POLYHEDRON
·
2014
·
IF 2.047
Tianzhi Yu,Ruizhi Liang,Yuling Zhao,Yalu Song,Bin Gao,Minghao Li,Luofu Min,Hui Zhang,Duowang Fan
Lanthanide complexes of the form Ln(DBM) 3 (Cz-PBM) (where Ln = Gd(III), Tb(III) and Eu(III); DBM = dibenzoylmethane and Cz-PBM = (4-(9 H -carbazol-9-yl)phenyl)methyl-2-(2′-pyridyl)benzimidazole) have been successfully synthesized and characterized. The crystal structures of the Gd(III) and Tb(III) complexes were determined by single-crystal X-ray analysis. The results reveal that in the complexes the central metal ions assume a square antiprismatic geometry and are octa-coordinated by six oxygen atoms from DBM ligands and two nitrogen atoms from the Cz-PBM ligand. Under excitation with ultraviolet light, the Eu(III) complex exhibited a strong red emission, but the Tb(III) complex did not show the characteristic emissions of the Tb 3+ ion. The results show that the ligands favor energy transfers to the emitting energy level of Eu 3+ .
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 2
·1-10
·
IF 2.278
Du Weimin,Zhang Youjuan,Wang Yanbin,Liu Junning,Lu Haiyang,Hou Suhan,Zhang Xiaohua
Abstract Zirconia modified by gadolinium (Gd/ZrO 2 ) nanocomposite has been successfully prepared by NaCl-assisted method. The effects of gadolinium introduction on phase, composition, optical properties, and photocatalytic activities were investigated in detail. Results reveal that the introduction of gadolinium could enlarge the lattice space, create structural defects, and restrict the product growth. At the same time, the generated structural defects further influence the optical properties of Gd/ZrO 2 nanocomposite with single phase. Photocatalytic experiments indicate that Gd 0.2 Zr 0.8 O 2− δ
nanocrystals have better visible-light-responsive photocatalytic activities which results from the special structural defect, smaller size (30–55 nm), and larger specific surface area (~50.60 m 2 /g). Hence, Gd 0.2 Zr 0.8 O 2− δ
nanocrystals are promising visible-light-responsive photocatalysts with potential prospects in wastewater treatment and environmental protection. Also, the present NaCl-assisted method might be generalized to synthesize other nanocomposite with more complicated structures. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yibo Wang,Shuai Hou,Rongpeng Ma,Jiadong Jiang,Zhaoping Shi,Changpeng Liu,Junjie Ge,Wei Xing
Simultaneously improving the activity and long-term stability of the oxygen evolution electrocatalysts in acidic media is an ever ongoing process for the water electrolysis technique. Here, we report a novel Gd-doped porous IrO2 (Gd-pIrO2) catalyst with a high specific surface at 293 m2 g–1 and enhanced catalytic activity toward oxygen evolution reaction (OER), where the overpotential required to reach 10 mA cm–2 is only 287 mV. We found that Gd3+ doping induces the formation of abundant oxygen vacancies and an increase in Ir4+/Ir3+ ratio, due to the charge compensating mechanism in defect chemistry. Combining experimental techniques and density functional theory calculations, we revealed that Gd doping at an appropriate content leads to an overall enhancement in OER performance, where oxygen vacancies facilitate the adsorption of water molecules and the high ratio of Ir4+/Ir3+ facilitates the H dissociation. The novel strategy proposed in this study provides an efficient way for designing high-performance electrocatalysts for water electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1233-1240
·
IF 3.3
Li Ding,Xin Kong,Yan Gong,Shanxin Yang,Yongde Yan,Yuan Deng,Yun Xue,Kai Zhu,Fuqiu Ma,Wei Liu
Bismuth (Bi) is a potential cathode material to drive the development of Gd extraction by molten salt electrolysis. However, study on the electrolytic reduction of Gd by Bi electrode in melts has not receive sufficient attention and understanding. Therefore, in this work, the electrochemical reactions, kinetic processes and thermodynamic properties in the electrolytic extraction of Gd were investigated by various electrochemical methods. The electrochemical results showed that only two Gd–Bi alloys were formed in the electrode reaction. Moreover, the exchange current density and activity coefficient during electrolysis were determined by galvanostatic pulse (GP) and Coulomb titration, respectively. The temperature dependence of both exchange current density and activity coefficient was further revealed. Finally, Gd was successfully extracted in the form of alloys through potentiostatic electrolysis.
