The performance of hybrid titania/silica-derived xerogels as active antifouling/fouling-release surfaces against the marine alga Ulva linza: in situ generation of hypohalous acids

Mixed titania/silica xerogels were prepared using titanium tetraisopropoxide (TTIP) and tetraethoxy orthosilicate (TEOS). Xerogel properties were modified by incorporating n-octyltriethoxysilane (C8). The xerogels catalyze the oxidation of bromide and chloride with hydrogen peroxide (H 2 O 2 ) to pr...

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Bibliographic Details
Published in:Biofouling (Chur, Switzerland) Switzerland), 2016-09, Vol.32 (8), p.883-896
Main Authors: Damon, Corey A., Gatley, Caitlyn M., Beres, Joshua J., Finlay, John A., Franco, Sofia C., Clare, Anthony S., Detty, Michael R.
Format: Article
Language:English
Subjects:
Antifouling
Biofouling - prevention & control
Catalysis
Chlorides
Contact angle
Fouling
Gels - chemistry
Halogenation
hydrogen peroxide
Hydrogen Peroxide - chemistry
Marine biofouling
Organometallic Compounds - chemistry
Oxidation-Reduction
Photoelectron Spectroscopy
Silanes - chemistry
Surface Properties
Titanium
Titanium dioxide
titanium oxide
Ulva
Ulva - growth & development
Ulva linza
Xerogels
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Summary:Mixed titania/silica xerogels were prepared using titanium tetraisopropoxide (TTIP) and tetraethoxy orthosilicate (TEOS). Xerogel properties were modified by incorporating n-octyltriethoxysilane (C8). The xerogels catalyze the oxidation of bromide and chloride with hydrogen peroxide (H 2 O 2 ) to produce hypohalous acids at pH 7 and pH 8. The antifouling/ fouling-release performance of a TTIP/C8/TEOS xerogel in the presence and absence of H 2 O 2 was evaluated for the settlement of zoospores of the marine alga Ulva linza and for the removal of sporelings (young plants). In the absence of H 2 O 2 , differences in the settlement of zoospores and removal of sporelings were not significant relative to a titanium-free C8/TEOS xerogel. Addition of H 2 O 2 gave a significant reduction in zoospore settlement and sporeling removal relative to the C8/TEOS xerogel and relative to peroxide-free conditions. The impact of TTIP on xerogel characteristics was evaluated by comprehensive contact angle analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy.
ISSN:0892-7014
1029-2454
DOI:10.1080/08927014.2016.1203420