ENERGY
·
2020
·
IF 6.082
Jie Ding,Xiaodong Wu,Xiaodong Shen,Sheng Cui,Xiangbao Chen
In this work, palmitic acid (PA) is used as the PCM , while a novel kind of 3D porous carbon/silica composite aerogel (CSA) is involved as porous supporting material to prepare the form-stable PCM composites (PA/CSA). The carbon aerogel supported PCM composite (CA/PA) is provided as control. PCM infiltration mainly occurs for the large pores rather than micropores or mesopores. PA molecules are physically well combined with CA and CSA due to capillary force and surface tension. The addition of amorphous CA and CSA limits the crystalline growth of PA molecules. The CA/PA shows a separated and layered structure while the CSA/PA presents a CSA@PA core-shell structure with a rough surface due to large pores within the CSA pore matrix. The PCM loading mass fraction of CSA/PA (82.2%) is much larger than that of CA/PA (64.1%), and liquid leakage test indicates its excellent form-stabilization property. The melting point and melting latent heat of CA/PA sample is 39.73 °C and 96.27 J/g, respectively, while the melting latent heat of the CSA/PA sample is as high as 187.7 J/g. The CSA/PA possesses excellent thermal stability during cycling test and its short-term thermal insulation property has also been verified in this study.
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 CEREAL SCIENCE
·
2013
·
IF 2.088
Shuang Meng,Ying Ma,Da-Wen Sun,Lifeng Wang,Tianyi Liu
Aqueous mixtures of defatted corn starch and palmitic acid were heated and high pressure homogenized in order to form amylose inclusion complexes. The effects of homogenization pressure (0–120 MPa) and palmitic acid concentration (0.5–8% based on starch content) on starch-palmitic acid complex formation as well as on complex index, X-ray diffraction, thermal properties, viscosity and particle size were investigated. Complex index increased with an increase in the amount of palmitic acid and homogenization pressure, and reached a maximum value (about 60%) when the fatty acid content was 4% and the homogenization pressure was 100 MPa. X-ray diffraction patterns indicated the formation of V-helical complexes between starch and palmitic acid. This technology could prospectively be used in prepared starch-lipid complexes.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 64
·40581-40590
·
IF 3.108
Xiao Fang,Yanchun Shi,Kejing Wu,Junmei Liang,Yulong Wu,Mingde Yang
The addition of phosphotungstic acid (PTA) to the synthesis mixture of PdCu@FeIII–MOF-5 yields the direct encapsulation of PTA inside the MOF structure (i.e. PTA@PdCu@FeIII–MOF-5) through a facile solvothermal approach. The deoxygenation reaction of palmitic acid has been investigated over PdCu@FeIII–MOF-5 and PTA@PdCu@FeIII–MOF-5 under a hydrogen atmosphere in the supercritical fluid (SCF) of n-hexane. The results showed that palmitic acid can be converted completely at 240 °C on PTA@PdCu@FeIII–MOF-5 with a high selectivity of hexadecane. Owning to the improvement of acidity of the MOF catalyst by the encapsulation of PTA inside the hollow octahedral nanostructures of PdCu@FeIII–MOF-5, the selectivity for hexadecane over the PTA@PdCu@FeIII–MOF-5 catalyst is higher than that over PdCu@FeIII–MOF-5. The excellent performance in the catalytic hydrodeoxygenation (HDO) of palmitic acid is associated with the synergistic effect between yolk–shell PTA@PdCu@FeIII–MOF-5 nanostructures and SCF medium.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2020
·
IF 3.067
Liang Gao,Xinyi Cheng,Xuwei Yu,Xiaosan Wang,Qingzhe Jin,Xingguo Wang
1-Oleoyl-2-palmitoyl-3-linoleoylglycerol (OPL) is a critical structured lipid in human milk fat and it plays an important role in infants' health. The development of an efficient method for such compound preparation is necessary. In this study, one- and two-step methods for OPL production by enzymatic acidolysis of fractionated palm stearin with mixed acids were compared in solvent-free and solvent systems. The results demonstrated that in the solvent system, the OPL contents by the one- and two-step methods were 45.8% and 56.7%, respectively. In the solvent-free system, the one- and two-step methods resulted in the formation of 43.7% and 54.8% OPL, respectively. Subsequently, acidolysis conditions of the two-step method were optimized. Under the optimum conditions, the content of OPL was 57.7%, and 83.2% of palmitic acid was at the sn-2 position . The prepared OPL has potential to be applied in infant formulas.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 104
·102003-102009
·
IF 3.289
Yong-Gang Zhang,Ying-Jie Zhu,Feng Chen,Tuan-Wei Sun,Ying-Ying Jiang