研究领域:
冶金学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 24
·7965
·
IF 4.6
Tongtong Xu,Xudong Zheng,Ang Li,Biao Ji
In this paper, an ammonia–urea system was developed to induce the shedding of carboxymethylcellulose carbon aerogels to form defects, and the specific surface area of the aerogels was significantly increased after carbonization, and the three-dimensional disordered pore structure of cellulose was preserved. The material showed the selective adsorption of gadolinium ions using the carboxylate active sites provided by carboxymethylation and the microporous or mesoporous structures formed after carbon burning. The successful synthesis of the material was demonstrated by relevant characterization, and the results of static adsorption experiments showed that the material was more consistent with the quasi second-order kinetic model at pH = 5.0. The maximum adsorption capacity was 99.65 mg g−1. The material showed a high adsorption capacity for gadolinium ions in the presence of competing ions and maintained 84.07% of the adsorption performance after five adsorption cycles. The simple use of urea ensured that the cellulose maintained its pore structure, and the specific surface area was greatly increased after carbonization, which provided a feasible direction for the industrial adsorption and recycling of rare-earth elements for reuse.Keywords:carbon aerogel;rare-earth elements;adsorption;recovery;gadolinium
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5645-5652
·
IF 7.779
Yuan Lin,Chun-Li Hu,Zhi Fang,Jin Chen,Wei-Jie Xie,Yan Chen,Jian-Pu Wang,Jiang-Gao Mao
Three new potassium rare earth carbonates, namely KRE(CO3)2 (RE = Eu, Gd, Tb), were synthesized successfully. Their structures feature a novel [RE(CO3)2]− 3D framework with 1D channels along the c axis filled with K+ cations. Among them, KEu(CO3)2 and KTb(CO3)2 emit strong red and green photoluminescence, respectively. The birefringence values of KRE(CO3)2 were measured as 0.149, 0.162 and 0.215 at 546 nm, respectively. Remarkably, KTb(CO3)2 has the largest experimental birefringence among carbonates reported.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 82
·78396-78402
·
IF 3.289
Kai Zhang,Jing-Shan Hou,Bo-Mei Liu,Yang Zhou,Zi-Jun Yong,Li-Na Li,Hong-Tao Sun,Yong-Zheng Fang
In this work, we demonstrated that bismuth-doped oxygen-deficient gadolinium oxides, produced through a low-temperature topochemical reduction strategy using CaH2 as a solid-state reducing agent, show superbroad near-infrared photoluminescence covering the second biological window. Structural analyses confirm that the topochemical reduction treatment of bismuth-doped gadolinium oxides creates oxygen vacancies in the gadolinium oxide matrix, which changes the coordination of Bi and makes it situate in a defective environment. Given the tantalizing superbroad near-infrared emission from the reduced phases, it is anticipated that this novel system may find applications for in vitro/in vivo near-infrared fluorescence imaging in the second biological window.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 1
·92-101
·
IF 4.872
Yi Pan,Jun Yang,Yaning Fang,Junhui Zheng,Rong Song,Changqing Yi
In this study, an efficient and mild approach is reported for the facile synthesis of a carbon quantum dot (CQD)-based dual-modal fluorescence (FL)/magnetic resonance (MR) imaging probe by doping Gd(III) into CQDs through a one-pot pyrolysis process at low temperature. The as-prepared Gd-encapsulated CQDs (GCDs), which have an average diameter of ∼15 nm, are highly water-soluble. The GCDs are observed to have a high MR response with a longitudinal relaxation of 57.42 mM−1 s−1 and a strong fluorescence brightness with an absolute quantum yield of 40% while containing only 1.0% (w/w) of Gd3+ content. Stemming from the minimum Gd-doping and the inert carbon coating, GCDs exhibit excellent biocompatibility and blood compatibility. Dual-modality bioimaging applications of GCDs are successfully demonstrated by the use of HeLa cells and mice as models, revealing their great potential in fundamental biomedical research studies and even clinical fields such as fluorescence-guided surgery and dual-modal FL/MR imaging of blood vessels.
