A5065961186- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electron Spin Resonance Studies
- Metal complexes synthesis and properties
- Protein Interaction Studies and Fluorescence Analysis
- Surfactants and Colloidal Systems
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Lanthanide and Transition Metal Complexes
- Photochemistry and Electron Transfer Studies
- Supramolecular Chemistry and Complexes
- Hydrogels: synthesis, properties, applications
- Supramolecular Self-Assembly in Materials
- Molecular Sensors and Ion Detection
- Free Radicals and Antioxidants
- Synthesis and Characterization of Heterocyclic Compounds
- Ocular Surface and Contact Lens
- Drug Solubulity and Delivery Systems
- Catalytic Processes in Materials Science
- Corneal surgery and disorders
- Collagen: Extraction and Characterization
- Gold and Silver Nanoparticles Synthesis and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Photoreceptor and optogenetics research
- Spectroscopy and Quantum Chemical Studies
Romanian Academy
2015-2024
National Research & Development Institute for Textiles and Leather
2023
Academy of Romanian Scientists
2003-2022
University of Bucharest
2002-2021
Laboratoire de Chimie
2021
Gheorghe Asachi Technical University of Iași
2018
Institute of Physical Chemistry
2015
Texas A&M University at Galveston
2010
University of York
2005-2009
Weizmann Institute of Science
2009
Nanocrystalline CeO2 powders were synthesized by two cost-effective methods: the self-propagating room temperature (SPRT) method and precipitation method. Differently prepared samples exhibited different temperature-dependent photoluminescence (PL) in ultraviolet visible regions. The PL signals originated from kinds of oxygen-deficient defect centres with or without trapped electrons (F0, F+ F++ centres). spectra measured using excitation lines, below (457, 488 514 nm) comparable (325 to...
Keratoconus is a progressive corneal ectasia that may lead to severe visual impairment due the irregular astigmatism caused by thinning. In addition its association with atopy, eye rubbing, or genetic component, late reports suggest involvement of inflammation in pathogenesis disease. Our aim was determine concentration IL-4, IL-6, IL-10, RANTES, IFN gamma, and TNF alpha tear film patients keratoconus their first degree family members. We analyzed forty-eight participants an observational...
The formation and growth of gold nanoparticles (AuNPs) were investigated in pH 7 buffer solution bovine serum albumin (BSA) at room temperature. processes monitored by UV-Vis, circular dichroism, Raman electron paramagnetic resonance (EPR) spectroscopies. TEM microscopy dynamic light scattering (DLS) measurements used to evidence changes particle size during nanoparticle growth. AuNPs the absence BSA was not observed, which proves that is involved first step Au(III) reduction. Changes EPR...
Gelatin nanofibers are known as wound-healing biomaterials due to their high biocompatible, biodegradable, and non-antigenic properties compared synthetic-polymer-fabricated nanofibers. The influence of gamma radiation doses on the structure gelatin nanofiber dressings origin is little known, although it very important for production stable bioactive products. Different-origin gelatins were extracted from bovine donkey hides, rabbit skins, fish scales used fabrication through electrospinning...
The interactions of bovine serum albumin (BSA) with ionic surfactants (sodium dodecyl sulfate, SDS, and cetyltrimethylammonium bromide, CTAB) β-cyclodextrin (β-CD) have been investigated by electron paramagnetic resonance (EPR) circular dichroism measurements. spin probe selected to report on the interaction and/or β-CD was 4-N,N-dimethyl hexadecyl ammonium-2,2,6,6-tetramethylpiperidine-1-oxyl iodide (CAT16), account (a) its balance between electrostatic hydrophobic character (b) ability BSA...
In this study, the effect of gamma irradiation (10 kGy) on proteins extracted from animal hide, scales, and wool was evidenced by calorimetric (μDSC) spectroscopic (IR, circular dichroism, EPR) methods. Keratin obtained sheep wool, collagen bovine gelatin fish scales. The μDSC experiments that influences thermal stability these differently. keratin decreases, while a resistance to denaturation noticed for gelatins after irradiation. analysis IR spectra demonstrated determines changes in...
Cation and polyanion exchange in alginate gels were monitored by spin labelling EPR spectroscopy.
The interaction of human serum albumin (HSA) with amphiphilic block copolymer Pluronic F127 has been investigated by several physical methods. Interest in studying this system stems from a broad range bioactivities involving both macromolecules. Serum albumins constitute significant class proteins the circulatory system, acting as carriers for wide spectrum compounds or assemblies. copolymers have revealed their capacity to ferry variety biologically active compounds. Circular dichroism,...
This study analyzes the physico-chemical properties of interpenetrated polymer networks (IPNs) and semi-IPN resulting from cross-linking chitosan with glutaraldehyde alginate Ca2+ cations, as a function order in which agents are added to mixture. Three methods were used assess differences between systems: rheology, IR spectroscopy, electron paramagnetic resonance (EPR) spectroscopy. While rheology spectroscopy commonly characterize gel materials, EPR is rarely used, but has advantage...
EPR spectroscopy was used to study formation of inclusion complexes monofunctionalised spin-labelled β-cyclodextrins; this method is very sensitive the interactions cyclodextrins with large guest molecules.
Inorganic nanoparticles can be embedded within gels by selectively preloading them with suitable molecular precursors followed reduction or another reaction. Here, we exploit the selective sorption properties of cross-linked β-cyclodextrin/poly(ethylene glycol) hydrogels, in analogy polyurethane foams, to preconcentrate metal salts (HAuCl4 and K2[Co(SCN)4]) subsequently generate gel-embedded (10-50 nm). The are shown immobilized gel network as a consequence their large dimensions comparison...
The properties of newly synthesized Cu2O/CuO-decorated TiO2/graphene oxide (GO) nanocomposites (NC) were analyzed aiming to obtain insight into their photocatalytic behavior and various applications, including water remediation, self-cleaning surfaces, antibacterial materials, electrochemical sensors. physico-chemical methods research photoluminescence (PL), electron paramagnetic resonance (EPR) spectroscopy, cyclic voltammetry (CV), differential pulse (DPV). solid samples evidenced an EPR...
Abstract Inspired by natural photosynthesis, a new green catalyst with better photocatalytic properties was obtained. Nanostructured TiO 2 , cheap cost Chlorophyll‐a as an electron promotor and mussel‐inspired polydopamine (PD) bio adhesive were synergistically combined in the double S‐scheme hybrid photocatalysts The role of PD bridging molecule between pigments Chl clearly demonstrated improved charge transfer recombination rate. Methylorange probe used to test stability efficiency...
EPR spectra of cyclodextrins labelled with TEMPO derivatives (SL-CDs) are sensitive to complexation large guest molecules. We used SL-CDs explore the behaviour concentrated PEG/PPG solutions. The relationship between rotational correlation times and solvent viscosity showed significant deviations from Debye–Stokes–Einstein equation, probably due self-aggregation alkylene glycols in data fit fractional equation well. have also studied adamantane-functionalised DAB dendrimers. strength binding...
Formation of inclusion complexes between several cyclodextrin derivatives and TEMPO DOXYL-based spin probes was studied by EPR spectroscopy. Competition alkyl chains nitroxide functionalities for cavities leads to different types complexation. Long in amphiphilic interact preferentially with cyclodextrins, units such molecules are unaffected DOXYL-type however form stronger cyclodextrins; this complexation changes hyperfine splitting tumbling rate the group. Comparison spectra free...
Complexation of β-cyclodextrin with flexible nitroxide biradicals linked by a polyethylene glycol chain was monitored EPR spectroscopy. The spectra the uncomplexed show an exchange interaction due to flexibility chain. cyclodextrin leads disappearance in spectra. complexation can be reversed addition competing guests (e.g., adamantane derivatives). At high concentration, inclusion complexes precipitate, and differential scanning calorimetry (DSC) precipitates proved formation complexes....
Formation of organogels from covalently linked polyethylene glycols and cyclodextrins their encapsulation/release properties were monitored with EPR spectroscopy using spin labels probes; changes in molecular tumbling rates provided information on probe/label location inside the gel network, gel.
The properties of a gel consisting covalent network formed by the reaction isocyanate end-capped polyethylene glycol (PEG) with β-cyclodextrin, were investigated EPR spectroscopy. Spin-labelled cyclodextrin was incorporated into cross-link points and at chain ends. dynamics fibres as reported spin label, found to be sensitive H-bonding ability solvent, density cross-links temperature. Addition probes (e.g., TEMPO adamantane-TEMPO) unlabelled made it possible characterise solvent pools in...
Electron spin-echo envelope modulation (ESEEM) spectroscopy was used to investigate intramolecular and intermolecular complexes of cyclodextrins (CDs) with a nitroxide group. The interaction solvent molecules (D(2)O) followed through the (2)H depth. Competition experiments adamantane-type guests were confirm complexation. shielding group from upon inclusion into CD cavity made this technique more sensitive complexation than cw EPR spectroscopy. ESEEM analysis series CDs mono bis spin-labeled...