Investigation on the film-coating mechanism of alumina-coated rutile TiO 2 and its dispersion stability

Dong, Xiongbo; Sun, Zhiming; Jiang, Lei; Li, Chunquan; Zheng, Shuilin

doi:10.1016/j.apt.2017.05.001

Cited by 22 publications

(14 citation statements)

References 18 publications

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“…The alumina and alumina‐coated rutile TiO 2 samples were synthesized by the chemical liquid deposition method under various pH values and aging temperatures . Aluminum sulfate solution was added dropwise into the beaker and maintained at different pH by adding sodium hydroxide solution simultaneously.…”

Section: Fabrication Of Superhydrophobic Surfacementioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

110

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decades, researchers have shown great interests in bionics, which was a new multidisciplinary subject inspired by biological characteristics and features to imitate it to build technology devices. [1] With the rise of biomimetic biomaterial researches, a lot of attention was paid on the observation of living organism, especially on plant leaves, such as lotus, rice, taro leaves, etc. [2] As the development of scanning electron microscope (SEM), a wealth of data dealing with SEM of plant surface has been published since 1960s. [3] The cuticular structure was investigated with regard to function, and substances that were secreted onto the cuticle had great effects on the surface properties, while intracuticular waxes were the main barrier to wettability. [4] Some kinds of special wettability like superhydrophobicity and superhydrophilicity were also found in other surfaces, such as self-cleaning lotus leaf, [5] hydrophilicity of red rose petals, [6,7] the anisotropic dewetting behavior on rice leaf, [8,9] hydrophobicity of shark skin, [10] gecko toe, [11] insect wings, [12] etc., and striking superhydrophobic force provided by a water strider's legs, [13] and they were all related to the unique microstructures on their surface. In fact, the special wettability of surfaces is attributed to the interaction of both the surface microstructures and surface covers. As the development and progress of the observation device, smaller nanosized structures were found on the microstructure, and better properties of multiscale hierarchical structure was shown then. [14] Wetting is a phenomenon that solid interface was transferred from solid-gas interface to solid-liquid interface, wettability was a kind of ability that a liquid could be unfolded on one solid surface. The wettability of surface could be characterized by contact angle (CA) of interface. Sliding angle (SA) and contact angle hysteresis were introduced to evaluate the highly valued superhydrophobicity and superhydrophilicity of surfaces. Superhydrophilicity was defied as that of CA was smaller than 5°, superhydrophobicity was defied as that of CA was greater than 150°, as well as a really small sliding angle. It is worth noting that many researchers applied themselves to excavate the theories under the phenomena. Young's equation, Wenzel equation, and Cassie-Baxter equation [15,16] were the representations of hundreds years of research results. Improving and developing Surfaces of plants and animals are evolved to optimal states to accommodate environments better after billions of years of natural selection. As the development of further study on bionics, surfaces with special wetting properties in nature are discovered, extremely related to the micro-/nanostructures on surface. The wetting models and wetting mechanism of several surfaces in nature are investigated, followed by lifting the veil of superhydrophobic field. Various facile, effective, and convenient methods for fabricating superhydrophobic surfaces are obtained and optimized in scientific research and ...

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Section: Fabrication Of Superhydrophobic Surfacementioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

110

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“…The peaks and their intense shake‐up satellites are typical for divalent high spin cobalt . The Ti 2p core level spectra of TiO 2 nanocrystals showed peaks at 458.11 and 464.74 eV, which were assigned to Ti 2p 3/2 and Ti 2p 1/2 , respectively (Figure C), confirming the state of Ti as Ti 4+ in the TiO 2 structure. With respect to the XPS spectra of O 1s of the complex pigments, an asymmetric shape peak at around 531 eV was observed in Figure D.…”

Section: Resultsmentioning

confidence: 65%

“…And, the peak could be deconvoluted into 3 components at 529.36, 531.37, and 533.29 eV. Among them, the peaks at 529.36 and 531.37 eV were assigned to O 1s in rutile TiO 2 and spinel CoAl 2 O 4 , respectively, whereas the peak at 533.29 eV was attributed to surface chemisorbed oxygen. Therefore, the TiO 2 @CoAl 2 O 4 complex pigments calcined at 1100°C were merely consisted of TiO 2 and CoAl 2 O 4 phase.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and color properties of the TiO₂@CoAl₂O₄ blue pigments with low cobalt content applied in ceramic glaze

