| Abstract
| - The fluorescence spectrum of dye molecules, 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyron (DCM), dissolved in surfactant-free n-decane droplets (average diameters of ∼300 and ∼2000 nm)dispersed in water was measured by a confocal microscope. The fluorescence spectra for 300- and 2000-nmdroplets are found to exhibit a peak at 640 and 625 nm, respectively, and the peak red shifts with a decreasein the droplet diameter (solvatochromic shift of DCM molecules). It is concluded that (1) DCM moleculesare located in a polar surface region of n-decane droplets and (2) the polarity increases with decreasing thedroplet diameter.
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