In this paper, CdTe quantum dot (QD)@silica nanobeads were used as modulated photoluminescence (PL) sensors for the sensing of ascorbic acid in aqueous solution for the first time. The sensor was developed based on the different quenching effects of Fe(2+) and Fe(3+) on the PL intensity of the CdTe QD@ silica nanobeads. Firstly, the PL intensity of the CdTe QDs was quenched in the presence of F...

We recently demonstrated how various enveloped viruses can be efficiently concentrated using magnetic beads coated with an anionic polymer, poly(methyl vinyl ether-maleic anhydrate). However, the exact mechanism of interaction between the virus particles and anionic beads remains unclear. To further investigate whether these magnetic anionic beads specifically bind to the viral envelope, we exa...

The aim of this one-year project is to develop synthetic methods to form well-defined colloidal assemblies of metal nanoparticles and to understand their unique optical properties focusing on magnetic resonance scattering and surface enhanced Raman scattering (SERS). Our synthetic approach is based on the templated surfactant-assisted seed growth method, where polymer particles decorated with s...

The selective sorting of Pb ions in bloodstream flow has been carried out via mixed chitosan nano-beads aqua-solution and then selectively sponge up the Pb ions by a chelating mechanism. To obtain an efficient chelating reaction and a chelating nanobead that can be attracted and separated from the bloodstream flow, a microfluidic component of a microchannel with electrodes has been designed and...

Virus detection methods based on nonlinear magnetic response of nanoparticles have been investigated, and using the third harmonic are widely applied, owing to their high sensitivity short measurement time. This paper proposes a virus method second because its larger signal component. We found that is superior for small nanobeads large change in signal-to-noise ratio (SNR) with concentration. I...

A fast solid-phase microextraction method using core-shell ZnO-poly (methyl methacrylate) nanobeads (ZnO-PMMA) as adsorbent was established. This fast method with high enriching efficiency and salt tolerance capability depends on the structure of the core-shell nanobeads. First, the large surface area of the PMMA shell makes the dispersive nanobeads capture samples quickly, by virtue of multi-i...