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Figure 1. (A) Schematic illustration of the experimental procedure to fabricate wrinkled surfaces. A confined photosensitive mixture is irradiated and heated at the same time. During this process volume contraction and capillary forces act simultaneously, inducing the formation of wrinkled interfaces
This and the next image are from:
Marta Palacios-Cuesta (1), Aitziber L. Cortajarena (2), Olga Garcia (1) and Juan Rodriquez-Hernandez (1)
(1) Department of Chemistry and Properties of Polymers, Instituto de Ciencia y Tecnología de Polímeros-Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
(2) Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049 Madrid, Spain
“Fabrication of functional wrinkled interfaces from polymer blends: Role of the surface functionality on the bacterial adhesion”, Polymers, Vol. 6, pp 2845-2861, 2014, doi:10.3390/polym6112845
ABSTRACT: The generation of nano-microstructured surfaces is a current challenge in polymer science. The fabrication of such surfaces has been accomplished mainly following two different alternatives i.e., by adapting techniques, such as molding (embossing) or nano/microimprinting, or by developing novel techniques including laser ablation, soft lithography or laser scanning. Surface instabilities have been recently highlighted as a promising alternative to induce surface features. In particular, wrinkles have been extensively explored for this purpose. Herein, we describe the preparation of wrinkled interfaces by confining a photosensitive monomeric mixture composed of monofunctional monomer and a crosslinking agent within a substrate and a cover. The wrinkle characteristics can be controlled by the monomer mixture and the experimental conditions employed for the photopolymerization. More interestingly, incorporation within the material of a functional copolymer allowed us to vary the surface chemical composition while maintaining the surface structure. For that purpose we incorporated either a fluorinated copolymer that enhanced the surface hydrophobicity of the wrinkled interface or an acrylic acid containing copolymer that increased the hydrophilicity of the wrinkled surface. Finally, the role of the hydrophobicity on the bacterial surface adhesion will be tested by using Staphylococcus aureus.
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