研究领域:
生物医学工程
·
材料科学
·
医学影像学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2014
·Vol. 139
·期 18
·4613-4619
·
IF 3.906
Dan Zhang,Ai Gao,Yang Xu,Xue-Bo Yin,Xi-Wen He,Yu-Kui Zhang
Mesoporous silica nanoparticles (MSNs) were co-doped with Gd3+ and Al3+ and then loaded with Ru(bpy)32+ by ion-exchange to prepare Ru/Gd–Al@MSNs. The as-prepared Ru/Gd–Al@MSNs were applied as contrast agents for in vivo fluorescence and magnetic resonance (MR) dual-modality imaging with a mouse as a model. The effects of Al3+ and MSNs on longitudinal relaxivity (r1) and fluorescence were investigated using a series of Gd-containing silica nanoparticles, including Gd@MSNs, Gd–Al@MSNs, and Ru/Gd–Al@nonporous silica nanoparticles. Co-doping with Al3+ improved the loading of Gd3+; the mesoporous structure improved the water exchange rate. The improvement enhanced the MR imaging efficiency of the Ru/Gd–Al@MSN probe. A higher relaxivity (19.2 mM−1 s−1) was observed compared to that from a commercial contrast agent, Gd-diethylene triamine pentaacetic acid (Gd-DTPA). Importantly, the mesoporous structure provided a large specific surface area for the loading of Ru(bpy)32+ by a simple ion-exchange procedure. Intense red fluorescence was observed from Ru/Gd–Al@MSN probes. The versatility of Ru/Gd–Al@MSNs for dual-modality imaging was demonstrated using in vivo fluorescence imaging and T1-weighted MR imaging with a mouse model. The nanoparticles are biocompatible and may be attractive for clinical applications.
研究领域:
材料科学
·
医学影像学
·
纳米生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 21
·6754-6759
·
IF 7.393
Ziyu Yang,Jun-Yi Ge,Shuangchen Ruan,Hongzhi Cui,Yu-Jia Zeng
Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd2ZnTiO6, through static magnetization and heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change −ΔSM, and relative cooling power RCP are found to be 53.5 J K−1 kg−1 and 620.6 J kg−1, respectively, under a field change of 9 T at 3.1 K with a large adiabatic temperature change Tad of 23.7 K, far exceeding the commercial cryo-coolant Gd3Ga5O12 (GGG). The results suggest that Gd2ZnTiO6 is a potential working refrigerant material for the targeted liquefaction of helium.
研究领域:
材料科学
·
低温物理学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dewang Zeng,Fengwen Kang,Yu Qiu,Dongxu Cui,Min Li,Li Ma,Shuai Zhang,Rui Xiao
Supporting materials are often employed to enhance the stability of iron oxides oxygen carriers, but the reactivity is compromised for the dilution of the active phase. Here, we report several iron oxides supported by ionic conducting gadolinium-doped cerium oxides (GDC) for efficient chemical looping hydrogen production. The results show that GDC support can simultaneously improve redox stability and activity. Specifically, the produced Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ exhibits a high hydrogen production rate of ~0.71 mmol·g −1 ·min −1 and hydrogen yield of ~10 mmol·g −1 with negligible decay through 20 redox cycle. When using methane as the reducing agent, Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ shows high methane conversion of 75.67% and much lower carbon deposition than Fe 2 O 3 . The high performance is attributed to the improved oxide ion-conductivity through the oxygen carrier, which is further verified as the ability of the GDC support to accelerate the oxygen diffusion in the bulk. The explored support effects in this work can be extended to design oxygen carrier materials with both high activity and stability.
研究领域:
材料科学
·
能源化学
·
催化化学
·
无机化学
·
清洁能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·142505
·
IF 3.721
Wei Han,Wenjuan Wang,Mei Li,Yangyang Meng,Wenjing Ji,Yang Sun
To recover Gd from LiCl-KCl eutectic, the coreduction mechanism of Gd(III) with Pb(II) was investigated using electrochemical methods. The formation potentials related to the formation of three Gd-Pb intermetallics were detected by cyclic voltammetry, square wave voltammetry and chronopotentiometry, and the formation mechanism of Gd-Pb compounds could be described as xPb(II) + 2xe− = xPb. Meanwhile, the electroreduction of Gd on liquid Pb electrode was explored. The diffusion coefficient of Gd metal in liquid metallic Pb was determined by anodic chronopotentiometry. The kinetic parameters of Gd(III)/Gd(in Pb) couple in the temperature range from 723 K to 873 K were determined employing linear polarization (LP) method. Based on the relationship of exchange current density and temperature, the reaction activation energy was estimated to be 23.17 kJ mol−1. In addition, the recovery of Gd from molten salts was performed assisted by liquid Pb electrode by constant potential electrolysis (CPE) and constant current electrolysis (CCE). The products characterized using XRD, SEM with EDS are comprised of GdPb3 and Pb phases. The concentration change of Gd during CCE process was monitored by ICP-AES, and the recovery rate was estimated. The results showed that Gd concentration decreased and recovery rate increased with the duration.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
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