Three-dimensional (3D) printing is a promising technology to develop customized biomaterials in regenerative medicine. However, for the majority of printable (bioinks) there always compromise between excellent printability fluids and good mechanical properties solids. soft materials based on transition from fluid gel state challenging because difficulties control such as well maintain uniform conditions three-dimensionally. To solve these challenges, facile chemical strategy development...

Two-photon polymerization (2PP) is becoming increasingly established as additive manufacturing technology for microfabrication due to its high-resolution and the feasibility of generating complex parts. Until now, high resolution 2PP also bottleneck, it limited throughput therefore restricted application production microparts. Thus, mechanical properties materials can only be characterized using nonstandardized specialized microtesting methods. Due recent advances in technology, now possible...

Abstract Photodegradable hydrogels have emerged as useful platforms for research on cell function, tissue engineering, and delivery their physical chemical properties can be dynamically controlled by the use of light. The photo‐induced degradation such hydrogel systems is commonly based integration photolabile o ‐nitrobenzyl derivatives to backbone, because linkers cleaved means one‐ two‐photon absorption. Herein we describe a cytocompatible click‐based containing ester linkages between...

A photolabile ruthenium-based complex, [Ru(bpy)2 (4AMP)2 ](PF6 )2 , (4AMP=4-(aminomethyl)pyridine) is incorporated into polyurea organo- and hydrogels via the reactive amine moieties on photocleavable 4AMP ligands. While showing long-term stability in dark, cleavage of pyridine-ruthenium bond upon irradiation with visible or near-infrared (in a two-photon process) leads to rapid de-gelation supramolecular gels, thus enabling spatiotemporal micropatterning by photomasking pulsed NIR-laser irradiation.

Most quadrupolar molecules designed for large two-photon absorption cross section have been shown to undergo symmetry breaking upon excitation the S1 state. This was originally deduced from their strong fluorescence solvatochromism and later visualized in real time using transient infrared spectroscopy. For not containing clear IR marker modes, however, a specific real-time observation of process remains lacking. Here we show that this can be resolved broadband upconversion spectroscopy by...

Abstract The nature of the electronic excited state many symmetric multibranched donor–acceptor molecules varies from delocalized/multipolar to localized/dipolar depending on environment. Solvent-driven localization breaks symmetry and traps exciton in one branch. Using a combination ultrafast spectroscopies, we investigate how such excited-state breaking affects photochemical reactivity quadrupolar octupolar A–( π -D) 2,3 with photoisomerizable A– –D branches. Excited-state is identified by...

A series of nine soluble, symmetric chalcogenophenes bearing hexyl-substituted triphenylamines, indolocarbazoles, or phenylcarbazoles was designed and synthesized as potential two-photon absorption (2PA) initiators. detailed photophysical analysis these molecules revealed good 2PA properties the and, in particular, a strong influence selenium on cross sections, rendering materials especially promising new photoinitiators. Structuring threshold tests proved efficiency broad spectral...

Abstract The growing importance of submicrometer‐structured surfaces across a variety different fields has driven progress in light manipulation, color diversity, water‐repellency, and functional enhancements. To enable mass production, processes like hot‐embossing (HE), roll‐to‐roll replication (R2R), injection molding (IM) are essential due to their precision material flexibility. However, these tool‐based manufacturing (TBM) techniques requiring metal molds, which time‐consuming expensive...

Photodynamic therapy (PDT) involves a photosensitizing agent activated with light to induce cell death. Two-photon excited PDT (TPE-PDT) offers numerous benefits compared traditional one-photon induced PDT, including an increased penetration depth and precision. However, the in vitro profiling comparison of two-photon photosensitizers (PS) are still troublesome. Herein, we report development screening platform TPE-PS using 3D osteosarcoma culture. The was tested three different (2P) active...

Abstract Photodegradable hydrogels have emerged as useful platforms for research on cell function, tissue engineering, and delivery their physical chemical properties can be dynamically controlled by the use of light. The photo‐induced degradation such hydrogel systems is commonly based integration photolabile o ‐nitrobenzyl derivatives to backbone, because linkers cleaved means one‐ two‐photon absorption. Herein we describe a cytocompatible click‐based containing ester linkages between...

A study of two-photon polymerization initiators is presented.

Platinum (Pt) is an interesting material for many applications due to its high chemical resilience, outstanding catalytic activity, electrical conductivity, and melting point. However, microstructuring especially 3D of platinum a complex process, based on expensive specialized equipment often suffering from very slow processing speeds. In this work, organic-inorganic photoresins, which can be structured using direct optical lithography as well two-photon (TPL) with submicrometer resolution...

Abstract Advancements in hybrid sol‐gel technology have provided a new class of holographic materials as photopolymerizable glasses. Recently, number photosensitive glass compositions with high dynamic range and spatial resolution been reported their excellent capability for volume holography has demonstrated. Nevertheless, challenges remain, particularly relation to the processing time environmental stability these materials, that strongly affect performance durability fabricated holograms....

