Relevant bibliographies by topics / Ecuación De Vogel-Fulcher-Tamman (vft)

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Academic literature on the topic 'Ecuación De Vogel-Fulcher-Tamman (vft)'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Ecuación De Vogel-Fulcher-Tamman (vft)"

1

Tian, Jianxiang, Laibin Zhang, and Mengmeng Zheng. "A new correlation in predicting temperature-dependent viscosity of saturated liquids." Modern Physics Letters B 31, no. 02 (January 20, 2017): 1750014. http://dx.doi.org/10.1142/s0217984917500142.

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The Vogel–Fulcher–Tamman (VFT) correlation is the known most accurate equation used to estimate and predict temperature-dependent viscosity of fluids. But its accuracy analysis for saturated liquids is still unknown. In this paper, we checked its ability for 49 saturated liquids by using the data in the National Institute of Standards and Technology (NIST) Webbook. Through detailed accuracy analysis, we found that the VFT correlation works qualitatively but does not work well quantitavely. We shown the temperature ranges in which the VFT correlation holds for absolute average deviations (AADs) of [Formula: see text][Formula: see text]1%, [Formula: see text][Formula: see text]2% and [Formula: see text][Formula: see text]5%. The corresponding coefficients are also obtained for engineers to use it directly. We also proposed a new four-parameter correlation to improve the predictive ability. We show that the new correlation holds for 5 fluids with AAD [Formula: see text] 1%, 37 fluids with AAD [Formula: see text] 2%, 43 fluids with AAD [Formula: see text] 3% and 48 fluids with AAD [Formula: see text] 4%.
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2

Liu, G. D., J. P. Wu, H. M. Dong, and H. Q. Zhang. "Nonlinear modification of vogel-fulcher-tamman (VFT) model and its application in enthalpy relaxation of glassy polystyrene." Journal of Non-Crystalline Solids 528 (January 2020): 119761. http://dx.doi.org/10.1016/j.jnoncrysol.2019.119761.

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3

Mohri, Tetsuo, and Yoshitaka Kobayashi. "Theoretical Study of Glass Transition Based on Cluster Variation Method." Materials Science Forum 539-543 (March 2007): 2425–30. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.2425.

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Modeling of Glass transition is attempted based on the Cluster Variation Method. Free energy functional of an L10 ordered phase is employed to describe the first order nature of the transition. Free energy contour surface calculated as a function of temperature and an order parameter which simulates an amount of defects provides a generalized stability diagram in which the ideal glass transition temperature is identified as a critical point. Transition kinetics is investigated by Path Probability Method which is the kinetics version of the CVM to time domain. Continuous cooling behavior is calculated by explicitly incorporating the temperature dependent viscosity term based on VFT (Vogel-Fulcher-Tamman) formula. The glass transition is realized as the freezing of the order parameter due to the enhanced viscosity. The extension of the present theoretical scheme to non-Bravais lattice is attempted by Continuous Cluster Variation Method.
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Smiljanic, Sonja, Snezana Grujic, Mihajlo Tosic, Vladimir Zivanovic, Srdjan Matijasevic, Jelena Nikolic, and Vladimir Topalovic. "Effect of La2O3 on the structure and the properties of strontium borate glasses." Chemical Industry and Chemical Engineering Quarterly 22, no. 1 (2016): 111–15. http://dx.doi.org/10.2298/ciceq150213031s.

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The selected lanthanum-strontium-borate glasses were prepared by a conventional melt-quenching technique. The compositions of the investigated glasses were chosen to be: 5.7, 9.5, 14.3, 19.1 mol % for La2O3, 22.9, 19.1, 14.3, 9.5 for mol % SrO and 71.4 mol % for B2O3. The density, molar volume, oxygen molar volume, oxygen packing density, oxygen/boron ratios and structural transformations in the glass network were investigated according to the substitution of SrO by La2O3. The density and the molar volume increased in parallel with La2O3 content increase. Simultaneously, oxygen molar volume values increased while the oxygen packing density values decreased. A hot stage microscope (HSM) and a differential thermal analysis (DTA) were used to determine the characteristic temperatures. By increasing the content of lanthanum, the glass transition temperatures, changed with the same trend as the molar volume. Glass stability parameters were calculated from the temperatures obtained by DTA and HSM. The HSM results were used to obtain the viscosity curves by applying Vogel-Fulcher-Tamman (VFT) equation.
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5

Tian, Jianxiang, and Laibin Zhang. "New correlation for the temperature-dependent viscosity for saturated liquids." Modern Physics Letters B 30, no. 32n33 (November 30, 2016): 1650399. http://dx.doi.org/10.1142/s0217984916503991.

