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Superspreading is the phenomenon where a drop of trisiloxane surfactant solution rapidly spreads on a moderately hydrophobic substrate over a very large area. However the mechanism of superspreading is unknown to date. In this work Reflection Anisotropy Spectroscopy (RAS) is used for the first time in order to investigate the causes of superspreading. An aqueous solution of the superspreader Evonik S240 (0.1%) is compared with the chemically similar but non superspreading solution of Evonik S233 (0.1%), on a polycarbonate (pcp) substrate. This study is aimed at finding evidence of organised structures, such as micelles, at the contact line of the receding film which could be part of the mechanism of superspreading. The RA signal is monitored as the solutions recede from vertically aligned pcp substrates. The results are then analysed for evidence of anisotropy on the surface arising from any micelle structures located at the contact line of the film.

Experimental investigation of a flowing superspreader solution using Reflection Anisotropy Spectroscopy