Anita Grozdanov

Ss. Cyril and Methodius University in Skopje · Faculty of Technology and Metallurgy

The processes of generation, management, treatment and disposal of fly ash industrial waste particles, all over the world, were considered as serious issues of solid waste. The subject of this research work was to create and to characterize the Fly ash/Chitosan composites aimed for heavy metal adsorption in polluted waters. Three different types of...

The subject of this research work was to analyze the structural and morphological changes of TiO2 as a result of incorporation of CNTs and interpret the underlying principles for the observed interactions. Hybrid TiO2/CNTs nanostructures were prepared by simplified solgel method followed by monitoring the thermally-induced alterations occurring up...

The aim of this paper is studying the use of industrial, solid waste materials from the ferronickel industry (fly ash—FA, elec-tric furnace slag—EFS and converter slag—CS) as a reinforcing component in new value-added polymer-based composite: eco-friendly, functional geo-membranes. The studied geo-membranes were produced by film-casting method usin...

The literature review of the developments of nanomaterials, application methods, their anti�viral activity confirmed the importance and highlighted the contribution of nanostructures in fighting the corona virus. In order to improve and enhanced the protection function of the facemasks against different viruses, especially last one SARS-CoV-2 (Co...

The subject of research was to monitor and evaluatethe changes in the structure and properties of nanoscaled TiO2 exposed to the X-ray and e-beam irradiation. The studied nanoscaled TiO2 was synthesized using sol-gel method and subsequently exposed to thermal treatment to obtain anatase crystalline structure. Powder diffraction (XRPD) and Raman spe...

This paper reported the results of application of screen printed electrodes (SPE) based on polymer/carbon nanostructures (multi wall carbon nanotubes – MWCNT and grapheme – G) for gas sensors. Commercial SPEs were modified by polymers such as conductive polymer Poly Vinylidene Fluorid – PVDF and biocompatible Poly Ethylene Glycol – PEG. Modified SP...

The subject of this research is in situ study of the process of polyaniline (PANI) electro-polymerization in the presence of graphene. The Graphene was firstly purified/chemically modified, and then SEM/EDS analysis was performed in order to characterize the material. These results have shown that purification and chemical modification of the graph...

Ionizing irradiation passing through materials interacts with their building units inducing changes in the structure. This causes modification of their properties and alteration of their performance. Generally, the ionizing irradiation used for material modification can be part of the electromagnetic spectrum (X-ray or γ-ray irradiation) or can hav...

The aim of this study is to analyze the sensor activity of polyaniline (PANI) based nanocomposites reinforced with carbon nanostructures (CNSs) such as graphene (G) and multi walled carbon nanotubes (MWCNT), in order to use them as pH sensors. For their realization the nanocomposites are applied on screen printed electrode (SPE) by means of steady...

The subject of this research was to monitor and evaluate the effect of X-rays and e-beam irradiation on the structure of nanoscaled TiO 2 and its properties. The samples of nanoscaled TiO 2 were synthesized using the sol-gel method and subsequently exposed to thermal treatment to obtain the anatase crystalline structure. X-ray powder diffraction (X...

COMMON SENSE is a new project that supports the implementation of European Union marine policies such as the Marine Strategy Framework Directive (MSFD) and the Common Fisheries Policy (CFP). The project, which was launched in November 2013, is funded by the EC Seventh Framework Programme (FP7) and has been designed to directly respond to requests f...

Abstract One of the new and promising applications of carbon nanostructures (CNs) are various dosimetry devices. Namely, these devices based on carbon nanostructures can provide the possibility for device miniaturization, lower costs and high scale manufacturing. So, very important factors for the device processing need a quantitative study of the...

This paper describes the development of a simple method for mixed non‐covalent and covalent bonding of partially purified inulinase on functionalized multiwall carbon nanotubes (f‐MWCNTs) with polypyrrole (PPy). The pyrrole was polymerized on MWCNTs electrochemically in order to fabricate MWCNTs/PPy nanocomposite. Two multiple forms of enzyme were...

Bio and chemical monitoring of gases in the air and also of process gases is a great concern in relation to environmental pollution, industrial emission and process monitoring. Sensors are used daily in numerous areas of gas monitoring and design of novel-nano sensors based on carbon nanostructures (G, CNTs) is facilitating a new research direction...

All-cellulose cotton composites were successfully prepared from cotton textile woven pre-forms using a fiber surface dissolution method in lithium chloride dissolved in N,N-dimethylacetamide (LiCl/DMAc). Two different fiber surface pretreatments were used: (i) alkaline scouring with bleaching and (ii) enzymatic scouring with acid and alkaline pecti...

Evaluating the effect of different mechanical and/or chemical surface treatments over the micro-morphological structure of 6 different CAD-CAM blocks.

Evaluating the influence of different surface treatments on the micro-tensile bond strength (µTBS) of two dual-cure composite cements to CAD/CAM blocks.

Abstract All-ceramic fixed restorations, because of their excellent aesthetic characteristics, are made more and more often. On the other hand, the discontinuity of the dental arches in the posterior regions could be solved by the restorations/bridges made out of the stabilized zirconium dioxide because of its great strength. This article reviews t...

