ADVANCED POWDER TECHNOLOGY
·
2017
·
IF 2.659
Qing Hu,Weihui Jiang,Xiaofeng Chen,Yuli Li,Qiming Liang
We synthetized a series of strontium-substituted submicron bioactive glasses spheres (Sr-SBG, SiO 2 -P 2 O 5 -CaO-SrO) in which strontium was substituted for calcium on a mole percentage basis, then investigated the effect of strontium-substituted amount on morphologies, physicochemical properties, apatite-forming bioactivity of SBG and evaluated the proliferation, differentiation and mineralization of Sr-SBG with different strontium substitution amounts by co-cultured with human dental pulp cells (HDPCs). Results showed that Sr-SBG with different strontium substitution amounts were successfully fabricated and substituting different strontium amounts did not affect the morphology and particle size of SBG. All the Sr-SBG possessed good apatite-forming ability, but substituting a certain amount of strontium for calcium would weaken the apatite-forming ability of SBG. Additionally, all the Sr-SBG extractions promoted proliferation, early odontogenic differentiation and mineralization of HDPCs, however, the cell proliferation, differentiation and mineralization abilities would be reduced when the substituted amount of strontium was excess (15 mol%). This study suggests that Sr-SBG with moderate strontium substitution amounts can be used as a more promising biomaterial for dental repair.
研究领域:
材料科学
·
生物医学工程
·
口腔医学
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DOI
高影响因子
BIOMATERIALS
·
2018
·
IF 8.806
Xuzhu Wang,Jundong Shao,Mustafa Abd El Raouf,Hanhan Xie,Hao Huang,Huaiyu Wang,Paul K. Chu,Xue-Feng Yu,Yang Yang,AbdelBasit M. AbdEl-Aal,Nefissa H.M. Mekkawy,Richard J. Miron,Yufeng Zhang
A near-infrared (NIR) light-triggered drug delivery platform is produced by incorporating SrCl 2 and BP nanosheets (BPs) into poly(lactic- co -glycolic acid) (PLGA) for bone regeneration . The fabricated BP-SrCl 2 /PLGA microspheres show efficient NIR absorption and photothermal effects due to the BPs. The NIR-triggered release behavior of Sr 2+ by flawing the PLGA shells is investigated and the microspheres exhibit excellent cell viability and biodegradability . Implantation of the BP-SrCl 2 /PLGA microspheres into a rat femoral defect demonstrates good tissue compatibility and excellent bone regeneration capacity under NIR light irradiation. Our study indicates that local release of Sr 2+ at optimal time periods controlled by NIR irradiation improves bone regeneration significantly and this NIR-triggered drug delivery system composed of BPs is suitable for therapies requiring precise control at specific time.
研究领域:
生物医学工程
·
材料科学
·
骨科研究
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 47
·10750-10753
·
IF 3.858
Lingqing Dong,Kui Cheng,Wenjian Weng,Weiqiang Han
In this communication, strontium titanate (SrTiO3) nanocrystals with tailored surface structures have been synthesized by the hydrothermal method using potassium hydroxide (KOH) and lithium hydroxide (LiOH) as the mineralization agents. The results show that the surface structure adjusted by introducing different mineralization agents dictates not only the corresponding size and shape but also the dielectric properties of the obtained SrTiO3 nanocrystals.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Jiufeng Dong,Renchao Hu,Yujuan Niu,Li Li,Shuai Li,Liang Sun,Yuqi Liu,Xinglei Deng,Liuting Li,Xinwei Xu,Zizhao Pan,Hong Wang
Wide bandgap inorganic layers exhibit the effect to improve the insulating properties as charge barrier layers between the electrode and polymer dielectrics . However, their influence mechanisms on the high-temperature breakdown behavior still need to be further revealed. Herein, the in-situ grown strontium oxide (SrO) layers were coated on the surfaces of polyimide (PI) film to conduct this research. Compared with neat PI, the breakdown strength and discharge energy density (efficiency >90%) of the coated film was significantly elevated up 45% and 1000% at 200 °C, respectively. The experimental results show that SrO greatly reduces the entropy of surface molecular conformations and increases the energy level of localized states of PI film. The SrO coating effectively improves the injection barrier and interface trap levels simultaneously, undertakes a higher electric field, and hinders the destruction of PI film's surface molecules by high-energy electrons, thus reducing the conduction loss and constraining the generation and development of electrical trees at high fields. This work not only provides a comprehensive insight into the in-situ oxide coating on the insulating properties in polymer dielectrics but also offers a paradigm for developing scalable dielectric materials with high breakdown strength used in harsh-condition electrification.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yi Wang,Jianlong Wang,Li'an Hou
Reverse osmosis (RO) membranes have been widely applied in the increasingly discharged radioactive wastewater treatment . However, conventional RO membranes suffer from the issues of the limited nuclides rejections and the relatively low water permeance. In this work, a new type of RO membrane with decoration of crown ethers (15C5 and 18C6) was prepared via an interfacial polymerization process to remove the radionuclide-contaminated components. Due to the special hollow structure of crown ethers (CEs) and the hydrogen bonding within the amidogen, the obtained MPD@15C5-TMC and MPD@18C6-TMC membranes exhibited smoother surfaces and thinner polyamide active layers than the pristine MPD-TMC membrane. The optimized MPD@15C5-TMC and MPD@18C6-TMC RO membranes presented excellent pure water permeances up to 2.16 and 2.91 L m −2 h −1 bar −1 , and maintained high rejections towards Cs + , Sr 2+ and Co 2+ , respectively. Furthermore, the membrane possessed a remarkable operational stability and an excellent anti-fouling property. These results confirmed the possibility of adopting crown ethers for RO membrane fabrication and verified their great potential for the practical application in removing radioactive elements from wastewater.
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
Electronic Materials Letters
·
2025
·
IF 2.6
Zhang Ligang,Xu Xiaoming,Ma Lihong,Wang Haosen
A series of Er 3+ /Eu 2+ -activated SrS/SrZnSO with different Er 3+ /Eu 2+ concentrations were synthesized at 1300℃ for 3 h through high temperature solid-state reaction, and their persistence luminescence and mechanoluminescence properties were studied. Upon 450 nm laser excitation, SrS/SrZnSO:Er 3+ /Eu 2+ emitted orange-red light, which could be observed with the naked eyes. When the laser was removed, it showed long afterglow orange-red luminescence. The brightness and duration of the long afterglow increase with the increase concentration of Er 3+ /Eu 2+ from x:y = 0.5%:1% to 3%:1%. SrS/SrZnSO:Er 3+ /Eu 2+ was confirmed as an excellent persistent luminescence material since it could continuously emit light for nearly 10 min. Moreover, under pressure stimulation SrS/SrZnSO:Er 3+ /Eu 2+ showed a novel type of mechanoluminescence (ML) with the emitting bright green light which linearly depended on the force. Under the same force of friction, the sample SrS/SrZnSO:Er 3+ /Eu 2+ with Er 3+ /Eu 3 = 1%:0% emitted the strongest ML among prepared samples. Furthermore, the mechanism of mechanoluminescence was studied in details. This study can expand the family of ML materials while promoting the applications of mechanoluminescence materials in damage diagnosis, human-machine interfaces, and pressure sensing. Graphical
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Weiwei Li,Haijun Huang,Bingchu Mei,Jinghong Song
In this paper, ytterbium doped strontium fluoride (Yb: SrF 2 ) nanoparticles were synthesized by direct precipitation method. High-speed centrifugation was used to separate high sintering activity of nanopowders from powders with hard aggregated and large size. Using powders at different parts of the centrifugal tube as starting powders, Yb: SrF 2 transparent ceramics was fabricated by hot pressed (HP) method for the first time. Effects of morphology and particle size on the sinterability of Yb: SrF 2 nanopowders were investigated. The transmittance reached 77% at the wavelength of 1200 nm and pores stilled remained in the ceramics. The spectroscopic and thermal properties of Yb: SrF 2 transparent ceramics were also investigated. This paper provides an effective way to obtain well dispersed and high sinterability nanoparticles for SrF 2 ceramics sintering.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Siwen Pi,Jie Li,Yingde Zhang,Weina Zhou,Hui Liu,Qing Wang
M-type strontium ferrite Sr 0.98 Ce 0.02 Dy x Fe 12- x O 19 ( x =0.00-0.20) doped with Ce-Dy elements was prepared by solid-phase sintering. The X-ray diffraction (XRD) results revealed the formation of the M-type hexaferrite having P6 3 /mmc as a space group along with the co-existence of a secondary DyFeO 3 phase; The field emission scanning electron microscopy (FESEM) results show that the grain boundaries of the samples are clear, the crystallinity is good and the grains have been refined; The purity of the sample can be proved by energy dispersive spectrometer (EDS), and no other elements were found except for doped elements; It is clear that the experimental weight percentages of each element are quite close to the theoretical from the reactants used to synthesize each sample. Meanwhile, the FTIR results show tetrahedral and octahedral tensile vibration peaks induced by Fe–O bonds of M-type strontium ferrite; Through the analysis of the vibrating sample magnetometer (VSM), when the doping amount of Dy element is x =0.08, the coercive force of strontium ferrite is increased. At this time, hard ferrite with high coercive force and high saturation magnetization intensity is prepared. Demonstrating the unlimited potential of M-type strontium ferrite in the fields of magnetic recording and storage devices.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Juan Xie,Chen Yang,Ming Duan,Junlei Tang,Yingying Wang,Hu Wang,Jérémie Courtois
