A5027903468- Nanoparticles: synthesis and applications
- TiO2 Photocatalysis and Solar Cells
- Polymer Nanocomposite Synthesis and Irradiation
- Graphene and Nanomaterials Applications
- Bone Tissue Engineering Materials
- Mesoporous Materials and Catalysis
- Advanced Photocatalysis Techniques
- Advanced Cellulose Research Studies
- Surfactants and Colloidal Systems
- Nanocomposite Films for Food Packaging
- Silicone and Siloxane Chemistry
- Antimicrobial agents and applications
- Polysaccharides and Plant Cell Walls
- Bioeconomy and Sustainability Development
- Nanoparticle-Based Drug Delivery
- Nanomaterials for catalytic reactions
- Analytical Chemistry and Sensors
- Lipid Membrane Structure and Behavior
- Lubricants and Their Additives
- Polysaccharides Composition and Applications
- Pigment Synthesis and Properties
- Concrete and Cement Materials Research
- Advanced Nanomaterials in Catalysis
- Pickering emulsions and particle stabilization
- Botany and Plant Ecology Studies
University of Chemical Technology and Metallurgy
2012-2024
Sofia University "St. Kliment Ohridski"
1987-2019
Abstract Methylcellulose (MC) / SiO2 organic inorganic hybrid materials have been prepared from MC and methyltriethoxysilane or ethyltrimethoxysilane, characterized by XRD, FTIR AFM. XRD showed peak shifts. shows intermolecular hydrogen bonding between SiO2. AFM depicts surface roughness which depends on the silica precursor content.
Antibacterial SiO2 hybrid materials based on tetraethyl orthosilicate (TEOS), hydroxypropylmethylcellulose (HPMC) and silver were prepared by the sol-gel method. The content of cellulose derivate was 5 wt% concentration varied from 0.5 to 2.5 wt%. amorphous nature, morphology antibacterial behaviour studied. Fourier transform infrared (FTIR) spectra hybrids showed characteristic peaks for network. Scanning electron microscope (SEM) analysis confirmed formation spherically shaped...
Hybrid materials based on tetraethyl orthosilicate (TEOS), hydroxypropyl cellulose (HPC), or methyl (HPMC) with silver nanoparticles were synthesized. They analyzed and characterized using differential thermal analysis thermogravimetry, atomic force microscopy, static contact angle measurements. It was experimentally demonstrated that the silver-doped hybrid have pronounced antibacterial behavior by studying reduction of Pseudomonas aeruginosa PAO1 biofilm formation tested materials. The...
This study presents an investigation of antifungal properties hybrid materials based on silica, hydroxypropyl cellulose and ZnSO4.7H2O. The were synthesized by sol-gel technique as a source silica was used tetraethylortho silicate (TEOS). quantity organic substance 5 wt. % the zinc concentration varied from 0,5 to %. strain that for determination potential activity Candida albicans 74. first experiment focused counting survived cells after contact fungi with different concentrations. results...
In the present study, copper modified fibreboards were prepared and their existing phase, morphology, antibacterial behaviour investigated. The content physical mechanical properties of (thickness, bending strength, swelling) determined. X-ray diffraction analysis (XRD) showing peaks typical for cellulose, Cu2S, Na2SO4, depended on preparation conditions. average size Cu2S crystals varied between 20 50 nm. morphology obtained fibreboards, as well shape particles, observed by scanning...
According to the European Agency for Safety and Health at Work (EU - OSHA) Roadmap on Carcinogens about 120,000 work related cancer cases occur each year as a result exposure carcinogens workplace in EU, leading approximately 80,000 fatalities annually. Occupational risk assessment is used criterion occupational safety.At cement manufacturing sector, it was revealed that main hazard carcinogen substances such respirable crystalline SiO2. In present work, two methods were production...
In the present paper cytotoxicity of series sol-gel based copper doped SiO 2 /HPC composites on lung cancer cell line (A549) and primary human umbilical cord endothelial cells (HUVEC) was investigated.Hydroxypropyl cellulose (HPC), tetraethyl ortosilicate (TEOS) were used for preparation amorphous matrix in which added as Cu(NO 3 ) *3H O or CuSO 4 *5H concentration range 0 -5 wt.%.We observed that composite materials at low Cu (0.5 wt.%) showed no toxic effects both types.The material with...