Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen

The present work investigates the contribution of asphaltene aggregation to bitumen viscosity subject to ultrasound irradiation. A West-African bitumen with a viscosity of 12043 cP at room temperature was sonicated at low (38 kHz) and mild frequency (200 kHz) under controlled gas environment includi...

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Autores principales:	Ronald Nguele, Hirokazu Okawa
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Asphaltene Bitumen viscosity Ultrasound Sonication Bitumen Chemistry QD1-999 Acoustics. Sound QC221-246
Acceso en línea:	https://doaj.org/article/9baf0862ab624f38b778097001f7be79
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spelling	oai:doaj.org-article:9baf0862ab624f38b778097001f7be792021-12-02T04:59:48ZEffect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen1350-417710.1016/j.ultsonch.2021.105811https://doaj.org/article/9baf0862ab624f38b778097001f7be792021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1350417721003539https://doaj.org/toc/1350-4177The present work investigates the contribution of asphaltene aggregation to bitumen viscosity subject to ultrasound irradiation. A West-African bitumen with a viscosity of 12043 cP at room temperature was sonicated at low (38 kHz) and mild frequency (200 kHz) under controlled gas environment including air, nitrogen (N2) and carbon dioxide (CO2). The rheology of the bitumen, asphaltene content analyses as well as spectral studies were conducted. Herein was found that sonicating the bitumen at 200 kHz under air-environment reduces the initial viscosity up to 2079 cP, which was twice larger than that obtained when a low frequency was used. In respect of the gas environment, it was shown that ultrasound irradiation under N2 environment could lower the bitumen viscosity up to 3274 cP. A positive correlation between the asphaltene content and the viscosity reduction was established. The results from the spectral analyses including Fast Fourier Infrared and the observations from Scanned Electron Microscope were consistent with the rheological studies and led to the argument that the viscosity reduction results from either the scission of long chain molecules attached to the aromatic rings (when the applied frequency was altered under fixed gas environment) or the self-aggregation of asphaltene monomers (when gas environment was changed at fixed frequency).Ronald NgueleHirokazu OkawaElsevierarticleAsphalteneBitumen viscosityUltrasoundSonicationBitumenChemistryQD1-999Acoustics. SoundQC221-246ENUltrasonics Sonochemistry, Vol 80, Iss , Pp 105811- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Asphaltene Bitumen viscosity Ultrasound Sonication Bitumen Chemistry QD1-999 Acoustics. Sound QC221-246
spellingShingle	Asphaltene Bitumen viscosity Ultrasound Sonication Bitumen Chemistry QD1-999 Acoustics. Sound QC221-246 Ronald Nguele Hirokazu Okawa Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
description	The present work investigates the contribution of asphaltene aggregation to bitumen viscosity subject to ultrasound irradiation. A West-African bitumen with a viscosity of 12043 cP at room temperature was sonicated at low (38 kHz) and mild frequency (200 kHz) under controlled gas environment including air, nitrogen (N2) and carbon dioxide (CO2). The rheology of the bitumen, asphaltene content analyses as well as spectral studies were conducted. Herein was found that sonicating the bitumen at 200 kHz under air-environment reduces the initial viscosity up to 2079 cP, which was twice larger than that obtained when a low frequency was used. In respect of the gas environment, it was shown that ultrasound irradiation under N2 environment could lower the bitumen viscosity up to 3274 cP. A positive correlation between the asphaltene content and the viscosity reduction was established. The results from the spectral analyses including Fast Fourier Infrared and the observations from Scanned Electron Microscope were consistent with the rheological studies and led to the argument that the viscosity reduction results from either the scission of long chain molecules attached to the aromatic rings (when the applied frequency was altered under fixed gas environment) or the self-aggregation of asphaltene monomers (when gas environment was changed at fixed frequency).
format	article
author	Ronald Nguele Hirokazu Okawa
author_facet	Ronald Nguele Hirokazu Okawa
author_sort	Ronald Nguele
title	Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
title_short	Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
title_full	Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
title_fullStr	Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
title_full_unstemmed	Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
title_sort	effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/9baf0862ab624f38b778097001f7be79
work_keys_str_mv	AT ronaldnguele effectofultrasoundirradiationonasphalteneaggregationandimplicationstorheologicalbehaviorofbitumen AT hirokazuokawa effectofultrasoundirradiationonasphalteneaggregationandimplicationstorheologicalbehaviorofbitumen
_version_	1718400905416540160

Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen

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