Pathways for the Production of Non-stoichiometric Titanium Oxides

Paunović, Perica; Petrovski, Aleksandar; Nacevski, G; Grozdanov, Anita; Marinkovski, Mirko; Andonovic, Beti; Makreski, Petre; Popovski, Orce; Dimitrov, Aleksandar

doi:10.1007/978-94-017-9697-2_24

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…Furthermore, above this temperature range, the DTA curves still show small peaks. These endothermic or exothermic reactions correspond to the decomposition of CaCO 3 at close to 750 • C [61] (Equation ( 7)), Ti(OH) 4 close to 790 • C [62], or Mg(OH) 2 close to 670 • C [63]. Yet, these compounds exist only at the tracks level.…”

Section: ≡M-oh + Ho-m≡ → ≡M-o-m≡ + H2o (6)mentioning

confidence: 99%

XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

et al. 2020

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In this paper, the effect on thermal behavior and compounds mineralogy of replacing different percentages of fly ash with compact particles was studied. A total of 30% of fly ash was replaced with mass powder glass (PG), 70% with mass natural aggregates (S), and 85% with mass PG and S. According to this study, the obtained fly ash based geopolymer exhibits a 20% mass loss in the 25–300 °C temperature range due to the free or physically bound water removal. However, the mass loss is closely related to the particle percentage. Multiple endothermic peaks exhibit the dihydroxylation of β-FeOOH (goethite) at close to 320 °C, the Ca(OH)2 (Portlandite) transformation to CaCO3 (calcite) occurs at close to 490 °C, and Al(OH)3 decomposition occurs at close to 570 °C. Moreover, above 600 °C, the curves show only very small peaks which may correspond to Ti or Mg hydroxides decomposition. Also, the X-ray diffraction (XRD) pattern confirms the presence of sodalite after fly ash alkaline activation, whose content highly depends on the compact particles percentage. These results highlight the thermal stability of geopolymers in the 25–1000 °C temperature range through the use of thermogravimetric analysis, differential thermal analysis, and XRD.

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Section: ≡M-oh + Ho-m≡ → ≡M-o-m≡ + H2o (6)mentioning

confidence: 99%

XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

et al. 2020

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“…In brookite, the octahedral are connected by both edges and vertices forming an orthorhombic structure (a = 5.436 Å, b = 9.166 Å, c = 5.135 Å). [2][3][4] The most important and crucial property of TiO 2 for the variety of applications lies in its semi conductivity of n-type with 3d 2 4s 2 outer electron distribution. 5 This electronic structure of semiconducting TiO 2 is appropriate for photo catalysis and sensing application.…”

Section: Introductionmentioning

confidence: 99%

Structural changes of TiO2 as a result of CNTs incorporation

Grozdanov¹,

Paunović²,

Makreski³

et al. 2022

MSEIJ

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The subject of this research work was to analyze the structural and morphological changes of TiO2 as a result of incorporation of CNTs and interpret the underlying principles for the observed interactions. Hybrid TiO2/CNTs nanostructures were prepared by simplified sol-gel method followed by monitoring the thermally-induced alterations occurring up to 400 ºC. The effects of different type of CNTs (activated MWCNTs and as prepared SWCNTs) as well as the variation of the content of MWCNTs in association with the metal-dopant (Pt or Co) influencing the structural parameters of TiO2 was monitored. Addition of CNTs and metallic phase causes reduction of TiO2 (anatase) crystallite size. The applied instrumental techniques such as XRPD, Raman spectroscopy and thermal (TG, DTA and DTG) analysis points out on achieved interaction between TiO2 and incorporated CNTs. Morphological changes, observed from the SEM micrographs, revealed better inter-locking of the TiO2 matrix with SWCNTs than with MWCNTs. Formation of a more structurally disordered and non-stoichiometric anatase phase seemed to be a preferred choice for the obtained TiO2-CNT-metalic phase nanocomposites for further utilization in sensor-design products.

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Section: Introductionmentioning

confidence: 99%

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2022

MSEIJ

View full text Add to dashboard Cite

The subject of this research work was to analyze the structural and morphological changes of TiO 2 as a result of incorporation of CNTs and interpret the underlying principles for the observed interactions. Hybrid TiO 2 /CNTs nanostructures were prepared by simplified solgel method followed by monitoring the thermally-induced alterations occurring up to 400 ºC. The effects of different type of CNTs (activated MWCNTs and as prepared SWCNTs) as well as the variation of the content of MWCNTs in association with the metal-dopant (Pt or Co) influencing the structural parameters of TiO 2 was monitored. Addition of CNTs and metallic phase causes reduction of TiO 2 (anatase) crystallite size. The applied instrumental techniques such as XRPD, Raman spectroscopy and thermal (TG, DTA and DTG) analysis points out on achieved interaction between TiO 2 and incorporated CNTs. Morphological changes, observed from the SEM micrographs, revealed better inter-locking of the TiO 2 matrix with SWCNTs than with MWCNTs. Formation of a more structurally disordered and non-stoichiometric anatase phase seemed to be a preferred choice for the obtained TiO 2 -CNT-metalic phase nanocomposites for further utilization in sensor-design products.

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Pathways for the Production of Non-stoichiometric Titanium Oxides

Cited by 4 publications

References 27 publications

XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

Structural changes of TiO2 as a result of CNTs incorporation

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