Ce/Sm/Sr-Incorporating Ceramic Scaffolds Obtained via Sol-Gel Route

Jinga, Sorin‐Ion; Anghel, Ana-Maria; Brincoveanu, Silvia-Florena; Bucur, Raluca-Maria; Florea, Andrei-Dan; Saftau, Bianca-Irina; Stroe, Stefania-Cristina; Zamfirescu, Andreea-Ioana; Busuioc, Cristina

doi:10.3390/ma14061532

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…The last stage of mass loss takes place between 420 and 600 °C and is linked with an endothermic process, certainly due to the completion of nitrate decomposition. At higher temperatures, between 600 and 800 °C, several weight variations occur, presumably generated by the accidental carbonation of some species in the sample with CO 2 from the atmosphere, resulting in compounds that are weakly crystalline and decarbonate in this temperature range [ 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is well-known that the signals of Si–O bonds can be identified in the range of 800–1100 cm −1 . If, in the FTIR spectra of the gel, there are two wide and low bands centred at around 1080 and 950 cm −1 , associated with the stretching vibrations of Si–O–Si bonding, the situation is different in the FTIR spectra of the thermally treated ceramics: both Si–O–Si and Si–O bonding are visible, integrated into a complex band with multiple peaks; more precisely, antisymmetric and symmetric stretching vibrations of Si–O–Si bridging oxygen bonds in SiO 4 4− tetrahedra, as well as Si–O–Ca and Si–O–Mg non-bridging oxygen bonds overlap and give rise to a broad and jagged band [ 53 , 54 ]. In the case of the signals that emerged below the value of 600 cm −1 , the fingerprints of O–Ca–O and O–Mg–O bonding can be identified as bending vibrations at 510 and 540 cm −1 , respectively; Mg–O contribution is sometimes integrated into Ca–O contribution or detected as a shoulder [ 55 , 56 ].…”

Section: Resultsmentioning

confidence: 99%

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Processing of Calcium Magnesium Silicates by the Sol–Gel Route

Alecu

Costea

Surdu

et al. 2022

Gels

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In this work, calcium magnesium silicate ceramics were processed through the sol–gel method in order to study the crystalline and morphological properties of the resulting materials in correlation with the compositional and thermal parameters. Tetraethyl orthosilicate and calcium/magnesium nitrates were employed as sources of cations, in ratios specific to diopside, akermanite and merwinite; they were further subjected to gelation, calcination (600 °C) and thermal treatments at different temperatures (800, 1000 and 1300 °C). The properties of the intermediate and final materials were investigated by thermal analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and Rietveld refinement. Such ceramics represent suitable candidates for tissue engineering applications that require porosity and bioactivity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Processing of Calcium Magnesium Silicates by the Sol–Gel Route

Alecu

Costea

Surdu

et al. 2022

Gels

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“…First, they are characterized by the stability of the physical and chemical behavior over a wide temperature range, biocompatibility, and mechanical hardness. The combination of these properties makes them promising candidates for a wide range of applications in mechanical engineering [ 14 , 15 , 16 ], medicine [ 17 , 18 ], sensing technology [ 19 , 20 ], anticounterfeiting [ 21 , 22 ], and others [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and Energy Transfer in Double- and Triple-Lanthanide-Doped YVO4 Nanoparticles

et al. 2022

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Optical materials doped with several lanthanides are unique in their properties and are widely used in various fields of science and technology. The study of these systems provides solutions for noncontact thermometry, bioimaging, sensing technology, and others. In this paper, we report on the demonstration of YVO4 nanoparticles doped with one, two, and three different rare earth ions (Tm3+, Er3+, and Nd3+). We discuss the morphology, structural properties, and luminescence behavior of particles. Luminescence decay kinetics reveal the energy transfer efficiency (up to 78%) for different ions under the selective excitation of individual ions. Thus, we found that the energy transition from Tm3+ is more favorable than from Er3+ while we did not observe any significant energy rearrangement in the samples under the excitation of Nd3+. The observed strong variation of REI lifetimes makes the suggested nanoparticles promising for luminescent labeling, anticounterfeiting, development of data storage systems, etc.

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The Effect of Silver and Samarium on the Properties of Bioglass Coatings Produced by Pulsed Laser Deposition and Spin Coating

Lavric,

Vreme,

Busuioc

et al. 2023

JFB

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The current study reports the use of silver (Ag) and samarium (Sm) as dopants to improve the properties of standard bioglass in terms of biological performance. This experiment considers thin films of doped bioglass obtained by pulsed laser deposition (PLD) and spin coating (SC). For both methods, some parameters were gradually varied, as the main objective was to produce a bioglass that could be used in biomedical fields. In order to study the morphology, the phase composition and other properties, the samples obtained were subjected to multiple analyses, such as thermal analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared (FT-IR), Raman spectroscopy, and x-ray diffraction (XRD). Furthermore, the in vitro bioactivity of the samples, as assessed through simulated body fluid (SBF) immersion, as well as immunocytochemistry and evaluation of actin filaments, assessed through fluorescence microscopy, are reported. The results confirmed the formation of the designed vitreous target employed as the source of material in the PLD experiments only at sintering temperatures below 800 °C; this vitreous nature was preserved in the grown film as well. The presence of Ag and Ce dopants in the parent glassy matrix was validated for all stages, from powder, to target, to PLD/SC-derived coatings. Additionally, it was demonstrated that the surface topography of the layers can be adjusted by using substrates with different roughness or by modulating the processing parameters, such as substrate temperature and working pressure in PLD, rotation speed, and number of layers in SC. The developed material was found to be highly bioactive after 28 days of immersion in SBF, but it was also found to be a potential candidate for inhibiting the growth of Gram-negative bacteria and a suitable support for cell growth and proliferation.

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Ce/Sm/Sr-Incorporating Ceramic Scaffolds Obtained via Sol-Gel Route

Cited by 3 publications

References 51 publications

Processing of Calcium Magnesium Silicates by the Sol–Gel Route

Processing of Calcium Magnesium Silicates by the Sol–Gel Route

Photoluminescence and Energy Transfer in Double- and Triple-Lanthanide-Doped YVO4 Nanoparticles

The Effect of Silver and Samarium on the Properties of Bioglass Coatings Produced by Pulsed Laser Deposition and Spin Coating

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