http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Eunseung Hwang (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Selective Laser Pyrolytic Micropatterning of Stretched Elastomeric Polymer Surfaces
Eunseung Hwang,Younggeun Lee,Jaemook Lim,Youngchan Kim,Weihao Qu,Koungjun Min,이원철,홍석준 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
The patterning of surface structures is a critical step for interfacial engineering applications that are based on soft lithography, casting, or imprinting techniques in general. However, photolithography and mold/die fabrication processes are expensive and time-consuming. To solve this problem, we developed a novel laser-based process that exploits the high stretchability of a polymer. In this study, continuous-wave laser-induced pyrolysis was conducted on a pre-stretched Ecoflex polymer substrate to obtain a controllable hydrophobic surface with functional structures at the micro/nanoscale, which were constructed via the facile removal of pyrolytic byproducts. Under the optimum strain rate and laser parameters, periodic wrinkle generation and a proportional channel pitch reduction were observed, which provided hierarchical micro/nanostructures and enlarged the air gaps between the target droplet and the hydrophobic structures. The processed surface exhibited improved hydrophobic properties (WCA ~ 135°) compared with a flat Ecoflex polymer surface (WCA ~ 105°). Thus, a facile manufacturing method for stretchable polymer substrates with hydrophobic patterned surfaces is proposed.
-
Pyrolytic Jetting of Highly Porous Laser-Induced Graphene Fiber for Cost-Effective Supercapacitor
Dongwoo Kim,Hyunkoo Lee,Eunseung Hwang,Sukjoon Hong,Habeom Lee 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
The recently reported laser pyrolytic jetting process enables facile generation of highly porous, free-standing graphene fiber from polyimide film upon the scanning of tightly focused continuous-wave laser. As a follow-up study, we claim that the corresponding laser pyrolytic jetting process is favorable for the fabrication of relevant energy device applications compared to the conventional LIG process in both energy-saving and material-saving perspectives. Moreover, the volume of the pyrolysis product is substantially increased in the case of pyrolytic jetting compared to conventional LIG, resulting in an extended surface area for storing more electric charges. At the same time, material characterization by Raman measurement validates that the exfoliated product from pyrolytic jetting is analogous to the conventional LIG and therefore suitable for supercapacitor application. As a result, supercapacitor created by the pyrolytic jetting allows substantial enhancement in the capacitance compared to the conventional LIG for both with and without manganese oxide layer coating, proposing the potential of pyrolytic jetting for the efficient fabrication of carbon-based energy devices.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
