CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 23
·39700-39706
·
IF 5.2
Xinkun Liu,Ying Dai,Xinmei Pei,Wen Chen
Ferroelectric thin films with giant room-temperature electrocaloric effect (ECE) could be very useful in design of solid-state refrigeration devices. Here, lead-free Ba 0.85 Ca 0.15-x Sr x Zr 0.1 Ti 0.9 O 3 (BCZT-xSr, 0.01 ≤ x ≤ 0.10) thin films are successfully prepared on the substrates (Pt/Ti/SiO 2 /Si) via sol-gel route, and the effect of the Sr substitution on the structure, electric properties and ECE of the films were investigated. The dielectric analyses show that the rhombohedral-tetragonal phase transition temperature (T R-T ) move to a higher temperature and the tetragonal-cubic phase transition temperature (T m ) shift to a lower temperature with increasing Sr content, and finally the T R-T peaks merge into the T m peaks at room temperature. The BCZT-0.05Sr film presents a giant ECE with ΔT = 27.1 K and ΔS = 30.6 J K −1 kg −1 at 800 kV cm -1 near room temperature (301 K). The giant ΔT benefits from a multiphase coexisting region with successive R-T and T-C phase transition character near room temperature. These results indicate that the lead-free Sr-doped BCZT thin film is an attractive material for application in ECE refrigeration devices.
研究领域:
材料科学
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凝聚态物理
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功能材料
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热电转换
·
固态制冷
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DOI
高影响因子
TISSUE & CELL
·
2020
·
IF 1.837
Biao Hu,Zeng-Dong Meng,Yu-Qin Zhang,Li-Yuan Ye,Cheng-Jian Wang,Wei-Chun Guo
Background Ideal bone defect repair scaffolds should be biodegradable, biocompatible, bioactive, porous, and provide adequate mechanical support. However, it is challenging to fabricate such an ideal bone repair scaffold. Previously, we showed that 5 wt.% strontium-doped hydroxyapatite (Sr-HA) scaffolds prepared by spark plasma sintering (SPS) technology exhibited good biocompatibility. Moreover, unlike pure hydroxyapatite (HA) scaffolds, HA scaffolds containing strontium (Sr) exhibited superior bioactivity, higher proliferation rate of BMSCs and MG-63 osteoblast cells, as well as enhanced BMSCs differentiation. Methods In this study, we prepared pure HA scaffolds and 5 wt.% strontium containing Sr-HA scaffolds by SPS technology without adhesive, ammonium bicarbonate as pore former. Subsequently, scanning electron microscope (SEM) and X-Ray diffraction (XRD) were used to characterize the properties of Sr-HA and HA scaffolds. The ability of the scaffolds to repair bone defects was evaluated using a critical-sized rabbit tibia-bone defect rabbit model. Thirty 3-month-old New Zealand white rabbits were randomly divided into three groups (blank control group, Sr-HA scaffolds implanted group and HA scaffolds implanted group) with 10 rabbits in each group. These rabbits are sacrificed after 8 weeks and 16 weeks of surgery, and the repair effects of each scaffold were evaluated with X-ray, micro-CT, and HE staining. The three-point bending test was employed to assess the mechanical property of repaired bones. Results XRD pattern indicated that Sr-HA and HA scaffolds possess a similar crystal structure after sintering, and that incorporation of strontium did not form impure phase. SEM showed that the porosity of Sr-HA and HA scaffolds was about 40 %. Universal Testing Machine tests showed that Sr-HA scaffolds had better compressive strength than HA scaffolds. Bone defect was obvious, and the fibrous tissue was formed in the bone defects of rabbits in the blank control group after 8 weeks of surgery. Sr-HA and HA scaffolds enhanced osteointegration of the host bone, and extensive woven bone was formed on the surface of the Sr-HA scaffolds. After 16 weeks, the bone strump became blunt and a small amount of callus was formed in the blank control group. Comparatively, the scaffolds were substantially degraded in the Sr-HA scaffolds implanted group while scaffolds shadows still were observed in the HA implanted group. Bone remodeling and cavity recanalization were completely developed in the Sr-HA scaffolds group. The compressive strength of repaired bone in the Sr-HA scaffolds implantation group was higher than that of HA scaffolds implantation group after 8 weeks and 16 weeks of surgery. Conclusions Our results show that the Sr-HA composite scaffolds can effectively repair bone defects and have good biodegradable properties.
