title: Two-dimensional domain shape transitions in photosensitive monolayer assemblies.
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.
mesh_terms: D001578:Benzopyrans / Q000737:chemistry / Q000528:radiation effects; D004537:Eicosanoic Acids / Q000737:chemistry / Q000528:radiation effects; D004582:Electronics, Medical; D005740:Gases; D006863:Hydrogen-Ion Concentration; D007211:Indoles; D008027:Light; D008856:Microscopy, Fluorescence; D009574:Nitro Compounds; D010777:Photochemistry; D011166:Porphyrins / Q000737:chemistry / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D001578:Benzopyrans; D004537:Eicosanoic Acids; D005740:Gases; D007211:Indoles; D009574:Nitro Compounds; D011166:Porphyrins; C088184:spiropyran; C094477:arachidic acid