JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Zifei Yan,Yunpeng Hu,Chencan Du,Jian Deng,Kai Wang,Guangsheng Luo
The acidolysis of epoxides is an important series reaction applied in the polymer industry including coating and rubber. Glycidyl neodecanoate, which is a green material of environmentally friendly coatings, is synthesized through the acidolysis reaction of epichlorohydrin (ECH) with neodecanoic acid. We developed a green catalyst named tetramethylammonium neodecanoate (TMAN) for this reaction. TMAN is totally recyclable and the reaction system can be homogeneous, thus combining the advantages of tertiary amines and quaternary ammonium salts, meanwhile eliminating their drawbacks. Comparing with tetramethylammonium chloride (TMAC) which is a traditional industrial catalyst, the amount of side product dichlorohydrin can be reduced by more than 50%, effective utilization of ECH and yield of the main product can be increased by 5% and 2% respectively, and the reaction time can be reduced by 20% or more. We suggested a main catalytic reaction network including the conversion of TMAN to TMAC at the late stage of the reaction, and TMAC can be easily recycled and reused to prepare TMAN. More importantly, after the replacement of material acid and the carboxylic anion of catalyst, this efficient catalytic system and the mechanism network can be applied to other acidolysis reactions of epoxides.
研究领域:
化学工程
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Jing Fan,Liangliang Fan,Shuangshuo Liu,Fenhong Song
Globally, biofuel is considered as the largest renewable energy source to substitute the petrochemical fuel and it is thus received a great amount of attention from both developed countries and developing countries. Among all the biofuels, biodiesel is strongly recommended as a promising alternative fuel for traditional internal combustion engines. Thermal conductivity is an essential transport property of fuel, and is vital in the flow and heat transfer process. Therefore, it is necessary to conduct the research associated with fuel’s thermal conductivity . In this work, four binary fuel mixtures containing biodiesel components methyl caprate and ethyl caprate with n-undecane and n-tridecane were prepared respectively, and the liquid thermal conductivity of which were measured by the transient hot wire method system. The measurement was conducted at the temperature from 292 K to 362 K at atmospheric pressure. The experimental data reported here have an uncertainty of less than 2%. In addition, a correlation about the relationship between the liquid thermal conductivity with temperature and the esters’ concentration in different fuel blends has been correlated.
研究领域:
燃料化学
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热物理性质
·
可再生能源
·
生物燃料
·
传热传质
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Jing Fan,Bin Cui,Fenhong Song,Shuangshuo Liu,Xiaopo Wang
Biodiesel is considered a feasible replacement for fossil fuels. Alcohols are alternative biofuels, while also playing a role as additives to improve certain properties of diesel and biodiesel. In this work, the thermal conductivity in the liquid phase of binary mixtures of methyl caprate, usually the significant biodiesel component with three higher alcohols (1-propanol, 1-butanol, and 1-pentanol), was measured, with the temperature ranging from 287 K to 358 K at atmospheric pressure. The total standard uncertainty of the experimental results was estimated at less than 2% and the repeatability was better than ±0.5%. In addition, three correlations for estimating the thermal conductivity of mixtures were fitted and improved, with the average absolute relative deviation of the three correlations less than 0.30%.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advances in Mechanical Engineering
·
2017
·
IF 0.827
Tianyu Li,Yanping Yuan,Nan Zhang
Capric acid/expanded perlite form-stable phase change materials were prepared by vacuum adsorption. The phase change cement boards were prepared by adding capric acid/expanded perlite into cement mortar, and their thermal properties were tested. The results show that capric acid/expanded perlite improves the thermal storage capacity of the cement board; the latent heats of melting and freezing were 14.25 and 14.1 J g−1, respectively, at 20 wt% capric acid/expanded perlite. Capric acid/expanded perlite enhanced the specific heat capacity of the cement board, and the higher the content of the capric acid/expanded perlite in the cement board is, the higher the equivalent specific heat capacity is. Capric acid/expanded perlite also significantly reduced the thermal conductivity and the heat storage coefficient, while at the same time, increased the thermal inertia coefficient of the cement board. Compared with the ordinary cement board, the thermal conductivity of phase change cement board with mass ratios of 10, 15, and 20 wt% of capric acid/expanded perlite decreased by 39.4%, 47.83%, and 52.49% at 20°C and 37.94%, 46.84%, and 50.63% at 50°C, respectively; the heat storage coefficients decreased by 34.07%, 40.62%, and 44.87% at 20°C and 30.25%, 35.59%, and 37.65% at 50°C, respectively; the thermal inertia coefficients increased by 8.75%, 13.78%, and 15.96% at 20°C, and 8.75%, 21.53%, and 26.21% at 50°C, respectively.
