CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 3
·537-541
·
IF 1.071
Huang Sa,Han Qinghe,Wang Lei,Gong Tingting,Yuan Qinghai
Polyethylene glycol modified(PEGylated) NaGdF 4 (PEG-NaGdF 4 ) nanoparticles as a novel T 1 -weighted magnetic resonance imaging(MRI) contrast agent was successfully constructed by a one-pot hydrothermal synthesis method. Because of the functionalization of PEG, the nanoprobes had excellent dispersity, excellent stability and high biocompatibility. More importantly, the as-prepared PEG-NaGdF 4 nanoprobes revealed the high longitudinal relaxivity value and prominent T 1 -weighted MRI contrast performance, which was superior to the commercial MRI contrast agents. With the facile synthesis, excellent dispersity, outstanding stability, remarkable contrast performance and high biocompatibility, the PEGylated NaGdF 4 nanoparticles brought more opportunities to the new generation of nanoparticulate-based T 1 -weighted MRI contrast agents in clinic.
研究领域:
纳米技术
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材料科学
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生物医学工程
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磁共振成像
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 37
·17563-17576
·
IF 4.682
He Junjie,He Guo,Wang Panpan,Xu Lurun,Liu Jing,Tao Jingchao
In this work, new high-entropy RE 2 (Ce 0.2 Zr 0.2 Hf 0.2 Sn 0.2 Ti 0.2 ) 2 O 7 (RE 2 HE 2 O 7 , RE = La, Nd, Sm, Eu, Gd, Dy) ceramics were successfully prepared. RE 2 HE 2 O 7 ceramics exhibited a pyrochlore–fluorite dual-phase structure. For Sm 2 HE 2 O 7 ceramic, Ce 4+ with larger ionic radius was enriched in the fluorite phase, Sn 4+ and Ti 4+ with smaller ionic radii were enriched in the pyrochlore phase, while Zr 4+ and Hf 4+ with medium ionic radii existed in both phases. Compared with YSZ materials, RE 2 HE 2 O 7 ceramics exhibited a much lower glass-like thermal conductivity (1.19–1.68 W m −1 K −1 , 100–900 °C) and comparable thermal expansion coefficients (8.67–10.85 × 10 −6 K −1 , 1200 °C). Furthermore, due to grain refinement caused by the competition of two phases, the Vickers hardness (10.29–13.85 GPa) of RE 2 HE 2 O 7 ceramics is improved. The results indicate that dual-phase high-entropy RE 2 HE 2 O 7 ceramics are promising candidate materials for the next generation of thermal barrier coatings.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sen Peng,Lei Xiao,Lianwen Deng,Jun He,Yecheng Xi,Jiahui Zhu
In this work, two novel CaASbWO 8 (A = Gd, La; named CGSWO and CLSWO) microwave dielectric ceramics were synthesized by a classical solid-state method. Remarkably, the outstanding microwave dielectric properties ( ε r = 12.97, Q×f = 45,034 GHz, and τ f = −16.29 ppm/°C) were achieved for CGSWO ceramics sintered at 1440 °C, and CLSWO ceramics sintered at 1300 °C possessed the excellent microwave dielectric properties of ε r = 9.89, Q×f = 61,326 GHz, and τ f = 0.55 ppm/°C. Bond valence, ionic polarizability, Raman spectroscopy and Phillips–Vechten–Levine (P-V-L) theory were used to study the internal lattice vibration and chemical bonds in detail, and the dielectric properties were explored from the internal factors. In comparison to the ε r , the ε theo of CGSWO was found to be consistently underestimated, whereas CLSWO exhibited a contrasting pattern. This discrepancy was primarily attributed to the rattling and compressed effects of A-site cation. According to the analysis of P-V-L theory, W-O bond played an important role in regulating the Q×f value. Moreover, the τ f values of CGSWO and CLSWO ceramics were opposite, which provided an opportunity to manufacture microwave ceramic devices with good temperature stability.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Yiping Feng,Jingyi Wu,Haijian Lu,Wenhao Lao,Hongda Zhan,Longyong Lin,Guoguang Liu,Yirong Deng
The widespread application of rare earth elements (REEs) has raised concerns about their potential release into the environment and subsequent ingestion by humans. Therefore, it is essential to evaluate the cytotoxicity of REEs. Here, we investigated the interactions between three typical REEs (La, Gd, and Yb) ions as well as their nanometer/μm-sized oxides and red blood cells (RBCs), a plausible contact target for nanoparticles when they enter the bloodstream. Hemolysis of REEs at 50–2000 μmol L −1 was examined to simulate their cytotoxicity under medical or occupational exposure. We found that the hemolysis due to the exposure of REEs was highly dependent on their concentration, and the cytotoxicity followed the order of La 3+ > Gd 3+ > Yb 3+ . The cytotoxicity of REE ions (REIs) is higher than REE oxides (REOs), while nanometer-sized REO caused more hemolysis than that μm-sized REO. The production of reactive oxygen species (ROS), ROS quenching experiment, as well as the detection of lipid peroxidation, confirmed that REEs causes cell membrane rupture by ROS-related chemical oxidation. In addition, we found that the formation of a protein corona on REEs increased the steric repulsion between REEs and cell membranes, hence mitigating the cytotoxicity of REEs. The theoretical simulation indicated the favorable interaction of REEs with phospholipids and proteins. Therefore, our findings provide a mechanistic explanation for the cytotoxicity of REEs to RBCs once they have entered the blood circulation system of organisms.
研究领域:
毒理学
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纳米技术
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生物医学工程
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环境科学
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Zhen-Cheng Wu,Fang-Xu Tian,Rui Xiao,Mao-Yin Ran,Wenlong Liu,Wen-Tong Chen,Sheng-Ping Guo
The study of infrared nonlinear optical (NLO) materials with wide band gaps and high laser induced damage thresholds (LIDTs) is an urgent and challenging topic. Here, we report the NLO properties of CsRESiS4 (RE = Sm, Gd–Ho), which were synthesized by the reactive flux CsCl assisted RExOy–B–S routine. The structure of CsRESiS4, [CsS7] pentagonal bipyramids are orderly arranged to populate the interlayer space created by [RES7] monocapped triangular prisms consolidated [SiS4] tetrahedra. They all exhibit wide band gaps of 3.51–3.95 eV, high LIDTs of 3.6–5.5 × AGS, and NLO activity, with CsHoSiS4 possessing the largest band gap among rare-earth chalcogenides. The theoretical calculation results indicate that [RES7] monocapped triangular prisms are the main source of NLO activity and have a wide band gap. This work provides an effective case for exploring wide band gap infrared NLO materials.
研究领域:
材料科学
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凝聚态物理
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无机化学
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光学材料
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功能晶体
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2016
·
IF 4.82
Hui Yang,Chun-Li Hu,Jiang-Gao Mao
The first examples of mixed-anion lanthanide galloborates, namely, Ln2Ga[B3O6(OH)]2[B7O9(OH)2](CH3CO2)2 [Ln = Y (1), Sm (2), Eu (3), Gd (4), Dy (5)], have been obtained through hydrothermal synthesis. The title compounds are isomorphic and belong to monoclinic space group C2/c (No. 15). Their structures possess [B7O13(OH)2] borate layers further bridged with [B3O7] clusters to give a three-dimensional (3D) borate framework displaying two types of rhombus-like B14O14 14-membered-ring (14-MR) channels along the b axis. The Ga3+ ions are octahedrally coordinated and located at one end of the B14O14 14-MR channels, forming small tunnels of B7Ga 8-MRs, which are filled by the LnIII ions. The Ln ions and Ga cations are further held together by bridging acetate anions. It is worth noting that in these compounds there are two different types of borate clusters and two types of anions that are uncommon in the borates reported. Luminescent studies revealed the characteristic emission bands of Ln ions for compounds 2–5, and the luminescent lifetimes are 3.6, 0.86, and 3.05 ns for compounds 2, 3, and 5, respectively. Magnetic measurements suggest that there are antiferromagnetic interactions between magnetic centers for compounds 2–5.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Dawei Wen,Haoyuan Weng,Bin Xiao,Pan Wang,Ruijing Fu,Zhiwei Ma,Qingguang Zeng,Guanjun Xiao
Luminescence pressure sensors, valued for their remote sensing capability and high resolution, have been developed recently. However, most current sensors rely on a linear relationship between an optical property and pressure. We propose a nonlinear machine learning (ML) method to model the luminescence intensity ratio (LIR) as a function of pressure. The versatility and performance of this method are demonstrated using (Y,Gd)(Al,Ga) 3 (BO 3 ) 4 :Cr 3+ phosphors as luminescent pressure sensors. The relative sensitivities of the 2 E → 4 A 2 / 4 T 2 → 4 A 2 LIRs in (Y,Gd)(Al,Ga) 3 (BO 3 ) 4 :Cr 3+ range from 1.58%/GPa to 25.27%/GPa. The ML fitting demonstrates a superior performance compared to linear fitting, with lower mean absolute errors (0.0355–0.1499 GPa vs. 0.1209–0.6955 GPa) and higher R 2 values (99.70–99.98% vs. 93.69–99.79%). The ML fitting method is more suitable for modeling the nonlinear relationships between LIR and pressure than traditional linear fitting. The nonlinear ML fitting approach offers a powerful new way to model the relationships between luminescence features and various physical parameters.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Chengyu Ni,Chunyu Li,Zihao Xu,Wubin Dai
