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Open AccessFeature PaperArticle

Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions

Department of Industrial Chemistry, Tokyo University of Science, Tokyo 162-0825, Japan
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Colloids Interfaces 2018, 2(4), 47; https://doi.org/10.3390/colloids2040047
Received: 29 September 2018 / Revised: 11 October 2018 / Accepted: 11 October 2018 / Published: 13 October 2018
In our previous paper, we reported that thermo-responsive emulsions can be prepared based on a long-chain amidoamine derivative (C18AA) and tetraoctylammonium bromide (TOAB), and that the C18AA + TOAB emulsions developed a characteristic interference color in a narrow temperature range. However, the coloration of the original C18AA + TOAB at room temperature exhibited poor brightness. In the present study, we show that the addition of NaOH is effective in both lowering the coloration temperature and improving the brightness of C18AA + TOAB emulsion considerably. Furthermore, we demonstrate that photo-response function can be imparted to C18AA + TOAB iridescent emulsions by introducing a photochromic naphthopyran derivative (Pyran) that reversibly changes from white to yellow upon UV irradiation. The C18AA + TOAB emulsions containing Pyran shows a dual stimuli-responsive iridescent property, and the emulsion color is controllable and reversible through both UV irradiation and temperature. View Full-Text
Keywords: coloring temperature; iridescent emulsions; thermo-response; photo-response coloring temperature; iridescent emulsions; thermo-response; photo-response
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Kondo, R.; Imura, Y.; Wang, K.-H.; Kawai, T. Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions. Colloids Interfaces 2018, 2, 47.

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