For the first time, ultralong hydroxyapatite (HAP) nanowires with lengths longer than 200 μm are used to fabricate highly porous HAP ceramics using palmitic acid spheres as pore formers. The effects of the aspect ratio of HAP and the addition amount of palmitic acid spheres on the formation of HAP porous ceramics are investigated and compared with commercial HAP nanoparticles. The ultralong HAP nanowires can cross-link with each other, leading to much stronger interaction among HAP nanowires than HAP nanoparticles. During the sintering process, although palmitic acid spheres are decomposed at high temperatures, ultralong HAP nanowires can be well preserved and still support the whole porous structure stably, leading to the formation of highly porous HAP ceramics with high biocompatibility. The porosity of the HAP nanowire porous ceramics can be easily tuned. The as-prepared HAP nanowire porous ceramics exhibit good biocompatibility, good performance for cell adhesion and spreading, and cell proliferation. Thus, the as-prepared HAP nanowire porous ceramics are promising for applications in various biomedical fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Jinlei Chen,Dechao Wang,Fenqiang Luo,Xinyu Yang,Xingyong Li,Shuirong Li,Yueyuan Ye,Duo Wang,Zhifeng Zheng
Production of valuable chemicals and fuels from waste animal fat and vegetable oils can serve as alternatives to fossil energy. In this study, the selective production of alkanes and higher fatty alcohol via hydrodeoxygenation (HDO) of palmitic acid over red mud-supported nickel catalysts (Ni/RM) was reported. Meanwhile, the study has investigated the effect of Ni loading, reaction temperature, hydrogen pressure on the HDO of palmitic acid, analyzed the reusability of Ni/RM and explored the possible reaction mechanism. The results show that palmitic acid is completely converted over 7%Ni/RM. The selectivity of fatty alcohol and alkanes are 92.54% (260 °C) and 100% (300 °C), respectively. Ni/RM has shown the highest catalytic performance as compared to commercial Ni/SiO 2 and Ni/γ-Al 2 O 3 catalysts. The 7%Ni/RM also demonstrates stable catalytic performance after multiple times of reuse. Moreover, hexadecanol plays an important role in hydrodeoxygenation, decarbonylation, and decarboxylation routes.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 50
·30087-30093
·
IF 3.119
Shaoxia Shi,Yaoyao Dong,Qi Li,Tingting Liu,Xiuzhu Yu
This work aimed to determine the changes in the morphology, complexation degree, the structural, thermal, and rheological properties of starch–fatty acid complexes during steam cooking. In this study, wheat starch with certain water and palmitic acid contents were steamed for 0.5, 1, 1.5, 2, and 2.5 h. The complexing index (CI) first decreased and then progressively increased with the prolonging of steam cooking time. The decrease in CI was associated with the decomposition of the complex layer formed on the granule surface at 0.5 h of steam cooking. The interaction between wheat starch and palmitic acid led to the change of starch crystal type. Prolonging treatment time promoted thermal stability and structural order degree. The type I and IIa complexes reached saturation and fatty acids in the interstitial space between helices increased with excessive treatment times. Rheological behavior analysis showed that the viscoelasticity and deformation degree of samples decreased and increased, respectively, with increasing steam cooking time. Results showed that the thermostability and order degree of the complex layer were lower than those of samples with long treatment times and complexing was effective during steam cooking.
研究领域:
食品科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Cities and Society
·
2018
·
IF 3.073
Nan Zhang,Yanxia Du
In this work, ultrasonic is firstly used to enhance the heat transfer rate of palmitic acid-stearic acid eutectic mixture (PA-SA) in a cylindrical stainless-steel unit. The heating boundary condition of the phase change material (PCM) is constant wall temperature condition in this work. The effects of ultrasonic parameters including ultrasonic power and operation time on heat transfer enhancement of PA-SA are experimentally studied. The results show that the heat transfer rate in melting process of PA-SA increases with the increasing of ultrasonic power, Specifically, heat transfer rate is increased by 10.64%, 23.40% and 31.91% at the ultrasonic power of 60 W, 105 W and 150 W respectively. The heat transfer rate of PA-SA is also increased with the increasing of ultrasonic action time. Effect of ultrasonic on heat transfer enhancement varies in terms of different ultrasonic action stage of the charging process. Therefore, the optimal effect of ultrasonic on heat transfer enhancement can be obtained by using intermittence ultrasonic. In conclusion, it is an effective way to enhance the heat transfer of PCM used in the latent heat storage system by intruding ultrasonic.
研究领域:
能源工程
·
传热学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Shu Yang,Xueping Zhang,Ahmed S.M. Saleh,Lishuang Wang,Yumin Duan,Zhigang Xiao
Edible oil-based oleogels provide a viable and healthier alternative to traditional saturated fats. This study aimed to develop oleogels using rice bran oil combined with β-Sitosterol (Sit) and Palmitic Acid (PA). Structural, physicochemical, and rheological properties of the prepared oleogels were investigated. The results showed that Sit alone was insufficient to create a stable oleogel. However, when Sit was combined with PA, a firm and stable oleogel was obtained. The gel network was formed and stabilized through physical non-covalent interactions such as hydrogen bonding. Additionally, x-ray diffraction analysis indicated that the oleogel molecules rearranged and underwent a homogeneous polycrystalline transition due to the different gelator combinations, revealing the coexistence of β and β′ crystal types in the oleogels. Moreover, the firmness and oil binding capacity of the oleogels increased with higher PA content in the gelator mixture. Furthermore, the storage modulus (G′) and loss modulus (G″) were frequency-independent, with G′ significantly higher than G". The results suggest that fat-like oleogel can be produced using a combination of Sit and PA at mass ratios of Sit2:PA3 or Sit1:PA4 (w/w).
研究领域:
食品科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Qi Wang,Jinlei Chen,Xingyong Li,Xinyu Yang,Yankun Wu,Shuirong Li,Yueyuan Ye,Duo Wang,Dechao Wang,Zhifeng Zheng
Red mud (RM) is a strongly solid waste from alumina production, and the disposal of RM leads to series of environmental problems such as alkalization of occupied land and pollution of nearby water systems. Using RM as catalyst or carrier is one of the important methods for the comprehensive utilization of RM. Herein, the application of Ni supported RM (Ni/RM) for the efficient hydrodeoxygenation (HDO) of waste oils to produce hydrocarbon-based biofuels is reported. The structural properties of Ni/RM catalysts were investigated. The catalytic performance for HDO of palmitic acid as the model compound was evaluated. The results showed that RM calcinated at low temperature (400–600 °C) has a larger specific surface area and well dispersion of Ni, while the high calcination temperature (700 °C ~ 900 °C) results in sintering of metal oxides and lower dispersion of Ni. Ni/RM-500 shows the largest specific surface area of 77 m 2 /g. The conversion of palmitic acid over Ni/RM-500 is 100% at 250 °C, and alkanes are the only products at 300 °C. The reaction path of HDO and DCO/DCO 2 is related to reaction temperature. The Ni/RM-500 shows the feasibility to different feedstocks. Finally, the catalytic performance of Ni/RM-500 was tested for 135 h, and the main reason causing the deactivation of Ni/RM-500 was revealed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Junmei Liang,Qicheng Zhang,Haibo Zhao,Shaolei Zhao,Yulong Wu,Xiaobin Fan
Hydrodeoxygenation (HDO) of fatty acids to alkanes is key to convert renewable resources into biofuels. Here, we design a new Ti3C2Tx MXene-confined Ni catalyst with extraordinary catalytic performance in the HDO of palmitic acid. Due to the large two-dimensional surface and chemical activity, Ti3C2Tx MXene is able to disperse and anchor Ni particles through strong synergistic coupling. As a consequence, the obtained Ni/Ti3C2Tx catalyst exhibits excellent catalytic performance with a complete conversion of palmitic acid. It can be recycled in five runs without activity reduction, demonstrating good stability of the as-prepared catalyst. The facilitated catalytic performance can be ascribed to the synergic effect of metal Ni and Ti3C2Tx MXene. Ti3C2Tx MXene facilitates the adsorption and conversion of palmitic acid to aldehyde. The dispersed Ni particles benefit from the hydrogenation of hexadecanal intermediate with the cleavage of C–C bonds and the dehydration–hydrogenation of hexadecanol to form alkanes.
研究领域:
催化化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Atmospheric Pollution Research
·
2022
·
IF 4.831
Zhanghua Liu,Jianbing Su,Aojuan Ma,Aixue Zhu,Pengyan Liu
In this study, the following 5 kinds of tracer pollutants of cooking oil fumes were selected: palmitic acid , stearic acid , cholesterol, stigmasterol and β-sitosterol, and an effective method of their extraction, separation, enrichment and determination was established considering the conditions of the low-altitude exhaust and the condensation of cooking fumes. Five tracer pollutants were determined both in the PM 2.5 and gas phases from college canteen exhaust and in waste oil condensed from fumes of different edible oils in households. It was found that the amount of palmitic acid was higher than that of stearic acid in the same sample; the emission characteristics of 5 substances in condensed grease samples from different oils varied considerably; compared with palmitic acid and stearic acid, 3 sterols (cholesterol, stigmasterol and β-sitosterol) are more characteristic as tracers of cooking oil fumes. The results provide technical and methodological references for the contribution and traceability analysis of catering source exhaust in air pollution source apportionment .
研究领域:
环境科学
·
分析化学
✓ 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）