Dielectric properties of fuel oils and their ethanol mixtures investigated by terahertz time-domain spectroscopy

Download

index.pdf

Date

2013

Author

Arık, Enis

Metadata

Show full item record

Item Usage Stats

176
views

59
downloads

The purpose of this study is to investigate the dielectric properties of fuel oils and their ethanol mixtures in the THz spectral region. We presented frequency dependent absorption coefficients, refractive indices, and dielectric constants calculated from the measurements of pure and mixtures of fuel oils. As the mixing ratio changes, meaningful shifts were observed in refractive index and absorption coefficient of the mixtures. For pure liquids, we used Debye model which provides a good estimate for the dielectric parameters of pure liquids in microwave region and also in the THz region. Bruggeman model, which is used for describing the interaction between liquids in binary mixtures, did not work for ethanol mixtures of gasoline within our assumptions. However, these mixtures were modeled successfully with a modified Debye model in which the mixture behavior was described with a basic contribution approach. The results suggest that there is no strong interaction between the ethanol and the molecules in the gasoline. We concluded that this new approach offers a simple and useful method to determine the concentration of ethanol in gasoline with 3% (by volume) maximum error.

Subject Keywords

Terahertz spectroscopy., Petroleum as fuel., Ethanol as fuel., Dielectrics.

URI

http://etd.lib.metu.edu.tr/upload/12615463/index.pdf
https://hdl.handle.net/11511/22424

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Hydrate formation conditions of methane hydrogen sulfide mixtures Bülbül, Sevtaç; Mehmetoğlu, Mustafa Tanju; Department of Petroleum and Natural Gas Engineering (2007) The objective of this study is to determine hydrate formation conditions of methane- hydrogen sulfide mixtures. During the study, an experimental work is carried out by using a system that contains a high-pressure hydrate formation cell and pressure-temperature data is recorded in each experiment. Different H2S concentrations and both brine and distilled water are used in the experiments and the Black Sea conditions, which are suitable for methane-hydrogen sulfide hydrate formation are examined. Considering...
Adsorption of Cd(II) ions from aqueous solutions using activated carbon prepared from olive stone by ZnCl2 activation Kula, Ibrahim; Ugurlu, Mehmet; Karaoglu, M. Hamdi; Celik, Ali (2008-02-01) This study is aimed to remove Cd(II) ions from aqueous solutions by adsorption. As adsorbent, activated carbon prepared from olive stone, an agricultural solid by-product was used. Different activating agent (ZnCl2) amounts and adsorbent particle size were studied to optimize adsorbent surface area. The adsorption experiments were conducted at different parameters such as, adsorbent dose, temperature, equilibrium time and pH. According to the experiments results, the equilibrium time, optimum pH, adsorbent ...
Thermal characterization and model-free kinetics of biodiesel sample Kök, Mustafa Verşan (2015-11-01) In this study, combustion and pyrolysis behaviours of methanol route biodiesel were investigated using thermal analysis techniques known as simultaneous thermogravimetry and differential scanning calorimetry (DSC) at different heating rates. Reaction regions, peak temperatures, mass loss and heat flow rates of the biodiesel sample are determined using TG-DTG and DSC data. It was found that as the heating rate of the reactions increased, peak temperatures of the reactions shifted higher temperatures, implyin...
DRIFT studies for the reaction and adsorption of alcohols and isobutylene on acidic resin catalysts and the mechanism of ETBE and MTBE synthesis Doğu, Timur; Aydin, E; Oktar, N; Murtezaoglu, K; Dogu, G (2001-11-14) Diffuse reflectance FT-IR spectra of methanol and ethanol on Amberlyst 15 and on a synthesized acidic resin catalyst indicate that alcohol molecules are adsorbed by forming hydrogen bridges with the -SO3H sites of the catalyst and among themselves. Some of the alcohol molecules were found to be strongly chemisorbed by dissociation of one or two hydrogen atoms. Isobutylene was also found to be strongly adsorbed by forming a bridged structure between the adsorbed alcohol molecules and the -SO3H groups. DRIFT ...
Highly Efficient Room Temperature Synthesis of Silver-Doped Zinc Oxide (ZnO:Ag) Nanoparticles: Structural, Optical, and Photocatalytic Properties Yildirim, Ozlem Altintas; Ünalan, Hüsnü Emrah; Durucan, Caner (Wiley, 2013-03-01) Synthesis of silver-doped zinc oxide (ZnO:Ag) nanoparticles through precipitation method has been reported. The synthesis was conducted at room temperature and no subsequent thermal treatment was applied. ZnO nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), fourier transmission infrared spectroscopy (FTIR), and ultraviolet-visible (UVVis) spectroscopy. Detailed crystallographic investigation was accomplished through ...

Citation Formats

E. Arık, “Dielectric properties of fuel oils and their ethanol mixtures investigated by terahertz time-domain spectroscopy,” M.S. - Master of Science, Middle East Technical University, 2013.