Materials Today Bio
·
2024
·
IF 8.7
Yunfei Liu,Chengji Shi,Piaoye Ming,Lingling Yuan,Xueyu Jiang,Min Jiang,Rui Cai,Xiaorong Lan,Jingang Xiao,Gang Tao
Bone defects caused by trauma, tumor resection, or developmental abnormalities are important issues in clinical practice. The vigorous development of tissue engineering technology provides new ideas and directions for regenerating bone defects. Hydroxyapatite (HAp), a bioactive ceramic, is extensively used in bone tissue engineering because of its excellent osteoinductive performance. However, its application is challenged by its single function and conventional environment-unfriendly synthesis methods. In this study, we successfully "green" synthesized sr-silk fibroin co-assembly hydroxyapatite nanoparticles (Sr-SF-HA) using silk fibroin (SF) as a biomineralized template, thus enabling it to have angiogenic activity and achieving the combination of organic and inorganic substances. Then, the rough composite microspheres loaded with Sr-SF-HA (CS/Sr-SF-HA) through electrostatic spraying technology and freeze-drying method were prepared. The CCK-8 test and live/dead cell staining showed excellent biocompatibility of CS/Sr-SF-HA. Alkaline phosphatase (ALP) staining, alizarin red staining (ARS), immunofluorescence, western blotting, and qRT-PCR test showed that CS/Sr-SF-HA activated the expression of related genes and proteins, thus inducing the osteogenic differentiation of rBMSCs. Moreover, tube formation experiments, scratch experiments, immunofluorescence, and qRT-PCR detection indicated that CS/Sr-SF-HA have good angiogenic activity. Furthermore, in vivo studies showed that the CS/Sr-SF-HA possesses excellent biocompatibility, vascular activity, as well as ectopic osteogenic ability in the subcutaneous pocket of rats. This study indicates that the construction of CS/Sr-SF-HA with angiogenic and osteogenic properties has great potential for bone tissue engineering.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 32
·期 1
·430-441
·
IF 2.22
Liu Yuping,Wu Peng,Kang Peng,Li Liuyang,Shi Jinchao,Zhou Zheng,Chen Guang-xin,Li Qifang
With the development of new mobile communication systems, the composite substrate used for the wideband antennas will show a suitable dielectric constant, low dielectric loss, and good dielectric stability in a wide frequency range. In this work, a kind of dielectric filler, Sr 2+ -doped CaCu 3 Ti 4 O 12 nanowires (Ca 1− x Sr x Cu 3 Ti 4 O 12 NWs, x SCCTO NWs), was synthesized via a two-step hydrothermal method for the first time. The composites were then prepared by adding the obtained filler to polydimethylsiloxane (PDMS). Results revealed that Sr 2+ doping can significantly reduce the dielectric loss of composites and stabilize both the dielectric constant and the dielectric loss in a wide frequency range compared with those of CCTO NWs–PDMS composites. Moreover, 0.4SCCTO NWs–PDMS composites exhibit high thermal stability, tensile strength, breakdown strength, and energy density. These properties effectively broaden the frequency range of the PDMS based composites, which are very suitable for the application in flexible wideband antenna substrate materials.
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Guangyao Yang,Bingjie Liu,Shiyuan Xie,Yongqing Xu,Jingbo Jia,Hui Zhou,Dongwu Chang,Changfu You,Haiming Wang,Junfu Lyu
Biomass chemical looping gasification (BCLG) demonstrates great potential to help address global environmental issues and green energy demands. Yet it remains a challenge to develop novel oxygen carriers (OCs) in BCLG to break the trade-off between the biomass conversion and syngas selectivity with high syngas yield. In this study, Sr–Fe OCs labelled as S3F2, S4F2, and S5F2, containing primarily of Ruddlesden–Popper (R-P) layered perovskite structured Sr 3 Fe 2 O 7-x , were synthesized. Sr 3 Fe 2 O 7-x thermodynamically favors the selective formation of CO over CO 2 , conferring its inherently high CO selectivity. Both the interstitial oxygen and lattice oxygen were found to contribute to the gasification process, which presented enhanced activity and oxygen uncoupling characteristic. The excessive Sr incorporation in S4F2 and S5F2 further increased the oxygen vacancies of Sr 3 Fe 2 O 7-x , and caused a much higher oxygen mobility and oxygen release capacity (S5F2 > S4F2 > S3F2). Additional Sr in S5F2 formed Sr(OH) 2 ·H 2 O on Sr 3 Fe 2 O 7-x surface, which acted as additional oxygen source for gasification and also suppressed the overoxidation of syngas product on the surface. These combined features enabled the most favorable performance of S5F2 with a carbon conversion of 91%, CO selectivity of 94%, and syngas yield of 1208 mL/g at 900 °C, much higher than the Fe 2 O 3 benchmark (77.8%, 59.8%, and 557.9 mL/g, respectively).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xiwei Liu,Jianke Sun,Kejin Qiu,Yinghong Yang,Zhongjie Pu,Li Li,Yufeng Zheng
Zn, a promising biodegradable material , possesses excellent biocompatibility and biodegradability, however its low strength and hardness largely limit its application in biodegradable implants. The addition of alloying elements would generally be suggested as an effective method for improving the mechanical properties. In the current study, alloying with a minor amount of Ca or Sr in Zn–1.5Mg alloy, the ternary alloys were composed of the matrix Zn and precipitated phase (Mg 2 Zn 11 and CaZn 13 for Zn–1.5Mg–0.1Ca alloy, Mg 2 Zn 11 and SrZn 13 for Zn–1.5Mg–0.1Sr alloy, respectively). Besides, the grain size of ternary alloys became more homogeneous and smaller than that of Zn–1.5Mg alloy. Meanwhile, the effect of alloying elements on the mechanical properties and corrosion behavior of Zn–1.5Mg alloy were analyzed. The results showed that the ternary alloys exhibited much higher yield strength (YS), ultimate tensile strength (UTS) and elongation than those of Zn–1.5Mg alloy. The measured corrosion rates of the ternary alloys were slightly increased due to galvanic corrosion reaction. Besides, a model of the corrosion mechanism in the simulated body fluid was discussed here based on the results of the studied alloys.
研究领域:
生物材料学
·
生物医学工程
·
金属腐蚀与防护
·
可降解植入材料
·
生物力学
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Longfei Song,Kunpeng Dou,Rongrong Wang,Ping Leng,Linqu Luo,Yan Xi,Chao-Cheng Kaun,Ning Han,Fengyun Wang,Yunfa Chen
In recent years, it is urgent and challenging to fabricate highly sensitive and selective gas sensors for breath analyses. In this work, Sr-doped cubic In2O3/rhombohedral In2O3 homojunction nanowires (NWs) are synthesized by one-step electrospun technology. The Sr doping alters the cubic phase of pure In2O3 into the rhombohedral phase, which is verified by the high-resolution transmittance electron microscopy, X-ray diffraction, and Raman spectroscopy, and is attributable to the low cohesive energy as calculated by the density functional theory (DFT). As a proof-of-concept of fatty liver biomarker sensing, ethanol sensors are fabricated using the electrospun In2O3 NWs. The results show that 8 wt % Sr-doped In2O3 shows the highest ethanol sensing performance with a high response of 21–1 ppm, a high selectivity over other interfering gases such as methanol, acetone, formaldehyde, toluene, xylene, and benzene, a high stability measured in 6 weeks, and also a high resistance to high humidity of 80%. The outstanding ethanol sensing performance is attributable to the enhanced ethanol adsorption by Sr doping as calculated by DFT, the stable rhombohedral phase and the preferred (104) facet exposure, and the formed homojunctions favoring the electron transfer. All these results show the effective structural modification of In2O3 by Sr doping, and also the great potency of the homojunction Sr-doped In2O3 NWs for highly sensitive, selective, and stable breath ethanol sensing.
研究领域:
材料科学
·
纳米技术
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气体传感
·
密度泛函理论（DFT）
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化学传感器
·
环境监测
·
生物医学诊断
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 15
·21264-21273
·
IF 5.164
Lijie Zhang,Yihang Li,Binze Zhang,Yanhong Wan,Zheqiang Xu,Shaowei Zhang,Tenglong Zhu,Changrong Xia
Summary As a promising technology to address the energy storage challenge, reversible solid oxide cell (RSOC) plays a vital role in conversion between chemical energy and electrical power. Over the last several decades, developing high performance fuel electrodes suitable for reversible operation have attracted extensive attentions. This work develops La 0.1 Sr 0.85 Ti 0.35 Fe 0.6 Ni 0.05 O 3− δ which is an A-site deficient design with B-site having additional 5% nickel as the fuel electrode through in-situ metal exsolution. The in-situ exsolution process results in FeNi 3 alloy particles, about 40 nm in size, while maintaining the perovskite structure of the parent oxide. The FeNi 3 nanoparticles greatly improve the electrochemical performance as RSOC fuel electrode such as reducing the interfacial polarization resistance at 800°C by 13.6%, increasing the peak power density by 19% in the fuel cell mode and increasing the current density by 30% in the electrolysis mode. Furthermore, RSOC operation is demonstrated by 20-cycle reverse tests that are conducted by switching between the fuel cell and electrolysis modes. The stable RSOC performance indicates that La 0.1 Sr 0.85 Ti 0.35 Fe 0.6 Ni 0.05 O 3− δ with in-situ constructed FeNi 3 nanoparticles is a potential fuel electrode material for RSOC.
研究领域:
材料科学
·
能源技术
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Materials
·
2025
·Vol. 18
·期 13
·2953
·
IF 3.2
Nanxi Lin,Hong Zhang,Yunye Shi,Chenjun Xu,Zhuoqian Xie,Yunjin Chen
The poor magnetic and magneto-optical properties of BiFeO3, along with its significant lattice mismatch with silicon, have limited its application in silicon-based integrated magneto-optical devices. In this study, co-doping with Sr2+and Ti4+ions effectively transformed the trigonal structure of BiFeO3into a cubic phase, thereby reducing the lattice mismatch with silicon to 2.8%. High-quality, highly oriented, silicon-based cubic Sr,Ti:BiFeO3thin films were successfully fabricated using radio frequency magnetron sputtering. Due to the induced lattice distortion, the characteristic periodic spiral spin antiferromagnetic structure of BiFeO3was suppressed, resulting in a significant enhancement of the saturation magnetization of cubic Bi0.5Sr0.5Fe0.5Ti0.5O3(48.0 emu/cm3), compared to that of pristine BiFeO3(5.0 emu/cm3). Furthermore, the incorporation of Sr2+and Ti4+ions eliminated the birefringence effect inherent in trigonal BiFeO3, thereby inducing a pronounced magneto-optical effect in the cubic Sr,Ti:BiFeO3thin film. The magnetic circular dichroic ellipticity (ψF) of Bi0.5Sr0.5Fe0.5Ti0.5O3reached an impressive 2300 degrees/cm.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jianzhi Yu,Xucong Liu,Mengjin Zhong,Shiwei Yang,Li Li,Bo Chi,Jian Pu
A reversible solid oxide cell (RSOC) can generate electricity and hydrogen, respectively, when operating in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes. However, at high current densities, serious Sr segregation in the traditional La0.6Sr0.4Co0.2Fe0.8O3−δ-Gd0.1Ce0.9O2−δ (LSCF-GDC) oxygen electrode leads to a decrease in the catalytic activity of the cathode and consequently poor performance stability of RSOC. In this work, Ca doping was proposed to suppress Sr segregation in the LSCF-based composite electrodes. The smaller radius of the Ca atom could reduce the elastic driving force of Sr segregation, while the reasonable Ca-doping concentration could alleviate the steep oxygen vacancy gradient formed under high current density and thereby reduce the electrostatic driving force of Sr segregation. Consequently, after appropriate Ca substitution at the A-site, the prepared La0.6Sr0.2Ca0.2Co0.2Fe0.8O3−δ-Gd0.1Ce0.9O2−δ(LSCCF-GDC) oxygen electrode reported significantly enhanced stability during long-term operation at high current density. At 750 °C and a current density of 1.2 A·cm–2, the degradation rates of the cell with LSCCF-based composite oxygen electrode were 10 mV/100 h in SOFC mode and 17 mV/100 h in SOEC mode, which was much lower compared with the corresponding values of the cell with the traditional LSCF-based composite oxygen electrode (18 mV/100 h in SOFC mode and 82 mV/100 h in SOEC mode).
