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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.)

Monolayer Collapse Regulating Process of Adsorption-Desorption of Palladium Nanoparticles at Fatty Acid Monolayers at the Air-Water Interface

Full text
Author(s):
Goto, Thiago E. [1] ; Lopez, Ricardo F. [1] ; Iost, Rodrigo M. [2] ; Crespilho, Frank N. [2] ; Caseli, Luciano [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, BR-09972270 Sao Paulo - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Langmuir; v. 27, n. 6, p. 2667-2675, MAR 15 2011.
Web of Science Citations: 4
Abstract

In this paper, we investigate the affinity of palladium nanoparticles, stabilized with glucose oxidase, for fatty acid monolayers at the air-water interface, exploiting the interaction between a planar system and spheroids coming from the aqueous subphase. A decrease of the monolayer collapse pressure in the second cycle of interface compression proved that the presence of the nanoparticles causes destabilization of the monolayer in a mechanism driven by the interpenetration of the enzyme into the bilayer/multilayer structure formed during collapse, which is not immediately reversible after monolayer expansion. Surface pressure and surface potential-area isotherms, as well as infrared spectroscopy {[}polarization modulation infrared reflection adsorption spectroscopy (PM-IRRAS)] and deposition onto solid plates as Langmuir-Blodgett (LB) films, were employed to construct a model in which the nanoparticle has a high affinity for the hydrophobic core of the structure formed after collapse, which provides a slow desorption rate from the interface after rnonolayer decompression. This may have important consequences on the interaction between the metallic particles and fatty acid monolayers, which implies the regulation of the multifunctional properties of the hybrid material. (AU)

FAPESP's process: 08/10851-0 - Ultrathin films to fabrication of biosensors and biomembrane mimicking: applications in environmental and health areas
Grantee:Luciano Caseli
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 10/07248-0 - Interaction of sulfated polysaccharides with thin films organized at the air-water interface
Grantee:Ricardo de Felice Lopez
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 09/15558-1 - Biomolecules and cellular system interaction with nanostructures 0D, 1D and 2D by using electrochemical methods
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants