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358 results on '"Jeon, Seungwon"'

34. Gold nanoparticle included graphene oxide modified electrode: picomole detection of metal ions in seawater by stripping voltammetry

Author

Ustundag, Ilknur, Erkal, Asli, Koralay, Tamer, Kadioglu, Yusuf Kagan, and Jeon, Seungwon

Subjects
Electrodes -- Production processes, Metal ions -- Chemical properties, Nanoparticles -- Usage, Seawater -- Contamination, Graphene -- Usage, Voltammetry -- Equipment and supplies, Chemistry
Abstract

We obtained a gold nanomaterial/graphene oxide-modified glassy carbon electrode and characterized it using transmission electron microscope, scanning electron microscope, cyclic voltammetry (CV), and X-ray photoelectron spectroscopy techniques. A response of the electrode using square wave anodic stripping voltammetry for [Pb.sup.2+], [Cu.sup.2+], and [Hg.sup.2+] was found linear in the range from 1 x [10.sup.-7] to 1 x [10.sup.-11] M. The detection limits of [Pb.sup.2+], [Cu.sup.2+] and [Hg.sup.2+] were 0.14, 0.5 and 1.2 pM, respectively. The method was applied to the simultaneous determination of [Pb.sup.2+], [Cu.sup.2+] and [Hg.sup.2+] in seawater samples from a coastal region of Anatolia, and the results corresponded well with the values obtained by inductively coupled plasma-optical emission spectroscopy. Keywords: seawater sample, voltammetry, gold nanomaterial, graphene oxide, heavy metal determination, modified electrode, Determining the chemical composition of seawater is highly important as it is largely related to geological and geochemical processes. Heavy metals and metalloids have great importance in terms of human [...]

Published
2016
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47. Initial Wetting Phenomena of MgO–SiO2 Liquid Slag on MgO–C Refractories.

Author

Jeon, Seungwon, Myung, Jaewoo, and Chung, Yongsug

Subjects
CONTACT angle, REFRACTORY materials, WETTING, LIQUIDS
Abstract

The initial wetting phenomena of MgO–SiO2 slag on MgO–C refractories were studied using the dispensed drop technique at 1873 K. As the carbon content increased, the apparent contact angle and height increased, whereas the apparent radius decreased. The change in the apparent contact angle according to the carbon content was applied to the Cassie model. Reduced Si was observed at the boundary between the slag and the refractories.it was seen that SiO2(l) + 2C(s) = Si(l) + 2CO(g) was the main reaction. [ABSTRACT FROM AUTHOR]

Published
2023
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