JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Taotao Zhan,Ying Zhang,Qi Zhou,Junshuai Chen,Xiaopo Wang,Xiangyang Liu,Maogang He
Ethyl nonanoate is a promising component of biodiesel with a satisfactory cetane number and reactivity. The speeds of sound in ethyl nonanoate were measured by the Brillouin light scattering (BLS) method within the temperatures from 295.24 to 593.15 K and at pressures up to 10 MPa. The relative expanded uncertainty (k = 2) of our BLS experimental system is estimated to be less than 0.7%. The densities of ethyl nonanoate were measured using a vibrating tube densimeter at atmospheric pressure in the temperature range of 293.15–353.15 K, and the absolute average relative deviation between the experimental densities and the literature data is 0.12%. For temperatures between 303.15 and 353.15 K and at pressures up to 10 MPa, these measurements were used to calculate densities, isobaric heat capacities, and indirect derivative properties including the isobaric thermal expansion, the isothermal compressibility, the isentropic compressibility, and the internal pressure. The comparison between the calculated isobaric heat capacities and the literature values shows a satisfactory agreement with an absolute average relative deviation of 0.18% and a maximum deviation of 0.38%. At the end, the dependences of internal pressure of ethyl nonanoate on temperature and pressure were found to be in accordance with those of ethyl caprylate and ethyl caprate.
研究领域:
物理化学
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燃料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Xinyu Fan,Ying Yang,Yuxi Gong,Yuqi Zhan,Xiangyu Zhang,Shi Zhou,Dongmei Wu
Based on the inherent alkaline adaptability of fatty acid vesicles (FAVs) when in contact with the human body, along with the very narrow pH window for the formation and application of FAVs, which is far from the physiological pH range, this study successfully prepared a composite vesicle of non-ionic surfactant Tween60 (TW60) with nonanoic acid (NA) to migrate and expand the pH window. Acid-base titration confirmed that adding varying proportions of TW60 to sodium nonanoate (SN) solutions expanded the pH window from 6.6–7.5 to 1.28–6.52, widening it by 5.24, as determined by conductivity and turbidity. Studies under different conditions such as ionic strength, temperature, and storage time indicated that NA/TW60-FAV exhibited excellent stability. At a myricetin (MYR) concentration of 1 mg/mL and a pH of 6, encapsulation efficiency (EE) was 93.03 ± 0.03 %, and the drug loading capacity (DLC) was 8.65 ± 0.02 %, reaching the highest values. In vitro release and skin permeation results indicated that compared to free MYR solution (1 mg/mL), the skin permeability of the MYR-loaded composite vesicles (NA/TW60/MYR-FAV) was 1.64 times that of the MYR solution, significantly increasing skin absorption and retention, with a pronounced sustained release effect. The antioxidant activity experiments confirmed a significant enhancement in its ability to scavenge DPPH, ferric ions, and hydroxyl radicals (OH). The antibacterial experiments showed that NA/TW60/MYR-FAV had significant inhibitory effects against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), indicating potential applications in cosmetics. In summary, the pH range of the blank composite vesicles (NA/TW60-FAV) aligns with the requirements for human skin adaptation, significantly enhancing the intrinsic value of the loaded substance. This indicates that it is a reliable and stable vesicle carrier, offering preliminary evidence for further research and application in the cosmetics industry.
研究领域:
化妆品科学
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药剂学
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生物医学工程
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DOI
高影响因子
Energy Technology
·
2017
·Vol. 5
·期 12
·2309-2316
·
IF 2.789
Zhao Wang,Jinhe Sun,Shaolei Xie,Guixiang Ma,Yongzhong Jia
The thermal properties of a binary system composed of lauric acid (LA) and nonanoic acid (NA) and its binary phase diagram were studied. To put this binary system into practice, the mixture containing 96 wt % of LA was selected, which has a phase-change temperature of 41 °C and a latent heat of 163 J g −1 , which is suitable for a domestic water heating application. Additionally, its thermal and chemical structure stability, thermal conductivity, degree of supercooling, and thermal reliability were investigated by using thermogravimetric analysis, FTIR spectroscopy, thermal conductivity analysis, the T -history method, and an accelerated thermal cycle test for 1000 melt/freeze cycles, respectively. The results of these tests indicated that the mixture has a remarkable thermal stability, a good chemical structure stability, no supercooling, and an excellent thermal reliability. Therefore, the mixture can be a potential phase-change material for thermal energy storage.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2017
·Vol. 41
·期 15
·2555-2564
·
IF 2.598
Zhao Wang,Shang Liu,Guixiang Ma,Shaolei Xie,Guangwei Du,Jinhe Sun,Yongzhong Jia
Summary To satisfy the application demands for latent heat storage in the temperature range from 5°C to 15°C, an original composite phase change material (PCM), CA-NA/EG (caprylic-nonanoic acid/expanded graphite), was prepared and characterized. For CA-NA/EG, the mass ratio of CA and NA was 8:2, and the mass percentage of the CA-NA in CA-NA/EG composite PCM was determined as 90% by leakage test. The melting and freezing points of the CA-NA/EG were 6.84°C and 9.34°C, and corresponding latent heats were 108.75 kJ/kg and 107.67 kJ/kg. In addition, its thermal conductivity, thermal stability and reliability were investigated by thermal conductivity apparatus (TCA), thermal gravimetric analyzer (TGA), and accelerated thermal cycle test for 100 melt/freeze cycles, respectively. The results showed that the CA-NA/EG had a good thermal stability and an excellent thermal reliability. Moreover, the thermal conductivity of CA-NA/EG had an improvement of 25% than that of the CA-NA. On the other hand, the accelerated thermal cycle test also indicated that the CA-NA/EG had no supercooling during all melt/freeze cycles. Therefore, the prepared composite PCM, CA-NA/EG, can be applied for low-temperature thermal energy storage owing to its proper melting temperature, acceptable latent heat and thermal conductivity, excellent thermal stability and reliability.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
ENERGY AND BUILDINGS
·
2017
·
IF 4.067
Zhao Wang,Guixiang Ma,Shang Liu,Yan Jing,Jinhe Sun,Yongzhong Jia
The thermal properties of caprylic acid, nonanoic acid and their binary system were investigated by differential scanning calorimetry (DSC). The phase diagram for the binary system was constructed, and the experiment results showed that the eutectic temperature and the molar fraction of caprylic acid for the eutectic mixture are 1.83 °C and 0.483, respectively. To satisfy the application demands of the temperature scope from 5 °C to 15 °C, another binary mixture for the binary system with a molar fraction of 0.814 for caprylic acid component is found successfully, and it has good thermal properties that the melting temperature and the latent heat are 7.6 °C and 123 J g −1 , respectively. What is more, the latent heat and melting temperature for the binary mixture do not change at all nearly after being cycled 100 times during the whole melting process. As a novel phase change material (PCM) for application in the field of air conditioning and cooling, the binary mixture has own unique thermal advantages.
研究领域:
能源工程
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材料科学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 31
·期 1
·1-14
·
IF 2.8
Song T.,Ren L.,Li W. B.,Liu Q.,Qin Y. X.,Zhang Y. L.,Wang Y. B.,Shen Y. D.,Du W. N.,Zhang M. Y.
In this contribution, isosorbide dinonanoate (SDN), an environmentally sustainable plasticizer for polypropylene (PP), is successfully synthesized by virtue of esterification reaction using isosorbide and nonanoic acid with the reaction temperature of 120 °C, and the reaction time of 5 h. When the corporation of plasticizer SDN into PP matrix is the value of 15 phr, the impact strength of PP blends reaches 121 J/m, the dramatically increase of 384% compare to that of PP. DMA results shows that the glass transition temperature (T g ) of PP blends gradually decline with the increasing amount of SDN, indicating the efficient plasticization action of the SDN. It is suggested that SDN can be feasibly inserted into the non-polar matrix and then more evenly dispersed in matrix, herein, it will increase the distance between the polymer chains, improving the mobility of the molecular chains and the processing performance of the polymers. Furthermore, the plasticizing effect and environmental friendliness of SDN can be a potential replacement for o-phenyl plasticizers in the industry in the future.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Jingxuan Cai,Chunmei Zhang,Li Zeng,Hao Xu,Jia Wang,Kaiqiang Liu,Xiaowei Cheng
Encountering natural gas hydrate (NGH) is inevitable in the process of drilling and the production of oil and gas wells in deep-sea and shallow formations. The heat released by the cement slurry during the hydration process will cause the decomposition of gas hydrates, which will lead to annular channelling. Our purpose is to improve the cementing quality and ensure the safety of oil and gas production. In this paper, temperature control phase change microcapsules (PCMCs) with dodecanol (DA)/n-decanoic acid (CA) composite phase change materials (PCMs) as the core and active silica as the shell were prepared by a chemical precipitation method to store and release heat reversibly, to reduce the hydration heat of cement and improve the early strength. Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy spectrometry (EDS) were used to test and analyse the chemical structure and microscopic morphology of the synthesized temperature-controlled phase change microcapsules. Differential scanning calorimetry (DSC) was used to determine the phase change characteristics of the phase change microcapsules. The thermal stability of the phase change microcapsules was measured by a thermogravimetric analyser (TG). The application of PCMCs in a low-temperature cement slurry was also investigated. The results showed that the synthesized microcapsules had good thermal stability with a phase transformation temperature of 12.4 ℃ and enthalpy of 1.65 J/g. PCMCs can effectively control the hydration heat of cement and reduce the rise of hydration temperature by 6.06% to 11.79%. In addition, PCMCs can slowly release heat to promote the hydration of cement in the later strength development, and improve the early compressive strength of cement in the range of 5 ℃ to 10 ℃.
研究领域:
材料科学
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石油工程
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DOI
高影响因子
SPECTROSCOPY LETTERS
·
2014
·
IF 0.718
Fang Yu,Chang Liu,Yuhong Guo,Yaling Yang
A simple and fast extraction termed vortex-assisted liquid–liquid microrextraction coupled with molecular fluorescence spectroscopy has been developed and used for the detection of three sulfonamides (sulfadiazine sodium, sulfamethoxazole, and sulfaguanidine) in the meat samples. In the vortex-assisted liquid–liquid microrextraction method, 400 µL of nonanoic acid was used as extractant and directly injected into 10 mL centrifuge tube containing a derivative, which sulfonamides derived with o-phthaladehyde. And the extraction solvent was dispersed into the water phase under mechanical force with the vortex-mix. The polar side was reduced and the strong fluorescence produced at λex = 295 nm. Variable parameters affecting the derivatization and vortex-assisted liquid–liquid microrextraction procedure were evaluated and optimized. The vortex-mix substituted effect of disperser solvent in this procedure. The limits of detection were 2.0 ng mL−1 for sulfadiazine sodium and sulfamethoxazole, 0.5 ng mL−1 for sulfaguanidine with the relative standard deviations of the method ranging from 2.5% to 6.1%. And the calibration graph was linear from 5 to 5000 ng mL−1 with coefficient of determinations more than 0.9995. Recoveries of the three sulfonamides on spiked meat samples at different levels were 92.2–102.5%. Finally, the method has been successfully applied to the determination of sulfonamides from meat samples.
研究领域:
分析化学
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食品科学
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药物分析
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DOI
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2018
·Vol. 120
·期 7
·1700415
·
IF 2.2
Meizhen Lu,Libo Peng,Qinglong Xie,Yong Nie,Xuejun Liu,Xianghong Lu,Jianbing Ji
At present, the utilization of grease has attracted more and more attention. This article presents a simple method that efficiently cleaves methyl oleate-derived methyl 9,10-epoxystearate ( a ) to give high yields of methyl 9-oxononanoate ( d ) with nonanal ( c ) as co-product. A WO 3 /MCM-41 catalyst is prepared via direct mixed-gel synthesis. The catalyst is tested in the oxidative cleavage of a to produce d which can be used as a polymer precursor or an important feedstock. The effects of WO 3 loading, temperature, time, H 2 O 2 / a molar ratio, catalyst/ a weight ratio, and t -BuOH/ a weight ratio on the a conversion and d yield are examined using single-factor experiments. The optimal reaction conditions are determined by orthogonal experiments. The optimal WO 3 loading, temperature, time, H 2 O 2 / a molar ratio, catalyst/ a weight ratio, and t -BuOH/ a weight ratio are 35%, 80 °C, 20 min, 1.3, 0.04, and 0.5, respectively. Under these conditions, the a conversion and d yield reach 99.4 and 78.4%, respectively. In addition, the catalyst shows no significant decrease in activity after being reused three times. Moreover, the reaction mechanism is studied based on the product distribution over time. Practical Applications : Few studies on methyl 9,10-epoxystearate used as the raw material to give methyl 9-oxononanoate and nonanal are found. Because the ethylene oxide bond is more unstable than the carbon–carbon double bond, the oxidative cleavage of methyl 9,10-epoxystearate is easier than cleavage of methyl oleate that allows the oxidative cleavage to be done under milder conditions. Methyl 9-oxononanoate can be converted to a monomer of high-value polymers and is also an important feedstock in the production of chemicals. The co-product nonanal is a natural spice which can be used in the fragrance industry. The results show that the reaction time is short and methyl 9-oxononanoate yield is high under mild reaction conditions. The method in this study can also be widely used in other oxidative cleavage reactions of epoxides. Methyl 9,10-epoxystearate is used as the raw material to produce methyl 9-oxononanoate with nonanal as co-product using WO 3 /MCM-41 as catalyst and H 2 O 2 as oxidant.
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Xiaojie Wang,Shanshan Zhu,Xiaopo Wang
The experimental measurements for liquid viscosities of four fatty acid methyl esters, including methyl hexanoate, methyl heptanoate, methyl caprylate, and methyl nonanoate, were carried out with a falling-cylinder viscometer. For the present measurement, the temperature ranges were from 292 K to 362 K and the pressure was reached to 30 MPa. The combined expanded relative uncertainty of the viscosity measurements was within 0.03 with 0.95 confidence level. The viscosity data for each studied esters were correlated by Andrade-Tait equation, and the average absolute relative deviation between the experimental data and calculated values is 0.31%, 0.44%, 0.38%, and 0.25% for methyl hexanoate, methyl heptanoate, methyl caprylate, and methyl nonanoate, respectively. The maximum absolute relative deviation is 1.09%, 1.28%, 1.28%, and 0.75%.
研究领域:
化学工程
·
物理化学
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DOI
高影响因子
Friction
·
2022
·Vol. 11
·期 6
·911-926
·
IF 4.924
Yu Hongxiang,Chen Haijie,Zheng Zhiwen,Qiao Dan,Feng Dapeng,Gong Zhenbin,Dong Guojun
Nine organic compounds were utilized as model lubricants to investigate the impact of functional groups on tribological performances. Nonanoic Acid with carboxyl showed the best lubrication properties, and fluid film and tribofilm were coexistent in its friction test, bringing a low friction coefficient and wear rate. In addition, the lubricant with low friction coefficient corresponded to high adsorption energy in density functional theory (DFT) calculations. And the lubricant forming adsorption film with large surface energy displayed small wear rate in friction test. Moreover, adsorption energies positively correlated surface energies. Based on the experimental results, the action mechanism of functional groups on tribological properties of lubricants was proposed. Various functional groups make lubricant molecules show different adsorption energies and surface energies. Lubricant molecules with high adsorption energy are more likely to adsorb on substrates and form a vertical monolayer, which can maintain a regular molecular brush structure during friction and bring a low friction coefficient. And lubricant molecules with high surface energy may be more prone having tribochemical reactions during friction and forming protective tribofilm, which leads to a low wear rate.
研究领域:
摩擦学
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材料科学
·
化学工程
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DOI
高影响因子
Journal of Physical Chemistry Letters
·
2022
·
IF 6.888
Jianfeng Li,Jinjin Li
Oxidized black phosphorus (BP) has been demonstrated as a promising oil-based nanoadditive because of its superior friction-reducing capability. However, the synergistic lubrication effect between oxidized BP and oil at the molecular level dominating the friction properties remains unclear. In this Letter, the synergistic lubrication effect between oxidized BP and two typical oil molecules (nonane and nonanoic acid) was explored with an atomic force microscope. The superlubricity of oxidized BP with an ultralow friction coefficient of 0.006 was achieved in the nonanoic acid environment, exhibiting a 96% reduction compared with that in the nonane environment. There was a confined nonanoic acid layer in the contact zone with a tilt angle of 35° because of the hydrogen bonding interaction, contributing to the superlubricity. This observation sheds light on the exploration of the lubrication mechanism of oxidized BP as a nanoadditive in oil, which reveals the considerable implications for the design of high-performance lubrication system.
研究领域:
纳米技术
·
材料科学
·
摩擦学
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表面科学
·
化学物理
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DOI
高影响因子
危险品化学品经营许可证（带存储）