Bio-Inspired Titanium Dioxide Materials with Special Wettability and Their Applications

Liu, Kesong; Cao, Moyuan; Fujishima, Akira; Jiang, Lei

doi:10.1021/cr4006796

Cited by 505 publications

(322 citation statements)

References 621 publications

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“…Brookite nanomaterials were found to perform better than other polymorphs in various photocatalytic reactions (e.g., CO 2 photoreduction [86,103], photoreforming of oxygenates [21,82], ammonia oxidation [92]), and showed promising properties for future applications also in other fields, such as photoelectrochemical devices [66], dye-sensitized solar cells (DSSC) [104,105], bio-applications and self-cleaning materials [106,107]. The days in which brookite was considered just an undesirable byproduct are long gone, it is now time to dig deeper and find out even more about this and other less familiar TiO 2 polymorphs.…”

Section: Discussionmentioning

confidence: 99%

Brookite: Nothing New under the Sun?

2017

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Advances in the synthesis of pure brookite and brookite-based TiO 2 materials have opened the way to fundamental and applicative studies of the once least known TiO 2 polymorph. Brookite is now recognized as an active phase, in some cases showing enhanced performance with respect to anatase, rutile or their mixture. The peculiar structure of brookite determines its distinct electronic properties, such as band gap, charge-carrier lifetime and mobility, trapping sites, surface energetics, surface atom arrangements and adsorption sites. Understanding the relationship between these properties and the photocatalytic performances of brookite compared to other TiO 2 polymorphs is still a formidable challenge, because of the interplay of many factors contributing to the observed efficiency of a given photocatalyst. Here, the most recent advances in brookite TiO 2 material synthesis and applications are summarized, focusing on structure/activity relation studies of phase and morphology-controlled materials. Many questions remain unanswered regarding brookite, but one answer is clear: Is it still worth studying such a hard-to-synthesize, elusive TiO 2 polymorph? Yes.

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Section: Discussionmentioning

confidence: 99%

Brookite: Nothing New under the Sun?

2017

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“…Therefore, they have practical applications as a key component for the fabrication of piezoelectric transducers, transparent conductive oxides, sensors, light-emitting diodes, and optoelectronic devices. In recent years, there has been increasing interest in the wettability of oxide semiconductors as smart materials [16][17][18][19][20][21][22]. Among the large family of oxide semiconductors, TiO 2 , with the direct band gap energy of 3.55-3.75 eV, has been widely used in photocatalysts, hydrogen generation, gas sensing, solar cells, and so on [23][24][25].…”

Section: mentioning

confidence: 99%

Effect of surface morphology on wettability conversion

Kong

Wang

et al. 2016

J Adv Ceram

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Abstract:A hierarchical structural surface of TiO 2 film with reversibly light-switchable wettability between superhydrophobicity and superhydrophilicity on metal substrate was fabricated through simply dip-coating method from TiO 2 precursor solution containing TiO 2 nanoparticles with the average diameter 25 nm (P25), followed by heat-treatment and modification with fluoroalkylsilane (FAS) molecules. The morphology, phase and crystallographic structure, and chemical composite of the as-prepared TiO 2 film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The wettability of TiO 2 film was characterized by a drop shape analyzer. The water contact angle of superhydrophobic TiO 2 film was up to 165.6°. Under UV irradiation, the water contact angle decreased and the superhydrophobic TiO 2 film became superhydrophilic because of hydroxyl groups absorption on the TiO 2 surface. Meanwhile, the surface morphology of TiO 2 film, which resulted from the TiO 2 nanoparticles added in TiO 2 precursor solution, had a significant effect on the wettability conversion of TiO 2 film and enhanced the switch from hydrophobicity to hydrophilicity. The wettability could be reversibly switched between superhydrophobicity and superhydrophilicity via alternation of UV exposure and dark storage.

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“…Due to numerous applications, various materials have been the center of researchers' attention (Andrews et al, 2013). Those are materials used in house furniture and glasses, or out of the house like solar panels in roof (Liu et al, 2014a). Surfaces coated with self-cleaning material can be cleaned by rain, for example, even though waxy substances such as insect bodies or leave parts may cling unto the surface (Fillion et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Self-Cleaning Materials with Different Suitable Applications

Chermahini¹,

Ostad‐Ali‐Askari²,

Eslamian³

et al. 2018

American Journal of Engineering and Applied Sciences

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Self-cleaning properties have received significant attention for the importance of their potential. Coatings at Nano-scales offer possibilities of using materials for self-cleaning surfaces. Recent efforts have begun to focus on the kinds of materials including metals, semiconductors and polymers. Such materials can have enormous potential in only a few applications. Moreover, the production of these materials requires high costs with low photo activity. In this regard, TiO 2 and its derived materials have shown acceptable and effective suggestions for this application. Moreover, the mechanism of self-cleaning has been explained by the effect of hydrophilic and hydrophobic. Hydrophilic and hydrophobic can have many applications in different areas like water purification, microfluidics and photovoltaic. In this review, the application of self-cleaning in solar cells and environment as well as TiO 2 derived materials and their applications in water management have been briefly illustrated. In addition, it has been explained that a huge number of self-cleaning materials, applications and improvement in utilities have been essential. In short, we have conducted a comprehensive review of the new approach and to mention numerous materials with hydrophobic and hydrophilic properties would be promising for most environmental concerns. Bio-inspired surface respond in nature through hydrophobic (Cicada Wing, Butterfly Wing, Lotus Leaf, Rice Leaf) and hydrophilic (Fish Scale, Snail Shell, Shark Skin) properties was divided in 4 and 3 respectively. Anti reflective coatings with self-cleaning properties have drowned considerable attention for both their basic appearances and vast applied usages. Antireflective coatings with self-cleaning properties have been considered because of their fascinating features and vast diversity of empirical uses.

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Bio-Inspired Titanium Dioxide Materials with Special Wettability and Their Applications

Cited by 505 publications

References 621 publications

Brookite: Nothing New under the Sun?

Brookite: Nothing New under the Sun?

Effect of surface morphology on wettability conversion

Recent Progress in Self-Cleaning Materials with Different Suitable Applications

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