Philipp Vana
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View article: Self-assembled cellulosic superstructures with unanticipated high quantum yields
Self-assembled cellulosic superstructures with unanticipated high quantum yields Open
Nonconventional luminophores devoid of traditional, large π-conjugates often suffer from low solid-state fluorescence quantum yields (FLQYs). In parallel, self-assembled bowl-shaped and helical architectures at the micro- and macroscale ar…
View article: Helical Assembly of Long‐Chain Unsubstituted Poly( <i>Para</i> ‐Phenylene) Immobilized on Individual Cellulose Nanocrystals
Helical Assembly of Long‐Chain Unsubstituted Poly( <i>Para</i> ‐Phenylene) Immobilized on Individual Cellulose Nanocrystals Open
The synthesis of chiral unsubstituted poly( para ‐phenylene) (PPP) chains has remained elusive for decades, with the production of high‐molecular‐weight PPP still inaccessible to date. Drawing inspiration from the intrinsic structural chir…
View article: Amorphous–Crystalline Solid Transformation-Induced Self-Actuation of Bending-to-Straightening Behavior via Helical Deformation
Amorphous–Crystalline Solid Transformation-Induced Self-Actuation of Bending-to-Straightening Behavior via Helical Deformation Open
Bending-to-straightening behavior is vital for both natural processes and advanced materials design. Nonclassical crystallization pathways, particularly amorphous-crystalline transformations, offer opportunities to achieve such dynamic act…
View article: Enhanced water evaporation via coupled capillary transport and gelation in confined nanocrystal systems
Enhanced water evaporation via coupled capillary transport and gelation in confined nanocrystal systems Open
Drying in confined systems is a critical process with broad implications, spanning applications from materials science to water management in microscale technologies. Nevertheless, the coupled dynamics of transport and gelation in confined…
View article: Self‐Assembled Heterosymmetric Structure with Tunable Polarization Optics for Reversible Matrix Encryption
Self‐Assembled Heterosymmetric Structure with Tunable Polarization Optics for Reversible Matrix Encryption Open
Symmetric and asymmetric structures are generally taken as contradictory structures. Developing novel hierarchical self‐assembled structures by harmonically combining both symmetry and asymmetry, which we termed “heterosymmetric structures…
View article: Reversible Self‐Assembly of Monosaccharide‐Based Nanoparticles With Reversible Fluorescence Modulation
Reversible Self‐Assembly of Monosaccharide‐Based Nanoparticles With Reversible Fluorescence Modulation Open
Reversible self‐assembly of nanoparticles remains challenging due to limited molecular mobility. Moreover, reported successful examples typically rely on inorganic‐core nanoparticles that require surface pre‐functionalization with specific…
View article: Local Hydrogen Concentration and Distribution in Pd Nanoparticles: An In Situ STEM‐EELS Approach
Local Hydrogen Concentration and Distribution in Pd Nanoparticles: An In Situ STEM‐EELS Approach Open
Local detection of hydrogen concentration in metals is of central importance for many areas of hydrogen technology, such as hydrogen storage, detection, catalysis, and hydrogen embrittlement. A novel approach to measure the hydrogen concen…
View article: Ultrasonic Control of Polymer-Capped Plasmonic Molecules
Ultrasonic Control of Polymer-Capped Plasmonic Molecules Open
Plasmonic molecules (PMs) composed of polymer-capped nanoparticles represent an emerging material class with precise optical functionalities. However, achieving controlled structural changes in metallic nanoparticle aggregation at the nano…
View article: Self‐assembled small molecule spherulites under mild conditions: High solid‐state quantum yield and unique interconnected structural and fluorescent colors
Self‐assembled small molecule spherulites under mild conditions: High solid‐state quantum yield and unique interconnected structural and fluorescent colors Open
Spherulites are generally fabricated from cooling polymer melts, while their fabrication under mild conditions or from small molecule materials has been barely reported. Besides, organic luminescent molecules typically suffer from low quan…
View article: Dehydration regulates structural reorganization of dynamic hydrogels
Dehydration regulates structural reorganization of dynamic hydrogels Open
The dehydration process is widely recognized as a significant phenomenon in nature. Hydrogels, which are important functional materials with high water content and crosslinked networks, encounter the issue of dehydration in their practical…
View article: Inside Cover: 2D Plasmonic Molecules via Hydrogen Bond Interaction between Polymer‐Grafted Nanoparticles (Angew. Chem. Int. Ed. 47/2023)
Inside Cover: 2D Plasmonic Molecules via Hydrogen Bond Interaction between Polymer‐Grafted Nanoparticles (Angew. Chem. Int. Ed. 47/2023) Open
2D plasmonic molecules are constructed by hydrogen bond interaction between a donor–acceptor pair of polymer-grafted gold nanoparticles. As demonstrated in the Research Article (e202309798) by Yingying Cai and Philipp Vana, the weak yet mu…
View article: 2D Plasmonic Molecules via Hydrogen Bond Interaction between Polymer‐Grafted Nanoparticles
2D Plasmonic Molecules via Hydrogen Bond Interaction between Polymer‐Grafted Nanoparticles Open
The use of macromolecular design features to regulate non‐covalent bonding on the nanoscale is a young and emerging fabrication strategy for advanced nanostructures. For the first time, we describe a self‐assembly method to create a series…
View article: Thermoresponsive hydrogels with sulfated polysaccharide-derived copolymers: the effect of carbohydrate backbones on the responsive and mechanical properties
Thermoresponsive hydrogels with sulfated polysaccharide-derived copolymers: the effect of carbohydrate backbones on the responsive and mechanical properties Open
Thermoresponsive hydrogels based on ionic cellulose/chitosan are widely used various fields, such as smart windows and tissue engineering, while the effect of carbohydrate backbones of cellulose/chitosan on the thermal response and mechani…
View article: Free-Radical Propagation Rate Coefficients of Diethyl Itaconate and Di-n-Propyl Itaconate Obtained via PLP–SEC
Free-Radical Propagation Rate Coefficients of Diethyl Itaconate and Di-n-Propyl Itaconate Obtained via PLP–SEC Open
The propagation step is one of the key reactions in radical polymerization and knowledge about its kinetics is often vital for understanding and designing polymerization processes leading to new materials or optimizing technical processes.…
View article: Large-pore mesoporous silica: template design, thin film preparation and biomolecule infiltration
Large-pore mesoporous silica: template design, thin film preparation and biomolecule infiltration Open
New block co-polymer enable wide pore structures, suitable for biomolecule infiltration. These new porous thin films were compared to standard Pluronic based mesoporous layers, both, steric and charge effects on inflitration were assessed.
View article: Gold nanoparticle ring arrays from core–satellite nanostructures made to order by hydrogen bond interactions
Gold nanoparticle ring arrays from core–satellite nanostructures made to order by hydrogen bond interactions Open
Polymer-grafted gold nanoparticles are attached to silica nanoparticles forming core–satellite structures, which rearrange into ring arrays when cast to surface. By etching away the silica core, ring-shaped patterns of gold nanoparticles a…
View article: Efficacy of occlusive wraps used for delivery room care
Efficacy of occlusive wraps used for delivery room care Open
Background Guidelines advise for more than 20 years to use occlusive plastic wraps for temperature management during delivery room care but data on efficacy of different types of wrap are still scarce. Methods A random sample of seven diff…
View article: Increasing the Gas Barrier Properties of Polyethylene Foils by Coating with Poly(methyl acrylate)-Grafted Montmorillonite Nanosheets
Increasing the Gas Barrier Properties of Polyethylene Foils by Coating with Poly(methyl acrylate)-Grafted Montmorillonite Nanosheets Open
Low-density polyethylene (LDPE) foils were coated with a thin film of polymer-grafted Montmorillonite (MMT) nanosheets, which form a barrier against gas diffusion due to their unique brick-and-mortar arrangement. The MMT nanosheets were gr…
View article: Refining Reactivity Ratios in the Copolymerization of Styrene and Methyl Methacrylate by EasySpin/MATLAB Simulations and Electron Paramagnetic Resonance Spectroscopy
Refining Reactivity Ratios in the Copolymerization of Styrene and Methyl Methacrylate by EasySpin/MATLAB Simulations and Electron Paramagnetic Resonance Spectroscopy Open
