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Comportamento interfacciale degli asfalteni nei sistemi olio/acqua
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ISBN10: 6207835220
ISBN13: 9786207835225
Publisher: Edizioni Sapienza
Published: May 27 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786207835225
Publisher: Edizioni Sapienza
Published: May 27 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: Italian
Nel presente lavoro, la tecnica della tensiometria a goccia sospesa è stata utilizzata per descrivere meglio le proprietà reologiche interfacciali degli asfalteni, estratti da due oli brasiliani, alle interfacce toluene/acqua ed eptolo (eptano+toluene)/acqua, variando le proporzioni dei solventi organici in 1:1 e 1,5:1 e la concentrazione degli asfalteni. Sono state studiate le isoterme di adsorbimento e le equazioni di stato di Gibbs e Langmuir. Per i sistemi contenenti toluene come solvente, l'attrazione tra le molecole del solvente e le molecole di asfaltene è forte a causa della sua elevata solubilità , riducendo così l'attività interfacciale delle molecole di asfaltene. Nei sistemi contenenti eptolo come solvente, l'interazione tra le molecole di asfaltene e le molecole di solvente è debole, con conseguente aumento dell'attività interfacciale delle molecole di asfaltene. Le proprietà reologiche interfacciali dilatative dei sistemi studiati (IFT, pressione superficiale e modulo di elasticità ) dipendono esclusivamente dalla copertura interfacciale. Questi risultati sono utili per comprendere come avvengono i processi di adsorbimento dell'asfaltene nelle interfacce fluido/fluido a livello microscopico.
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