[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 29, No. 4, pp.310-316

ISSN: 2508-5107 (Online)

Print publication date 15 Aug 2020

Received 20 Jul 2020 Revised 14 Aug 2020 Accepted 14 Aug 2020

DOI: https://doi.org/10.7735/ksmte.2020.29.4.310

초발수 특성을 이용한 기체투과성 방수 필름 제작 및 특성 평가

신태환^a ; 이상우^a ; 김병희^a ; 서영호^a^{, *}

Fabrication and Evaluation of Gas Permeable Waterproof Film based on Superhydrophobic Characteristics

Tae Hwan Shin^a ; Sang Woo Lee^a ; Byeong Hee Kim^a ; Young Ho Seo^a^{, *}

aDepartment of Mechatronics Engineering, Kangwon National University

Correspondence to: ^*Tel.: +82-33-250-6378 E-mail address: mems@kangwon.ac.kr (Young Ho Seo).

Abstract

In this paper, a gas permeable waterproof film with superhydrophobic characteristics of irregular microstructures and vertical microchannels, is presented. A wet etching technique of aluminum alloys was employed for the preparation of a superhydrophobic surface, and a typical punching technique was used for the fabrication of vertical microchannels. A waterproof film was created via the casting process of polydimethylsiloxane (PDMS). The contact angle of the prepared film was measured as 156°, and the diameter of the vertical microchannel was approximately 100 μm. In the experiment involving maximum liquid entry pressure (LEP) measurement, the LEP of the microtextured PDMS film with 50 vertical microchannels was approximately 16 kPa, whereas the smooth PDMS film could not withstand any pressure. In the long-term reliability test, by using a pressure relief valve of 14 kPa, the fabricated film maintained the water pressure without any leakage.

Keywords:

Irregular microstructures, Gas-permeable, Waterproof, Superhydrophobic

Acknowledgments

이 연구는 2017년도 강원대학교 학술연구조성비(과제번호-520170142)의 지원과 이 성과의 일부는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No.2020R1F1A1072693).

References

Vorosmarty, C. J., McIntyre, P. B., Gessner, M. O., Dudgeon, D., Prusevich, A., Green, P., Glidden, S., Bunn, S. E., Sullivan, C. A., Liermann, C. R., Davies, P. M., 2010, Global Threats to Human Water Security and River Biodiversity, Nature, 467:7315 555-561. [https://doi.org/10.1038/nature09549]
Shannon, M. A., Bohn, P. W., Elimelech, M., Georgiadis, J. G., Marinas, B. J., Mayes, A. M., 2008, Science and Technology for Water Purification in the Coming Decades, Nature, 452:7185 301-310. [https://doi.org/10.1038/nature06599]
WL Gore and Associates Inc, 1978, Waterproof Laminate, US Patent: 4194041A.
Cho, D. J., Kim, S. E., Seo, E., Lee, M. C., Lee, J. M., Ko, J. S., 2013, Underwater Micro Gas Detector, Sensors and Actuators B: Chemical, 188 347-353. [https://doi.org/10.1016/j.snb.2013.06.064]
Kim, J., Lee, Y. K., Kang, K. M., Lee, S., Moon, S. K., Ok, J. G., 2018, Development of Continuous Nanopattern Manufacturing System Based on High-frequency Vibrational Indentation of Flat-edge Tool on a Horizontal-feeding Polymer Substrate, Journal of the Korean Society of Manufacturing Technology Engineers, 27:3 182-187. [https://doi.org/10.7735/ksmte.2018.27.3.182]
Kim, B. S., Harriott, P., 1987, Critical Entry Pressure for Liquids in Hydrophobic Membranes, Journal of colloid and interface science, 115:1 1-8. [https://doi.org/10.1016/0021-9797(87)90002-6]
Fisher, L. R., Lark, P. D., 1979, An Experimental Study of the Washburn Equation for Liquid Flow in very Fine Capillaries, Journal of Colloid and Interface Science, 69:3 486-492. [https://doi.org/10.1016/0021-9797(79)90138-3]
Servi, A. T., Kharraz, J., Klee, D., Notarangelo, K., Eyob, B., Guillen-Burrieza, E., Liu, A., Arafat, H. A., Gleason, K. K., 2016, A Systematic Study of the Impact of Hydrophobicity on the Wetting of MD Membranes, Journal of Membrane Science, 520 850-859. [https://doi.org/10.1016/j.memsci.2016.08.021]
Yazgan-Birgi, P., Ali, M. I. H., Arafat, H. A., 2018, Estimation of Liquid Entry Pressure in Hydrophobic Membranes Using CFD Tools, Journal of Membrane Science, 552 68-76. [https://doi.org/10.1016/j.memsci.2018.01.061]
Nishiyama, N., Yokoyama, T., 2017, Permeability of Porous Media: Role of the Critical Pore Size, Journal of Geophysical Research: Solid Earth, 122:9 6955-6971. [https://doi.org/10.1002/2016JB013793]
Xu, T. T., Piner, R. D., Ruoff, R. S., 2003, An Improved Method to Strip Aluminum from Porous Anodic Alumina Films, Langmuir, 19:4 1443-1445. [https://doi.org/10.1021/la0264724]

Tae Hwan Shin

M.Sc. candidate in Department of Mechatronics Engineering, Kangwon National University. Current affiliation is PSK Inc.His research interest is next-generation semiconductor equipments.

E-mail: sth5715@kangwon.ac.kr

Sang Woo Lee

Ph.D. candidate in Department of Mechatronics Engineering, Kangwon National University.His research interest is electronic nose systems based on sensor array and machine-learning technique.

E-mail: lswoo@kangwon.ac.kr

Byeong Hee Kim

Professor in the Department of Mechatronics Engineering, Kangwon National University.His research interest is micro and nano system design and precision control of machine tools.

E-mail: kbh@kangwon.ac.kr

Young Ho Seo

Professor in the Department of Mechatronics Engineering, Kangwon National University.His research interest is micro/nanoscale surface texturing technologies and their applications in various sensor systems.

E-mail: mems@kangwon.ac.kr