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In this work we address a novel feature of spreading dynamics of tiny liquiddroplets on solid surfaces, namely the case where the ends of the moleculesfeel different interactions to the surface. We consider a simple model ofdimers and short chain--like molecules which cannot form chemical bonds withthe surface. We study the spreading dynamics by Molecular Dynamics techniques.In particular, we examine the microscopic structure of the time--dependentprecursor film and find that in some cases it can exhibit a high degree oflocal order. This order persists even for flexible chains. Our results suggestthe possibility of extracting information about molecular interactions from thestructure of the precursor film.

Molecular ordering of precursor films during spreading of tiny liquid droplets