JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 23
·13243-13258
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IF 4.22
Cao Yi,Tang Peiyuan,Li Shijingmin,Qiu Wenfeng
Abstract Since the previous research confirms the lanthanum titanate (LTO) flexible self-supporting film can be considered as excellent energy storage material, we intend to maximize the performance of LTO to provide higher energy density for practical application. In order to achieve this goal, the Sr element was a choice to substitute with La for increasing the amount of oxygen vacancies in this study, and mechanical flexibility of the film was also maximally preserved. For determining the most appropriate amount of Sr doping, a serious of Sr-doped LTO films marked as LTO- x (0.1 ≤ x ≤ 0.5) were synthesized by electrospinning combined with calcination method. After analyzed by the XRD, SEM, TEM, XPS and electrochemical work station, the LTO-0.3 sample shows the best properties with a maximum capacitance of 1.8 F·cm −2 at 2 mA·cm −2 . As a result of that, we fabricated the flexible all-solid-state supercapacitor device with two LTO-0.3 electrodes and PVA-Na 2 SO 4 gel. This LTO-0.3//LTO-0.3 device exhibits excellent cycling stability, outstanding flexibility and high energy density of 209.4 μWh·cm −2 with the corresponding power density of 2.1 mW·cm −2 . Graphical Abstract
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JOURNAL OF PHYSICS-CONDENSED MATTER
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2021
·Vol. 33
·期 26
·265701
·
IF 2.333
Chengping He,Xue Ming,Qing Li,Xiyu Zhu,Jin Si,Hai-Hu Wen
Recently, superconductivity at about 9–15 K was discovered in Nd1−xSrxNiO2 (Nd-112, x ≈ 0.125–0.25) infinite-layer thin films, which has stimulated enormous interests in related rare-earth nickelates. Usually, the first step to synthesize this 112 phase is to fabricate the RNiO3 (R-113, R: rare-earth element) phase, however, it was reported that the 113 phase is very difficult to be synthesized successfully due to the formation of unusual Ni3+ oxidation state. And the difficulty of preparation is enhanced as the ionic radius of rare-earth element decreases. In this work, we report the synthesis and investigation on multiple physical properties of polycrystalline perovskites Sm1−xSrxNiO3 (x = 0, 0.2) in which the ionic radius of Sm3+ is smaller than that of Pr3+ and Nd3+ in related superconducting thin films. The structural and compositional analyses conducted by x-ray diffraction and energy dispersive x-ray spectrum reveal that the samples mainly contain the perovskite phase of Sm1−xSrxNiO3 with small amount of NiO impurities. Magnetization and resistivity measurements indicate that the parent phase SmNiO3 undergoes a paramagnetic–antiferromagnetic transition at about 224 K on a global insulating background. In contrast, the Sr-doped sample Sm0.8Sr0.2NiO3 shows a metallic behavior from 300 K down to about 12 K, while below 12 K the resistivity exhibits a slight logarithmic increase. Meanwhile, from the magnetization curves, we can see that a possible spin-glass state occurs below 12 K in Sm0.8Sr0.2NiO3. Using a soft chemical reduction method, we also obtain the infinite-layer phase Sm0.8Sr0.2NiO2 with square NiO2 planes. The compound shows an insulating behavior which can be described by the three-dimensional variable-range-hopping model. And superconductivity is still absent in the polycrystalline Sm0.8Sr0.2NiO2.
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yan Yu,Lele Zhou,Juntao Tang,Peng Wu,Li Feng,Beixiao Ge,Hui Chen,Jinxing Hu,Shuang Song,Tao Zeng
Adsorption of pollutants onto adsorbents is extremely important for water purification systems. In this study, the dynamic adsorption of radionuclides Co(II) and Sr(II) onto covalent triazine frameworks (CTFs) was explored. The effects of the adsorption conditions such as the amount of CTF (10, 25, and 50 mg), radionuclides concentrations (0.50–500.0 mg L −1 ), and adsorption temperature (293, 303, and 313 K) on the adsorption capacity was examined. Adsorption kinetics data were analyzed by using the pseudo-first-order and pseudo-second-order kinetic models. Langmuir and Freundlich models were used for analyzing adsorption isotherms. The results showed that the Langmuir isotherm and pseudo-second-order models described the experimental data better than the other models. The adsorption equilibrium time of CTF-N and CTF-B are 600 s and 200 s. The maximum monolayer adsorption capacity (q max ) of CTF-B and CTF-N for Co(II) were determined as 50.76 mg g −1 and 60.82 mg g −1 at 303 K. The q max of CTF-B and CTF-N for Sr(II) were 43.12 mg g −1 and 55.89 mg g −1 at 303 K. Thermodynamic analyses indicated that the adsorption process of Co(II) and Sr(II) onto CTF was spontaneous (ΔG < 0) and endothermic (ΔH > 0) and was favored at higher temperature.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
·
IF 3.359
Fuyin Ma,Zheng Li,Haogui Zhao,Yiyun Geng,Wei Zhou,Qingnuan Li,Lan Zhang
As a new carbon-based membrane material used for ionic and molecular sieving, the graphene oxide (GO) membrane also has potential application in radiochemical separation. In this work, the permeation performances of some typical metallic elements in high level-liquid waste (HLLW) through the ionic sieving 5-μm-thick GO membranes were investigated. It was found that the permeation rates of ions through GO membranes markedly decreased with the increase of hydrated ionic radii. Cs(I) and Sr(II) permeated through GO membranes quickly, whereas lanthanide ions and actinide ions infiltrated much more slowly, thus providing the feasibility of separation according to the difference of hydrated ionic radii. Moreover, the concentrations of initial metal ions and acidity in feed solutions also had influences on the permeation of ions through GO membranes, and higher initial metal ions and feed solution acidity were favorable to the removal of Cs(I) and Sr(II). The barrier separation test indicated that GO membranes had promising ability for the separation of Cs(I) and Sr(II) from lanthanide and actinide ions due to the difference of hydrated ion radius, and the separation factor of Cs(I)/U(VI) and Sr(II)/U(VI) would reach about 10 and 3 in single penetration. The presented results demonstrated that the membrane separation based on GO membrane would be a promising candidate for the removal of Cs(I) and Sr(II) from HLLW.
研究领域:
放射化学
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材料科学
·
环境工程
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Kaiyun Li,Shuo Huang,Sheng Zhang,Hongyun Jin
Recently SrY 2 O 4 noteworthy the scientific attention because of its excellent high-temperature structural stability and high thermal expansion coefficient. However, the high thermal conductivity and sintering acceleration limit the application of SrY 2 O 4 in the field of thermal barrier coatings. In this work, Sr(Eu 0.2 Ho 0.2 Er 0.2 Tm 0.2 Yb 0.2 ) 2 O 4 high-entropy ceramic that identified by computational screening was prepared by the solid-state method. The results show that Sr(Eu 0.2 Ho 0.2 Er 0.2 Tm 0.2 Yb 0.2 ) 2 O 4 has high thermal expansion coefficient (11.76×10 −6 K −1 , RT–1500 °C), low thermal conductivity (1.39 W·m −1 K −1 , 1500 °C), and improved fracture toughness (1.94 ± 0.05 MPa⋅m 1/2 ). Particularly, the average grain size increases only from 3.42 μm to 10.68 μm after heat treatment at 1600 °C for 10–100 h, indicating excellent sintering resistance. Density functional theory calculations within heterojunction models further reveals the intrinsic connection between the diffusion ability of the grain boundary atoms and the sintering resistance. This strategy provides new insight for the design of sintering-resistant thermal barrier coating materials.
研究领域:
材料科学
·
计算材料学
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xiaoying Zhang,Fangfei Cai,Funing Ma,Paul Reimus,Linlin Qi,Di Lu,Mohamad Reza Soltanian,Zhenxue Dai
Colloids play a crucial role in influencing the mobility of radionuclides in high-level radioactive waste repositories. However, the co-transport behavior of radionuclides and colloids in geological media remains insufficiently understood. This study investigated the transport of Strontium (Sr) in four types of granite minerals (quartz, biotite , K-feldspar, and plagioclase) in the presence and absence of Na-bentonite colloids (Na-BC) using column experiments. Employing a stepwise modeling strategy, this study first determined the basic flow and transport parameters through breakthrough curve analysis of the conservative tracer (Br). Then, the experimental data of Sr in the colloid-free Sr transport experiments and Na-BC in the Sr-colloid co-transport experiments were quantitatively explained using a two-site sorption model and a two kinetic sites model, respectively. Finally, the co-transport behavior of Sr and Na-BC was fitted using the colloid-facilitated solute transport model. The stepwise modeling allowed quantification of the kinetics of Sr sorption onto mobile and immobile Na-BC and highlighted the role of straining in Na-BC retention. In the absence of Na-BC, Sr transport experienced the greatest retardation in biotite, followed by plagioclase, K-feldspar, and quartz, respectively, which positively correlated with the specific surface area of the minerals. Moreover, Na-BC enhanced Sr transport with the same retardation order in all tested minerals, with recovery rate increments of 68.61%, 19.21%, 6.67%, and 4.33%, respectively. The transport of Sr in K-feldspar was found to be less affected by Na-BC compared to the other tested minerals, likely due to the strong cation exchange capacity of K + among the cation components of minerals, making hydrated K + more likely to exchange with Sr 2+ on K-feldspar surfaces. These findings hold significant implications for assessing the risks associated with the transport of radionuclides in deep geological repositories.
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Catalysts
·
2023
·Vol. 13
·期 2
·450
·
IF 3.9
Muhammad Naeem Younis,Zhiheng Ren,Chunshan Li,Erqiang Wang,Jie Li
The advancing effects of various alkali and alkaline earth metals (inclusive of K, Ca, and Sr) modified Cu/SiO2catalysts, prepared with a modified precipitation-gel method, were investigated for the production of ethanol via hydrogenation of methyl acetate. Our results showed that Sr-doped catalysts exhibited the best and most consistent results during catalytic tests. A series of techniques, including X-ray diffraction technique, Raman spectroscopy, N2adsorption/desorption, N2O titration method, FTIR spectroscopy, and H2temperature, programmed desorption and reduction (TPD and TPR), and X-ray Photoelectron Spectroscopy, which was used to check the detailed characterization of Sr modification in the catalyst and its structural impacts on the properties of the catalyst. These results demonstrated that the addition of 5%Sr could strengthen the intrinsic stability of the catalyst by formulating the appropriate ratio of Cu+/(Cu0+ Cu+) to facilitate catalytic outcome improvement. The addition of 5%Sr-30%Cu/SiO2under the most favorable conditions, resulting in the peak conversion of MA (95%) and ethanol selectivity (96%), indicates its magnificent catalytic stabilizing effects. Furthermore, the best performing catalyst was compared and tested under various conditions (LHSV and temperatures) and a 300 h long life run.Keywords:hydrogenation;methyl acetate;ethanol;strontium
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Jiahao Zheng,Yuyin Yang,Zhaolong Dai,Jingsong Wang,Yulin Xia,Chenxu Li
Strontium ion in radioactive wastewater causes serious harm to the biological and ecological environment, so the removal of strontium ion is of great significance. We have prepared an inorganic adsorption material (MnO 2 /HMSS) by impregnation method. The adsorbent can effectively remove Sr 2+ in radioactive wastewater. The synthetic materials were characterised by X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption isotherms. The effects of the mass ratio of manganese dioxide and hollow mesoporous silica spheres, pH, initial concentration of Sr 2+ , adsorption time, competitive ion and other parameters on the adsorption properties were systematically investigated. The results showed that the 4:1Mn0 2 /HMSS composite had the highest adsorption capacity. The adsorption of Sr 2+ on MnO 2 /HMSS is highly dependent on pH and initial solubility. Furthermore, the adsorption equilibrium is reached at 120 min, with a maximum adsorption capacity of 138.70 mg/g. In addition, the composite still maintains a good adsorption capacity under a variety of competitive ions. The Langmuir and pseudo-second-order models can better fit the adsorption isotherm and kinetic data than the Freundlich and pseudo-first-order models, respectively. The new composite obtained in this work has the advantages of rapid adsorption, large adsorption capacity, strong selectivity and capable of large-scale preparation, which makes it expected to play an important role in the removal of strontium ions.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 2
·1274
·
IF 5.6
Yuanhang Zhao,Hong Zhang,Lihua Hong,Xinying Zou,Jiazhuo Song,Rong Han,Jiawen Chen,Yiyan Yu,Xin Liu,Hong Zhao,Zhimin Zhang
Dental caries, particularly secondary caries, which is the main contributor to dental repair failure, has been the subject of extensive research due to its biofilm-mediated, sugar-driven, multifactorial, and dynamic characteristics. The clinical utility of restorations is improved by cleaning bacteria nearby and remineralizing marginal crevices. In this study, a novel multifunctional dental resin composite (DRC) composed of Sr-N-co-doped titanium dioxide (Sr-N-TiO2) nanoparticles and nano-hydroxyapatite (n-HA) reinforcing fillers with improved antibacterial and mineralization properties is proposed. The experimental results showed that the anatase-phase Sr-N-TiO2nanoparticles were synthesized successfully. After this, the curing depth (CD) of the DRC was measured from 4.36 ± 0.18 mm to 5.10 ± 0.19 mm, which met the clinical treatment needs. The maximum antibacterial rate againstStreptococcus mutans(S. mutans) was 98.96%, showing significant inhibition effects (p< 0.0001), which was experimentally verified to be derived from reactive oxygen species (ROS). Meanwhile, the resin exhibited excellent self-remineralization behavior in an SBF solution, and the molar ratio of Ca/P was close to that of HA. Moreover, the relative growth rate (RGR) of mouse fibroblast L929 indicated a high biocompatibility, with the cytotoxicity level being 0 or I. Therefore, our research provides a suitable approach for improving the antibacterial and mineralization properties of DRCs.Keywords:dental resin composite;dental caries;secondary caries;titanium dioxide;antibacterial property;remineralization
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Chao-Feng Li,Zhu-Yin Chu,Xuan-Ce Wang,Jing-Hui Guo,Simon A Wilde
Thermal ionization mass spectrometry (TIMS) has shown excellent analytical precision for Sr isotopic ratio analysis, even for small masses of material (0.5–10 ng). However, because of the sensitivity limit of TIMS, it is still not possible to obtain high precision 87Sr/86Sr isotope ratios for picogram-level sample sizes (30–100 pg) due to the lack of a highly sensitive emitter. This study is the first to employ a highly sensitive silicotungstic acid emitter to measure Sr isotopes at the picogram-level using TIMS. This emitter produces a 3-fold enhancement in the ionization efficiency of Sr and not only significantly reduces the required sample size but also has good external precision. Analyses of the NIST 987 standard yield an external reproducibility (2 RSD, n = 8) better than ±0.013% even for 30 pg of Sr. It is possible to yield an internal precision (2 RSE) of ±0.003% for 100 pg of sample using the default 1011 Ohm feedback resistors. This method was verified by using a suite of silicate reference materials. Replicate digestions and analyses (n = 8) of the basalt standard BCR-2 (87Sr/86Sr = 0.704998 ± 0.000028, 2 SD) at the 326 ± 30 pg level demonstrates that good external reproducibility is reached on ultratrace level silicate samples. This method has a wide variety of potential applications for samples containing ultralow amounts of Sr in geoscience and archeological studies, such as single grains of mica, sphalerite, and pyrite, single mantle melt inclusions, precious extra-terrestrial materials, and human hair to name just a few.
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Advanced Healthcare Materials
·
2024
·
IF 10
Qing Wang,Ya Gao,Yanzheng Chen,Xuan Wang,Qingguo Pei,Taiyu Zhang,Changping Wang,Jinsong Pan
Bone implant-associated infections and inflammations, primarily caused by bacteria colonization, frequently result in unsuccessful procedures and pose significant health risks to patients. To mitigate these challenges, the development of engineered implants with spatiotemporal regulation capabilities, designed to inhibit bacterial survival and modulate immune responses in the early stage, while promoting bone defect healing in the late stage is proposed. The implants are functionalized with ε-poly-l-lysine-phenylboronic acid (PP) via dynamic boronic ester bonds, which facilitate its release through a reactive oxygen species (ROS) and pH-responsive strategy, thereby establishing an antibacterial microenvironment on and around the implants. Additionally, the dynamic metal coordination interaction facilitates the loading and sustained release of Sr 2+ under an acidic environment, providing immunomodulatory and osteogenic effects. The ROS/pH-responsive feature, coupled with the implant-bone tissue integration process, affords precise spatiotemporal regulation of the Ti-TA-Sr-PP implants. This strategy represents a promising approach for the preparation of advanced bone implants.
研究领域:
生物材料
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组织工程
·
生物医学工程
·
骨科
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