• Title/Summary/Keyword: 볼 밀링

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A Study on the Dispersion Characteristics of Carbon Nanotubes using Cryogenic Ball Milling Process (극저온 볼밀링 공정을 이용한 탄소나노튜브의 분산특성 연구)

  • Lee, Ji-Hoon;Rhee, Kyong-Yop
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.7
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    • pp.49-54
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    • 2010

  • The cryogenic ball milling was performed on carbon nanotubes (CNTs) at an extremely low temperature to increase the dispersion of CNTs. The effects of milling speed and time on the deagglomeration and structural changes of CNTs were studied. FESEM was used to analyze the dispersion and the change of particle size before and after milling process. Transmission electron microscopic (TEM) analysis was also investigated the effect of cryogenic ball milling on the morphological characteristics of CNTs. The structural changes by the cryogenic ball milling process were further confirmed by x-ray diffraction (XRD) and Raman spectroscopic analysis. The results showed that the agglomeration of CNTs was significantly reduced and amorphous structure was observed at high milling speed. However, the milling time has no great effect on the dispersion property and structural change of CNTs compared with milling speed.

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Mechanical Behavior of Al/C60-fullerenes Nanocomposites (풀러렌이 분산된 알루미늄기지 나노복합재의 기계적 거동)

  • Choi, Hyun-Joo
    • Composites Research
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    • v.26 no.2
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    • pp.111-115
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    • 2013

  • Aluminum-based composites containing $C_{60}$-fullerenes are produced by hot rolling of ball-milled powder. The grain size of aluminum is effectively reduced to ~100 nm during ball-milling processes, leading to grain refinement strengthening of the composite. Furthermore, $C_{60}$-fullerenes are gradually dispersed during ball-milling processes and hence the strength of the composite increases with the volume of $C_{60}$-fullerenes. The composite containing 10 vol% $C_{60}$-fullerenes with a grain size of ~ 100 nm exhibits ~1 GPa of compressive strength.

  • https://doi.org/10.7234/composres.2013.26.2.111 인용 PDF KSCI

Micronization of Ibuprofen by Cryogenic Ball Milling (극저온 볼 밀링을 통한 Ibuprofen 분말의 마이크로화)

  • 조현갑;이경엽;백영남;박훈재;이상목
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.11
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    • pp.195-199
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    • 2004

  • For the present study, the cryogenic ball milling process was applied to make Ibuprofen microsized. The cryogenic ball milling was performed at low temperature of about -18$0^{\circ}C$ for 6 hours. The particle size distribution was determined before and after the cryogenic process. X-ray diffraction (XRD) measurement was made to determine the effect of cryogenic process on the crystallinity of Ibuprofen. The results showed that the size of Ibuproffn was reduced about 10 times by the cryogenic process. The degree of crystallinity of Ibuproffn was slightly reduced by the cryogenic process.

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