A5001682352- Advanced NMR Techniques and Applications
- Solid-state spectroscopy and crystallography
- NMR spectroscopy and applications
- Supramolecular Self-Assembly in Materials
- Molecular spectroscopy and chirality
- Electron Spin Resonance Studies
- Ionic liquids properties and applications
- Advanced Cellulose Research Studies
- Fuel Cells and Related Materials
- Lipid Membrane Structure and Behavior
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Hydrogels: synthesis, properties, applications
- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Magnetism in coordination complexes
- Crystal Structures and Properties
- Spectroscopy and Quantum Chemical Studies
- High voltage insulation and dielectric phenomena
- Advanced MRI Techniques and Applications
- Molecular Sensors and Ion Detection
- Analytical Chemistry and Chromatography
- Crystallization and Solubility Studies
- Supercapacitor Materials and Fabrication
- Biochemical effects in animals
Institute of Molecular Physics of the Polish Academy of Sciences
2015-2024
Polish Academy of Sciences
2015-2024
Adam Mickiewicz University in Poznań
2023
University of Illinois Chicago
1987-1991
Illinois College
1987
The solvent effect on organogel formation in nitrobenzene and chlorobenzene using 1,2-O-(1-ethylpropylidene)-α-d-glucofuranose (1) as the gelator is presented. Fourier transform infrared (FTIR) spectroscopy revealed that hydrogen bonding between molecules of 1 main driving force for self-aggregation. gels are characterized by different hydrogen-bonding patterns, which reflected a microstructure networks. morphology fibers consists straight, rod-like, thinner fibers, comparison to elongated...
A new proton conducting material with a possible application as membrane in fuel cells is synthesized. It formed by nanocrystalline cellulose (NCC) doped different concentration of the imidazole molecules (Im) used "dry" species. The nanocomposites (NCC-Im) are obtained form films. Their chemical composition, thermal properties, and electric conductivity determined elementary thermogravimetric analysis, differential scanning calorimetry impedance spectroscopy methods, respectively....
The structure and proton tautomerism of imidazole-doped cellulose (Cell-Im), an excellent solid state conductor, has been studied by 15N solid-state NMR techniques. 1H–15N HETCOR experiments allowed us to assign the water cellulose–OH resonances establish connectivities. CPMAS showed that imidazole is immobile its quenched below 263 K, whereas at higher temperatures, a broad distribution slow fast exchanging protons observed, where fraction latter increases with temperature. found be coupled...
Abstract To investigate the effect of cellulose matrix on diffusion and conductivity properties ionogels formed with BMIMCl ionic liquid (IL), two types samples were made micro (CMC) nano (CNC) cellulose. The interactions IL studied by 1 H 13 C NMR solid-state spectroscopy. cation [BMIM] + self-diffusion coefficient was calculated based Fast Field Cycling relaxation measurements. measured thermal scanning conductometry method. spectra at room temperature revealed that in CNC-based ionogel...
The relaxation processes in cellulose, methyl hydroxypropyl and hydroxypropylmethyl cellulose were studied by dielectric spectroscopy.The spectra for these polysaccharides measured the frequency range from 100 Hz to 1 MHz temperature 450 K.The data described Arrhenius Eyring equations interpreted as due a local motion of chain segments via glucosidic linkages, so-called β-relaxation.The same process was also determined polymer 240-270 K.At higher another mechanism occurs reorientation side...
In this work, we report the complementary studies of supramolecular organogels composed a newly synthesized low molecular mass gelator 4-(4-morpholinyl)-3-nitro-benzoylhydrazide (1) with benzene, toluene, and p-xylene. Intermolecular hydrogen bonding π–π stacking interactions are main driving forces promoting gelation system self-assembly new molecules. The former were revealed by FT-IR Raman studies, whereas latter ones postulated on basis structure gelator, UV-Vis spectra comparison...
A new proton conductor based on 1H-1,2,3-triazole doped nanocrystalline cellulose (2.66 CNC-Tri) has been synthesized for possible use as an electrolyte in exchange membrane (PEM) cells. The physicochemical properties of 2.66 CNC-Tri were determined and compared with those imidazole-doped (1.17 CNC-Im) pure (CNC). composites obtained the form a film their synthesis proceeded under vacuum. maximum conductivity was measured to be 0.1 × 10−4 S/m at 175 °C that 1.17 CNC-Im 1.6 10−2 155 °C,...
The studies of the gel-to-sol phase transition by Raman, FT-IR, and 1H NMR methods gel made low molecular weight organogelator 1,2-O-(1-ethylpropylidene)-α-d-glucofuranose with toluene as solvent are reported. FT-IR spectra revealed existence a hydrogen bond network formed gelator molecules in crystalline phase. In both phases, formation is dominated self-interaction. Upon gelation, only one stretching band infrared absorption modes να, assigned to O(6)H hydroxyl protons gelator, shifted Δυα...
The dynamics of bulk toluene and confined in the 1,2-O-(1-ethylpropylidene)-α-D-glucofuranose gel was studied using (1)H field-cycling nuclear magnetic resonance relaxometry. proton spin-lattice relaxation time T(1) measured as a function field strength temperature. observed dispersion frequency range 10(4)-10(6) Hz for rate system give evidence interaction between gelator aggregates. data were interpreted terms two-fraction fast-exchange model. Additionally it also shown that cooling during...