Journal of Physical Chemistry C
·
2014
·
IF 4.835
Bing Chen,Xvsheng Qiao,Dengfeng Peng,Xianping Fan
In this study, hexagonal-phase NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were synthesized via a mild solvothermal method. By modifying the Eu3+ dopant concentration, the crystal phase, morphology, and luminescent properties were well controlled. A broad excitation band centered at around 260 nm corresponding to the 2F5/2 → 4f-5d transition of Ce3+ was detected in the hosts containing Gd3+ ions by monitoring the Eu3+ emissions, indicating that an efficient Ce3+ → Eu3+ energy transfer occurred via the Gd3+ sublattice. Luminescence decay behaviors of the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were studied, and the energy transfer mechanism was discussed. An obvious rising edge on the luminescence decay curve of Eu3+ ions in the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods was observed. The rising time is proposed to describe the energy migration time from Ce3+ to Eu3+ via the Gd3+ sublattice.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Biao Lu,Yingbang Yao,Xiaodong Jian,Tao Tao,Bo Liang,Q.M. Zhang,Sheng-Guo Lu
The electrocaloric effect (ECE) in gadolinium and tin ions doped lead lanthanum zirconate titanate ceramics was investigated. Five samples with different compositions and hence different relaxor behaviors and polarization properties were prepared via a conventional solid-state reaction process. The ECE was measured directly by a high resolution thermometer from 293 K to 423 K. The results show that the ECE is mainly determined by the number of polarization states and polar-correlation strength . Furthermore, the results reveal that the temperature variation of ECE around Curie temperature is associated with the generation rate, activation energy , size and freezing temperature of polar nanoregions. As a result, Sn doped PLZT composition exhibits the best ECE, i.e. , a peak ΔT > 2 K obtained at 5 MV/m, and ΔT > 1.78 K achieved in the whole temperature range measured at the same field, which are very attractive for high performance ECE devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
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
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Anish Bhattacharya,Xiangfeng Chu,Qi Gao,Xue Li,Yongping Dong,Shiming Liang,Amit K. Chakraborty
Ethanol sensing is an important area of research given its relevance to human health, traffic control and various industries. Metal oxide semiconductor nanostructures are most commonly used as gas sensors. In this study, enhanced ethanol sensing properties were obtained by incorporation of Gd 3+ ions into Barium Stannate (GBSO), a bimetallic oxide microrods prepared through a simple co-precipitation method. The GBSO films, when exposed to ethanol, showed that incorporation of Gd improved the sensing response till 3 wt% of Gd (3GBSO) loading while further increase in Gd content resulted in reduced response. 3GBSO sample showed response as high as 76 to 500 ppm of ethanol vapor at an operating temperature of 220 °C along with a very low detection limit of 0.1 ppm (response of 1.5). Good repeatability and moderate stability were also observed suggesting its potential as low-cost ethanol sensor. Significant increase in both specific surface area as well as oxygen content (as measured by x-ray photoelectron spectroscopy) was observed in 3GBSO sample compared to that of BSO. Thus, we showed that incorporation of Gd improved the surface area of BSO microrods and in turn the surface adsorption of oxygen which led to their enhanced response to ethanol.
研究领域:
材料科学
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传感器技术
✓ 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
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Hua Yongquan,Pu Guojuan,Ou Caiwen,Zhang Xiaoli,Wang Ling,Sun Jiangtao,Yang Zhimou,Chen Minsheng
Here we report a supramolecular hydrogel based on Gd(III)-peptide complexes with dramatically enhanced magnetic resonance (MR) performance. The hydrogelations were formed by adding Gd(III) ion to the nanofiber dispersion of self-assembling peptides naphthalene-Gly-Phe-Phe-Tyr-Gly-Arg-Gly-Asp (Nap-GFFYGRGD) or naphthalene-Gly-Phe-Phe-Tyr-Gly-Arg-Gly-Glu (Nap-GFFYGRGE). We further showed that, by adjusting the molar ratio between Gd(III) and the corresponding peptide, the mechanical property of resulting gels could be fine-tuned. The longitudinal relaxivity (r 1 ) of the Nap-GFFYGRGE-Gd(III) was 58.9 mM −1 S −1 , which to our knowledge is the highest value for such peptide-Gd(III) complexes so far. Such an enhancement of r 1 value could be applied for enzyme detection in aqueous solutions and cell lysates.
