Lee, Sung-Hoon Kim, Young-Tae Yang, Sungwook Yoon, Eui-Sung Kim, Dae-Eun Suh, Kahp Y. 2024-01-20T19:31:11Z 2024-01-20T19:31:11Z 2021-09-02 2010-05 1944-8244 https://pubs.kist.re.kr/handle/201004/131498 We present a simple surface modification method for enhancing the frictional properties on soft, viscoelastic tissue Of large intestine by integrating micropatterned structures with controlled shape and geometry. The micropatterned end-effecter (EE) was fabricated onto micromachined EE body (20 mm long, 2 mm diameter cylinders) in the forms of line, box, pyramid, and bottle shape by utilizing capillary molding technique with UV-curable poly(urethane acrylate) (PUA) polymer. To evaluate the frictional behavior of micropatterned EE, we employed a biotribotester, for easy loading and test of a biological organ specimen. It was found that the frictional properties of micropatterned EE are heavily dependent upon the shape of microstructure. The patterned EE with parallel lines (to the direction of locomotion) showed better frictional performance (average frictional coefficient similar to 1.53 and maximum similar to 3.98) compared with other micropatterned EEs (average frictional coefficient 0.72-0.94 and maximum 1.78-2.49) and nonpatterned EE (average frictional coefficient similar to 0.58 and maximum similar to 1.51). In addition, various geometric parameters (e.g., height, width, and space) as well as operating conditions (e.g., contact load and sliding speed) were systematically investigated for probing optimal anchoring function of the parallel line patterned EE. English American Chemical Society GASTROINTESTINAL-TRACT CAPSULE ENDOSCOPES MEDICAL DEVICES DRY ADHESIVE LOCOMOTION LITHOGRAPHY ENHANCEMENT FABRICATION MECHANISM NANOHAIRS An Optimal Micropatterned End-Effecter for Enhancing Frictional Force on Large Intestinal Surface Article 10.1021/am900723a 1 ACS Applied Materials & Interfaces, v.2, no.5, pp.1308 - 1316 ACS Applied Materials & Interfaces 2 5 1308 1316 scie scopus 000277977400008 2-s2.0-77954988040 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article GASTROINTESTINAL-TRACT CAPSULE ENDOSCOPES MEDICAL DEVICES DRY ADHESIVE LOCOMOTION LITHOGRAPHY ENHANCEMENT FABRICATION MECHANISM NANOHAIRS friction colon endoscope microfabrication end effector surface patterning