Abstract A generally applicable direct synthesis of cyanoarenes from quinones is presented. Particular emphasis placed on the preparation precursors and target molecules relevant for organic materials, including halogenated larger cyanated acenes. The reaction work‐up protocols are adjusted challenges presented by different substrates products. Screening results initial optimization given to further facilitate adaptation other synthetic problems. universality finally highlighted successful...

The z-scan technique has become a standard method to measure 2-photon absorption (2PA) properties of materials used for applications.Here we present completely automated, easily tunable setup spectral scanning.An algorithm collecting the required laser beam parameters allows reliably determine optimal working window newly synthesized 2PA photoinitiators (PI) two-photon polymerization (2PP) in wide range.A complete spectrum (3 measurements per wavelength 10 nm steps) can be obtained within an...

Abstract Der lichtempfindliche Rutheniumkomplex [Ru(bpy) 2 (4AMP) ](PF 6 ) (4AMP=4‐(Aminomethyl)pyridin) wurde über die reaktiven Aminogruppen der durch Licht abspaltbaren 4AMP‐Liganden in Polyharnstoff‐Organo‐ oder ‐Hydrogele eingebaut. Im Dunkeln sind diese Gele sehr stabil. Durch Bestrahlen mit sichtbarem NIR‐Strahlung (letzteres mittels Zweiphotonenabsorption) werden Ruthenium‐Pyridin‐Bindungen gespalten, was zum Abbau des supramolekularen Gels führt. Dies ermöglicht eine räumlich und...

A novel synthesis of cyanoarenes from quinones by using PCl₃ as the reagent for reductive aromatization cyanohydrin intermediates is reported. In situ IR spectroscopic measurements were conducted to monitor reactions and develop a convenient one-pot protocol. 1,4-Dicyanobenzene 9,10-dicyanoanthracene prepared new procedure.

A photolinker for formation of disulfide-crosslinked hydrogels via light-triggered thiol–ene conjugation has been developed. Hydrogels can be patterned two-photon cleavage disulfide-linkages in the presence a active compound.

Abstract Photopolymer derived carbon grows in popularity, yet the range available feature sizes is limited. Herein, focus on expanding field to low surface volume ratio (SVR) structures. A high temperature acrylic photopolymerizable precursor with FTIR and DSC described a thermal inert‐gas treatment developed for producing architected mm scale SVR of 1.38×10 −3 µm −1 . Based thermogravimetric analysis mass spectrometry, two regimes activation energies ≈79 169 kJ mol are distinguished, which...

The hardmetal industry is continuously seeking for (Co, Ni)-free binder alternatives. Several attempts have been made to use FeMn binders, Mn being a very effective austenite stabilizer. Substitution of Co binders based comes along with many challenges such as: narrow carbon windows, evaporation during sintering or the formation stable Mn-oxides. This work presents an overview on phase in hardmetals different contents prepared from FeMn, FeMnSi and FeMnNi binders. Due efficient role as...

Event Abstract Back to Two-photon degradation of a hyaluronic acid based hydrogel using two-photon initiator as photosensitizer Markus Lunzer1, 2, Dmitri Ossipov3, Jöns Hilborn3, Peter Gruber1, Katja Hölzl1, Marica Markovic1, Jürgen Stampfl1, Robert Liska2 and Aleksandr Ovsianikov1 1 Vienna University Technology, Institute Materials Science Austria 2 Applied Synthetic Chemistry, 3 Uppsala University, for Life Laboratory, Department Chemistry-Ångström Sweden Introduction: Recent efforts in...

Correction for ‘Towards efficient initiators two-photon induced polymerization: fine tuning of the donor/acceptor properties’ by Brigitte Holzer <italic>et al.</italic>, <italic>Mol. Syst. Des. Eng.</italic>, 2019, DOI: 10.1039/c8me00101d.

Microstructured platinum (Pt) is of great importance in a variety applications from electronics, sensors, microelectromechanical systems, Lab-on-a-Chip devices as well medical implants such the cochlear implant. The high electrical conductivity, melting point, chemical resilience, catalytic activity, and biocompatibility make Pt material choice these applications. However, microstructuring especially 3D challenging mostly done using vapour-based techniques, which are restricted achievable...

Event Abstract Back to Poly(vinyl alcohol) based hydrogels for 3D biomaterial constructs Stefan Baudis1, Daniel Bomze1, Markus Lunzer1, 2, Jürgen Stampfl2, Aleksandr Ovsianikov2 and Robert Liska1 1 Vienna University of Technology, Institute Applied Synthetic Chemistry, Austria 2 Materials Science Introduction: (PVA) is a water soluble, odorless, tasteless, white non-toxic polymer widely used in industry, e.g., as additive food cosmetic products. These properties, taken together with the...