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

Ronald Nguele, Hirokazu Okawa

研究成果: ジャーナルへの寄稿学術誌査読

11 被引用数 (Scopus)

抄録

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).

本文言語英語
論文番号105811
ジャーナルUltrasonics Sonochemistry
80
DOI
出版ステータス出版済み - 12月 2021

!!!All Science Journal Classification (ASJC) codes

  • 化学工学(その他)
  • 放射線学、核医学およびイメージング
  • 無機化学
  • 音響学および超音波学
  • 環境化学
  • 有機化学

フィンガープリント

「Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル