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The asphaltenes contain a lot of hetero-atoms, such as sulfur, nitrogen and oxygen, which play an important role on the polarity and association characteristics of asphaltenes. The n-heptane asphaltene was derived from the Tahe atmospheric residue (THAR). In addition, THAR n-heptane asphaltene was divided into three sub-fractions by difference of the polarities. The mean dipole moments of asphaltene...
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