• 한국자원식물학회지
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• 제24권3호
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• pp.309-313
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• 2011

Houttuynia cordata is used as a raw material of oriental medicine to acquire antioxidant and anti cancer effect and to cure a heart disease. Mechanochemical technology not only reduces the size of the object but also changes the chemical properties of the object. Extraction of functional materials from the Houttuynia cordata after grinding as a pretreatment using the mechanochemical technology was conducted in this study to investigate the effect of grinding on the yields and antioxidant activities of the extract. Houttuynia cordata was ground by the planetary ball mill and the morphology was analyzed by SEM. Yields of functional materials were increased from 6.2 g in the sample without grinding to 7.0, 7.8, 8.8 g after grinding of 30 minutes, 1 hour and 2 hours, respectively. Nitrite scavenging abilities were increased from 57-77% to 69-86% as a result of mechanochemical pretreatment. Also, DPPH scavenging abilities for the methanol extraction were increased from 10.01-40.29% to 11.01-49.29% as a result of mechanochemical grinding.

• 한국건설순환자원학회논문집
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• 제9권3호
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• pp.367-374
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• 2021

본 연구는 기계·화학적 에너지를 활용하는 메카노케미칼 공정기술을 자기치유 혼화재에 적용하기 위한 목적으로 진행되었다. 기계·화학적 공정기술을 자기치유 혼화재 제조 공정에 적용하여 치유 소재의 활성화 에너지를 증가시켜 치유성능에 미치는 영향을 확인하고자 하였다. 자기치유 모르타르에 사용한 자기치유 소재는 팽창/팽윤제를 주요 구성물로 선정하고 탄산염 촉진제와 무기염 첨가제를 기타 첨가제로 혼입하였으며, 기계·화학 처리공정 적용에 의한 치유 소재의 활성화도 및 개질화 반응이 가능한 재료로 선택하였다. 기계·화학 처리공정에 대한 자기치유 혼화재의 기초평가는 XRD, FT-IR 분석으로 확인하였으며, 자기치유 모르타르의 치유 성능평가는 정수위 투수시험을 이용하여 치유율을 확인하였다. 치유성능 확인결과 기계·화학 처리 공정을 적용한 WM3 시료(MC360min)가 공정처리 하지 않은 WM1 시료에 대비 치유성능이 4.1% 증가하였으며, 자기치유율은 평균 94.3%로 확인되었다.

• 한국세라믹학회지
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• 제38권12호
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• pp.1110-1114
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• 2001

열화학기상증착법으로 탄소나노튜브를 합성할 때, 촉배전구체로 사용하는 Fe(NO$_3$)$_3$.9$H_2O$-Al(OH)$_3$혼합물을 믹서밀을 이용하여 혼합분쇄한 후, 이 혼합물을 사용하영 합성에 미치는 메카노케미컬 효과를 조사하였다. SEM과 TEM 관찰 결과, 분쇄된 촉매 위에서 합성된 탄소생성물이 미분쇄 촉매위에서 성장한 생성물에 비해 훨씬 균일했으며, 대부분의 생성물이 탄소나노튜브로서 존재하였다. 또한, 전류-전압 측정을 통해서, 분쇄 촉매에서의 생성물의 전계 방출 특성이 미분쇄 촉매에서보다 우수함을 확인하였다.

• 반도체디스플레이기술학회지
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• 제3권1호
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• pp.9-13
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• 2004

Carbon nanofibers (CNFs) with uniform diameter and controlled size were prepared from catalytic decomposition of $\textrm{C}_{2}\textrm{H}_{2}$ with Ni-MgO catalyst treated by mechanochemical (MC) process. The properties of Ni catalyst, such as size, distribution and morphology, can be governed by tuning grinding time in MC process. As a result, size and structure of CNFs can be tailored. The effect of grinding time to the as-grown CNFs was studied. CNFs with diameter from 10-70 nm were synthesized. CNFs with bundle formation sharing one tip and twisted CNFs were also synthesized with catalyst treated by MC process.

• 한국자원식물학회지
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• 제24권3호
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• pp.314-318
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• 2011

Saururus chinensis is used as a raw material of an anti-rheumatic, poultice, sedative and stomachic. The tea of dried Saururus chinensis leaves has a function of relaxing pains in back and breast and of treating stomach ailments. The plant has the functions of anti-inflammatory, depurative, diuretic, febrifuge and refrigerant. The extraction of functional material is carried out by methanol and ethanol solvents. Mechanochemical grinding is applied as a pretreatment process before extraction to enhance the extraction efficiency by increasing the surface area of the materials while changing the chemical properties of the materials. Extraction of functional materials from the Saururus chinensis after grinding as a pretreatment using the mechanochemical technology was accomplished in this study to investigate the effect of grinding on the antioxidant activities of the extract. Saururus chinensis was ground by the planetary ball mill and the morphology was analyzed by SEM. Mechanochemical pretreatment increased the yields of functional materials from 5.9 g to 6.4, 7.0, and 8.1 g after grinding of 30 minutes, 1 hour and 2 hours, respectively. Nitrite scavenging ability increased from 53.0-71.0% to 61.0-79.0% for the methanol extraction in the solution of pH 1.2. Also, Electron donating abilities were increased from 7.90-33.51% to 11.97-38.51% for the methanol extraction. The extract concentration for the half inhibition of DPPH radicals was reduced from $278{\mu}g/mL$ in the original sample to $263{\mu}g/mL$ in the sample after grinding for the methanol extraction.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2003년도 춘계학술발표강연 및 논문개요집
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• pp.171-171
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• 2003

• 한국재료학회:학술대회논문집
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• 한국재료학회 2001년도 춘계학술발표강연 및 논문개요집
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• pp.164-164
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• 2001

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2000년도 추계총회,초청강연,특별강연,연구발표회
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• pp.34.1-34
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• 2000

• Bulletin of the Korean Chemical Society
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• 제25권5호
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• pp.617-619
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• 2004

As an pretreatment, a Fe$(NO_3)_3{\cdot}9H_2O-Al(OH)_3$mixture was ground by a high energy mill and used as a supported catalyst for the growth of carbon nanotubes by a thermal CVD. The crystal structure of the catalyst disordered by the grinding influenced significantly the synthesis of carbon nanotubes in a thermal CVD.

• 한국정밀공학회지
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• 제13권6호
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• pp.45-51
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• 1996

Silicon wafers are required to be finished under the roughness of nanometer order for the subsequent chip fabrication processes. Recently, the finish grinding techniques have been researched for the improvement of accuracy and surface roughness simultaneously. Among them, the grinding technique using fine abrasive has been known as an easily accessible method. However, the manufacture of the fine grit grinding wheel has been very difficult because of the coherence of the grits. In this paper, the development of the ultrafine grit silica($SiO_2$) grinding wheel by the combination of the binder coating and the vacuum forming techniques is reported. And, the mechanochemical removal effects of the grinding conditions are discussed. Finally, a successful result of Ra O.4nm. Rmax 4nm in the ground surface roughness of a 6 inch silicon wafer was achieved.