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Issue 11, 2018
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Readily available titania nanostructuring routines based on mobility and polarity controlled phase separation of an amphiphilic diblock copolymer

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Abstract

The amphiphilic diblock copolymer polystyrene-block-polyethylene oxide is combined with sol–gel chemistry to control the structure formation of blade-coated foam-like titania thin films. The influence of evaporation time before immersion into a poor solvent bath and polarity of the poor solvent bath are studied. Resulting morphological changes are quantified by scanning electron microscopy (SEM) and grazing incidence small angle X-ray scattering (GISAXS) measurements. SEM images surface structures while GISAXS accesses inner film structures. Due to the correlation of evaporation time and mobility of the polymer template during the phase separation process, a decrease in the distances of neighboring titania nanostructures from 50 nm to 22 nm is achieved. Furthermore, through an increase of polarity of an immersion bath the energetic incompatibility of the hydrophobic block and the solvent can be enhanced, leading to an increase of titania nanostructure distances from 35 nm to 55 nm. Thus, a simple approach is presented to control titania nanostructure in foam-like films prepared via blade coating, which enables an easy upscaling of film preparation.

Graphical abstract: Readily available titania nanostructuring routines based on mobility and polarity controlled phase separation of an amphiphilic diblock copolymer

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Publication details

The article was received on 21 Dec 2017, accepted on 22 Feb 2018 and first published on 23 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR09519H
Citation: Nanoscale, 2018,10, 5325-5334
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    Readily available titania nanostructuring routines based on mobility and polarity controlled phase separation of an amphiphilic diblock copolymer

    N. Hohn, S. J. Schlosser, L. Bießmann, S. Grott, S. Xia, K. Wang, M. Schwartzkopf, S. V. Roth and P. Müller-Buschbaum, Nanoscale, 2018, 10, 5325
    DOI: 10.1039/C7NR09519H

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