Premium
Phototaxis of Oil Droplets Comprising a Caged Fatty Acid Tightly Linked to Internal Convection
Author(s) -
Suzuki Kentaro,
Sugawara Tadashi
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600273
Subject(s) - phototaxis , chemistry , photodissociation , irradiation , photochemistry , oleic acid , chemical physics , biochemistry , botany , physics , nuclear physics , biology
We found that novel sub‐millimeter‐sized photoactive oil droplets of oleic acid bearing a photolabile protecting group, 2‐nitrobenzyl oleate (NBO), in basic water exhibited unidirectional motion toward a UV light source. This unidirectional motion can be explained by anisotropic photolysis on a surface of the NBO droplet with low permeability for UV light. Time‐dependent changes of the movement under UV irradiation occurred in a cascade manner (still‐standing, induction, and active stages). The velocity of the UV‐irradiated droplet in the induction stage was small, but it was accelerated sixteen times by the presence of an inner convection structure, which was created by continued photolysis. This characteristic dynamics, which is derived from a supramolecular machinery system towards the external stimulus, may be similar to the phototaxis of a living cell.