COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Yun-fei Zhang,Rui Zhang,Chao-long Yang,Jing Xu,Jian Zheng,Man-geng Lu
Stable acrylate/triethoxyvinylsilane (VTES) core–shell emulsion with different mass ratio of MMA/BA in the core and shell was prepared via a modified micro-emulsion polymerization process. The chemical composition and core–shell structure were investigated by Fourier transform infrared (FTIR) spectrometry, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. Effect of MMA/BA mass ratio in the core and shell on the film-forming ability, surface tension of latex was also studied. Finally, water absorption and thermal stability of the latex films were characterized. It was found that the surface tension of emulsion can be reduced to 32.9 N/m when the MMA/BA mass ratio in the shell is 6/4. The water absorption of the latex film could be improved at a proper mass ratio of MMA/BA in core and shell, but adjusting the mass ratio of MMA/BA in the shell has little influence on the thermal stability of latex film. This work provides a method of preparing environment-friendly latex with low surface tension and excellent water resistance for coating applications by regulating the mass ratio of monomers in a modified micro-emulsion polymerization process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·6577-6585
·
IF 3.9
Yuting Zhang,Huan Tu,Guoying Zhao,Jingshan Hou,Yufeng Liu,Xin Qiao,Zhongzhi Wang,Bo Li,Ji-Guang Li,Feng Wang,Yongzheng Fang
Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and renders precisely controllable emissions due to the abundant lattice control positions. In this work, we regulate the coordination field of Ce 3+ ion based on the co-substitution method and achieve the spectra regulation in the yellow–green range. We used Ba 2+ –Si 4+ cations to replace Y 3+ –Al 3+ cations in Y 3 Al 5 O 12 (YAG) matrix to obtain blue-shift of the emission peak from 552 to 539 nm. The centroid shift and crystal field splitting decrease with the decreasing covalency of the bond between the Ce 3+ ion and the surrounding anions owing to the higher electronegativity of Si 4+ ions than Al 3+ ions. The corresponding fluorescent films were prepared by a low-temperature co-sintering process based on the as-made Ba 2+ –Si 4+ co-substituted phosphor. X-ray powder diffractometer and scanning electron microscopy images showed that the fluorescence crystals were less eroded and evenly dispersed in the glass matrix. Spectral analysis showed that the garnet phase was protected by using lead-free borosilicate glass with a low melting point, and the quantum efficiency of phosphor-in-glass (PiG) retains 98% of the corresponding phosphor. By adjusting the ratio of garnet phosphor to commercial red nitride phosphors, a warm white fluorescence with a color rendering index of 80.3 and color temperature of 3899 K was obtained. The prepared warm white film has potential application value in the whole spectra field.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
·
晶体场理论
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Zijing Wang,Changjuan Mo,Sixuan Xu,Shanshuai Chen,Tiansheng Deng,Wanbin Zhu,Hongliang Wang
The catalytic conversion of carbohydrate to platform chemicals, e.g. lactic acid (LA), is the key to unlock the potential of biomass. In this study, we report that the combination of Ba(OH) 2 and Ca(OH) 2 can efficiently catalyse high-concentration (> 0.5 M) of glucose to relatively high yield of LA (> 40 %) under mild conditions (60 °C). Both glucose conversion and LA yield were sensitive to the pH of the catalytic system. A high loading of Ba(OH) 2 led to a high initial pH of the reaction solution, resulting in serious side reactions. While, a low loading of Ba(OH) 2 led to a quike decrease of OH − and Ba 2+ both of which were continuously consumpted by the formed LA. The combination of Ca(OH) 2 with Ba(OH) 2 could significantly improve LA yield, since Ca(OH) 2 , with limited solubility, could act as a controlled-release catalyst for the real-time supply of OH − and Ca 2+ . OH − was indispensable for glucose isomerization to fructose as well as for fructose retro-aldol reaction to C 3 intermediates. Ca 2+ could combine with LA to form stable calcium lactate, liberating Ba 2+ to catalyse the conversion of C 3 intermediates to LA. Under the preliminary optimized reaction conditions, the yield of LA could be reached to 42.55 % and 38.32 % from 0.5 M and 1 M glucose, respectively. This catalytic system has advantages of mild reaction condition, short reaction time, and capable of conversion of high-concentration substrates, enabling it with a great potential for practical applications.
