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Konferencijska knjiga "Korak u iskorak 2025"
No full textKonferencijska knjiga Korak u iskorak 2025, održane 11. decembra 2025. u Madlenianumu, Zemun
Study of the Effect of Supersaturation Changes on the Growth of {100} KDP Crystal Faces
No full textThis study investigates the growth of {100} KDP crystal faces under varying supersaturation conditions of 6.2–14.7%. The findings indicate that the positions of growth rate maxima differ between experiments where supersaturation increases or decreases, with higher rates associated with decreasing supersaturation. Surface analysis via SEM and AFM revealed that higher supersaturation resulted in greater roughness. The growth rate on supersaturation dependence R(σ) for both types of experiments was best described by parabolic and power law models, indicating spiral growth. A significant percentage of crystal faces exhibited an exponent n > 2, suggesting the relevance of the multiple nucleation model. Additional analysis excluded the suggested model in favor of the polynuclear model. No significant difference was found between the arithmetic means of n values for both types of experiments, suggesting that for the investigated supersaturation range, the growth mechanism of {100} KDP crystal faces is independent of growth history
Synthesis and Characterization of Cu/Mo Composite System and Influence of Additives on Crystallite Size, Roughness and Microhardness Features of Cu Layer
No full textElectrodeposited thin copper coatings from an
acid sulfate bath without/with combination of organic/nonorganic
additives on molybdenum (Mo) cathodes were
synthesized. Direct current (DC) galvanostatic regime was used
at constant current density at 50 mA· cm-2 and fixed deposition
time. The structure of the synthesized Cu coatings on Mo
substrate was obtained using AFM and XRD devices. X-ray
diffraction analysis was conducted by Williamson-Hall (W-H)
and Halder-Wagner (H-W) models for calculated crystallite size
and lattice strain of Cu coatings. The microindentation Vickers
technique was applied to investigate microhardness of the
Cu/Mo composite system and coating free-Mo substrate. The
correlation between copper crystallite size, microhardness and
roughness are discussed
Genipin- and potassium-crosslinked chitosan/carrageenan hydrogels as 3D scaffolds for cultivated meat production
No full textCultivated meat (CM) is a promising future source of alternative protein. However,
scaffolds often used in CM production are animal-derived; to develop completely animal
product-free CM, alternative scaffolds are necessary. Algal polysaccharides such as
carrageenan and chitosan form stable hydrogels which could possibly be used to grow
CM due to their high-water content, porosity and cell-adhesive properties. Genipin, a
biocompatible chemical cross-linker derived from Genipa americana and Gardenia
jasminoides, can be used to produce chitosan hydrogels, and potassium ions can be used
to physically cross-link carrageenan. Simultaneously cross-linking both polysaccharides
in solution possibly results in them forming an inter-penetrating network (IPN), giving
the resulting combined chitosan/carrageenan (CC) hydrogel greater strength and
stability. The ability of quail muscle 7 (QM7) cells to adhere to, and grow on, these
hydrogels was assessed using an Alamar blue assay, using gelatin hydrogels as a control.
It was found that cell growth on CC gels over a period of 7 days was comparable to cell
growth on gelatin hydrogels. CC gel structure was further studied using scanning
electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy
The assessment of rosehip (Rosa Canina L.) pseudo-fruit antioxidant capacity: electrochemical vs. spectrophotometric methods pre- and post- in vitro gastrointestinal digestion
No full textExtracts of Rosa canina L. have been traditionally utilized
in nutrition due to their high concentration of vitamin C
and other bioactive compounds, including polyphenols.
The total antioxidant capacity (TAC) of these bioactive
components serves as a critical parameter for evaluating the biological value of the extract. Conventional
spectrophotometric methods have been widely employed for TAC quantification. However, electrochemical
techniques present distinct advantages, including rapid
analysis, lower costs, and minimal sample preparation.
This study aims to compare electrochemical and spectrophotometric methods for TAC determination in Rosa
canina L. pseudo-fruit extract before and after in vitro
gastrointestinal digestion. TAC was assessed in dried
pseudo-fruit extract, the liquid phase post-digestion,
and the solid phase post-digestion using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and
the ABTS and Folin-Chiocalte spectrophotometric assay.
The results indicate that the TAC of the undigested pseudo-fruit extract was significantly higher than that of the
digested samples, with the liquid phase exhibiting greater TAC than the solid phase. The electrochemical methods (CV
and DPV) produced highly consistent results, whereas the ABTS and Folin-Chiocalte assay yielded slightly lower TAC values post-digestion. The electrochemical approaches demonstrated a substantial reduction in analysis time, as TAC measurements were obtained within seconds without the need for extensive sample preparation, unlike spectrophotometric
methods. These results underscore the potential of electrochemical techniques, especially differential pulse voltammetry,
as reliable, rapid alternatives to traditional spectrophotometric assays for routine TAC determination in plant extracts.
Moreover, electrochemical methods may overcome the limitations of spectrophotometric analysis, such as lower sensitivity and prolonged analytical procedures, thereby enhancing the efficiency and applicability of antioxidant capacity
assessments in nutritional and pharmaceutical research.United Nations Sustainable Development Goals: 2 - Zero hunger and 3 - Good Health and well-bein
Preparation and characterization of Chromolith WP 300 Epoxy HPLC column with immobilized MALT1
No full textIn recent years, there has been increasing interest in the preparation and characterization of biomimetic HPLC
systems that are able to estimate specific biological properties relevant to drug discovery. The estimation of biological
properties can be achieved by measuring retention in HPLC systems. One of the major advantages of using HPLC
technology for this purpose is that different stationary phases mimicking biological systems can be used. Mucosa-associated
lymphoid tissue lymphoma translocation protein-1 (MALT1) is a human paracaspase which has central
role in the immune response. In addition, MALT1 is responsible for the cleavage of various proteins and has a
scaffolding function. Consequently, small molecule MALT1 inhibitors could be promising candidates for clinical use in
allergic inflammation or autoimmune diseases. The aim of this work was to prepare and characterize a Chromolith WP
300 Epoxy HPLC column with immobilized MALT1. The immobilization of MALT1 was done using the epoxy method.
First, the column was equilibrated with an immobilization solution. Immobilization was then performed using a
dynamic process in which the MALT1 solution was circulated through the column for 24 hours. Finally, the column
was washed to quench the remaining epoxide functions. The prepared column was tested for reproducibility, organic
solvent content compatibility, and column linear range. Furthermore, MALT1 inhibitors with known activities towards
the protein were injected and correlation between activity and retention of the compounds was investigated. In
addition, the column was evaluated using the Abraham solvation parameter model. These results can be used as
the basis for further optimization of columns with immobilized MALT1. The preparation and characterization of new
biomimetic HPLC column with immobilizing proteins associated to specific pathologies may have a major impact on
drug discovery due to the numerous potential applications
Activity and Operational Loss of IrO2-Ta2O5/Ti Anodes During Oxygen Evolution in Acidic Solutions
No full textThe oxygen-evolving IrO2-Ta2O5/Ti anode (OEA), primarily used in electrolyzers for plating, metal powder production, electrowinning (EW), and water electrolysis, is analyzed. This study focuses on the distribution of oxygen evolution reaction (OER) activity and the associated operational loss over the randomized OEA texture. The OER activity and its distribution across the IrO2-Ta2O5 coating surface are key factors that influence EW operational challenges and the lifecycle of OEA in EW processes. To understand the OER activity distribution over the coating’s randomized texture, we performed analyses using anode polarization in acid solution at both low and high (EW operation relevant) overpotentials and electrochemical impedance spectroscopy (EIS) during the OER. These measurements were conducted on anodes in both their as-prepared and deactivated states. The as-prepared anode was deactivated using an accelerated stability test in an acid solution, the EW simulating electrolyte. The obtained data are correlated with fundamental electrochemical properties of OEA, such as structure-related pseudocapacitive responses at open circuit potential in the same operating environment. OER and Ir dissolution kinetics, along with the physicochemical anode state upon deactivation, are clearly characterized based on current and potential dependent charge transfer resistances and associated double layer capacitances obtained by EIS. This approach presents a useful tool for elucidating, and consequently tailoring and predicting, anode OER activity and electrolytic operational stability in industrial electrochemical applications
Enhancing Electrochemical Sensors Utilizing Metal–Organic Frameworks: Adjustable Architectures and Electrochemical Behaviors
No full textMetal-organic framework (MOFs) have gained significant attention for their potential applications in catalysis, batteries, separation, and gas sensing1. Composed of inorganic metal 'nodes' and organic 'node linkers,' these materials boast exceptional properties such as tunable pore sizes, large surface areas, and high catalytic activity, render them highly sought-after for electrochemical sensing applications. Their design can be enhanced by incorporating rare earth element (REE) metal cations, allowing the creation of MOFs with unique characteristics.2.
