Search

Your search keyword '"Baltrunas, Dalis"' showing total 30 results
Start Over Author "Baltrunas, Dalis"
30 results on '"Baltrunas, Dalis"'

18. Synthesis and functionalization of rod-like iron oxide nanoparticles

Author

Alves Marins, Jéssica, Montagnon, Tom, Ezzaier, Hinda, Bée, Agnès, Talbot, Delphine, Sandre, O., Baltrunas, Dalis, Mazeika, K, Petrov, Alexander, Kalanda, N, Kuzhir, Pavel, Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Team 3 LCPO : Polymer Self-Assembly & Life Sciences, Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Nuclear Gamma Resonance Laboratory, State research institute Center for Physical Sciences and Technology, and Cryogenic Research Division, Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

24. The influence of Fe3+ doping on thermally induced crystallization and phase evolution of amorphous calcium phosphate.

Author

Griesiute, Diana, Sinusaite, Lauryna, Kizalaite, Agne, Antuzevics, Andris, Mazeika, Kestutis, Baltrunas, Dalis, Goto, Tomoyo, Sekino, Tohru, Kareiva, Aivaras, and Zarkov, Aleksej

Subjects
CALCIUM phosphate, CRYSTALLIZATION, DOPING agents (Chemistry), MOSSBAUER spectroscopy, ELECTRON paramagnetic resonance spectroscopy, THERMAL analysis
Abstract

The present study investigates thermally induced crystallization and phase evolution of amorphous calcium phosphate (ACP) partially substituted with Fe3+ ions (M/P = 1.5 : 1). It was demonstrated that the presence of Fe3+ ions radically changes the crystallization behavior of ACP and completely prevents the formation of α-tricalcium phosphate (α-TCP, Ca3(PO4)2), which is the first crystalline phase obtained from non-substituted ACP upon thermal treatment. Surprisingly, calcium deficient hydroxyapatite (CDHA) was obtained instead of α-TCP. Such unusual crystallization behavior was observed with a doping level as low as 0.1 mol% with respect to Ca ions. Moreover, it was shown that the presence of Fe3+ ions significantly reduces the crystallization temperature of ACP, which started already at around 400 °C, whereas pristine ACP crystallizes to α-TCP only at around 600 °C. In the presence of Fe3+ ions β-TCP was also obtained at reduced temperature, compared to the formation from non-substituted ACP. The temperature of the complete conversion of CDHA to β-TCP was found to be dependent on the concentration of Fe3+ ions. The crystallization process and phase evolution were monitored employing thermal analysis, XRD, FTIR, Raman, EPR and Mössbauer spectroscopies. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

27. Fabrication of Barbed-Shaped SnO@SnO2 Core/Shell Nanowires

Author

Jagminas, Aru̅nas, primary, Morales, Francisco M., additional, Mažeika, Kestutis, additional, Veronese, Giulio P., additional, Reklaitis, Jonas, additional, Lozano, Juan G., additional, Mánuel, José M., additional, García, Rafael, additional, Kurtinaitienė, Marija, additional, Juškėnas, Remigijus, additional, and Baltru̅nas, Dalis, additional

Published
2011
Full Text
View/download PDF

28. Fabrication of Barbed-Shaped SnO@SnO2Core/Shell Nanowires

Author

Jagminas, Aru̅nas, Morales, Francisco M., Mažeika, Kestutis, Veronese, Giulio P., Reklaitis, Jonas, Lozano, Juan G., Mánuel, José M., García, Rafael, Kurtinaitienė, Marija, Juškėnas, Remigijus, and Baltru̅nas, Dalis

Abstract

The interest in core/shell nanowires (Nws) is stimulated by the importance of fabricating materials possessing unique magnetic, catalytic, or optical properties relative to ones of their bulk parents. Here, the fabrication of a novel design of core−shell SnO@SnO2Nws via heat treatment of Sn Nws, fully encapsulated inside the pores of alumina matrix, is demonstrated. Under this scenario, densely packed arrays of barbed-shaped Nws, possessing extremely high surface areas, have been fabricated. 119Sn Mössbauer effect spectroscopy, high-resolution transmission electron microscopy (HRTEM), field-emission scanning electron microscopy (FESEM), and X-ray diffraction spectroscopy (XRD) were used to study the morphology and composition of the end-products. In addition, electron energy-loss spectroscopy (EELS) was successfully applied here to detect the ionization edges of tin and oxygen in the core and shell part of single Nw.

Published
2011
Full Text
View/download PDF

29. The Synthesis and Characterization of Sol-Gel-Derived SrTiO 3 -BiMnO 3 Solid Solutions.

Author

Karoblis, Dovydas, Diliautas, Ramunas, Raudonyte-Svirbutaviciene, Eva, Mazeika, Kestutis, Baltrunas, Dalis, Beganskiene, Aldona, Zarkov, Aleksej, and Kareiva, Aivaras

Subjects
X-ray powder diffraction, SOL-gel processes, SCANNING electron microscopy, CHEMICAL bond lengths, PARAMAGNETIC materials
Abstract

In this study, the aqueous sol-gel method was employed for the synthesis of (1−x)SrTiO3-xBiMnO3 solid solutions. Powder X-ray diffraction analysis confirmed the formation of single-phase perovskites with a cubic structure up to x = 0.3. A further increase of the BiMnO3 content led to the formation of a negligible amount of neighboring Mn3O4 impurity, along with the major perovskite phase. Infrared (FT-IR) analysis of the synthesized specimens showed gradual spectral change associated with the superposition effect of Mn-O and Ti-O bond lengths. By introducing BiMnO3 into the SrTiO3 crystal structure, the size of the grains increased drastically, which was confirmed by means of scanning electron microscopy. Magnetization studies revealed that all solid solutions containing the BiMnO3 component can be characterized as paramagnetic materials. It was observed that magnetization values clearly correlate with the chemical composition of powders, and the gradual increase of the BiMnO3 content resulted in noticeably higher magnetization values. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results