研究领域:
生物材料学
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医学影像学
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生物化学
✓ 已验证
DOI
高影响因子
BIOMATERIALS
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2016
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IF 8.387
Wenxiu Hou,Fangfang Xia,Gabriel Alfranca,Hao Yan,Xiao Zhi,Yanlei Liu,Chen Peng,Chunlei Zhang,Jesus Martinez de la Fuente,Daxiang Cui
It is essential to develop a simple synthetic strategy to improve the quality of multifunctional contrast agents for cancer diagnosis. Herein, we report a time-saving method for gadolinium (Gd 3+ ) ions-mediated self-assembly of gold nanoclusters (GNCs) into monodisperse spherical nanoparticles (GNCNs) under mild conditions. The monodisperse, regular and colloidal stable GNCNs were formed via selectively inducing electrostatic interactions between negatively-charged carboxylic groups of gold nanoclusters and trivalent cations of gadolinium in aqueous solution. In this way, the Gd 3+ ions were chelated into GNCNs without the use of molecular gadolinium chelates. With the co-existence of GNCs and Gd 3+ ions, the formed GNCNs exhibit significant luminescence intensity enhancement for near-infrared fluorescence (NIRF) imaging, high X-ray attenuation for computed tomography (CT) imaging and reasonable r1 relaxivity for magnetic resonance (MR) imaging. The excellent biocompatibility of the GNCNs was proved both in vitro and in vivo . Meanwhile, the GNCNs also possess unique NIRF/CT/MR imaging ability in A549 tumor-bearing mice. In a nutshell, the simple and safe GNCNs hold great potential for tumor multi-modality clinical diagnosis.
研究领域:
纳米医学
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生物医学工程
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分子影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ming yang,Yuxin Zhou,Dandan Zhang,Fang Zhou,Hui Ning,Maoxia He,Ru-an Chi,Weiyan Yin
Developing a high-performance adsorbent for the recovery of Gd(III) from wastewater is of great environmental and economic significance. Metal organic frameworks (MOFs) functionalized with mixed-linker defect strategy hold huge potential for use as adsorbents for removing heavy metal ions from wastewater. However, the defective MOFs still show a relative low selectivity to target metal ions. Herein, we propose the combination of surface-imprinting and defect engineering strategies to synthesize Gd(III) ion-imprinted polymers (G-IIPs) based on mixed-linker Zr-MOFs, and apply them for capturing Gd(III) ions from wastewater. It is worth noting that 2-hydroxyphosphonoacetic acid not only served as monodentate ligand to in-situ induce ligand vacancies and form hierarchical pores on UiO-66-NH 2 , but also as high-efficient functional monomer in imprinted layer to provide the strong coordination ability towards Gd(III). Benefiting from its abundant binding sites and hierarchical pore structure, the as-prepared G-IIP-3 with rich defects displays a high adsorption capacity of 181.75 mg·g −1 and a short equilibration time of 30 min for Gd(III). In addition, G-IIP-3 presents highly selective capture of Gd(III) over interfering ions. Furthermore, density functional theory calculation demonstrates that both phosphate group and Zr-O cluster play key roles in the Gd(III) adsorption process. Thus, this work provides an effective method to develop high-performance materials for Gd(III) recovery by organically combining the advantages of surface-imprinting and defect engineering strategies.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2024
·
IF 1.7
Yuwei Chen,Wang Liu,Zuhua Chen,Zhenxing Li,Jun Shen,Heng Tu,Guochun Zhang
High-quality Na 2 Gd 2 (BO 3 ) 2 O crystals have been successfully grown using the top-seeded solution growth method (TSSG), employing a Na 2 O - NaF - B 2 O 3 flux system with optimal molar ratios of Na 2 Gd 2 (BO 3 ) 2 O : Na 2 CO 3 : NaF : H 3 BO 3 = 1:2:6:4. The magnetic and magnetocaloric properties were investigated including magnetic susceptibility ( χ ), magnetization ( M ), and isothermal magnetic entropy change ( −ΔS m ) measurements. Na 2 Gd 2 (BO 3 ) 2 O exhibits a large magnetocaloric effect with a maximum − ΔS m of 41.6 J·kg −1 ·K −1 at 2 K and 7 T, which is higher than that of commercial Gd 3 Ga 5 O 12 (GGG, −ΔS m = 38.4 J·kg −1 ·K −1 at 2 K and 7 T) and most other Gd 3+ -based borates, showing the potential application in the field of magnetic refrigeration.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 11
