A5059478007- Corrosion Behavior and Inhibition
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanoparticles: synthesis and applications
- ZnO doping and properties
- Dental materials and restorations
- Gas Sensing Nanomaterials and Sensors
- Metal and Thin Film Mechanics
- Hydrogen embrittlement and corrosion behaviors in metals
- Additive Manufacturing Materials and Processes
- Material Properties and Applications
- Additive Manufacturing and 3D Printing Technologies
- Extraction and Separation Processes
- High-Temperature Coating Behaviors
- Coagulation and Flocculation Studies
- Advanced ceramic materials synthesis
- Analytical chemistry methods development
- Ion-surface interactions and analysis
- Laser-Ablation Synthesis of Nanoparticles
- Polymer Surface Interaction Studies
- biodegradable polymer synthesis and properties
- Plasmonic and Surface Plasmon Research
- Advanced Photocatalysis Techniques
- Electrodeposition and Electroless Coatings
- Luminescence Properties of Advanced Materials
- Concrete Corrosion and Durability
Sofia University "St. Kliment Ohridski"
2013-2024
Institute of Physical Chemistry
2020
Institute of Metal Science, Equipment and Technologies
2020
Bulgarian Academy of Sciences
2020
Plovdiv University
1986-1988
Kappa carrageenan (KC), a sulfated polysaccharide derived from red seaweed, exhibits distinct gelation properties that are influenced by ionic strength and thermal conditions. While its behavior in aqueous media is well-established, understanding KC’s mechanisms non-aqueous solvents (like glycerol) remains limited. This study investigates the conformational rheological of kappa glycerol, focusing on effects sodium salts (NaCl, NaH2PO4, Na3PO4) at varying concentrations preparation...
This study aimed to present the differences in corrosion properties and protective ability of two bi-layer systems obtained on low-carbon steel a model corrosive medium 5% NaCl solution. These newly developed consist Zn-Co (3 wt.%) or Zn-Ni (10 alloy coatings as under-layers very thin TiO2 sol-gel film top-layer. Scanning electron microscopy (SEM) is used for characterization surface morphology samples indicating that some quantitative appear result different composition both zinc alloys....
Samarium doped (0.5–5 at.%) ZrO2 films with high surface and optical quality were obtained by sol–gel method using inorganic zirconium precursor. The morphology roughness of the samples investigated scanning electron microscopy (SEM) atomic force (AFM). A phase transition following doping Sm3+ ions was registered X-ray diffraction (XRD) method, leading to stabilization tetragonal phase. Optical parameters such as refractive index extinction coefficient determined for each sample....
Dense, highly textured, hydrophobic ZrO2-TiO2 (1:1) coatings with amorphous structure were prepared using the sol-gel method. Both organic and inorganic zirconium precursor salts used. The present study dealt investigation of their protective ability in a selected model corrosive medium chloride ions as corrosion activators. showed good anticorrosion performance during test, which was demonstrated both by weight loss method potentiodynamic polarization curves. samples characterized means...
ABSTRACT In this work, we report on a technique for manufacturing of polymer scaffolds free from contact with toxic solvents. The method is adapted the modified microfibrillar reinforced composites (MFC) concept. objects investigation were biodegradable poly ( l ‐lactide) (PLLA) and biocompatible (ethylene‐vinyl alcohol copolymer) (EVAL). polymers melt blended thereafter cold drawn, so that both components converted in fibrillar state. After selective dissolving EVAL drawn bristles mixture...
The construction of anticorrosion coatings containing antifouling agents is an effective way to ensure the long-term durability marine steel infrastructures. In this work, innovative hybrid coating was prepared by introducing biocide CuO nanoparticles in ordinary zinc improve its protective ability for aggressive salt water environments. were embedded inside matrix chitosan/alginate complexes prevent spontaneous copper leaching during corrosive attacks. Two procedures applied...
This work presents the enhanced corrosion resistance of newly developed two-layer composite coatings deposited on low-carbon steel: electrodeposited zinc alloy (Zn-Ni with 10 wt.% Ni (ZN) or Zn-Co 3 Co (ZC), respectively) and a top ZrO2 sol-gel layer. Surface morphology peculiarities anti-corrosion characteristics were examined using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), atomic force (AFM), water contact angle (WCA) measurements, X-ray diffraction (XRD),...
The dependence of the surface plasmons resonance (SPR) frequency on size gold nanoparticles (GNPs) is experimentally studied. measured data for SPR by UV-Vis spectroscopy and GNPs diameter Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM) Atomic Force (AFM) are collected in course classical citrate synthesis. relationship between blue shift light absorption presented. They fitted an equation with a single free parameter, dielectric permittivity surrounding media. Thus,...
Enhanced corrosion efficiency of low-carbon steel was achieved by newly developed hybrid multilayers, composed coated with an electrodeposited zinc sublayer (1 µm), a chitosan (CS) middle layer and ZrO2 coating the sol–gel method (top-layer). The obtained dipping galvanized substrate in 3% tartatic acid water solution medium molecular-weight chitosan, β-(1–4)-linked D-glucosamine N-acetyl-D-glucosamine deacetylation degree about 75–85% (CS). substrates were dipped into CS withdrawn at rate...
The presented investigations demonstrate the corrosion behavior and protective ability of hybrid zinc coatings specially designed for combined protection low-carbon steel from localized biofouling. Polymer-modified copper oxide (CuO) nanoparticles as widely used classic biocide are applied this purpose, being simultaneously electrodeposited with electrolytic bath. is evaluated in a model corrosive medium 5% NaCl solution artificial sea water (ASW). Scanning electron microscopy (SEM) atomic...
Endodontic irrigants could alter the mechanical properties of root canal dentin, such as its roughness.To compare effect various irrigation protocols on dentin roughness with respect to their application time, concentration, and additional ultrasonic activation.Forty single-rooted, non-endodontically treated upper incisors were decoronated further sectioned longitudinally in a buccolingual direction. The surfaces all eighty samples polished randomly segregated eight equal groups (n = 10):...
In this paper we present the results of atomic force microscopy (AFM), which is applied to characterize surface morphology graphite samples with glassy carbon coatings developed, stored for 28 months under different conditions. One sample was on Earth at room temperature and second one mounted outer side International Space Station.
Titanium dioxide thin coatings are widely used in different fields for the manufacture of various products:electrochromic displays, photocatalytic systems, photosensitized solar cells and many others. At same time, possibilities obtaining protective based on TiO2 interest. The chemical physical characteristics depend a large extent applied technological method temperature values heat treatment used. Coatings prepared by sol gel applying dip coating technique. present study characterizes...
This work aims to enhance the photocatalytic activity of ZnO films for persistent organic pollutants. The photocatalysis method has gained significant interest as a sustainable and environmentally friendly approach safety clean water by eliminating Zinc oxide transition metal is recognized highly effective material photocatalysis. Even so, can be modified increase its action result in more degradation In process, an electron from valence band excited moves higher energy level, conduction...