As a new photocatalyst , the photocatalytic hydrogen production performance of strontium titanate (SrTiO 3 , STO) modified by amorphous NiP was studied. The main purpose was to study the effect of amorphous NiP on hydrogen generation of STO under ultraviolet (UV) light irradiation. In this paper, STO catalysts were synthesized by hydrothermal method and the amorphous NiP was modified on the surface of STO by chemical plating method. The photocatalysts were characterized by X-ray diffraction (XRD), ultraviolet visible diffuse reflectance spectroscopy (DRS), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that hydrogen generation rate of STO modified by amorphous NiP (NiP/STO) is much higher than that of STO. Furthermore, the deposition time of chemical plating affects the hydrogen generation performance a lot. The results demonstrate that when the deposition time is 10 s, the hydrogen generation rate reaches almost 3 times higher than the other deposition time. The DRS results indicate that NiP/STO has narrower band gap than STO. Combination of the results of DRS, Mott-schottky (M-S) and XPS, the mechanism of photocatalytic hydrogen generation was obtained. The cause of higher hydrogen generation rate may be ascribed to the different electronic migration path in NiP/STO.
研究领域:
材料科学
·
能源科学
✓ 已验证
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).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yupeng Xie,Jie Wang,Yaocheng Hu,Jing Zhang,Yong Gao,Haipeng Li,Sheng Wang
The contamination of fission products ( 90 Sr and 137 Cs) on the metallic material (316L stainless steel) of alkaline spent fuel storage pond threatens to decommission nuclear facilities. Compared with previous studies unable to detect Cs on the surface of contaminated steel by laser-induced breakdown spectroscopy (LIBS), this study selected the emission lines of Sr II 407.74 nm and Cs I 455.77 nm as the analytical spectral lines of LIBS, and for the first time satisfactorily measured and analyzed the accumulation of Sr and Cs on the surface of 316L stainless steel for 7, 14, 21, 30 and 60 days, respectively. It was found during the accumulation, the concentration of Sr and Cs on the surface reached their maximum after 21 days, and relatively stabilized 30 days later. In addition, combined with the physicochemical characterizations, the contamination mechanism of Sr and Cs on 316L stainless steel was proposed, with the contaminants gradually diffusing from the oxide layer dissolved and damaged in the alkaline corrosive environment to the matrix. Strontium had two forms on the steel surface: SrCrO 4 in the oxide layer and SrCO 3 in the matrix, but the contamination of Cs was more inclined to the surface than Sr.
研究领域:
材料科学
·
核能工程
·
表面分析
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Peigang He,Jingyi Cui,Meiling Wang,Shuai Fu,Hualong Yang,Chengyue Sun,Xiaoming Duan,Zhihua Yang,Dechang Jia,Yu Zhou
Notwithstanding the success of carbon-free nuclear power in the new energy industry, an effective way to address nuclear contamination is still lacking. As a generally accepted method to date, immobilization of radioactive nuclear wastes with inexpensive and environment-friendly matrix such as geopolymer has attracted extensive attention. In this contribution, Na-based and K-based metakaolin geopolymer were prepared to encapsulate simulated radioactive Cs + and Sr 2+ under different temperatures and environments during long-term leaching tests. The temperature-dependent and environmental-dependent leaching kinetics as well as their dominant leaching mechanisms have been revealed. The results showed that Na-based and K-based geopolymer exhibited better immobilization performance than that of Portland cement, ceteris paribus. For the immobilization of Cs + , Na-based geopolymer showed lower leaching rate than K-based geopolymer under the same leaching conditions. Both higher temperature and salt solution accelerated the leaching behaviors of Sr + and Cs 2+ from the encapsulation matrix. This contribution sheds light on understanding the dominant leaching mechanisms of hazardous elements under different storage environments and highlights the significance of salt-tolerant matrix for the immobilization of nuclear wastes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）