研究领域:
生物材料学
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骨组织工程
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生物医学工程
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再生医学
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生物力学
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口腔颌面外科
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纳米医学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tonglu Huang,Man Wang,Xiaolei Nie,Wanting Zhu,Yu Zhang,Mingrui Liu,Wenyu Zhao
High-performance infrared (IR) radiative materials are important for energy conservation and electronic thermal management, yet effective strategies for simultaneously enhancing short- and long-wave IR emissivity remain limited. Herein, Sr-substituted barium hexaferrite (Ba 1− x Sr x Fe 12 O 19 , x = 0, 0.1, 0.3, and 0.5) powders were synthesized via chemical co-precipitation, and the effects of Sr substitution on the crystal structure, optical properties, and IR radiative performance were systematically investigated. Sr substitution at Ba sites induced lattice contraction and modified the local structural environment. The apparent optical bandgap decreased from 3.59 eV for BaFe 12 O 19 to 2.92 eV for Ba 0.7 Sr 0.3 Fe 12 O 19 . In the 2.5–5 μm band, Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.62, corresponding to a 72.2% increase relative to BaFe 12 O 19 , which is associated with the reduced apparent optical bandgap and modified surface Fe/O chemical states detected by XPS. In the 8–14 μm band, the enhanced emissivity is mainly attributed to lattice-distortion-induced changes in the vibrational response, and Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.90, representing a 3.4% increase over BaFe 12 O 19 . In the 2.5–15 μm range, its average emissivity reached 0.80, which is 63.3% higher than that of BaFe 12 O 19 . Furthermore, the Ba 0.7 Sr 0.3 Fe 12 O 19 /PVDF composite coating achieved a 6.5 °C reduction relative to a bare Cu plate and a 3.8 °C reduction relative to a pure PVDF coating. This work provides a low-cost and scalable strategy for improving the IR radiative performance of BaFe 12 O 19 -based materials through cation substitution and structural regulation, offering a promising route for thermal management in next-generation electronic devices.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuxuan Hou,Ruowei Yin,Junjie Li,Xiaopo Su,Chuanbao Liu,Yang Bai
Electrocaloric effect (ECE) is one of the basic features of ferroelectrics / antiferroelectrics. The positive ECE and negative ECE exhibit oppose thermal response to the variation of electric fields. This allows them to complement each other, enabling more diversified refrigeration regulation. To enhance the negative ECE and broaden its temperature range, this work investigates the impact of diffuse phase transitions in antiferroelectric Pb 1- x Sr x Zr 0.95 Ti 0.05 O 3 (PSZT) films on LaNiO 3 /Si substrates. Sr 2 + doping reduces the unit cell volume and enhances antiferroelectricity, resulting in an increment of the ECE Δ T from −2.26 K to −3.38 K. Meanwhile, it breaks the long-range antiferroelectric order to achieve a local symmetry breaking, and promotes the diffusion of the antiferroelectric-ferroelectric phase transition to significantly broaden the temperature span of the negative ECE from 33 K to over 108 K. This work demonstrates that controlling the phase transition diffusion in PSZT films effectively enhances the performance of the negative ECE and broadens its temperature span, providing a strong support for in-situ chip cooling technology.
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Wenwen Wang,Jianqiang Luo,Wei Wei,Shujuan Liu,Junhui He,Jianguo Ma
The development of effective, economical, and sustainable seawater extraction strontium techniques is of great significance to the environment and industrial needs. In this paper, an asymmetric pulsed current-assisted electrochemical (AP-CE) method was used to extract Sr(Ⅱ) from seawater using a carbon electrode modified by dibenzo-18-crown-6-ether and cellulose acetate. An asymmetric pulsed current was used to prevent unwanted cations from blocking adsorption sites to prevent water splitting. It also prevented the cellulose acetate membrane from sealing the crown ether. Compared with traditional physicochemical adsorption of Sr(Ⅱ), the AP-CE method achieved a higher removal efficiency and adsorption capacity. When the concentrations of Sr(Ⅱ) were 10, 20, 50, and 100 mg L −1 , the removal efficiencies of Sr(Ⅱ) were 99.3%, 97.6%, 97.3%, and 96.1%, and the adsorption capacities of Sr(Ⅱ) were 14.9, 29.3, 73.0, and 144.2 mg g −1 , respectively. This method exhibited excellent selectivity for Sr(Ⅱ) adsorption from simulated seawater, suggesting that the asymmetric pulse electrochemical method is promising for extracting strontium ions from seawater.
研究领域:
环境科学
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工业化学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Pingxiao Wu,Yaping Dai,Hang Long,Nengwu Zhu,Ping Li,Jinhua Wu,Zhi Dang
Organo-montmorillonites (organo-Mts) were prepared by grafting with 3-aminopropyl triethoxysilane (APTES), and surface modification which was composed of hexadecyl trimethyl ammonium bromide (HDTMAB) and sodium dodecyl sulfate (SDS) solutions. XRD, BET, FTIR, SEM and Zeta potential analysis were used to characterize the surface and structure properties of the as-obtained products. The XRD and FTIR results showed that APTES was successfully grafted to calcium-saturated montmorillonite (Ca-Mt) and the BET data illustrated that the surface area and microporous volume decreased largely after modification, while the pore diameter increased. Moreover, batch experiments were conducted to investigate the adsorption behavior of Sr(II) on organo-Mts. The experimental results showed that the adsorption capacity of APTES-Mt was 65.6 mg/g, much larger than those of Ca-Mt, SDS-Mt and HDTMAB-Mt (13.23 mg/g, 26.85 mg/g and 3.91 mg/g, respectively) under the chosen conditions. Pseudo-second-order model fitted well with the adsorption kinetic studies for all materials with an equilibrium time of 24 h. Further, the isotherm adsorption could be described well with both Langmuir and DKR models for SDS-Mt, Freundlich model for Ca-Mt and APTES-Mt as well. The Sr(II) removal by Ca-Mt was mainly ion exchange, nevertheless, that by SDS-Mt and APTES-Mt were surface adsorption and ligand adsorption, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1783
·
IF 3.4
Chuanqi Liu,Wen Zhang,Dingyu Yang,Haibo Tian,Jun Zhu
The all-inorganic perovskite cesium lead bromine (CsPbBr3) has attracted much attention in the field of X-ray detectors because of its high X-ray absorption coefficient, high carrier collection efficiency, and easy solution preparation. The low-cost anti-solvent method is the main method to prepare CsPbBr3; during this process, solvent volatilization will bring a large number of holes to the film, leading to the increase of defects. Based on the heteroatomic doping strategy, we propose that Pb2+should be partially replaced by Sr2+to prepare leadless all-inorganic perovskite. The introduction of Sr2+promoted the ordered growth of CsPbBr3in the vertical direction, increased the density and uniformity of the thick film, and achieved the goal of CsPbBr3thick film repairing. In addition, the prepared CsPbBr3and CsPbBr3:Sr X-ray detectors were self-powered without external bias, maintaining a stable response during on and off states at different X-ray dose rates. Furthermore, the detector base on 160 µm CsPbBr3:Sr had a sensitivity of 517.02 µC Gyair−1cm−3at zero bias under the dose rate of 0.955 µGy ms−1and it obtained a fast response speed of 0.053–0.148 s. Our work provides a new opportunity to produce cost-effective and highly efficient self-powered perovskite X-ray detectors in a sustainable way.Keywords:X-ray;self-powered detectors;perovskite thick film;Sr-doped CsPbBr3
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DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Qinzhen Li,Yesen Tan,Baoyu Huang,Sha Yang,Jinsong Chai,Xiaoping Wang,Yong Pei,Manzhou Zhu
Unraveling the evolution mechanism of metal nanoclusters is of great importance in understanding the formation and evolution of metallic condensed matters. In this work, the specific evolution process between a pair of gold nanocluster (Au NC) isomers is completely revealed by introducing hydride ligands to simplify the research system. A hydride-containing Au NC, Au22(SR)15H, was synthesized by kinetic control, and the positions of the hydrides were then confirmed by combining X-ray diffraction, neutron diffraction, and DFT calculations. Importantly, a reversible structural isomerization was found to occur on this Au22(SR)15H. By combining the crystal structures and theoretical calculations, the focus was placed on the hydride-binding site, and a [Au–H] migration mechanism of this isomerization process is clearly shown. Furthermore, this [Au–H] migration mechanism is confirmed by the subsequent capture and structural determination of theoretically predicted intermediates. This work provides insight into the dynamic behavior of hydride ligands in nanoclusters and a strategy to study the evolution mechanism of nanoclusters by taking the hydride ligand as the breakthrough point.
