We report for the first time the use of click chemistry both to modify the surface morphology and to obtain superhydrophobic properties. Using click chemistry as a postfunctionalization of poly(3,4-ethylenedioxythiophene) nanofibers bearing azido groups, we show that the nanostructures already present on the surface as well as the surface hydrophobicity are highly affected by the used alkyne. These results allow one to envisage widely varied strategies to modify nanostructured surfaces while introducing various functions, for example to produce biosensors or antibacterial surfaces.
Surface modifications are keys for a great number of applications. In order to perfectly control the surface properties, it is important to control the modification pathways. Two general pathways can be described in order to introduce modification on surfaces: the post-strategies and the ante-strategies. In this work, we focus on the comparison between the Huisgen and the Staudinger-Vilarrasa reaction for both post-surface and ante-surface modifications. Here, we focused on the possibility to use both two reactions to obtain superhydrophobic and oleophobic properties. This work includes monomer synthesis, surface modifications with alkyl, aryl or perfluoroalkyl chain.
Postfunctionalization is a key tool for the elaboration of hydrophobic surfaces. For that purpose, the elaboration of surfaces suitable for the Huisgen reaction allows for functionalization with various hydrophobic side chains. Here the synthesis of azido or alkyne monomers is reported to prepare platform surfaces suitable for click chemistry. The surface hydrophobicity and morphology are investigated. Superhydrophobic and parahydrophobic properties are obtained depending on the starting monomer and the molecule used for the postfunctionalization. species are characterized by high θ w but also extremely high H w as observed on rose petals and gecko foot. [11][12][13] These surface properties are called parahydrophobic. [ 14 ] Usually, superhydrophobic properties are obtained by combining high surface roughness (often both of the micro and nanoscale) and low surface energy materials. [ 15,16 ] However, the water adhesion can be controlled by playing with the geometry of the surface structures or by lowering the surface energy. [17][18][19][20] In order to prepare these types of surfaces different approaches can be imagined. [3][4][5][6] It is possible to make physical or optical structuration on hard surfaces, which can be seen as a top down approach. Another option is the possibility of preparing surface starting from low molecular weight materials, which can be described as bottom-up approach. The bottom-up approach can be divided in two different strategies: the ante -and the poststrategies. Modifi cations can be added on the small molecules before the surface elaboration ( ante -strategy) or the modifi cations can be linked on the formed surfaces (poststrategy). Conducting polymers are good candidates for surfaces made with the bottom up approach. The modifi cation can be made on the monomer ( ante ) [ 21 ]
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