CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Lijun Yang,Dongxue Wu,Jun Tang,Yawei Hao,Jingchuan Wang,Xiaochong Zhao,Pan Yang
A simple and environment friendly method for the synthesization of CH 3 NH 3 BF 4 , which exhibits high purity and yield. With close ionic radius, BF 4 − was doped into CH 3 NH 3 PbBr 3 perovskite as substitution of Br − to improve the chemical stability of lead halide perovskite. The results show that the doped-BF 4 − can increase the charge carrier lifetime of CH 3 NH 3 PbBr x (BF 4 ) (3-x) perovskite thin films, meanwhile decrease the rate of recombination. This is mainly due to the larger ionic radius of BF 4 − , which brings about a lower degree X-ray diffraction angle shift, wider ultraviolet visible spectrophotometer absorbance band, red-shift photoluminescence emission peak, and longer fluorescence lifetime.
研究领域:
材料科学
·
化学
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高影响因子
Science China-Chemistry
·
2023
·Vol. 66
·期 4
·1073-1077
·
IF 9.6
Pei Huan,Wang Xuefei,Zhang Jie,Zhang Fangfang,Yang Zhihua,Pan Shilie
Fluorooxoborate has emerged as a promising system for exploring optical materials due to their rich structural chemistry and physicochemical properties, yet so far not fully studied. Herein, we report a new fluorooxoborate, Ba 2 B 9 O 13 F 4 ·BF 4 , which contains the greatest variety of structural basic units, [BO 3 ], [BO 2 F 2 ], [BO 3 F], and [BF 4 ], and exhibits unprecedented 1D infinite [B 18 O 26 F 8 ] tubes. The unique structure avoids the dangling bonds caused by terminal oxygens, which is beneficial to the large bandgap and deep-ultraviolet cutoff edge. This article expands the crystal structure of fluorooxoborates and contributes to the exploration of deep-ultraviolet optical materials in fluorooxoborate systems.
研究领域:
无机化学
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材料科学
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光学材料
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晶体学
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高影响因子
INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2026
·Vol. 47
·期 4
·60
·
IF 3.6
Aljasmi Abdullah,Mohammad Abubaker A.,AlJimaz Adel S.,AlKhaldi Khaled H. A. E.,AlTuwaim Mohammad S.
Density, refractive index, viscosity, surface tension, and speed of sound were experimentally determined and analyzed for [C 2 mim][MeSO 4 ], [C 2 mim][EtSO 4 ], [C 2 eim][EtSO 4 ], [C 4 mpy][BF 4 ] and [C n py][BF 4 ] ( n = 3, 4, 6) at atmospheric pressure and temperatures ranging from 293.15 K to 343.15 K. Expectedly, temperature exhibited the greatest impact on viscosity, as all properties decrease as temperatures increase. Linear temperature-dependent correlations were utilized for density, surface tension, refractive index, and speed of sound, while the Vogel–Fulcher–Tammann (VFT) model was applied to describe the temperature dependence of viscosity. The Laplace-Newton equation was used to calculate isentropic compressibility, and thermal expansion was calculated using the experimental density data. Furthermore, the study examined the impact of anion type and alkyl chain length on the thermophysical properties of the ionic liquids. The results reveal that the physical properties of the ionic liquids are significantly influenced by the anion type, whereas the alkyl chain length has a less significant impact. Density, speed of sound, and surface tension decrease as the length of the alkyl chain increases, while viscosity and refractive index exhibit opposing trends. Additionally, the experimental data obtained in this study is compared to theoretical models for density, surface tension, and speed of sound.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2010
·
IF 1.695
Li Jing,Zheng Danxing,Fan Lihua,Wu Xianghong,Dong Li
The aim of this work is to investigate improving the effects for adding ionic liquids (ILs) to the working fluids of absorption cycle, lithium bromide aqueous solution (H2O + LiBr), and lithium chloride aqueous solution (H2O + LiCl). 1,3-Dimethylimidazolium chloride ([Dmim]Cl) and 1,3-dimethylimidazolium tetrafluoroborate ([Dmim]BF4) were selected to be additives. The vapor pressure data were measured for the H2O + LiBr + [Dmim]Cl system (LiBr/[Dmim]Cl mass ratio = 3), H2O + LiBr + [Dmim]BF4 system (LiBr/[Dmim]BF4 mass ratio = 2), H2O + LiCl + [Dmim]Cl system (LiCl/[Dmim]Cl mass ratio = 2), and H2O + LiCl + [Dmim]BF4 system (LiCl/[Dmim]BF4 mass ratio = 2) by means of the boiling point method, at temperatures from (303.60 to 439.42) K and the mass fraction of absorbent species from 0.20 to 0.70, respectively. The Antoine-type equation was used to correlate the experimental data of the ternary systems, and the agreements with the experimental data were excellent; that is, the average absolute relative deviations (ARDs) for pressure between experimental and calculated values were 1.05 %, 0.75 %, 0.63 %, and 0.92 % for the systems. Compared with traditional working fluids of absorption cycle, H2O + LiBr and H2O + LiCl, the promising results show that four ternary systems investigated in this work might be used as alternative working fluids to improve the performances of absorption cycles and liquid desiccant dehumidification systems.
研究领域:
热力学
·
制冷与空调
·
化学工程
·
离子液体应用
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高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Jing Xie,Lin Li,Jianlei Qi,Xuehai Wang,Haocheng Sun,Jianzhong Yin
The chemical recycling of polyethylene terephthalate (PET) faces challenges such as low depolymerization efficiency, harsh reaction conditions, and low product selectivity. In this study, 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) ionic liquid (IL) was developed as a catalyst for methanolysis, achieving the efficient conversion of PET into the target monomer dimethyl terephthalate (DMT). The effects of temperature, time, IL amount, and methanol quantity on the reaction were systematically investigated. The degree of depolymerization and catalyst stability were systematically evaluated by multiscale characterization (spectroscopy, chromatography, thermal analysis, etc.). Experimental results indicated that when the PET/[Bmim]BF 4 ratio was 6:1 and the PET/methanol ratio was 1:6 (mass ratio), reaction at 200°C for 2 h, PET was completely converted (100%), and the yield of DMT reached 82.26%. [Bmim]BF 4 could be reused more than five times without significant decrease in PET conversion. The kinetic results showed that the reaction was in line with the first-order kinetic model, and the apparent activation energy was about 43.24 kJ/mol. DFT calculations suggested that [Bmim]BF 4 efficiently catalyzed the reaction by lowering the energy barrier of the key transition state. This study provides a solution with both high efficiency and industrial potential for the green chemical recycling of PET. Graphical The methanolysis of polyethylene terephthalate (PET) was catalyzed by 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) at 200°C for 2 h, achieving PET conversion (100%) and 82% yield of dimethyl terephthalate (DMT).
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Tong Su,Meiqiao Wei,Hanqing Liu,Yunshan Fang,Qiong Wu,Zhehui Weng,Jie Ling,Renjie Chen,Yulan Wang,Xiusha Zhao,Haidong Ju
Two new purely inorganic cationic tellurite networks of Group IB metal-based tetrafluoroborates, namely, [Cu2F(Te2O5)](BF4), 1, and [Ag18O2(Te4O9)4(Te3O8)(BF4)2]·2HBF4, 2, have been hydrothermally synthesized under mild conditions. The prepared materials have been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, IR and Raman spectroscopy, SEM–energy-dispersive spectroscopy, UV–vis–NIR diffuse reflectance, magnetic study, and TG analyses. Single-crystal diffraction studies show that both materials have similar cationic Cu/Ag tellurite layers with tetrafluoroborates as interlamellar charge-balancing anions. Magnetic results indicate that [Cu2F(Te2O5)](BF4), 1, exhibits a mainly short-range antiferromagnetic ordering within the 2D layer, and further detailed analysis of magnetic susceptibility analysis confirms a spin-singlet ground state with an energy gap of 85 K.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2018
·
IF 3.886
Shichao Feng,Yuanyuan Wu,Jianquan Luo,Yinhua Wan
In this paper, AgBF 4 /[emim][BF 4 ] supported ionic liquid membranes (SILMs) were prepared successfully for CO/N 2 separation using nitrogen pressure immobilization procedures. The incorporation of AgBF 4 could decrease membrane weight loss, improve the pressure-resistant ability, and keep the critical pressure (0.45 MPa) of the SILMs. The high viscosity and undissolved AgBF 4 solids in membrane liquid would disturb gas molecular transport through membrane and give rise to the gas transport resistance. Therefore, the gas permeability decreased remarkably with increasing AgBF 4 carrier content in the membrane. When the molar ratio of AgBF 4 to [emim][BF 4 ] increased from 0:1 to 0.3:1, the CO/N 2 selectivity of the SILMs showed a great increase from ∼1 to ∼9 at 20 °C and 0.4 MPa, suggesting that AgBF 4 was an effective carrier for CO facilitated transport. The permeabilities of N 2 and CO increased at higher transmembrane pressure, indicating that molecular transport would dominate the transport process at high pressure. The temperature-dependent gas permeability followed the Arrhenius equation. Moreover, the differences between the activation energies of CO and N 2 became larger after introducing AgBF 4 , resulting in more obvious decrease in the CO/N 2 selectivity at higher operating temperature.
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RSC Advances
·
2018
·Vol. 8
·期 4
·1987-1992
·
IF 2.936
Mei Wang,Mingming Wang,Na Rao,Jiale Li,Jianfen Li
Alcohol amine solutions have a high absorption capacity and rate for CO2 capture, however, there are some shortcomings such as high energy-consumption and low stability. To enhance CO2 capture performance of aqueous MEA, a functional ionic liquid ([NH2e-mim][BF4]) was introduced based on the advantages for CO2 capture. Absorbents were prepared with the molar concentration ratio of [NH2e-mim][BF4] to the 30 vol% aqueous MEA of 0 : 10, 1 : 9, 2 : 8, 3 : 7, 4 : 6 and 6 : 4. The density and the viscosity of the investigated absorbents were measured and the effects of the molar fraction of [NH2e-mim][BF4] (nI) and temperature on CO2 absorption performance were investigated. CO2 desorption performance of the solvent at different temperatures was discussed. The stability performance of the absorbent with nI of 2 : 8 (I/M2:8) was examined by five consecutive cyclic tests. The results showed that for pure CO2, the I/M2:8 displayed the highest absorption performance at 303 K under 1 bar: a comparable CO2 absorption capacity of the 30 vol% aqueous MEA and a higher CO2 absorption rate at the later absorption stage. Moreover, with the increase of temperature, CO2 absorption capacity and rate decreased, while CO2 desorption efficiency and rate increased. 393 K was chosen as the optimum desorption temperature with the desorption efficiency of 99.31%. The introducing of IL contributed to CO2 desorption performance of the absorbents significantly. The properties (CO2 absorption capacity, mass loss, density and viscosity) of the I/M2:8 during the cycles suggested that the IL-MEA mixture had an excellent stability performance.
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PubMed
高影响因子
Micromachines
·
2021
·Vol. 12
·期 12
·1461
·
IF 2.891
Chenyu Xiong,Yun Hui,Ri Wang,Chao Bian,Yuhao Xu,Yong Xie,Mingjie Han,Shanhong Xia
Trace mercury ion (Hg2+) detection is important for environmental monitoring and water safety. In this work, we study the electrochemical strategy to detect trace Hg2+based on the preconcentration of temperature-controlled N-octylpyridinium tetrafluoroborate ([OPy][BF4]) dispersive liquid–liquid microextraction. The [OPy][BF4] selectively extracted Hg2+from aqueous solution by the adsorption of unsaturated N in [OPy][BF4], which increased the concentration of Hg2+and decreased that of other interference ions. It was noted that the adsorption of [OPy][BF4] to Hg2+was weakened by aqueous solution. Hence, after extraction, precipitated [OPy][BF4] was diluted by a buffer solution comprising a mixture of water and acetonitrile to release Hg2+and the single was detected by electrochemistry. Water is proposed to release Hg2+adsorbed by [OPy][BF4], and the acetonitrile serves as a co-solvent in buffer solution. Sensitivity and anti-inference ability of sensors were improved using the proposed method and Hg2+releasing procedure. The detection limit (S/N = 3) of the sensor is 0.0315μg/L with a linear range from 0.1 to 1μg/L. And the sensor exhibits good recovery with an range from 106 % to 118%, which has great potential for trace Hg2+determination.Keywords:mercury ions detection;electrochemical sensor;ionic liquid;liquid–liquid extraction
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1476
·
IF 4.2
Haixia Xie,Lei Li,Jiawei Zhang,Yihao Zhang,Yong Pan,Jie Xu,Xingtian Yin,Wenxiu Que
With the rapid progress in a power conversion efficiency reaching up to 26.1%, which is among the highest efficiency for single-junction solar cells, organic–inorganic hybrid perovskite solar cells have become a research focus in photovoltaic technology all over the world, while the instability of these perovskite solar cells, due to the decomposition of its unstable organic components, has restricted the development of all-inorganic perovskite solar cells. In recent years, Br-mixed halogen all-inorganic perovskites (CsPbI3−xBrx) have aroused great interests due to their ability to balance the band gap and phase stability of pure CsPbX3. However, the photoinduced phase segregation in lead mixed halide perovskites is still a big burden on their practical industrial production and commercialization. Here, we demonstrate inhibited photoinduced phase segregation all-inorganic CsPbI1.2Br1.8 films and their corresponding perovskite solar cells by incorporating a 1-butyl-1-methylpiperidinium tetrafluoroborate ([BMP]+[BF4]−) compound into the CsPbI1.2Br1.8 films. Then, its effect on the perovskite films and the corresponding hole transport layer-free CsPbI1.2Br1.8 solar cells with carbon electrodes under light is investigated. With a prolonged time added to the reduced phase segregation terminal, this additive shows an inhibitory effect on the photoinduced phase segregation phenomenon for perovskite films and devices with enhanced cell efficiency. Our study reveals an efficient and simple route that suppresses photoinduced phase segregation in cesium lead mixed halide perovskite solar cells with enhanced efficiency.
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高影响因子
Journal of the American Chemical Society
·
2014
·
IF 11.444
Heng-Yun Ye,Shen-Hui Li,Yi Zhang,Lei Zhou,Feng Deng,Ren-Gen Xiong
Many order–disorder-type phase transitions in molecule-based ferroelectrics are related to changes of molecular dynamics. If the molecular motions do not involve reorientations of dipole moments, their ordering fails to contribute directly to spontaneous electric polarization. For understanding ferroelectric mechanisms in these systems, it is important to clarify how such molecular dynamics changes induce structurally symmetry-breaking phase transitions and thus the appearance of spontaneous electric polarization. Systematic characterization of an [18]crown-6 based host–guest inclusion compound, [(DIPA)([18]crown-6)]BF4 (DIPA = 2,6-diisopropylanilinium), shows it is an excellent ferroelectric with a large dielectric anomaly, significant pyroelectricity, and SHG response, and rectangular polarizaiton–electric field hysterisis loops. By the combination of variable-temperature single-crystal structural determination and solid-state NMR observation, it is found that the slowing down of the rotation of the [18]crown-6 molecule and the tumbling of the BF4 anion causes the symmetry breaking, while the spontaneous polarization is induced by the relative displacement between the cationic and anionic sublattices. This investigation will contribute to a deeper understanding of the structure–property relationship in the emerging molecular ferroelectrics.
研究领域:
材料科学
·
物理化学
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PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 1
·016437
·
IF 1.929
Linchen Liao,Caifeng Chen,Jilong Qian,Youming Zhang,Ruifang Zhang,Jiaguang Zhu
PVDF/IL piezoelectric film based on [Emim]BF4-added was prepared by near electric field direct writing. The β-phase content and its electric property of the film were analyzed. The results showed that the content of β crystal phase of PVDF film was improved by the synergistic effect of IL ([Emim]BF4) and near electric field. When the amount of [Emim]BF4 added was 1.5 wt%, the relative β-phase content of PVDF film reached 85.09%, and the crystallinity is 47.84%. Increase in [Emim]BF4 content resulted in a significant increase in the relative dielectric constant of the film, from 6 to 285, but also accompanied by a sharp increase in dielectric loss. The d33 value of the film can be as high as −10 pC/N, and the output voltage from the cantilever beam vibration feedback indicates that the voltage strength of the [Emim]BF4-added film is greatly improved compared with the pure PVDF film.
研究领域:
材料科学
·
物理学
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高影响因子
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