattering and infrared reflection (IR) spectra, dielectric temperature spectrum, magnetic susceptibility, and thermal expansion analysis.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruonan Wang,Ruitong Song,Chenning Wang,Tian Luo,Junshan Hu,Hao Fu
Although upconversion luminescence (UCL) materials have attracted considerable attention in biomedical, lighting, anti-counterfeiting, and solar cells due to their excellent fluorescence properties, reports of the dibarium gadolinium aluminum oxide (Ba 2 GdAlO 5 ) are scarce. Herein, we synthesized the single-phase Ba 2 GdAlO 5 material with non-stoichiometric Ba 2 Gd 1.06 Al 0.94 O 5 (denoted as BGAO, hereafter). The X-ray Rietveld refinement reveals that the substitution of Gd for Al accounts for the non-stoichiometry. Notably, the UCL properties of BGAO are realized by doping with Yb 3+ and Er 3+ ion pair, and it can be further enhanced significantly by co-doping with appropriate Zn 2+ ions. The SEM images show that the particle size increases as the concentration of Zn 2+ ions increases. The X-ray Rietveld refinement results of the Zn-doped BGAO: 0.1 Yb 3+ , 0.03Er 3+ phosphor indicate the substitution of Zn 2+ for Ba 2+ and Al 3+ ions simultaneously. Grain growth and lattice distortion account for the improvement of UCL properties after Zn 2+ ions doping. In addition, the temperature sensing performance of the Zn 2+ -doped sample has been researched based on the fluorescence intensity ratio (FIR) technique, and the maximum absolute and relative sensitivities ( S A-max and S R-max ) are obtained to be 4.8 × 10 −3 K −1 at 498 K and 1.1% K −1 at 298 K, respectively. This work provides a candidate with high UCL intensity for potential applications in optical temperature sensors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·
IF 4
Bowen Wang,Changshuai Gong,Xuyan Xue,Meiting Li,Qi Zhu,Xuejiao Wang,Ji-Guang Li
A series of CaGdAlO4-type layered perovskite phosphors showing deep red luminescence (λem = 711 nm, λex = 338 nm) were synthesized via a solid-state reaction. A comprehensive analysis performed via photoluminescence, X-ray photoelectron spectroscopy, thermoluminescence, and fluorescence decay revealed that the deep red luminescence is related to oxygen defects and particularly oxygen interstitials. The defect-related luminescence was effectively regulated through partial substitution of multi-cationic sites (the Ca2+ site with Mg2+, Sr2+, and Ba2+; the Gd3+ site with La3+, Y3+, and Lu3+) and full substitution of Gd3+ with Y3+. Remarkably, a 383.3% stronger luminescence was obtained through partial substitution with Lu3+, and the quantum yield of luminescence reached 28.74%, which is higher than those values of most previously reported self-luminescent systems. A pc-LED device was fabricated using this phosphor, and the device was shown to have potential application in indoor plant cultivation.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·1327-1334
·
IF 5.6
Yuping Hou,Yusong Du,Xiaofei Wu,Guihua Li,Lin Li,Huan Li,Shuai Cheng,Jingtai Zhao
Highly efficient mechanoluminescent material Gd 3 GaO 6 : Eu 3+ was synthesized by high-temperature solid-phase method. The phosphor can effectively excited by ultraviolet light near 261 nm, along with strong red emission from the phosphor at 612 nm due to the main radiation transition of 5 D 0 - 7 F 2 of Eu 3+ . The results of photoluminescence and mechanoluminescence indicated that the luminescence intensity reaches a maximum when the concentration of Eu 3+ is 0.1. The thermoluminescence spectroscopy results indicated that the mechanoluminescence manifestation of the phosphor was caused by the release of carriers from the trap under mechanical stimulation, thereby revealing the mechanism of mechanoluminescence of Gd 3 GaO 6 : Eu 3+ . The possible applications of wearable devices based on fluorophores in the bending-induced mode are also proposed, showing a wider development prospect for the application of phosphors to wearable devices.
