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Surface crystallization of ionic liquid crystals

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Autor(es):
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Martins, Monia A. R. [1, 2, 3] ; Carvalho, Pedro J. [1] ; Alves, Douglas [4] ; Dariva, Claudio [4] ; Costa, Mariana C. [5] ; Ferreira, Rute A. S. [6] ; Andre, Paulo S. [7] ; Morgado, Pedro [8] ; Pinho, Simao P. [2, 3] ; Filipe, Eduardo J. M. [8] ; Coutinho, Joao A. P. [1]
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] Univ Aveiro, Dept Chem, CICECO, Aveiro - Portugal
[2] Polytech Inst Braganca, Associate Lab LSRE, LCM, Braganca - Portugal
[3] Polytech Inst Braganca, Mt Res Ctr, CIMO, Braganca - Portugal
[4] UNIT, Inst Res & Technol, Rio De Janeiro - Brazil
[5] Univ Estadual Campinas, Sch Chem Engn, Campinas, SP - Brazil
[6] Univ Aveiro, Dept Phys, CICECO, Aveiro - Portugal
[7] Univ Lisbon, IST, IT & DECE, Lisbon - Portugal
[8] Univ Lisbon, IST, Ctr Quim Estrut, Lisbon - Portugal
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: Physical Chemistry Chemical Physics; v. 21, n. 32, p. 17792-17800, AUG 28 2019.
Citações Web of Science: 0
Resumo

The evidence for surface crystallization in ionic liquids is scarce. The existing reports seem to be contradictory as for its driving forces, since in the two compounds investigated in the literature, the contribution of coloumbic and van der Waals forces is very different. In this work 1-dodecyl-3-methylimidazolium tetrafluoroborate was studied and its surface crystallization characterized by surface tension, ellipsometry and optical microscopy. The results obtained seem to reconcile previous observations, and it was further shown, using the same techniques, that this phenomenon is prevalent in other ionic liquids. MD simulation results illustrate the different possibilities of organization, providing reasonable models to rationalize the experimental observations. (AU)

Processo FAPESP: 12/05027-1 - Equilíbrio sólido-líquido de compostos graxos e ponto de fulgor de biodiesel
Beneficiário:Mariana Conceição da Costa
Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Apoio a Jovens Pesquisadores