Luminescent and structural properties of Yb3+-doped Al2O3 nanopowders

Jusza, Anna; Anders, Krzysztof; Jastrzębska, Agnieszka; Polis, Paweł; Olszyna, A.; Kuş, Mahmut; Kunicki, A.; Piramidowicz, Ryszard

doi:10.1016/j.optmat.2011.04.015

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…One of the basic tests recommended for assessing cytotoxicity is the MTT assay . Cell viability is measured based on mitochondrial enzyme activity, mainly that of succinate dehydrogenase.…”

Section: Resultsmentioning

confidence: 99%

“…The selection of the Caco‐2 and BJ cells was made due to the potential route of entering nanoparticles into the body, for example, gastrointestinal tract and skin or mucous membranes. L929 cells were added to the study protocol as a reference cell line except that the cytotoxicity test was performed only for TiO 2 ‐Ag and TiO 2 ‐Au materials.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

Rosłon

Jastrzębska

Sitarz

et al. 2018

Int J Applied Ceramic Tech

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The aim of the presented work was to evaluate the effect of modification of titanium dioxide nanoparticles with noble metals and their oxides on selected mammalian cells. The in vitro cytotoxicity studies of titanium dioxide (TiO 2 ) nanoparticles modified with Au, Ag, Pd, Ag 2 O, and PdO with reference to the unmodified TiO 2 nanoparticles were presented. The evaluation of cytotoxic activity of the tested nanocomposite particles was carried out using three cell lines: Caco-2 colorectal epithelial adenocarcinoma cells, BJ normal human skin fibroblasts, and L929 mouse fibroblasts. The in vitro studies included determination of cell viability after 24 and 48 hours of exposure to the nanocomposite particles, using the MTT assay, as well as flow cytometry with Annexin V-FITC staining.Our results indicate that irrespectively of the kind of cell line and assay used, nanoparticles of unmodified titanium dioxide as well as those with addition of gold and palladium have a slight impact on cell viability at the investigated concentration range (10-200 μg/mL). Nanoparticles with addition of silver (Ag and Ag 2 O), were found to have significantly higher toxic effect, the level of which varied depending on the cell line and assay used.

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“…One of the basic tests recommended for assessing cytotoxicity is the MTT assay . Cell viability is measured based on mitochondrial enzyme activity, mainly that of succinate dehydrogenase.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

Rosłon

Jastrzębska

Sitarz

et al. 2018

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…These mentioned measurement methods should be also applicable for GFMs toxicological analyses. Unfortunately, the most important physicochemical parameters of nanomaterials such as morphology, particle and agglomerate average size (Ziemkowska et al 2014), elemental and phase composition, porosity, surface area (Gryczka et al 2014), surface reactivity (Jastrzębska et al 2011a;Jastrzębska et al 2011b;Jastrzębska 2011c;Jusza et al 2011), surface charge measured as zeta potential, dispersion stability and hydrodynamic diameter analysis (Kurtycz et al 2013) are not always determined together with their ecotoxicological behavior. Moreover, we found that the characterization methods in various articles in most cases considerably overshoot (Table 2).…”

Section: Characterization Of Gfms Used For Ecotoxicity Investigationsmentioning

confidence: 99%

The ecotoxicity of graphene family materials: current status, knowledge gaps and future needs

Jastrzębska

Olszyna

2015

J Nanopart Res

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Recently, graphene family materials (GFMs) have been introduced among all fields of science and still get numerous attention. Also, the applicability of these materials in many areas makes them very attractive. GFMs have attracted both academic and industrial interest as they can produce a dramatic improvement in materials properties at very low filler content. The aim of this review is to identify, summarize, and present the first available information on the influence of GFMs on soil and water environment as well as identify the knowledge gaps and indicate the directions for the next generation of the original scientific investigations. The paper also presents our first preliminary impact assessment and potential pathways of GFMs distribution in the environment. We used as an example the reduced graphene oxide/Al 2 O 3 nanocomposite (RGO/Al 2 O 3 ) that has been previously designed and synthesized by us. Authors believe that further work should focus on improvement of characterization methodology applicable for ecotoxicity analyses and possible interactions between GFMs and different living ecosystems. Consequently, the potential impact of graphene and its derivatives on environmental health is a matter of academic interest. However, potential hazards sufficient for risk assessment and concerned with GFMs usage in consumer products first need to be investigated and identified. Further research should focus on gathering knowledge on GFMs properties for life cycle analyses, which still poses a great challenge for scientists.

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“…This is why we have analyzed absorption spectra of Yb 3+doped YAlO 3 50 and Yb 3+ -doped Al 2 O 3 . 51,52 The 0-phonon line of Y 1−x Yb x AlO 3 is positioned at 978.5 nm at much lower energy than the 975 nm of the Yb 3+ -doped nanoceramic and so cannot be retained with a detectable amount in these samples as a coherent conclusion of the temperature sintering at 450 °C explained earlier to avoid formation at least of the YAP phase.…”

Section: ■ Results and Discussionmentioning

confidence: 86%

“…This is why we have analyzed absorption spectra of Yb 3+ -doped YAlO 3 and Yb 3+ -doped Al 2 O 3 . , …”

Section: Resultsmentioning

confidence: 99%

Yb³⁺ Ions Distribution in YAG Nanoceramics Analyzed by Both Optical and TEM-EDX Techniques

et al. 2014

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We show the approach in the structural and spectroscopic analysis of Yb3+-doped YAG nanoceramics prepared using the low temperature-high pressure sintering technique (LTHP) by conjugation of both TEM-EDX and optical techniques. Pressure sintering dependences of absorption, emission, and decays are analyzed and interpreted. The sample pressurized at 8 GPa for sintering is characterized by the highest transparency and confirms the Y3Al5O12 garnet structure of the grains of ∼21 nm average size. Yb3+ ion distribution has been analyzed by both TEM-EDX evaluation in grains and grain boundaries and spectroscopy of Yb3+ pairs of small population from the co-operative luminescence phenomenon. EDX analysis at the TEM scale provides unambiguous results on a clear tendency of almost uniform Yb3+ distribution. An important new observation has been made at 4 K and room temperature with the 2F7/2 → 2F5/2 0-phonon absorption line located at 975.7 nm, in addition of the 0-phonon line of the YAG structure of grains at 968 nm similar to that of bulky YAG single crystals. We have discussed the origin of this new 0-phonon line relaxing only by nonradiative transitions and conclude that this line might be assigned to Yb3+ distorted sites on the grain surfaces.

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Luminescent and structural properties of Yb3+-doped Al2O3 nanopowders

Cited by 9 publications

References 9 publications

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

The ecotoxicity of graphene family materials: current status, knowledge gaps and future needs

Yb³⁺ Ions Distribution in YAG Nanoceramics Analyzed by Both Optical and TEM-EDX Techniques

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Luminescent and structural properties of Yb3+-doped Al2O3 nanopowders

Cited by 9 publications

References 9 publications

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

The ecotoxicity of graphene family materials: current status, knowledge gaps and future needs

Yb3+ Ions Distribution in YAG Nanoceramics Analyzed by Both Optical and TEM-EDX Techniques

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Product

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Yb³⁺ Ions Distribution in YAG Nanoceramics Analyzed by Both Optical and TEM-EDX Techniques