Abstract
Bubble-stripe shape transitions of gaseous domains are observed in Langmuir monolayers of porphyrin/arachidic acid and porphyrin/spiropyran mixtures using fluorescence microscopy. Characteristics of the transition such as critical bubble size are found to be controllable by subphase pH or UV/visible irradiation. These features are discussed in terms of a balance between dipolar repulsions and line tension in the monolayer.
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