JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·503-513
·
IF 1.947
Zhou Chun Hui,Xia Shu Ting,Komarneni Sridhar,Kabwe Freeman Bwalya,Jin Gui Chen,Chu Mao Quan
Dolomite is an abundant, naturally occurring carbonate mineral, but the conventional processes of converting dolomite to new materials are time-consuming and energy-intensive. In addition, products from dolomite such as magnesium oxide, magnesium carbonate, magnesium hydroxide, which are used as adsorbents and additives, are mostly low value-added. Here, we demonstrated the conversion of dolomite to a mesoporous calcium-magnesium silicate (m-CMS) using a green and efficient continuous-flow synthesis method. The samples were characterized using powder X-ray diffraction, Fourier transformed infrared spectroscopy, N 2 adsorption/desorption isotherms, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy. The material possessed mesoporosity and exhibited high a specific surface area of 629 m 2 /g and a pore volume of 0.66 cm 3 /g. The maximum water absorptivity of the sample was 52.6%. After the m-CMS immersing in Tris–HCl solution for 56 days, the weight loss ratio reached 30 wt%, indicating its good potential biodegradability. Hydroxyapatite was formed on the surfaces after the m-CMS was immersed in simulated body fluids. The m-CSM provided nucleation sites, and subsequently supplied Ca 2+ for hydroxyapatite crystal growth, indicating that the material has potential bone conduction capability. This work suggests that m-CMS can be synthesized from dolomite and tetraethyl orthosilicate through a quick continuous process, and that the m-CMS could be used as a biomaterial.
研究领域:
生物医学工程
·
材料科学
·
生物材料学
·
矿物加工
·
绿色化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 6
·1048-1059
·
IF 3.382
Qun Wang,Tao Yang,Huanhuan Wang,Jianlong Zhang,Xinmin Guo,Zhen Yang,Songtao Lu,Wei Qin
Five methylammonium lead bromide (MAPbBr3) microcrystals with different sizes (∼2.9 mm, ∼2.4 mm, ∼1.9 mm, ∼1.5 mm and ∼1.2 mm), were successfully designed using a facile solvothermal method through tuning the concentration of Pb precursors. The morphology, micro/nanostructure, and chemical composition of these MAPbBr3 crystals are characterized in detail by SEM, XPS, FTIR, PL, TG/DSC, and Hall measurements. The influences of the microstructures involving the defect and grain boundaries on the performance evolution for Li-ion batteries were studied. 3 samples with big, medium, and small sizes (2.9, 1.9 and 1.2 mm) were selected to investigate their electrochemical performance. Interestingly, the MAPbBr3 anodes showed size-dependent electrochemical performance. More importantly, this is the first report stating that excellent cycling stability for 1000 cycles of MAPbBr3 anodes composed of small sized samples should be attributed to the small size, low defect concentration structure and good interface charge transfer.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米结构材料
·
晶体工程
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 90
·期 1
·32-44
·
IF 2.5
Cao Shuqin,Li Yubiao,Wu Xiaoyong,Li Wanqing,Yang Xu
View large Download slide View large Download slide Close modal Developing a feasible and low-cost strategy for the recovery of calcium fluoride efficiently from fluoride-containing wastewater is very essential for the recycle of fluoride resources. Herein, a modified lime precipitation method was employed to recover CaF 2 from fluorinated wastewater using a special icy lime solution. Intriguingly, the highest F – removal was greater than 95% under the optimal condition, leaving a fluoride concentration from 200 to 8.64 mg/L, while the lime dosage was much lower than that of industry. Importantly, spherical-shaped CaF 2 particles with a 93.47% purity and size smaller than 600 nm were recovered, which has a high potential for the production of hydrofluoric acid. Besides, the precipitation was significantly affected by Ca/F molar ratio, stirring time, temperature, and solution pH. Furthermore, the thermodynamics and kinetics were investigated in detail to reveal the crystallization process. As a result, the defluorination reaction followed the pseudo-second order reaction kinetics model. Also, CO 2 in the air adversely influenced the CaF 2 purity. Based on this facile method, a high lime utilization efficiency was applied to defluorination, which contributed to protecting the environment and saving costs. This study, therefore, provides a feasible approach for the green recovery of fluorine resources and has significance for related research. A facile icy lime precipitation method was employed to remove F − . Highly pure spherical particles with CaF 2 of more than 93% were recovered. Thermodynamics implied that CO 2 had an inhibitory effect on the purity of CaF 2 . Change in F fitted well with the pseudo-second order reaction kinetics model. The co-precipitation of CaF 2 and CaCO 3 occurred.
