Model Fitting and Analysis of Dielectric Properties in Alcohol-Fuel Blends Using Terahertz and Gigahertz Spectroscopies

Alcohols from biological waste sources or renewable electricity (electrofuels) are gaining attention in hard-to-decarbonize sectors such as transport. Adding alcohol to conventional fuels has positive environmental effects on automotive applications, requiring minimal engine adjustments. Employing a...

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Bibliographic Details
Published inApplied spectroscopy Vol. 79; no. 7; p. 1056
Main Authors Cova-Bonillo, Alexis, Patiño-Camino, Rayda, Brinklow, George, Lapuerta, Magín, Rodríguez-Fernández, José, Melillo, Jorge H, Cerveny, Silvina
Format Journal Article
LanguageEnglish
Published United States 01.07.2025
Subjects
THz spectroscopy
terahertz
diesel fuels
gigahertz
Debye relaxation
GHz spectroscopy
dielectric constant
Alcohols
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ISSN1943-3530
DOI10.1177/00037028241298300

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Summary:Alcohols from biological waste sources or renewable electricity (electrofuels) are gaining attention in hard-to-decarbonize sectors such as transport. Adding alcohol to conventional fuels has positive environmental effects on automotive applications, requiring minimal engine adjustments. Employing a combination of terahertz (THz) and gigahertz (GHz) spectroscopies, a comprehensive analysis of model fitting is presented for diesel-like fuels, pure alcohols (ethanol and n-butanol), and alcohol-fuel blends. Through the integration of data from both spectroscopic techniques, new Debye parameters are introduced to improve the accuracy of fitting for various fuels. This research demonstrates that THz spectroscopy alone is valuable for reasonable fits, particularly for alcohols. However, integrating THz and GHz spectroscopies leads to improved fitting, and to better potential to understand the behavior of fuel properties. In addition, the effect of alcohol concentration on the dielectric constant spectra in blends was investigated, highlighting the importance of molecular interactions. The results reveal a linear relationship between fitted parameters and alcohol content in the blends. However, the study acknowledges limitations, including challenges in achieving satisfactory fits at low alcohol concentrations and the necessity for assumptions in the modeling process. These findings provide a basis for future research and advances in fuel property modeling.
ISSN:1943-3530
DOI:10.1177/00037028241298300