CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhiyuan Zhang,Jinwu Chen,Ying Tang,Huaicheng Xiang,Jie Li,Liang Fang,Junqi Chen
Two novel low- ε r CaRECeV 3 O 12 (RE = Nd, Sm) microwave dielectric ceramics were prepared to utilize the solid-state method. According to XRD and Raman spectroscopy data, the CaRECeV 3 O 12 (RE = Nd, Sm) ceramics had a tetragonal zircon-type with an I 4 1 / amd space group. Dense CaNdCeV 3 O 12 and CaSmCeV 3 O 12 ceramics sintered at 1225 °C and 1200 °C showed ε r ∼11.85 ± 0.1 and 11.33 ± 0.1, Q × f ∼40,100 ± 500 GHz and 43,290 ± 500 GHz, τ f ∼ −27.2 ± 0.5 ppm/°C and −22.4 ± 0.5 ppm/°C, along with α L of 9.4 ppm/°C and 8.5 ppm/°C, respectively. The measured ε r and corrected ε r (corr) values were larger than ε r (C-M) (9.41 and 9.47) in CaNdCeV 3 O 12 and CaSmCeV 3 O 12 due to the cations being, on average, under-bonded and the overall structures being in a slightly expanded state. The slightly higher | < d > | value of CaNdCeV 3 O 12 led to its higher ε r (corr) value, even though it had a lower α D /V m value. The sign and magnitude of τ f values for CaNdCeV 3 O 12 and CaSmCeV 3 O 12 were mainly determined by their positive temperature coefficients of dielectric polarizability τ αm of +36.2 ppm/°C and +32.1 ppm/°C, respectively. The inherent dielectric constant and dielectric loss were examined using far-infrared reflectivity spectra, Raman spectra, and the packing fraction.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Water
·
2020
·Vol. 12
·期 5
·1317
·
IF 2.544
Yan Zhang,Zhili Ni,Jie Yao
The electrochemical oxidation processes have attracted tremendous attention on the destruction of toxic and non-biodegradable organics. A series of neodymium (Nd)-doped PbO2electrodes (Ti/PbO2-Nd) were synthesized through a pulse electrodeposition method, and its activity of bisphenol S (BPS) removal was further examined. The morphologies and structures were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and an energy dispersive spectrometer (EDS). The performance, energy consumption and mechanism of electrochemical oxidation of BPS by Ti/PbO2-Nd electrode were also discussed. Compared to the traditional Ti/PbO2electrode, the Ti/PbO2-Nd enables finer crystal particles, facilitating the oxygen evolution overpotential (OEP) from 1.41V to 1.55V and the generation of hydroxyl radicals (•OH). Moreover, lower duty cycles during the preparation of the electrode also contribute to the tapering size of crystals. The results show that the Ti/PbO2-Nd electrode exhibits relatively high activity in the anodic oxidation of BPS. Over 95% of BPS could be removed with the current density of 15 mA cm−2. Moreover, the energy consumption of BPS degradation on Ti/PbO2-Nd electrode is 60.26 kWh m−3, much lower than that on Ti/PbO2electrode (95.45 kWh m−3). To conclude, the Ti/PbO2-Nd electrode has been proven to be a promising material for BPS removal.Keywords:bisphenol S;electrochemical degradation;Ti/PbO2-Nd electrode;mechanism;duty cycle
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 9
·1-12
·
IF 2.325
Shuai Cijun,Yang Youwen,Peng Shuping,Gao Chengde,Feng Pei,Chen Jian,Liu Yong,Lin Xin,Yang Sheng,Yuan Fulai
Mg-5.6Zn-0.5Zr alloy (ZK60) tends to degrade too rapid for orthopedic application, in spite of its natural degradation, suitable strength and good biocompatibility. In this study, Nd was alloyed with ZK60 via laser melting method to enhance its corrosion resistance. The microstructure features, mechanical properties and corrosion behaviors of ZK60- x Nd ( x = 0, 1.8, 3.6, 5.4 wt.%) were investigated. Results showed that laser melted ZK60- x Nd were composed of fine ɑ-Mg grains and intermetallic phases along grain boundaries. And the precipitated intermetallic phases experienced successive changes: divorced island-like MgZn phase → honeycomb-like T phase → coarsened and agglomerated W phase with Nd increasing. It was worth noting that ZK60-3.6Nd with honeycomb-like T phase exhibited an optimal corrosion behavior with a corrosion rate of 1.56 mm year −1 . The improved corrosion behavior was ascribed to: (I) dense surface film caused by the formation of Nd 2 O 3 hindered the invasion of immersion solution; (II) the three-dimensional honeycomb structure of intermetallic phases formed a tight barrier to restrain the propagation of corrosion. Moreover, ZK60-3.6Nd exhibited good biocompatibility. It was suggested that ZK60-3.6Nd was a preferable candidate for biodegradable bone implant.
