In: Molecular Crystals and Liquid Crystals, 2010, vol. 525, p. 104 - 111
We explored how to increase liquid crystal sensitivity to external magnetic fields. Suspensions consisting of a mixture of liquid crystal and spindle type mono-dispersed hematite nano-particles at concentrations lower than 1 wt% were prepared. The Freacuteedericksz transition threshold for the suspensions appeared to be lower than for the pure liquid crystal. It was proved that adding canted...
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In: Soft Matter, 2010, vol. 6, p. 2174-2177
We describe the synthesis of thermoresponsive, magnetic, optically anisotropic and orientable colloidal particles based on poly(N-isopropylacrylamide) hybrid microgels (PNIPAMs) with an embedded ellipsoidal hematite (α-Fe₂O₃) core. Our ability to orient the particles with a magnetic field is demonstrated by small angle X-ray scattering and by optical polarization microscopy.
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In: Surface and Coatings Technology, 2010, vol. 204, no. 11, p. 1749-1754
Titanium is an interesting material for biomedical implants thanks to its physical and chemical properties. In particular, TiO₂ coatings with a surface characterized by micro-patterning combined with nano-topography are extremely attractive for orthopaedic implants in terms of enhanced osteointegration and consequently improved implant fixation. In the present work, a new method for the...
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In: Bioconjugate Chemistry, 2009, vol. 20, no. 7, p. 1349–1355
We report a versatile approach for the immobilization of unmodified monosaccharides onto iron oxide nanoparticles. Covalent coupling of the carbohydrate onto iron oxide nanoparticle surfaces was accomplished by the CH insertion reaction of photochemically activated phosphate-functionalized perfluorophenylazides (PFPAs), and the resulting glyconanoparticles were characterized by IR, TGA, and TEM....
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In: Langmuir, 2009, vol. 25, no. 4, p. 1940–1948
Amphiphilic diblock copolymers such as poly(styrene)-block-poly(styrene sulfonate) (PS-b-PSS) (Matsuoka, H.; Maeda, S.; Kaewsaiha, P.; Matsumoto, K. Langmuir 2004, 20, 7412), belong to a class of new polymeric surfactants that ionize strongly in aqueous media. We investigated their self-assembly behavior in aqueous solutions and used them as an emulsifier to...
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In: Macromolecules, 2009, vol. 41, no. 21, p. 8130–8137
We report on the dependence of proton conductivity on the morphologies of sulfonated polystyrene−poly(methyl methacrylate) (sPS−PMMA) diblock copolymers. Three different diblock copolymers of varying molecular weight and block volume fraction were studied, and for each one several sulfonation degrees of the PS block were considered. The investigation of the morphologies of the...
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In: Journal of Colloid and Interface Science, 2008, vol. 318, no. 2, p. 264-270
Functionalization of colloidal particles based on the use of polyelectrolytes and heterocoagulation was combined with electrophoretic deposition (EPD), with the aim of depositing titania–polystyrene (TiO₂–PS) composite particles on Ti6Al4V substrates. The composite particles were obtained by heterocoagulation of TiO₂ nanoparticles on the surface of monosized polystyrene beads of 4.6 μm...
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Thèse de doctorat : Université de Fribourg, 2006 ; Nr. 1537.
Spherical and monodisperse SiO2 silica colloidal particles in a range of 30 nm to 1 μm are prepared using sol-gel processes. Their surfaces are functionalized with silane agent allowing covalent bond formation or not with macromolecules chains of a crosslinked elastomer (PMMA or PAA), polymerized under UV light. In order to track particle under shear, there is a need to produce fluorescent...
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In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2006, vol. 291, no. 1-3, p. 110-116
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