APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Chang Su,Changbai Liu,Li Liu,Mucui Ni,Haiying Li,Xiaoqing Bo,Lili Liu,Xiao Chi
Pure and 3 wt% Sm-doped α-Fe 2 O 3 nanotubes are prepared via a typical electrospinning technology and calcination procedure. The characteristic and morphology of the synthesized nanotubes are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). Compared with pure α-Fe 2 O 3 nanotubes, 3 wt% Sm-doped α-Fe 2 O 3 nanotubes display enhanced gas-sensing properties. The response of 3 wt% Sm-doped α-Fe 2 O 3 nanotubes is 33–50 ppm acetone, which is 13 times larger than that of pure α-Fe 2 O 3 nanotubes. The lowest detection limit of acetone is 500 ppb to which the response is 2.3 at the optimum operating temperature of 240 °C. The response and recovery times are about 6 and 11 s to 50 ppm acetone, respectively. In addition, 3 wt% Sm-doped α-Fe 2 O 3 nanotubes exhibit good selectivity and long term stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2015
·
IF 0.677
Renping Cao,Zhengdong Qin,Xiaoguang Yu,Donglan Wu,Guotai Zheng,Wensheng Li
BaSO 4 phosphor activated with Sm are prepared by the high temperature solid state reaction method in air, and its crystal structure, morphology, and luminescence properties are investigated. Broadband PLE spectrum are observed within the range 250–580 nm owing to mainly the 4f–5d transitions of Sm 2+ ions, and PL spectrum consists seven emission bands in the range of 550–780 nm owing to mainly 5 D 0 → 7 F J ( J = 0, 1, 2, and 3) transitions of Sm 2+ ion and 4 G 5/2 → 6 H J ( J = 5/2, 7/2, and 9/2) transitions of Sm 3+ ions. Sm 2+ ions can exist steadily in BaSO 4 :Sm phosphor sintered at different temperature and time in air. The optimum Sm 2+/3+ doping concentration, sintering temperature and time are about 2 mol%, 800 °C and 30 min, respectively. The luminous mechanisms are discussed by the schematic energy level diagrams of Sm 3+ and Sm 2+ ions.
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 ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·E616
·
IF 3.662
Junfeng Li,Mingyong Wang,Jiguo Tu,Shuqiang Jiao
The direct preparation of metallic Sm or alloys from raw oxide Sm2O3 is an attracting but challenging process. The stable electrochemical behavior and low solubility of Sm2O3 limit the extraction of Sm element in molten salts. Here, it is found that metallic Sm is hardly obtained by electro-deoxidation and aluminothermic reduction of solid Sm2O3 pellet according to experiment and calculation. Through the novel electrochemical reduction of solid Sm2O3-Al pellet, Al3Sm alloy with ∼0.4 Sm/Al molar ratio is successfully prepared in calcium chloride melt at 1173 K. The reduction potential of Sm2O3-Al pellet to Al-Sm alloy is more positive than that of calcium. Al plays an indispensable role in the reduction of Sm2O3. The preparation process of alloy can be well identified as two steps: Sm(III) → Sm(II) and Sm(II) → Sm(0). Sm2O3 is firstly converted to Sm(II) based on the combination of electrochemical and aluminothermic reduction. Then, Al3Sm is formed by electrochemical reduction and alloying with Al.
研究领域:
材料科学
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电化学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Chaoyang Zhang,Conghao Gao,Shumin Yang,Xin He,Yue Chen,Xiao Qin,Yulin Tang
Chloramphenicol (CAP) is used extensively in industry and daily life, but its abuse has seriously affected the environment and public health. In this paper, a new composite PbO 2 electrode was obtained through the modification Sm and polyethylene glycol (PEG), and an electrocatalytic oxidation technology of CAP degradation was investigated. The results showed that the catalytic degradation ability and industrial service life of the PEG-Sm-PbO 2 composite electrode were significantly enhanced. Co-doping inhibited the growth of grains, resulting in the formation of refined pyramidal grains on the surface of the electrode, which increased the number of active spots. The industrial service life of the modified electrode was improved by 87.0%. In addition, the degradation effect under different conditions and mechanism of CAP were also explored. The optimal conditions for CAP degradation were explored, at which time the CAP degradation rate reached 99.1%. The degradation process was in accordance with the primary reaction kinetics, and the apparent rate constant of CAP at the PEG-Sm-PbO 2 electrode was raised by 57.1% in comparison with the unmodified electrode, indicating that the modification facilitated the degradation of CAP in the electrode. Finally, two possible CAP degradation pathways were deduced. The results will provide technical support and a theoretical basis for the degradation of persistent organic pollutants.