·7820-7828
·
IF 4.449
Xiao Sun,Chuanjie Cai,Qian Wang,Dongqing Cai,Junchao Qian,Yu Chi,Kang Zheng,Xin Zhang,Guilong Zhang,Kai Zhong,Zhengyan Wu
A wormstructured and nanosized porous/hollow polyethyleneimine (PEI) functionalized Gd2O3/Fe3O4 composite was fabricated as a drug carrier and a bioimaging agent. The effect of PEI's chain length on the size and morphology of the nanoworm was investigated and the results indicated that the nanoworm modified with PEI (10 000 molecular weight) (designated as p-nanoworm) possessed a suitable size and a porous/hollow structure. Meanwhile, the p-nanoworm could effectively prevent the leakage of Gd ions under different pH conditions because of plenty of amino groups on their surface. Compared with contrast agents of clinical use, the p-nanoworm displayed MR enhancement with a high r1 relaxivity of 5.58 s−1 mM−1 per gadolinium atom. Cisplatin (CDDP), a clinical anticancer drug, could be easily loaded into the pores and lumen of the p-nanoworm (p-nanoworm-CDDP) and also controllably released by adjusting the pH value. Cell assay suggested that the p-nanoworm possessed satisfactory biocompatibility and meanwhile could promote CDDP uptake of HeLa cells and enhance the inhibition effect on HeLa cells. In addition, p-nanoworm-CDDP showed a negligible cytotoxicity on normal human cells, indicating that the side effect of CDDP is reduced. Thus, the p-nanoworm could have a potential application for the diagnosis and therapy of cancer.
研究领域:
医学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Xiuling Wang,Yanli Shi,Zhonghua Lu,Cong Zhang,Ruichong Chen,Jianqi Qi,Tiecheng Lu
Whether adding Gd 3+ in Yb:GdYAG broadens absorption and emission peaks for better laser performance is recently under debate. By preparing (Yb 0.05 Y 0.95-x Gd x ) 3 Al 5 O 12 (x = 0.2, 0.6, 1, 5, 10, 20 at%) transparent ceramics with one-step solid-state reactive sintering under vacuum, we report a non-monotonic relation between increasing Gd 3+ content and micro-structure/properties. Specifically, the grain size decreases till x = 10 at%, but increases at 20 at% with secondary phases formed at grain boundaries by segregated Gd 3+ . The optimal optical properties are achieved at 10 at%. The in-line transmittance reaches 83.9 % at 1100 nm. Absorption and emission cross-sections are significantly broadened (8.0 × 10 −21 cm 2 at 940 nm and 26.7 × 10 −21 cm 2 at 1030 nm, respectively). The FWHM of main emission peak at 1030 nm receives a ∼60 % extension to 15.2±0.4 nm. It indicates lattice Gd 3+ broadens peak widths and improves transparency, while segregated Gd 3+ diminishes peak broadening and adversely affects transparency.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yuzhe Zhang,Tingting Bian,Rong Jiang,Yi Zhang,Xudong Zheng,Zhongyu Li
High selective recovery of Gd(Ⅲ) from end-of-life rare earth productions is essential for cleaner production. Chitosan(CS), a biomaterial, has shown excellent results in water treatment . The amino and hydroxyl groups on the surface of CS play a vital role in adsorbing metal ions . Polydopamine has good stability, strong water dispersibility, and excellent biocompatibility. As a bio-crosslinking agent, the amino and phenolic hydroxyl groups on its surface can be combined with metal ions to help the material absorb metal ions. This paper combines the active groups of biomimetic materials and the mechanical properties of new nanomaterials multi-walled carbon nanotubes and graphene oxide, and prepared a high-performance chitosan-based aerogel MWCNT-PDA-CS-GO through heat and mass transfer at low temperature and low pressure. The adsorption mechanism of MWCNT-PDA-CS-GO for Gd(Ⅲ) was analyzed through a series of characterization and adsorption experiments. At pH 7.0, the maximum adsorption capacity of aerogel for Gd(Ⅲ) reached 150.86 mg g −1 . The relative selectivity of imprinted ions is 48.02 times higher than other ions. All the results indict MWCNT-PDA-CS-GO aerogel exhibits excellent selectivity and stability for effective recovery of Gd(Ⅲ).
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 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）