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Colloids and Interfaces
Volume 2
Issue 4
10.3390/colloids2040047
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Article

Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions

by
Ryoichi Kondo
,
Yoshiro Imura
,
Ke-Hsuan Wang
and
Takeshi Kawai
*
Department of Industrial Chemistry, Tokyo University of Science, Tokyo 162-0825, Japan
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2018, 2(4), 47; https://doi.org/10.3390/colloids2040047
Submission received: 29 September 2018 / Revised: 11 October 2018 / Accepted: 11 October 2018 / Published: 13 October 2018
(This article belongs to the Special Issue Selected Papers from the 16th Conference of the International Association of Colloid and Interface Scientists (IACIS 2018))
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Abstract

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.
Keywords: coloring temperature; iridescent emulsions; thermo-response; photo-response coloring temperature; iridescent emulsions; thermo-response; photo-response

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MDPI and ACS Style

Kondo, R.; Imura, Y.; Wang, K.-H.; Kawai, T. Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions. Colloids Interfaces 2018, 2, 47. https://doi.org/10.3390/colloids2040047

AMA Style

Kondo R, Imura Y, Wang K-H, Kawai T. Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions. Colloids and Interfaces. 2018; 2(4):47. https://doi.org/10.3390/colloids2040047

Chicago/Turabian Style

Kondo, Ryoichi, Yoshiro Imura, Ke-Hsuan Wang, and Takeshi Kawai. 2018. "Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions" Colloids and Interfaces 2, no. 4: 47. https://doi.org/10.3390/colloids2040047

APA Style

Kondo, R., Imura, Y., Wang, K.-H., & Kawai, T. (2018). Imparting Photo-responsive Function to Thermo-responsive Iridescent Emulsions. Colloids and Interfaces, 2(4), 47. https://doi.org/10.3390/colloids2040047

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