Electron paramagnetic resonance (EPR) spectra of the ensemble of growing macroradicals are recorded during the radical copolymerization of styrene‐d8 and methyl methacrylate (MMA) for various comonomer compositions and subsequently modeled…
View article: Near-Infrared-Triggered Photothermal Aggregation of Polymer-Grafted Gold Nanorods in a Simulated Blood Fluid
Near-Infrared-Triggered Photothermal Aggregation of Polymer-Grafted Gold Nanorods in a Simulated Blood Fluid Open
Gold nanorods were decorated with thermoresponsive copolymers of tailored architecture and constructed from N-isopropyl acrylamide and acrylamide. The copolymers were prepared via reversible addition-fragmentation chain transfer polymeriza…
View article: Enhancing the Mechanical Properties of Matrix‐Free Poly(Methyl Acrylate)‐Grafted Montmorillonite Nanosheets by Introducing Star Polymers and Hydrogen Bonding Moieties
Enhancing the Mechanical Properties of Matrix‐Free Poly(Methyl Acrylate)‐Grafted Montmorillonite Nanosheets by Introducing Star Polymers and Hydrogen Bonding Moieties Open
Matrix‐free nanocomposite films of poly(methyl acrylate) (PMA) and montmorillonite (MMT) nanosheets that imitate the microscopic structure of nacre are developed and their mechanical properties are studied in detail via tensile testing. Th…
View article: Macroscalar Helices Co‐Assembled from Chirality‐Transferring Temperature‐Responsive Carbohydrate‐Based Bolaamphiphiles and 1,4‐Benzenediboronic Acid
Macroscalar Helices Co‐Assembled from Chirality‐Transferring Temperature‐Responsive Carbohydrate‐Based Bolaamphiphiles and 1,4‐Benzenediboronic Acid Open
We present the first example of macroscalar helices co‐assembled from temperature‐responsive carbohydrate‐based bolaamphiphiles (CHO‐Bolas) and 1,4‐benzenediboronic acid (BDBA). The CHO‐Bolas contained hydrophilic glucose or mannose moieti…
View article: Nanoengineering with RAFT polymers: from nanocomposite design to applications
Nanoengineering with RAFT polymers: from nanocomposite design to applications Open
Reversible addition–fragmentation chain-transfer (RAFT) polymerization is a powerful tool for the precise formation of macromolecular building blocks that can be used for the construction of well-defined nanocomposites.
View article: Mannosylated fluorescent cellulose‐based glycopolymers for stable uniform nanoparticles
Mannosylated fluorescent cellulose‐based glycopolymers for stable uniform nanoparticles Open
In living organisms, carbohydrate‐protein interactions play key roles in physiological and pathological processes, which are amplified by the “glycol‐cluster effect.” In this work, we synthesized novel fluorescent cellulose derivatives bea…
View article: Elucidating the Topology and Physical Properties of Triblock Copolymers Using Ion Mobility Mass Spectrometry
Elucidating the Topology and Physical Properties of Triblock Copolymers Using Ion Mobility Mass Spectrometry Open
A combination of electrospray ionization (ESI) and ion mobility mass spectrometry (IMMS) is used to successfully determine the characteristic ratio ( C n ) of homopolymers and triblock copolymers. Two different copolymer systems are analyz…
View article: Tuning the Mechanical Properties of Poly(Methyl Acrylate) via Surface‐Functionalized Montmorillonite Nanosheets
Tuning the Mechanical Properties of Poly(Methyl Acrylate) via Surface‐Functionalized Montmorillonite Nanosheets Open
Polymer layered silicate nanocomposites (PLSNs) made of montmorillonite (MMT) nanosheets and poly(methyl acrylate) (PMA) are synthesized and systematically characterized. MMT is first modified with a surface‐bound monomer and then function…
View article: The Next 100 Years of Polymer Science
The Next 100 Years of Polymer Science Open
The year 2020 marks the 100th anniversary of the first article on polymerization, published by Hermann Staudinger. It is Staudinger who realized that polymers consist of long chains of covalently linked building blocks. Polymers have had a…
View article: Supramolecular Self‐Assembly of β<sup>3</sup>‐Peptides Mediated by Janus‐Type Recognition Units
Supramolecular Self‐Assembly of β<sup>3</sup>‐Peptides Mediated by Janus‐Type Recognition Units Open
To gain mechanistic insights, natural systems with biochemical relevance are inspiring for the creation of new biomimetics with unique properties and functions. Despite progress in rational design and protein engineering, folding and intra…