Université de Fribourg

Interfacial activity and interfacial shear rheology of native ß-lactoglobulin monomers and their heat-induced fibers

Jung, Jin-Mi ; Zeynel Gunes, Deniz ; Mezzenga, Raffaele

In: Langmuir, 2010, vol. 26, no. 19, p. 15366–15375

Interfacial properties of native β-lactoglobulin monomers and their heat-induced fibers, of two different lengths, were investigated at pH 2, through surface tension measurements at water−air and water−oil interfaces and interfacial shear rheology at the water−oil interface. The applied heat treatment generates a mixed system of fibers with unconverted monomers and hydrolyzed peptides. The...

Université de Fribourg

Structure, diffusion, and permeability of protein-stabilized monodispersed oil in water emulsions and their gels: a self-diffusion NMR study

Romoscanu, Alexandre I. ; Fenollosa, Annia ; Acquistapace, Simone ; Gunes, Deniz ; Martins-Deuchande, Teresa ; Clausen, Pascal ; Mezzenga, Raffaele ; Nydén, Magnus ; Zick, Klaus ; Hughes, Eric

In: Langmuir, 2010, vol. 26, no. 9, p. 6184–6192

Self-diffusion NMR is used to investigate monodispersed oil in water emulsions and the subsequent gel formed by removing the water through evaporation. The radius of the oil droplets in the emulsions is measured using a number of diffusion methods based on the measurement of the mean squared displacement of the oil, water, and tracer molecules. The results are consistent with the known size of...

Université de Fribourg

pH Influence on the stability of foams with protein–polysaccharide complexes at their interfaces

Miquelim, Joice N. ; Lannes, Suzana C.S. ; Mezzenga, Raffaele

In: Food Hydrocolloids, 2010, vol. 24, no. 4, p. 398-405

Food foams such as marshmallow, Chantilly and mousses have behavior and stability directly connected with their microstructure, bubble size distribution and interfacial properties. A high interfacial tension inherent to air/liquid foams interfaces affects its stability, and thus it has a direct impact on processing, storage and product handling. In this work, the interactions of egg albumin with...

Université de Fribourg

Poly(3-hexylthiophene)-b-poly(3-cyclohexylthiophene): synthesis, microphase separation, thin film transistors, and photovoltaic applications

Wu, Pei-Tzu ; Ren, Guoqiang ; Kim, Felix S. ; Li, Chaoxu ; Mezzenga, Raffaele ; Jenekhe, Samson A.

In: Journal of Polymer Science Part A: Polymer Chemistry, 2010, vol. 48, no. 3, p. 614-626

We report the synthesis, characterization, microphase separation, field-effect charge transport, and photovoltaic properties of regioregular poly(3-hexylthiophene)-b-poly(3-cyclohexylthiophene) (P3HT-b-P3cHT). Two compositions of P3HT-b-P3cHT (HcH63 and HcH77) were synthesized with weight-average molecular weights of 155,500 and 210,800 and polydispersity indices of 1.45 and...

Université de Fribourg

A new supramolecular route for using rod-coil block copolymers in photovoltaic applications

Sary, Nicolas ; Richard, Fanny ; Brochon, Cyril ; Leclerc, Nicolas ; Lévêque, Patrick ; Audinot, Jean-Nicolas ; Berson, Solenn ; Heiser, Thomas ; Hadziioannou, Georges ; Mezzenga, Raffaele

In: Advanced Materials, 2010, vol. 22, no. 6, p. 763-768

A new polymer blend formed by poly(3-hexylthiophene)-poly(4-vinylpyridine) (P3HT- P4VP) block copolymers and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is reported. The P4VP and PCBM are mixed together by weak supramolecular interactions, and the resulting materials exhibit microphase separated morphologies of electron-donor and electron-acceptor rich domains. The properties of the blend,...

Université de Fribourg

Liquid crystalline period variations in self-assembled block copolypeptides-surfactant ionic complexes

Li, Chaoxu ; Li, Jingguo ; Zhang, Xiuqiang ; Zhang, Afang ; Mezzenga, Raffaele

In: Macromolecular Rapid Communications, 2010, vol. 31, no. 3, p. 265-269

We investigate the complexation of ampholytic poly(N-isopropylacylamide)-block-poly- (L-glutamic acid)-block-poly(L-lysine) (PNiPAM-b-PLG-b-PLLys) triblock copolymers and PNiPAM-block-(PLG-co-PLLys) diblock copolymers with counter charged anionic and cationic surfactants. Both triblock and diblock copolymers are able to selectively form complexes...

Université de Fribourg

Synthesis and self-assembly behavior of poly(fluorenylstyrene)-block-poly(2-vinylpyridine) block copolymers and their blends with single wall carbon nanotubes (SWCNTs)

Li, Chaoxu ; Hsu, Jung-Ching ; Sugiyama, Kenji ; Hirao, Akira ; Chen, Wen-Chang ; Mezzenga, Raffaele

In: Macromolecules, 2009, vol. 42, no. 15, p. 5793–5801

We have synthesized a series of poly[4-(9,9-dihexylfluoren-2-yl)styrene]-block-poly(2-vinylpyridine) (P(St-F1)-b-P2VP) and poly[4-di(9,9-dihexylfluoren-2-yl)styrene]-block-poly(2-vinylpyridine) (P(St-F1₂)-b-P2VP) comblike block copolymers and investigated their self-assembly behavior. The block composition, molecular weight, and the length of the fluorene side chain...

Université de Fribourg

a new level of hierarchical structure control by use of supramolecular self-assembled dendronized block copolymers

Li, Chaoxu ; Schlüter, Dieter A. ; Zhang, Afang ; Mezzenga, Raffaele

In: Advanced Materials, 2008, vol. 20, no. 23, p. 4530 - 4534

Complexation of dendronized block copolymers with sulfate alkyl tails forms unprecedented hierarchically ordered bulk structures, including rectangular-in-lamellar, tetragonal-in-lamellar, hexagonal-in-lamellar and lamellar-in-lamellar. These novel liquid-crystalline morphologies, which can be designed at low length scales in these systems, are expected to provide final materials with not only...