研究领域:
建筑材料学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Ying Zhang,Taotao Zhan,Junshuai Chen,Xiangyang Liu,Maogang He
The use of ethyl decanoate combined with conventional diesel or biodiesel could be economically attractive. Thermophysical properties of ethyl decanoate at high temperatures can be an essential guidance for the structural design and optimization of the fuel injection system in diesel engine. The measurements of the speed of sound and the thermal diffusivity of ethyl decanoate (EeC10: 0) were carried out by the light scattering method, which are along five isobaric lines from (0.1–10) MPa at the temperatures (300.71–562.07) K and (295.34–565.49) K, respectively. The expanded relative uncertainties ( k = 2) of the measurement systems are estimated to be 1.2% for speed of sound and 2.4% for thermal diffusivity. The thermal conductivities of ethyl decanoate at pressures up to 10 MPa and in the temperature range (303–363) K are derived, which agree well with literature values finding an AAD of 0.81%. The pρT dependences of the thermal conductivity are analyzed based on the vibrational theory. The results obtained show that the higher density of biofuels leads to smaller distances between oscillating molecules, of which the collision probability and intermolecular energy transport are enhanced. The consistent behaviors of biofuels that higher density leads to higher conductivity, and the dependence of the thermal conductivity on density becomes smaller with temperature increase are verified.
研究领域:
热物理学
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燃料工程
·
动力工程
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Chao Su,Chenyang Zhu,Tianwang Lai,Tao Wang,Xiangyang Liu,Maogang He
New experimental densities and viscosities data for binary mixtures of methyl decanoate plus n -heptane were reported at temperatures of (298.15, 308.15 and 318.15) K and pressures of (0.1–15) MPa. The expanded uncertainty for density measurement is estimated to be 2 kg m −3 and the relative expanded uncertainty for viscosity measurement is estimated to be 0.03. A fitting equation was proposed to correlate the density of the binary mixture and Grunberg-Nissan equation was used to predict the viscosity of the binary mixture, respectively. The maximum absolute relative deviations between the experimental results and calculation values for densities and viscosities were 0.11% and 5.94%, respectively.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Ming-Qiang Jia,Qi-Zheng Liu,Li-Juan Zhu,Yan Zhang,Zhong-Xiu Chen
Hydrolysis of fatty acid anhydrides involves fatty acid vesicle formation and autocatalytic hydrolysis. Previous studies focused on the effect of biopolymers on vesicle formation or on autocatalytic reactions , however, the influence of polysaccharides on a system where the self-assembly of fatty acid vesicles and the hydrolysis of fatty acid anhydrides coexist remains unknown. In this paper, three polysaccharides, sodium chondroitin sulfate (CSA), sodium alginate (SA) and 2-hydroxyethyl cellulose (2-HEC) were selected to investigate the effect of crowded media on the decanoic acid vesicle formation and the autocatalytic hydrolysis of decanoic anhydride . The results showed that the rate of hydrolysis of decanoic anhydride increased in CSA or SA but decreased in 2-HEC. Further investigation revealed that the size of vesicles in CSA decreased in the early stage of vesicle formation but increased in 2-HEC. In the CSA-vesicle system, elastic behavior dominates, while 2-HEC- and SA-vesicles show more viscous behavior. In addition, the significantly increased membrane fluidity in CSA or in SA supports self-assembly of decanoic acid vesicles and autocatalytic hydrolysis, which is the opposite in the case of 2-HEC. This research provides new insights into the self-assembly of fatty acid vesicles and vesicle-catalyzed reactions with polysaccharides in crowded conditions.
研究领域:
生物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
Polymers
·
2015
·Vol. 7
·期 3
·468-483
·
IF 3.681
Dongjian Shi,Jinting Hua,Li Zhang,Mingqing Chen
Novel bio-based aliphatic copolyesters, poly(lactic acid-co-10-hydroxy decanoate) (P(LA-co-HDA), PLH), were successfully synthesized from lactic acid (LA) and 10-hydroxycapric acid (HDA) by a thermal polycondensation process, in the presence ofp-toluenesulfonic acid (p-TSA) and SnCl2·2H2O as co-catalyst. The copolymer structure was characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H NMR). The weight average molecular weights (Mw) of PLH, from gel permeation chromatography (GPC) measurements, were controlled from 18,500 to 37,900 by changing the molar ratios of LA and HDA. Thermogravimetric analysis (TGA) results showed that PLH had excellent thermal stability, and the decomposition temperature at the maximum rate was above 280 °C. The glass transition temperature (Tg) and melting temperature (Tm) of PLH decreased continuously with increasing the HDA composition by differential scanning calorimetry (DSC) measurements. PLH showed high ductility, and the breaking elongation increased significantly by the increment of the HDA composition. Moreover, the PLH copolymer could degrade in buffer solution. The cell adhesion results showed that PLH had good biocompatibility with NIH/3T3 cells. The bio-based PLH copolymers have potential applications as thermoplastics, elastomers or impact modifiers in the biomedical, industrial and agricultural fields.Keywords:bio-based copolymer;poly(lactic acid);poly(10-hydroxycapric acid);high performance;mechanical properties
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2018
·
IF 3.246
Ziyan Lu,Zhenzhen Cao,Enzhu Hu,Kunhong Hu,Xianguo Hu
A method was developed to prepare WS 2 and WS 2 /TiO 2 nanoparticles . A blue tungsten oxide precursor was synthesized from Na 2 WO 4 , CH 3 CSNH 2 , and HCl. WS 2 nanoplatelets was produced after sulfurizing the precursor at 300 °C. Nano-TiO 2 could be activated by HCl and provide active sites for the deposition of the precursor to produce WS 2 /TiO 2 nanoparticles after sulfurization. The as-prepared two nano-additives slightly affected the friction reduction of diisooctyl sebacate (DOS), but they, especially WS 2 /TiO 2 , remarkably improved the wear resistance of DOS. Compared with the pure DOS, the 0.75% WS 2 /TiO 2 -containing DOS decreased the wear volume by ∼81%. The anti-wear performance of WS 2 /TiO 2 is ascribed to the formation of a lubricating film and the synergistic lubrication effect of WS 2 and TiO 2 .
