JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2727-2740
·
IF 3.094
Fushuo Wu,Peng Wu,Yunxuan Zhou,Xiaoyu Chong,Jing Feng
In this work, RENbO 4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo-mechanical properties indicate that RENbO 4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X-ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high-temperature solid-state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO 4 ceramics. The Young's modulus and hardness of the RENbO 4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60-170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO 4 ceramics to failure and damage. Lower thermal conductivity (1.42-2.21 W [m k] −1 at 500°C-900°C) and lower density (5.330-7.400 g/cm 3 ) than other typical TBCs materials give RENbO 4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO 4 ceramics reach 9.8-11.6 × 10 −6 k −1 and are comparable or higher than other typical TBCs materials. According to the first-order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO 4 ceramics can be observed.
研究领域:
材料科学
·
固体力学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yongxiang Wang,Guocan Shen,Ting Tang,Jinming Zeng,Rizwan Ur Rehman Sagar,Xiaopeng Qi,Tongxiang Liang
Electrochromic capacitors are attracting a huge attention due to their dual functions in energy-saving and energy storage. Electrochromic and energy storage performance of the films could be effectively improved through regulating their physical phase and morphology. In the present work, the physical phase and morphology of the WO 3 nanofilms were regulated by doping RE ions (RE = Ce, Eu, Sm, Gd) using one-step hydrothermal technology. The three-dimensional (3D) urchin-like crystal WO 3 nanofilm would transfer into the 3D nest-like WO 3 (WO 3 -RE) nanofilms that consisted of crystal and amorphous phase by doping RE ions. Compared with the pure WO 3 nanofilm, the WO 3 -RE nanofilms exhibited higher optical contrast, faster switching speed, longer cyclic stability, and larger areal capacitance owing to faster ions transfer rate and more stable film structure. The optical contrast of WO 3 -Eu and WO 3 -Sm nanofilms were 76.3% and 73.8% at 633 nm, 75.5% and 74.6% at 900 nm wavelength, respectively. Notably, the WO 3 -Eu and WO 3 -Sm nanofilms could retain 99.6% and 99.1% of their original optical contrasts after 1000 cycles, respectively. Additionally, the areal capacitance of ECDs based on the WO 3 /PB, WO 3 -Ce/PB, WO 3 -Eu/PB, WO 3 -Sm/PB, and WO 3 -Gd/PB were 26.15, 49.27, 58.23, 71.46, and 79.52 mF/cm 2 at 0.3 mA/cm 2 , respectively. ECDs based on the WO 3 -RE/PB are promising for energy-saving and energy storage dual functional smart windows.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 30
·6390-6401
·
IF 5.344
Tingting Zhou,Guofeng Wan,Bao Li,Lixin Wu
This article describes the fabrication of nanosized paramagnetic drug carriers via the assembly of a pH-responsive hydrophilic block copolymer poly(polyethylene glycol methyl ether methacrylate)-b-poly(methacrylic acid-co-trimethyl ammonium bromide propyl methacrylate) (PPMT) and polyoxometalate K13[Gd(β2-SiW11O39)2] (GdSiW11) through electrostatic interaction. Owing to the hydrophilicity, large molecular weight, and high content of the GdSiW11 cluster bearing in the nanocomposites, the organic–inorganic nanocomposite exhibited an impressive longitudinal relaxivity as a contrast agent for magnetic resonance imaging (MRI). The surplus negative charges from the polyoxometalate cluster in the polymer nanocomposites facilitated the capture of the anti-tumor drug doxorubicin (DOX). The DOX-loaded nanocomposites were stable under the physiological environment, whereas a responsive release of DOX was achieved at pH values similar to the tumor microenvironment due to the regulation of the polyoxometalate and carboxyl groups. The DOX-loaded PPMT2–GdSiW11 nanocomposites were observed to enrich effectively at tumor sites through MRI after intravenous injection. Furthermore, the DOX-loaded composites manifested enhanced in vivo anti-tumor therapeutic efficacy and sustainable circulation time of more than 5 h, which were favourable for imaging measurement. With the advantages of the designed composite system, the present experiments propose a strategy for developing a new multiple imaging-drug delivery-local therapy platform for synergistic diagnosis and therapy.
