The use of colloidal ferrofluid as building blocks for nanostructured layer-by-layer films fabrication |
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Authors: | A Pereira S Alves M Casanova V Zucolotto I H Bechtold |
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Institution: | 1. Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil 2. Departamento de Ciências Exatas e da Terra de Física, Universidade Federal de S?o Paulo, Diadema, SP, 09972-270, Brazil 3. Instituto de Física de S?o Carlos, Universidade de S?o Paulo, P.O. Box 369, S?o Carlos, SP, 13560-970, Brazil
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Abstract: | The electrostatic layer-by-layer technique has been exploited as an useful strategy for fabrication of nanostructured thin films, in which specific properties can be controlled at the molecular level. Ferrofluids consist of a colloidal suspension of magnetic grains (with only a few nanometers of diameter) with present interesting physical properties and applications, ranging from telecommunication to drug delivery systems. In this article, we developed a new strategy to manipulate ferrofluids upon their immobilization in nanostructured layered films in conjunction with conventional polyelectrolytes using the layer-by-layer technique. We investigated the morphological, optical, and magnetic properties of the immobilized ferrofluid as a function of number of bilayers presented in the films. Ferrofluid/polyelectrolyte multilayers homogeneously covered the substrates surface, and the magnetic and optical properties of films exhibited a linear dependence on the number of bilayers adsorbed. |
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