• Proceedings of the Korean Vacuum Society Conference
• /
• 2015.08a
• /
• pp.196.1-196.1
• /
• 2015

전 세계적으로 환경에 대한 인식이 증대됨에 따라 친환경적인 소재의 개발 연구가 필요한 상황이고, 대표적으로 셀룰로오스를 이용한 종이기판을 활용하는 방안이 새로운 연구화두로 떠오르고 있다. 종이를 기본으로 한 전기전자 회로구성의 가능성을 보기위해 종이 위해 전자회로 구성요소를 형성시켜야 할 필요가 있다. 이를 위해 본 연구팀은 상용 복사 용지위에 마이크로 단위의 패터닝을 구현하는 연구를 진행하였다. 마이크로 패터닝 구현 방법은 다음과 3가지로 요약할 수 있다;1. 리소그래피 공정, 2. 메탈마크스를 사용한 물질 증착, 3. 잉크젯 프린팅. 리소그래피 공정을 위해서 발수처리를 한 종이 위에 실리콘기반 공정과 마찬가지로 레지스트를 코팅하고 노광과 디벨롭, 증착과 리프트오프 과정을 거쳤다. 공정 결과 패터닝이 어느 정도 잘 되는 것을 확인할 수 있었다. 두번째로 상용 메탈마스크를 제작하여 종이 위에 그대로 증착하는 방법을 사용하였다. 이 방법은 액상공정을 요구하지 않기 때문에 발수처리가 필요하지 않고 종이의 기본성질을 그대로 유지 할 수 있다는 장점이 있다. 마지막으로 잉크젯 프린팅 공정은 복사용지를 인쇄할 때 사용하는 간단한 상용프린터를 이용하였다. 이 방법은 앞의 두 공정보다는 다소 패턴 사이즈가 크다는 단점이 있지만 원하는 모양을 자유롭게 패터닝 할 수 있고 그만큼 대량 생산에 용이하다는 장점이 있다.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.24 no.1
• /
• pp.67-76
• /
• 2008

Implant requires long lasting, strong osseointegration using bio-mechanical interlocking by bone ingrowth. In regarding the size level for bone ingrowth, the micro-patterning would enhance bone response. Micro-patterning can increase the area contacting the bone tissues. Therefore, it may distribute the load to the surrounding bone tissue, more effectively. This study compared and analyzed the load distributing effect with the shape and number of micro-patterning. For the optimal comparison of threads, the assumptions different from general finite element analysis model were made. It was assumed that the implant was axisymmetric and infinitely long. The implant was assumed to be completely embedded in the infinitely long cortical bone and to have 100% bone apposition. The implant-bone interface had completely fixed boundary conditions and received an infinitely big axial load. The condition of threads were as follows. The reference model 1 had conventional thread. Model 2 had 2 micro-patterns on the upper flank of the thread. Model 3 had 2 micro-patterns on the lower flank of the thread. Model 4 had 2 micro-patterns on the upper and lower flanks of the thread. Model 5 had 3 micro patterns on the upper and lower flanks of the thread. The results were as follows: 1. The thread with micro-patterns distributed stress better than the conventional thread. 2. The thread with micro-patterns on the lower flank distributed stress better than that with micro-patterns on the upper flank. 3. The thread with 3 micro-patterns distributed stress better than that with 2 micro-patterns, However, an area with stress concentration occurred.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.29 no.2
• /
• pp.111-118
• /
• 2023

In this study, the feasibility of laser patterning on the surface of food packaging polymer film was confirmed, and the surface patterning process conditions of femtosecond laser were established. In addition, it was proved that the surface properties of the film can be changed and controlled through the fabrication of various patterned films on the surface of food packaging films such as HDPE, PP, and PET. Various patterned surfaces, including large-scale circular patterns induced by a single femtosecond laser pulse, roughness patterns achieved by overlapping single pulses by 30%, straight line patterns, roughness patterns obtained by overlapping straight line patterns, and grid patterns formed by intersecting straight line patterns were fabricated. The characteristics of the patterned HDPE, PP, and PET films, based on the surface pattern structure and size, were analyzed using SEM, AFM, and contact angle measurements. Compared to the surface of each control film without femtosecond laser patterning, the contact angles of the surfaces of large-area circular patterning HDPE and PP films, large-area roughness patterning HDPE and PP films by overlapping 30% of single pulses, and large-area roughness patterning PET film by overlapping rectilinear patterning were in the range of 27.1-37.5 degree. This indicated that the HDPE, PP, and PET films became more hydrophilic after patterning. On the other hand, the HDPE film patterned with a large-scale grid pattern exhibited a contact angle of 120.4 degree, indicating that the HDPE film became more hydrophobic after patterning. Therefore, films that have been changed to hydrophilic surfaces through patterning can be used in anti-fouling applications where proteins, cells, viruses, and other food materials do not adhere or are easily detached. In addition, if a superhydrophobic surface of 150 degrees or more is fabricated through more precise lattice patterning in the future, it will be possible to use it for superhydrophobic surface applications such as self-cleaning.

• Information Display
• /
• v.12 no.5
• /
• pp.33-38
• /
• 2011

• Journal of the KSME
• /
• v.46 no.6 s.307
• /
• pp.45-49
• /
• 2006

• 기계와재료
• /
• v.16 no.1 s.59
• /
• pp.50-59
• /
• 2004

• KSBB Journal
• /
• v.21 no.4
• /
• pp.273-278
• /
• 2006

The noble method of hybrid agarose gel microstamp fabricated by replica molding against PDMS master to make bacteria patterns on agar surface was presented. After the fabricated hybrid agarose gel microstamp was inked with E. coli, we could obtain 2 dimensional bacterial arrays with $50{\mu}m$ circular spots. And the various shaped patterns based on experimental design were easily generated. The analysis of mean fluorescent signal was showed that bacterial pattern have high contrast between spots and background and homogeneity of pattern. Our proposed method solved the problem of wetting and handling with small soft agarose gel microstamp when bacteria were used for ink. The agarose gel stamp provides appropriate environment to inked bacteria, which is essential technology for cell patterning with high retaining viability during the patterning process. This method is reproducible, convenient, rapid, and could be applied to screening system, study of cell-surface interaction, and microbial ecology.

• 기계와재료
• /
• v.19 no.3 s.73
• /
• pp.126-133
• /
• 2007

• The Optical Journal
• /
• s.174
• /
• pp.54-62
• /
• 2019

• Journal of the Korean Society for Precision Engineering
• /
• v.30 no.2
• /
• pp.236-240
• /
• 2013

In this presentation, we propose a fabrication method of PDMS stencil to apply into a localized culture of NIH/3T3 cells. PDMS stencil was fabricated by nitrogen gas blowing and soft lithography from preparing SU-8 master mold by photolithography. PDMS stencil pattern was production of the circle size 20 to $500{\mu}m$. In the culture test of PDMS stencil, a stencil was placed on a glass disk. The NIH/3T3 cells were successfully cultured into micropatterns by using the PDMS stencil. The results showed that cells could be cultured into micropatterns with precisely controlled manner at any shapes and specific size for bioscience study and bioengineering applications.