In this study, we present the synthesis of various MOFs containing different organic ligands alongside REEs—specifically samarium and dysprosium. Initially, we performed the synthesis of several organic ligands that feature multiple carboxylic groups and which vary in their electronic properties, size, and symmetry. These ligands were employed to fabricate MOFs. The impact of the organic ligands on the structure and electrochemical properties of the resulting MOFs was investigated utilizing advanced morphological and electrochemical techniques. The findings offer valuable insights into the potential for utilizing MOFs in electrochemical sensor development and pave the way for exploring the efficacy of various ligands in synthesizing electrochemically advantageous MOFs.[https://airdrive.eventsair.com/eventsairwesteuprod/production-discongress-public/9f8385d2e72a4542a79eed8b8647440d]Program: [https://discongress.eventsair.com/2503-esoc-2025/#isr-2024-preliminary-programme
Characterization of biochar-alumina composites obtained by catalyzed pyrolisis of oak sawdust
No full textBiochar refers to a solid product similar to charcoal, produced through the pyrolysis of biomass in a total or partial absence of oxygen. Beside the effects of the raw material, the parameteres of pyrolysis such as heating rate, tempearture and duration of carbonization, applied atmosphere greatly affects the properties of the final product. The investigation of various activators added before or after carbonization of biomass on the properties of the final product was also investigated. In this research biochar-alumina composites obtained through catalysed pyrolisis of biomass were investigated. The oak sawdust was used as a raw material, while two types of alumina (anhydrous (A) and trihydrate (T) alumina) were used as catalyst. The sawdust was mixed and grounded with
catalyst in mass ratios: 1:1, 2:1 and 10:1 and pyrolised in the air limited atmosphere at 400 oC for 1 h. The obtained composites were charaterized by low-temperture N2 physisorption, SEM and electrochemical methods. The obtained results showed that the type of alumina and of the sawdust/catalyst ratio had
significant effect on the final properties of the material. The possibility for application of these materials for electroanalytical purpose will be investigated
Insight into the Morphology, Hydrophobicity and Swelling Behavior of TiO2-Reinforced Polyurethane
No full textIn this research, the structure, morphology, hydrophobicity and swelling behavior
of a polyurethane (PU) network and its composites (PUCs) were examined. PUCs were
synthesized by the incorporation of different percentages (0.5, 1 and 2 wt.%) of unmodified
or surface-modified TiO2 nanoparticles into a PU network based on polycaprolactone,
aliphatic hyperbranched polyester and isophorone diisocyanate. In order to improve
interfacial interactions, the surface of the TiO2 nanoparticles was chemically modified with
lauryl gallate. The impact of the presence and content of unmodified or surface-modified
TiO2 nanoparticles on the cross-sectional and surface morphology, swelling behavior and
hydrophobicity of the PU network was assessed by different experiments. The obtained
findings revealed that the incorporation of TiO2 nanoparticles brought a more pronounced
irregular cross-sectional and rougher surface morphology, better microphase separation,
higher values of the equilibrium swelling degree in tetrahydrofuran and toluene, and
altered water contact angles compared to the neat PU. Based on the collected results, the
practical applicability of the prepared PUCs may be in the area of protective coatings