Transparent TiO<sub>2</sub> nanotubes on zirconia for biomedical applications

Patel, Sweetu; Baker, Natalie; Marques, Isabella da Silva Viera; Hamlekhan, Azhang; Mathew, Mathew T.; Takoudis, Christos G.; Friedrich, Craig R.; Sukotjo, Cortino; Shokuhfar, Tolou

doi:10.1039/c7ra03940a

Cited by 31 publications

(19 citation statements)

References 55 publications

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“…Bands at around 542 cm −1 , 767 cm −1 and 875 cm −1 were due to Zr–O–Zr vibrations of ZrO 4 structural units observed in the spectra. [ 10,15–18 ] All these bands were suppressed following an increase in La concentration in the composition. A similar trend was observed with the band at 1420 cm −1 , which was assigned to CaZrO 3.…”

Section: Resultsmentioning

confidence: 99%

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

et al. 2020

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In the present study, CaZrO3 nanophosphors were sensitized with lanthanum (La) at different concentrations (0.5, 1.0, 1.5, 2.0, and 2.5) prepared using polyvinyl alcohol as the chelating agent through the sol–gel method. To study their structural and optical properties, samples were characterized by X‐ray diffractometry (XRD), field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM) and photoluminescence (PL). The XRD results revealed that samples were well crystallized and average crystallite sizes were calculated. The average crystallite size value was in good agreement with the value obtained from TEM analysis. Energy dispersive spectroscopy and FE‐SEM confirmed the existence of La in the prepared samples. In the PL spectra, La‐sensitized samples exhibited three bands at 402 nm, 438 nm, and 463 nm in the visible range when excited at the 260 nm wavelength. As the proportion of La increased, the intensity of bands at 438 nm and 463 nm decreased, whereas the band at 402 nm remained stable. Time‐resolved PL spectra illustrated the lifetime of the samples. Corresponding CIE co‐ordinates for La‐sensitized CaZrO3 were calculated.

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Section: Resultsmentioning

confidence: 99%

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

et al. 2020

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“…Both samples exhibited characteristic Ti O and Ti O Ti peaks at 980 and 820 cm -1 . 43 Nevertheless, several changes in the FTIR peaks were observed after silanization. The OH and H O H peaks of anodized TiO 2 disappeared due to the reaction with silane group and transformation into a hydrophobic surface.…”

Section: Fabrication Of Surface Modified Titania Nanotubes Templatementioning

confidence: 99%

Patterning of worm‐like soft polydimethylsiloxane structures using a TiO₂ nanotubular array

Harito

Lledo

Bavykin

et al. 2020

J of Applied Polymer Sci

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Patterned polydimethylsiloxane (PDMS) is an important structure for soft lithography. Various materials have been deployed as mold for patterning PDMS. Anodized nanotubular array has been sought after as cost‐effective alternative for textured silicon. An array of TiO2 nanotubes with characteristic diameter ≈140 nm and the length of ≈1.5 microns, created by anodic oxidation of a titanium substrate, was used here as a template for soft PDMS molding. The optimal molding process was developed by a combination of silanization, use of solvent, application of a vacuum, and hydraulic pressing. The silanization was confirmed by Fourier transform infrared spectroscopy and contact angle measurements while the PDMS structure was examined by scanning electron microscope and energy dispersive X‐ray spectroscopy. Hydraulic pressing significantly improved the infiltration of PDMS into the pores of nanotubular array resulting in formation of PDMS nanobumps after separation of the polymer from the template. Complete infiltration of PDMS precursor into the cavity of nanotubes was observed on the hydraulic‐pressed sample without toluene impurities. The hydraulic‐pressed samples exhibited higher adhesion strength than nonpressed ones. The adhesive strength was measured by a simple experimental arrangement, in which the PDMS layer was stuck on a vertical glass surface followed by pulling it downwards.

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“…The BET adsorption-desorption isotherms of zirconia obtained using a) NaOH and b) NH3 as hydrolysis promoter are located at 3413 cm -1 and 3367 cm -1 for the sample obtained with the use of NaOH and ammonia, respectively. The bands located between 1367 and 1353 cm -1 are assigned to the stretching vibrations of the Zr-OH moieties (Liu et al, 2008;Sarkar et al, 2007;Simmons, 1992;Toullec et al, 1988), while the bands with a maximum in the range of 815-793 cm -1 are derived from the stretching vibrations of Zr-O (Patel et al, 2017). The FT-IR spectra of the tested systems differ only in intensity -in both samples, signals from the Zr-O and Zr-OH groups were recorded, as well as a signal from the O-H binding.…”

Section: Comparison Of Physicochemical Properties Of Zro2 Obtained Usmentioning

confidence: 99%

Synthesis of vanadium-enriched oxide materials via modified sol-gel route with the use of waste solutions contaminated with vanadium ions

Weidner¹,

Piasecki²,

Siwińska-Ciesielczyk³

et al. 2020

Physicochem. Probl. Miner. Process.

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In this study, the synthesis of zirconia as well as zirconia enriched with vanadium by modified sol-gel method was presented. The modification of the method was based on the replacement of the traditional basic promoter of hydrolysis, which is ammonia, with sodium hydroxide solution. The most favorable conditions for the synthesis of zirconium with a new hydrolysis promoter were selected. A comparative analysis of ZrO2 obtained using various hydrolysis promoters was performed. Both materials exhibited almost the same physicochemical properties, which proves that in this case the nature of the hydrolysis promoter used in sol-gel route does not significantly affect the properties of the ZrO2. Then, synthesis of ZrO2/V systems was carried out using model and real solutions containing vanadium ions as hydrolysis promoters. The solutions formed after vanadium catalyst leaching were used as real solutions. The effect of vanadium concentration and the presence of impurities on the final physicochemical properties of the obtained hybrid materials were investigated via scanning electron microscopy (SEM), dynamic light scattering (DLS), energy-dispersive X-ray microanalysis (EDS), Fourier transform infrared spectroscopy (FT-IR), low-temperature nitrogen sorption (BET), thermogravimetric analysis (TGA). The analysis of the obtained results allows to state that the developed technique for the synthesis of ZrO2 and ZrO2/V systems, using a modified sol-gel method, enabled the production of attractive materials.

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Transparent TiO₂ nanotubes on zirconia for biomedical applications

Cited by 31 publications

References 55 publications

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

Patterning of worm‐like soft polydimethylsiloxane structures using a TiO₂ nanotubular array

Synthesis of vanadium-enriched oxide materials via modified sol-gel route with the use of waste solutions contaminated with vanadium ions

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Transparent TiO2 nanotubes on zirconia for biomedical applications

Cited by 31 publications

References 55 publications

Investigation of lanthanum‐sensitized CaZrO3 blue nanophosphors for white light‐emitting diode applications

Investigation of lanthanum‐sensitized CaZrO3 blue nanophosphors for white light‐emitting diode applications

Patterning of worm‐like soft polydimethylsiloxane structures using a TiO2 nanotubular array

Synthesis of vanadium-enriched oxide materials via modified sol-gel route with the use of waste solutions contaminated with vanadium ions

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Product

Resources

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Transparent TiO₂ nanotubes on zirconia for biomedical applications

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

Patterning of worm‐like soft polydimethylsiloxane structures using a TiO₂ nanotubular array