Chiral‐Symmetry Selection in Soft Monolayers under Vortical Flow |
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Authors: | Núria Petit‐Garrido Dr Josep Claret Dr Jordi Ignés‐Mullol Dr Joan Anton Farrera Prof Dr Francesc Sagués |
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Institution: | 1. Departament de Química Física, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Martí i Franqués 1, 08028 Barcelona, Catalunya (Spain), Fax: (+34)?93‐402‐12‐31;2. Department de Química Orgànica, Universitat de Barcelona, Martí i Franqués 1, 08028 Barcelona, Catalunya (Spain) |
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Abstract: | Herein, we report and interpret a new chiral‐selection phenomenon in the orientational ordering of soft‐assembled domains that arise spontaneously in Langmuir monolayers of an azobenzene derivative at the air/water interface. The orientational chirality of isolated sub‐millimeter domains was unambiguously assessed by optical microscopy. The selection process, quantified by using an enantiomeric excess parameter, was controlled by stirring the aqueous subphase. We have studied the dependence of this process on stirring rate and handedness, stirring time, temperature, and on the initial state of the monolayer. The influence of the concomitant cis/trans isomerization on the reported chiral‐selection process is also discussed. |
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Keywords: | azo compounds mesophases monolayers stirring effects surfactants |
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