A5078734112- Advanced Polymer Synthesis and Characterization
- Polymer Nanocomposites and Properties
- Block Copolymer Self-Assembly
- Polymer crystallization and properties
- Surfactants and Colloidal Systems
- biodegradable polymer synthesis and properties
- Silicone and Siloxane Chemistry
- Polymer composites and self-healing
- Lipid Membrane Structure and Behavior
- Zeolite Catalysis and Synthesis
- Electrospun Nanofibers in Biomedical Applications
- Synthesis and properties of polymers
- Material Dynamics and Properties
- Conducting polymers and applications
- Spectroscopy and Quantum Chemical Studies
- Nanoparticle-Based Drug Delivery
- X-ray Diffraction in Crystallography
- Polyoxometalates: Synthesis and Applications
- Protein Structure and Dynamics
- Mesoporous Materials and Catalysis
- Enzyme Structure and Function
- Phase Equilibria and Thermodynamics
- Polydiacetylene-based materials and applications
- Machine Learning in Materials Science
- Chemical Synthesis and Characterization
Czech Academy of Sciences, Institute of Macromolecular Chemistry
2015-2025
University of Pardubice
2003-2017
Czech Academy of Sciences
2002-2013
University of Belgrade
2013
Austrian Academy of Sciences
2008
Boston University
2007
TU Wien
2005
Forschungszentrum Jülich
2005
University of Vienna
2005
Kiel University
1996
Epoxy−amine networks were modified with well-defined inorganic building blockspolyhedral oligomeric silsesquioxanes (POSS). POSS molecules incorporated in the organic−inorganic as dangling units of a network chain or junctions. Mono- polyepoxide monomers used to prepare two types networks. The structure POSS-containing networks, including evolution during formation, was determined by SAXS, WAXS, and TEM. pendant on shows strong tendency toward aggregation crystallization, depending organic...
Small-angle X-ray scattering (SAXS) and elastic quasi-elastic neutron techniques were used to investigate the high-pressure-induced changes on interactions, low-resolution structure dynamics of lysozyme in solution. SAXS data, analysed using a global-fit procedure based new approach for hydrated protein form factor description, indicate that completely maintains its globular up 1500 bar, but significant modifications protein-protein interaction potential occur at approximately 600-1000 bar....
Novel ferrite/polyurethane nanocomposites were synthesized using the in situ polymerization method after addition of different spinel nanoferrite particles (copper, zinc, and copper–zinc) examined as potential coatings for medical devices implants vascular tissue engineering. The influence type on structure functional characteristics polyurethane composites was investigated by FTIR, SWAXS, AFM, TGA, DSC, nanoindentation, swelling behavior, water contact angle, absorption measurements....
Synchrotron small-angle X-ray scattering (SAXS) was applied for studying the effects of hydrostatic pressure and temperature on structural behavior fully hydrated tetradecane (TC)-loaded monoolein (MO) systems. Our main attention focused investigating impact isobaric isothermal changes stability inverted type discontinuous Fd3m cubic phase as compared to hexagonal (H(2)) liquid crystalline phase. The present results show that compressing TC-loaded under conditions induces a significant...
An improved transform technique has been developed [Gerber (1983). Thesis, Wilhelm-Pieck-University Rostock, German Democratic Republic] for calculating the particle size distribution N(R) spherical particles with radii R from small-angle X-ray scattering data. This method permits to be calculated analytical expressions that were derived point collimation and infinitely long slit collimation. A special procedure introduced in order reduce termination errors. The described those by Schmidt...
Omega-O-acyl ceramides such as 32-linoleoyloxydotriacontanoyl sphingosine (Cer[EOS]) are essential components of the lipid skin barrier, which protects our body from excessive water loss and penetration unwanted substances. These drive assembly to epidermal-specific long periodicity phase (LPP), structurally much different than conventional bilayers. Here, we synthesized Cer[EOS] with selectively deuterated segments ultralong N-acyl chain or 13C-labeled linoleic acid studied their molecular...
Desulfation of cholesterol sulfate (CholS) to (Chol) is an important event in epidermal homeostasis and necessary for stratum corneum (SC) barrier function. The CholS/Chol ratio decreases during SC maturation but remains high pathological conditions, such as X-linked ichthyosis, characterized by dry scaly skin. aim this study was characterize the influence molar on structure, dynamics, permeability lipid model mixtures. We synthesized deuterated CholS investigated models with specifically...
The morphology of gels prepared from a silica/titania single-source precursor (1), obtained by reaction 3-oxoethyl-6-trimethoxysilyl-hexan-2-one with Ti(OiPr)4, was investigated small-angle X-ray scattering (SAXS) through all stages the preparation process, that is, gelation, aging, drying, and calcination. same investigations were performed for mixtures 1 Si(OEt)4. Immediately after start small primary particles are formed, size which (r = 0.5 ± 0.1 nm) remains constant gelation aging...