Nanocomposites of polyaniline (PANI) and two carbon nanostructures-multiwall carbon nanotubes (MWCNTs) and graphene G) were obtained by electrochemical polymerization. PANI based nanocomposites with different concentration of carbon nanostructures (CNS:1, 2 and 3wt%) as well as with different methods for CNS dispersion in the electrolyte, were synt...

The subject of this study is ultrasound leaching process of nickel-bearing laterite ore from Ržanovo, R. Macedonia. The studied ore was characterized by means of X-ray fluorescence method (XRF), X-ray diffraction method (XRD), thermal analysis (TGA, DTA, DTG) and optical microscopy. The influence of sulfuric acid concentration (1, 2 and 3 M H2SO4)...

BACKGROUND: Hydrofluoric acid is a commonly used chemical in many industrial branches, but it can also be found as an ingredient in household products such as cleaning agents. Possessing high corrosive potential, HF acid causes burns and tissue necrosis, while when absorbed and distributed through the bloodstream, its extremely high toxic potential...

BACKGROUND: The high esthetic expectations from the prosthodontic restorations have directed the qualitative development of the materials towards the all-ceramic materials that are capable of replacing porcelain-fused-to-metal systems. AIM: This article reviews the literature covering the contemporary all-ceramic materials and systems with a focus...

This study is concerned with electrochemical testing of nano-scaled electrocatalysts consisted of Magneli phases as a support and different metallic phases (Co, Pt, Ru, CoPt (Co:Pt = 1:1 wt.), CoRu (Co:Ru = 1:1 wt.) and CoPtRu (Co:Pt:Ru = 1:0,5:0,5 wt.)). Electrocatalytic materials were prepared by sol-gel procedure using organometallic precursors...

The subject of this study is preparation and physical characterization of nano-scaled electrocatalysts for water electrolysis, consisted of Magneli phases as a support and different metallic phases (Co, Pt, Ru, CoPt (Co:Pt = 1:1 wt.), CoRu (Co:Ru = 1:1 wt.) and CoPtRu (Co:Pt:Ru = 1:0,5:0,5 wt.)). Magneli phases were mechanically treated (top-down a...

AIM: The purpose of this review is to represent acids that can be used as surface etchant before adhesive luting of ceramic restorations, placement of orthodontic brackets or repair of chipped porcelain restorations. Chemical reactions, application protocol, and etching effect are presented as well. STUDY SELECTION: Available scientific articles p...

Wastewater that contains heavy metal ions is considered as the serious threat for environmental pollution. Most of the heavy metals are toxic and their ions are not biodegradable with the tendency to accumulate in the soil and in the living organisms, and hence they are significant environmental pollutants. Therefore, the treatment of the heavy met...

This study is concerned with the electrochemical synthesis of polyaniline (PANI) based composites reinforced by carbon nanostructures (CNSs) such as graphene. To determine the optimal conditions for electropolymerization of the aniline to PANI, an electrochemical characterization was performed by means of cyclic voltammetry, steady state polarizati...

This study is concerned with electrochemical testing of nano-scaled electrocatalysts consisted of Magneli phases as a support and different metallic phases (Co, Pt, Ru, CoPt (Co:Pt = 1:1 wt.), CoRu (Co:Ru = 1:1 wt.) and CoPtRu (Co:Pt:Ru = 1:0,5:0,5 wt.)). Electrocatalytic materials were prepared by sol-gel procedure using organometallic precursors...

Last ten years, different methods of graphene production have been developed and reported. The main subject of this work is electrochemical synthesis of graphene using reverse change of the potential. during electrolysis performed in acid electrolyte. As electrodes and precursors for graphene production, two types of graphite were used. Also, three...

The toxicity and non-biodegradation of heavy metals, as well as their tendency to accumulate in the soils, water resources and the living organisms, makes them the significant environmental pollutants. Therefore, the reduction and elimination of heavy metal ions from aqueous systems is very important from the ecological, nutritional and environment...

This study presents the results of the design and characterization of a gas sensor with PMMA/CNTs chemiresistor as sensing element for detection of organic vapors. Multi wall carbon nanotubes (MWCNTs) produced at our lab (by method of pyrolysis, outer diameter d = 10 ÷ 40 nm, purity ≈ 94%) were incorporated into biocompatible polymer matrix. Poly(m...

This article presents a novel formulation for preparation of Lactobacillus casei 01 encapsulated in soy protein isolate and alginate microparticles using spray drying method. A response surface methodology was used to optimise the formulation and the central composite face-centered design was applied to study the effects of critical material attrib...

EXECUTIVE SUMMARY The COMMON SENSE project has been designed and planned in order to meet the general and specific scientific and technical objectives mentioned in its Description of Work (page 77). As the overall strategy, the 11 work packages (WPs) of the work plan were grouped into 3 key phases: (1) RD basis for cost-effective sensor developmen...

In stalk of red hot pepper ( Capsicum annuum L.) with 0.25 mm, 0.5 mm and 1.0 mm particle sizes, the quantities of nutritive and volatile compounds, bioactive capsaicin and carotenoids were determined. Furthermore, the stalk was characterized using TGA, DSC and FTIR spectroscopy. The influence of the particle size on the content of proteins, ash an...