研究领域:
材料科学
·
医学影像
·
肿瘤学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 32
·15405-15414
·
IF 3.553
Wang Yige,Gao Bo,Wang Qian,Li Xiaohui,Su Zhi,Chang Aimin
The aim of this paper is to present a novel negative temperature coefficient (NTC) thermistor based on A 2 Zr 2 O 7 (A = Nd, Sm, Gd, Yb) zirconate ceramics with pyrochlore-type structure for high-temperature application. The zirconate ceramics were synthesized via a solid-state reaction method where rare-earth oxides and ZrO 2 were used as starting materials. The physical structures were characterized by X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. It was confirmed that Nd 2 Zr 2 O 7 and Sm 2 Zr 2 O 7 are pyrochlore phases, while Yb 2 Zr 2 O 7 and Gd 2 Zr 2 O 7 are defect fluorite phases. The electrical property investigated by using resistance–temperature measurements demonstrated that the prepared A 2 Zr 2 O 7 zirconate ceramics exhibit a typical characteristic of NTC over a wide temperature range between 673 and 1273 K. Particularly, A 2 Zr 2 O 7 , in addition to having high activation energy to ensure better sensitivity, can still maintain higher resistivity under high-temperature environments. Furthermore, the resistivity of A 2 Zr 2 O 7 is almost independent of the change in oxygen partial pressure. These properties are superior to the classical spinel-type or perovskite-type NTC thermistor, providing valuable information to explore new NTC thermistor for high-temperature applications.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
INTERNATIONAL DAIRY JOURNAL
·
2022
·
IF 3.572
Xianglin Yue,Junru Sun,Ru Zhao,Jinsheng Zhang
Rapid screening and early warning of pathogenic bacteria in food is the key to prevent and control the spread of foodborne diseases . Biotin–streptavidin system and membrane filtration technology were combined to develop a novel nuclear magnetic resonance (NMR) immunosensor based on biomacromolecule O-carboxymethyl chitosan (O-CMCS) target gadolinium (Gd) probe for rapid detection of Salmonella anatum in milk. Under optimal experimental parameters, the proposed NMR immunosensor could detect Salmonella in milk with a limit of detection of 1.8 × 10 4 cfu mL −1 within 2 h. Furthermore, the immunosensor exhibited good specificity, sensitivity and reproducibility, which could achieve the direct determination of biological samples with complex composition. Hence, the developed assay might have great application potential for the rapid detection of Salmonella in food.
研究领域:
食品科学
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分析化学
·
微生物学
·
生物技术
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DOI
高影响因子
Small
·
2023
·
IF 13.3
Ya-Xiang Han,Chun-Li Hu,Jiang-Gao Mao
The first examples of thioborate-thiosilicates, namely Ca 2 Ln(BS 3 )(SiS 4 ) (Ln = La, Ce, and Gd), are synthesized by rationally designed high-temperature solid-state reactions. They crystalize in the polar space group P 6 3 mc and feature a novel three-dimensional crystal structure in which the discrete [BS 3 ] 3− and [SiS 4 ] 4− anionic groups are linked by Ca 2+ and Ln 3+ cations occupying the same atomic site. Remarkably, all three compounds show comprehensive properties required as promising infrared nonlinear optical materials, including phase-matchable strong second harmonic generation (SHG) responses at 2.05 µm (1.1–1.2 times that of AgGaS 2 ), high laser-induced damage thresholds (7–10 times that of AgGaS 2 ), wide light transmission range (0.45–11 µm), high thermal stabilities (>800 °C), and large calculated birefringence (0.126–0.149 @1064 nm), which justify the material design strategy of combining [BS 3 ] 3− and [SiS 4 ] 4− active units. Theoretical calculations suggest that their large SHG effects originate mainly from the synergy effects of the LnS 6 , BS 3 , and SiS 4 groups. This work not only broadens the scope of research on metal chalcogenides but also provides a new synthetic route for mixed anionic thioborates.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Zixuan Zhou,Yuhan Jiang,Xin Luo,Ying Zhang,Lei Wang,Yaguang Sun,Jingwei Liu,Mingchang Zhu,Jinchao Cao,Shuangyan Wu
Milk, owing to its nutritional value, is a staple commodity in daily life. Ensuring its integrity and authenticity is paramount for researchers and the food industry. To evaluate spoilage and adulteration of milk, we proposed a robust and reliable optical method to guarantee milk quality by utilizing riboflavin as an internal biomarker. By precisely controlling the content of Eu 3+ , Tb 3+ , and Gd 3+ ions, a two-dimensional ratiometric luminescence lanthanide coordination polymer (Ln-CP) with adjustable emission centers was synthesized for the detection of riboflavin (RF), leveraging a Förster resonance energy transfer (FRET) and photoinduced electron transfer (PET) process. This method demonstrates high sensitivity and selectivity towards RF and has been successfully applied to the detection of RF in both milk and calf serum.
