A5035099058- Advanced NMR Techniques and Applications
- NMR spectroscopy and applications
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Nanopore and Nanochannel Transport Studies
- Graphene research and applications
- Crystallography and Radiation Phenomena
- Ionic liquids properties and applications
- Polymer Nanocomposites and Properties
- Electromagnetic Effects on Materials
- Material Dynamics and Properties
- Rare-earth and actinide compounds
- Theoretical and Computational Physics
- Advanced MRI Techniques and Applications
- Tribology and Wear Analysis
- Catalysis and Hydrodesulfurization Studies
- Quantum, superfluid, helium dynamics
- TiO2 Photocatalysis and Solar Cells
- Epoxy Resin Curing Processes
- Photochemistry and Electron Transfer Studies
- Nanomaterials for catalytic reactions
- Polymer composites and self-healing
- Transition Metal Oxide Nanomaterials
- Building materials and conservation
- Advancements in Battery Materials
National Centre of Scientific Research "Demokritos"
2004-2024
Sulfur copolymers with high sulfur content find a broad range of applications from Li–S batteries to catalytic processes, self-healing materials, and the synthesis nanoparticles. Synthesis sulfur-containing polymers via inverse vulcanization technique gained lot attention due feasibility reaction produce (up 90 wt %). However, interplay between cross-linker structure has not yet been fully explored. In present work, effect amount 1,3-diisopropenyl benzene (DIB) on structural stability...
Titanium dioxide (TiO2) is an excellent photocatalytic material that imparts biocidal, self-cleaning and smog-abating functionalities when added to cement-based materials. The presence of TiO2 influences the hydration process cement development its internal structure. In this article, a pore network pastes containing different ratios were studied using two noninvasive techniques (ultrasonic NMR). Ultrasonic results show addition enhances mechanical properties paste during early-age...
Abstract Structural and morphological control of crystalline nanoparticles is crucial in the field heterogeneous catalysis development “reaction specific” catalysts. To achieve this, colloidal chemistry methods are combined with ab initio calculations order to define reaction parameters, which drive chemical reactions desired crystal nucleation growth path. Key this procedure experimental verification predicted facets their corresponding electronic structure, case nanostructured materials...
Water, when confined at the nanoscale acquires extraordinary transport properties, and yet, there is no direct experimental evidence of these properties resolution. Here, by using two-dimensional NMR diffusion–relaxation (D–T2) spin–lattice – spin–spin relaxation (T1–T2) spectroscopy, we succeeded to resolve water diffusion in single- double-walled carbon nanotubes (SWCNTs/DWCNTs). In SWCNTs, spectra display characteristic shape uniform restricted one dimension. Remarkably, DWCNTs, shown...
Highly active nickel phosphide (Ni2P) nanoclusters confined in a mesoporous SiO2 catalyst were synthesized by two-step process targeting tight control over the Ni2P size and phase. The Ni precursor was incorporated into MCM-41 matrix one-pot synthesis, followed phosphorization step, which accomplished oleylamine with trioctylphosphine at 300 °C so to achieve phase transformation from Ni2P. For benchmarking, (absence of phosphorization) 11 nm nanoparticles SiO2) also prepared. From...
Abstract Detecting the metallic Dirac electronic states on surface of Topological Insulators (TIs) is critical for study important quantum properties (SQPs), such as Majorana zero modes, where simultaneous probing bulk and edge electron required. However, there a particular shortage experimental methods, showing at atomic resolution how electrons extend interact with interior nanoscaled TI systems. Herein, by applying advanced broadband solid-state 125 Te nuclear magnetic resonance (NMR)...
It is well known that water inside hydrophobic nano-channels diffuses faster than bulk water. Recent theoretical studies have shown this enhancement depends on the size of nanochannels. However, experimental evidence dependence lacking. Here, by combining two-dimensional nuclear magnetic resonance diffusion–relaxation (D–T2eff) spectroscopy in stray field a superconducting magnet and molecular dynamics simulations, we analyze Carbon Nanotubes (CNTs) different diameters (1.1–6.0 nm),...
Abstract Molecular motion in nanosized channels can be highly complicated. For example, water molecules ultranarrow hydrophobic nanopores move rapidly and coherently a single file, whereas by increasing the pore size they organize into coaxial tubes, displaying stratified diffusion. Interestingly, an analogous complex is predicted viscous charged fluids, such as room temperature ionic liquids (RTILs) confined nanoporous carbon or silica; however, experimental evidence still pending. Here,...
Confined liquids are model systems for the study of metastable supercooled state, especially bulk water, in which onset crystallization below 230 K hinders application experimental techniques. Nevertheless, addition to suppressing crystallization, confinement at nanoscale drastically alters properties water. Evidently, behavior confined water depends critically on nature confining environment and interactions molecules with matrix. A comparative dynamics under hydrophobic hydrophilic could...
The suppression of magnetic order and the detection a half-quantized thermal Hall effect in {\alpha}-RuCl3 under an external field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by Kitaev quantum liquid (QSL) model, or if they arise from more conventional mechanism antiferromagnetically ordered state. Here, through 23Na NMR relaxation measurements on layered cobaltate Na2Co2TeO6 at two distinct fields (4.7 9.4 Tesla), we provide...
<title>Abstract</title> The suppression of magnetic order and the detection a half-quantized thermal Hall effect in α-RuCl<sub>3</sub> under an external field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by Kitaev quantum liquid (QSL) model, or if they arise from more conventional mechanism antiferromagnetically ordered state. Here, through <sup>23</sup>Na NMR relaxation measurements on layered cobaltate...
It is well known that water inside hydrophobic nano-channels diffuses faster than bulk water. Recent theoretical studies have shown this enhancement depends on the size of nanochannels. However, experimental evidence dependence lacking. Here, by combining two-dimensional Nuclear Magnetic Resonance (NMR) diffusion-relaxation D-T2eff spectroscopy in stray field a superconducting magnet, and Molecular Dynamics (MD) simulations, we analyze dynamics carbon nanotubes (CNTs) different diameters...
Structural and morphological control of crystalline nanoparticles is crucial in the field heterogeneous catalysis development “reaction specific” catalysts. To achieve this, colloidal chemistry methods are combined with ab initio calculations order to define reaction parameters, which drive chemical reactions desired crystal nucleation growth path. Key this procedure experimental verification predicted facet its corresponding electronic structure, case nanostructured materials becomes...
Weyl fermions (WFs) in the type-II semimetal (WSM) ${\mathrm{WTe}}_{2}$ are difficult to resolve experimentally because bands disperse an extremely narrow region of ($E\text{\ensuremath{-}}k$) space. Here, by using DFT-assisted high-resolution $^{125}\mathrm{Te}$ solid-state nuclear magnetic resonance (ssNMR) temperature range 50--700 K, we succeeded detecting low energy WF excitations and monitoring their evolution with temperature. Remarkably, WFs observed emerge at $T\ensuremath{\sim}120$...
The molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid [BMIM]+[TCM]- confined in SBA-15 mesoporous silica were examined using 1H NMR spin-lattice (T1) relaxation and diffusion measurements. An extensive temperature range (100 K-400 K) was considered order to study both the glassy states. hydrogen two states self-diffusion coefficients cation [BMIM]+ above glass transition extracted from experimental data. results then compared corresponding bulk substance....
In this work we present a novel approach utilizing nuclear magnetic resonance (NMR) relaxometry to assess the structural stability of microcapsules employed as self-healing agents in advanced aerospace composites both ambient and harsh environmental conditions. We successfully correlate amount encapsulated agent with signal intensity confirm non-destructively quantity mass for first time literature using 1H NMR spin-spin relaxation techniques on urea-formaldehyde (UF) different diameters...
Detection of the metallic Dirac electronic states on surface Topological Insulators (TIs) is a tribune for small number experimental techniques most prominent which Angle Resolved Photoemission Spectroscopy. However, there no method showing at atomic scale resolution how electrons extend inside TI systems. This critical issue in study important quantum properties, especially topological quasiparticle excitations. Herein, by applying advanced DFT-assisted solid-state 125Te Nuclear Magnetic...
Structural and morphological control of crystalline nanoparticles is crucial in the field heterogeneous catalysis development “reaction specific” catalysts. To achieve this, colloidal chemistry methods are combined with ab initio calculations order to define reaction parameters, which drive chemical reactions desired crystal nucleation growth path. Key this procedure experimental verification predicted facet its corresponding electronic structure, case nanostructured materials becomes...
Abstract Molecular motion in nanosized channels can be highly complicated. For example, water molecules hydrophobic nanopores move rapidly and coherently a chain, following the so-called single file motion. Surprisingly, fast molecular is also observed viscous charged fluids, such as room temperature ionic liquids (RTILs) confined nanoporous carbon or silica matrix. The microscopic mechanism of this intriguing effect still unclear. Here, by combining NMR diffusion experiments different...
Weyl Fermions (WFs) in the type-II Semimetal (WSM) WTe$_2$ are difficult to resolve experimentally because bands disperse an extremely narrow region of (E-k) space. Here, by using DFT-assisted high-resolution $^{125}$Te solid-state NMR (ssNMR) temperature range $50$K - $700$K, we succeeded detecting low energy WF excitations and monitor their evolution with temperature. Remarkably, WFs appear emerge at T$\sim 120$K; lower temperatures behaves as a metal. This intriguing metal-to-WSM phase...