Min-Kyeong Yeo

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Triclosan, bisphenol A (BPA) and bisphenol A diglycidyl ether (BADGE) are widely used in cosmetics, cleaners and plastic bowls. However, triclosan has been detected in sewage samples after treatment. Moreover, BPA and BADGE are thought to be endocrine disruptors, and these chemicals bio-accumulate in aquatic living organisms. Human skin and oral tissues are(More)
In this study, we manufactured metal-doped TiO2 nanoparticles using several transition metals (Mn, Fe, Ni, and Cu). Their physicochemical properties were evaluated by transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, and UV-visible spectra. The energy efficiency of the metals increased in the order of Ni-<Cu-<Mn-<Fe-TiO2. For(More)
In this study, we investigated the biological toxicities of two crystalline phases and differential sizes of TiO2 nanoparticles (anatase; 7–8 nm, 12–14 nm, and 17–23 nm, rutile; 80–100 nm, 150–200 nm, and 500 nm) using the zebrafish in an aquatic ecosystem. The zebrafish morphants that survived exposure to the TiO2 nanoparticles exhibited incomplete(More)
We investigated the comparative effects of Cu 15 mol % doped TiO2 (anatase crystal phase, 20 ppt) nanoparticles and pure TiO2 (anatase crystal phase, 20 ppt) nanoparticles on cellular toxicity, penetration, and gene expression in zebrafish embryogenesis. HRTEM analysis observed that pure TiO2 particles were in the form of small balls (<10 nm), while(More)
Nanomaterials composed of silver (Ag), copper-doped titanium dioxide (Cu-TiO2), and pure titanium dioxide (TiO2) have wide applications in consumer products such as cosmetics, electronic appliances, clothes, and industry materials such as solar cell. However, there are problems associated with the exposure of aquatic organisms in the ecosystem to such(More)
Metal-based nanoparticles (NPs) such as silver (Ag) and titanium dioxide (TiO2) are widely used in industrial and household applications. Because of the increasing use of such manufactured NPs and their release into the natural environment, NPs are likely to have a widespread geographic distribution. Concerns over discharge of considerable amounts of these(More)
Nanophase ceramic titanium dioxide (TiO2) is a potential scaffold material for tissue engineering. When scaffolds are used to regenerate injured tissues or organs, potential adverse effects associated with the scaffolding material should be investigated. This study focused on the influx and accumulation of TiO2 nanoparticles (NPs)- and TiO2 nanotubes (NTs)-(More)
paper-based analytical device (μPAD) for in situ rapid colorimetric detection of microorganisms in environmental water samples. We fabricated the μPAD with the wax printing method at curing conditions of 100°C for 7 seconds. For quick bacterial detection, we modified the catalase test with Fenton’s reaction as a colorimetric biochemical reaction. This(More)
The world today is enhanced by imposing trade regulations on various chemicals including nanomaterials. In particular, nanomaterials have different physicochemical property unlike general chemicals, it has become a controversial issue due to concerns related to human health and environment. Due to the potential risks of nanomaterials, most developed(More)
Silver nanomaterials have potentially toxic effects in aquatic organisms. However, lower toxicity was demonstrated in hydra exposed to high concentrations of silver nanomaterials. Moreover, aggregated nanomaterials were shown to be excreted from hydra. These excreted nanomaterials had an increased particle size and changed particle shapes compared to the(More)