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产品关联
DOI
高影响因子
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
·
2024
·
IF 2.3
Tingting Hu,Chuanling Wan,Youyang Zhan,Xiaojing Li,Yan Zheng
A biocompatible macromolecule-conjugated gadolinium chelate complex (PAV 2 -EDA-DOTA-Gd) as a new liver-specific contrast agent for magnetic resonance imaging (MRI) was synthesized and evaluated. An aspartic acid–valine copolymer was used as a carrier and ethylenediamine as a chemical linker, and the aspartic acid–valine copolymer was covalently linked to the small molecule MRI contrast agent Gd-DOTA (Dotarem) to synthesize a large molecule contrast agent. In vitro MR relaxation showed that the T 1 -relaxivity of PAV 2 -EDA-DOTA-Gd (13.7 mmol −1 L s −1 ) was much higher than that of the small-molecule Gd-DOTA (4.9 mmol −1 L s −1 ). In vivo imaging of rats showed that the enhancement effect of PAV 2 -EDA-DOTA-Gd (55.37 ± 2.80%) on liver imaging was 2.6 times that of Gd-DOTA (21.12 ± 3.86%), and it produced a longer imaging window time (40–70 min for PAV 2 -EDA-DOTA-Gd and 10–30 min for Gd-DOTA). Preliminary safety experiments, such as cell experiments and tissue sectioning, showed that PAV 2 -EDA-DOTA-Gd had low toxicity and satisfactory biocompatibility. The results of this study indicated that PAV 2 -EDA-DOTA-Gd had high potential as a liver-specific MRI contrast agent.
研究领域:
医学影像学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Mi Zhou,Feng Ling,Jie Li
We now report a star-shaped supramolecular copolymer for diagnosis and treatment by chelated with Gd 3+ ion as magnetic resonance imaging (MRI) contrast agent and drug-carried for controlling release agent. The copolymer is prepared by the host-guest inclusion complexation between the host polymer polycaprolactone-β-cyclodextrin (4sPCL-CD) and the guest polymer adamantylamine-poly-L-lactic-block-poly(N-isopropylacrylamide-co-2-hydroxyethylmethacrylate-diethylenetriamine penta acetic acid) (AD-PLLA- b -P(NIPAM- co -HEMA-DTPA)) and can self-assemble into spherical micelles in aqueous solution. By adding 2-adamantylamine hydrochloride (AD-NH 2 ), the supramolecular copolymer can be disassembled to the host and guest polymers and its molecular weight will be decreased. When the polymeric micelles are chelated with Gd 3+ ion, they exhibit T 1 relaxivity as a kind of contrast agent for MRI. This contrast agent can maintain a large molecular size to stay in vivo and also can reduce its molecular size quickly and metabolize rapidly from the body by disassembled. Also, as the copolymer carries drugs, it displays burst release and thermal-response release behaviors, due to its dis-assembly and thermal-response PNIPAM chain respectively. Thus, the supramolecular copolymer from the host-guest inclusion complexation is expected to realize diagnosis and treatment feature for clinic.
研究领域:
材料科学
·
医学影像
·
药物递送
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chenchen Liu,Xiaoming Liu,Zhihao Wei,Zong Chang,Yaowei Bai,Pei Zeng,Qi Cao,Changjun Tie,Ziqiao Lei,Peng Sun,Huageng Liang,Qinchao Sun,Xiaoping Zhang
Magnetic resonance angiography (MRA) contrast agents are extensively utilized in clinical practice due to their capability of improving the image resolution and sensitivity. However, the clinically approved MRA contrast agents have the disadvantages of a limited acquisition time window and high dose administration for effective imaging. Herein, albumin-coated gadolinium-based nanoparticles (BSA-Gd) were meticulously developed for in vivo ultrahigh-resolution MRA. Compared to Gd-DTPA, BSA-Gd exhibits a significantly higher longitudinal relaxivity (r1 = 76.7 mM–1 s–1), nearly 16-fold greater than that of Gd-DTPA, and an extended blood circulation time (t1/2 = 40 min), enabling a dramatically enhanced high-resolution imaging of microvessels (sub-200 μm) and low dose imaging (about 1/16 that of Gd-DTPA). Furthermore, the clinically significant fine vessels were successfully mapped in large mammals, including a circle of Willis, kidney and liver vascular branches, tumor vessels, and differentiated arteries from veins using dynamic contrast-enhanced MRA BSA-Gd, and have superior imaging capability and biocompatibility, and their clinical applications hold substantial promise.
