High Pressure Rheology of Environmentally Friendly Vegetable Oils

Mawatari, Toshifumi; Fukuda, Ryusei; Mori, Hideki; Mia, Sobahan; Ohno, Nobuyoshi

doi:10.1007/s11249-013-0180-4

Cited by 20 publications

(7 citation statements)

References 12 publications

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“…The pressure–viscosity coefficient of sunflower oil is α 2 = 11.9 GPa –1 , which cannot be ignored. Therefore, the minimum film thickness can be estimated by the Hamrock–Dowson formula (eq ), h 0 = 17.46 nm.…”

Section: Resultsmentioning

confidence: 99%

Synthetic Kilogram Carbon Dots for Superior Friction Reduction and Antiwear Additives

et al. 2022

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Because of the high synthesis cost, strong chemical inertness, complex process, and easy to endanger environment of traditional carbon-based nanolubricant additives, the development of its application in lubrication is limited. Therefore, a new type of lubricant additive with low cost, high yield, high performance, and environmental protection is urgently needed. Herein, a kilogram-scale carbon dots (CDs) lubricant additive was prepared by a simple and green one-step reaction of aldol condensation, which showed excellent lubricating properties in water and sunflower oil. The tribological properties of the CDs lubricant additive at different concentrations, loads, and speeds were systematically studied. The results show that the average friction coefficient of water is significantly reduced by 75% by a CDs lubricant additive. In particular, CDs not only exhibited excellent service life and lubrication stability during friction but also kept the friction coefficient change rate of sunflower seed oil close to 0 within 500 min. According to the tribological evaluation and wear surface analysis, the lubrication mechanism of CDs was attributed to their own morphological characteristics and abundant oxygen-containing functional groups on the surface. In the friction process, the charge adsorption effect, the adsorption protective film, and the hydrogen bonding layer are generated, which play an essential role in obvious antiwear and friction reduction. Therefore, this work provides a reference for the preparation of high-performance and high-yield lubricant additives.

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Section: Resultsmentioning

confidence: 99%

Synthetic Kilogram Carbon Dots for Superior Friction Reduction and Antiwear Additives

et al. 2022

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“…Результаты по вязкости масел при высоких давлениях представлены в [94][95][96]. В [94] сообщается об экспериментальных исследованиях вязкости оливкового масла и составляющих его жирных кислот с использованием вискозиметра высокого давления погружного типа при температуре 293,15 К и давлений 0,101 -45 МПа.…”

Section: динамическая и кинематическая вязкости маселunclassified

“…Эти уравнения обеспечили хорошее соответствие с экспериментальными данными: экспоненциальное соотношение имеет стандартное отклонение 3,32 % и квадратичное соотношение имеет стандартное отклонение 1,93 %. Mawatari [96] исследовали влияние давления на вязкость и характеристики затвердевания рапсового масла, соевого масла, подсолнечного масла, пальмового масла, кокосового масла, оливкового масла, камелии, горчичного масла, касторового масла, метилового эфира рапса и метилового эфира сои в интервале температур от 293 К до 383 К и давлений до 0,35 ГПа. Для определения вязкости при высоком давлении до 0,35 ГПа и при температуре от 293 К до 383 К растительных масел использовался вискозиметр с падающим шариком высокого давления.…”

Section: динамическая и кинематическая вязкости маселunclassified

Biodiesel fuel. part ii. thermophysical properties of systems participated in the process of obtaining biodiesel fuel using working media in the supercritical fluid state

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et al. 2022

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE PURPOSE. The purpose of the work was to systematize the results of the work of domestic and foreign authors on the thermophysical properties of media and substances involved in the process of obtaining biodiesel fuel. METHODS. To measure the isobaric heat capacity, the predominant use is given to the methods of heat-conducting and scanning calorimeters, the measurement of the thermal conductivity by the heated filament method. Kinematic and dynamic viscosities are measured, respectively, on standard glass viscometers at atmospheric pressure and by the drop weight method. RESULTS. The results of a study of a wide range of thermophysical properties of thermodynamic systems involved in the process of obtaining biodiesel fuel under supercritical fluid conditions are presented. Attention is paid to the density, isobaric heat capacity, thermal conductivity, dynamic and kinematic viscosity of both the feedstock and the resulting biodiesel fuel, presented in a wide range of temperature and pressure changes, including nearcritical, as well as taking into account the thermal effects caused by the dissolution and change in the structures of substances under the influence of fluid reagent. CONCLUSION. The presented data will be necessary at the stages of designing and scaling a particular technology for the production of biodiesel fuel, both on a laboratory scale and at an industrial level.

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“…The NLC particles displayed a spherical shape and particle sizes in the nano range. We can observe a typical solid-liquid lipid combination, where a fraction of the liquid lipid attached to the surface of the solid matrix as a liquid film or a liquid droplet forming NLCs, which facilitates incorporation of bioactive compounds and influences particle size [43,44]. As for NLC-SF (SL:LL = 60:40), a smaller size was observed compared to NLC-SF (SL:LL = 40:60), with mean diameters of 157.6 ± 4.31 nm and 160.5 ± 13.6 nm, respectively (Figure 1).…”

Section: Surfactant Concentration Influence Stability Of the Systemmentioning

confidence: 99%

Biocompatibility and Antimicrobial Activity of Nanostructured Lipid Carriers for Topical Applications Are Affected by Type of Oils Used in Their Composition

et al. 2021

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Nanostructured lipid carriers (NLCs) have gained significant attention as tools for the dermal delivery of therapeutics due to their stability, biocompatibility, and ability to improve drug bioavailability. The use of natural plant oils (NPO) in NLC formulations has numerous benefits for the skin due to their therapeutic potential. This work shows the effect of NLC composition on bioavailability in epidermal cells and antimicrobial activity against Staphylococcus aureus. Sixteen systems containing fixed (sunflower, olive, corn, peanut, coconut, castor, and sweet almond) and essential (eucalyptus) oils, with different solid lipid (SL): liquid lipid (LL) ratios, were engineered. The structural properties, bioavailability, and antimicrobial action of the particles was studied. The choice of NPO influenced the physicochemical stability by changing the diameter of NLC formulations (between 160 nm and 185 nm) and Z-potential (between −46 mV and −61 mV). All of the systems were characterized by concentration-dependent cytocompatibility with human epidermal keratinocytes (HaCaT) and human dermal fibroblasts (HDFn). The SL:LL ratio in some NLC systems impacted cell cytotoxicity differently. Antimicrobial properties were observed in all 16 systems; however, the type of oil and SL:LL ratio affected the activity of the formulations. Two NLC-NPO systems were found to be non-cytotoxic to human cells lines at concentrations that completely inhibited bacterial growth. These results present a strong argument that the use of natural oils in NLC formulations presents a promising tool for the treatment of skin infections.

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High Pressure Rheology of Environmentally Friendly Vegetable Oils

Cited by 20 publications

References 12 publications

Synthetic Kilogram Carbon Dots for Superior Friction Reduction and Antiwear Additives

Synthetic Kilogram Carbon Dots for Superior Friction Reduction and Antiwear Additives

Biodiesel fuel. part ii. thermophysical properties of systems participated in the process of obtaining biodiesel fuel using working media in the supercritical fluid state

Biocompatibility and Antimicrobial Activity of Nanostructured Lipid Carriers for Topical Applications Are Affected by Type of Oils Used in Their Composition

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