Jonas Schubert

• Dr. rer. nat.
• Leibniz Institute of Polymer Research

Thermoresponsive hydrogels were 3D-printed with embedded gold nanorods (GNRs), which enable shape change through photothermal heating. GNRs were functionalized with bovine serum albumin and mixed with a photosensitizer and poly(N-isopropylacrylamide) (PNIPAAm) macromer, forming an ink for 3D printing by direct ink writing. A macromer-based approach...

Eine neue Studie aus Kanada zeigt, dass Seife und Reinigungstücher für die Reinigung nach dem Kontakt mit Brandrauch nicht geeignet sind. Sie können die Aufnahme der im Rauch enthaltenen Gefahrstoffe in den Körper sogar verstärken.

Plasmonic nanoparticles that can be manipulated with magnetic fields are of interest for advanced optical applications, diagnostics, imaging, and therapy. Alignment of gold nanorods yields strong polarization-dependent extinction, and use of magnetic fields is appealing because they act through space and can be quickly switched. In this work, catio...

Stretching individual living cells with light is a standard method to assess their mechanical properties. Yet, heat introduced by the laser light of optical stretchers may unwittingly change the mechanical properties of cells therein. To estimate the temperature induced by an optical trap, we introduce cell-sized, elastic poly(N-isopropylacrylamide...

Polyzyklische aromatische Kohlenwasserstoffe (PAK) kommen insbeson- dere in Brandrauch vor und machen diesen besonders gefährlich. Die krebser- regenden Stoffe müssen nach einem Einsatz von kontaminierten Hautpartien entfernt werden, um eine Beeinträchtigung der Gesundheit zu verhindern. Ein Problem bisher verbreiteter Reinigungsverfahren ist, dass...

The splashing of liquid drops onto a solid surface is important for a wide range of applications, including combustion and spray coating. As the drop hits the solid surface, the liquid is ejected into a thin horizontal sheet expanding radially over the substrate. Above a critical impact velocity, the liquid sheet is forced to separate from the soli...

Recently, N‐heterocyclic carbenes (NHCs) are explored as anchor groups to bind organic ligands to colloidal gold (i.e. gold nanoparticles, Au NPs), yet these efforts are confined to non‐conjugated ligands so far—that is, focused solely on exploiting the stability aspect. Using NHCs to link Au NPs and electronically active organic components, for ex...

Br‐NHC‐AuI‐Komplexe wurden als Ausgangspunkte für Kumada‐Polymerisationen zur Synthese von regioregulärem Poly(3‐hexylthiophen)‐NHC‐AuI verwendet. Nach Reduktion wurden P3HT‐NHC@Au NPs erhalten. Aufgrund der robusten und leitfähigen NHC‐Bindung zeigen die entsprechenden NPs nicht nur eine hervorragende thermische und Redoxstabilität, sondern auch e...

Bio-sourced nanoparticles have a range of desirable properties for therapeutic applications, including biodegradability and low immunogenicity. Glycogen, a natural polysaccharide nanoparticle, has garnered much interest as a component of advanced therapeutic materials. However, functionalizing glycogen for use as a therapeutic material typically in...

We demonstrate a novel colloidal self-assembly approach toward obtaining mechanically tunable, cost-efficient and low-loss plasmonic nanostructures that show pronounced optical anisotropy upon mechanical deformation. Soft lithography and template-assisted colloidal self-assembly are used to fabricate a stretchable periodic square lattice of gold na...

For negatively charged proteins (and protein-coated nanoparticles), charge inversion can be induced through the addition of hydrolyzable metal ions. In this study, protein-coated Au nanoparticles were used to investigate the influence of pH and various metal ions on the charge reversal and colloidal stability, as the addition of metal ions (Lewis a...

For many photonic applications, it is important to confine light of specific wavelength at a certain volume of interest at low losses. So far, it is only possible to use the polarized light perpendicular to the solid grid lines to excite waveguide plasmon polaritons in a waveguide supported hybrid structure. In our work, we use a plasmonic grating...

In this study, we present a novel and highly facile method for the synthesis of multi-responsive plasmonic nanoparticles with an interesting interfacial behavior. We used thiol-initiated photopolymerization technique to graft poly(N-isopropylacrylamide) onto the surface of protein-coated gold nanoparticles. The combination of the protein bovine ser...

Silver nanomaterials (AgNMs) are released into sewers and consequently find their way to sewage treatment plants (STPs). The AgNMs are transformed en route, mainly into silver sulfide (Ag2S), which is only sparingly soluble in water and therefore potentially less harmful than the original AgNMs. Here we investigated the toxicity and fate of differe...

Within the last two decades, the field of nanomedicine has not developed as successfully as has widely been hoped for. The main reason for this is the immense complexity of the biological systems, including the physico-chemical properties of the biological fluids as well as the biochemistry and the physiology of living systems. The nanoparticles' p...

Enzyme-catalyzed controlled radical polymerization represents a powerful approach for the polymerization of a wide variety of water-soluble monomers. However, in such an enzyme-based polymerization system, the macromolecular catalyst (i.e., enzyme) has to be separated from the polymer product. Here, we present a compelling approach for the separati...

In this work we show that different enzymes, such as horseradish peroxidase, glucose oxidase, laccase and catalase, can be directly immobilized onto plasmonic gold nanoparticles (NPs) and superparamagnetic iron oxide NPs simply via unspecific physical adsorption, yielding catalytically active and colloidally stable NP systems. The enzyme coating on...

When a nanomaterial enters a biological system, proteins adsorb onto the particle surface and alter the surface properties of nanoparticles, causing drastic changes in physicochemical properties such as hydrodynamic size, surface charge and aggregation state, thus giving a completely new and undefined physicochemical identity to the nanoparticles....