| Texto completo | |
| Autor(es): |
Telles da Cruz, Adriana Falconi
[1]
;
Sanches, Ramon Domingues
[1]
;
Miranda, Caetano Rodrigues
[2]
;
Brochsztain, Sergio
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, BR-09210580 Santo Andre - Brazil
[2] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | COLLOIDS AND INTERFACES; v. 2, n. 1 MAR 2018. |
| Citações Web of Science: | 1 |
| Resumo | |
In the present work, the use of Cyclodextrins (CDs) as wettability modifiers for enhanced oil recovery (EOR) was evaluated. Cyclodextrins (CDs) are cyclic oligosaccharides that form inclusion complexes with various organic molecules, including n-alkanes. Wettability was evaluated through the contact angle (theta) of an n-dodecane drop in contact with a quartz surface and immersed in a 0.6 M NaCl aqueous solution containing the CDs. The quartz surface was functionalized with octadecyltrichlorosilane (OTS), rendering the surface oil-wet (C-18-quartz). Here, the n-dodecane, the saline solution and the C-18-quartz represent the oil, the reservoir brine and an oil-wet rock surface, respectively. In the absence of CDs, the n-dodecane drops spread well over the C-18-quartz, showing that the surface was oleophilic. In the presence of CDs, remarkable effects on the wettability were observed. The most dramatic effects were observed with alpha-cyclodextrin (alpha-CD), in which case the C-18-quartz surface changed from oil-wet (theta = 162 degrees) in the absence of CD to water-wet (theta = 33 degrees) in the presence of 1.5% (w/v) alpha-CD. The effects of the CDs can be explained by the formation of surface-active inclusion complexes between the CDs and n-dodecane molecules. The CD inclusion complexes can be regarded as pseudo-surfactants, which are less harmful to the environment than the traditional surfactants employed by the petroleum industry. (AU) | |
| Processo FAPESP: | 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte |
| Beneficiário: | Adalberto Fazzio |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 16/05496-2 - Síntese e caracterização de organosílicas mesoporosas contendo imidas aromáticas e suas aplicações na área de energia |
| Beneficiário: | Sergio Brochsztain |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |