Busca avançada
Ano de início
Entree
(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.)

Packing Defects in Fatty Amine Self-Assembled Monolayers on Mica as Revealed from AFM Techniques

Texto completo
Autor(es):
Benitez, Jose J. [1] ; Heredia-Guerrero, Jose A. [2] ; San-Miguel, Miguel A. [3] ; Galloway, Heather C. [4]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, Ctr Mixto, Avda Americo Vespucio 49, Seville 41092 - Spain
[2] Ist Italiano Tecnol, Smart Mat, Via Morego 30, I-16163 Genoa - Italy
[3] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil
[4] Texas State Univ, Honors Coll, 601 Univ Dr, San Marcos, TX 78666 - USA
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Physical Chemistry B; v. 122, n. 2, SI, p. 493-499, JAN 18 2018.
Citações Web of Science: 4
Resumo

Self-assembled monolayers of n-octadecylamine (ODA-SAMs) on mica have been prepared and studied by contact and jumping mode atomic force microscopy (AFM). Adhesion and friction data show that the compactness of the monolayers spontaneously increases as they are allowed to ripen. Molecular packing can also be induced by the controlled mechanical perturbation exerted by the probe when getting into and out of contact intermittently. Under these conditions, defects and vacancies aggregate giving rise to detectable pinholes uniformly distributed in AFM images. Created pinhole density was found to decrease with ripening time, thus confirming the proposed spontaneous self-healing mechanism. Pinhole density is also suggested as a parameter characterizing the packing degree of ODA-SAMs, and it has been related to their tribological properties. Additionally, molecular dynamics simulations were used to corroborate the compatibility between the packing degree and the observed topography of ODA-SAMs on mica. (AU)

Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 15/19709-5 - Estudos teóricos sobre a formação de nanoestruturas de prata metálica mediante irradiação eletrônica em óxidos metálicos ternários
Beneficiário:Miguel Angel San Miguel Barrera
Linha de fomento: Auxílio à Pesquisa - Regular