Wang

Liu

et al. 2018

J Am Ceram Soc

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The TiO2@CoAl2O4 complex blue pigments with low cobalt content were synthesized through calcinations of the precursor obtained from coprecipitating Co2+ and Al3+ to form Co‐Al LDHs (layered double hydroxides) on the surface of TiO2 particles. The structure and the properties of the synthesized pigments were characterized by XRD, SEM, TEM, UV‐Vis spectroscopy, XPS, and colorimeter. The precursors of the blue TiO2@CoAl2O4 complex pigments were consisted of LDHs shell layer encapsulated TiO2 microsphere. After calcinations at 1100°C, the LDHs shell layer were absolutely transformed to the spinel CoAl2O4, and the pigments presented a core‐shell structure and uniform sphere morphology (the diameter of microsphere was about 780 nm). The absorption bands at around 547, 584, and 624 nm in the Uv‐Vis absorption spectra of the TiO2@CoAl2O4 complex pigments were corresponded to the characteristic absorption bands of the spinel CoAl2O4, revealed the pigments with a bright blue hue. In addition, as the mass ratio of CoAl2O4/TiO2 increased to 0.4, the blue component of the pigments reached to 27.89 and slight color variation with the increase in the CoAl2O4 content in a range, possessed low cobalt content and exhibited a stabile performance in commercial low‐temperature ceramic glazes. The XGT results showed that the TiO2@CoAl2O4 complex pigments with low cobalt content presented bright color in ceramic glaze. Especially, the synthesized pigments reduced the usage and toxicity of cobalt, which were efficiency for economy and environmental protection.

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“…A roughening of the coated TiO 2 surfaces resulting from the different morphology ATO coating deposition is evidenced as shown in Figs. 2 c – h [17]. Moreover, the ATO particles on the surface of the TiO 2 /ZrO 2 composite show an agglomerate structure when compared with that of the naked TiO 2 particles.…”

Section: Resultsmentioning

confidence: 99%

Controllable synthesis of TiO ₂ /ATO conductive composite: effects of TiO ₂ surface properties

Qian

Tang

et al. 2018

Micro & Nano Letters

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The effect of the TiO 2 surface property on the conductivity of TiO 2 /antimony-doped tin oxide (ATO) has been revealed by the substrate modification with SiO 2 and ZrO 2. Their morphology, structural, and electric characteristics were investigated through field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical impedance spectra. The surface character of the raw and modified TiO 2 particles in water was investigated. The results indicated that the negatively charged substrate (−29.7 mV) was formed through the incorporation of SiO 2 coating, which facilitated the uniform deposition of positively charged ATO precursors further significantly improved the conductivity of TiO 2 /ATO composite. Conversely, the conductivity of TiO 2 /ZrO 2-ATO composite decreased due to the increase of electrostatic repulsion from the positively charged surface (+55.3 mV) of the substrate. The results confirmed the feasibility of the method proposed in this work.

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Investigation on the film-coating mechanism of alumina-coated rutile TiO 2 and its dispersion stability

Cited by 22 publications

References 18 publications

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Synthesis and color properties of the TiO₂@CoAl₂O₄ blue pigments with low cobalt content applied in ceramic glaze

Controllable synthesis of TiO ₂ /ATO conductive composite: effects of TiO ₂ surface properties

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Investigation on the film-coating mechanism of alumina-coated rutile TiO 2 and its dispersion stability

Cited by 22 publications

References 18 publications

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Synthesis and color properties of the TiO2@CoAl2O4 blue pigments with low cobalt content applied in ceramic glaze

Controllable synthesis of TiO 2 /ATO conductive composite: effects of TiO 2 surface properties

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Synthesis and color properties of the TiO₂@CoAl₂O₄ blue pigments with low cobalt content applied in ceramic glaze

Controllable synthesis of TiO ₂ /ATO conductive composite: effects of TiO ₂ surface properties