Title of article :
Study of Brazilian asphaltene aggregation by Nuclear Magnetic Resonance spectroscopy
Author/Authors :
da Silva Oliveira، نويسنده , , Emanuele Catarina and Neto، نويسنده , , ءlvaro Cunha and Jْnior، نويسنده , , Valdemar Lacerda and de Castro، نويسنده , , Eustلquio Vinيcius Ribeiro and de Menezes، نويسنده , , Sônia Maria Cabral، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Abstract :
Nuclear Magnetic Resonance experiments were used to study the relationship between the structural type (continental or archipelago) and aggregation properties of three different asphaltenes (asph_A, asph_B and asph_C). Diffusion-ordered NMR spectroscopy (DOSY) was applied to investigate the diffusion coefficients. The self-diffusion of the asphaltene aggregates was investigated in the concentration range of 0.01–10% of each asphaltene in deuterated toluene. Data obtained from 1H and 13C NMR indicate that asph_B has a predominantly continental type of structure. This contributes to different properties of aggregation. DOSY shows the presence of three aggregates, with three different diffusion coefficients, called nanoaggregate, microaggregate and macroaggregate.
Keywords :
1H NMR and DOSY , Asphaltene aggregation
