Effect Of Calcination Temperatures On Structures Of Tio2 Powders Prepared By Hydrothermal Method Using Thai Leucoxene Mineral

Aphairaj, Deaw; Wirunmongkol, Thanakorn; Pavasupree, Sorapong; Limsuwan, Pichet

doi:10.1016/j.egypro.2011.09.062

Cited by 25 publications

(9 citation statements)

References 21 publications

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“…Additionally, the patterns corresponding to these nanoparticles show the typical peaks belonging to trigonal Se(0) crystals [36] with the main peaks at 2θ values of 24 • , 29.7 • , 42.4 • , 43.7 • and 48.8 • corresponding to the crystal planes (100), (101), (110), (102) and (111), respectively, being clearly visible only in the sample calcinated at 800 • C. For the SeTi400 and SeTi600, the shoulder at 2θ = 24 • indicates that amorphous nanoselenium particles [37] can convert into trigonal Se phase by phase transition influenced by the temperature of hydrothermal reaction. In the low-degree region, at 2θ = 11.5 • and 14 • , the pattern of reduced titanate is also visible [38].…”

Section: Characterization Of Se-doped Tio 2 Particlesmentioning

confidence: 92%

“…For the SeTi400 and SeTi600, the shoulder at 2θ = 24° indicates that amorphous nanoselenium particles [37] can convert into trigonal Se phase by phase transition influenced by the temperature of hydrothermal reaction. In the low-degree region, at 2θ = 11.5° and 14°, the pattern of reduced titanate is also visible [38].…”

Section: Characterization Of Se-doped Tio 2 Particlesmentioning

confidence: 93%

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Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

et al. 2020

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The properties of poly(vinyl alcohol) (PVA)-based composites recommend this material as a good candidate for the replacement of damaged cartilage, subchondral bone, meniscus, humeral joint and other orthopedic applications. The manufacturing process can be manipulated to generate the desired biomechanical properties. However, the main shortcomings of PVA hydrogels are related to poor strength and bioactivity. To overcome this situation, reinforcing elements are added to the PVA matrix. The aim of our work was to develop and characterize a novel composition based on PVA reinforced with Se-doped TiO2 nanoparticles and natural hydroxyapatite (HA), for possible orthopedic applications. The PVA/Se-doped TiO2 composites with and without HA were structurally investigated by FTIR and XRD, in order to confirm the incorporation of the inorganic phase in the polymeric structure, and by SEM and XRF, to evidence the ultrastructural details and dispersion of nanoparticles in the PVA matrix. Both the mechanical and structural properties of the composites demonstrated a synergic reinforcing effect of HA and Se-doped TiO2 nanoparticles. Moreover, the tailorable properties of the composites were proved by the viability and differentiation potential of the bone marrow mesenchymal stem cells (BMMSC) to osteogenic, chondrogenic and adipogenic lineages. The novel hybrid PVA composites show suitable structural, mechanical and biological features to be considered as a promising biomaterial for articular cartilage and subchondral bone repair.

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Section: Characterization Of Se-doped Tio 2 Particlesmentioning

confidence: 92%

Section: Characterization Of Se-doped Tio 2 Particlesmentioning

confidence: 93%

Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

et al. 2020

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“…The 2θ values and related XRD planes corresponded well to the standard anatase and rutile JCPDS cards and reported literature. 37,38 Phromma et al also reported a higher rutile phase than the anatase after calcination of sol−gel synthesized TiO 2 nanoparticles at 700 °C. 39 The CNF showed a more intensive peak at ∼25.5°2θ, which represents the carbon (002) diffraction plane.…”

Section: Resultsmentioning

confidence: 96%

Construction of Functionalized Carbon Nanofiber–g-C₃N₄ and TiO₂ Spheres as a Nanostructured Hybrid Electrode for High-Performance Supercapacitors

2021

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To meet the demand for the development of high energy storage devices, appropriate designs of advanced carbon nanostructures (CNs) with metal oxides are highly preferred. Herein, the surfaces of two advanced carbon nanostructures (CNs), g-C3N4 and carbon nanofibers, were modified by the addition of carboxyl functional groups and then bound to TiO2 nanospheres (TNS). The surface functionalization of CNs is an efficient approach for improving the performance of carbon-based supercapacitors by solving the dispersion problems. Field emission scanning electron microscopy and transmission electron microscopy images demonstrated the sheet, fiber, and sphere morphologies of g-C3N4, carbon, and TiO2, respectively. According to the results of Fourier transform infrared spectroscopy, the carboxyl functional groups with CNs were confirmed. In a three-electrode system, the supercapacitance of fictitious electrodes was evaluated with a 4 M KOH electrolyte. The surface-functionalized hybrid electrode showed a specific capacitance (817 F g–1) at a current density of 0.25 A g–1 superior to those of the other fictitious electrodes. The electrode showed stability for up to 2000 cycles, with 89.2% capacitance retention. The superior electrochemical properties of CNs–TNS were attributed to the synergetic effects of g-C3N4–CNF/TiO2 composition and its excellent accessibility, conductivity, surface functionalization, and strong chemical interface. This study positively encourages the manufacture and design of carbon nanostructure based metal oxide nanostructures for high-performance supercapacitor applications.

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“…As an example, the high reactivity of TiO 2 , considered as a reference model for the photocatalytic heterogeneous process, is attributed to the combination between the synergistic effect of the anatase and rutile phases (80 % anatase and 20 % rutile) and its large surface area . Herewith, the performance of a semiconductor could be improved through the crystalline alteration of the structure by modifications on the composition phase through calcination temperature of the materials . Alongside these strategies to improve the catalytic activity the design and/or use of low‐cost composites to make this an economically feasible technique has been implemented.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature on the Photocatalytic Activity of Nanostructures Synthesized by Hydrothermal Method from Black Mineral Sand

2020

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A nanostructured material from black sand, whose structure is composed by Fe2O3 and TiO2 oxides, was prepared via hydrothermal treatment (at 120 °C for 72 h), The starting mineral (as‐synthesized nanostructure) was characterized by XRF spectroscopy and thermogravimetric analysis (TGA/DTA) whereas the calcined nanostructures were analyzed by scanning electron microscopy/EDX, BET single point measurements, X‐ray diffraction, FTIR spectroscopy, and UV‐Vis spectrophotometry. The effect of thermal treatment on structural, morphological and redox properties of nanostructured samples (NS) have been thoroughly studied in the samples calcined at 400, 700 and 1000 °C, together with a non‐treated sample (M1). Their photocatalytic activity toward hydrogen production in the presence of EDTA as sacrificial agent has been tested. The as‐synthetized samples calcined at 1000 °C (NS‐1000) showed a higher photocatalytic activity for hydrogen production, possibly due to the transformation of magnetite into more active photocatalytical phases (hematite) driven by the changes in surface morphology (such as reduction of crystallite and pore size reduction) according to thermal equilibrium of its phases. The highest activity for photocatalytic hydrogen production was achieved by the materials calcined at 1000 °C (M1‐1000 and NS‐1000), while the sample calcined at lower values (<700 °C) were the least active. The catalyst activity was assigned to the appearance of a new active phase (α‐Fe2O3), which improves the electronic mobility during the photocatalytic mechanism.

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Effect Of Calcination Temperatures On Structures Of Tio2 Powders Prepared By Hydrothermal Method Using Thai Leucoxene Mineral

Cited by 25 publications

References 21 publications

Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

Construction of Functionalized Carbon Nanofiber–g-C₃N₄ and TiO₂ Spheres as a Nanostructured Hybrid Electrode for High-Performance Supercapacitors

Effect of Calcination Temperature on the Photocatalytic Activity of Nanostructures Synthesized by Hydrothermal Method from Black Mineral Sand

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Effect Of Calcination Temperatures On Structures Of Tio2 Powders Prepared By Hydrothermal Method Using Thai Leucoxene Mineral

Cited by 25 publications

References 21 publications

Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

Novel Hybrid Composites Based on PVA/SeTiO2 Nanoparticles and Natural Hydroxyapatite for Orthopedic Applications: Correlations between Structural, Morphological and Biocompatibility Properties

Construction of Functionalized Carbon Nanofiber–g-C3N4 and TiO2 Spheres as a Nanostructured Hybrid Electrode for High-Performance Supercapacitors

Effect of Calcination Temperature on the Photocatalytic Activity of Nanostructures Synthesized by Hydrothermal Method from Black Mineral Sand

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Construction of Functionalized Carbon Nanofiber–g-C₃N₄ and TiO₂ Spheres as a Nanostructured Hybrid Electrode for High-Performance Supercapacitors