研究领域:
环境科学
·
电化学工程
·
污染控制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Kongyou Wu,Kungang Chai,Liqin Zhou,Zhiliang Duan,Haibo Wu,Zhenghui Huang,Dongli Li,Zhongwei Tan,Fang Shen,Zongwu Wei,Hongbing Ji
Herein, a TEMPO-oxidized cellulose-grafted-polystyrene hypercrosslinked polymer (TOC-PS-HCP) was synthesized facilely by TEMPO oxidation , grafting copolymerization and post crosslinking route. Based on the structural characterization, it was confirmed that TOC-PS-HCP mainly consisted of polystyrene chain on cellulose and rigid crosslinked bridge. Additionally, the as-prepared TOC-PS-HCP displayed appropriate hydrophobicity (water contact angle = 102.44°) and high specific surface area (S BET = 601.20 m 2 ·g ‐ −1 ), which could efficiently recover ethylbenzene and styrene from PO/SM wastewater. The adsorption experiment was conducted to study the recovery performance for ethylbenzene and styrene in the aqueous phase. The results showed that TOC-PS-HCP could recover ethylbenzene and styrene quickly by adsorption process, and maintain a stable recovery rate both in different aqueous conditions and recycle experiments. The adsorption experiment in the simulated wastewater solution showed that TOC-PS-HCP exhibited the greater affinity for ethylbenzene and styrene than other substrates. Furthermore, a possible mechanism for the efficient recovery of ethylbenzene and styrene was suggested on the basis of experimental and theoretical results, which may be associated with van der Waals force and π-π stacking.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Pei Fu,Zhuye Li,Yong Pan,Wenbin Zeng,Chen Zhu,Baoming Xu,Chi Chen
A b s t r a c t Pristine Li 2 ZnTi 3 O 8 and Li 2 ZnTi 2.97 Sm 0.03 O 8 are prepared by a conventional solid-state reaction method and the XRD , SEM, HRTEM and EDS measurements are employed to investigate the effects of Sm 3+ modifying on the characteristics of Li 2 ZnTi 3 O 8 . The results show that the introduction of a small amount of Sm 3+ does not change the bulk structure of Li 2 ZnTi 3 O 8 but effectively improves its electrochemical performance . After undergoing 500 cycles at 1 A g −1 , a retained specific capacity of 162.7 mAh g −1 is delivered by Li 2 ZnTi 2.97 Sm 0.03 O 8 , which is much higher than 118.1 mAh g −1 of pristine Li 2 ZnTi 3 O 8 . The significantly improved electrochemical performance of Li 2 ZnTi 2.97 Sm 0.03 O 8 can be attributed to the influence of Sm 3+ on the crystal lattice and surface of Li 2 ZnTi 3 O 8 .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8540-8547
·
IF 3.119
Guohai Yang,Daqing Zhang,Gen Zhu,Tingrong Zhou,Manting Song,Lulu Qu,Kecai Xiong,Haitao Li
The instability of graphene oxide (GO) membranes in aqueous solutions restricts their application in wastewater treatment through the membrane separation technology. In this work, a nanocomposite membrane (Sm-MOF/GO) composed of samarium metal–organic frameworks (Sm-MOFs) and GO nanosheets was successfully fabricated via the filtration of the corresponding Sm-MOF/GO dispersions. The in situ growth of Sm-MOF with aqueous stability on the GO sheets prevented the adjacent GO layers from expanding in aqueous solutions, thus endowing the prepared Sm-MOF/GO membrane with a stable membrane skeleton structure. Besides, the successful loading of Sm-MOF enlarged the layer space of the composite membrane, which was beneficial for higher permeance. The optimization of the Sm-MOF loading contents was also investigated to prepare M-X (where X represents the mass ratio of the MOF raw material to the total mass of the reactants). Subsequently, the fabricated M-0.31 possessed a high permeance of 26 L m−2 h−1 bar−1, which was 3 times higher than that of a pure GO membrane; moreover, high rejections (>91%) to rhodamine B and methylene blue were obtained. After continuous 5.5 h filtration, the excellent rejection was still maintained as expected, indicating the long-term stability of M-0.31.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 9
·9870-9876
·
IF 1.798
Liu Changbai,Wang Xuesong,Xie Feng,Liu Li,Ruan Shengping
Pure and Sm-doped In 2 O 3 porous nanotubes have been successfully fabricated by the single-capillary electrospinning method followed by calcination. The as-synthesized porous nanotubes were investigated by X-ray powder diffraction (XRD), energy-dispersive X-ray (EDX), scanning electron microscope (SEM), Raman spectra and X-ray photoelectron spectroscopy (XPS). It can be seen in SEM images that the surface of nanotubes is distributed with numerous pores. Gas sensing investigation reveals that Sm-doped In 2 O 3 porous nanotubes possess high-performance formaldehyde sensing properties. The response of gas sensors based on Sm-doped In 2 O 3 porous nanotubes was 54.37 towards 100 ppm formaldehyde at 240 °C, which was 5 times larger than that of pure In 2 O 3 porous nanotubes (10.87). The response and recovery times to 100 ppm formaldehyde were 9 and 40 s, respectively. Moreover, even at low concentration of 100 ppb formaldehyde, a detectable response of 2.1 can be observed. Furthermore, Sm-doped In 2 O 3 porous nanotube gas sensors have excellent selectivity to formaldehyde.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jianjun Zeng,Kuibao Zhang,Yuancheng Teng,Baozhu Luo
The concept of non-stoichiometric design, as a historically significant strategy in material design, plays a crucial role in the development and innovation of materials. Particularly in the domain of red-orange fluorescence, the importance of the rare earth Sm element has been increasingly emphasized. This study successfully prepared non-stoichiometric Gd2Zr2O7 transparent ceramics doped with Sm using combustion and vacuum sintering. X-ray diffraction analysis indicates that the obtained powders are composed of fine defect fluorite structure grains, while the final ceramics exhibit pyrochlore/defect fluorite phase. Initially, non-stoichiometric design optimizes the optical transmittance of ceramics. The maximum transmittance of the X = −0.1 ceramic exhibits the highest transmittance 82.4 % @ 1134 nm. Furthermore, photoelectrons captured by native defects energy levels can transfer to the Sm excited states, optimizing the fluorescence property of ceramics. The fluorescence intensity of the X = 0.8 ceramic is about five times that of the X = 0 ceramic.
