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탐침 프로필라미터를 사용한 하이드로젤 마이크로캔틸레버의 탄성계수 측정
송정기(Jungki Song),이정철(Jungchul Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This paper reports measurements of elastic moduli for hydrogel microcantilevers by employing a stylus profilometer. First, hydrogel microcantilevers were fabricated with poly(ethylene glycol) diacrylate (PEGDA) using a polydimethylsiloxane (PDMS) cantilever mold via UV crosslinking along with capillary force induced filling into the mold. The length of fabricated hydrogel microcantilevers was controlled by cutting them using a razor blade after crosslinking while other dimensions were determined by the PDMS cantilever mold. Finally, crosslinked hydrogel microcantilevers were scanned with a stylus profilometer to examine their out-of-plane bendings at a fixed contact load. By applying cubic root fitting to the cantilever deflections, elastic moduli of tested hydrogel microcantilevers were extracted. PEGDA Mw 250 and 575 with 1 wt% of photointiator (phenylbis (2, 4, 6-trimethylbenzoyl) phosphine oxide) were used as testing materials. Commercial silicon microcantilevers were used to calibrate the stylus forces and other possible error sources were provided.
산소 플라즈마 식각을 이용한 20 ㎚ 이하 탐침 곡률반경 하이드로젤 켄틸레버 제작 및 고분해능 이미징
송정기(Jungki Song),이재설(Jaeseol Lee),이정철(Jungchul Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper reports fabrication of sub-20 ㎚ hydrogel microcantilevers based on replica molding and O2 plasma ashing and their comparable imaging capability with silicon counterparts. First, hydrogel microcantilevers were fabricated with poly(ethylene glycol) diacrylate (PEGDA) using a polydimethylsiloxane (PDMS) cantilever mold via UV crosslinking along with capillary force induced filling into the mold. Second, Pyramid mold was integrated to the free-end of the hydrogel microcantilevers. PEGDA was dispensed into the pyramid mold, bi-axially compressed for 10~20% strain, aligned with the tipless hydrogel microcantilever, and UV cured. Third, tip radius of hydrogel microcantilevers was improved to be sub-20 ㎚ by O2 plasma ashing. Tip radius decrease depending on initial tip radius was characterized by varying the time for plasma ashing. Finally, topography of anodized aluminum oxide (AAO) (width 50 ㎛, depth 2 ㎛) was imaged in non-contact (NC) mode. Sharp hydrogel tip is shown to be free of degradation while imaging in NC mode.
원자현미경 활용을 위한 하이드로젤 탐침의 마모 특성 분석 및 재생
이재설(Jae Seol Lee),송정기(Jungki Song),이정철(Jungchul Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this paper, we integrated hydrogel-poly(ethylene glycol) diacrylate nanotips on silicon cantilevers. This hydrogel nanotips were used in atomic force microscope for topographical imaging. Due to the soft material property, hydrogel can be worn while it scans a hard substrate. For maintaining the performance of hydrogel nanotips, wear characteristics were analyzed with harsh imaging conditions. Worn nanotips did not make high-resolution topographical images, so we propose novel method to regenerating hydrogel nanotips as countermeasure of wear. Hydrogel nanotip can make the silicon cantilever reusable by tip regeneration.