MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Hai Wu,Youjin Zhang,Maozhong Zhou,Chengpeng Yao,Xianjin Ge
Large single crystals of gadolinium hydroxide [Gd(OH) 3 ] in the length of several millimeters were successfully prepared by using solid KOH assisted hydrothermal method. Gd(OH) 3 samples were characterized by X-ray diffraction (XRD), 4-circle single-crystal diffraction, Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). FESEM image shows hexagonal prism morphology for the Gd(OH) 3 large crystals. The possible growth mechanism of Gd(OH) 3 large single crystals was proposed. The photoluminescence and magnetic properties of Gd(OH) 3 species were investigated.
研究领域:
材料科学
·
光学
·
磁学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hongru Jin,Chong Wei,Haozhen Li,Xiaoqiang Li
Internal crystallization is a significant process in the preparation of glass-ceramics (GCs). The glass phase is one of the important factors affecting the internal crystallization process within GCs. In this study, Gd 2 Ti 2 O 7 pyrochlore GCs with different borosilicate glass systems were prepared via an oxide route and consolidated via a cold-pressing and sintering process to be used as waste forms for actinide immobilization. After sintering at 1250°C, it was confirmed that the pyrochlore phase (Gd 2 Ti 2 O 7 ) was the major immobilization phase, while the apatite phase (Gd 9.33 (SiO 4 ) 6 O 2 ) was a minor phase. The influence of glass composition on the minor phase formation and pyrochlore grain growth was also investigated. The content of the minor phase (Gd 9.33 (SiO 4 ) 6 O 2 ) in GCs showed a positive correlation with the content of non-bridging oxygen (NBO) in the glass systems. Meanwhile, the average grain size of the pyrochlore phase also exhibited a positive correlation with the NBO content, highlighting the influence of glass composition on the grain growth process. In addition, static leaching tests confirmed that all GCs exhibited high chemical durability with normalized Gd and Ti leach rates ranging from ∼10 -4 -10 -5 g m -2 d -1 after 28 days. However, preferential leaching of the glass phase was observed in GCs during the leaching tests. Glasses with higher NBO content exhibited more severe alterations from leaching, evidenced by significantly higher leach rates of glass-forming elements such as Si and B. Surface analysis revealed that the GCs surface experienced breakage and peeling, with damage on the glass phase ranging from ∼200 nm to 700 nm.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Xin Wang,Min Xue,Songbai Liu,Kuo Jiang
In this paper, (Gd 1− x Ce x ) 2 Zr 2 O 7+ x immobilized matrices with high cerium (Ce) amount-of-substance fractions (up to 90%) were prepared by sol-spray pyrolysis , and then sintered at 1600 °C in air. XRD results showed that all samples were in a mixture of pyrochlore and fluorite phase, even after sintering at 1600 °C. All the sintered bulks were dense, and the densities were independent of the additive content . The SEM results showed that all samples were chemically homogeneous. There was no segregation in the grain boundary. EDS quantification yielded a mean composition close to the stoichiometric chemical composition.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2018
·Vol. 14
·期 6
·1117-1124
·
IF 5.068
Hu Meixin,Qi Jianrong,Ruan Jing,Shen Guangxia
Carbon dots, as a potential substitute for semiconductor quantum dots, have drawn great interest in recent years. The preparation of fluorescent carbon dots has been made easy with many significant advances, but the complicated purifying processes, low quantum yield, and blue emission
wavelength still limit its wider application in biosensors, biomedicine, and photonic devices. Here we report a strategy to synthesis Gd-doped carbon dots (Gd-Cdots) of super-high quantum yield with a microwave assisted hydrothermal method. The Gd-Cdots, with a diameter of 47∼8 nm, can
be purified easily with conventional centrifugal techniques. Carbon microparticles (CMPs) have also been synthesized with a similar procedure. Meanwhile, we demonstrated a novel "turn-off-on" fluorescent biosensor, which has been developed for highly sensitive detection of glucose using Gd-doped
carbon dots as probes. The proposed biosensor has exhibited low-cost and non-toxic properties, with high sensitivity and good specificity. In addition, the results in real blood samples further confirmed it as a promising application in diabetes diagnosis.
