Details
| Original language | English |
|---|---|
| Pages (from-to) | 452-460 |
| Number of pages | 9 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 466 |
| Publication status | Published - 15 Mar 2016 |
Abstract
Here we focused on the study of the effect of the zinc oxide nano-coatings surface acidity on the surface hydrophilicity and photoinduced hydrophilic conversion. A three-step procedure was used to have the initial state of the ZnO surface free of organics and to control the conditions during the water wetting and the irradiation steps. The kinetics of photoinduced hydrophilic conversions for ZnO films were obtained and demonstrated a dependence on the initial hydrophilic state. No conversion into the superhydrophilic state was observed for ZnO nano-films independently of the surface acidity. Irradiation in the ultraviolet and visible spectral regions showed the existence of "slow" and "fast" processes in the photoinduced hydrophilic conversion of the ZnO surface. A multi-layered model of hydroxyl-hydrated coverage of the surface is proposed to explain the experimental results.
Keywords
- Dip-coating, Hydroxyl-hydrated coverage, Nano-coating, Photoinduced hydrophilic conversion, Sol-gel synthesis, Surface acidity, Surface total energy, Zinc oxide
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- Surfaces, Coatings and Films
- Chemical Engineering(all)
- Colloid and Surface Chemistry
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In: Journal of Colloid and Interface Science, Vol. 466, 15.03.2016, p. 452-460.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photoinduced hydrophilic conversion of hydrated ZnO surfaces
AU - Rudakova, A.V.
AU - Oparicheva, U.G.
AU - Grishina, A.E.
AU - Murashkina, A.A.
AU - Emeline, A.V.
AU - Bahnemann, D.W.
N1 - Funding information: The present study was performed within the Project “Establishment of the Laboratory “Photoactive Nanocomposite Materials” No. 14.Z50.31.0016 supported by a Mega-grant of the Government of the Russian Federation. This work was partially supported by a Grant from the Saint-Petersburg State University for scientific research (11.38.207.2014) and a Grant from the Russian Foundation for Basic Research (12-03-00456-a). We are also grateful to the RC “Nanophotonics”, RC “Nanotechnology”, RC “Chemical Analysis and Materials Research Centre”, RC “X-ray Diffraction Studies”, RC “Optical and Laser Materials Research” of the Research Park at the Saint-Petersburg State University for helpful assistance in conducting the synthesis and the characterization of the samples. A.A.M. thanks the Saint-Petersburg State University for support within the University Postdoctoral program (No. 11.50.1595.2013).
PY - 2016/3/15
Y1 - 2016/3/15
N2 - Here we focused on the study of the effect of the zinc oxide nano-coatings surface acidity on the surface hydrophilicity and photoinduced hydrophilic conversion. A three-step procedure was used to have the initial state of the ZnO surface free of organics and to control the conditions during the water wetting and the irradiation steps. The kinetics of photoinduced hydrophilic conversions for ZnO films were obtained and demonstrated a dependence on the initial hydrophilic state. No conversion into the superhydrophilic state was observed for ZnO nano-films independently of the surface acidity. Irradiation in the ultraviolet and visible spectral regions showed the existence of "slow" and "fast" processes in the photoinduced hydrophilic conversion of the ZnO surface. A multi-layered model of hydroxyl-hydrated coverage of the surface is proposed to explain the experimental results.
AB - Here we focused on the study of the effect of the zinc oxide nano-coatings surface acidity on the surface hydrophilicity and photoinduced hydrophilic conversion. A three-step procedure was used to have the initial state of the ZnO surface free of organics and to control the conditions during the water wetting and the irradiation steps. The kinetics of photoinduced hydrophilic conversions for ZnO films were obtained and demonstrated a dependence on the initial hydrophilic state. No conversion into the superhydrophilic state was observed for ZnO nano-films independently of the surface acidity. Irradiation in the ultraviolet and visible spectral regions showed the existence of "slow" and "fast" processes in the photoinduced hydrophilic conversion of the ZnO surface. A multi-layered model of hydroxyl-hydrated coverage of the surface is proposed to explain the experimental results.
KW - Dip-coating
KW - Hydroxyl-hydrated coverage
KW - Nano-coating
KW - Photoinduced hydrophilic conversion
KW - Sol-gel synthesis
KW - Surface acidity
KW - Surface total energy
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=84954150717&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2015.08.015
DO - 10.1016/j.jcis.2015.08.015
M3 - Article
VL - 466
SP - 452
EP - 460
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
ER -