研究领域:
环境工程
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Liu Ting,Yang Guanghua,Ma Juan,Zhang Huimin,Zhang Min,Chang Aimin
The development of negative temperature coefficient (NTC) thermistor materials with a wide range of operating temperatures, high resistance (R), low thermal content (B) and good stability is significant for improving the overall performance of NTC thermistors. Traditional NTC thermistors materials are of the spinel, however, their practical applications are commonly limited to temperatures below approximately 200°C.In this study, it was found that a novel perovskite-structured solid solution (1-x)Bi0.2Sr0.5La0.3TiO3-xLaMnO3 (0.05 ≤ × ≤ 0.2) (BSLT-LM) showed good NTC performance from room temperature to high temperature (600°C) due to the stable structure at high temperatures. The ρ25, ρ100, ρ600 and B25/100, B25/600 constants of Bi0.2Sr0.5La0.3TiO3-0.1LaMnO3 NTC thermistors are approximately 1.76 × 108 Ω cm, 1.13 × 107 Ω cm, 9.89 × 102 Ω cm, 4063.91 K, 5472.34 K, respectively. The electrical conductivity of these solid solution refers to the electronic transition between Mn3+ and Mn4+, and oxygen vacancies. These results demonstrate the tremendous potential of perovskite-structured (1-x) Bi0.3Sr0.5La0.2TiO3-xLaMnO3 thermistor ceramics with NTC performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 8
·2451-2458
·
IF 2.61
Meilu Gong,Fengqi Lu,Xiaojun Kuang,Xiaodi Yu,Quanchao Wang,Xiaohui Li,Liang Fang
Molten salt synthesis (MSS) of the eight-layer hexagonal perovskite Ba 8 NiTa 6 O 24 was performed using mixed KCl–NaCl salts in comparison with solid-state synthesis (SSS). In the SSS, the hexagonal Ba 8 NiTa 6 O 24 formed at 1300°C via a reaction between cubic Ba 3 NiTa 2 O 9 and hexagonal Ba 5 Ta 4 O 15 . While the MSS did not lower the synthesis temperature of the hexagonal Ba 8 NiTa 6 O 24 but stabilized an unusual A- and B-site-deficient cubic perovskite polymorph of Ba 8 NiTa 6 O 24 below 1350°C as an intermediate phase prior to transforming into the hexagonal phase. This cubic polymorph contains ~3% A-site and ~9.5% B-site vacancies plus ~3% Ba cations in the B sites and demonstrated remarkable stability below 1350°C when without presence of the molten salt. The cubic polymorph displayed larger ε ~ 36 and τ f ~ 110 ppm/°C than the hexagonal polymorph from the MSS (ε ~ 29 and τ f ~ 67 ppm/°C). The hexagonal SSS-processed ceramics showed advantageous dielectric properties ( Q f ~ 52 000 GHz, τ f ~ 30 ppm/°C) over both cubic and hexagonal MSS-processed ones ( Q f ~ 18 600–20 000 GHz), while displaying anisotropic grain growth. The anisotropic grain growth was suppressed significantly by the MSS processing.
研究领域:
材料科学
·
陶瓷学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2021
·
IF 3.935
Huilin Song,Xingchen Wang,Siyu Hou,Yuqi Zhang,Xi Luo,Tengfei Li,Shunli Ji
Calcitriol is an active product of vitamin D produced by the liver and kidney hydroxylase metabolism with strong physiological activity. It is the preferred form of medicine for patients with insufficient bone mineralization due to chronic kidney disease. Calcitriol soft capsule is one of the common preparation forms, the main drug content of which is very low (1.55 μg g −1 ), and the pharmaceutical excipients interfere greatly, especially the oily matrix medium-chain triglycerides. Therefore, removing the interference of oily matrix is the main challenge in the content determination. At present, the commonly used sample purification method for the determination of calcitriol in soft capsules is liquid-liquid extraction, but it usually consumes a lot of toxic organic solvents and it is costly. The adoption of SPE purification method, on the one hand, requires specific experimental equipment, and on the other hand, the organic solvent used in the experiment may cause the dissolution of SPE column tube materials, which will interfere with the subsequent detection. Herein, in order to achieve a cost-effective and reliable determination of calcitriol soft capsule content, we developed a dispersive solid-phase (DSPE) extraction method that directly uses irregular silica as sorbent , which is followed by high-performance liquid chromatography equipped with a UV detector(HPLC-UV)analysis. Selective retention of calcitriol is achieved by the polar interaction between calcitriol and silica, what’s more, sufficient contact between washing solvent and sorbent can be guaranteed. Therefore, after pretreatment with DSPE, the interference of oily matrix on detection can be mostly removed and then improve the accuracy of the method compared to the SPE method. Under the optimal conditions of DSPE, calcitriol showed a good linear relationship in the range of 0.15−2.99 μg g −1 , the R 2 was 0.997. Satisfactory recoveries ranging from 101.1%–102.0% for calcitriol were achieved in the oily matrix at the levels of 0.75, 1.50 and 2.24 μg g −1 . And the intra-day and inter-day RSD were less than 2.5 % and 3.2 %. Meanwhile, the LOD and LOQ of calcitriol was 0.01 μg g −1 and 0.02 μg g −1 , which is in full compliance with the regulatory level fixed by the EU, China or other countries. This method was further verified to determine the content of calcitriol in commercial calcitriol soft capsules and the recoveries of three batches of products was 86.2 %–94.4 %. Based on these characteristics, the proposed method makes it possible to determine the low content of weakly polar drugs in the oily matrix in a simple, low-cost and reliable way.