研究领域:
材料科学
·
生物医学工程
·
腐蚀科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Huajing Wang,Rui Xiong,Zhou Cui,Jie Wan,Baisheng Sa,Xiao Wu,Wulin Song,Xiaoxia Wang,Dawen Zeng
The problems of lithium-ion battery (LIB) failure have attracted growing attention since flammable and explosive electrolyte leakage might lead to serious consequences. However, due to the redox-neutral and volatile nature of main electrolyte components, such as dimethyl carbonate (DMC), trace leakages are difficult to detect. Therefore, research on LIB electrolyte sensors is urgent and lacking. Herein, sensors based on rare-earth Nd-doped SnO2 nanofibers are reported for detecting DMC vapor in LIB. The excellent sensitivity (distinct response to 20 ppb DMC), high response (∼38.13–50 ppm DMC), and superior selectivity and stability of 3%Nd-SnO2 suggest that it should be a promising candidate for LIB safety monitors. Meanwhile, it also shows clear and rapid response during the LIB-leakage real-time detection experiment. The doping of Nd endows SnO2 with more oxygen vacancy defects. In addition, the highly active Nd sites greatly enhanced the adsorption energy of DMC on SnO2. All of these features contribute to the improvement of DMC-sensing performances.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
Science Advances
·
2020
·Vol. 6
·期 32
·
IF 13.117
Lingling Ma,Yanling Zhou,Zhaowenbin Zhang,Yaqin Liu,Dong Zhai,Hui Zhuang,Qin Li,Jianding Yuye,Chengtie Wu,Jiang Chang
Photothermal therapy (PTT), an emerging tumor treatment technology, has attracted tremendous interest, but excessive heat will cause damage to surrounding healthy tissues. Therefore, in situ temperature monitoring during PTT is of great importance to determine optimal treatment temperature and repair heat-damaged normal tissues. Here, we report the preparation of multifunctional Nd-Ca-Si silicate glasses and glass/alginate composite hydrogels that not only have photothermal property but also emit fluorescence under 808-nm laser irradiation, and its fluorescence intensity is linearly correlated with in situ temperature. With this feature, optimal PTT temperature for effective tumor treatment with minimal normal tissue damage can be obtained. In addition, because of the bioactive silicate components, the composite hydrogel has bioactivity to repair heat damage caused by PTT. This implantable multifunctional material with unique temperature monitoring, photothermal function, and wound healing bioactivity can be used for localized thermal therapy.
研究领域:
材料科学
·
生物医学工程
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CURRENT APPLIED PHYSICS
·
2022
·
IF 2.856
Xiyue He,Bijun Fang,Shuai Zhang,Xiaolong Lu,Jianning Ding
0.5 mol% Nd-doped (Ba 0.85 Ca 0.15 )(Ti 0.9 Hf 0.1 )O 3 (BCTH-Nd) lead-free ceramics were prepared by a solid-phase twin crystal method, where the effects of sintering condition on structure, electrical and optical properties were studied. All the sintered BCTH-Nd ceramics exhibit pure perovskite structure, dense microstructure with several micron grain size , which tends to increase with elevating sintering temperature. All synthesized ceramics have complex dielectric behavior, which presents normal ferroelectrics characteristic with slight dispersion phenomenon. The BCTH-Nd ceramics exhibit excellent piezoelectric and ferroelectric properties and acceptable dielectric performance when sintered at 1480 °C for 2 h. Under 269 nm light excitation, several fluorescent emission peaks are excited with a whole indigo fluorescence, where the strongest emission peak is emitted at 473 nm, corresponding to the 4 G 3/2 → 4 I 9/2 energy level transition of Nd 3+ . Multifunctional performance is fulfilled in the lead-free BCTH ceramics via rare earth doping, which can broaden the application fields of piezoelectric-based materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 4
·1759-1767
·
IF 1.754
Liu Yaoyang,Liu Zhibin,Zhao Chuang,Jiao Caishan,Zhang Meng,Zhou Yu,Gao Yang,Li Huibo,He Hui
In order to further study the structure-performance relationship of unsymmetrical diglycolamides. In this work, two types of unsymmetrical diglycolamides (Structure A : N,N’ -dimethyl- N,N’ -didecyl diglycoamide, L I , N,N’ -dimethyl- N,N’ -didodecyl diglycoamide, L III ; Structure B : N,N -dimethyl- N’,N’ -didecyl diglycoamide, L II , N,N -dimethyl- N’,N’ -didodecyl diglycoamide, L IV ), which are geometrical isomers each other, were synthesized, and their extraction performances in 40/60 (v/v)% n-octanol/kerosene were studied and compared. The related results reveal that the size of the alkyl substituents attached on the amide N atoms can influence the extractant performance of the extractant, and the difference in the geometric structure of extractants can lead to the differences in their extraction performances.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 4
·5498-5504
·
IF 2.605
Shizhou Pu,He Zheng,Zhenlian Chen,Meiya Li,Zhongqiang Hu,Jianbo Wang,Huamin Zou
The microstructures of Bi 0.85 Nd 0.15 FeO 3 ceramics were investigated by using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), convergent-beam electron diffraction (CBED) and X-ray energy dispersive spectrometry (EDS). The superstructure phase related to 1/4( hh 0) p and 1/4(00 l ) p diffraction spots were observed in the samples. It is found that the superstructure phase can co-exist with R 3 c phase in a single grain. The bright and dark field images accompanied with SAED patterns provided evidences of the superstructure phase dispersed into the matrix with R3c symmetry and evolution of the domain. The ferroelectric domain wall was observed according to the displacement of Fe 3+ ions respect to Bi 3+ sub-lattice in the ferroelectric R 3 c phase based on HRTEM observations. The space group Pnam of the superstructure was identified by combining SAED and CBED techniques . EDS measurement revealed that the concentration of Nd in the Pnam phase is higher than that in R 3 c phase. This might mean that the transition from R 3 c to Pnam structure is due to the inhomogeneous distribution of the Nd concentration and the weakened stereochemical activity of Bi 3+ lone electron pair, arisen from the increase in Nd content.
研究领域:
材料科学
·
凝聚态物理
·
功能陶瓷
·
电子显微学
·
铁电材料
·
多铁材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Yi Ding,Xirui Lu,Hui Dan,Xiaoyan Shu,Shuai Zhang,Tao Duan
Zr 1− x Nd x SiO 4− x /2 (0≤ x ≤0.1) ceramics were prepared by solid-state reaction method. The effects of Nd content on the phase structure of the ceramics were investigated. The chemical durability of Nd-doped zircon ceramic waste forms was also examined. The results show that the ceramics with x <0.04 show homogeneous single zircon phase, while the samples with x ≥0.04 e x hibit coexistence of two crystal phases (zircon and Nd 2 Si 2 O 7 ). The bulk density of the Nd-doped zircon ceramics increases with the increase in neodymium content. Moreover, the normalized element release rates of Nd element in Nd-doped zircon ceramics firstly decrease with leaching time and almost no change after 14 days (~10 −4 g m −2 d −1 ), demonstrating its good chemical durability. These results indicate that the obtained zircon ceramics waste forms are promising candidate for immobilization of trivalent actinides.
研究领域:
材料科学
·
核废物管理
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Qinghu Guo,Xiangyu Meng,Dongxu Li,Zhonghua Yao,Huajun Sun,Hua Hao,Hanxing Liu,Shujun Zhang
Electrostrictive materials play an important role in the development of high precision actuators, due to the advantages of high resolution, low power dissipation and fast response time. However, the practical application of electrostrictive materials has been hindered by their limited displacement output. To address this, we conducted a study where we doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics with Nd 2 O 3 , aiming to significantly improve the electrostrictive effect by enhancing local structural heterogeneities that disrupt the formation of long-range ordered ferroelectric domains. We obtained an optimized electrostrictive strain of 0.231 % with negligible hysteresis at an electric field of 50 kV/cm in 4 %Nd-doped PMN-PT ceramic, surpassing the performance of state-of-the-art lead-based electrostrictive ceramics. Of particular significance is that a high electrostrictive coefficients M 33 = 12.2 × 10 −16 m 2 /V 2 , together with a high mechanical work density of 0.035 J/cm 3 and a low power dissipation of 14 %, was achieved under a mechanical prestress of 50 MPa and an electric field of 10 kV/cm. Additionally, this material exhibits excellent fatigue resistance , with less than 3 % variation over 10 6 operation cycles. All these findings position 4 %Nd-doped PMN-PT ceramics as a promising candidate for high-performance electromechanical actuator applications.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Congcong Wang,Yu Meng,Zewen Su,Junqiang Dong,Yanbang Lian,Youqiang Huang,Yinyan Li,Shiqing Xu,Gongxun Bai
The acquisition of real-time temperature monitoring during photothermal therapy is significant to prevent unnecessary damage to healthy tissues. However, owing to complexity and diverse factors in microenvironment of cells, there still remain considerable challenges in achieving noninvasive temperature measurement and manipulation in therapeutic process. Herein, biocompatible Nd-doped MoSe 2 nanosheets have been developed on the premise of excellent photothermal effect, which manifest desirable photoluminescence and distinct temperature self-monitored capability in near-infrared I and II bio-windows. Based on thermally coupled energy levels of Nd ions, the real-time monitoring on temperature changes in intracellular environment can be realized which provide instant temperature feedbacks to avoid side effects from hyperthermia. Exclusive of detrimental elements such as F and Pb, the objective nanosheets manifest satisfactory biosafety and can induce effective tumor ablation under near-infrared irradiation with photothermal conversion efficiency up to 40.8%, providing an innovative vision for developing more precisely and safely photothermal approaches.
研究领域:
生物医学工程
·
材料科学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·1459-1471
·
IF 3.784
Shengtai Zhang,Baoliang Xu,Jingkai Cheng,Shilin Luo,Yi Ding,Shiyin Ji,Tao Duan,Jianjun Ma,Cairong Jiang
Molten salt provides a fast mass transfer and nucleation process, so the ceramic solid solution for immobilization of high-level nuclear waste (HLW) can be synthesized at lower temperatures. The chemical stability in the process of interaction with groundwater determines the ability of the matrix phase to prevent radionuclides from entering the biosphere. Nd-doped Y 3 Fe 5 O 12 ceramics were prepared by the molten salt method at different sintering temperatures (1000℃, 1100℃, 1200℃) and different m (eutectic salt): m (oxide) ratios (2:1, 3:1, 4:1). The sintered ceramic is Y 3-x Nd x Fe 5 O 12 , where x is the solubility of Nd in YIG. The results show that the optimum mass ratio of molten salt to oxide is 3:1. The solubility of Nd in garnet is 33.3 mol% ( x = 1.1) and 56.7 mol% ( x = 1.6) at 1100℃ and 1200℃, respectively. In the neutral medium, Nd does not transfer to the liquid phase. Acid leaching promotes the strong dissolution of the garnet matrix. In this case, the leaching rate of Nd from ceramics to the liquid phase is two to three orders of magnitude higher than that in a neutral medium. The experimental results suggest that garnet matrices can reliably immobilize actinides in subsurface repositories.
研究领域:
材料科学
·
核废料管理
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）