(Co)doping luminescent center(s) in a host is a universal strategy to photoluminescence (PL) modulations for extensive applications, yet its mechanism and interactions between structure and behavior in many phosphors remain ambiguous. Herein, via a facile sol–gel reaction method, differently tendentious occupations of Ce3+ in distinct crystallographic sites of K3YSi2O7 (KYS) lead to tunable PL in between blue and bluish-green under diverse excitations with high quantum efficiency. The generation of wide trap energy levels originating from heterovalent substitution Tb3+ → K+ could entrust Tb3+ as both PL and long-persistent PL (LPL) centers in green. Due to temperature-dependent filling/releasing rates of captured carriers, strong thermal-induced LPL could be obtained in KYS: Tb. By codoping Ce/Tb in KYS, multimode anticounterfeiting and information storage/encryption of KYS: Ce/Tb are realized with high security level via a screen printing technique. Because Ce and Tb possess different temperature-dependent quenching behaviors, optical temperature sensing is achieved with high absolute/relative sensitivity. To further enhance the KYS: Ce/Tb performance, trap depth engineering via equivalent substitution Gd → Y is further executed. The colorimetric/photometric analyses here provide new insights into designing novel stable and single-phased phosphor for applications in advanced anticounterfeiting technology and optical thermometry.
研究领域:
材料科学
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发光材料
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光学传感
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防伪技术
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信息存储
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固态化学
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光子学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2020
·Vol. 10
·期 4
·373
·
IF 3.52
Junjiao Zhang,Zhengru Zhu,Junchao Jiang,Hong Li
AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were synthesized by a simple ultrasound-assisted hydrothermal approach. We characterized the microstructure, surface morphology, and optical absorption capacity of the obtained samples. According to the characterization results, AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were successfully obtained. MFeO3nanospheres and AgI nanosheets were dispersed evenly on the surface of g-C3N4nanosheets. AgI/MFeO3/g-C3N4showed remarkable photocatalytic. Especially, 95% of NOF was photodegradated over AgI/LaFeO3/g-C3N4within 3 h and the higher photocatalytic performance still remained after six cycles. Additionally, The N2adsorption–desorption isotherms of AgI/MFeO3/g-C3N4showed that AgI/LaFeO3/g-C3N4possessed the highest specific surface area (79.32 m2/g). The result of scavenging experiment revealed that ·O2−, h+, and ·OH were the main roles in the photodegradation process. Benefitting from the nice energy band matching, MFeO3acted as the center of photogenerated electrons migration and separation provided more direct electron channels. This work proposes an effective approach for the design and configuration of dual Z-scheme photocatalysts to accomplish the removal of organic contaminants based on g-C3N4.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Wenjie Yang,Chao Han,Yuehua Li,Huizhu Zhou,Shan Liu,Ling Wang,Zhangxing He,Lei Dai
BaHf 0.8 Ln 0.2 O 3-δ doped with rare earth elements with different ionic radii (Ln = Yb , Y, Dy and Gd) as candidate materials for solid oxide fuel cells and H 2 separation membrane have been prepared. Their phase composition , sinterability , chemical stability and conductivity were studied systematically. The rare earth elements are successfully incorporated into the main phase crystal lattice of barium hafnate to generate a single perovskite phase. The relative density of all samples sintered at 1600 °C reaches above 90%, and Y-doped BaHfO 3 has the highest relative density (94.7%) and the biggest grain size (about 1 μm) among all samples. The conductivities of the samples firstly increase and then decrease with the increase of the doped ion radius. Among all samples the conductivity of BaHf 0.8 Y 0.2 O 3-δ is the highest and reaches 6.02 × 10 −3 S cm −1 in wet air at 700 °C, which is attributed to the good sinterability and suitable crystal structure (tolerance factor and free volume). All samples also show excellent chemical stability in the test atmospheres, including saturated H 2 O steam, pure H 2 and CO 2 , 200 ppm H 2 S/Ar and boiling water. The Pt/BaHf 0.8 Y 0.2 O 3-δ electrolyte/Pt single cell was fabricated with a 530 μm-thick disk and its electrochemical properties were tested. The peak power density reaches 10.21 mW cm −2 at 700 °C, which is comparable to similar fuel cells reported. These results suggest that BaHf 0.8 Y 0.2 O 3-δ is a promising electrolyte candidate for proton-conducting fuel cells.