研究领域:
药学
·
分析化学
✓ 已验证
DOI
高影响因子
Inorganics
·
2024
·Vol. 12
·期 6
·157
·
IF 3.1
Chang Liu,Xifeng Fu,Zi-Ang Nan,Zilong Zhang,Lingyi Meng,Peng Gao
Hybrid gold-based perovskite derivatives typically exhibit low optical bandgaps and high optical absorption coefficients, rendering them promising for photovoltaic applications. In this study, we successfully synthesized six new hybrid gold-based perovskite derivatives, namely [(C6H8N2)(AuI4)(AuI2)](3AMPY), [(C6H14N2)(AuI4)(AuI2)](3AMP), [(C8H12N)(AuI4)](2PEAI), [(C4H14N2O)(AuI4)2](OBA), [(C6H18N2O2)3(AuI4)4(I3)2](DDA), and [(C10H26N2O3)(AuI4)(I3)](TOTA), through a straightforward and efficient hydrothermal method, achieving millimeter-sized single crystals. The structural analysis of the single crystals revealed variations in crystal structures arising from differences in constituent units and their spatial positioning relationships. First-principles calculations ascertained their high optical absorption coefficients in the visible light spectrum and indirect bandgap properties. Theoretical models indicated that the spectroscopic limited maximum efficiency (SLME) values of3AMPY, 2PEAI,DDA, andTOTAapproached approximately 30% in films of 0.5 μm thickness, signifying their potential candidacy as solar cell absorbers.
研究领域:
材料科学
·
物理化学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Pengfei Xu,Zhiwei Shen,Baolin Zhang,Jun Wang,Renhua Wu
Superparamagnetic iron oxide nanoparticles (SPIONs) as T2 contrast agents have great potential to sense calcium ion (Ca 2+ ) using magnetic resonance imaging (MRI). Here we prepared calcium-responsive SPIONs for MRI, formed by combining poly(ethylene glycol) (PEG) and polyethylenimine (PEI) coated iron oxide nanoparticle (PEI/PEG-SPIONs) contrast agents with the straightforward calcium-sensing compound EGTA (ethylene glycol tetraacetic acid). EGTA was conjugated onto PEI/PEG-SPIONs using EDC/sulfo-NHS method. EGTA-SPIONs were characterized using TEM, XPS, DSL, TGA and SQUIID. DSL results show that the SPIONs aggregate in the presence of Ca 2+ . MRI analyses indicate that the water proton T2 relaxation rates in HEPES suspensions of the EGTA-SPIONs significantly increase with the calcium concentration because the SPIONs aggregate in the presence of Ca 2+ . The T2 values decreased 25% when Ca 2+ concentration decreased from 1.2 to 0.8 mM. The aggregation of EGTA-SPIONs could be reversed by EDTA. EGTA-SPIONs have potential as smart contrast agents for Ca 2+ -sensitive MRI.
研究领域:
医学影像学
·
纳米医学
·
生物材料学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Ludong Li,Fan Zhang,Shuai Ye,Xiao Peng,Zhenhua Sun,Jiarong Lian,Liwei Liu,Junle Qu,Jun Song
Metal halide perovskites are widely studied in photodetection applications due to their outstanding optical and electrical properties. However, it is still a challenge to develop self-powered perovskite photodetectors with all the characteristics of high photoresponse performance, broad spectral response range, and excellent long-term stability. Herein, we demonstrate the high-performance self-powered photodetectors based on optimized Cs x DMA 1-x PbI 3 (0.7 < x < 1) perovskite films. By adjusting the solution concentration and molar ratio of CsI/DMAPbI 3 in the perovskite precursor, the dark current of devices was decreased significantly by three orders of magnitude and the light current of devices was improved at the same time. Systematic investigations have revealed that the improvement of device performance originates from the reduced bandgap, decreased trap density and increased film thickness of the optimized perovskite films. The optimal self-powered photodetectors display broad spectral response range (300–750 nm), high specific detectivity (>1 × 10 13 Jones), fast response, and excellent long-term stability. These intriguing results indicate that Cs x DMA 1-x PbI 3 perovskite films have tremendous application potential in future self-powered photoelectrical detection technology.