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
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
Nano Energy
·
2024
·
IF 16.8
Wen Gao,Xiatian Wang,Jiaming Zhang,Xue Tian,Fengji Zheng,Pengkun Guo,Haoxing Xu,Rui Xin,Dashi Fu,Yang Qi,Yalin Qin,Kwok-Ho Lam,Xiaojing Gong,Zhihua Xie,Riqiang Lin,Yongcheng Zhang
As a promising new medical imaging method, photoacoustic imaging (PAI) has the advantages of optical resolution and acoustic depth of penetration. The transparent ultrasound transducer (TUT), as a novel device applied to PAI, can combine the laser and acoustic beam coaxially to improve the imaging quality. Transparent piezoelectric materials are the key to developing piezoelectric TUTs. However, due to the birefringence and light scattering caused by ferroelectric domains, it is very hard to prepare transparent piezoelectric materials with both high optical transmittance and excellent piezoelectricity. In this study, 2.5 mol% Sm-doped 0.72Pb(Mg 1/3 Nb 2/3) O 3 -0.28PbTiO 3 (PMN-PT) ceramic with a piezoelectric coefficient d 33 of 1460 pC N −1 and an optical transmission of 69 % at Near-Infrared (NIR) is successfully prepared, and its optical, microstructure, ferroelectric and dielectric properties are fully studied. Subsequently, a 3 mm-diameter photoacoustic coaxial probe is fabricated, involving a transparent ultrasound transducer based on the prepared ceramic. The TUT has a center frequency ( f c ) of 18.5 MHz, a −6 dB bandwidth of 20 %, and a high effective electromechanical factor ( k eff ) of 0.62. In addition, the imaging capability of the miniature probe is firstly confirmed through photoacoustic/ultrasound dual-modality imaging of in-vivo animals and phantoms, which indicates that the proposed transparent piezoelectric ceramic has great potential for PA/US imaging.
研究领域:
医学影像学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
C.X. Chen,X.Z. Zheng,W.B. Dai,C.Y. Ni,W.Y. Li,D. Wu
As energy consumption intensifies, energy saving and environmentally friendly phosphor-converted white light-emitting diodes (pc- w LEDs) have become the current research hotspots. The garnet-based CaY 2 Al 4 SiO 12 (CYAS) phosphors, with their abundant lattice sites and stable physical properties, are ideal candidates as phosphor hosts. Through comprehensive experimental and theoretical analyses, including XRD/Rietveld refinement and density functional theory (DFT) calculations, it was determined that Bi 3+ /Tb 3+ /Sm 3+ ions preferentially occupy the Y 3+ lattice site. The luminescence properties and thermal stability of CYAS: Bi 3+ /Tb 3+ /Sm 3+ have been extensively investigated. The quantum yield (QY) has been enhanced to 48.3 % due to energy transfer (ET), which is not a significant difference compared to existing phosphors, and by superposition of blue (Bi, 3 P 1 → 1 S 0 ), green (Tb, 5 D 4 → 7 F 5 ), and red (Sm, 4 G 5/2 → 6 H 5/2 ) emission, resulting in tunable spectrum and high-quality, full-spectrum white light emission. Finally, the w LED device with high color rendering index (CRI, 87), high luminous efficiency (LE, 74 lm·W −1 ), and low correlated color temperature (CCT, 4747.56 K) were fabricated by a remote ‘encapsulation’ packaging strategy, suggesting that the phosphor can be applied to high quality white light illumination.
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
危险品化学品经营许可证（带存储）