Daniela Karashanova
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View article: Structural and Morphological Characterization of Gd-Doped Ceria (Ce1−xGdxO2−x/2) Synthesized by an Optimized Hydrothermal Method
Structural and Morphological Characterization of Gd-Doped Ceria (Ce1−xGdxO2−x/2) Synthesized by an Optimized Hydrothermal Method Open
The aim of the presented work is to develop a more energy- and time-saving modification of a well-known hydrothermal synthesis method by reducing the time of the synthesis regime and drying step, as well as the possible removal of the calc…
View article: From Spirulina platensis to Nanomaterials: A Comparative Study of AgNPs Obtained from Two Extracts
From Spirulina platensis to Nanomaterials: A Comparative Study of AgNPs Obtained from Two Extracts Open
This study presents the synthesis and characterization of silver nanoparticles (AgNPs) using two Spirulina platensis extracts: one of them cultivated in a bioreactor in Bulgaria (near Varvara village), and the other one from the local mark…
View article: Co-modified SBA-15 catalysts for waste gases purification processes - Effect of precursor
Co-modified SBA-15 catalysts for waste gases purification processes - Effect of precursor Open
View article: A Comparative Study on Synthesizing SiC via Carbonization of Si (001) and Si (111) Substrates by Chemical Vapor Deposition
A Comparative Study on Synthesizing SiC via Carbonization of Si (001) and Si (111) Substrates by Chemical Vapor Deposition Open
This work presents a comparative analysis of the results of silicon carbide synthesis through the carbonization of Si (001) and Si (111) substrates in the temperature range 1130–1140 °C. The synthesis involved chemical vapor deposition uti…
View article: 3D printed nickel-copper modified CaNaX and NaX zeolites obtained from coal fly ash for sustainable levulinic acid hydrogenation
3D printed nickel-copper modified CaNaX and NaX zeolites obtained from coal fly ash for sustainable levulinic acid hydrogenation Open
View article: The Study of the Synthesis of SiC by the Carbonization of Si(111) Substrates: The Role of Native Silicon Oxide
The Study of the Synthesis of SiC by the Carbonization of Si(111) Substrates: The Role of Native Silicon Oxide Open
We present the results of silicon carbide (SiC) thin film synthesis on Si(111) substrates using chemical vapor deposition by decomposing CH4 in H2 at 1135 °C. The experiments were conducted in an Oxford Nanofab Plasmalab System 100 for car…
View article: Design of 3D printed Mg doped Ni-Co-containing biowaste-derived porous silica as highly-effective catalysts for CO2 methanation
Design of 3D printed Mg doped Ni-Co-containing biowaste-derived porous silica as highly-effective catalysts for CO2 methanation Open
View article: Coking-driven activation of NixFe3-xO4 doped waste-derived carbon: From methanol decomposition to enhanced alkaline OER catalysis
Coking-driven activation of NixFe3-xO4 doped waste-derived carbon: From methanol decomposition to enhanced alkaline OER catalysis Open
16 figures, 5 tables, supplementary information available.-- Under a CC BY-NC-ND 4.0 license.
View article: Influence of Synthesis Conditions on the Capacitance Performance of Hydrothermally Prepared MnO2 for Carbon Xerogel-Based Solid-State Supercapacitors
Influence of Synthesis Conditions on the Capacitance Performance of Hydrothermally Prepared MnO2 for Carbon Xerogel-Based Solid-State Supercapacitors Open
In this study, the potential to modify the phase structure and morphology of manganese dioxide synthesized via the hydrothermal route was explored. A series of samples were prepared at different synthesis temperatures (100, 120, 140, and 1…
View article: 3D Printed Ni–Cu Sodalite Catalysts for Sustainable γ-Valerolactone Production from Levulinic Acid—Effect of the Copper Content and the Method of Preparation
3D Printed Ni–Cu Sodalite Catalysts for Sustainable γ-Valerolactone Production from Levulinic Acid—Effect of the Copper Content and the Method of Preparation Open
Coal fly ash zeolites with Sodalite structure were synthesized by ultrasound-assisted double stage fusion-hydrothermal synthesis. Monometallic Ni and bimetallic Ni–Cu supported catalysts with 5 wt.% Ni and different copper contents of 1.5,…
View article: The Formation of γ-Valerolactone from Renewable Levulinic Acid over Ni-Cu Fly Ash Zeolite Catalysts
The Formation of γ-Valerolactone from Renewable Levulinic Acid over Ni-Cu Fly Ash Zeolite Catalysts Open
Zeolites with different structures (P1, sodalite, and X) were synthesized from coal fly ash by applying ultrasonically assisted hydrothermal and fusion–hydrothermal synthesis. Bimetallic catalysts, containing 5 wt.% Ni and 2.5 wt.% Cu, sup…
View article: Pd-Co Supported on Anodized Aluminium for VOCs Abatement: Reaction Mechanism, Kinetics and Applicability as Monolithic Catalyst
Pd-Co Supported on Anodized Aluminium for VOCs Abatement: Reaction Mechanism, Kinetics and Applicability as Monolithic Catalyst Open
It has been found out that Pd-Co-based catalyst, supported on anodized aluminum, possesses very high activity in combustion reactions of C1–C6 alkanes and toluene. The catalyst characterization has been made by N2-pysisorption, XRD, SEM, X…
View article: Mesoporous Silica with an Alveolar Construction Obtained by Eco-Friendly Treatment of Rice Husks
Mesoporous Silica with an Alveolar Construction Obtained by Eco-Friendly Treatment of Rice Husks Open
The high silicon content in rice plant waste, specifically rice husks, makes this waste by-product attractive for the extraction and valorization of silicon oxide, which is widely used as an inert support in catalysis, drug delivery and mo…
View article: Growth of Monolayer MoS2 Flakes via Close Proximity Re-Evaporation
Growth of Monolayer MoS2 Flakes via Close Proximity Re-Evaporation Open
We report a two-step growth process of MoS2 nanoflakes using a low-pressure chemical vapor deposition technique. In the first step, a MoS2 layer was synthesized on a c-plane sapphire substrate. This layer was subsequently re-evaporated at …
View article: Structure Engineering of Ni/SiO2 Vegetable Oil Hydrogenation Catalyst via CeO2
Structure Engineering of Ni/SiO2 Vegetable Oil Hydrogenation Catalyst via CeO2 Open
Inspired by our finding that metallic Ni particles could be uniformly distributed on a reduced CeO2 surface and stabilized on Ce3+ sites, we suppose a possible improvement in the activity and selectivity of the MgNi/SiO2 vegetable oil hydr…
View article: LASER-ASSISTED SYNTHESIS OF WATER COLLOIDAL METALLIC NANOCOMPOSITES
LASER-ASSISTED SYNTHESIS OF WATER COLLOIDAL METALLIC NANOCOMPOSITES Open
Picosecond and Nanosecond Nd:YAG laser systems with a fundamental wavelength of 1064 nm are utilizedfor green synthesis of bimetallic nanocomposites based on metal combinations of Pt/Ti, Pd/Ti, Pt/Zn and Pd/Zn. The laser assisted method is…
View article: PdSe2 single crystals synthesized by the self-flux method
PdSe2 single crystals synthesized by the self-flux method Open
Palladium diselenide (PdSe2) is an important transition metal dichalcogenide with a layers-dependent bandgap and many potential applications in electronic and optoelectronic devices. However, the availability of high-quality large-area cry…
View article: Advanced properties of gold nanoparticles obtained by using long-chain secondary amine for phase transfer from water to chloroform
Advanced properties of gold nanoparticles obtained by using long-chain secondary amine for phase transfer from water to chloroform Open
We have conducted a new comparison of gold nanoparticles functionalized by primary- and secondary amine with the same chain length. Our hypothesis suggests that the adaptive steric conformation of the secondary amine molecular branches mak…
View article: Correction: Popova et al. Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone. Molecules 2024, 29, 99
Correction: Popova et al. Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone. Molecules 2024, 29, 99 Open