研究领域:
材料科学
·
能源工程
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高影响因子
Nuclear Engineering and Technology
·
2022
·
IF 2.817
Yan Wang,Jin Wang,Xue Zhang,Nan Li,Junxia Wang,Xiaofeng Liang
Series of unequal quantity Nd/Ce co-doped ceramic nuclear waste forms, (Gd, Nd) 2 (Zr, Ce) 2 O 7 , were prepared to tailor its ordered pyrochlore or disordered fluorite structure. The phase transition, microtopography, and elemental composition of the ceramic samples were systematically investigated, especially the effect of order-disorder structure on the chemical stability. It was confirmed that unequal quantity of Nd/Ce could synchronously replace the Gd/Zr-sites of Gd 2 Zr 2 O 7 . And the phase transition of order-disorder structure could be successfully tailored by regulating the average cationic radius ratio of (Gd, Nd) 2 (Zr, Ce) 2 O 7 series. The elements of Gd, Nd, Zr, and Ce are uniformly distributed in the ordered or disordered structures. The MCC-1 leaching results showed that (Gd, Nd) 2 (Zr, Ce) 2 O 7 pyrochlore ceramic nuclear waste forms had excellent chemical stability, whose elements' normalized leaching rates were as low as 10 −4 -10 −7 g‧m −2 ‧d −1 after 7 days. In particular, the chemical stability of disordered structure was superior to that of ordered structure. It was proposed that the force constant and the closest packing were changed with the structure transformation resulting the chemical stability difference.
研究领域:
材料科学
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核能工程
·
无机化学
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DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2024
·
IF 4.5
Dinghu Weng,Rong Guo,Changling Dong,Yuan Luo,Dasheng Qiu,Liying Xu,Guobin Xu
The aim of this study was to synthesize a quinoline-based MRI contrast agent, Gd-DOTA-FAPI04, and assess its capacity for targeting fibroblast activation protein (FAP)-positive tumors in vivo. Gd-DOTA-FAPI04 was synthesized by attaching a 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) complex of gadolinium(III) to FAP inhibitor FAPI04. The longitudinal relaxation time (T1) of the contrast agent was measured using a Siemens Prisma 3.0T MR system, and the CCK-8 assay was performed to evaluate its potential cytotoxicity. Male nude mice bearing tumors grown from FAP-expressing fibrosarcoma cells were divided into experimental (n = 4) and control (n = 4) groups, and T1-weighted image enhancement was measured at different times (0, 10, 30, 60, 90, and 120 min) postinjection of Gd-DOTA-FAPI04. The control group received an additional preinjection of excess FAPI04. FAP expression in tumor tissue was investigated by using immunohistochemistry with an anti-FAP antibody. The longitudinal relaxivities of gadodiamide and Gd-DOTA-FAPI04 were measured to be 3.734 mM–1 s–1 and 5.323 mM–1 s–1, respectively. The CCK-8 assay demonstrated that Gd-DOTA-FAPI04 has minimal toxicity to cultured human fibrosarcoma cells. In vivo MRI showed that peak accumulation of Gd-DOTA-FAPI04 in FAP-expressing tumors occurred 1 h postinjection and could be blocked by preinjection of excess FAPI04. Immunohistochemical analysis of harvested tumor tissue supported the above findings. Gd-DOTA-FAPI04 is a promising contrast agent for in vivo imaging of FAP.
研究领域:
医学成像
·
肿瘤学
·
药物化学
·
分子生物学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）