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Son, Yong,Yeo, Junyeob,Moon, Hanul,Lim, Tae Woo,Hong, Sukjoon,Nam, Koo Hyun,Yoo, Seunghyup,Grigoropoulos, Costas P.,Yang, Dong‐,Yol,Ko, Seung Hwan WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.28
<P><B>A digital, direct nanoscale metal patterning method</B> is developed using femtosecond laser digital processing of metal nanoparticles for nanoscale electronics fabrication without using conventional vacuum deposition or a photolithography mask. This method is expected to be a potential alternative to the conventional electron beam lithography method for arbitrary nanoscale direct patterning in single‐step, low‐temperature, and non‐vacuum environments.</P>
극미세 3차원 형상복제를 위한 금속몰드 제작에 관한 연구
배공명(Kong Myung Bae),고종수(Jong Soo Ko),박상후(Sang Hu Park),임태우(Tae Woo Lim),양동열(Dong-Yol Yang) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.8
Fabrication of a three-dimensional (3D) metallic mold for multi-production of a microstructure was studied to settle the problem of long processing time in 3D microfabrication. To date, complicated 3D microstructures including 3D photonic crystals, 3D microlens array, 3D filter for microfludics, and something else were created successfully using the two-photon polymerization (TPP) which was considered as paving the way to fabricate a real 3D shape in nano/microscale. However, for those fabrications, much processing time and efforts were inevitably required. To solve this issue, a simple and effective way was proposed in this paper; 3D master patterns were prepared using TPP, and then counter-shaped Ni molds were fabricated by electroforming process. By using these molds, 3D microstructures can be reproduced with short-processing time and low-effort comparing to the conventional approach, TPP. We report some parameters to fabricate a metallic mold precisely.
Effects of Industrial By-products on Reducing Heavy Metal Leaching in Contaminated Paddy Soil
Oh, Se Jin,Oh, Seung Min,Kim, Sung Chul,Ok, Yong Sik,Ko, Tae Yol,Ji, Won Hyun,Yang, Jae E. 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.1
Soil contamination with arsenic and heavy metals is a worldwide problem. Main objective of this research was to evaluated effects of reducing heavy metal leaching under reduced soil condition amended with industrial by-products. The contaminated soil was amended with 3% (w/w) of limestone (Ls), steel slag (SS) and acid mine drainage sludge (AMDS). Synthetic acid rain ($H_2SO_4:HNO_3=6:4$, pH 5.5 fixed) was used for feeding solution with flow rate of $0.78{\sim}0.88mL\;min^{-1}$. Results showed that similar pH and EC of leachate was observed in all treatments regardless of applied industrial by-products. However, arsenic concentration of leachate increased when industrial by-products were mixed. Meanwhile, concentration of heavy metal in the leachate decreased from 11.3 to 4.59 mg for Cd, from 92.3 to 7.93 mg for Pb, and from 11,716 to 1,788 mg for Zn via immobilization in soil with AMDS amended, respectively. Overall, application of industrial by-products can be an environmentally-friendly way to remediate soil and(or) leachate contaminated with metal(loid)s in metal mine site.