研究领域:
生物传感
·
医学诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2019
·
IF 6.638
Ying Li,Yu Cao,Lai Wei,Jinjie Wang,Min Zhang,Xuexia Yang,Wenshuo Wang,Guang Yang
Protein-templated gold nanoclusters have attracted attention in fluorescence imaging due to their simple synthesis and good biocompatibility. However, limitations still exist such as poor colloid stability and undesirable fluorescence intensity. Here we describe the self-assembly of keratin-templated gold nanoclusters via a simple and mild preparation process, including keratin-templated synthesis of gold nanoclusters (AuNCs@Keratin), silver ions modification of AuNCs@Keratin (AuNCs-Ag@Keratin), and gadolinium ions-induced aggregation of AuNCs-Ag@Keratin (AuNCs-Ag@Keratin-Gd). It was demonstrated that the AuNCs-Ag@Keratin-Gd obtained an enhanced fluorescence intensity (6.5 times that of AuNCs@Keratin), high colloid stability for more than 4 months, and good biocompatibility. Moreover, the AuNCs-Ag@Keratin-Gd holds promise in multifunctional applications such as near-infrared (NIR) fluorescence imaging, magnetic resonance (MR) imaging, and redox-responsive drug delivery, extending the applicability of fluorescent gold nanoclusters, especially in biomedical fields. Statement of significance Assembly-induced fluorescence enhancement has been rarely reported on as it relates to the protein-templated gold nanoclusters (AuNCs). In this work, self-assembly of protein-templated AuNCs was developed for enhanced fluorescence intensity and multifunctional applications, including bioimaging and responsive drug delivery. A cysteine-rich protein, keratin , was utilized as the template to synthesize AuNCs, which underwent silver ion modification and gadolinium ion-induced aggregation. The silver modification of the keratin-templated AuNCs facilitated the formation of a dense aggregate after gadolinium ion-induced assembly, thus generating an enhanced fluorescence intensity. Such a mechanism was confirmed by fluorescence correlation spectroscopy analysis. We believe that this work will extend the applicability of the fluorescent gold nanoclusters, especially in biomedical fields, and provided an effective approach for the mechanism analysis of the assembly-induced fluorescence enhancement via fluorescence correlation spectroscopy.
研究领域:
生物医学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhuyao Li,Liandi Zhu,Hui Liu,Yuzhi Lin,Dandan Tang,Limin Zhou,Ying Dai,Zhi Gao,Feiqiang He,Kai Guo,Neng Yu,Zhirong Liu
The highly effective separation of two adjacent rare earth is significant to the rare earth and nuclear industries. This paper investigates the highly effective separation of Gd over Eu using liquid lead–bismuth eutectic (LBE) alloy cathode in molten LiCl-KCl-EuCl 3 -GdCl 3 by pulse potential electrolysis (PPE). Underpotential deposition of Eu and Gd is observed on the LBE alloy, with a depolarization value far greater than that of the liquid Pb electrode. Furthermore, the higher exchange current density and the lower activation energy of the electrode reaction indicate that the LBE alloy cathode has higher kinetic performance than the liquid Pb. Then, the practical electro-separation in LiCl-KCl-EuCl 3 -GdCl 3 systems is carried out by applying different electrolysis technology. The effects of varying electrolysis methods and parameters on separation factor ( SF ), extraction efficiency, cathode product morphology, and crystal size are studied and compared. The results show that both the extraction efficiency and the separation factor obtained by the PPE are the largest. The calculated extraction efficiency of Gd and the actual separation factor SF Gd/Eu of Gd/Eu could be up to 99.1 % and 759, respectively.
