N-Dodecyl-ethane-1,2-diamine as amphiphilic molecular probes in liquid crystal-based sensors for detecting aluminum ions

doi:10.1016/j.microc.2023.108472

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Title:	N-Dodecyl-ethane-1,2-diamine as amphiphilic molecular probes in liquid crystal-based sensors for detecting aluminum ions
Authors:	Ho, Tsung Yang;Hsu, Chia-Wei;Chen, Chih-Hsin
Keywords:	Liquid crystal;Aluminum ions detection;Amphiphilic molecules
Date:	2023-02-02
Issue Date:	2023-04-28 17:58:28 (UTC+8)
Publisher:	Elsevier
Abstract:	Conventional liquid crystal (LC)-based sensors for detecting metal ions usually apply a molecular probe for target recognition and an amphiphilic molecule for LC alignment, which makes LC-based sensors require additional pre-mixing procedures such that they are not suitable for in-situ monitoring. In this work, we applied an amphiphilic molecule, i.e., N-dodecyl-ethane-1,2-diamine (NN12C) as the molecular probes in LC-based sensors for detecting aluminum ions (Al3+). At the LC/aqueous interface, NN12C is protonated and aligns at the interface to cause the homeotropic orientation of LC. The binding of Al3+ and the amino groups of NN12C changed the amphiphilicity of NN12C and disrupted the orientation of LC, resulting into a dark-to-bright transition of LC images. Based on this mechanism, the lowest detectable concentration of Al3+ was 8 μM with the detection range from 8 to 25 μM. Moreover, we demonstrated that this sensor can detect aluminum ions in drinking water. This work provides a strategy to develop the LC-based sensors to detect metal ions with simplified operating procedures.
Relation:	Microchemical Journal 2023 188, 108472
DOI:	10.1016/j.microc.2023.108472
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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