Alkaline hydrothermal kinetics in titanate nanostructure formation

Morgan, Dana L.; Triani, Gerry; Blackford, Mark G.; Raftery, N. A.; Frost, Ray L.; Waclawik, Eric R.

doi:10.1007/s10853-010-5016-0

Cited by 30 publications

(20 citation statements)

References 50 publications

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“…These indicates that both anatase and rutile convert into nanotubes at 120°C, albeit with rutile they are converting at a slower rate. Such observed slower transformation rate of rutile is consistent with the literature [14]. In diffraction patterns for the samples synthesized at t = 24 h and t = 72 h, besides rather sharp precursor peaks, much broader new peaks indicating the presence of tubular layered titanates are noticeable.…”

Section: Resultssupporting

confidence: 91%

“…It is widely accepted that solid nanostructures are generally favored over hollow nanotubes in systems after prolonged reaction time but very often such structures are called nanowires, nanorods as well as nanoribbons. Classification giving guidelines to differentiate similar nanostructures was simultaneously suggested by Bavykin et al [8] and Morgan et al [14]. In both papers, the authors carefully described differences between these structures.…”

Section: Resultsmentioning

confidence: 99%

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Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Baszczuk

Jasiorski

Borak

et al. 2016

Materials Science-Poland

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Different types of titanate one-dimensional nanostructured materials were synthesized and characterized using scanning and transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The results presented in this work unquestionably showed dependence of morphology and structure of the titanate nanopowders on parameters of hydrothermal synthesis. It was found that nanotubes, nanowires and nanoribbons are three unavoidable kinetic products of hydrothermal reaction. Moreover, increasing temperature of reaction or hydrothermal treatment duration results in acceleration of nanotube-nanowire-nanoribbon transformation. However, the sequence of titanate morphology transformation is invariable. The detailed studies further revealed that the crystal structure of hydrothermally prepared nanotubes and nanowires are indistinguishable but the determination of the exact structure is practically impossible. Because of higher crystallinity, the structure of nanoribbons can be established. It was shown that it corresponds to the monoclinic layered trititanic acid H 2 Ti 3 O 7 and is isostructural with sodium derivatives Na 2 − x H x Ti 3 O 7 ·nH 2 O (with x near 2).

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Baszczuk

Jasiorski

Borak

et al. 2016

Materials Science-Poland

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“…This can be related to low crystallinity of synthesized nanoparticles. It is known that the more crystalline precursor, the more 1D growth in hydrothermal process . As P‐70‐400 and P‐70‐500 nanoparticles had crystalline structure, the resulted products after heat treatment (A‐70‐400 and A‐70‐500, respectively) showed 1D structure.…”

Section: Resultsmentioning

confidence: 99%

“…). Because formation of TiO 2 NTs from rutile phase is slower than that of anatase structure . Consequently, the optimum oxidation and heat‐treatment temperatures for production of skein‐like TiO 2 NTs with high open structure and narrow diameter size distribution are 110°C and 400°C, respectively (i.e., A‐110‐400).…”

Section: Resultsmentioning

confidence: 99%

Improved Efficiency of Dye‐Sensitized Solar Cells Based on a Single Layer Deposition of Skein‐Like TiO₂ Nanotubes

2014

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We present a new TiO 2 morphology, featuring high surface area and open structure, synthesized by a two-step chemical route for the manufacture of dye-sensitized solar cells (DSSCs). This construct is sets of intertwined one-dimensional (1D) nanostructures (i.e., nanotubes), so-called skein-like nanotubes (NTs). Such morphology is produced by a combination of TiC oxidation and hydrothermal processes. The mesoporous TiO 2 nanoparticles, as the product of TiC oxidation operation, is used as the precursor of hydrothermal process to grow the skein-like NTs. The effect of processing parameters of TiC oxidation and hydrothermal processes is studied. The skein-like morphology enables to eliminate the conventional three or fourfold layer deposition process by a single layer deposition of TiO 2 NTs. The novel TiO 2 morphology enhances photon capture of fabricated DSSC by exerting a triple function mechanism including improvement of light scattering, dye sensitization, and electron transport. The presented strategy demonstrates the feasibility of the new concept for improvement of cell efficiency by effective light management.

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“…Afterwards, it was heated at 150 o C in a Teflon-lined autoclave. A treatment time of at least 24 h was considered to be sufficient for the dissolution of the starting TiO 2 powder [10]. The white product was filtered and washed with 1N HCl and DI Water.…”

Section: Methodsmentioning

confidence: 99%

Effects of TiO2 NTs% on Polyethersulfone/TiO2 NTs Membranes

Shaban¹,

Hamdy²,

Abdallah³

et al. 2015

JMSE-A

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Abstract:In this work, PES (polyethersulfone)/TiO 2 nanotubes membranes were fabricated by a simple and cheap method. The TiO 2 NTs (titanium dioxide nanotubes) are prepared by the hydrothermal method, the tubes had a narrow size distribution with an average inner diameter of 3-5 nm and outer diameter of 10-13 nm. TiO 2 NTs blended PES membranes are prepared by phase inversion method with different nanotubes percentage (0.18%-0.85%). The morphology of PES membrane was obviously affected by the addition of TiO 2 NTs. The prepared membranes were applied on a vacuum desalination system and the desalination results showed that the salt rejection % and permeate flux of the membrane are enhanced through the addition of TiO 2 NTs. The membrane with higher (0.85%) TiO 2 NTs content resulted in a decrease of salt rejection % because of the defective membrane structure.

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Alkaline hydrothermal kinetics in titanate nanostructure formation

Cited by 30 publications

References 50 publications

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Improved Efficiency of Dye‐Sensitized Solar Cells Based on a Single Layer Deposition of Skein‐Like TiO₂ Nanotubes

Effects of TiO2 NTs% on Polyethersulfone/TiO2 NTs Membranes

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Alkaline hydrothermal kinetics in titanate nanostructure formation

Cited by 30 publications

References 50 publications

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

Improved Efficiency of Dye‐Sensitized Solar Cells Based on a Single Layer Deposition of Skein‐Like TiO2 Nanotubes

Effects of TiO2 NTs% on Polyethersulfone/TiO2 NTs Membranes

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Improved Efficiency of Dye‐Sensitized Solar Cells Based on a Single Layer Deposition of Skein‐Like TiO₂ Nanotubes