ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Detection of Molecular Adsorbate in Aqueous Solution Based on Electroosmosis

Toyohiro Naito, Hiroki Inoue, Shunta Futagami, Akihiro Kunisawa, Takuya Kubo, and Koji Otsuka

(Received June 30, 2018; Accepted August 24, 2018)

Keywords: microfluidic device, electroosmotic flow, chemical sensor

We presents a novel chemical sensor based on electroosmotic flow for simple detection of chemical adsorption in aqueous solution. The fundamental investigations for the optimization of a microfabricated electroosmotic pump (EOP) revealed relationships between the applied electric condition and pumping performance of EOPs. The optimized EOP had an improved minimum driving voltage of only 9 V, which could be driven with a portable battery. The EOP after surface modification by molecular imprinting, such as a method with ionic complexes, changes the pumping performance by the adsorption of chemicals on its surface. We also investigated the relationships between the change in the pumping rate and chemical species of adsorbate using quaternary ammonium cations with different alkyl chains. The pump showed a change in pumping performance depending on length of the alkyl chains.

Corresponding author: Toyohiro Naito




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