However, the nano-oil with an electric field (either DC or AC) presented an increased heat transform, and the nano-oil with an AC electric field promoted faster cooling faster than that with a DC electric field. In large quantities, industry uses oil as an insulator. <> No particle sedimentation occurred in the nano-oil after 30 d. The zeta potential of the nano-oil with BN nanoparticles, which determined the stability of the suspension, was measured by a Malvern ZS Nano S analyzer. Employing linseed oil as a matrix demonstrates an increase in electrical conductivity from 10–11 to 10–3 S/cm after only 6 days of exposure to air. The calibration uncertainty in the measuring system was below 1%. The average positive lightning impulse breakdown voltage of the nano-oil with 0.1 vol.% was 60 kV, which was 23% greater than that of pure vegetable oil. Moreover, an electric charge was generated on the surface of the nanoparticle because of the polarization under the electric field. The high viscosity of rape seed oil causes poor fuel atomization and difficulty for its ignition, additionally the physical and chemical characteristics of vegetable oils lead to imperfect evaporation of droplets that can cause severe deposits in the combustion chamber of the boiler. With degummed and refined rape seed oil a new spray nozzle was determined to avoid fouling and coking problems. ����M3��4��HK���9�Vl5�¹ � 9��+V"��eSÂ�M�OSR�i�P��׽LJ{?�I���>tO[��~u�j�o� ��Z�gW���@�c�HܰA��Z��%T��$��/�����W�)��#4p�����̤E����{����nS@k��օ�6�rX�~�b���0d�^9�Ϫ�U J�5��Y A 25°C and 55% RH environment was maintained in the experiment. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Electrical properties of vegetable oils between 20 Hz and 2 MHz. The gap distance of the electrodes was 15 mm. Vegetable oil epoxides with natural additives. As calculated by formula (2), the maximum streamer rate of nano-oil was 1.38 and 1.04 km/s for the positive and negative lightning impulses, respectively. This means we can process vegetable oils without using petrochemicals. Additives serve to fine-tune the properties to suit the given application. liquids isolants en électrothechnique-caractéristiques des produits. f the electrical resistivity and the viscosity of In the interfacial layers of solid-liquid mixtures, the degree of ordering of the liquid molecules near the solid surface was higher than that of the liquid molecules. Post was not sent - check your email addresses! These nanoparticles, which become negative ions electrons, caused the additional electric field with positive charge behind in Figure 11(b). Int. A clear positive correlation between water content and ε′r was found but not for ε"r. A. Eastman, S. U. S. Choi, S. Li, W. Yu, and L. J. Thompson, “Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles,”, R. Zheng, J. Gao, J. Wang et al., “Thermal percolation in stable graphite suspensions,”, E.-O. If a particular chemical is not listed, or if you would like application assistance with an electromagnetic flowmeter application, please feel free to contact SmartMeasurement TM ’s U.S. offices at 1-866-404-5415 for assistance. castor oil and Palm . The lighting impulse breakdown, which is a key parameter in the insulation of dielectric liquids, was measured in accordance with the IEC 60897 standard. M. Sanchez-Dominguez and C. Rodríguez-Abreu, C. A. S. Batista, R. G. Larson, and N. A. Kotov, “Nonadditivity of nanoparticle interactions,”. Viscosity of the oils is an other important physical property associated with their processing and quality control. You can unsubscribe at any time and we'll never share your details to third parties. Penetration depths are presented as a function of ε′r and ε"r, and the practical significance of the data obtained are discussed. In most cases, if the applied voltage reached the breakdown voltage, the streamer would jump to the main charge channel at a very high speed after reaching a specific length. range of 20–100°C are presented. castor oil and Palm . This phenomenon can be explained by space charge theory [23, 29]. By contrast, in the negative polarity model, the space electric field generated by the nanometer anion enhanced the electric field near the needle electrode and reduced only the electric field away from the needle electrode. Interested in research on Vegetable Oils? The positive and negative lightning impulse times of nano-oil were significantly higher than those of pure vegetable oil, and the maximum value was increased by 22.0% and 28.8% for the positive and negative cases, respectively. These polarized charges generated the electric field, which changed the original electric field. Join ResearchGate to discover and stay up-to-date with the latest research from leading experts in, Access scientific knowledge from anywhere. The intrinsic properties of natur Ettefaghi, H. Ahmadi, A. Rashidi, A. Nouralishahi, and S. S. Mohtasebi, “Preparation and thermal properties of oil-based nanofluid from multi-walled carbon nanotubes and engine oil as nano-lubricant,”, I. Jo, M. T. Pettes, J. Kim et al., “Thermal conductivity and phonon transport in suspended few-layer hexagonal boron nitride,”, J. Li, B. environmental performance and electrical and thermal characteristics, dielectric The use of this electrical approach has been made between 20 and consumption of vegetable oils for th. The intrinsic properties of natur Your opinions are important to us. Prior to the test, at least 25 mL nano-oil was placed into the tester to avoid the effects of microwater and pollutants. There is an increasing demand for green products, but for them to be genuinely sustainable, manufacturers must also use adhesives and paints that are made of bio-based feedstocks. The breakdown time of nano-oil is larger than pure oil. environmental performance and electrical and thermal characteristics, dielectric The sampling rate was 10 GS/s, and the bandwidth was 1 GHz. The experimental data on density, thermal conductivity, heat capacity, and viscos-ity of the five vegetable oils are presented, respectively, in Tables 2–5, at the different temperatures evaluated. signal, Regulating the reactivity of black phosphorous through protective chemistry, A method for replacing degraded perovskite in solar cells making them recyclable, Study of partial left femur suggests Sahelanthropus tchadensis was not a hominin after all, Observations unveil jet-like structures from the pulsar PSR J1135–6055. "Together with the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, we switched from epoxidation to a novel enzyme-based process. Oil conducts electricity better than air, so a thin layer of oil can fill in those grooves, giving electrons more room to flow. A. Tsekmes, R. Kochetov, P. H. F. Morshuis, and J. J. Smit, “Properties of mineral oil based silica nanofluids,”, Y. Permittivity decreases with temperature while conductivity increases exponentially. Apart from any fair dealing for the purpose of private study or research, no We are committed to sharing findings related to COVID-19 as quickly as possible. Consequently, the streamer was suppressed, thereby decreasing the propagation length and velocity [29, 30]. More specifically, the reader will find information in the following areas: 1) new transformations of carbohydrates to chemicals and polymers 2) novel oleochemical processes; new uses of glycerol and fatty acids 3) transition metal catalyzed transformations of carbohydrates, lignin, fatty acids, glycerol, etc. The ionization region expanded as the applied voltage increased, ultimately closing the area near the needle tip to form the streamer and the corona. © 2008-2020 ResearchGate GmbH. And with that, sustainable adhesives, coatings and even foam resins are looking to be viable options.

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