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Université de Fribourg

Mono-telechelic polymers by catalytic living ring-opening metathesis polymerization with second-generation Hoveyda–Grubbs catalyst

Liu, Peng ; Dong, Zhenghao ; Kilbinger, Andreas F. M.

In: Materials Chemistry Frontiers, 2020, vol. 4, no. 9, p. 2791–2796

The second-generation Hoveyda–Grubbs (HG2) catalyst, which has a small initiation to propagation rate ratio (ki/kp) in ring-opening metathesis polymerization (ROMP), was successfully used in a recently developed catalytic living ROMP. This proved that slow-initiating catalysts can enable ROMP in a living fashion to produce polymers with narrow dispersity and controlled molecular weight. The...

Université de Fribourg

Carbon‐assisted stable silver nanostructures

Abdollahi, S. Narjes ; Ochoa Martínez, Efraín ; Kilchoer, Cédric ; Kremer, Geoffroy ; Jaouen, Thomas ; Aebi, Philipp ; Hellmann, Tim ; Mayer, Thomas ; Gu, Yibei ; Wiesner, Ulrich B. ; Steiner, Ullrich ; Wilts, Bodo D. ; Gunkel, Ilja

In: Advanced Materials Interfaces, 2020, vol. 7, no. 23, p. 2001227

Nanostructured silver stands out among other plasmonic materials because its optical losses are the lowest of all metals. However, nanostructured silver rapidly degrades under ambient conditions, preventing its direct use in most plasmonic applications. Here, a facile and robust method for the preparation of highly stable nanostructured silver morphologies is introduced. 3D nanostructured...

Université de Fribourg

Shear stress-responsive polymersome nanoreactors inspired by the marine bioluminescence of dinoflagellates

Rifaie‐Graham, Omar ; Galensowske, Nikolas F. B. ; Dean, Charlie ; Pollard, Jonas ; Balog, Sandor ; Gouveia, Micael G. ; Chami, Mohamed ; Vian, Antoine ; Amstad, Esther ; Lattuada, Marco ; Bruns, Nico

In: Angewandte Chemie International Edition, 2020, p. -

Some marine plankton called dinoflagellates emit light in response to the movement of surrounding water, resulting in a phenomenon called milky seas or sea sparkle. The underlying concept, a shear-stress induced permeabilisation of biocatalytic reaction compartments, is transferred to polymer-based nanoreactors. Amphiphilic block copolymers that carry nucleobases in their hydrophobic block...

Université de Fribourg

When plants and plastic interact

Schwab, Fabienne ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Nature Nanotechnology, 2020, vol. 15, no. 9, p. 729–730

Overcoming the challenges of plastic detection in plants has made it possible to transfer many of the lessons learned from plant–metal nanoparticle interactions to plastic nanoparticles.

Université de Fribourg

Rapid and sensitive quantification of cell-associated multi-walled carbon nanotubes

Steinmetz, Lukas ; Bourquin, Joel ; Barosova, Hana ; Haeni, Laetitia ; Caldwell, Jessica ; Milosevic, Ana ; Geers, Christoph ; Bonmarin, Mathias ; Taladriz-Blanco, Patricia ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Nanoscale, 2020, vol. 12, no. 33, p. 17362–17372

Evaluating nanomaterial uptake and association by cells is relevant for in vitro studies related to safe-by-design approaches, nanomedicine or applications in photothermal therapy. However, standard analytical techniques are time-consuming, involve complex sample preparation or include labelling of the investigated sample system with e.g. fluorescent dyes. Here, we explore lock-in...

Université de Fribourg

Particle surfaces to study macrophage adherence, migration, and clearance

Septiadi, Dedy ; Lee, Aaron ; Spuch‐Calvar, Miguel ; Moore, Thomas Lee ; Spiaggia, Giovanni ; Abdussalam, Wildan ; Rodriguez‐Lorenzo, Laura ; Taladriz‐Blanco, Patricia ; Rothen‐Rutishauser, Barbara ; Petri‐Fink, Alke

In: Advanced Functional Materials, 2020, p. 2002630

Nanoparticle adsorption to substrates pose a unique challenge to understand uptake mechanisms as it involves the organization of complex cytoskeletal components by cells to perform endocytosis/phagocytosis. In particular, it is not well‐understood from a cell mechanics perspective how the adhesion of particles on substrate will influence the ease of material clearance. By using a particle...

Université de Fribourg

A novel 3D intestine barrier model to study the immune response upon exposure to microplastics

Lehner, Roman ; Wohlleben, Wendel ; Septiadi, Dedy ; Landsiedel, Robert ; Petri‑Fink, Alke ; Rothen‑Rutishauser, Barbara

In: Archives of Toxicology, 2020, p. -

The plausibility of human exposure to microplastics has increased within the last years. Microplastics have been found in different food types including seafood, salt, sugar and beverages. So far, human health effects of microplastics after ingestion are unknown. Herein, we designed a novel, three- dimensional in vitro intestinal model consisting of the human intestinal epithelial cell lines...

Université de Fribourg

Functionalization of hydrophobic surfaces with antimicrobial peptides immobilized on a bio-interfactant layer

Corrales-Ureña, Yendry Regina ; Souza-Schiaber, Ziani ; Lisboa-Filho, Paulo Noronha ; Marquenet, Florian ; Michael Noeske, Paul-Ludwig ; Gätjen, Linda ; Rischka, Klaus

In: RSC Advances, 2019, vol. 10, no. 1, p. 376–386

The design of functionalized polymer surfaces using bioactive compounds has grown rapidly over the past decade within many industries including biomedical, textile, microelectronics, bioprocessing and food packaging sectors. Polymer surfaces such as polystyrene (PS) must be treated using surface activation processes prior to the attachment of bioactive compounds. In this study, a new peptide...

Université de Fribourg

Simple and fast evaluation of relaxation parameters of magnetic nanoparticles

Lemal, Philipp ; Balog, Sandor ; Ackermann-Hirschi, Liliane ; Taladriz-Blanco, Patricia ; Hirt, Ann M. ; Rothen-Rutishauser, Barbara ; Lattuada, Marco ; Petri-Fink, Alke

In: Journal of Magnetism and Magnetic Materials, 2020, vol. 499, p. 166176

The efficacy of magnetic hyperthermia treatment depends on the optimal available magnetic nanoparticles (MNPs) that are excited in a given alternating magnetic field and viscosity of the region of interest. In this regard, assessing the relevant relaxation parameters is of upmost importance and could improve the speed of development of efficient applications. Here, we demonstrate how to...

Université de Fribourg

Resolution limit of taylor dispersion: an exact theoretical study

Taladriz-Blanco, Patricia ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke ; Balog, Sandor

In: Analytical Chemistry, 2020, vol. 92, no. 1, p. 561–566

Taylor dispersion is a microfluidic analytical technique with a high dynamic range and therefore is suited well to measuring the hydrodynamic radius of small molecules, proteins, supramolecular complexes, macromolecules, nanoparticles and their self- assembly. Here we calculate an unaddressed yet fundamental property: the limit of resolution, which is defined as the smallest change in the...