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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Benitez, Jose J. [1] ; Heredia-Guerrero, Jose A. [2] ; San-Miguel, Miguel A. [3] ; Galloway, Heather C. [4]
Total Authors: 4
[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
Total Affiliations: 4
Document type: Journal article
Source: Journal of Physical Chemistry B; v. 122, n. 2, SI, p. 493-499, JAN 18 2018.
Web of Science Citations: 4

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)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 15/19709-5 - Theoretical studies on the formation of metallic silver nanostructures by electronic irradiation in ternary metal oxides
Grantee:Miguel Angel San Miguel Barrera
Support type: Regular Research Grants