JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·809-818
·
IF 3.094
Zhigang Sun,Ziyun Chen,Mengyao Wang,Bin Lu
We first report the novel Ce 3+ -activated and Lu 3+ -stabilized gadolinium aluminate garnet (GAG) transparent ceramics derived from their precipitation precursors via a facile co-precipitation strategy using ammonium hydrogen carbonate (AHC) as the precipitant. The resulting precursors in liquid phase were substantially homogeneous solid solutions and could directly convert into sinterable garnet powders via pyrolysis. Substituting 35 at.% of Lu 3+ for Gd 3+ was effective to stabilize the cubic GAG garnet structure and transparent (Gd,Lu) 3 Al 5 O 12 :Ce ceramics were successfully fabricated by vacuum sintering at 1715°C. The ceramic transparency was improved by optimizing the particle processing conditions and the best sample had an in-line transmittance of ~70% at 580 nm (Ce 3+ emission center) and over 80% in partial infrared region with a fine average grain size of ~4.5 μm. Transparent (Gd,Lu) 3 Al 5 O 12 :Ce ceramics have a short critical wavelength (<200 nm) and a maximal infrared cut-off at ~6.6 μm. Both the (Gd,Lu) 3 Al 5 O 12 :Ce phosphor powder and the transparent ceramic exhibited characteristic yellow emission of Ce 3+ with strong broad emission bands from 490 to 750 nm upon UV excitation into two groups of broad bands around 340 and 470 nm. The photoluminescence and photoluminescence excitation intensities as well as the quantum yield were greatly enhanced via high-temperature densification. Both the phosphor powder and ceramic bulk had short effective fluorescence lifetimes.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2022
·
IF 11.467
Jiayao Chen,Jiani Liu,Duo Xu,Junfeng Liu,Xiaojun Chen,Shuai Yang,Pan Yin,Zebo Jiang,Chaoming Mei,Xiaoting Zhang,Lizhu Wang,Ke Zhang,Bin Zhou,Hong Shan,Dan Li,Pengfei Pang
Transcatheter arterial chemoembolization (TACE), the mainstream treatment for hepatocellular carcinoma (HCC), is a method of blocking tumor blood vessels with a mixture of lipiodol and chemotherapeutics. And the contrast-enhanced computed tomography (CT) is the commonly used way for follow-up of HCC after TACE. However, it is noteworthy that when lipiodol deposition plays an embolic effect, it also produces high-density artifacts in CT images. These artifacts usually conceal the enhancement effect of iodine contrast agents. As a result, the residual region is difficult to be visualized. To overcome this obstacle, we developed one kind of Lu 3+ /Gd 3+ doped fluoride nanoprobe modified with Dp-PEG2000 to realize CT/MRI dual-modality imaging of HCC. Compared with lipiodol or ioversol , the obtained PEGylated product LG-PEG demonstrated a greater density value in high keV CT images. In vitro experiments showed the lipiodol artifacts can be removed in virtual non-contrast (VNC) imaging, but the density of ioversol was also removed at the same time. However, the LG-PEG synthesized in this work can still maintain a high density in VNC imaging, which indicates that LG-PEG can exploit its advantages to the full in VNC imaging. Furthermore, LG-PEG successfully exerted tumor enhancement effects in the in vivo VNC images of HCC with lipiodol deposition. In addition, LG-PEG exhibited a strong T 2 enhancement effect with low biological toxicity and less side-effect on the main organ and blood. Thus, the LG-PEG reported in this research can serve as an effective and safe VNC contrast agent for HCC imaging after TACE.
研究领域:
医学成像
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纳米技术
·
肿瘤学
·
放射学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Li Chen,Hailian Li,Ji Chen,Deqian Li,Tianchi Liu
Incomplete stripping and high acidity consumption were the major drawbacks for the separation of heavy rare earth elements (HREEs) by the popular extractant 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507). This article studied di-(2-ethylhexyl) phosphinic acid (P227) from thermodynamics and kinetics theoretical researches to cascade extraction simulations for the separation of HREEs. P227 was capable of complete stripping for HREEs with low acidity, and had high organic REE loading with clear and fast phase separation. Constant interfacial area cell with laminar flow was implemented to reveal the different kinetics mechanisms for the extraction and stripping of Lu 3+ . The multi-stages of cascade extraction simulation designed for the separation between Er 3+ /Tm 3+ could be of great significance for practical application. Corresponding products with high purity at both exits obtained successfully via the simulation. All these will provide the promising industrial applications of P227 with more fundamental data and guidance.
研究领域:
化学工程
·
稀有金属提取
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 17
·3574
·
IF 3.7
Yuetong Zhen,Hui Lin,Yang Tang,Junwei Zhang,Yuchong Ding,Qiang Wang,Dawei Zhang,Jianren Xu
Ce3+-activated Gd3(Al,Ga)5O12:Ce scintillation ceramics have been widely studied due to their excellent scintillation properties. However, the relatively long radiative lifetime and slow decay components limit their applications in X-ray imaging. To address these issues, Lu3+ions were introduced to partially substitute Gd3+ions, thereby weakening the role of self-trapped states in the excitation process of Ce3+and reducing the negative effects caused by shallow electron traps. As a result, the scintillation decay time was, overall, shortened, and an average decay time of 63 ns was obtained when x = 0.997. Meanwhile, the afterglow behavior induced by shallow electron traps was significantly suppressed (for the sample with x = 0.5, the afterglow intensity was measured to be approximately 0.48% of the initial intensity at 100 ms after the X-ray excitation was turned off). Meanwhile, an X-ray imaging spatial resolution comparable to that of commercial CsI:Tl (10 lp mm−1) was achieved for the (Gd,Lu)3Ga2Al3O12:Ce3+scintillation ceramics.
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DOI
PubMed
高影响因子
Metals
·
2023
·Vol. 13
·期 12
·1972
·
IF 2.9
Huiyu Qian,Zhigang Sun,Tuanjie Liang,Mengyao Wang,Bin Lu,Hongbing Chen,Linwen Jiang
Transparent ceramics (Gd0.975−xLuxDy0.025)3Al5O12(x = 0.2, 0.5, 0.975) are fabricated by vacuum sintering with the transmittance of ~60% at 583 nm. The doping of Lu3+was beneficial to stabilize the garnet phase, and the best doping concentration was 20 at.%. All three (Gd, Lu)3Al5O12:Dy ceramics display typical Dy3+emission, originating from4F9/2→6HJ(J = 15/2, 13/2, 11/2) transition. Temperature-dependent luminescence spectra from 303.15 K to 603.15 K prove that the (Gd, Lu)3Al5O12:Dy ceramics had good thermal stability and could be an ideal yellow-emitting candidate in light-emitting diodes. The luminous efficiency of the encapsulated white LED lamp was found to be ~87.9 lm/W when the injection current was 600 mA. The transparent (Gd, Lu)3Al5O12:Dy ceramics show great application potential in various optical systems especially in the fields of luminescence and display.Keywords:transparent ceramics;luminescence;white LED;luminous efficiency
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 28
·13402-13409
·
IF 7.233
Sihan Ma,Jiaxin Zhang,Shibo Xia,Wenyan Yin,Yanxia Qin,Runhong Lei,Jianglong Kong,Linqiang Mei,Juan Li,Gengmei Xin,Gongping Li
Designing nanosized multi-modality contrast agents for high-resolution imaging is challenging since most agents are only useful for single-mode imaging. In this work, we successfully synthesized biocompatible polyethylene glycol (PEG-) and L-glutamine (GLN-) modified Ba4Yb3F17:Lu3+,Gd3+ nanoparticles (LNPs@PEG@GLN) that can be employed as a multi-modality contrast agent. Fluorescence dye-modified LNPs@PEG@GLN nanoparticles can be used for computed tomography (CT), magnetic resonance imaging (MRI), and fluorescence imaging (FI). They display high X-ray absorption, outstanding T2-weighted imaging capability, and good fluorescence uptake. Furthermore, LNPs@PEG@GLN enhances contrast efficiencies for different imaging modalities in vivo. Interestingly, LNPs@PEG@GLN is a promising agent for CT angiography. These nanoparticles could be a promising contrast agent for multi-modality imaging and diagnosing vascular diseases.