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View article: FTIR spectroscopy revealed nonplanar conformers, chain order, and packaging density in diOctadecylamine- and octadecylamine-passivated gold nanoparticles
FTIR spectroscopy revealed nonplanar conformers, chain order, and packaging density in diOctadecylamine- and octadecylamine-passivated gold nanoparticles Open
This work reveals that diOctadecylamine (diODA) outperforms its primary amine counterpart ODA in intra- and intermolecular order, forming passivation monolayers on 5 nm small gold nanoparticles. We support this conclusion by meticulously a…
View article: Fabrication of Nanostructures Consisting of Composite Nanoparticles by Open-Air PLD
Fabrication of Nanostructures Consisting of Composite Nanoparticles by Open-Air PLD Open
We present a two-step physical method for the fabrication of composite nanoparticle-based nanostructures. The proposed method is based on the pulsed laser deposition (PLD) technique performed sequentially in vacuum and in air. As a first s…
View article: Synthesis of 2D PtSe<sub>2</sub> Nanolayers on Glass Substrates and Their Integration in Near-Infrared Light Shutters
Synthesis of 2D PtSe<sub>2</sub> Nanolayers on Glass Substrates and Their Integration in Near-Infrared Light Shutters Open
PtSe2 has asserted its key role among the emerging 2D transition metal dichalcogenides, however, its simplified growth process with controlled number of layers, high crystalline quality, and on inexpensive substrates is still ch…
View article: Application of Aluminium Nanostructures for 355 nm Surface-enhanced Raman Spectroscopy of Coconut Milk
Application of Aluminium Nanostructures for 355 nm Surface-enhanced Raman Spectroscopy of Coconut Milk Open
Less than two decades ago aluminium plasmonics emerged and attracted great interest. Aluminium nanoparticles were produced on fused silica substrates by the direct picosecond laser deposition technique. The as prepared active substrates we…
View article: Nanocrystalline (Cu0.5Ni0.5)yFe3−yO4 Ferrites: Synthesis and Characterization
Nanocrystalline (Cu0.5Ni0.5)yFe3−yO4 Ferrites: Synthesis and Characterization Open
Nanocrystalline materials with the composition of (Cu0.5Ni0.5)yFe3−yO4 and a spinel structure were synthesized by the auto-combustion sol–gel method. The materials were characterized by powder X-ray diffraction, Mössbauer spectroscopy, tra…
View article: Growth of 2D MoS<sub>2</sub> on sapphire and mica
Growth of 2D MoS<sub>2</sub> on sapphire and mica Open
In this work, we present a study on the epitaxial growth of MoS 2 on both sapphire and mica substrates using the Chemical Vapor Deposition (CVD) method. The research focuses on optimizing the growth conditions in order to achieve reproduci…
View article: Magnetite Crystallization in a Sodium-Calcium-Silicate Glass with High Iron Oxide Concentration – Effect on the Magnetic Properties
Magnetite Crystallization in a Sodium-Calcium-Silicate Glass with High Iron Oxide Concentration – Effect on the Magnetic Properties Open
View article: Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone
Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone Open
Monometallic (Ni, Co, Cu) and bimetallic (Ni-Co, Ni-Cu) 10–20 wt.% metal containing catalysts supported on fly ash zeolite were prepared by post-synthesis impregnation method. The catalysts were characterized by X-ray powder diffraction, N…
View article: Dielectric spectroscopy characterization of Na+ ion-conducting polymer nanocomposite system PEO–PVP–NaIO<sub>4</sub>–TiO<sub>2</sub>
Dielectric spectroscopy characterization of Na+ ion-conducting polymer nanocomposite system PEO–PVP–NaIO<sub>4</sub>–TiO<sub>2</sub> Open
We studied the effect of titanium dioxide (TiO 2 ) nanoparticles (NPs) on dielectric behavior of Na[Formula: see text] ion-conducting salt-complexed polymer nanocomposite system formed from a binary polymer blend of poly(ethylene oxide) (P…
View article: Chlorhexidine–Silver Nanoparticle Conjugation Leading to Antimicrobial Synergism but Enhanced Cytotoxicity
Chlorhexidine–Silver Nanoparticle Conjugation Leading to Antimicrobial Synergism but Enhanced Cytotoxicity Open
This study explored the potential synergism within chlorhexidine–silver nanoparticle conjugates against Influenza type A, Staphylococcus aureus, Escherichia coli, and Candida albicans. Silver nanoparticles (SN) were obtained by the reducti…
View article: Impact of Ce/Zr Ratio in the Nanostructured Ceria and Zirconia Composites on the Selective CO2 Adsorption
Impact of Ce/Zr Ratio in the Nanostructured Ceria and Zirconia Composites on the Selective CO2 Adsorption Open
High surface-area, mesoporous CeO2, ZrO2, and Ce-Zr composite nanoparticles were developed using the hydrothermal template-assisted synthesis method. Samples were characterized using XRD, N2 physisorption, TEM, XPS, and FT-IR spectroscopic…