• 대한기계학회논문집A
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• 제30권7호
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• pp.773-778
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• 2006

High-aspect-ratio nano-hair or nano-pillar arrays have great potential in a variety of applications. In this study, we present a simple and cost-effective replication method of high-aspect-ratio polymer nano-hair arrays. Highly ordered nano-porous AAO (anodic aluminum oxide) template was utilized as a reusable nano-mold insert. The AAO nano-mold insert fabricated by the two-step anodization process in this study had close- packed straight nano-pores, which enabled us to replicate densely arranged nano-hairs. The diameter, depth and pore spacing of the nano-pores in the fabricated AAO nano-mold insert were about 200nm, $1{\mu}m$ and 450nm, respectively. For the replication of polymer nano-hair arrays, a UV nano embossing process was applied as a mass production method. The UV nano embossing machine was developed by our group for the purpose of replicating nano-structures by means of non-transparent nano-mold inserts. Densely arranged high-aspect-ratio nano-hair arrays have been successfully manufactured by means of the UV nano embossing process with the AAO nano-mold insert under the optimum processing condition.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.150.2-150.2
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• 2005

• 한국염색가공학회지
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• 제32권1호
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• pp.27-37
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• 2020

Low temperature dyeing properties of wool with reactive dyes and acid dyes were investigated for the feasibility study of their application to hair dyeing. The low temperature(30℃, 40℃) dyeing achieved light depth of shade in wool dyeing and reactive dyeing exhibited relatively higher color strength and chroma values than acid dyeing. Leveling agent slightly improved the levelness of the wool dyeing and the leveling properties of dyed wool at low temperature were good to excellent, irrespective of the dyes applied. Color loss during the repeated shampooing was in the range of 9.6~22.2% for reactive dyes and -7.4~31.5% for acid dyes and in some cases, the color fastness to shampooing was reasonable level. The overall experimental results showed that the application of low temperature wool reactive dyeing to hair dyeing is sufficiently feasible in terms of dyeability and color fastness to shampooing.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.113-116
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• 2006

Some nano hair systems in the nature are found to show excellent adhesive characteristic, which is called dry adhesive, and synthetic nano hairs to mimic these adhesiveness are believed to have many applications. To develop a practical synthetic dry adhesive system, we mold nano hairs on plastic substrates using thermoplstic materials including COC, PP, PC and PMMA. and estimate the moldability and the adhesive characteristic. As a template for molding nano hairs, AAO membrane is first adopted, which is 60um thick and 13mm in diameter. This membrane has about a billion of through-holes of which diameter is around 200nm. This AAO membrane and the pellet of materials are stacked in the mold and pressed to mold after heating up to be melted. The AAO membrane is removed using KOH to obtain the molded nano hairs. As a result, the diameter of the molded hairs is around 200nm and the length is $2um{\sim}60um$ depending on the molding conditions and materials. The molded nano hair substrates is estimated to show much better adhesive characteristic than a substrate without nano hairs.

• Elastomers and Composites
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• 제44권2호
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• pp.98-105
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• 2009

내이의 달팽이관은 기저막(basilar membrane)과 유모세포(hair cells)라는 두 가지 중요한 요소로 이루어져 있다. 기저막은 귀로 들어오는 소리를 주파수에 따라 분리하는 기능을 가지고 있으며, 기저막 위에 있는 유모세포는 생체전기 신호를 발생시키는 기계적 감각 수용기관이다. 인간의 생체청각기구를 모사한 인공와우와 신개념의 인공감각기관을 개발하기 위해서, 본 논문에서는 ZnO 압전 나노필라를 사용하여 인공유모세포(artificial hair cell)를 구현할 수 있는 핵심 기반 기술인 생체모사 기술을 연구하였다. 그 구체적인 방법으로 ZnO 나노필라를 저온성장법으로 유연기판에, 고온성장법으로 실리콘 웨이퍼에 성장시켰다. 유연기판과 실리콘 웨이퍼 위에 ZnO 나노필라를 성장 전에 미리 패턴을 만들었고, 기판에 선택적으로 ZnO 나노필라를 성장시켰다. 또한 ZnO 나노필라의 동적 정적 거동을 이해하기 위해 다중 물리 해석기법을 사용하여 ZnO 나노필라의 electric potential, von Mises stress, 변형량 등을 분석하였다. 본 연구에서는 ZnO 나노필라를 제작 및 패터닝하는 기술과 최적화하는 다중 물리 해석기술을 이용하여 인공 유모세포를 구현하는 핵심기술을 개발하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.152.2-152.2
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• 2005

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.471-472
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• 2006

High aspect ratio of nano hairs on a plastic substrate is molded using thermoplstic materials including COC, PP, PC and PMMA. As a template for molding nano hairs, AAO membrane is adopted, which is 60um thick and 13mm in diameter. This membrane has about 109 of through-holes of which diameter is around 200nm. This AAO membrane and the pellet of materials are stacked in the mold and pressed to mold after heating up to be melted. The AAO membrane is removed using KOH to obtain the molded nano hairs. As a result, the diameter of the molded hairs is around 200nm and the length is $2um{\sim}60um$ depending on the molding conditions and materials.

• 소성∙가공
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• 제16권1호
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• pp.20-24
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• 2007

Polypropylene substrate with hair-like nano features(aspect $ratio{\sim}10$) on the surface is fabricated by injection molding process. Pure aluminum plate is anodized to have nano pore array on the surface and used as a stamper for molding nano features, The size and the thickness of the stamper is $30mm{\times}30mm$ and 1mm. The fabricated pore is about 120nm in diameter and 1.5 um deep. For molding of a substrate with nano-hair type of surface features, the stamper is heated up over $150^{\circ}C$ before the filling stage and cooled down below $70^{\circ}C$ after filling to release the molded part. For heating the stamper, stamper itself is used as a heating element by applying electrical power directly to each end of the stamper. The stamper becomes cooled down without circulation of coolant such as water or oil. With this new stamper heating method, nano hairs with aspect ratio of about 10 was successfully injection molded. We also found the heating & cooling process of the stamper is good for releasing of molded nano-hairs.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2010년도 제3회 국제학회
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• pp.112-112
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• 2010

• 폴리머
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• 제37권3호
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• pp.393-398
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• 2013

본 실험에선 미녹시딜을 함유한 수용성 고분자 젤로부터 solvent casting 방법으로 250과 $750{\mu}m$ 두 가지 길이의 미녹시딜이 함유된 용융형 고분자 마이크로 니들(micro-needle)을 제작하였다. 제작된 미녹시딜을 함유한 용융형 고분자 마이크로 니들은 기계적 강도가 입증된 고분자 니들과 동일한 형태 및 기계적 강도를 나타냈으며, 성공적으로 피부를 투과함을 확인하였다. 제조된 고분자 마이크로 니들의 경우 피부 적용 후 최소 30분 이상은 부착되어야 전체 니들의 50% (v/v) 이상이 피부 내로 용융되었으며, 니들 적용부위에서 서서히 약물의 방출 및 확산을 확인할 수 있었다. 또한 C57BL/6 동물 모델을 통해 미녹시딜이 함유된 250, $750{\mu}m$ 길이의 고분자 마이크로 니들이 무처리군 혹은 미녹시딜 처리군에 비해 발모에 긍정적인 영향을 나타냄을 확인할 수 있었다.