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Based on the recent progress on both the temperature dependence of surface tension [H. L. Yi, J. X. Tian, A. Mulero and I. Cachading, J. Therm. Anal. Calorim. 126 (2016) 1603, and the correlation between surface tension and viscosity of liquids [J. X. Tian and A. Mulero, Ind. Eng. Chem. Res. 53 (2014) 9499], we derived a new multiple parameter correlation to describe the temperature-dependent viscosity of liquids. This correlation is verified by comparing with data from NIST Webbook for 35 saturated liquids including refrigerants, hydrocarbons and others, in a wide temperature range from the triple point temperature to the one very near to the critical temperature. Results show that this correlation predicts the NIST data with high accuracy with absolute average deviation (AAD) less than 1% for 21 liquids and more than 3% for only four liquids, and is clearly better than the popularly used Vogel–Fulcher–Tamman (VFT) correlation.
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6

Shadowspeaker, Ludi A., and Ralf Busch. "On the Fragility of Nb-Ni Based and Zr55-x Tix(CuNi)18.25+yBe26.25-y Bulk Metallic Glasses." MRS Proceedings 806 (2003). http://dx.doi.org/10.1557/proc-806-mm5.3.

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ABSTRACTThe heating rate dependencies of the glass transition temperature of the Ni65Nb35, Ni60Nb35Sn5, Ni59.35Nb34.45Sn6.2, Ni60(Nb40Ta60)34Sn6, and Ni57Fe3Nb35Sn5 metallic glass forming alloys were investigated with a differential scanning calorimeter (DSC). The relaxation time for each DSC experiment was plotted versus inverse temperature and a Vogel-Fulcher-Tamman (VFT) type relation was fitted to the data. The fragilities of the alloys were characterized with the fragility parameter, D*, and the VFT temperature, T0, which are the fit parameters from the VFT relation. It was found that for the binary alloy D* = 6.2, for the ternary alloys D* = 11.0, and that for the quaternary alloys D* was between 16.4 and 19.0. The D* increases monotonically as the number of components in the alloy is increased. This trend is also seen in Zr based alloys.
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7

Wei, Ying, Bing Wang, Zhen Zhao, Xin-yuan Zhang, Xuan-yu Wu, and Qing-Guo Zhang. "Estimation of Physico-Chemical Properties and Structure Characteristics of New Alkylimidazolium Salicylate Ionic Liquids." Zeitschrift für Physikalische Chemie 230, no. 8 (January 28, 2016). http://dx.doi.org/10.1515/zpch-2015-0576.

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AbstractTwo new ionic liquids derived from natural product salicylate, 1-methyl-3-ethylimidazolium salicylate ([Emim][Sal]) and 1,2-dimethyl-3-ethylimidazolium salicylate ([Emmim][Sal]), were synthesized and characterized. The density, surface tension, viscosity, and electrical conductivity of two ionic liquids were determined from 288.15 to 343.15 K. The physico−chemical properties of the ionic liquids were estimated from the experimental data by empiric or semi-empiric methods, such as, coefficients of thermal expansion, molecular volume, standard molar entropy, lattice energy, enthalpy of vaporization, and so on. According to the interstice model of ionic liquids, the interstice parameters like coefficients of thermal expansion and interstice volume etc. were estimated, too. The experimental results and Density Functional Theory (DFT) calculation were employed to discuss the structure characteristics caused by differences of cations/anions for properties of two ionic liquids. And by the Vogel–Fulcher–Tamman (VFT) equation, the temperature dependences of the ILs viscosities and electric conductivities were graphically described. The structures, the energetics and COSMO volumes of all investigated ions are obtained by combining DFT calculations and the COSMO–RS methodology to describe intermolecular interactions of ionic liquids.
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Dissertations / Theses on the topic "Ecuación De Vogel-Fulcher-Tamman (vft)"

1

Kong, Moreno Maynard J. "Los líquidos iónicos a temperatura ambiente (RTILs): Propiedades, aplicaciones y perspectivas futuras." Revista de Química, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/100110.

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La investigación y desarrollo de líquidos iónicos a temperatura ambiente (RTILsl va cobrando mayor importancia, como una necesidad de contar con materiales y sustancias químicas apropiados para diversos procesos químico-industriales, así como al creciente uso de ciertas fuentes alternativas de energía, más llevaderos con nuestro medio ambiente. En este artículo se hace una reseña sobre los líquidos iónicos, sus propiedades físicas y de transporte, aplicaciones presentes y futuras.
Room temperature ionic liquids (RTILs): Properties, applieations and future prospeetsResearch and development of room-temperatureionic I iquids (RTILs) is becoming more important, as a need to count with materials and chemical substances suitable for several processes in chemical industries, as well as for the growing use of alternative sources of energy, much more friendly with our environment. In this paper is presented a review on ionic liquids, their physical and transport properties, current and future applications
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