Ankica Šarić

Ruđer Bošković Institute | RBI · Division of Materials Physics

Citation: Eckelt, F.; Rothweiler, P.; Braun, F.; Voss, L.; Šarić, A.; Vrankić, M.; Lützenkirchen-Hecht, D. In Situ Observation of ZnO Nanoparticle Formation by a Combination of Time-Resolved X-ray Absorption Spectroscopy and X-ray Diffraction. Materials 2022, 15, 8186. https:// Abstract: The formation of ZnO nanomaterials from different Zn acetylac...

The success of the osseointegration process depends on the surface characteristics and chemical composition of dental implants. Therefore, the titanium dental implant was functionalised with a composite coating of alendronate and hydrolysed collagen, which are molecules with a positive influence on the bone formation. The results of the quantum che...

Microstructure and morphology of particles play key roles in optimizing the properties of shape-selected ZnO particles, which are essential factors for flexible and reliable applications. In particular, chemical understanding and physical measurement with scientific theory must be further integrated for the realization of finely tuned ZnO nano/micr...

Some commercial dental implants contain aluminum, which represents a potential risk to health, since aluminum is associated with neurodegenerative diseases such as Alzheimer’s disease. Therefore, control of the chemical composition as well as the surface characteristics of implants is necessary, and one approach is functionalization of the implant’...

Organophosphorus compounds, like bisphosphonates, drugs for treatment and prevention of bone diseases, have been successfully applied in recent years as bioactive and osseoinductive coatings on dental implants. An integrated experimental-theoretical approach was utilized in this study to clarify the mechanism of bisphosphonate-based coating formati...

Background: Nowadays investigations in the field of dental implants engineering are focused on bioactivity and osseointegration properties.Objective: In this study, the oxide-covered titanium was functionalized by vitamin D3 molecules via a simple self-assembly method with the aim to design more corrosion resistant and at the same time more bioacti...

Background Nowadays investigations in the field of dental implants engineering are focused on bioactivity and osseointegration properties. Objective In this study, the oxide-covered titanium was functionalized by vitamin D3 molecules via a simple self-assembly method with the aim to design more corrosion resistant and at the same time more bioacti...

Zinc oxide nanoparticles were preparedby a solvothermal synthesis using various alcoholic reaction solvents including ethanol, 1-propanol, 1-butanol, 1-pentanol and 1-octanol, at 170 °C. The nucleation and growth processes of the ZnO nanoparticles were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM)...

Inorganic materials that enable a link between the storage and release of molecular oxygen offer a fertile ground in continuous quest for the applications that can potentially reduce energy consumption and thus minimize adverse effects on the environment. Herein, we address reversible intake/release of an oxygen within the BaAl2O4 material as evide...

In recent years, extensive studies have been continuously undertaken on the design of bioactive and biomimetic dental implant surfaces due to the need for improvement of the implant–bone interface properties. In this paper, the titanium dental implant surface was modified by bioactive vitamin D3 molecules by a self-assembly process in order to form...

Zinc oxide particles were synthesized from zinc acetylacetonate in the presence of triethanolamine (TEA) and various alcoholic solvent, ethanol or octanol, at 170°C. The structural, optical and morphological characteristics of ZnO particles were monitored using X-ray powder diffraction (XRD), UV-Vis and FT-IR spectroscopies and field emission scann...

The solvothermal synthesis of ZnO particles from zinc acetylacetonate [Zn(acac)2] in the presence of monoethanolamine (MEA) or triethanolamine (TEA) at 170 °C is reported. The structural, optical and morphological characteristics of ZnO particles have been studied by X-ray diffraction, UV-Vis spectroscopy, FE-SEM and TEM/STEM microscopy. The experi...

The synthesis of high silica zeolites in many cases implies the usage of organic structural direction agents (SDA). However, to manifest their functionalities, the SDA occluded inside the channels of the as-synthesized structure should be removed, usually by a high temperature treatment (calcination). In this paper, the positron annihilation lifeti...

Powder sample of pure BaAl2O4 and one doped with 4.9 at% Eu in relation to barium were preparedby a hydrothermal method and subsequent annealing at 1100 oC for 4 h. Both samples were characterized by synchrotron based X-ray absorption spectroscopy. The transmission mode Eu and Ba L3-edge X-ray absorption experiments of the prepared samples were per...

Nanocrystalline sample of pure BaAl2O4 and one of BaAl2O4 doped with 4.9 at% Eu in relation to barium were prepared by a hydrothermal method. Both samples were characterized by synchrotron based X-ray absorption spectroscopy. The EXAFS experiments at the Ba and Eu L3-edges have been performed in order to study the local environment of the Eu3+ dopa...

Zinc oxide particles were synthesized without the addition of water by autoclaving (anhydrous) zinc acetate/alcohol and zinc acetate/acetic acid/alcohol solutions at 160 °C. The solvothermal synthesis was performed in ethanol or octanol. The structural, optical and morphological characteristics of ZnO particles were investigated by X-ray diffractio...

Powder BaAl2O4 samples doped with 0 and 1.76 atom % Cr in relation to Al were hydrothermally prepared. Both samples were characterized by X-ray diffraction and synchrotron based X-ray absorption spectroscopy at the Cr K- and the Ba L3-edge. Diffraction patterns indicated that samples were nanocrystalline with a hexagonal crystal structure, space gr...

