JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 315
·期 3
·581-593
·
IF 1.181
Jie Fengping,Bai Zhishan,Yang Xiaoyong
A microemulsion consisting of sodium laurate, n -pentanol, n -heptane and NaCl solution was investigated for Co(II) extraction. The dilution method and conductivity method were used for the determination of structural parameters of sodium laurate/pentan-1-ol/heptane/NaCl microemulsion system. Co(II) was found to be extracted into the microemulsion phase due to the compound formation of [CoCl] + [R 11 COO] − , which was confirmed by the continuous variation of R 11 COONa concentration. Moreover, the effects of cosurfactant, the contact time, the phase ratios, PH and the NaCl concentration in feed solutions on the cobalt extraction yield were investigated. Under the optimum conditions, the extraction percentage of Co(II) could reach 98.9%.
研究领域:
化学
·
环境科学
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Dongming Chen,Xuebing Li
Organic phase change materials (PCMs) such as fatty acids and fatty alcohols are often trapped by inherent low thermal conductivity for thermal energy storage in buildings. The present study is devoted to ameliorating this problem from an innovative perspective of introducing bio-sourced additive. To promote performance of binary eutectic PCM comprising lauric acid (LA) and 1-hexadecanol (HD), the composite PCMs are developed, where the powdered seashell waste is added as thermal enhancer, and their thermo-physical properties are characterized via DSC, FT-IR, SEM, TGA, cooling curve analysis, accelerated thermal cycling test together with thermal conductivity measurement. Meanwhile, the impacts of two particle sizes, five mixing ratios between two different sizes and two modification approaches of seashell powder (SP) are surveyed meticulously. Experimental results turn out that 80-mesh SP and 300-mesh SP are both capable of providing greater thermal conductivity when dispersed in LA-HD eutectic PCM, and the enhancement level of thermal conduction is even higher for composite PCM containing 300-mesh SP than for composite PCM containing TiO 2 powder. Besides, the thermal conduction ability is strengthened to the maximum extent when 80-mesh SP and 300-mesh SP are combined at mass ratio of 3:7, while the same situation also occurs when seashell powder is treated by high-temperature calcination. The resultant composite PCM possesses encouraging melting temperature and melting enthalpy, and its thermal stability and reliability are well approved. Therefore, we conclude that the seashell powder has the expectable competence to realize performance improvement of organic PCM for application in buildings for thermal energy storage.
研究领域:
建筑材料
·
能源储存
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2012
·
IF 3.696
Wenlong Xu,Xiaolin Wang,Zhenhuan Zhong,Aixin Song,Jingcheng Hao
The counterions, including inorganic cations, Na+ and Cs+, and organic cation, (C2H5)4N+, influence the phase behavior and self-assembled structures of the lauric acid (LA) in water. Dissolving LA in NaOH, CsOH, and (C2H5)4NOH (tetraethylammonium hydroxide, TeAOH) solutions, respectively, we observed that the three systems totally exhibited the same phase behavior, from birefringent Lα phase/precipitates (P) → Lα phase → Lα phase/L1 (micelles) → L1. The temperature influence on phase behavior was investigated, and with an increase of temperature, we observed that less phase behavior change occurred in the systems of LA/CsOH/H2O and LA/TeAOH/H2O, while the phase behavior of the LA/NaOH/H2O system exhibited an obvious change. Cryogenic transmission electron microscopy (cryo-TEM) images demonstrated that the different microstructures of Lα phase samples in the three systems existed. For the systems of LA/NaOH/H2O and LA/TeAOH/H2O, uni- and multilamellar vesicles coexist for Lα phase samples, as both the morphology and size of these vesicles are polydisperse. The curvatures of the bilayer membranes of the two systems are considered to vary from positive, zero, and even negative. However, only spherically unilamellar vesicles exist in the system of LA/CsOH/H2O, indicating that the bilayers are more rigid than those in the LA/NaOH/H2O and LA/TeAOH/H2O systems. Through the combination of the Helfrich curvature energy theory and the mass-action model, the effective bending constant K = 0.5 kBT in the LA/CsOH/H2O system was obtained, demonstrating that the unilamellar vesicles are stabilized by thermal fluctuations. A primary discussion for the effect of the nature of counterions on the stability and deformation of the vesicles is presented.
