Optical properties and radiation stability of TiO 2 powders modified by Al 2 O 3 , ZrO 2 , SiO 2 , TiO 2 , ZnO, and MgO nanoparticles

Михайлов, М. М.; Vlasov, V. A.; Yuryev, S.A.; Нещименко, В. В.; Щербина, Валентина Викторовна

doi:10.1016/j.dyepig.2015.07.024

Cited by 41 publications

(9 citation statements)

References 18 publications

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“…Ce 0.7 PO 4 phase, which accelerate the increasing intracellular calcium ions (ubiquitous intracellular messenger) by Figure 4. The relationship between microhardness and (a) the porosity, (b) the density, (c) the relative density, and (d) the average grain size of sintered samples activation of Ca 2+ receptor found in the membranes up-regulating signaling pathways speeding up the adhesion and proliferation of osteoblasts, as reported Ref [36]. As stated in Table 2 that HA-0.5CeO 2 composites include β-TCP phase at amount of 8.0% in addition to HA peaks.…”

mentioning

confidence: 59%

“…Ce 0.7 PO 4 phase, which accelerate the increasing intracellular calcium ions (ubiquitous intracellular messenger) by activation of Ca 2+ receptor found in the membranes up-regulating signaling pathways speeding up the adhesion and proliferation of osteoblasts, as reported Ref [36]. As stated in…”

mentioning

confidence: 66%

“…3 -The difference in the ionic radii of the additives. The ionic radii of the Si is 0.40 Å[35], Zr 4+ is 0.84 Å[36]. SiO2 composites decreased to the minimum value of 18.2% at 1200 o C[33], whereas it decreased to the minimum value of 57.0% for HA composited with ZrO2[34].…”

mentioning

confidence: 90%

“…3-The difference in the ionic radii of the additives. The ionic radii of the Si is 0.40 Å[35], Zr 4+ is 0.84 Å[36].…”

mentioning

confidence: 99%

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Hidroksiapatit / seryum oksit kompozitleri: Sinterleme, mikroyapısal, mekanik ve invitro biyoaktivite özellikleri

Pazarlıoğlu

2019

International Journal of Advances in Engineering and Pure Sciences

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In the present study, the effects of cerium oxide (CeO 2) additive on the sinterability, microstructural, mechanical and in-vitro bioactivity properties of a commercially synthetic hydroxyapatite (HA) was investigated. HA without CeO 2 additive started to decompose at 1100 o C, but the decomposition temperature of the CeO 2 added samples decreased up to 900 o C. Decomposition rate of the sintered samples increased by increasing sintering temperature. It was about 5.8% for pure HA, and increased to 11.4% when the CeO 2 additive to HA reached to 2.5 wt%. SEM images showed that an excessive grain growth as well as microcracks occured on the surface of pure HA when it was sintered at the temperatures than that of 1100 o C. The microcracks were also observed on the surface of HA-CeO 2 composites, when they were sintered at 1300 o C. The composite of HA-0.5CeO 2 sintered at 1100 o C possess the higher fracture toughness (Kıc) (2.510 ± 0.225 MPam-1/2) and the higher compressive strength (152.73 ± 6.31 MPa) compared to other HA-CeO 2 composites, and its mechanical properties are higher than that of pure HA at about 2-3 times. In-vitro bioactivity test results showed that apatite layers on the surface of the samples were in the different morphologies.

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mentioning

confidence: 59%

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confidence: 66%

mentioning

confidence: 90%

“…3-The difference in the ionic radii of the additives. The ionic radii of the Si is 0.40 Å[35], Zr 4+ is 0.84 Å[36].…”

mentioning

confidence: 99%

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Hidroksiapatit / seryum oksit kompozitleri: Sinterleme, mikroyapısal, mekanik ve invitro biyoaktivite özellikleri

Pazarlıoğlu

2019

International Journal of Advances in Engineering and Pure Sciences

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“…The rutile titanium dioxide pigment (mÀ240) was used for investigation of an influence of nanoparticle type of various oxide compounds on diffuse reflection spectra of modified TiO 2 powder and their changes after accelerated electron irradiation [25]. The average grain size of Modification effects on r λ spectra are shown in Figure 4.…”

Section: Reflection Spectra Of Modified Powdersmentioning

confidence: 99%

Investigation of Optical Properties and Radiation Stability of TiO2 Powders before and after Modification by Nanopowders of Various Oxides

Михайлов¹,

Нещименко²,

Yuryev³

et al. 2018

Titanium Dioxide - Material for a Sustainable Environment

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The titanium dioxide powders are widely used as a pigment for coatings and paints, the important characteristics of which are reflectivity and stability to irradiation. The results of investigations of the optical properties and radiation stability of titanium dioxide powders before and after high-temperature modification with nanopowders are presented in this chapter. The diffuse reflection spectra of various titanium dioxide powders in the UV, visible, and near-IR ranges, and their change during irradiation by electrons with 30 keV energy and a different fluence in vacuum in situ were investigated: (1) TiO 2 powders with particle size in the range 60-240 nm; (2) Microsized TiO 2 powder (240 nm) modified by Al 2 O 3 ,ZrO 2 ,SiO 2 , TiO 2 , ZnO, MgO nanoparticles with grain size from 30 up to 60 nm; (3) Microsized TiO 2 powder (260 nm) modified by SiO 2 with the grain size of 12-14 nm at the temperature of 150, 400, and 800 C. The reduction in reflectivity in entire spectrum with decrease in grain sizes of TiO 2 nanopowders was established. Nanopowder with the grain size of 80 nm possesses the highest stability to irradiation. It was shown that the average grain size and specific surface of introduced nanoparticles effect noticeably on the radiation stability increase of titanium dioxide powders modified with nanoparticles of various oxides. The micro-sized TiO 2 powder heating at temperature of 800 о С is the factor which positively influences on the radiation stability.

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The effects of modification by Gd2O3 nanoparticles on optical properties and radiation resistance of CaSiO3 powders

Mikhailov,

Lapin,

Yuryev

et al. 2024

J Mater Sci

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Optical properties and radiation stability of TiO 2 powders modified by Al 2 O 3 , ZrO 2 , SiO 2 , TiO 2 , ZnO, and MgO nanoparticles

Cited by 41 publications

References 18 publications

Hidroksiapatit / seryum oksit kompozitleri: Sinterleme, mikroyapısal, mekanik ve invitro biyoaktivite özellikleri

Hidroksiapatit / seryum oksit kompozitleri: Sinterleme, mikroyapısal, mekanik ve invitro biyoaktivite özellikleri

Investigation of Optical Properties and Radiation Stability of TiO2 Powders before and after Modification by Nanopowders of Various Oxides

The effects of modification by Gd2O3 nanoparticles on optical properties and radiation resistance of CaSiO3 powders

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