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High hiding power and weather durability of film-coated titanium dioxide particles with a yolk-shell structure.

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Title: High hiding power and weather durability of film-coated titanium dioxide particles with a yolk-shell structure.
Authors: Liang, Yong1, Yu, Keyi1, Xie, Jiuren1, Zheng, Qinzhong1, Wang, Ting-Jie1 wangtj@tsinghua.edu.cn
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. May2017, Vol. 520, p736-742. 7p.
Subjects: Titanium dioxide, Structural shells, Povidone, Durability, Metallic films, Surface coatings
Abstract: High hiding power and weather durability are the key characteristic indices of the high-performance pigmentary titanium dioxide (TiO 2 ). The film-coated TiO 2 particles with a yolk-shell structure of silica were prepared by surface-protected etching with polyvinyl pyrrolidone. The hiding power of the TiO 2 particles with the yolk-shell structure was 90.6, which is significantly higher than the hiding power of 87.7 for the dense film-coated TiO 2 particles with the same amount of coating (20%). However, the TiO 2 particles with the yolk-shell structure have low weather durability. The apparent degradation rate constant K app for rhodamine-B had a high value of 13.2. An improvement was made by coating a dense MgO film on the TiO 2 particles first, and then coating a yolk-shell structure. The hiding power of the TiO 2 particles with the improved yolk-shell structure reached 90.6, and the weather durability was significantly increased as the apparent degradation rate constant K app decreased to 2.2, reaching the excellent weather durability of the TiO 2 particles with 5 wt% dense film coating (Si3 + Al2), which is a common product in industry ( K app = 1.8). For the same indices of hiding power and weather durability, the TiO 2 particles with the improved yolk-shell structure obviously decreased the consumption of TiO 2 , compared with the dense SiO 2 -coated TiO 2 particles (TiO 2 @SiO 2 ). It is inferred that the void in the yolk-shell structure increased the light reflectivity of the TiO 2 particles by increasing the difference of the refractive index between the core TiO 2 and the surroundings, and the dense MgO film increased the weather durability of the TiO 2 particles. [ABSTRACT FROM AUTHOR]
Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 121972365
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: High hiding power and weather durability of film-coated titanium dioxide particles with a yolk-shell structure.
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  Data: <searchLink fieldCode="AR" term="%22Liang%2C+Yong%22">Liang, Yong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yu%2C+Keyi%22">Yu, Keyi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xie%2C+Jiuren%22">Xie, Jiuren</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zheng%2C+Qinzhong%22">Zheng, Qinzhong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Ting-Jie%22">Wang, Ting-Jie</searchLink><relatesTo>1</relatesTo><i> wangtj@tsinghua.edu.cn</i>
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  Data: <searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+shells%22">Structural shells</searchLink><br /><searchLink fieldCode="DE" term="%22Povidone%22">Povidone</searchLink><br /><searchLink fieldCode="DE" term="%22Durability%22">Durability</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+films%22">Metallic films</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+coatings%22">Surface coatings</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: High hiding power and weather durability are the key characteristic indices of the high-performance pigmentary titanium dioxide (TiO 2 ). The film-coated TiO 2 particles with a yolk-shell structure of silica were prepared by surface-protected etching with polyvinyl pyrrolidone. The hiding power of the TiO 2 particles with the yolk-shell structure was 90.6, which is significantly higher than the hiding power of 87.7 for the dense film-coated TiO 2 particles with the same amount of coating (20%). However, the TiO 2 particles with the yolk-shell structure have low weather durability. The apparent degradation rate constant K app for rhodamine-B had a high value of 13.2. An improvement was made by coating a dense MgO film on the TiO 2 particles first, and then coating a yolk-shell structure. The hiding power of the TiO 2 particles with the improved yolk-shell structure reached 90.6, and the weather durability was significantly increased as the apparent degradation rate constant K app decreased to 2.2, reaching the excellent weather durability of the TiO 2 particles with 5 wt% dense film coating (Si3 + Al2), which is a common product in industry ( K app = 1.8). For the same indices of hiding power and weather durability, the TiO 2 particles with the improved yolk-shell structure obviously decreased the consumption of TiO 2 , compared with the dense SiO 2 -coated TiO 2 particles (TiO 2 @SiO 2 ). It is inferred that the void in the yolk-shell structure increased the light reflectivity of the TiO 2 particles by increasing the difference of the refractive index between the core TiO 2 and the surroundings, and the dense MgO film increased the weather durability of the TiO 2 particles. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.colsurfa.2017.02.046
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 736
    Subjects:
      – SubjectFull: Titanium dioxide
        Type: general
      – SubjectFull: Structural shells
        Type: general
      – SubjectFull: Povidone
        Type: general
      – SubjectFull: Durability
        Type: general
      – SubjectFull: Metallic films
        Type: general
      – SubjectFull: Surface coatings
        Type: general
    Titles:
      – TitleFull: High hiding power and weather durability of film-coated titanium dioxide particles with a yolk-shell structure.
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            NameFull: Liang, Yong
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            NameFull: Yu, Keyi
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            NameFull: Xie, Jiuren
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            NameFull: Wang, Ting-Jie
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            – D: 05
              M: 05
              Text: May2017
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              Y: 2017
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              Value: 520
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