Busca avançada
Ano de início
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Modulation of Turing Patterns in the CDIMA Reaction by Ultraviolet and Visible Light

Texto completo
Nagao, Raphael [1, 2] ; de Miranda, Renan C. C. [1] ; Epstein, Irving R. [3, 4] ; Dolnik, Milos [3, 4]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Ctr Innovat New Energies, BR-13083841 Campinas, SP - Brazil
[3] Brandeis Univ, Dept Chem, Waltham, MA 02454 - USA
[4] Brandeis Univ, Volen Ctr Complex Syst, Waltham, MA 02454 - USA
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Physical Chemistry A; v. 123, n. 5, p. 992-998, FEB 7 2019.
Citações Web of Science: 0

We have carried out the first systematic study of the effects of ultraviolet light, both alone and in combination with visible white light, on Turing patterns in the chlorine dioxide-iodine-malonic acid (CDIMA) reaction. The ultraviolet light used has a sharp peak at 368 nm and can perturb the system selectively. It primarily decomposes chlorine dioxide in a zeroth-order reaction, and when it is used to illuminate Turing patterns, shrunken spots are formed with an imperfect hexagonal arrangement. The ultraviolet light competes directly with the visible white light via the photoreaction with dissolved chlorine dioxide, which prevents the total suppression of patterns at intermediate intensities of white light. These results suggest that specific wavelengths of light in the ultraviolet spectrum selectively modify the chemistry behind the pattern formation and can be utilized to generate novel self-organized structures under forcing conditions. We propose a modified Lengyel-Epstein model to incorporate the effect of ultraviolet illumination and obtain good qualitative agreement between simulations and experiments. These results support the idea that chlorine dioxide photoreaction is a key step in modulating CDIMA patterns under ultraviolet illumination. (AU)

Processo FAPESP: 16/22262-5 - Desenho e controle de padrões eletroquímicos auto-organizados
Beneficiário:Raphael Nagao de Sousa
Linha de fomento: Bolsas no Brasil - Apoio a Jovens Pesquisadores
Processo FAPESP: 16/01817-9 - Desenho e controle de padrões eletroquímicos auto-organizados
Beneficiário:Raphael Nagao de Sousa
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores