A study of factors that change the wettability of titania films

Andrew Mills, Matthew Crow

Research output: Contribution to journalArticle

20 Citations (Scopus)
37 Downloads (Pure)

Abstract

The effect of several pretreatment methods on the wettability of polycrystalline titania-coated glass (Pilkington Activ) and plain glass are investigated. UV/ozone, immersion in aqua regia, and heating (T > 500 degrees C) render both substrates superhydrophilic (i.e., water contact angle (CA) < 5 degrees). The dark recovery of the contact angles of these superhydrophilic substrates, monitored after treatment in either an evacuated or an ambient atmosphere, led to marked increases in CA. Ultrasound treatment of superhydrophilic Activ and glass samples produced only small increases in CA for both substrates, but rubbing the samples with a cloth produced much larger increases. The results of this study are discussed in the context of the current debate over the mechanism of the photo-induced superhydrophilic effect.
Original languageEnglish
Article number470670
Number of pages7
JournalInternational Journal of Photoenergy
DOIs
Publication statusPublished - 2008

Fingerprint

wettability
Contact angle
Wetting
titanium
Titanium
Glass
glass
Substrates
Ozone
plains
pretreatment
submerging
ozone
Ultrasonics
recovery
Heating
atmospheres
Recovery
heating
titanium dioxide

Keywords

  • TiO2 thin-films
  • photoinduced superhydrophilicity
  • surface
  • hydrophilicity
  • conversion
  • dioxide
  • photocatalysis
  • hydrocarbons
  • generation

Cite this

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author = "Andrew Mills and Matthew Crow",
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A study of factors that change the wettability of titania films. / Mills, Andrew; Crow, Matthew.

In: International Journal of Photoenergy, 2008.

Research output: Contribution to journalArticle

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AU - Mills, Andrew

AU - Crow, Matthew

PY - 2008

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AB - The effect of several pretreatment methods on the wettability of polycrystalline titania-coated glass (Pilkington Activ) and plain glass are investigated. UV/ozone, immersion in aqua regia, and heating (T > 500 degrees C) render both substrates superhydrophilic (i.e., water contact angle (CA) < 5 degrees). The dark recovery of the contact angles of these superhydrophilic substrates, monitored after treatment in either an evacuated or an ambient atmosphere, led to marked increases in CA. Ultrasound treatment of superhydrophilic Activ and glass samples produced only small increases in CA for both substrates, but rubbing the samples with a cloth produced much larger increases. The results of this study are discussed in the context of the current debate over the mechanism of the photo-induced superhydrophilic effect.

KW - TiO2 thin-films

KW - photoinduced superhydrophilicity

KW - surface

KW - hydrophilicity

KW - conversion

KW - dioxide

KW - photocatalysis

KW - hydrocarbons

KW - generation

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