研究领域:
生物物理学
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2017
·
IF 3.444
Lipeng Han,Guixiang Ma,Shaolei Xie,Jinhe Sun,Yongzhong Jia,Yan Jing
Thermal properties and stabilities of the eutectic mixture: 1,6-hexanediol (HE) and lauric acid (LA) as a new phase change material (PCM) for latent heat thermal energy storage (TES) were investigated. Differential scanning calorimetry (DSC) results indicated that the aforementioned HE/LA mixture with eutectic composition (70/30 wt.%) was a suitable PCM in terms of melting point ( T peak = 36.92 ± 0.71 °C) and latent heat of fusion (Δ H m = 177.11 ± 7.93 J g −1 ). After 1000 thermal cycles, the change in melting point for the eutectic mixture was in the range of −0.49% to −1.19%, and the change in latent heat of fusion was in the range of −0.22% to −3.24%. The eutectic mixture was thermally and chemically stable according to results of thermogravimetric analysis (TGA), volatile test and Fourier Transform Infrared (FT-IR) spectroscopic analysis. Therefore, the HE/LA eutectic mixture is an effective TES material to reduce energy consumption.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 4
·3288-3294
·
IF 1.556
Zhu Hua,Zhang Peng,Meng Zhaonan,Li Ming
The eutectic mixture of lauric acid (LA) and stearic acid (SA) is a desirable phase change material (PCM) due to the constant melting temperature and large latent heat. However, its poor thermal conductivity has hampered its broad utilization. In the present study, pure LA, SA and the
mixtures with various mass fractions of LA–SA were used as the basic PCMs, and 10 wt% expanded graphite (EG) was added to enhance the thermal conductivities. The phase change behaviors, microstructural analysis, thermal conductivities and thermal stabilities of the mixtures of PCMs were
investigated by differential scanning calorimetry (DSC), scanning electronic microscope (SEM), transient plane source (TPS) and thermogravimetric analysis (TGA), respectively. The results show that the LA–SA binary mixture of mixture ratio of 76.3 wt%: 23.7 wt% forms an eutectic mixture,
which melts at 38.99°C and has a latent heat of 159.94 J/g. The melted fatty acids are well absorbed by the porous network of EG and they have a good thermal stability. Furthermore, poor thermal conductivities can be well enhanced by the addition of EG.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Functional Biomaterials
·
2025
·Vol. 16
·期 4
·124
·
IF 5.2
Wei Shen,Qilian Ye,Hongbo Zhang,Shenghong Xie,Shiqi Xie,Cailian Chen,Jinying Liu,Zhengwei Huang,Hai-Bin Luo,Ling Guo
Psoriasis is a chronic and recurrent inflammatory disease driven not only by intrinsic factors such as immune system dysregulation but also by external factors, including bacterial infections. In contrast to the control of a single pathogenic pathway, combination therapies addressing both the immune and infectious components of psoriasis pathogenesis may offer a more effective strategy for controlling its progression. In this study, we developed a sprayable hydrogel incorporating tea polyphenol-loaded lauric acid liposomes (TP@LA-Lipo gel) to investigate its anti-inflammatory and antibacterial role in psoriasis. Our results demonstrated that TP@LA-Lipo modulated macrophage activity, reduced the expression of iNOS and TNF-α, and remodeled the immune microenvironment. Meanwhile, TP@LA-Lipo effectively eliminated Staphylococcus aureus and Escherichia coli through membrane disruption, mitigating the provoked inflammatory response. More importantly, TP@LA-Lipo gel, when sprayed onto the psoriasis lesions, provided sustained drug release over three days, enabling deeper penetration through the thickened stratum corneum to reach the inflamed layers beneath. Furthermore, in an imiquimod-induced psoriasis mouse model, TP@LA-Lipo gel effectively restored the damaged skin, alleviated histopathological changes, and reduced the systemic immune response. In summary, these findings indicate that TP@LA-Lipo gel offers a comprehensive strategy for effective disease management and improving the quality of life for psoriasis patients.
