A5084930945- Surfactants and Colloidal Systems
- Advanced Polymer Synthesis and Characterization
- Polymer Surface Interaction Studies
- Electrostatics and Colloid Interactions
- Supramolecular Chemistry and Complexes
- Hydrogels: synthesis, properties, applications
- Metal-Organic Frameworks: Synthesis and Applications
- Protein Interaction Studies and Fluorescence Analysis
- Lipid Membrane Structure and Behavior
- Animal Vocal Communication and Behavior
- Crystallization and Solubility Studies
- Animal Behavior and Reproduction
- Health and Well-being Studies
- Supramolecular Self-Assembly in Materials
- Hepatitis C virus research
- Metal complexes synthesis and properties
- X-ray Diffraction in Crystallography
- Primate Behavior and Ecology
- Petroleum Processing and Analysis
- Pickering emulsions and particle stabilization
- Polyoxometalates: Synthesis and Applications
- RNA Interference and Gene Delivery
- Proteins in Food Systems
- Microbial bioremediation and biosurfactants
- Polymer crystallization and properties
Technion – Israel Institute of Technology
2021-2024
Leipzig University
2024
Johannes Gutenberg University Mainz
2022-2024
Technische Universität Berlin
2015-2022
Duke University
2022
Israel Institute
2021
University of North Carolina at Chapel Hill
1993
Hôpital Bichat-Claude-Bernard
1991
Department of Virology
1991
Université Claude Bernard Lyon 1
1991
Abstract A series of metal‐mediated cages, having multiple cavities, was synthesized from Pd II cations and tris‐ or tetrakis‐monodentate bridging ligands characterized by NMR spectroscopy, mass spectrometry, X‐ray methods. The peanut‐shaped [Pd 3 L 1 4 ] cage deriving the tris‐monodentate ligand could be quantitatively converted into its interpenetrated [5Cl@Pd 6 8 dimer featuring a linear {[Pd‐Cl‐] 5 Pd} stack as an unprecedented structural motif upon addition chloride anions. Small‐angle...
Amphiphilic polymer conetworks (APCN) were prepared in N,N-dimethylformamide (DMF) by the interconnection of four-arm star poly(vinylidene fluoride) (PVDF, Mn = 8800 Da) end-functionalized with benzaldehyde groups and poly(ethylene glycol) (PEG, 10 kDa) benzaacylhydrazide groups. The PVDF stars via reversible addition–fragmentation chain transfer polymerization vinylidene fluoride using a tetraxanthate agent. Equilibrium swelling APCNs various solvents was dependent on compatibility APCN...
The pH-triggered formation of supramolecular complexes between the cationic biopolysaccharide chitosan and an environmentally friendly anionic surfactant is exploited for formulation selective controlled-recovery systems. A strong advantage this system very small pH range in which binding/release process takes place. Because high responsiveness, chitosan-surfactant are employed sequestration various compounds by binding or releasing them from complexes. In particular, recovery a model...
Oppositely charged polyelectrolyte (PE) surfactant mixtures can self-assemble into a large variety of mesoscopic structures, so-called complexes (PESCs). These structures directly affect the macroscopic behavior such solutions. In this study, we investigated cationically PE JR 400 and anionic SDS with help different neutron scattering fluorescence methods. While an excess charges in semi-dilute solutions causes increase viscosity, it has been observed that reduces viscosity while...
Olfaction is one of the evolutionarily oldest senses and plays a fundamental role in foraging social interactions across mammals. In primates, olfaction now well recognized, but better investigated strepsirrhine platyrrhine primates than catarrhines. We observed sniffing behavior semi-free ranging Barbary macaques, Macaca sylvanus, at Affenberg Salem, Germany, to assess how frequently macaques sniff which contexts, affected by sex age. Focal observations 24 males females aged 1-25 years...
Hydrogels based on acylhydrazone end-linked Tetronic T904 four-armed amphiphilic star block copolymers show thermally-induced aqueous self-assembly and toughening, cross-link dissociation association traceable via simple 1 H NMR spectroscopy.
The ionic assembly of oppositely charged polyelectrolyte-surfactant complexes (PESCs) is often done with the aim constructing more functional colloids, for instance as advanced delivery systems. However, PESCs are not easily loaded a solubilisate due to intrinsic restrictions such complexes. This question was addressed from different starting point: by employing microemulsion droplets heavily surfactant systems and thereby avoiding potential solubilisation limitations beginning. We...
Abstract Eine Reihe metallvermittelt gebildeter Käfige mit mehreren Kavitäten wurde unter Verwendung von Pd II ‐Kationen und drei‐ oder vierzähnigen Liganden synthetisiert mittels NMR‐Spektroskopie, Massenspektrometrie Einkristallröntgenstrukturanalyse charakterisiert. Der Erdnuss‐förmige [Pd 3 L 1 4 ]‐Käfig auf Basis des dreizähnigen konnte durch Versetzen einem Chlorid‐Salz quantitativ in das interpenetrierte [5Cl@Pd 6 8 ]‐Dimer umgewandelt werden, eine lineare {[Pd‐Cl‐] 5 Pd}‐Stapelung...
Mixtures of oppositely charged polyelectrolyte (PE) and surfactant show rich structural behavior. The dynamics such self-assembled structures can be quite complex. For example, using dynamic light scattering (DLS), we observed a slow collective relaxation mode for mixtures the cationically PE JR 400 anionic SDS if concentration system is sufficiently high small excess charges present. A similar by fluorescence correlation spectroscopy (FCS). However, large quantitative discrepancy between...
We studied polyelectrolyte/microemulsion complexes (PEMECs) formed by the biopolymer sodium hyaluronate (NaHA) and cationic oil-in-water (O/W) microemulsion droplets. Around equimolar charge conditions, a two-phase region with liquid–liquid phase separation (coacervate formation) is observed, while mixed are at polyelectrolyte excess. The largest found close to boundary. detailed structure of these was determined combination static dynamic light scattering (SLS DLS), small-angle neutron...
Summary Herein we report on the preparation and structural characterization of six amphiphilic polymer conetworks (APCN) based end‐linked “core‐first” star block copolymers, comprising methyl methacrylate 2‐(dimethylamino)ethyl as monomer repeating units in hydrophobic hydrophilic blocks, respectively. The various APCNs differed either arm composition or molecular weight. APCN synthesis was accomplished via one‐pot, sequential group transfer polymerization (GTP) cross‐linker, monomer,...
Nanoemulsions (NEs) are metastable emulsions with droplet sizes between 20 and 100 nm a wide range of applications, for example, in polymerization, pharmaceutical cosmetic formulations, as drug delivery systems. Even though they not thermodynamic equilibrium, can be over relatively long times have the advantage that formed easily by low energy input methods. In particular, phase inversion concentration (PIC) method allows formation NEs dilution suitable mixture oil surfactants water. this...
Temperature control of rheological properties aqueous solutions can be achieved by the addition amphiphilic polymers that show temperature-dependent self-assembly. For this purpose, we explored three sets acrylamide-based block copolymers with BAB*-, B2AB*-, and B(AB*)2-type architectures, where "B" represents a permanently hydrophobic unit, "A" is hydrophilic block, "B*" thermoswitchable which undergoes phase transition lower critical solution temperature (LCST) type. Depending on specific...
Oil-in-water (O/W) microemulsion droplets are convenient carriers for hydrophobic molecules in an aqueous phase and used a wide range of applications. We studied weakly charged O/W complexed with oppositely polyacrylates that form long linear arrangements droplets. All samples showed rather low viscosities, which is contrast to similar systems hydrophobically interconnected Here, we applied small-angle neutron scattering, dynamic light scattering spin-echo spectroscopy characterise the...
Self-assembly is a key process in forming biological materials. Especially the interaction between amphiphiles and polyelectrolytes has been widely investigated recent years due to their potential application industry medicine, with special focus on gene therapy. Accordingly, we formation of lipoplexes by mixing cationic lipid DOTAP (1,2-dioleoyl-3-trimethylammonium-propane (chloride salt)) different anionic (PE), such as NaPA (sodium polyacrylate), CMC carboxymethyl cellulose) degrees...
We studied the directed self-assembly of two types complementary single-stranded DNA (ssDNA) strands [i.e., poly(dA) and poly(dT)] into more complex, organized, percolating networks in dilute solutions at surfaces. Understanding ssDNA 2D on surfaces is important for use such fabrication well-defined nanotechnological devices, as, instance, required nanoelectronics or biosensing. To control formation surfaces, it to know whether assemblies are formed already only during drying/immobilization...