研究领域:
材料科学
·
核工业
·
稀土分离技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2363
·
IF 4.6
Zhongtao Li,Guiqiang Qi,Guangyue Shi,Meng Zhang,Haifeng Hu,Liguo Hao
The application of magnetic resonance imaging (MRI) nano-contrast agents (nano-CAs) has increasingly attracted scholarly interest owing to their size, surface chemistry, and stability. Herein, a novel T1 nano-CA (Gd(DTPA)−GQDs) was successfully prepared through the functionalization of graphene quantum dots with poly(ethylene glycol) bis(amine) and their subsequent incorporation into Gd-DTPA. Remarkably, the resultant as-prepared nano-CA displayed an exceptionally high longitudinal proton relaxivity (r1) of 10.90 mM−1s−1(R2= 0.998), which was significantly higher than that of commercial Gd-DTPA (4.18 mM−1s−1, R2= 0.996). The cytotoxicity studies indicated that the Gd(DTPA)−GQDs were not cytotoxic by themselves. The results of the hemolysis assay and the in vivo safety evaluation demonstrate the outstanding biocompatibility of Gd(DTPA)−GQDs. The in vivo MRI study provides evidence that Gd(DTPA)−GQDs exhibit exceptional performance as T1-CAs. This research constitutes a viable approach for the development of multiple potential nano-CAs with high-performance MR imaging capabilities.Keywords:graphene quantum dots;magnetic resonance imaging;gadolinium;enhanced relaxivity
研究领域:
医学影像学
·
纳米医学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Weiquan Zhan,Yuan Yuan,Qizheng Weng,Yanan Pan,Shaoxian Song,José Luis Arauz-Lara,Feifei Jia,Wencai Zhang
Separation and recovery of trace gadolinium(III) from rare earth elements (REEs) with similar properties is increasingly crucial for renewable energy resources and sustainable development. This study proposed a method to regulate the chemisorption activity of gadolinium(III) using defects-rich molybdenum disulfide (DR-MoS 2 ) electrodes, enabling the separation and recovery of gadolinium(III) from aqueous solutions. Lanthanum(III), gadolinium(III), and yttrium(III), representing light, medium, and heavy REEs respectively, were selected to investigate their adsorption behaviors of on MoS 2 and DR-MoS 2 electrodes at low concentrations. Experiments and simulation results verified distinct adsorption behaviors of REEs on MoS 2 , influenced by their out-shell electron binding capabilities. Interestingly, gadolinium(III) exhibited a unique interaction where its f orbitals strongly interacted with p orbitals of unsaturated sulfur atoms, unlike the other REEs, facilitating effective separation and recovery of gadolinium(III). Furthermore, increased binding affinity enhanced the electric double layer capacity (EDLC) and reduced electrons immigration resistance. Consequently, DR-MoS 2 electrodes achieved 100% recovery of trace gadolinium(III) recovery with high separation efficiency. Hopefully, strongest lanthanum(III) interaction with unsaturated Mo atoms was expected to realize lanthanum(III) separation and recovery. This study presented a promising approach to selectively recover target REEs from similar elements through modulating the chemisorption.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115554
·
IF 1.449
Tao Wang,Xiaoou Sun,Duanting Yan,Guodong Zhang,Dejun Wang,Jing Leng,Runru Liu
In this work, the effect of grain size and uniformity of the precursor powder on the electrical property of ceria based electrolytes was investigated. Gadolinia-doped ceria (GDC) samples were treated under different calcination temperatures (600 °C and 1300 °C), where their grain size and uniformity were adjusted by varying the ratio of 1300 °C powder in precursors. The phase composition, morphology and conductivities of mixed GDC samples were characterized by x-ray diffraction (XRD), scanning electron spectroscopy (SEM) and AC impedance, respectively. XRD results revealed that all GDC samples are single cubic fluorite-type structures. As the content of 1300 °C powder increased, the grain boundary conductivity first dropped markedly to the minimum at the ratio x = 5% and then basically unchanged, whereas no significant change was observed in bulk conductivity. Our study demonstrated that the ratio of the higher calcination temperature powder in the mixed precursor powder gave rise to the variation of grain size uniformity and the electrical properties of GDC samples.
