Repository of University of Nova Gorica

Search the repository
A+ | A- | Help | SLO | ENG

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


101 - 110 / 5560
First pagePrevious page78910111213141516Next pageLast page
101.
102.
103.
104.
105.
106.
In Situ Techniques for Characterization of Layered Double Hydroxide-Based Oxygen Evolution Catalysts
Andraž Mavrič, Matjaž Valant, 2023, review article

Abstract: Functional layered double hydroxide (LDH) usually contains different cationic substitutes to increase the activity of the oxygen evolution reaction (OER). The intrinsic OER activity of LDH materials is connected with the chemical composition and dispersion of metal cations substitutions in the matrix phase. The potential induced phase transitions, in particular hydroxide-to-oxyhydroxide transitions, are a predisposition for the high OER activity of LDH materials and can be followed by coupling the electrochemical experiments with spectroscopic techniques. The understanding of LDH catalysts under electrochemical conditions also allows an understanding of the behavior of OER catalysts based on transition metals, metal-chalcogenides, -pnictides, -carbides, and metal–organic frameworks. The surfaces of those materials are intrinsically poor OER catalysts. However, they act as precursors to catalysts, which are oxidized into a metal (oxy)hydroxide. This review summarizes the use of in situ techniques for the characterization of LDH-based OER electrocatalysts and presents the influence of these techniques on the understanding of potential induced phase transitions, identification of active sites, and reaction mechanisms.
Keywords: oxygen evolution reaction, layered double hydroxide, in-situ characterization
Published in RUNG: 14.07.2023; Views: 289; Downloads: 3
.pdf Full text (5,05 MB)
This document has many files! More...

107.
Sensitivity of the Cherenkov Telescope Array to TeVohoton emission from the Large Magellanic Cloud
Atreya Acharyya, Danilo Zavrtanik, 2023, original scientific article

Keywords: Pospeševalniki delcev, veliki Magellanov oblak, temna snov, žarki gama
Published in RUNG: 14.07.2023; Views: 270; Downloads: 0
This document has many files! More...

108.
Are Dolphins' Clicks Used for Communication?
Artur Stepanov, 2023, professional article

Keywords: živalstvo, biologija, komunikacija, jezikoslovje
Published in RUNG: 13.07.2023; Views: 275; Downloads: 1
URL Link to file
This document has many files! More...

109.
Separation of mercuric ions using 2-thienylbenzimidazole/cucurbit[7]uril/iron-oxide nanoparticles by pH control
Falguni Chandra, Paltan Laha, Farah Benyettou, Tina Skorjanc, Na'il Saleh, 2023, original scientific article

Abstract: 2-Thienylbenzimidazole (TBI)/cucurbit[7]uril (CB7) host–guest complex was used as a motif to significantly improve the turnover of γ-Fe3O4 magnetic nanoparticles for potential application in the separation of toxic mercuric ions in polluted water samples. The mechanism of restoring the original solid materials is based on applying the pH-controlled preferential binding of the CB7 host to the TBI guest. The analytical application of this concept has not been realized in the literature. The pH-controlled stimuli-responsive abilities were confirmed in aqueous solution by the three-order of magnitudes higher stability constant of the protonated TBIH+/CB7 complex (e.g., K = 4.8 × 108 M−1) when compared to neutral TBI/CB7 complex (e.g., K = 2.4 × 105 M−1), also manifested in an increase in pKa values by ~ 3.3 units in the ground state. The supramolecular interaction and adsorption on iron oxide nanoparticles (NPs) were also spectroscopically confirmed in the solid state. The excited-state lifetime values of TBI/CB7NPs increased upon lowering the pH values (e.g., from 0.6 to 1.3 ns) with a concomitant blue shift of ~ 25 nm because of polarity effects. The time-resolved photoluminescent behaviors of the final solids in the presence of CB7 ensured pH-driven reusable systems for capturing toxic mercuric ions. The study offers a unique approach for the controllable separation of mercury ions using an external magnet and in response to pH through preferential binding of the host to guest molecules on the top of magnetic surfaces.
Keywords: iron oxide nanoparticles (IONPs), mercury, thienylbenzimidazole, cucurbit[n]uril
Published in RUNG: 13.07.2023; Views: 312; Downloads: 0
This document has many files! More...

110.
Biological applications of porous polymers and covalent organic frameworks
Tina Škorjanc, 2023, invited lecture at foreign university

Abstract: Porous organic polymers (POPs) and covalent organic frameworks (COFs) have gained significant attention in the scientific community for a wide array of applications because of their attractive physical and chemical properties. Porosity of these materials provides ample surface area for interaction with targets, while crystallinity allows for highly specific structural tuning. In this seminar, I will present two strategies of utilizing these features of newly prepared materials in biosensing. Firstly, a cationic POP was synthesized, deposited onto interdigitated electrode arrays via a nontraditional electrophoresis technique, and utilized for electrochemical sensing of bacterial cells. As the principle of detection relied on electrostatic interactions between the cationic POP and the anionic bacterial surface, the sensor operated for both Gram-positive and Gram-negative bacteria. Secondly, a small-molecule nitroimidazole target for hypoxia, a low oxygen environment present in tumors, was post-synthetically conjugated to the pores of a fluorescent COF. This material served as a useful hypoxia imaging agent in cancerous cells. The seminar will conclude with some future perspectives on POPs and COFs in biological applications followed by Q & A.
Keywords: Porous organic polymers, covalent organic frameworks, biosensors, hypoxia
Published in RUNG: 13.07.2023; Views: 264; Downloads: 0
This document has many files! More...

Search done in 0.43 sec.
Back to top