| Texto completo | |
| Autor(es): |
Dourado, Andre H. B.
[1]
;
Silva, Rubens A.
[1]
;
Torresi, Roberto M.
[1]
;
Sumodjo, Paulo T. A.
[1]
;
Arenz, Matthias
[2, 3]
;
Cordoba de Torresi, Susana I.
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes, BR-05508080 Sao Paulo, SP - Brazil
[2] Kobenhavn Univ, Chem Dept, Univ Pk 5, DK-2100 Copenhagen - Denmark
[3] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern - Switzerland
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ChemPhysChem; v. 19, n. 18, p. 2340-2348, SEP 18 2018. |
| Citações Web of Science: | 3 |
| Resumo | |
A quartz crystal microbalance method with dissipation (QCM-D) and attenuated total reflection Fourier-transform infrared (ATR-FTIRS) spectroscopy were used to study the adsorption of L-cysteine (L-Cys) on Pt. Through QCM-D, it was possible to verify that the viscoelastic properties of the adsorbed species play an important role in the adsorption, rendering Sauerbrey's equation inapplicable. The modelling of QCM-D data exposed two different processes for the adsorption reaction. The first one had an activation time and is fast, whereas the second is slow. These processes were also resolved by ATR-FTIRS and identified to be water and anion adsorption preceded by L-Cys adsorption. Both techniques reveal that the degree of surface coverage is pH dependent. Spectroscopic data indicate that the conformation of L-Cys((ads)) changes with pH and that the structures do not fully agree with those proposed in literature for other metallic surfaces. The assembling of the adsorbed monolayer appeared to be very fast, and it was not possible to determine or quantify this kinetics. The conformation is also controlled by applied potential, and the anion adsorption and interfacial water depends on the conformation of the adsorbed molecules. (AU) | |
| Processo FAPESP: | 17/08349-3 - Estudo do processo de adesão e proliferação celular em filmes finos de PEDOT-co-PDLLA suportado em eletrodo de Au funcionalizado com laminina, integrina e fibronectina |
| Beneficiário: | Rubens Araujo da Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/25592-8 - Estudo da adsorção de L-cisteína e L-cistina sobre eletrodo de platina |
| Beneficiário: | André Henrique Baraldi Dourado |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 15/08300-9 - Estudo da adsorção e oxidação de L-cisteína e L-cistina sobre eletrodo de Pt por espectroscopia infravermelho de reflexão interna e DEMS |
| Beneficiário: | André Henrique Baraldi Dourado |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto |