A5017469292- Magnetic Properties and Synthesis of Ferrites
- Multiferroics and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Electromagnetic wave absorption materials
- Iron oxide chemistry and applications
- Liquid Crystal Research Advancements
- Luminescence Properties of Advanced Materials
- Aluminum Alloys Composites Properties
- Electrophoretic Deposition in Materials Science
- Copper-based nanomaterials and applications
- Surfactants and Colloidal Systems
- Inorganic Fluorides and Related Compounds
- ZnO doping and properties
- Quantum Dots Synthesis And Properties
- Photonic Crystals and Applications
- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Advancements in Battery Materials
- X-ray Diffraction in Crystallography
- Magnetic Properties and Applications
- Nanoparticle-Based Drug Delivery
- Electrical and Thermal Properties of Materials
- Lanthanide and Transition Metal Complexes
Jožef Stefan Institute
2015-2024
Jožef Stefan International Postgraduate School
2018-2021
University of Pennsylvania
1999
University of Ljubljana
1997
This review presents experimental realization and behaviour of the ferromagnetic nematic phase, which is observed in different suspensions magnetic nanoplatelets. After a general introduction, challenges synthesis nanoplatelets preparation are discussed. A brief explanation simple macroscopic theory, can be used to understand main features follows. In part, four systems presented: (i) platelets liquid crystals, (ii) dense an isotropic solvent – ferrofluids, (iii) biaxial suspensions, (iv)...
Abstract Ferrofluids are familiar as colloidal suspensions of ferromagnetic nanoparticles in aqueous or organic solvents. The dispersed particles randomly oriented but their moments become aligned if a magnetic field is applied, producing variety exotic and useful magnetomechanical effects. A longstanding interest challenge has been to make such macroscopically ferromagnetic, that having uniform alignment the absence field. Here we report fluid suspension nanoplates spontaneously aligns into...
Schematics of converse magnetoelectric, transverse and parallel magneto-optic effects in a ferromagnetic liquid crystal.
The hydrothermal treatment of an appropriate suspension Ba and Fe hydroxides in the presence a large excess OH− results formation hexaferrite at temperatures as low 150 °C. This temperature enables synthesis uniform, ultrafine nanoparticles. These nanoparticles have disc-like shape, approximately 10 nm wide, but only 3 thick. When is increased, platelet crystals appear consequence secondary re-crystallization (Ostwald ripening). In this work, undesired process has been evaluated. We show...
The dissolution of upconverting AYF4:Yb,Tm (A = Na or K) nanoparticles (UCNPs) in aqueous media was systematically studied. UCNPs with a cubic structure and sizes between 10 33 nm were synthesized solvothermally ethylene glycol at 200 °C. both compositions showed an upconversion fluorescence emission characteristic Tm(3+). effects the A cation, particle size, temperature, pH, composition medium on evaluated. degree determined from fraction dissolved fluoride (F(-)) using potentiometry....
In a proof-of-concept study, we assessed different analytical and spectroscopic parameters for stability screening of differently sized β-NaYF4:20 mol % Yb3+, 2 Tm3+ upconversion nanoparticles (UCNPs) exemplarily in the bioanalytically relevant buffer phosphate buffered saline (PBS; pH 7.4) at 37 50 °C. This included potentiometric determination amount released fluoride ions, surface analysis with X-ray photoelectron spectroscopy (XPS), steady-state time-resolved fluorescence measurements....
Barium hexaferrite BaFe 12 O 19 nanoparticles with a single‐domain size were synthesized using controlled hydrothermal process involving the LaMer–Dinger principle and Ostwald ripening mechanism. Nanocrystalline particles of obtained when molar ratio precursor composition Ba(OH) 2 ·8H O/γ‐Fe 3 was 0.3 concentration suspension about 1 wt%. The as‐synthesized crystalline platelets approximately 50 nm in length 5 thickness exhibited saturation magnetization 40 Am /kg.
Barium ferrite nanoplates with the nominal composition BaFe12–xMxO19, where M = Sc, In, or Cr and x 0–0.5, were hydrothermally synthesized at 160 240 °C. The incorporation of substituent ions into barium particles was confirmed energy-dispersive X-ray spectroscopy. effects temperature, ion, degree substitution on final particle size its distribution studied transmission electron microscopy. magnetic properties affected much more significantly by than their chemical composition.
We report the photoelectrochemical (PEC) performance of textured porous ZnO and CdX-coated films (X = S, Se). Porous were grown with a platelike morphology on F-doped SnO(2) (FTO) substrates. The growth involves two-step procedure. In first step, we electrochemically grew simonkolleite (Zn(5)(OH)(8)Cl(2)·H(2)O) plate films. Annealing at 450 °C results in as-obtained electrodes then used PEC studies. To increase light-harvesting efficiency, sensitized these CdS CdSe quantum dots, using...
The partial dissolution of selected nanoparticles (NaYF<sub>4</sub>, LaF<sub>3</sub> and GdF<sub>3</sub>) co-doped with Yb<sup>3+</sup> Tm<sup>3+</sup> was detected compared respect to their size, chemical composition structure.
Diverse structures are demonstrated in a unique liquid crystal helimagnet under magnetic and electric fields.
We report on experimental studies of the viscoelastic, magnetodielectric, and magnetoviscosity properties ferromagnetic liquid crystals (LCs) prepared by dispersing nanoparticles in a thermotropic LC. Both splay elastic constant rotational viscosity ferronematic LCs are found to be considerably lower than that pure LC advantageous device applications. The show unique magnetodielectric response at very low magnetic fields useful for smart fluid
Dissolution of upconverting nanoparticles (β-NaYF<sub>4</sub>:Yb<sup>3+</sup>,Tm<sup>3+</sup>) in PBS was efficiently suppressed by a polymer coating, PMAO cross-linked with BHMT.
We report magnetic field tuning of the structure and Whispering Gallery Mode lasing from ferromagnetic nematic liquid crystal micro-droplets. Microlasers were prepared by dispersing a crystal, containing nanoparticles fluorescent dye, in glycerol-lecithin matrix. The droplets exhibit radial director structure, which shows elastic distortion at very low external field. dye doped show lasing, is tunable WGM modes linear with wavelength-shift order 1 nm/100 mT. Depending on geometry, WGMs are...
We investigate dynamic magneto-optic effects in a ferromagnetic nematic liquid crystal experimentally and theoretically. Experimentally we measure the magnetization phase difference of transmitted light when an external magnetic field is applied. As model study coupled dynamics magnetization, M, director field, n, associated with crystalline orientational order. demonstrate that studied macroscopic behavior reveals importance cross-coupling between M n. The experimental data are used to...
The incorporation of magnetic barium hexaferrite nanoparticles in a transparent polymer matrix poly(methyl methacrylate) (PMMA) is reported for the first time. nanoplatelets doped with Sc(3+), i.e., BaSc0.5Fe11.5O12 (BaHF), having diameters range 20 to 130 nm and thicknesses approximately 5 nm, are synthesized hydrothermally stabilized 1-butanol dodecylbenzenesulfonic acid. This method enables preparation monolithic nanocomposites by admixing BaHF suspension into liquid monomer, followed...
Hydrodynamics of complex fluids with multiple order parameters is governed by a set dynamic equations many material constants, which only some are easily measurable. We present unique example magneto-optic coupling in ferromagnetic nematic liquid, long-range orientational liquid crystalline molecules accompanied magnetic nanoplatelets. investigate the dynamics response experimentally and theoretically find out that it significantly affected dissipative cross-coupling between parameters. The...
The thickness of Ba-hexaferrite nanoplatelets increases by adding SR segments to a primary SRS stack (S – cubic (Fe<sub>6</sub>O<sub>8</sub>)<sup>2+</sup>block, R hexagonal (BaFe<sub>6</sub>O<sub>11</sub>)<sup>2−</sup>block).