研究领域:
材料科学
·
光电器件
✓ 已验证
DOI
高影响因子
Energy Advances
·
2023
·Vol. 2
·期 10
·1761-1769
·
IF 0
Jingrui Liu,Yimin Xuan,Liang Teng,Chen Sun,Qibin Zhu,Xianglei Liu
The 3rd concentrated solar power technology is considered a potential strategy to solve the energy shortage and achieve carbon neutrality in which the development of long-stable energy storage materials is the key to overcoming the intermittency and instability of solar power. Therefore, we present a calcium-based particle with a thermal expansion compensation strategy that enables high energy densities and long storage times. High measured energy densities of up to 1554 kJ kg−1, long storage lifetimes of up to 260 cycles, and high spectral absorption of up to 90.8% are demonstrated in negative thermal expansion NdMnO3/inert Al–Fe alkali metal element couples incorporated into calcium oxide structures. A set of evaluation indexes to quantitatively evaluate long-cycle heat storage performance is proposed. Based on the phenomenon that the thermal contraction of the NdMnO3 lattice distortion counteracts the acidification volume expansion of calcium oxide, the thermal expansion compensation effect is proposed for the first time. This effect excellently ameliorates the problem of sintering and agglomeration and improves the recycling rate of calcium oxide from the perspective of microscopic thermal regulation. A new conceptual scheme is provided on long-storage-life solar thermochemical energy storage and continuous CO2 capture technology.
研究领域:
材料科学
·
可再生能源
·
热力学
✓ 已验证
DOI
iScience
·
2023
·
IF 5.8
Yuming Hu,Tingqing Wu,Jiabing Zhang,Wei Sun,Mengfei Lv,Hongfei Xie,Tangyue Xue,Teng Han,Chunbao Li,Meng Su,Yanlin Song
Reliable monitoring the movement amplitude and dynamics during sports exercise is significant for improving training results and preventing training wound. Here, we present a printed perovskite-based photodetector for real-time and quantitative monitoring of sports motion. The ordered nucleation and growth of perovskite crystals are regulated by the 4-acetamidothiophenol (AMTP) at the interface, which promotes the size of perovskite crystals into the micrometer. Benefiting from the uniformity of the AMTP-regulated MAPbI 3 , the as-prepared photodetector gives great photocurrent response under indoor light or outdoor light. During the exercise, real-time monitoring sports motion is achieved through detecting the illumination changing of photodetectors attaching on the wrist and ankles. Moreover, twelve kinds of common sports can be quantitatively analyzed with the detection of illumination changing on the photodetector. Such photodetector provides an efficient measurement method of wearable electronics for sports monitoring.
研究领域:
材料科学
·
生物医学工程
·
运动科学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2021
·
IF 0
Ming Shi,Hongpeng Zhou,Wenming Tian,Bin Yang,Songqiu Yang,Keli Han,Rengui Li,Can Li
Although bismuth (Bi)-based halide perovskites have attracted profound attention in photocatalysis, the undesirable photophysical properties are not well modulated, and the effect of surface structure on adsorption and activation of reactant molecules is still unclear. Here, we report the structural design, via precise incorporation of antimony (Sb) atoms into the host lattice of Cs 3 Bi 2 Br 9 , of a series of B-site bimetallic perovskites (Cs 3 Sb x Bi 2-x Br 9 , 0 ≤ x ≤ 2) with tunable band structures. The incorporation of Sb dramatically enhances the separation and transfer of photogenerated charges and prolongs their lifetimes. Considering these advantages, Cs 3 SbBiBr 9 exhibits significantly enhanced photocatalytic activities in challenging benzylic C–H activation while maintaining a high selectivity of 96%. Theoretical calculations reveal that the introduction of Sb breaks the symmetry of the local structure and leads to asymmetric charge distribution that not only increases the adsorption capacity for methylbenzene but also reduces the energy barriers for C–H bond activation.
研究领域:
材料科学
·
光化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）