Clara Pereira - Designing novel hybrid materials by one-pot co-condensation: from hydrophobic mesoporous silica nanoparticles to super-amphiphobic cotton textiles

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      “Designing   novel hybrid materials by one-pot co-condensation: from   hydrophobic mesoporous silica nanoparticles to super-amphiphobic   cotton textiles”,   C. Pereira, C.   Alves, A. Monteiro, C. Magén, A. M. Pereira, A. Ibarra, M. R.   Ibarra, P. B. Tavares, J. P. Araújo, G. Blanco, J. M. Pintado, A.   P. Carvalho, J. Pires, M. F. R. Pereira, C. Freire, ACS   Applied Materials & Interfaces 2011,   3, 2289–2299. doi: 10.1021/am200220x


      This work reports the synthesis and characterization of   mesoporous silica nanoparticles (MSNs) functionalized with   tridecafluorooctyltriethoxysilane (F13) and their in situ   incorporation onto cotton textiles. The hybrid MSNs and the   functional textiles were prepared by a one-pot co-condensation   methodology between tetraethylorthosilicate (TEOS) and F13, with   hexadecyltrimethylammonium chloride (CTAC) as the template and   triethanolamine as the base. The influence of the F13 to TEOS   molar ratio (1:10, 1:5 and 1:3) on the nanoparticle morphology,   porosity, degree of functionalization, and hydro/oleophobic   properties is discussed. The hybrid nanosilicas presented high   colloidal stability and were spherical and monodispersed with   average particle size of 45   nm. They also showed high surface areas, large pore volumes, and   a wormhole-type mesoporous structure. The increase in the   organosilane proportion during the co-condensation process led to   a more radially branched wormhole-like mesoporosity, a decrease   in the surface area, pore volume, and amount of surface silanol   groups, and an enrichment of the surface with fluorocarbon   moieties. These changes imparted hydrophobic and oleophobic   properties to the materials, especially to that containing the   highest F13 loading. Cotton textiles were coated with the   F13-MSNs through an efficient and less time-consuming route. The   combination between surface roughness and mesoporosity imparted   by the MSNs, and the low surface energy provided by the   organosilane resulted in superhydrophobic functional textiles.   Moreover, the textile with the highest loading of fluorocarbon   groups was superamphiphobic.

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