Optimizing Hydrophobicity and Photocatalytic Activity of PDMS-Coated Titanium Dioxide | Zendy

Jie Liu | Zendy; Lijun Ye | Zendy; Sanghyuk Wooh | Zendy; Michael Kappl | Zendy; W. Steffen | Zendy; HansJürgen Butt | Zendy

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Optimizing Hydrophobicity and Photocatalytic Activity of PDMS-Coated Titanium Dioxide

Author(s) -

Jie Liu,

Lijun Ye,

Sanghyuk Wooh,

Michael Kappl,

W. Steffen,

HansJürgen Butt

Publication year - 2019

Publication title -

acs applied materials and interfaces

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.535

H-Index - 228

eISSN - 1944-8252

pISSN - 1944-8244

DOI - 10.1021/acsami.9b07490

Subject(s) - polydimethylsiloxane , materials science , wetting , photocatalysis , contact angle , titanium dioxide , layer (electronics) , oxide , chemical engineering , polymer , titanium oxide , hysteresis , metal , composite material , organic chemistry , catalysis , chemistry , physics , quantum mechanics , engineering , metallurgy

Polydimethylsiloxane (PDMS) can be linked to the surface of metal-oxide photocatalysts by immersion and UV illumination. The surfaces become hydrophobic and keep their hydrophobicity even under extended UV exposure. Titanium dioxide (TiO 2 ) is a prominent example of a metal-oxide photocatalyst. Here, we studied the influence of a grafted PDMS layer on the photocatalytic activity and wetting properties of TiO 2 . By varying the molecular weight of PDMS, we controlled the thickness of the polymer layer from 0.6 to 5.5 nm. We recommend a PDMS molecular weight of 6.0 kDa. It leads to a grafted PDMS layer thickness of 2.2 nm, a receding contact angle of 94°, a low contact angle hysteresis of 9°, and the layer is still photocatalytically active.

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