Investigation of electrochemical degradation and application of e-paper dyes in organic solvents

doi:10.1007/s11705-009-0062-3

Front Chem Eng Chin

2009, Vol. 3

Issue (2) : 182-185 https://doi.org/10.1007/s11705-009-0062-3

RESEARCH ARTICLE

Investigation of electrochemical degradation and application of e-paper dyes in organic solvents

Luhai LI(

), Ming WANG, Yi FANG, Shunan QIAO

Beijing Institute of Graphic Communication; Beijing Major Laboratory of Printing & Packaging Materials and Technology, Beijing 102600, China

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Abstract

To avoid environmental pollution due to organic dye solutions, the electrophoresis and degradation of dye in organic solvents such as alcohol were investigated. Many dyes were tested in the Indium tin oxide (ITO) electrode driving cell, and about 15 dyes moved under voltage driving. Both the curves of ultraviolet-visible (UV-Vis) and infrared (IR) spectra of the electrophoresis samples showed that the metal complexes Red 04 and Acid Black 1 were degradable in alcohol solution by electrochemical reaction. The cyclic volt-ampere curves of the samples from the electrochemical working station proved that electrochemical reactions took place. Based on the analysis of UV-Vis and IR spectra, the electrochemical degradation products of azo and metal complex azo dyes at lower voltage driving (1-5 V) in organic solvents are oxidized azobenzene, not hydrazine, which was found in the electrochemical degradation of dye water solutions. When the ITO electrode is modified by a polyimide (PI) film to a thickness less than 4 μm, the electrochemical degradation of the dye in alcohol solution will not appear in the cyclic volt-ampere curves. A dye electrophoresis in organic solution flexible prototype e-paper display was formed and the display picture is shown.

Keywords electrochemical degradation electrophoresis e-paper oxidized azobenzene group

Corresponding Author(s): LI Luhai,Email:liluhai@bigc.edu.cn

Issue Date: 05 June 2009

Cite this article:

Luhai LI,Ming WANG,Yi FANG, et al. Investigation of electrochemical degradation and application of e-paper dyes in organic solvents[J]. Front Chem Eng Chin, 2009, 3(2): 182-185.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0062-3
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I2/182

Fig.1 UV-Vis Spectra of Red 04 under different driving voltages

Fig.2 IR curves of Red 04 before (lower) and after (upper) electrophoresis

Tab.1 IR frequency wave number of some groups

Fig.3 IR curves of AB1 before (lower) and after (upper) electrophoresis

Fig.4 Structure of Acid Black 1

Fig.5 Structure of Red 04 　　

Fig.6 Cyclic volt-ampere curves of Red 04 in ethanol (before electrode was protected by PI)

Fig.7 Cyclic volt-ampere curves of Red 04 in ethanol (after electrode was protected by PI)

Tab.2 Electrophoresis condition of some dyes in organic solvent

Fig.8 Flexible prototype e-paper display

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3	Li L H, Wang M, Li Y Y. A Study on protected ITO electrode for e-paper. Asia Display 2007, March, 1688-1692
4	Yu L, Jian P L. Acta Scientiarun Naturalium Universities Sunyatseni, 1997, l36(2): 131-132 (in Chinese)

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