研究领域:
分析化学
·
食品科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fangyuan Jing,Yuda Zhu,Fan Li,Yilan Wang,Xiuxian Yu,Kun Zhang,Guang Xin,Wen Huang
Acute pancreatitis (AP) is a life-threatening inflammatory disease of the pancreas. When AP occurs, macrophages are recruited and stimulated to pro-inflammatory M1 phenotype, releasing pro-inflammatory factors and reactive oxygen species (ROS). Therefore, macrophage polarization is one of the most promising therapeutic strategies for AP therapy. In this study, we designed a chitosan-based inflammation-responsive nanosystem, which successfully integrates ROS scavenging, macrophage polarization and multimodal imaging for AP treatment. Through a convenient hydrothermal method, Ce and Gd bimetallic ions doped CDs (Ce/Gd-CDs) were successfully constructed, which showed excellent ROS scavenging and magnetic resonance imaging (MRI) function. Then, chitosan was employed as an inflammation-responsive carrier for loading with both Ce/Gd-CDs and resveratrol (RES), forming multifunctional therapeutic agent CDs/ [email protected] NPs (CRCS). The pH-sensitive chitosan carriers were able to reduce the biotoxicity of Ce/Gd-CDs and RES and prolong their in vivo circulation time, thus advancing their utilization. Taken together, the in vitro and in vivo studies of CRCS displayed a favorable synergistic potency of ROS scavenging, macrophage polarization and multimodal imaging, significantly reducing AP. Our design expands the biological application of multifunctional nano-enzymes while providing a novel strategy toward constructing microenvironment-responsive therapeutic platforms for inflammatory disease treatment.
研究领域:
纳米技术
·
生物医学工程
·
药学
·
成像科学
·
炎症生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenyu Xu,Han Liu,Weiping Zhou,Wanchun Yu,Guoqiang Xiao,Di Lu,Fei Gao,Zhenzhi Cheng,Guangsheng Luo
In this study, the impact of Gd 3+ doping on the structural, magnetic and dielectric properties of BaSrCo 2 (Fe 1- x Gd x ) 11 AlO 22 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) ferrite ceramics synthesized by the conventional solid-state reaction method are investigated. XRD results reveal that all the samples crystallize in the R 3 ‾ m space group. With the increase of Gd content, the formation of M-type phase is effectively inhibited due to Gd 3+ ions may change the activation energy of nucleation of the grains and the formation energy of hexaferrite. SEM analysis confirms the presence of hexagonal grains in samples with homogeneous elements distribution. The XPS results verify the coexistence of ferric and ferrous ions in the ceramics. The magnetization and coercivity are suppressed by Gd 3+ substitution. The permeability increases firstly and then decreases with the substitution of Gd ions. While the dielectric constant increases with the substitution of Gd. The real and imaginary parts of the dielectric constant in the frequency range of 2–18 GHz change slightly with doping amounts variation, and all the samples exhibit prominent peaks at about 14 GHz due to natural resonance.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2017
·Vol. 13
·期 3
·243-254
·
IF 4.521
Jiang Dandan,Zhang Xiaopeng,Yu Dexin,Xiao Yanan,Wang Tianqi,Su Zhihui,Liu Yongjun,Zhang Na
Magnetic resonance imaging (MRI) contrast agents with tumor-microenvironment changeable relaxivity are effective to increase the sensitivity and selectivity of MRI in tumor diagnosis. In this study, pH-sensitive Gd-loaded Poly(L-lysine)/ Carboxymethyl Chitosan Nanoparticles (Gd-PCNPs)
were developed as relaxivity-changeable MRI contrast agents based on the "on–off" switchable strategy. The "on–off" switchable nano-contrast agents were capable of releasing Gd3+ in response to physical stimulation, with structure transformed. Gd-PCNPs could responsively
disassemble in an acidic tumor-microenvironment and increase the exchange of protons between water molecules and Gd3+ ions, thus selectively enhance the relaxivity in tumor area. Gd-PCNPs were self-assembled via electrostatic interaction between poly(L-lysine)-diethylenetriamine
pentaacetic acid-gadolinium and pH-sensitive carboxymethyl chitosan (CMCS). Gd-PCNPs exhibited spherical shape with uniform particle size distribution (166.00 ± 1 .71 nm) and negative zeta potential (–13.2 ± 4.7 mV). The relaxivity of Gd-PCNPs increased from 6.618 mM–1
· s–1 to 10.008 mM–1 · s–1 when the pH values decrease from 7.4 to 6.0, which was higher than Magnevist® (3.924 mM–1 · s–1 at both pH 7.4 and 6.0 (p <0 05). The
changeable relaxivity of Gd/PCNPs would result in enhanced tumor/normal tissue signal contrast, which was verified by in vivo MRI test. In vivo MRI test showed that the signal of Gd-PCNPs was significantly enhanced with prolonged imaging time in tumor tissue compared to Magnevist®
(p <0 05). Furthermore, Gd-PCNPs exhibited unobvious in vitro cytotoxicity under the experimental concentrations in B16 cells. No obvious damage was observed in the different tissues of mice. These results indicated that the relaxivity-changeable Gd-PCNPs exhibited demonstrated
sensitivity and selectivity in tumor diagnosis with a great potential as a novel MRI contrast agent.