We compared the results of various microscale indentation creep (microcreep) measurements with macroscale tensile (macrocreep) three common polymers: high-density polyethylene (PE), polypropylene (PP), and polystyrene (PS). The main objective was to verify if short-term microcreep experiments could predict long-term macrocreep behavior selected polymers, whose properties ranged from very soft ductile (PE) hard brittle second compare several predictive schemes: empirical power law model (PL)...
A compact high pressure cell and its control environment designed for small- wide-angle x-ray scattering experiments under hydrostatic up to 3000 bar temperatures between −20 °C +80 are described. With this system can be performed at constant temperature with a conventional laboratory source it easily modified carry out time resolved jump studies synchrotron radiation sources. The computer-aided adjustment has calibrated accuracy of ±0.5%, is computer-controlled precision ±0.05 °C....
Segmented polyurethanes (PURs) were prepared from α,ω-dihydroxypoly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) (PPO–PDMS) as the soft segment and 4,4′-diphenylmethane diisocyanate 1,4-butanediol hard segment, via two-step polyaddition process in solvent mixture. The content of segments is range 10 to 60 wt %. structure composition PURs are determined by 1H NMR, 13C ATR-FTIR spectroscopy. Incorporation PPO–PDMS leads improvements thermal stability. Small- wide-angle...
We present the first report on effects of hydrostatic pressure colloidally stabilized lipid nanoparticles enveloping inverse nonlamellar self-assemblies in their interiors. These internal were systematically tuned into bicontinuous cubic (Pn3m and Im3m), micellar (Fd3m), hexagonal (H2), (L2) phases by regulating lipid/oil ratio as was varied from atmospheric to 1200 bar back pressure. The these compared with those equilibrium bulk, nondispersed counterparts, namely, liquid-crystalline...
Mucoadhesive buccal films (MBFs) provide an innovative way to facilitate the efficient site-specific delivery of active compounds while simultaneously separating lesions from environment oral cavity. The structural diversity these complex multicomponent and mostly multiphase systems as well experimental strategy for their characterization at molecular scale with atomic resolution were demonstrated using MBFs ciclopirox olamine (CPX) in a poly(ethylene oxide) (PEO) matrix case study. A...
An instrument to facilitate small- and wide-angle x-ray scattering measurements of samples under elevated hydrostatic pressures or exposed pressure jumps is described. Pressure from atmospheric up 0.35 GPa produced by a motor-driven, piston-type generator transferred through network containing pressurizing liquid sample cell. The cell, with the optical path length 1.6 mm, has two Beryllium windows total transmission 0.4 (for x rays λ=0.154 nm) low background scattering. Scattering can be...
We examined the kinetics of transformation from lamellar (LAM) to hexagonally packed cylinder (HEX) phase for triblock copolymer, polystyrene-b-poly (ethylene-co-butylene)-b-polystyrene (SEBS) in dibutyl phthalate (DBP), a selective solvent polystyrene (PS), using time-resolved small-angle X-ray scattering (SAXS). observe HEX with EB block cores at lower temperature than that observed LAM due selectivity DBP PS block. Analysis SAXS data deep quench well below LAM−HEX transition shows occurs...
Polymer nanocomposites of epoxies with a novel filler, amino-functional butyltin oxide cage (stannoxane), were prepared and characterized. The nanofiller displays promising antioxidizing effect, besides mechanical matrix reinforcement. reinforcement can be assigned to physical interactions among the polymer bonded nanofiller. Moreover, stannoxane undergoes rearrangement larger poly nano-objects at higher temperatures, which highly reduces its extractability: it is practically not extractable...
A combination of new thermoresponsive statistical polyoxazolines, poly[(2-butyl-2-oxazoline)- stat -(2-isopropyl-2-oxazoline)] [pBuOx- co -piPrOx], with different hydrophobic moieties and F127 surfactant as a template system for the creation thermosensitive nanoparticles radionuclide delivery has recently been tested [Pánek, Filippov, Hrubý, Rabyk, Bogomolova, Kučka & Stěpánek (2012). Macromol. Rapid Commun. 33 , 1683–1689]. It was shown that presence triblock copolymer in solution...
Hybrid organic–inorganic epoxies containing the heavier POSS homologue, n-butylstannoxane dodecamer, incorporated as an inert block, a linear unit, and network junction were prepared. This nanometer-sized inorganic cage is especially attractive because of its chemical reactivity (besides mechanical matrix reinforcement). It can undergo oxidative cross-linking reactions with matrix, or at elevated temperature in absence air, it oligomerize to larger nanodomains, thus generating additional...