FLUID PHASE EQUILIBRIA
·
2015
·
IF 2.2
Zhixian Huang,Ling Li,Miaomiao Zhou,Haiming Jiang,Ting Qiu
Vapor–liquid equilibrium data for ethyl trifluoroacetate + trifluoroacetic acid , ethyl trifluoroacetate + ethanol, and trifluoroacetic acid + water at the pressure 101.3 kPa were measured with a modified Rose still. The thermodynamic consistency of the VLE data was confirmed by Herrington’s method. The VLE data were correlated by the NRTL and Wilson models with satisfactory results, and the interaction parameters of these mixtures were estimated.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Zhixian Huang,Haiming Jiang,Ling Li,Hongxing Wang,Ting Qiu
The properties of ethyl trifluoroacetate (CF 3 COOCH 2 CH 3 ) were measured as a function of temperature: density (278.08 to 322.50) K, viscosity (293.45 to 334.32) K, saturated vapor pressure (293.35 to 335.65) K. The density data were fitted to a quadratic polynomial equation, and the viscosity data were regressed to the Andrade equation. The correlation coefficient ( R 2 ) of equations for density and viscosity are 0.9997 and 0.9999, respectively. The correlation between saturated vapor pressures and temperatures was achieved with a maximum absolute relative deviation of 0.142%. In addition, the molar evaporation enthalpy in the range of T = (293.35 to 335.65) K was estimated by the Clausius–Clapeyron equation.
研究领域:
化学
·
热力学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jinshui Duan,Ruijun Jia,Kangning Liu,Mingyang Yu,Quanjiang Lv,Shahid Hussain,Sameh M. Osman,Jun Dai,JunLin Liu,Chunxia Wu
Perovskite quantum dots (QDs) have garnered significant interest for their superior optical properties . Despite their attractive photovoltaic properties and chemical processing ability, the high defects density within QDs can result in the annihilation of luminescence. In this study, cesium trifluoroacetic acid (CsTFA) was used as the cesium source, replacing conventional cesium carbonate (Cs 2 CO 3 ) and introducing TFA ligands to improve the luminescence quality of QDs . As well as doping with Zn 2+ to enhance both the stability and luminescence quality of the quantum dot solution. The doped QDs exhibit the highest photoluminescence (PL) intensity, which is further enhanced by the perovskite QDs with TFA as a ligand. Furthermore, the PL spectra of CsPbBr 3 and TFA-CsPbBr 3 : Zn (10 %) QDs with the temperature changes have also been analyzed. The result reveals the relationship between excitons and phonons . Based on the result, Zn 2+ doped and TFA ligand induced perovskite QDs have the potential to serve as an optimal material.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 100
·期 10
·4491-4499
·
IF 2.841
Kangkang Yuan,Zhichao Yu,Chonghe Xu,Cong Feng,Xinzhu Gan,Xinqiang Wang,Luyi Zhu,Guanghui Zhang,Dong Xu
Acetic acid, lactic acid, and trifluoroacetic acid were used as complex agents for the preparation of dense barium zirconate fibers with electrospinning method. The formation of lactate when lactic acid was used as complex agent led to a mild decomposition process which was beneficial for the fabrication of dense barium zirconate fibers. High temperature stable intermediate phase of BaF 2 appeared when trifluoroacetic acid was used. The intermediate phase of BaF 2 was disadvantageous for pure and dense barium zirconate formation. While water vapor preheat treatment for BaF 2 contained fibers was an effective way for the fabrication of pure and dense barium zirconate fibers.
研究领域:
材料科学
·
无机化学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Wenjun Lu,Baiwang Sun
Trifluoroacetic acid (TFA) is a ubiquitous and persistent environmental pollutant with significant environmental and human health impacts. To the best of our knowledge, no study has reported the use of porous organic polymers to adsorb TFA vapor. In this study, we successfully synthesized a polymer (POPSP-4) that exhibits both physical and chemical adsorption for efficient TFA capture, and physical adsorption can occur at the sulfur sites. With the assistance of organic bases, the adsorption capacity of the polymer increases from 2.3 g·g–1 to over 4 g·g–1 in 1 h and effectively prevents the escape of TFA from the polymer. This study presents a promising methodology for the design and synthesis of porous organic materials, specifically for the efficient capture of TFA vapor.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2019
·Vol. 51
·期 21
·4048-4065
·
IF 2.867
Rui-Xiang Wang,Zhuang Fang,Guanyinsheng Qiu,Wenlin Xie,Jin-Biao Liu
The copper-catalyzed synthesis of 3-vinylisocoumarin-1-imine is reported. The transformation proceeds smoothly with good yields in THF and the regioselectivity was determined by a O-nucleophilic 6-endo cyclization. Studies on the mechanism indicate that copper trifluoroacetate serves as a Lewis acid, and the use of vinyl-connected 2-alkynylbenzamide is important for this O-nucleophilic 6-endo cyclization.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
·
IF 3.512
Jiang Wu,Xian Li,Jianxing Ren,Xuemei Qi,Ping He,Bu Ni,Chong Zhang,Chengzhen Hu,Jun Zhou
TiO 2 hollow sphere was synthesized by hydrothermal method using trifluoroacetic acid (TFA) and Ti(SO 4 ) 2 as raw materials, and it was applied to photocatalytic oxidization of elemental mercury (Hg 0 ) in the simulated flue gas. The prepared samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (UV-vis DRS) and nitrogen adsorption/desorption. The results showed that only anatase phase TiO 2 hollow sphere was obtained. The average diameter of TiO 2 hollow spheres was about 800 nm and the shell thickness was about 200–400 nm. When M , the molar ratio of TFA to Ti(SO 4 ) 2 , was higher than a certain value, the photocatalytic activity of prepared TiO 2 hollow spheres began to reduce. When M = 2, addition TFA content was the best quantity, which got the best TiO 2 hollow spheres and provided the most appropriate F − decomposed from TFA during the sample preparation, which was helpful to its photocatalytic ability. In the experimental temperature range, the photocatalytic oxidation efficiency decreased with the increasing of reaction temperature, and the intensity of UV irradiation had an important effect on the photocatalytic reaction. When UV irradiation intensity was 303.45 μW cm −2 and reaction temperature was 55 °C, TiO 2 hollow sphere sample prepared at M = 2 had the highest photocatalytic ability and the mercury removal efficiency reached up to 82.75%.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Guojia Yu,Xiaojia Wu,Lu Wei,Zhiyong Zhou,Wei Liu,Fan Zhang,Yixin Qu,Zhongqi Ren
Ionic liquids (ILs) are highly efficient green solvents for the removal of thiophene sulfides. Several acidic ionic liquids (ILs) were synthesized with N-formylmorpholine (NFM) as cation and formic acid (HCOOH), sulfuric acid (H 2 SO 4 ), p-toluenesulfonic acid (Tos), trifluoroacetic acid (TFA) as anions. [NFM][TFA] was selected in one-pot extraction-oxidative desulfurization process. The initial sulfide concentrations, competition with olefins and aromatics and the desulfurization mechanism were explored. When V IL /V oil = 1:20, O/S = 3, 60 °C, the desulfurization efficiency of DMDBT and DBT were 99.82% and 99.67% in 30 min, respectively. After recycling five times, the desulfurization efficiency of [NFM][TFA] for DBT could maintain over 98%. When the initial real diesel concentration of 535 ppm and 298 ppm, the desulfurization efficiencies of real diesel were 44.42% and 56.46%, the values increased to 85.73% and 92.13% after extraction and re-extraction by [DBU][Pr]. The mechanism of desulfurization process was proposed that [NFM][TFA] reacted with H 2 O 2 to form corresponding peroxyacid transition state, and DBT in IL phase was oxidized to the corresponding sulfones.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xiaoqun Wang,Yiwen Hou,Zhuanghao Hou,Wei Xiong,Guangming Huang
Imaging of cholesterol and other metabolites simultaneously by ambient mass spectrometry will greatly benefit biological studies, however, it still remains challenging. Herein, by adding acid into the desorption electrospray ionization (DESI) spray solvent, we achieved simultaneous mass spectrometry imaging of cholesterol and other metabolites directly from mouse brain sections. The introduction of acid increased the signal intensity of cholesterol in mouse brain tissues by approximately 21-fold. Additionally, the present strategy provided increased signal intensities for other metabolites up to 62-fold, as well as identification of seven more metabolites (23 vs 16 for acid-enhanced DESI vs DESI). Moreover, increased corelationships for alanine as well as putrescine and spermidine with cholesterol were discovered under acid-enhanced DESI. The potential of the present strategy in the fields of biological and medical research was demonstrated by investigating the level change for cholesterol, alanine, putrescine, and spermidine in Alzheimer’s disease (AD) mouse brain.