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Yu Chen,Zhiyu Yang,Jiance Jin,Jianwei Qiao,Yuzhen Wang,Maxim S. Molokeev,Hendrik C. Swart,Zhiguo Xia
Exploring oxide-based red-emitting phosphors is essential for improving the color rendering index (Ra) and reducing the correlated color temperature (CCT) of white-light-emitting diode (LED) lighting sources. Especially, it is challenging to design Eu2+ red emission in inorganic solids. Here, the Eu2+-activated oxide phosphor Sr2LaGaO5:Eu2+ was synthesized with red emission peaking at 618 nm under 450 nm excitation. The crystal structure and spectral analysis indicate that Eu2+ tends to occupy [Sr1/LaO8] polyhedrons with a smaller coordination number, resulting in a large crystal field splitting at the 5d level and realizing the broadband 4f–5d red emission. When Sr is substituted by Ba atoms, density functional theory calculations verify that Ba tends to enter [Sr2O10] with a large coordination number, further giving rise to the lattice distortion and a giant spectral redshift (618–800 nm). The white LED device fabricated by mixing red Sr1.8Ba0.2GaO5:Eu2+ and green Lu3Al5O12:Ce3+ phosphors exhibits a high color rendering index (Ra = 92.1) and a low color-dependent temperature (CCT = 4570 K). This study will give guidance for exploring new Eu2+ activated oxide-based red phosphors as well as achieving tunable emission through cations’ substitution.
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jiang-bo Huo,Guoce Yu,Jianlong Wang
In this study, a new adsorbent, polyvinyl alcohol (PVA) and graphene oxide (GO), was prepared, characterized and used for the removal of Sr 2+ from aqueous solution. In PVA/GO composite, the inter-lamellar spacing of adjacent GO layers was dramatically enlarged due to the intercalation of PVA molecules, such a unique architecture significantly mitigated the aggregation of GO layers, which facilitated the accessible exposure of active sites and the mass transfer of strontium ions (Sr 2+ ), thus enhancing the adsorption capacity toward Sr 2+ . The adsorption of Sr 2+ by PVA/GO composite conformed to the pseudo second-order kinetic model ( R 2 = 0.9994), the Langmuir model ( R 2 = 0.9042), and the Freundlich model ( R 2 = 0.9598). The complexation interaction between Sr 2+ and oxygen atoms/π-electron domain of PVA/GO composite was primarily responsible for the adsorption mechanism, based on the characterization results of X-ray photoelectron spectroscopy (XPS), scanning electron microscope equipped with energy dispersion spectroscopy (SEM-EDS) and powder X-ray diffraction (PXRD).
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Li Fu,Yong Huang,Wen Cai,Huaiwei Zhang,Jiehui Yang,Dihua Wu,Weitao Su
Improving the hydrophilicity of titania nanotubular arrays (TNAs) could promote their interfacial reaction rate when they interact under aqueous conditions. In this work, we proposed a simple hydrothermal method for Si and Sr doping. A significant hydrophilicity improvement could be observed in TNAs after the doping process. Therefore, Si@Sr/TNAs exhibited a superior urease loading and showed excellent chronocoulometric performance towards urea interaction.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yi Cao,Baoping Lin,Ying Sun,Hong Yang,Xueqin Zhang
La x Sr 1 − x Cu 0.1 Mn 0.9 O 3 − δ (LNF- x ) (0.1 ⩽ x ⩽ 1) nanofibers are prepared by electrospun method. The structure of LNF- x and the electrochemical properties of LNF- x in 1 M Na 2 SO 4 aqueous electrolyte are investigated. As a result, LNF- x nanofibers present a perovskite structure, and the LNF-0.5 sample exhibits the highest specific capacitance value of 464.5 F g − 1 at a current density of 2 A g − 1 . The maximum energy density of 64.5 W h kg − 1 are achieved at a power density of 2 kW kg − 1 for the symmetric supercapacitor prepared by La 0.5 Sr 0.5 Cu 0.1 Mn 0.9 O 3 − δ nanofibers. More importantly, this symmetric supercapacitor also shows an excellent cycling life after 2000 charging and discharging cycles. Those results offer a suitable design of electrode materials for high-performance supercapacitors.
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产品关联
DOI
高影响因子
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