The structure of multilayered titania nanotubes based on delaminated anatase

Mogilevsky, Gregory; Chen, Qiang; Kleinhammes, Alfred; Wu, Yue

doi:10.1016/j.cplett.2008.06.063

Cited by 58 publications

(48 citation statements)

References 20 publications

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“…As shown in Fig. 1(a), most of the diffraction peaks of TiO 2 nanotubes can be readily indexed to anatase phase of TiO 2 , which is in accordance with the report of Gregory Mogilevsky et al [15,16]. As they reported, the samples were composed of sheets containing a few layers and shared the same intrinsic structure-stacking arrangement perpendicular to the layers and the same order within layers.…”

Section: Characterization Methodssupporting

confidence: 86%

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Zhang

et al. 2011

Powder Technology

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Section: Characterization Methodssupporting

confidence: 86%

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Zhang

et al. 2011

Powder Technology

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“…Nevertheless, the latter was very scarcely considered for simulation on TiO 2 NTs, during the last three years only [14][15][16], while a number of earlier and recent simulations on TiO 2 NTs were limited by triplelayered O-Ti-O structure, with optimization resulted in a hexagonal fluorite-like morphology [17][18][19][20][21]. This is not only due to computational limitations, , insufficient application of formalism of rotohelical symmetry in ab initio calculations, but also due to a presence of 3-layer fragments in structural units of separate walls in MW TiO 2 NTs [8]. As to anatase TiO 2 (001) surface, it was found to be considerably less stable than (101) surface [1].…”

Section: Introductionmentioning

confidence: 93%

“…Two types of morphologies were observed in recently synthesized titania tubular nanostructures: cylindricallike multi-walled (MW) and scroll-like, , containing various types of defects and impurities [3]. Their diameters usually vary from several to tens nm, with interwall distances ∼ 0 5 nm and lengths up to several µm [7,8]. Beyond the synthesis of pure titania nanotubes, a number of studies was performed for titanate nanosystems as possible precursors in the synthesis of TiO 2 NTs after thermal and chemical treatment [10].…”

Section: Introductionmentioning

confidence: 99%

Symmetry and models of single-walled TiO2 nanotubes with rectangular morphology

et al. 2011

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Abstract:The formalism of line symmetry groups for one-periodic (1D) nanostructures with rotohelical symmetry has been applied for symmetry analysis of single-walled titania nanotubes (SW TiO 2 NTs) formed by rolling up the stoichiometric two-periodic (2D) slabs of anatase structure. Either six-or twelve-layer (101) slabs have been cut from TiO 2 crystal in a stable anatase phase. After structural optimization, the latter keeps the centered rectangular symmetry of initial slab slightly compressed along a direction coincided with large sides of elemental rectangles. We have considered two sets of SW TiO 2 NTs with optimized six-and twelve-layer structures, which possess chiralities (− ) and ( ) of anatase nanotubes. To analyze the structural and electronic properties of titania slabs and nanotubes, we have performed their ab initio LCAO calculations, using the hybrid Hartree-Fock/Kohn-Sham exchange-correlation functional PBE0. The band gaps (∆ε ) and strain energies (E ) of six-layer nanotubes have been computed and analyzed as functions of NT diameter (D NT ). As to models of 12-layer SW TiO 2 NTs of both chiralities, their optimization results in structural exfoliation, , the multi-walled structure should be rather formed in nanotubes with such a number of atomic layers.

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“…This living crystal grows because new units are constantly being added to its upper end. A similar structure, but on hierarchically different levels of matter organization, have: cylindrical molecules -inorganic and organic, often chiral nanotubes [1][2][3][4][5], microtubules that are sometimes not only chiral but have changeable number of protofilaments [6], membrane nanotubes in cell-to-cell connections [7], stromules interconnecting plastids and other organelle extensions [8,9].…”

Section: Introductionmentioning

confidence: 99%

The significance of γ-and λ-dislocations in transient states of phyllotaxis: how to get more from less – sometimes!

Zagórska‐Marek

Szpak

2016

Acta Soc Bot Pol

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In some plants, developmental changes of phyllotaxis are so frequent that the whole spectrum of phyllotactic patterns becomes available for investigation and thus many unknown subtleties of phyllotaxis come to light. Among these, Magnolia acuminata is the most prominent. In a series of experiments performed in silico with application of a simple geometric model of phyllotaxis, we were able to confront the empirical data on phyllotactic transitions occurring in magnolia flowers with the results of computer simulations. They revealed that in addition to the ratio between the sizes of plant organs, the history of developing pattern was also important, especially for the direction of ontogenetic changes. The parameters of size tolerance and vertical tolerance in positioning a new element in the first available space, brought the effects of simulations closer to the real patterns. They helped especially to resolve the enigma of multiplication of parastichies (γ-dislocations) observed sometimes during determined growth of magnolia floral axes. We conclude that ontogenetic changes in phyllotaxis result mainly from changing sizes of organs in the course of development and that the changes do not always occur with mathematical accuracy.

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The structure of multilayered titania nanotubes based on delaminated anatase

Cited by 58 publications

References 20 publications

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Symmetry and models of single-walled TiO2 nanotubes with rectangular morphology

The significance of γ-and λ-dislocations in transient states of phyllotaxis: how to get more from less – sometimes!

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