Formation of hollow ZnO particles by simple hydrolysis of zinc acetylacetonate [Zn(acac)2] at 90 °C was monitored. Isolated precipitates were characterized with XRD, FT-IR and FE-SEM. Different amounts of Zn(acac)2 underwent the hydrolysis in 1 × 10−3 M NaOH for 24 h. The conditions for the formation of hollow ZnO particles were determined and the...

The hydrolysis at 90°C of zinc acetylacetonate [Zn(acac)2] in solutions containing sodium hydroxide and trisodium citrate was monitored using Raman and FT-IR spectroscopies and field emission scanning electron microscopy. The size and shape of the precipitated particles depended on the initial mole ratio [Zn(acac)2]/[Na3-citrate] and initial NaOH c...

Formation of ZnO particles by thermal decomposition of zinc acetylacetonate monohydrate in air atmosphere has been investigated using XRD, DTA, FT-IR, and FE-SEM as experimental techniques. ZnO as a single phase was produced by direct heating at ≥200 °C. DTA in air showed an endothermic peak at 195 °C assigned to the ZnO formation and exothermic pe...

Amorphous rhodium (hydrous)oxide precursor was prepared from Rh(NO3)3 aqueous solution using NH4OH solution as a precipitating agent. The precipitate was subsequently washed, dried at 60°C, then heated in air atmosphere up to 650°C. Samples were characterised by XRPD, FT-IR, RAMAN, FE-SEM and EDS. The XRPD of sample prepared at 400°C showed a broad...

The influence of the combined application of cisplatin and sevoflurane on a variety of cell types of healthy mice or mice bearing Ehrlich ascites tumour has been investigated in an in vivo study. The alkaline comet assay method was carried out on peripheral blood leucocytes, brain, liver, kidney and tumour cells of healthy mice or mice bearing Ehrl...

The influence of experimental conditions on the precipitation of ZnO particles and their microstructural properties has been investigated using X-ray powder diffraction, Fourier transform infrared spectroscopy and thermal field emission scanning electron microscopy. Mixing of ZnCl2 or Zn(ac)2 solution with Na2CO3 solution of proper concentrations y...

The synthesis of nanocrystalline RuO2 powders by combining “wet” chemical precipitation, autoclaving and thermal treatment of amorphous precursors has been investigated. Amorphous RuO2 precursors were precipitated from RuNO(NO3)3 or RuCl3 solutions by adding NH4OH solution up to ∼pH 5. The samples were characterized by DTA, XRD, FT-IR spectroscopy...

Two methods were used to prepare amorphous rhodium hydrous oxide precursors: (a) precipitation from Rh(NO3)3 solution containing urotropin at 90 °C and (b) precipitation from Rh(NO3)3 solution at a very high pH, as adjusted with NaOH. Nanocrystalline metallic rhodium was produced by heating at 300 °C in air of the precipitate obtained by method (a)...

Amorphous rhodium hydrous oxide precursors, precipitated from an Rh(NO3)3 solution with the addition of NH3, NaOH or urotropin, were thermally treated in the range 300–1000°C. The obtained amorphous rhodium hydrous oxide precursors and their thermal decomposition products were studied by X-ray powder diffraction, Fourier transform infrared spectros...

The effects of urotropin on the hydrolysis of Fe3+ ions in NH4Fe(SO4)2 solutions at 90 °C were investigated using X-ray powder diffraction, 57Fe Mössbauer spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. Three concentrations of NH4Fe(SO4)2 solutions, 0.03, 0.1 and 0.5 M, with varying initial amounts of ur...

Iron oxides (group name) were precipitated by the hydrolysis of Fe(NO3)3 solutions in the presence of urotropin (hexamethylenetetramine). In an acidic medium at elevated temperature, urotropin undergoes hydrolysis with a gradual release of OH− ions. The precipitation time varied between 5h and 21days. The typical IR bands of the iron oxide phases w...

The chemical and microstructural properties of oxide phases obtained by forced hydrolysis of Fe3+ ions at 90 °C, were investigated using X-ray powder diffraction, Fourier transform infrared spectroscopy, 57Fe Mössbauer spectroscopy and transmission electron microscopy. Urotropin (hexamethylenetetramine) was used as a generator of OH- ions. After 5...

Precipitations of iron oxides from FeCl3 solutions in the presence of urotropin at 90°C were monitored using the Fourier transform infrared spectroscopy, Mössbauer spectroscopy, X-ray diffraction and transmission electron microscopy. Urotropin was used as a generator of OH- ions. The precipitation processes depended on the concentrations of FeCl3 a...

The precipitation of Fe–oxides was performed by adding NaOH or urotropin to FeCl3 solutions and aging the precipitation systems at 90°C. Phase composition and microstructural properties of Fe–oxide powders were investigated using Fourier transform infrared spectroscopy, Mössbauer spectroscopy, X-ray diffraction and transmission electron microscopy....

The effects of urotropin (hexamethylenetetramine) on the chemical and microstructural properties of Fe-oxide powders, prepared by FeCl3 hydrolysis in aqueous solutions at 90°C, were investigated using X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR) and 57Fe Mössbauer spectroscopy. In the ab...

β-FeOOH (akaganéite) in the form of needles, stars, and X- and Y-shaped particles was produced by hydrolysis of 0.1 m FeCl3 solution at 90°C. After 5 h of hydrolysis a pronounced decrease in particle size and the destruction of β-FeOOH morphologies, with an increase of urotropin concentration from 0.005 m to 0.25 m, were observed by XRD and TEM. Th...