研究领域:
材料科学
·
固态离子学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2021
·Vol. 13
·期 7
·1364-1373
·
IF 1.474
Zhang Yumei,Pei Ruina,Luo Tao
ABSTRACT
The development of nanomaterials, especially the development of multi-modality imaging nanoprobe technology has become a reality for tumor imaging diagnosis. In this study, the gadolinium ion chelating agent (2,2′,2′′-(10-(2-(2, 5-dioxopyrrolidin-1-oxyl)-2
oxoethyl)-1, 4, 7, 10-tetraazacyclododecane-1, 4, 7-tri)triacetic acid) (DOTA-NHS) and polyethylene glycol (PEG)-modified targeting ligand PEG-folic acid (FA) were grafted onto the PEG-modified fifth-generation polyamide-amine dendrimer (P5-NH2), which were undertaken as standards
to wrap gold nanoparticles. Then, remaining amino group was acetylated to acquire Gd–Au DENPS-FA nanoparticles. Biocompatibility and cytotoxicity of nanoparticles were analyzed while characterizing them. The cases with unidentified tumors (mass diameter >4.5 cm) of abdominal or pelvic
origin were selected and used for clinical study of computed tomography (CT)/magnetic resonance imaging (MRI) dual-modality abdominal tumors. In the test, average particle size of Gd-Au DENPs-FA nanoparticles was 4.2 nm, and they had good water solubility and stability in aqueous solution.
When concentration of Au+ nanoparticles increased, the cell morphology remained normal, only a small number of round cells appeared, and the cell activity remained above 80%. GD-Au DENPs-FA nanoparticles had a good targeting specificity for KB cells with high folate receptor expression.
During 6–24 hours of injection, the signal at the tumor site of the patient was enhanced markedly, namely the targeted gold nanoparticles were bound to the tumor tissue and the metabolic rate was slow. Based on this material, CT/MRI imaging could be performed in the patient’s body
and further used for the early diagnosis of abdominal tumors.
研究领域:
医学影像学
·
纳米生物学
·
肿瘤学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·9611-9617
·
IF 2.936
Ji-Wei Shen,Zhiqing Wang,Xiaoxuan Wei,Jiawei Liu,Yinmao Wei
Herein, user-friendly control of the synthesis of sub-10 nm hexagonal (β-) NaYbF4:Er nanocrystals (NCs) with extremely low-level Gd3+ doping (0%, 10 mol%) was achieved. We reveal for the first time that the effective sodium/fluoride levels during the formation of cubic (α-) nuclei are not only controlled by the sodium/fluoride to rare-earth precursor ratios used, but also sensitively restricted by the in situ NaF generation reaction in a sodium oleate-based solvothermal system. Excessive in situ NaF generation will lead to a respective sodium- and fluoride-deficient environment, delayed α-to-β transition and larger β-NCs. Based on these effects, sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er was obtained with a user-friendly low fluoride dosage by finely balancing this NaF generation reaction and achieving an intrinsic optimized sodium-fluoride level for NC nucleation. Notably, our work represents the first example where the focus is on the competing in situ NaF generation reaction and its use for nucleation regulation, as well as for the user-friendly control of the solvothermal synthesis of sub-10 nm β-NaYbF4:Er.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Lei Yu,Kuibao Zhang,Weiwei Li,Baozhu Luo
In this study, Sm-doped Gd 2 Zr 2 O 7 transparent ceramics were successfully prepared by high temperature vacuum sintering using combustion synthesized nanopowders . X-ray diffraction, solid ultraviolet absorption spectrophotometer and fluorescence spectrometer were employed to investigate the structural evolution and photoluminescence properties of as-prepared samples. The Sm-doped Gd 2 Zr 2 O 7 nanopowders are in defective fluorite structure, which transforms into pyrochlore structure after high temperature sintering . The 3% Sm-doped sample exhibits high in-line transmittance of 74.7% at the wavelength of 1000 nm. The fluorescence lifetimes of all samples excited at 404 nm and detected at 615 nm are in millisecond scale, and the concentration quenching occurs when the Sm doping concentration reaches to 10%.
研究领域:
材料科学
·
光学
✓ 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）