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Dislocations in plastically deformed L12 compounds based on Al3Ti

Morris, D.G.

In: Journal of Materials Research, 1992, vol. 7, no. 2, p. 303-312

Université de Fribourg

Dynamic and biocompatible thermo-responsive magnetic hydrogels that respond to an alternating magnetic field

Crippa, Federica ; Moore, Thomas L. ; Mortato, Mariangela ; Geers, Christoph ; Haeni, Laetitia ; Hirt, Ann M. ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Journal of Magnetism and Magnetic Materials, 2017, vol. 427, p. 212–219

Magnetic thermo-responsive hydrogels are a new class of materials that have recently attracted interest in biomedicine due to their ability to change phase upon magnetic stimulation. They have been used for drug release, magnetic hyperthermia treatment, and can potentially be engineered as stimuli-responsive substrates for cell mechanobiology. In this regard, we propose a series of magnetic...

Université de Fribourg

Controlling hierarchical self-assembly in supramolecular tailed-dendron systems

Merlet-Lacroix, Nathalie ; Rao, Jingyi ; Zhang, Afang ; Schlüter, A. Dieter ; Bolisetty, Sreenath ; Ruokolainen, Janne ; Mezzenga, Raffaele

In: Macromolecules, 2010, vol. 43, no. 10, p. 4752–4760

We study the self-assembly of a dendritic macromolecular system formed by a second-generation dendron with pH-responsive end groups and with a polymer chain emanating from its focal point, typically referred to as dendron-coil system. We use supramolecular ionic interactions to attach to the periphery of the dendrons sulfate-terminated alkyl tails of various lengths. The resulting ionic complexes...

Université de Fribourg

Elastic torsion effects in magnetic nanoparticle diblock-copolymer structures

Schulz, Leander ; Schirmacher, W. ; Omran, A. ; Shah, V. R. ; Böni, P. ; Petry, W. ; Müller-Buschbaum, P.

In: Journal of Physics: Condensed Matter, 2010, vol. 22, no. 34, p. 346008

Magnetic properties of thin composite films, consisting of non-interacting polystyrene-coated γ-Fe₂O₃ (maghemite) nanoparticles embedded into polystyrene-block-polyisoprene P(S-b-I) diblock-copolymer films are investigated. Different particle concentrations, ranging from 0.7 to 43 wt%, have been used. The magnetization measured as a function of external field and temperature...

Université de Fribourg

Crystallization-induced aggregation of block copolymer micelles: influence of crystallization kinetics on morphology

Mihut, Adriana M. ; Crassous, Jérôme J. ; Schmalz, Holger ; Ballauff, Matthias

In: Colloid & Polymer Science, 2010, vol. 288, no. 5, p. 573-578

We present a systematic investigation of the crystallization and aggregation behavior of a poly(1,2-butadiene)-block-poly(ethylene oxide) diblock copolymer (PB-b-PEO) in n-heptane. n-Heptane is a poor solvent for PEO and at 70°C the block copolymer self-assembles into spherical micelles composed of a liquid PEO core and a soluble PB corona. Time- and...

Université de Fribourg

Direct imaging of nanoscopic plastic deformation below bulk Tg and chain stretching in temperature-responsive block copolymer hydrogels by Cryo-TEM

Nykänen, Antti ; Nuopponen, Markus ; Hiekkataipale, Panu ; Hirvonen, Sami-Pekka ; Soininen, Antti ; Tenhu, Heikki ; Ikkala, Olli ; Mezzenga, Raffaele

In: Macromolecules, 2008, vol. 41, no. 9, p. 3243–3249

This work describes the thermoresponsive transition in polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrene (PS-block-PNIPAM-block-PS) triblock copolymer hydrogels, as observed by both direct and reciprocal space in-situ characterization. The hydrogel morphology was studied in both the dry and wet state, at temperatures below and beyond the coil−globule transition of PNIPAM, using...