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Kun Hou,Ziwen Zhang,Sa Xue,Xiangyang Liu,Maogang He
Biodiesel is a very promising renewable fuel, and adding diethyl carbonate (DEC) can improve the combustion process of biodiesel. In this work, the isobaric molar heat capacities (Cp) of DEC, methyl caprate, and their binary mixtures were measured at temperatures from 314.75 to 344.75 K and at pressures up to 25.2 MPa over the molar fraction of DEC from 0.1 to 0.9 with a flow calorimeter. The relative expanded uncertainty of the experimental system was lower than 0.01. Experimental results show that the Cp values of DEC, methyl caprate, and their binary mixtures increase approximately linearly with increasing temperature and decreasing pressure. Meanwhile, the Cp values of the binary mixtures were observed to decrease with the increase of DEC content, indicating that the addition of DEC can indeed improve the combustion process of methyl caprate. Besides, the excess isobaric molar heat capacities (CpE) of the binary mixtures were calculated; it was found that they are so small compared with the Cp and that the binary mixtures can be considered as ideal solutions. At last, a correlation for the Cp of the binary mixtures was proposed with the maximum absolute relative deviation of 0.81% and an average absolute relative deviation of 0.23%, respectively.
研究领域:
能源科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR RECOGNITION
·
2025
·Vol. 38
·期 4
·e70008
·
IF 3
Xuewen Cai,Lu Zheng,Erdeng Du,Rui Ma,Jun Chen,Yao Wu,Jiayao Li,Xichen Wang,Mingguo Peng
Per- and polyfluoroalkyl substances (PFASs) have raised significant environmental and health concerns due to their persistence and toxicity. The study employed a comprehensive analytical approach to clarify the interaction mechanisms between perfluorodecanoic acid (PFDA) and perfluorosebacic acid (PFSEA) with human serum albumin (HSA). The results indicated that PFDA/PFSEA quench HSA's intrinsic fluorescence through static quenching. At 298 K, PFDA demonstrated a more pronounced effect, with a higher binding constant of 9.14 × 10 5 mol/L, surpassing PFSEA's constant of 7.65 × 10 4 mol/L. Thermodynamic analysis revealed that hydrogen bonding was the predominant force in the HSA-PFDA/PFSEA interaction, and the binding processes were exothermic and spontaneous. Quantum chemical structure analysis underscored the heightened reactivity at the carbonyl groups of PFDA and PFSEA. Molecular docking and competitive binding experiments confirmed that PFDA/PFSEA bind to HSA's IIA subdomain, inducing alterations in HSA's secondary structure and amino acid residue's microenvironment. The HSA-PFDA complex exhibited a lower binding free energy (−15.91 kcal/mol) than the HSA-PFSEA complex (−11.06 kcal/mol), indicating a stronger binding affinity. This study elucidated the interactions of PFDA and PFSEA with biological macromolecules, revealing their bioactivity and informing their biosafety and environmental risk assessment.
研究领域:
环境科学
·
生物化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Chao Su,Chenyang Zhu,Feng Yang,Zheng Ye,Xiangyang Liu,Maogang He
The isobaric molar heat capacities of ethyl octanoate and ethyl decanoate were determined at T = 294–354 K and p = 0.1–24 MPa. The measurements were conducted by a flow calorimeter. The measured results were in good agreements with several available experimental data at atmosphere pressure and the calculated results at high pressure in literatures. Furthermore, a fitting equation was presented to calculate the Cp of ethyl octanoate and ethyl decanoate. The maximum absolute relative deviations between experimental results and calculated data are lower than 0.4%.
研究领域:
物理化学
·
热力学
✓ 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）