- A Study on Voltammetry System Design for Realizing High Sensitivity Nano-Labeled Sensor of Detecting Heavy Metals
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Ju-Myoung Kim, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2012;19(4):297-303.
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DOI: https://doi.org/10.4150/KPMI.2012.19.4.297
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 Abstract
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- In this study, voltammetry system for realizing high sensitivity nano-labeled sensor of detecting heavy metals was designed, and optimal system operating conditions were determined. High precision digital to analog converter (DAC) circuit was designed to control applied unit voltage at working electrode and analog to digital converter (ADC) circuit was designed to measure the current range of 0.1sim1000µA at counter electrode. Main control unit (MCU) circuit for controlling voltammetry system with 150 MHz clock speed, main memory circuit for the mathematical operation processing of the measured current value and independent power circuit for analog/digital circuit parts to reduce various noise were designed. From result of voltammetry system operation, oxidation current peaks which are proportional to the concentrations of Zn, Cd and Pb ions were found at each oxidation potential with high precision.
- Milling Behaviors of Al-B4C Composite Powders Fabricated by Mechanical Milling Process
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Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Min-Ku Lee, Chang-Kyu Rhee, Ju-Myoung Kim, Jin-Kyu Lee
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J Korean Powder Metall Inst. 2012;19(4):291-296.
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DOI: https://doi.org/10.4150/KPMI.2012.19.4.291
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Abstract
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- In the present work, Al-B_4C composite powders were fabricated using a mechanical milling process and its milling behaviors and mechanical properties as functions of B_4C sizes ( 100µm, 500 nm and 50 nm) and concentrations (1, 3 and 10 wt.%) were investigated. For achieving it, composite powders and their compacts were fabricated using a planetary ball mill machine and magnetic pulse compaction technology. Al-B_4C composite powders represent the most uniform dispersion at a milling speed of 200 rpm and a milling time of 240 minutes. Also, the smaller B_4C particles were presented, the more excellent compositing characteristics are exhibited. In particular, in the case of the 50 nm B_4C added compact, it showed the highest values of compaction density and hardness compared with the conditions of 100µm and 500 nm additions, leading to the enhancement its mechanical properties.
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Citations
Citations to this article as recorded by  - Influence of high B4C contents on structural evolution of Al-B4C nanocomposite powders produced by high energy ball milling
Hao Guo, Yu Zhao, Songsong Xu, Junpeng Li, Naimeng Liu, Yang Zhang, Zhongwu Zhang
Ceramics International.2019; 45(5): 5436. CrossRef - Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(3): 215. CrossRef
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