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Issue 47, 2016
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From evaporation-induced self-assembly to shear-induced alignment

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Abstract

The functionality of compact nanostructured thin films depends critically on the degree of order and hence on the underlying ordering mechanisms during film formation. For dip coating of rigid nanorods the counteracting mechanisms, evaporation-induced self-assembly (EISA) and shear-induced alignment (SIA) have recently been identified as competing ordering mechanisms. Here, we show how to achieve highly ordered and homogeneous thin films by controlling EISA and SIA in dip coating. Therefore we identify the influences of the process parameters including temperature, initial volume fraction and nanorod aspect ratio on evaporation-induced convective flow and externally applied shear forces and evaluate the resulting films. The impact of evaporation and shear can be distinguished by analysing film thickness, surface order and bulk order by careful in situ SAXS, Raman and SEM-based image analysis. For the first time we derive processing guidelines for the controlled application of EISA and SIA towards highly ordered thin nematic films.

Graphical abstract: From evaporation-induced self-assembly to shear-induced alignment

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Article information


Submitted
19 Aug 2016
Accepted
06 Nov 2016
First published
08 Nov 2016

Nanoscale, 2016,8, 19882-19893
Article type
Paper

From evaporation-induced self-assembly to shear-induced alignment

R. Srikantharajah, T. Schindler, I. Landwehr, S. Romeis, T. Unruh and W. Peukert, Nanoscale, 2016, 8, 19882
DOI: 10.1039/C6NR06586D

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