A surfactant-free, precursor-modulated nanoscale engineering approach for the synthesis of self-assembled flower-like 3D NiO nanostructures is reported. The method utilizes two distinct intermediate phases: ordered β-Ni(OH)₂ and turbostratic Ni₃(OH)₄(NO₃)₂ nanoplates. Through a combination of structural and spectroscopic techniques (XRD, SAED, TEM, HRTEM, SEM, AFM, UV–Vis, and DSC), the...
Nickel–iron catalysts supported on alumina are promising systems for the dry reforming of methane (DRM), combining high activity with relatively low cost and improved resistance to carbon deposition. In this work, the structural evolution of Ni–Fe/Al2O3 catalysts was studied under DRM conditions using SEM–EDX, XRD, and ferromagnetic resonance (FMR). Calcination produced NiO and Fe2O3/Fe3O4,...
The aim of this study was investigation of chemical elements and microplastics in air of the industrial zone of Kastriot (Obiliq) in Kosovo, by using mosses as a bioindicator. Moss samples were collected during June 2025, from 6 locations in Kastriot and Fushë Kosova municipalities. Moss samples were digestion in Teflon tubes by using HNO3 and H2O2, and then 18 chemical elements (Al, As, Ba,...
Industrial waste, generated through manufacturing, industrial and mining activities, represents a significant environmental challenge due to its potential to contaminate local soil and water resources, contaminating the groundwater, as well as lakes, streams, and rivers. A sustainable approach to mitigating these impacts involves the valorization of industrial residues as alternative raw...
Natural deep eutectic solvents (NADES) are emerging as eco-friendly alternatives to conventional solvents, offering higher extraction efficiency and lower environmental impact. This study investigated the potential of nineteen NADES, synthesized from choline chloride in combination with organic acids, carbohydrates, urea, and glycerol, for the extraction of phenolic acids.
The solvents were...
Organochlorine pesticides (OCPs), chlorobenzenes (CBs) and polychlorinated biphenyls (PCBs) are persistent organic pollutants characterized by high environmental stability and bioaccumulation. Although their use has been restricted, residues are still frequently detected in water, sediments, and biota as a result of intensive agricultural practices in the past and inadequate waste...
Rapid urban, industrial, and agricultural development in recent decades has increased water pollution, releasing a wide variety of contaminants into aquatic systems, with hydrophobic organic compounds (HOCs) being of particular concern. Their lipophilic nature may lead to bioaccumulation and biomagnification and can cause immune, reproductive, and endocrine disruption, posing risks to...
The paper investigates the draping behavior of different styles of women's skirts. The relationship between the garment draped area from various sides, mounted on a dummy, and the physical-mechanical properties of the textiles (drape coefficient, thickness, and GMS) was investigated. Two styles of women's skirts were constructed from fabrics having various fabric weights (157.6 to 296.5 g/m2)....
Klaudia Zielinkiewicz*a, b, Ewa Mijowskaa, b
a West Pomeranian University of Technology, Szczecin Faculty of Chemical Technology and Engineering, Department of Nanomaterials Physicochemistry, Piastow Ave. 45, 70-310 Szczecin, Poland
b Centre for Advanced Materials and Manufacturing Process Engineering (CAMMPE), West Pomeranian University of Technology, 70-310 Szczecin, Poland ...
Two-dimensional correlation spectroscopy (2DCOS) is a powerful technique for investigating structural changes initiated by some external perturbation. In this study 2DCOS analysis was applied to temperature-dependent FTIR spectra of ibuprofen powder, over the spectral region 500-2000 cm-1. This region covers key vibrational modes such as aromatic, carbonyl and C–O stretching vibrational modes....
Hypericum perforatum L. is a medicinal herb rich in various bioactive compounds, including procyanidins, phenolic acids, anthocyanins, xanthones, flavonoids, and naphthodianthrones. This study aimed to evaluate the selectivity of eco-friendly natural deep eutectic solvents (NADES) for extracting polyphenolic compounds from H. perforatum herbs and shoots.
Twenty NADES were prepared using...
Organochlorine pesticides, chlorobenzenes and polychlorinated biphenyls represent groups of persistent organic pollutants (POPs) highly resistant to degradation. Due to their chemical stability and lipophilic nature, they tend to accumulate both in the environment and in biological systems. Given their historical use in agriculture and industry, the Vardar River was selected for assessing...
Soda-lime-silica glass is widely utilized in industrial and domestic applications. In certain cases, changes in the surface properties are needed. This study investigates the surface modification of soda-lime-silica glass using tetraethyl orthosilicate (TEOS) dissolved in dry toluene and employing dip-coating method.
The modified surfaces were characterized using a range of analytical...
Selective hydroxylation of benzene to phenol remains a challenging reaction in green chemistry. In this work, liquid-phase hydroxylation of benzene with H2O2 over iron-containing mordenite was studied using dynamic light scattering (DLS) and ferromagnetic resonance (FMR) techniques to assess catalyst stability and structural changes under reaction conditions. Iron-modified mordenite samples...
This research investigates misconceptions in the teaching of chemistry to eighth-grade students by analyzing results from a municipal chemistry competition. The competition was designed to promote critical thinking and focused on core chemistry topics, including states of matter, metals and nonmetals, simple substances, compounds, and mixtures. The research sample included 506 eighth-grade...
The design of advanced luminescent materials increasingly relies on heteroatom-containing aromatic systems with finely tunable optical properties. Among these, pyrene derivatives and their isosteres, particularly azapyrenes, offer promising structural motifs for applications in organic electronics. This study presents the development of a synthetic strategy and the comprehensive...
Quinacridones are a class of fluorescent compounds sharing an aromatic structural motif, and as such, they can be employed as fluorophores when using both visual and instrumental techniques, especially for the research of biomolecules (DNA, RNA, saccharides, etc.). These compounds have a special advantage over other fluorophores, as they provide a solution to the problem posed by the...
Food packaging materials, often composed of multilayered components, may contain residual solvents that pose a potential health risk due to their ability to migrate into food products. To address this concern, regulatory agencies have established strict limits on solvent migration and intake—limits that are largely modeled after those used in the pharmaceutical industry to ensure consumer...
Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) are persistent organic pollutants (POPs) that resist environmental degradation. Due to their semi-volatility and lipophilicity, they are easily transported through air, water, soil, and food, and tend to bioaccumulate in living organisms. Long-term exposure to these compounds can cause various acute and chronic health...
The ring-spinning process is an important manufacturing process for the mass customization of clothing goods, especially for large-run yarns. Cop quality is one of the most important characteristics concerning ring-spun yarns. It is mainly evaluated and compared via the diameter of a cop. This study aimed to optimize the ring spinning parameters influencing the cop diameter. The optimization...
With the growing demand for sustainable and decentralized power sources to support the next generation of portable electronics and Internet of Things (IoT) devices, triboelectric nanogenerators (TENGs) have emerged as promising candidates for biomechanical energy harvesting1. In this study, we present the design and characterization of an origami-structured TENG fabricated using nylon and...
Waelz clinkers (slags), generated during the thermal treatment of zinc-bearing secondary resources in rotary kilns, represent a significant stream of industrial waste containing iron, calcium, silicon, and other valuable components. However, on a global scale, a large proportion of these materials are still landfilled, posing both environmental and economic challenges1,2. The limited capacity...
Camelina (Camelina sativa L) is a drought-tolerant oilseed crop valued for its short vegetative period and adaptability to low-quality soil. Its seeds contain 30–50% oil, rich in high polyunsaturated fatty acids (40-60%), and bioactive compounds such as phytosterols, tocopherols, carotenoids, chlorophylls, and phenolic compounds. Although these components contribute to the nutritional and...
High-entropy (oxy)(hydr)oxides have been recently proposed as promising materials for environmental remediation and electrocatalytic applications due to their ability to integrate multiple cations into a single structure. This compositional complexity generates synergistic effects that outperform those of single-metal systems. However, current synthesis methods largely overlook the chemical...
Soda-lime-silica glass is commonly used in both industrial and household settings due to its transparency, chemical resistance, availability and environmental friendliness. Enhancing the glass surface hydrophobic properties is sometimes necessary, as in the case of self-cleaning surfaces. This study investigates the surface modification of soda-lime-silica glass using tetraethyl orthosilicate...
The increasing number of wireless devices and sensitive electronics in modern smart
buildings requires strong protection against electromagnetic interference (EMI).
Traditional metallic shields are often too heavy and vulnerable to corrosive
degradation. Polymer composites reinforced with conductive nanomaterials, such as
graphene, offer a superior alternative due to their high electrical...
Nowadays, a huge global problem is climate change leading to increasing atmosphere pollution through the emission of carbon dioxide (CO2)1. The running out of non-renewable energy sources is driving scientists to look for better solutions to slow down the climate collapse.
The process of electrochemical splitting of water in two successive reactions: the oxygen evolution reaction (OER) and...
The organic-inorganic perovskites (HOIPs) have attracted significant attention as promising new materials for their broad applications, particularly in photovoltaics. Their use as materials for the construction of solar cells is particularly sought-after, given their relatively simple synthesis, low production cost, and environmental compatibility. In this study, the synthesis and...
SP
The Digital Signature of Metabolites: AI-Powered Biomarker Discovery
Metabolites are low–molecular-weight chemical compounds within cells, which together constitute the metabolome1. Metabolomic studies provide a near-real-time view of the phenotype. The resulting biomarker candidates show promise in personalized medicine, early detection, drug discovery and treatment-response...
The process of charging of the furnaces in R.Ž Topilnica j.s.c-Skopje
M.Sc.DarkoKazankov1 B.Sc. Emil Kazankov2
1Agency for Real Estate Cadastre Skopje, Macedonia, 2R.Ž Topilnica j.s.c-Skopje Macedonia
kazankov.darko@gmail.com; em.kazankov@gmail.com
Furnace charging is a continuous process during the operation of the furnaces. The level of the charge in the bunkers of the electric furnaces...
This study combines IRMPD spectroscopy and DFT calculations to analyze the structure, vibrations, and dynamics of protonated glycine in gas and tagged forms. Anharmonic frequency analyses matched experimental spectra, identifying key O–H and N–H vibrations. Simulations between 4–40 K showed conformational changes with temperature, while He and H₂ tagging stabilized ions and improved spectral...
A combined molecular dynamics – quantum mechanical model was developed, aiming at understanding of the THz spectroscopy of bulk liquid water. Classical molecular dynamics simulations, based on many-body interaction potentials derived specifically for water, were used to generate snapshots which were further subjected to quantum mechanical DFT calculations.
Selected clusters from 100 MD...
Trajce Trajkov, Nina Kaneva
Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1 James Bourchier Blvd., 1164 Sofia, Bulgaria
*Corresponding author’s e-mail: trajce_trajkov11@hotmail.com
Cephalexin is an organic compound and an antibiotic that often pollutes the environment and...
Purple phototrophic bacteria (PPB) are widely studied for their diverse metabolic capabilities and applications in biotechnology. However, successful isolation and cultivation of PPB are frequently hindered by contamination from various microorganisms. Typical contaminants include fast-growing heterotrophic bacteria such as Pseudomonas spp. and Bacillus spp., which outcompete PPB in...
Our recent research focuses on the reactions of the Schiff base
2-(diphenylphosphino)benzaldehyde with 3-nitrophenylhydrazine, yielding the condensation product L, and its coordination behaviour with different transition metals. In an initial try we reacted L with CuBr2 (1:1 molar ratio) in a warm MeOH solution of CuBr2 and a warm CH2Cl2 solution of L. Upon cooling to room temperature dark...
A UV spectrophotometric method was validated to determine ciprofloxacin (CIP) in Citeral® eye/ear drops. A 0.1 mol/L HCl solution was used as a solvent for preparing standards and samples. The spectra of the samples were recorded in the range of 240–400 nm. The method demonstrated linearity in the range of 0.1–20 μg/mL, with a correlation coefficient exceeding 0.99999, obtained from absorption...