研究领域:
医学影像学
·
纳米医学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2014
·Vol. 7
·期 11
·1581-1591
·
IF 6.963
Guo Weisheng,Yang Weitao,Wang Yu,Sun Xiaolian,Liu Zhongyun,Zhang Bingbo,Chang Jin,Chen Xiaoyuan
Inorganic nanoparticles have been introduced into biological systems as useful probes for in vitro diagnosis and in vivo imaging, due to their relatively small size and exceptional physical and chemical properties. A new kind of colortunable Gd-Zn-Cu-In-S/ZnS (GZCIS/ZnS) quantum dots (QDs) with stable crystal structure has been successfully synthesized and utilized for magnetic resonance (MR) and fluorescence dual modality imaging. This strategy allows successful fabrication of GZCIS/ZnS QDs by incorporating Gd into ZCIS/ZnS QDs to achieve great MR enhancement without compromising the fluorescence properties of the initial ZCIS/ZnS QDs. The as-prepared GZCIS/ZnS QDs show high T
1 MR contrast as well as “color-tunable” photoluminescence (PL) in the range of 550–725 nm by adjusting the Zn/Cu feeding ratio with high PL quantum yield (QY). The GZCIS/ZnS QDs were transferred into water via a bovine serum albumin (BSA) coating strategy. The resulting Cd-free GZCIS/ZnS QDs reveal negligible cytotoxicity on both HeLa and A549 cells. Both fluorescence and MR imaging studies were successfully performed in vitro and in vivo . The results demonstrated that GZCIS/ZnS QDs could be a dual-modal contrast agent to simultaneously produce strong MR contrast enhancement as well as fluorescence emission for in vivo imaging.
研究领域:
生物医学工程
·
纳米医学
·
影像学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Guilong Zhang,Junlan Gao,Junchao Qian,Lele Zhang,Kang Zheng,Kai Zhong,Dongqing Cai,Xin Zhang,Zhengyan Wu
A pH-responsive nanoplatform, hydroxylated mesoporous nanosilica (HMNS) coated by polyethylenimine (PEI) coupled with gadolinium and folic acid (FA) (Gd-FA-Si), was designed to deliver anticancer drug targeting and to promote contrast effect for tumor cells using magnetic resonance (MR) spectrometer. Doxorubicin (DOX) was chosen as the anticancer drug and loaded into nanopores of HMNS, then its release in simulated body fluid could be controlled through adjusting the pH. This nanoplatform could significantly enhance the MR contrast effect, and the highest theoretical relaxivity per nanoplatform could even be approximately 1.28 × 106 mm–1s–1 because of the high Gd payload (2.61 × 105 per nanoplatform). The entire system possessed a high targeting performance to Hela and MDA-MB-231 cells because the FA located in the system could specifically bind to the folate–receptor sites on the surface of cell. Compared with free DOX, the nanoplatform presented a higher cell inhibition effect on the basis of cell assay. Therefore, this nanoplatform could be potentially applied as a tumor-targeted T1 MR contrast agent and pH-sensitive drug carrier system.
