March - 2021

Publications

This page lists most of our publications starting from 2014.

Total: ca. 200 Publications

Please refer to Google Scholar for a complete list.

Chemically Fueled Volume Phase Transition of Polyacid Microgels

Read the full article here: Angew. Chem. Int. Ed. 2021, 133, DOI.. click by J. Heckel, S. Loescher, R. T. Mathers, and A. Walther Microgels are soft colloids that show responsive behavior and are easy to functionalize for applications. They are considered key components for future smart colloidal material systems. However, so far microgel systems have almost exclusively been studied in classical responsive switching settings using external triggers, while internally organized

Wavelength‐Gated Adaptation of Hydrogel Properties via Photo‐Dynamic Multivalency in Associative Sta

Read the full article here: Angew. Chem. Int. Ed. 2021, 60, 4358 by S. Ludwanowski, O. Skarsetz, G. Creusen, D. Hoenders, P. Straub, and A. Walther Responsive materials, such as switchable hydrogels, have been largely engineered for maximum changes between two states. In contrast, adaptive systems target distinct functional plateaus between these maxima. Here, we demonstrate how the photostationary state (PSS) of an E/Z‐arylazopyrazole photoswitch can be tuned by the incident

Room‐Temperature Phosphorescence Enabled through Nacre‐Mimetic Nanocomposite Design

Read the full article here: Adv. Mater. 2021, 33, 2005973 by X. Yao, J. Wang, D. Jiao, Z. Huang, O. Mhirsi, F. Lossada, L. Chen, B. Haehnle, A. J. C. Kuehne, X. Ma, H. Tian, and A. Walther A generic, facile, and waterborne strategy is introduced to fabricate flexible, low‐cost nanocomposite films with room‐temperature phosphorescence (RTP) by incorporating waterborne RTP polymers into self‐assembled bioinspired polymer/nanoclay nanocomposites. The excellent oxygen barrier of

Hydrogel membranes made from crosslinked microgel multilayers with tunable density

Read the full article here: J. Membr. Sci. 2021, 620, 118912 by. D. J. Bell, S. Ludwanowski, A. Lueken, B. Sarikaya, A. Walther, and M. Wessling Membranes with precisely adjustable properties are needed to master the separation challenges in modern biochemical processes. Composite membranes are composed of a conventional membrane and an adaptive coating. Adaptive polymers like polymer brushes or hydrogels have proven to be excellent candidates for this challenge. In the prese

Modular functionalization and hydrogel formation via red-shifted and self-reporting cycloaddition

Read the full article here: Chem. Commun., 2021,57, 805 by S. Ludwanowski, D. Hoenders, K. Kalayci, H. Frisch, C. Barner-Kowollik, and A. Walther We present a modularly applicable, red-shifted and self-reporting photodynamic covalent crosslinker, abbreviated qStyPy, that performs [2+2] cycloadditions upon irradiation with 470 nm in water. The rational design of qStyPy increases its hydrophilicity due to a permanent charge and features a broad emission in the far-red/near-infr

A Modular Fluorescent Probe for Viscosity and PolaritySensing in DNA Hybrid Mesostructures

Read the full article here: Adv. Sci. 2021, 2003740 by S. Ludwanowski, A. Samanta, S. Loescher, C. Barner-Kowollik, and Andreas Walther There exists a critical need in biomedical molecular imaging and diagnostics for molecular sensors that report on slight changes to their local microenvironment with high spatial fidelity. Herein, a modular fluorescent probe, termed StyPy, is rationally designed which features i) an enormous and tunable Stokes shift based on twisted intramole

Autonomous Transient pH Flips Shaped by Layered Compartmentalization of Antagonistic Enzymatic React

Read the full article here: Angew. Chem. Int. Ed. 2020, 60, 3619 by X. Fan and A. Walther Transient signaling orchestrates complex spatiotemporal behaviour in living organisms via (bio)chemical reaction networks (CRNs). Compartmentalization of signal processing is an important aspect for controlling such networks. However, artificial CRNs mostly focus on homogeneous solutions to program autonomous self‐assembling systems, which limits their accessible behaviour and tuneabilit

Fuel-Driven Transient DNA Strand Displacement Circuitry with Self-Resetting Function

Read the full article here: J. Am. Chem. Soc. 2020, 142, 21102 by J. Deng and A. Walther Toehold-mediated DNA strand displacement (DSD) is a powerful strategy to engineer dynamics in DNA-based devices and for molecular computing. However, facile strategies for autonomously self-resettable DSD cascades with programmable lifetimes are still missing. Here, we concatenate an ATP-powered ligation/restriction network with toehold-mediated DSD reactions realizing ATP-driven transien

Programmable ATP-Fueled DNA Coacervates by Transient Liquid-Liquid Phase Separation

Read the full article here: Chem, 2020, 6, 3329 by J. Deng, and A. Walther Multivalency-driven liquid-liquid phase separation (LLPS) is essential for biomolecular condensates to facilitate spatiotemporal regulation of biological functions. Providing programmable model systems would help to better understand the LLPS processes in biology and furnish new types of compartmentalized synthetic reaction crucibles that exploit biological principles. Herein, we demonstrate a concept

pH Tuning of Water‐Soluble Arylazopyrazole Photoswitches

Read the full article here: Chem. Eur. J. 2020, 26, 132303 By S. Ludwanowski, M. Ari, K. Parison, S. Kalthoum, P. Straub, N. Pompe, S. Weber, M. Walter, and A. Walther Arylazopyrazoles are an emerging class of photoswitches with redshifted switching wavelength, high photostationary states, long thermal half‐lives and facile synthetic access. Understanding pathways for a simple modulation of the thermal half‐lives, while keeping other parameters of interest constant, is an imp

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