Solvent entrainment in and flocculation of asphaltenic aggregates probed by small-angle neutron scattering

Langmuir : the ACS Journal of Surfaces and Colloids
Keith L GawrysPeter K Kilpatrick

Abstract

While small-angle neutron scattering (SANS) has proven to be very useful for deducing the sizes and masses of asphaltenic aggregates in solution, care must be taken to account for solvation effects within the aggregates so as to not err in the characterization of these important systems. SANS measurements were performed on solutions of asphaltenes dispersed in deuterated solvents in which a broad spectrum of solute and solvent chemical compositions was represented. Fits to the scattering intensity curves were performed using the Guinier approximation, the Ornstein-Zernike (or Zimm) model, a mass-fractal model, and a polydisperse cylinder model. The mass-fractal model provided apparent fractal dimensions (2.2-3) for the aggregates that generally decreased with increasing aggregate size, indicating increased surface roughness for larger aggregates. The polydisperse cylinder model provided typical values of the particle thicknesses from 5 to 32 angstroms, the average particle radius from 25 to 125 angstroms, and approximately 30% radius polydispersity. Subsequent calculation of average aggregate molar masses suggested a range of solvent entrainment from 30 to 50% (v/v) within the aggregates that were consistent with previous visco...Continue Reading

References

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Oct 14, 2003·Journal of Colloid and Interface Science·P Matthew SpieckerPeter K Kilpatrick
Jun 2, 2005·Journal of Colloid and Interface Science·Keith L Gawrys, Peter K Kilpatrick
Jun 23, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·P Matthew Spiecker, Peter K Kilpatrick
Nov 18, 2005·Journal of Colloid and Interface Science·Shawn D TaylorJacob Masliyah

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Citations

May 3, 2011·Analytical Chemistry·Ryan P Rodgers, Amy M McKenna
Jun 22, 2011·Annual Review of Analytical Chemistry·Oliver C Mullins
May 11, 2011·The Journal of Physical Chemistry. B·Joëlle EyssautierLoïc Barré
Jan 10, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Kjersta Larson-SmithDanilo C Pozzo
Nov 28, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Michael P Hoepfner, H Scott Fogler
Dec 18, 2009·Journal of Colloid and Interface Science·Kjersta Larson-SmithDanilo C Pozzo
May 30, 2015·Organic & Biomolecular Chemistry·Matthias SchulzeRik R Tykwinski
Feb 18, 2010·Faraday Discussions·Edo S BoekJohan T Padding
Jul 8, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yaoshuang Cheng, Shiling Yuan
Mar 5, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Loïc BarréThierry Palermo
Dec 10, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Thomas F HeadenUlrich M Scheven
Feb 6, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Lukasz ZielinskiYongsheng Liu
Apr 2, 2010·ACS Applied Materials & Interfaces·Salomon Turgman-CohenJan Genzer
Apr 2, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Salomon Turgman-CohenJan Genzer
Feb 24, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Xianhua FengZhenghe Xu
Oct 25, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Vincent J Verruto, Peter K Kilpatrick
Mar 26, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Sara M HashmiAbbas Firoozabadi
Sep 4, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Jhony OrbulescuRoger M Leblanc
Aug 15, 2018·The Journal of Physical Chemistry. B·Mohammad AhmadiJalal Abedi
Dec 3, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Alexandra AlickeJan Vermant

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