研究领域:
生物医学工程
·
材料科学
·
肿瘤学
·
影像医学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 2
·196-202
·
IF 0.957
Xie Dayan,Zhang Kuibao,Li Weiwei,Luo Baozhu,Guo Haiyan
We reported a rapid synthesis of Sm 3+ /Zr 4+ co-doped Gd 2 Ti 2 O 7 pyrochlore simulated nuclear wastes solidification by self-propagation plus quick pressing technique. With increment excess contents of Sm 2 O 3 and ZrO 2 from 0 to 10wt%, the phase composition of the products is a mixed phase of pyrochlore structure and defective fluorite structure by X-ray diffraction (XRD) analysis and Raman spectrum. In addition, the SEM results demonstrate the fracture surface and microstructure of Gd 2 Ti 2 O 7 -based pyrochlore. The densified pyrochlore waste form exhibits high bulk density of 5.56 g·cm −3 and vickers hardness of 11.20±0.2 GPa. The leaching tests show that the elemental leaching rates of Gd, Sm, and Cu after 42 days are 1.92×10 −4 , 1.51×10 −4 , and 3.90×10 −3 g·m −2 ·d −1 , respectively.
研究领域:
材料科学
·
核化学与放射化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Chuancheng Zhang,Shoujun Ding,Wenzhi Su,Miaomiao Wang,Haitang Hu,Yong Zou,Wenpeng Liu,Qingli Zhang
Inhomogeneous broadening in disordered crystals has been widely recognized as a successful approach to enhance the spectral bandwidth of rare earth ions in optical spectra, and the Yb3+-doped mixed laser crystals are known as ultrafast pulse materials and have emerged as a hotspot recently. In this study, mixed sodium gadolinium/lanthanum double molybdate disordered laser crystals NaGd(1–x)La(x)(MoO4)2 with x = 0.3, 0.5, and 0.9 were grown by the Czochralski (Cz) method. The structure of as-grown crystals was investigated by XRD, SEM, FT-IR, and Raman experiments. The spectroscopic properties, including absorption, emission, and fluorescence decay characteristics, were investigated thoroughly. The NaGd0.5La0.5(MoO4)2 (NGLM) composite crystal exhibited an exceptionally broad absorption which reaches 70 nm (fwhm) at 980 nm, exceeding those of NaGd(MoO4)2 (NGM) and NaLa(MoO4)2 (NLM). Additionally, the electronic structures (band structure and density of states) of NGM, NGLM, and NLM were determined from the first-principles method combined with the PBE function. The calculations of defect formation energies under O-poor and O-rich conditions demonstrate that the +2 defects are easily generated in the undoped NGM crystal prepared under reducing atmospheres, and the calculation of absorption properties reveals that the black color of NGM without annealing is mainly attributed to intraband transitions between defect induction states and VBM or CBM. Moreover, the lifetimes of excited energy level 2F5/2 of Yb3+ were examined under different experimental environments to obtain the intrinsic radiative lifetime, and the emission cross section was calculated as 2.25 × 10–20 cm2 at 1016 nm. The features of the Yb3+:NaGd(1–x)La(x)(MoO4)2 crystal indicate the potential applications for ultrafast and broad tunable laser through slight regulation of the composite engineering strategy.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Kaipeng Tian,Jiawei Mu,Zijie Li,Yibo Yang,Kuibao Zhang,Kailei Lu,Jianqi Qi,Tiecheng Lu
Advanced nuclear plants demand shielding windows for in situ monitoring and robust shielding against gamma (γ) and neutron (n) radiation. However, existing windows lack simultaneous γ/n attenuation and sufficient fracture toughness, hindering practical deployment. To address this, a novel Gd 3 TaO 7 transparent ceramics (GTO-TCs) for an efficient n and γ dual-shielding window is proposed and demonstrated. The developed GTO ceramic window exhibits high optical transmittance (78% at 2000 nm) and excellent mechanical properties (Hv and K IC are 9.61 GPa and 2.60 MPa·m 1/2 , respectively). Significantly, the GTO ceramic presents a γ-ray linear absorption coefficient of 0.34 for over 90% γ attenuation from 60 Co at 5.8 cm thickness, coupled with Monte Carlo verified full thermal n attenuation (<0.4 eV) at merely 2 mm. The developed GTO window possesses excellent n and γ dual-shielding properties, robust fracture toughness, and has promising prospects for service in extreme nuclear environments.
研究领域:
材料科学
·
核工程
·
无机非金属材料
·
辐射防护
·
先进陶瓷
✓ 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）