研究领域:
医学影像
·
纳米技术
·
癌症研究
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Guomeng Li,Xudong Zheng,Xi Zhang,Youming Zhu,Lin Guo,Jinfeng Mei,Xiukun Ge,Zhongyu Li
The development of high technology has elevated industry’s dependence on rare earth resources. The hydrometallurgical process is widely used for the separation of rare earth elements (REEs) from rare earth ores, producing acidic leachate with trace amounts of REEs. Recovery of REEs from rare earth leachate not only mitigates the negative impact of leachate on the environment, but also contributes to the realization of sustainable resource utilization. In this study, two novel imprinted cryogel adsorbents, methyltrioctylammonium chloride-derivative carboxymethylated cellulose nanocrystal imprinted cryogel (LR-ICMC) and ethylmethylimidazolium bromide-derivative carboxymethylated cellulose nanocrystal imprinted cryogel (LM-ICMC), were constructed by using carboxymethylated modified cellulose nanocrystals as a backbone structure, and successfully branched ionic liquids (ILs) methyltrioctylammonium chloride-derivative and ethylmethylimidazolium bromide-derivative, respectively, for the separation of gadolinium ions (Gd(III)) from rare earth leachate. Firstly, SEM and TEM results showed that the incorporation of ILs retained part of the pore structure of carboxymethylated cellulose nanocrystals (CMCNCs). BET and TG results illustrated that the incorporation of ILs effectively increased the specific surface area and thermal stability of LR-ICMC and LM-ICMC. FT-IR and XPS results showed that LR-ICMC and LM-ICMC could adsorb Gd(III) by electrostatic and chelating effects. Secondly, adsorption isotherm experiments demonstrated the adsorption capacities of 66.880 mg/g and 75.895 mg/g for LR-ICMC and LM-ICMC, respectively; adsorption kinetic experiments demonstrated the ability of LR-ICMC and LM-ICMC to rapidly adsorb 85.152 % and 87.989 % of the maximum adsorption capacity, respectively, within the initial first 40 min. Finally, cycling experiments demonstrated the advantages of LR-ICMC and LM-ICMC in reuse, maintaining 89.245 % and 90.734 % of the original performance after five adsorption–desorption cycles, respectively. Based on these results, LR-ICMC and LM-ICMC were demonstrated to be highly efficient and reusable adsorbents for selective recovery of Gd(III) from rare earth leachate. This study deepens the application of ILs in solid-phase adsorbents and highlights the great potential of LR-ICMC and LM-ICMC in the field of REEs recovery.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
ACS Omega
·
2026
·
IF 5.2
Xuan Liu,Liangliang Chang,Aiguo He,Zengzhe Xi,Chunsheng Zhou,Baoyue Cao
The persistence of fluoroquinolone antibiotics like OFL in aquatic environments poses a significant ecological and public health risk due to their poor biodegradability and potential to induce antibiotic resistance. This study reports the fabrication of free-standing, flexible nanofibrous films via electrospinning, incorporating optimal BGFZ9 nanoparticles into a P(VDF-HFP) matrix (denoted as P(VDF-HFP)@BGFZ9). Comprehensive characterization reveals that the BGFZ9 nanoparticles act as effective heterogeneous nucleating agents, significantly promoting the formation of piezoelectric β-phase in P(VDF-HFP) and enhancing the ferroelectric polarization of the composite through interfacial coupling. Under ultrasonic excitation, the composite film exhibits remarkable piezocatalytic performance for OFL degradation, following pseudo-first-order kinetics. The film with an optimal 10% BGFZ9 loading achieves a reaction rate constant of 0.684 min–1·g–1 under piezocatalysis, which is approximately 1.22 times higher than that of the pure polymer film. A synergistic piezophotocatalytic effect is observed under combined ultrasonic and light irradiation, leading to an OFL removal efficiency of 85.71% within 3 h and a further increased rate constant of 1.043 min–1·g–1. Radical scavenger experiments and EPR spectroscopy identify superoxide radicals •O2– and h+ as the primary reactive species responsible for the degradation. The composite film demonstrates excellent cycling stability, retaining 94.4% of its initial activity after five consecutive runs, alongside robust structural integrity. This work provides a novel strategy for developing efficient, stable, and easily recyclable flexible piezocatalytic materials for antibiotic wastewater remediation.
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DOI
PubMed
高影响因子
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