研究领域:
皮肤病学
·
药剂学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2014
·Vol. 113
·期 1
·211-223
·
IF 0.983
Wang Chenwei,Gui Xia,Yun Zhi
A new activated carbon catalyst (AC) with relatively high density of –SO 3 H group was synthesized by HNO 3 oxidation followed by sulfonation with H 2 SO 4 . After 10 wt% HNO 3 oxidation for 8 h and subsequent sulfonation for 15 h, the total acid density and the density of the –SO 3 H group in AC were determined by titration to be 4.43 mmol/g and 0.93 mmol/g, respectively. The resulting AC exhibited relatively high catalytic performance for the esterification of lauric and oleic acid in methanol, which was due to an obvious increasing of –SO 3 H group density. In the meantime, the catalytic performance correlated with density of total acidity and esterification rates was also revealed.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Junshuai Chen,Ying Zhang,Taotao Zhan,Qi Zhou,Tian Lan,Maogang He
Methyl caprylate is expected to be one of the main components of biodiesel due to its high cetane number and good oxidation stability. Details of the experimental speeds of sound in methyl caprylate are very scarce, especially in high-temperature regions. Therefore, the speed of sound in liquid methyl caprylate was measured by the Brillouin light scattering method in the temperature range of 298.22–608.38 K and at pressures of up to 10 MPa. The relative expanded uncertainty of the speed of sound is estimated to be less than 1.32% (coverage factor k = 2). The variation of the speed of sound with the temperature and pressure was analyzed. Besides, the correlation for the speed of sound as a function of temperature and pressure is presented based on the experimental data. The absolute average of relative deviation between the experimental data and the calculated results is 0.29%.
研究领域:
物理化学
·
能源科学
✓ 已验证
产品关联
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
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Han-Qiao Hu,Yue Zhang,Ming Fan,Yong Cai,Guang-Wen Chu,Liang-Liang Zhang
Glycerol monolaurate (GML) is a widely used industrial chemical with excellent emulsification and antibacterial effect. The direct esterification of glycerol with lauric acid is the main method to synthesize GML. In this work, the kinetic process of direct esterification was systematically studied using p-toluenesulfonic acid as catalyst. A complete kinetic model of consecutive esterification reaction has been established, and the kinetic equation of acid catalysis was deduced. The isomerization reactions of GML and Glycerol dilaurate were investigated. It was found that the reaction was an equilibrium reaction and the reaction rate was faster than the esterification reaction. The kinetic equations of the consecutive esterification reaction were obtained by experiments as and . The kinetic results are beneficial to the optimization of operating conditions and reactor design in GML production process.
研究领域:
化学工程
·
有机化学
·
过程工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yize Yin,Wenchao Liu,Linlin Li,Weiwei Cao,Junliang Chen,Linlin Zhao,Xiaofei Sun,Xu Duan,Guangyue Ren
This article investigates the effect of different microwave powers on the crosslinking behavior and microwave freeze-drying characteristics of wheat starch-lauroyl arginate complex during the microwave freeze-drying process. During microwave freeze-drying, as microwave power increased from 0.1 W/g to 0.9 W/g, the freeze-drying time of WS-LA was reduced by 50 %, while the uniformity of freeze-drying was not affected by its composition. In the research results obtained from DSC, Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and SEM analyses, with the microwave power increased from 0.1 W/g to 0.9 W/g, the enthalpy value of the melting peak of the WS-LA (wheat starch-lauric acid) composite decreased from 1.15 J/g to 0.62 J/g. The full width at half maximum (FWHM) value increased from 25.6 to 30.79. The ratio of absorbance at 1022/995 cm −1 increased from 1.0111 to 1.0707. The recrystallization (RC) value decreased from 8.77 % to 0.07 %. Additionally, in the microstructure, the size of WS-LA composite particles decreased accordingly. The above findings indicated that the increase in microwave power during microwave freeze-drying had a negative impact on the formation of the WS-LA complex and the ordering of its structure in the sample.
研究领域:
食品科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Ming Yang,Han Gao,Hongtao Zou,Di Sun
The preparation of biobased coated controlled-release fertilizers by bio-derived materials was crucial for green and sustainable development in agricultural production. Yet, considerable endeavors were still urgently needed to be devoted to improving the unwanted flaws of biobased materials, i.e. high hydrophilicity and abundant micro-pores. Herein, single- and dual-modified coated fertilizers were successfully developed based on all-biobased coating materials. The characteristics of the unmodified and modified coated fertilizers were also compared. The results indicated that the outermost layer modification by lauric acid copper improved the hydrophobicity and swelling capacity of the all-biobased membrane, prolonging nitrogen release period by 53 days. The water contact angle of dual modified fertilizer by siloxane and nano lauric acid cooper attained 105° and its swelling volume was relatively larger, which contributed to a longer nitrogen release longevity (112 days). Therefore, the dual modification showed more efficiency in improving the controlled-release ability and simultaneously simplified the preparation technology. Besides, compared to the single modification, this strategy decreased the nanomaterial dose and then lowered the potential environmental risk of long-term use of nanomaterial. The novel modification technique and dual-modified all biomembrane material could provide guidance for the future development of renewable and environmentally friendly coated fertilizers.
研究领域:
农业科学
·
材料科学
·
环境科学
✓ 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）