研究领域:
医学影像学
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纳米医学
·
分子影像学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Xinwen Liu,Zhiwei Zhou,Bingchu Mei,Zaichun Sun,Guolong Tan
The asymmetric hexagonal Sr 5 (PO 4 ) 3 F (S-FAP) crystal material is considered to be the most suitable solid state laser gain medium for small laser diode pumping in the future due to its large absorption, emission interface, and long fluorescence lifetime. However, the mediocre optical transmittance of S-FAP transparent ceramics and the degradation of luminescence properties due to the doping of Yb activated ions seriously hinder its application prospects. In view of this, a series of 0.02Yb, xLu: S-FAP (x = 0–0.02) transparent ceramics with excellent optical properties were synthesized by hot pressing sintering. The powder SEM results show that Lu doping has no obvious effect on the morphology, grain size, and dispersion of powder . The linear transmissivity curves show that the ultraviolet (200 nm) and visible (500 nm) transmissivity increase by 54 % and 17 %, respectively, with Lu doping compared with the undoped ceramic samples. The surface SEM of ceramics revealed that Lu 3+ promoted the increase of ceramic grain size significantly. The emission spectrum and fluorescence decay curves at room temperature also show that the emission intensity and fluorescence lifetime of ceramic samples increase significantly with Lu co-doping.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2020
·Vol. 49
·期 2
·166-178
·
IF 1.273
Zhu Liqing,Liu Bijun,Yang Xia,Zhuo Liangang,Mu Wanjun,Chen Yue,Yang Yuchuan,Wei Hongyuan,Li Xingliang
Thermodynamic equilibria of complexes of 1,3-diamino-2-hydroxypropane- N , N , N ', N '-tetraacetic acid (DHPTA) with heavy lanthanides (Tb 3+ , Ho 3+ and Lu 3+ ) in aqueous solution have been investigated with potentiometry, spectrophotometry, luminescence spectroscopy and nuclear magnetic resonance spectroscopy (NMR). The results identified three 1:1 Ln/DHPTA (Ln: Tb 3+ , Ho 3+ and Lu 3+ ) complexes with different degrees of deprotonation, LnL − , Ln(H −1 L) 2− , and Ln(OH)(H −1 L) 3− , where H −1 represents the deprotonation of the hydroxyl group between two methyliminodiacetate groups in the DHPTA structure. The alkoxide form of the DHPTA hydroxyl group directly binds to the lanthanide atom, forming highly strong chelation. The complex of Ln(H −1 L) 2− could be present as a dimeric or polymeric complex in solution.
研究领域:
配位化学
·
无机化学
·
物理化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Dandan Ju,Feng Song,Jun Zhang,Chengguo Ming,Feifei Song,Adnan Khan,Aihua Zhou,Xueqin Wang,Lisa Liu
Dynamic tuning upconversion color is the most convenient approach through modulation of pump power density and NIR wavelength for anti-counterfeiting. However, most of bulk upconversion systems suffer from the insensitive response to excitation power and NIR wavelength (980 nm and 1550 nm). Herein, we demonstrate that the excitation power density sensitivity and NIR wavelength sensitivity of bulk microcrystals could be improved via co-doping Li + /Lu 3+ ions. More interestingly, co-doping ions with different valences affect the emission color tendency at 1550 nm excitation, which is contrary to previous reports. The emission color of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals transform from yellow to bright green color through adjusting pump power density and pump wavelength (980 nm and 1550 nm). Moreover, the mechanism of the results has been systematically discussed. The tunable emission colors of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals can be easily distinguished with naked eyes and difficultly counterfeited. Therefore, the upconversion materials have a promising application in transparent anti-fake printing.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）