Review of Water-Assisted Crystallization for TiO2 Nanotubes

Wang, Xiaoyi; Zhang, Dainan; Xiang, Quanjun; Zhong, Zhiyong; Liao, Yulong

doi:10.1007/s40820-018-0230-4

Cited by 34 publications

(18 citation statements)

References 162 publications

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“…In the literature, the crystallization of TiO 2 from the amorphous phase is described as a result of high-temperature annealing (Ref 26). As regards low-temperature alternatives, some other sources reported that it is possible to induce crystallization at room temperature with water or steam (Ref [22][23][24][25]. According to the knowledge of authors, crystallization of brookite as a result of moisture or condensed water has not been shown so far-all found reports describe crystallization of anatase.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Activity Enhancement of Low-pressure Cold-Sprayed TiO2 Coatings Induced by Long-term Water Vapor Exposure

et al. 2021

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This work shows that the titanium dioxide coatings obtained by low-pressure cold gas spraying with the use of the sol–gel amorphous TiO2 powder are characterized by photocatalytic activity despite their partial amorphous content. Moreover, the research outcome suggests that the decomposition rate of organic pollutants is enhanced after long-term exposure to moisture. The condensation humidity test is not detrimental to the continuity and integrity of the coating, but the phase composition of coatings changes—with the exposure to water vapor, the portion of the amorphous phase crystallizes into brookite. The mechanism responsible for the conversion of amorphous TiO2 into brookite is attributed to the water-driven dissolution and reprecipitation of TiO6 octahedra. It has been shown that an additional parameter necessary for the stabilization of the brookite is the oxygen depletion of the amorphous structure of titanium dioxide. Considering the results presented in this paper and the advantages of a portable, low-pressure cold spray system for industrial applications, it is expected that TiO2 coatings produced from a sol–gel feedstock powder can be further developed and tested as efficient photocatalysts.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Activity Enhancement of Low-pressure Cold-Sprayed TiO2 Coatings Induced by Long-term Water Vapor Exposure

et al. 2021

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“…In particular, aligned NTs have been extensively reported in the literature for PEC water splitting applications. [42,[124][125][126] Table 1 provides some of the conventional techniques for the growth of NAs; however, in the case of TiO 2 NAs, electrochemical anodization techniques are used extensively. This fabrication method effectively controls NTs orientation and morphology.…”

Section: Titania (Tio 2 )-Based Aligned Nasmentioning

confidence: 99%

Quasi‐1D Aligned Nanostructures for Solar‐Driven Water Splitting Applications: Challenges, Promises, and Perspectives

et al. 2021

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Solar energy conversion is considered to be one of the promising alternatives to fossil fuels. The photoelectrochemical (PEC) water splitting into hydrogen and oxygen is a prominent approach to utilize solar energy to produce clean hydrogen energy. In PEC water splitting, semiconductors play a central role for absorbing the solar radiations in the UV‐visible region and generating electron‐hole pairs that contribute to water splitting. This review provides an extensive overview of the 1D aligned nanoarrays (1D‐NAs) and their architectures as photoactive materials. 1D‐NAs can be in the form of nanorods (NRs), nanowires (NWs), nanopencils, and nanotubes (NTs), etc. The initial part of the review is dedicated to the synthesis and characterizations of the 1D‐NAs, which is followed by useful synthetic protocols explicitly employed for the synthesis of NAs morphologies and the mechanisms involved in PEC water splitting. The final section of the review provides examples of highly anticipated TiO2, ZnO, BiVO4‐based, and other miscellaneous aligned NAs utilized for PEC water splitting. The PEC water splitting performance of aligned NAs is compared with other morphologies in terms of photocurrent densities. In this review, it is attempted to provide an account of state‐of‐the‐art stable, novel, and low‐cost aligned photoactive materials for PEC water splitting.

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“…The controlled filling of nanotubes with drug-loaded polymeric micelles can generally slow down the release rate [163]. Drug reservoirs composed of TiO 2 nanorods, nanofibers, and nanotubes also exhibit a sustained drug release for dermal drug delivery applications [164][165][166].…”

Section: Therapeutic Deliverymentioning

confidence: 99%

Insights into Theranostic Properties of Titanium Dioxide for Nanomedicine

Kafshgari

Goldmann

2020

Nano-Micro Lett.

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HIGHLIGHTS • Multifunctional TiO 2 nanostructures hold promise for advancing a wide range of biomedical applications due to a feasible integration of distinct theranostic features. • Fabrication and post-fabrication strategies implemented to generate multifunctional TiO 2 nanostructures for a broad range of biomedical applications are briefly outlined. The opportunities and challenges of TiO 2 nanomaterials are highlighted in order to open the possibility of clinical translation. ABSTRACT Titanium dioxide (TiO 2 ) nanostructures exhibit a broad range of theranostic properties that make them attractive for biomedical applications. TiO 2 nanostructures promise to improve current theranostic strategies by leveraging the enhanced quantum confinement, thermal conversion, specific surface area, and surface activity. This review highlights certain important aspects of fabrication strategies, which are employed to generate multifunctional TiO 2 nanostructures, while outlining post-fabrication techniques with anemphasis on their suitability for nanomedicine. The biodistribution, toxicity, biocompatibility, cellular adhesion, and endocytosis of these nanostructures, when exposed to biological microenvironments, are examined in regard to their geometry, size, and surface chemistry. The final section focuses on recent biomedical applications of TiO 2 nanostructures, specifically evaluating therapeutic delivery, photodynamic and sonodynamic therapy, bioimaging, biosensing, tissue regeneration, as well as chronic wound healing.

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Review of Water-Assisted Crystallization for TiO2 Nanotubes

Cited by 34 publications

References 162 publications

Photocatalytic Activity Enhancement of Low-pressure Cold-Sprayed TiO2 Coatings Induced by Long-term Water Vapor Exposure

Photocatalytic Activity Enhancement of Low-pressure Cold-Sprayed TiO2 Coatings Induced by Long-term Water Vapor Exposure

Quasi‐1D Aligned Nanostructures for Solar‐Driven Water Splitting Applications: Challenges, Promises, and Perspectives

Insights into Theranostic Properties of Titanium Dioxide for Nanomedicine

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