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Pan Liang,Lianqing Li,Tong Shen,Wenli Lian,Zhihong Liu
In this work, through a facile method of low-temperature (only 350 °C) self-reduction, 1D nano-sized M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) blue phosphors with highly efficient performance can be obtained. The crystal structure, morphology and photoluminescence (PL) properties including thermal stability of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors were investigated. The M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors show broad band excitation spectra and narrow band emission spectra . The photoluminescence quantum yields (PLQY) of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) are as high as 98% and 87.2%, respectively. Furthermore, the color purities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) can reach 99.1% and 93.2%, respectively. When heated up to 150 °C, the emission intensities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors can still keep 72.7% and 80.0%, respectively. Finally, the above-mentioned phosphors exhibit outstanding performance when manufacturing WLEDs.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Ziwei Dong,Tian Xia,Qiang Li,Jingping Wang,Shuang Li,Liping Sun,Lihua Huo,Hui Zhao
Highly active cathode materials are crucial to accelerating the commercialization of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Herein, Sr-doped Pr 0.94 Ba 1- x Sr x Co 2 O 5+ δ (PBS x CO) perovskite oxides are evaluated by experimental and theoretical studies. The phase transformation from tetragonal layered double perovskite to cubic simple perovskite can be identified with increasing the Sr fraction. Benefiting from enhanced electrical conductivity and oxygen surface rate, the PBS x CO catalysts deliver excellent electrochemical performance, as evidenced by symmetrical and completed cells test. Among all compositions, the Pr 0.94 Ba 0.7 Sr 0.3 Co 2 O 5+ δ (PBS0.3CO) cathode has the lowest polarization resistance ( R p ) of 0.031 Ω cm 2 at 700 °C. The PBS0.3CO cathode-based fuel cell produces a peak power density of 1077 mW cm −2 , along with a steady operating for 130 h at 700 °C. From the density functional theoretical (DFT) calculations, it is discovered that stronger Co 3d-O 2p hybridization is recognized in the Sr substituting model compared with undoped one. Furthermore, the decreased free energy for oxygen adsorption may facilitate the oxygen reduction reaction (ORR) kinetics. These findings highlight the origin of optimal ORR activity induced by A-site alkaline earth doping in the perovskite catalysts, endowing the rational design of oxide catalysts.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Yu Hui Huang,Cheng Chao Hu
Two novel low- ε r gallates MGa 2 O 4 (M = Ca, Sr) have been synthesized via a standard solid-state reaction method. According to the X-ray diffraction results, CaGa 2 O 4 crystallizes in space group Pna2 1 with an orthorhombic symmetry, while SrGa 2 O 4 belongs to the monoclinic P2 1 / c system. Both ceramics show ever-improving microstructures with the increasing sintering temperature . The optimal microwave dielectric properties ( ε r = 9.2, Qf = 66,000 GHz, τ f =–85 ppm/°C for SrGa 2 O 4 and ε r = 10.6, Qf = 15,400 GHz, τ f =–58 ppm/°C for CaGa 2 O 4 ) are obtained when sintered at 1275 °C. A patch antenna is fabricated using SrGa 2 O 4 ceramics as the substrate, which realizes a return loss of –19.94 dB and total efficiency of –1.38 dB (72.8 % in power ratio) at 4.84 GHz. The exceptional performances indicate that SrGa 2 O 4 ceramics are promising candidates for antenna applications at the Sub-6 GHz band.
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