Nobukazu KANAI

Influence of water and ion permeability by additive for the purpose of reducing of coloration time of Dye nanoparticle coated test strips

Yukiko TAKAHASHI

The Dye nanoparticle-coated test strips (DNTSs) was developed for water analysis with high sensitivity to trace ions. The DNTS has high sensitivity, however it takes from 30 minutes to several hours for ion detection to saturate the color intensity.The reason was inferred from highly hydrophobic of dye nanoparticle layer, and hydrophobic is emphasized by rough surface.
In this study, the detection time was reduced by the Bathophenanthroline DNTS as a model. At first, a cause of late reaction time was elucidated by comparing kinetics of solution, nanoparticle and DNTS.
The kinetics does not change the nanoparticles and solution state, the step of the solution to penetrate the nano thin layer structure had been found to be rate-limiting.
Secondly addition agent was investigated the effect on the penetration of water and ions into the DNTS. PVA including water-soluble polymer or urea including low molecular wetting reagent were used as an addition agent. They were used when making nanoparticle. Also, it was investigated the effects of the surfactant contained in the membrane filter.
As a result, Surfactant contained in the membrane filter had the effect of dissolving the nanoparticles. At the same time, the water content of the nano thin film revealed that greatly affect the color strength.
In contrast, polyvinyl alcohol, urea reduced penetration time of DNTS without dissolving the particles and nano thin structure. Thereby, DNTS was reduced coloration time.These materials act as a humectant, it has been found that it is reformed by keeping the moisture content of the nano thin layer.Additionally, these materials did not affect the detection sensitivity.The addition of A, effect on the penetration time by polymerization degree has changed

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