研究领域:
生物学
·
医学研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Zhiyong Zhao,Zhihua Liu,Qishi Zhong,Yujun Qin,Aizhen Xu,Wen Li,Jiahua Shi
Trifluoroacetic acid (TFA) is used for the first time as dopant in the synthesis of the graphene oxide/polyaniline (GO/PANI) composite. The composite was prepared through fast in situ polymerization of aniline (ANI) on GO sheets. After filtration and freeze-drying, the GO/PANI was reacted with hydrazine hydrate to produce reduced graphene/polyaniline (rGO/PANI). In the rGO/PANI, the morphology of PANI can be easily controlled by adjusting the mass ratio of GO to ANI. Oriented PANI was evenly and tightly attached on the rGO backbone to form a hierarchical composite for use as an electrode material in a flexible all-solid-state supercapacitor (ASSSC) with symmetric structure. At the optimal ratio of GO to ANI, the rGO/PANI on carbon cloth attained a high specific capacitance of 810 F g–1 at a current density of 1 A g–1 in a three-electrode system. The energy storage mechanism of the rGO/PANI was found to be mainly controlled by the surface redox reaction process. The rGO/PANI-based symmetric ASSSC displayed considerable capacitance retention of 91.3% after 2000 cycles. Furthermore, the device exhibited a maximum energy density of 62.2 Wh kg–1 at a power density of 0.8 kW kg–1. These favorable properties are primarily attributed to the enhanced interaction between rGO and PANI after the introducing of TFA, which accelerates the electron/ion transfer during charging and discharging by the synergistic effects of double-layer capacitance and pseudocapacitance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yuanqi Duan,Zhengyu Hu,Long Jin,Tieqiang Zong,Xiaohui Zhang,Yanan Liu,Pengcheng Yang,Jinfeng Sun,Wei Zhou,Gao Li
The degradation of Belamcanda chinensis (L.) DC. polysaccharides was carried out by five concentrations of trifluoroacetic acid (TFA) (1–5 mol/L), and their physicochemical properties, degradation kinetics and anticomplementary activity were investigated. The findings revealed a notable reduction in the molecular weight of BCP, from an initial value of 2.622 × 10 5 g/mol to a final value of 6.255 × 10 4 g/mol, and the water solubility index increased from 90.66 ± 0.42 % to 97.78 ± 0.43 %. The degraded polysaccharides of B. chinensis exhibited a comparable monosaccharide composition comprising Man, GalA, Glc, Gal, and Ara. As the concentration of TFA increased, the degradation rate constant increased from 1.468 × 10 −3 to 5.943 × 10 −3 , and the process followed the first-order degradation kinetic model (R 2 > 0.97) and the random fracture model (R 2 > 0.96). Furthermore, the five degraded polysaccharides still exhibit good thermal stability. In vitro experiments showed that DBCP-3 exhibited more potent anticomplementary activity than the original polysaccharides and positive drugs, which was strongly correlated with its Mw ( r = 0.6–0.8), inhibiting complement activation by blocking C2 and C4. These results indicated that TFA degradation has a positive effect on polysaccharides, of which DBCP-3 is expected to treat diseases involving hyperactivation of the complement system.
研究领域:
植物化学
·
免疫学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 3
·e202303342
·
IF 1.9
Nianming Jiao,Junjie Cui,Long Liu,Yuan Yao,Yangfeng Xia,Yanqiang Zhang
Graphical Pyridinium trifluoroacetate-based ILs effectively catalyzed the cyclization of 2-propyl ketazine to pyrazolines, achieving conversion and selectivity rates of 98 % and 99 %, respectively. Thermodynamic data were obtained through DFT calculations and calorimeter tests, providing valuable insights for the practical application of ketazine intramolecular cyclization to synthesize pyrazolines. In this work, pyridinium trifluoroacetate ionic liquids, as a protonic acid catalyst, were used to catalyze intramolecular cyclization of ketazine to synthesize 2-pyrazoline. The investigation encompassed the impact of temperature, solvent, dosage of ionic liquid catalyst, and the structure-activity relationship in the cyclization reaction of 2-propyl ketazine. The optimal catalytic performance was achieved at 100 °C with 8 mol % of 3,5-dimethylpyridinium trifluoroacetate in a solvent-free environment. Moreover, thermodynamic and kinetic data were determined through density functional theory calculations and calorimetric experiments. These protonic acid ionic liquids address the issue of excessive traditional protonic acid dosage in the intramolecular cyclization of ketazine, while also presenting a viable pathway for the catalytic synthesis of 2-pyrazolines.
研究领域:
有机化学
·
催化化学
·
材料科学
✓ 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）