研究领域:
生物化学
·
可再生资源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Abdul Latif,Ahsan Maqbool,Runzhan Zhou,Muhammad Arsalan,Kai Sun,Youbin Si
This study represents one of the first attempts towards bisphenol A (BPA) degradation by Trametes versicolor laccase immobilized on Ba-alginate beads. The effect of input variables including temperature (20–40 °C), BPA concentration (2–10 mg/L) and time (10–90 min) were studied using Box-Behnken design (BBD) and artificial neural network (ANN). The maximum BPA degradation of 84.34% was obtained when the temperature was 40 °C, BPA concentration 2 mg/L and time 50 min, which was accurately predicted by BBD (83.48%) and ANN (84.33%), proving the accuracy of prediction for both models. The values of R 2 and MSE for BBD were found to be 0.98, 9.88, while for ANN were 0.97, 38.25, respectively. Based on higher R 2 value and lower MSE, BBD was slightly better than ANN. The immobilized laccase showed higher storage stability than free laccase by retaining 68.64% and 44.62% of their activity at the same experimental conditions. Furthermore, BPA transformation was confirmed by Fourier-transform infrared spectroscopy (FTIR) analysis. GC-MS had detected the oxidative degradation products from BPA. Results showed that Ba-alginate immobilized laccase could be a promising biocatalyst in treating organic pollutants .
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Jie Jiang,Wen-Jun Wang,Bo-Geng Li,Shiping Zhu
The tactics of targeting copolymer composition (CC) and molecular weight (MW) via semibatch controlled radical polymerization (CRP) have been extensively studied. However, little effort is made to target copolymer sequence length (CSL) and its triad sequence, which are among the key microstructures determining material properties of the copolymers. This work presents a method to design and synthesize targeted CSL and copolymer triads in a reversible addition–fragmentation chain transfer radical mini-emulsion copolymerization system (RAFT) through a semibatch chain and sequence model coupled with Alfrey Mayo model. The kinetic model was first derived and correlated with experimental results of the batch St/BA copolymerizations. The semibatch RAFT model was then employed to calculate the feed-rate to target CSL and their triads. St/BA copolymers with different uniform CSLs and their triads are synthesized through the programmed semibatch RAFT mini-emulsion copolymerization processes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Planetary Science Journal
·
2025
·Vol. 6
·期 3
·55
·
IF 4.3
Erbin Shi,Xiaojia Zeng,Jian Chen,Enming Ju,Zongcheng Ling
Calcium sulfates are widely distributed in Gale crater and Endeavour crater on Mars. However, the mole ratios of Ca2+ and SO3 in some Sr–Ba-rich sulfate veins are less than 1. This indicates that there may be additional solid solution phases on Mars, including Ca–Sr, Ba–Sr, and Ca–Ba sulfates, which, on Earth, are typically found in marine environments. In this study, we synthesized a series of Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solutions in the laboratory. These synthesized solid solutions were then characterized using various techniques, including X-ray powder diffraction (XRD), Raman, mid-infrared, and visible and near-infrared. Our results show that the XRD and Raman spectra of Ca–Sr and Ba–Sr sulfates varied with their cation contents. In particular, the linear relationships (R2 ≥ 0.98) between the mole ratios of cation ions and peak positions of {{\rm{SO}}}_{4}^{2{-}} tetrahedron (v1) in Raman spectra were obtained. The mole content of Ca2+, Sr2+, and Ba2+ can be precisely constrained in Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solution phases through linear relationships, respectively. These results are the experimental basis for analyzing in situ detection data (e.g., SHERLOC, SuperCam, and Oxia planum) and can be used to precisely constrain the mineral phases of calcium sulfate veins on Mars.
研究领域:
地质学
·
行星科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenjuan Shang,Hui Xin,Xiandeng Hou,Li Wu,Lan Wu
In this work, a boric-acid-modified Fe3O4@Au@BA-MOF composite material as a multifunctional SERS substrate was ingeniously constructed for detecting both pathogens and antibiotics as well as photothermally inactivating the pathogens. Through improving the dispersity and stability of gold nanoparticles (Au NPs), leveraging the specificity of boric acid (BA) groups in recognizing cis-diol structures, and the ability of SERS technology to provide unique fingerprint spectra of targets, the sensitive and stable detection of pathogens and antibiotics was achieved. Compared with Au NPs and Fe3O4@Au, the SERS enhancement factor of Fe3O4@Au@BA-MOF was 4.31 × 106, which was about 400 times and 16 times higher than the former two, respectively. Among the existing work, the limit of detection for pathogens was lower or comparable, and it exhibited good stability, maintaining consistent performance for 23 days. Additionally, this substrate achieved efficient photothermal inactivation of pathogens under both near-infrared light and natural light excitation. Within 8 min of near-infrared light irradiation, the bactericidal rates for Staphylococcus aureus and Escherichia coli reach 100% and 99.3%, respectively.
研究领域:
分析化学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaohui Zhang,Xiaohua Zhang,Shuai Ma,Xingyuan Qi,Zhenxing Yue
The layered perovskite Ca 1- x Ba x La 4 Ti 5 O 17 ( x = 0.2, 0.4, 0.6, 0.8) compounds were synthesized via the solid-state reaction method, and their phase composition, microstructure and microwave dielectric properties were investigated. X-ray diffraction (XRD), Raman spectroscopy and selected area electron diffraction (SAED) patterns confirmed that it appears as a single phase with orthorhombic perovskite structure belonging to the Pnnm space group when x = 0.2. The crystal structure analysis and high-resolution transmission electron microscope (HRTEM) results showed that the compound has a layered structure composed of 5 unit [TiO 6 ] layers tightly packed (A n B n O 3 n +2 , n = 5). The Q×f value of ceramics was gradually improved with the increase of Ba 2+ content, which was attributed to the production of the second phase BaLa 2 Ti 3 O 10 , but it also caused the deviation of the temperature coefficient of resonant frequency (τ f ). For the ceramic specimen of x = 0.2, excellent microwave dielectric properties were obtained with an optimal combination ( ε r = 57.2, Q×f = 12,100 GHz, and τ f = 0.67 ppm/°C). Ba-modified CaLa 4 Ti 5 O 17 ceramics with comprehensive and excellent performance provides support for miniaturized microwave device applications.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weixia Lv,Caijian Zhu,Jun Chen,Caixia Ou,Qian Zhang,Shengwen Zhong
In this work, the solvent and lithium salt are modified simultaneously to improve the low temperature performance of the electrolyte. The butyl acrylate (BA) with low melting point and high dielectric constant is combined with the ethylene carbonate (EC) with high dielectric constant and excellent film-forming property, which used as mixed additives. On the other hand, the LiBF 4 with small ion size and large ion mobility is chose to mixed with LiPF 6 with best comprehensive performance, which are used as mixed lithium salts. The BA + EC + LBF mixed additives improves the solubility, conductivity and melting point of the electrolyte, and effectively improves the composition, thickness and uniformity of the CEI film, which together increased the capacity and voltage platform of the batteries at low temperatures. The discharge capacities of BA16%+EC10%+0.3 M LBF battery at −10, −20, −30 and −40 °C are 173.1, 156.0, 147.0, and 119.3 mAh/g respectively, which are much higher than the batteries with the electrolyte without adding additives (122.0, 107.8, 95.7, and 74.3 mAh/g respectively). Furthermore, BA + EC + LBF can form a porous and thin LiF CEI film on the cathode surface, which is very favorable for transport of Li + , further improve the behaviors of the batteries at different low temperatures. Even in the case of charging and discharging at −40 °C, its discharge capacity can be stably maintained at 85 mAh/g. The BA + EC + LBF mixed additives used in this work as an effective strategy to improve the comprehensive behaviors of the battery at low temperatures, which would provide a new insight to design high performance of low temperature electrolyte.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2024
·
IF 0.6
Li Suwen,Gao Jinyu,Shen Hongzhi,Guan Cong,Yue Jinying
CaF2: Eu3+ nanoparticles with different doping concentrations were prepared by a hydrothermal method. The surface of the prepared nanoparticles was modified by 1,2,4,5-benzenetetracarboxylic acid. The structure, morphology, photoluminescence properties, and fluorescence dynamics are studied systemically. The functionalized nanoparticles have a broad excitation band in UV-vis area and high asymmetry radio. The luminescence of Eu3+ ions in CaF2 nanoparticles is improved by 1,2,4,5-benzenetetracarboxylic acid bonded onto the surface of nanoparticles via the energy transfer process. The excited state lifetimes of functionalized nanoparticles are longer than those of un-functionalized nanoparticles. These kinds of materials have the potential to be applied in luminescent solar concentrators.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wen Cui,Lvcun Chen,Jieyuan Li,Ying Zhou,Yanjuan Sun,Guangming Jiang,S.C. Lee,Fan Dong
Semiconductor-based photocatalysis has attracted considerable interdisciplinary attention for its diverse applications in environmental remediation and solar energy conversion. However, pure earth-abundant insulators have been seldom considered as photocatalysts because of the unfeasible electronic excitation. In this work, we make the earth-abundant insulator BaSO 4 as conceptually new photocatalyst via Ba-vacancy engineering for the first time. The BaSO 4 with Ba-vacancy is synthesized by a facile precipitation method and applied for photocatalytic NO removal in air. XAFS spectroscopy and DFT calculations demonstrate the formation of Ba-vacancy. Also, defect level induced by Ba-vacancy between the wide band gap is demonstrated, which endows insulator BaSO 4 with semiconductor-like photocatalytic performance. Besides, according to the TPD analysis and theoretical simulation, Ba species is functioned as the NOx storage center for the primary accumulation of NO molecule on substrate, and simultaneously Ba-vacancy is equipped with the capability to redistribute charge carriers and thus accelerate the activation of NO molecule by the donation of electrons to electron-deficient areas, facilitating the conversion of NO into a higher valance state for further favorable photocatalytic oxidation. In situ DRIFTS spectra are applied to dynamically monitor intermediates and products on photocatalyst surface, revealing the reaction process and the enhancement role of Ba-vacancy. This work opens a new research doorway on earth-abundant insulators for the development of a new family of photocatalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2022
·Vol. 38
·期 2
·449-456
·
IF 4.351
Wengang Liu,Yuchen An,Qinyuan Qu,Pengfei Li,Lixin Zhang,Chaofeng Li,Shuang Wei,Hongying Zhou,Jiubin Chen
Barium (Ba) is a major element in many geological samples (e.g. barite/witherite-rich samples) and introduces serious oxide and hydroxide interferences during the analysis of rare earth elements (REEs) by ICP-MS. Hence, eliminating Ba interference is an indispensable step for accurate ICP-MS analysis of REEs. Though ion-exchange chromatography is widely used for REE purification, the tediousness, time consumption and high cost limit the application of this purification method. In this study, we developed a rapid and reliable separation method to eliminate Ba from geological samples for the precise measurement of REEs by ICP-MS. The new method was established based on the difference in solubility between Ba and REEs in concentrated nitric acid as barium nitrate (Ba(NO3)2) is almost insoluble, in contrast to REEs. The whole separation procedure could be completed in less than two hours and only consumed 1.5 mL 15 M nitric acid. The protocol resulted in acceptable procedural blanks (below 0.02 ng mL−1), quantitative recovery (96–103%) of REEs, and limited Ba content (0.37 ± 0.14 μg mL−1, (2SD, n = 50)) in the purified solution (50 mL), in which the interference effect could be eventually eliminated by mathematical correction during the ICP-MS analysis. The method was successfully applied to four natural barite-rich samples with BaSO4 content ranging from 18.87 wt% to 42.41 wt%. Overall, this accurate and rapid method shows great potential for the precise determination of the REE content in Ba-rich samples by ICP-MS.
研究领域:
分析化学
·
地球化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）