Woonbong Hwang
Woonbong Hwang, Ph.D.
Professor and Head
Dept. of Mechanical Engineering
POSTECH, Pohang, 37673 Republic of Korea
Phone: 82-54-279-2174
Fax: 82-54-279-5899
home page: http://nscs.postech.ac.kr
Email: whwang@postech.ac.kr
Biography:
Woonbong Hwang received the B.S. degree in precision mechanical engineering from Hanyang University, Seoul, Korea in 1982 and the M.S. and Ph. D. degrees in mechanical engineering from SUNY at Buffalo, Buffalo, NY in 1985 and 1988, respectively. In 1988, he joined the Department of Mechanical Engineering at Pohang University of Science and Technology (POSTECH), Korea where he is currently a full professor and head of the department. He also leads the NSCS Research Group. In 2012 he was invited by Chinese Government as an expert of ‘1000 Plan’ and is director of Micro-Nano Technology Laboratory at China Academy of machinery Science and Technology (CAM), China. From 2000 to 2001, he was a Visiting Scholar at the Digital Appliance Research Lab. in LG Electronics Inc. From 2009 to 2010, he was a Visiting Professor at the Mechanical Engineering Department of Drexel University, USA. Since 2002, he has helped academic programs in creative engineering including axiomatic design and TRIZ. He has published more than 200 papers in internationally renowned journals and conference proceedings. His research interests include composite materials, RF-integrated mechanical structures and nanomechanics.
Abstract:
From Superhydrophilicity to Superhydrophobicity: Fabrication and Applications
Nano-engineered surfaces on various metal such as aluminum, copper & stainless steel were fabricated and investigated for superhydrophilicity or superhydrophobicity. The fabrication methods and applications of superhydrophilic/superhydrophobic surface with nano-engineered surfaces are presented.
* Fabrication methods
To make superhydrophilic/superhydrophobic surface, morphology of surface and its surface energy are important. In case of aluminum, nano-engineered surfaces, such as nanohoneycomb, nanofiber, and nanoflake are fabricated by dipping method which is applicable to any size, shape and suitable for mass production. This surface has superhydrophilicity, however, by coating the surface with polymer, which has low surface energy, superhydrophobic surface can be obtained. Superhydrophilic/superhydrophobic surface on other materials, such as copper, stainless steel and others can be fabricated by similar method.
* Applications of nanostructures
Through the superhydrophilic/superhydrophobic surfaces with nano-engineered structure, we developed transparent self-cleaning superhydrophobic surface and nanofilter for immune rejection. In addition, we have investigated drag reduction, antifungal effect, and anti-frosting/ defrosting behavior on the superhydrophobic surface. Based on nano-engineered surface, superhydrophobic heat exchanger used in air-conditioner and refrigerator, is developed and fabricated successfully. Furthermore, we designed a patterning method for superhydrophilic and superhydrophobic surface, as a result, a liquid handler is developed for precise liquid injection. Moreover, the superhydrophilic/superhydrophobic aluminum mesh which enables selective separation of oil and water is also developed.
Professor and Head
Dept. of Mechanical Engineering
POSTECH, Pohang, 37673 Republic of Korea
Phone: 82-54-279-2174
Fax: 82-54-279-5899
home page: http://nscs.postech.ac.kr
Email: whwang@postech.ac.kr
Biography:
Woonbong Hwang received the B.S. degree in precision mechanical engineering from Hanyang University, Seoul, Korea in 1982 and the M.S. and Ph. D. degrees in mechanical engineering from SUNY at Buffalo, Buffalo, NY in 1985 and 1988, respectively. In 1988, he joined the Department of Mechanical Engineering at Pohang University of Science and Technology (POSTECH), Korea where he is currently a full professor and head of the department. He also leads the NSCS Research Group. In 2012 he was invited by Chinese Government as an expert of ‘1000 Plan’ and is director of Micro-Nano Technology Laboratory at China Academy of machinery Science and Technology (CAM), China. From 2000 to 2001, he was a Visiting Scholar at the Digital Appliance Research Lab. in LG Electronics Inc. From 2009 to 2010, he was a Visiting Professor at the Mechanical Engineering Department of Drexel University, USA. Since 2002, he has helped academic programs in creative engineering including axiomatic design and TRIZ. He has published more than 200 papers in internationally renowned journals and conference proceedings. His research interests include composite materials, RF-integrated mechanical structures and nanomechanics.
Abstract:
From Superhydrophilicity to Superhydrophobicity: Fabrication and Applications
Nano-engineered surfaces on various metal such as aluminum, copper & stainless steel were fabricated and investigated for superhydrophilicity or superhydrophobicity. The fabrication methods and applications of superhydrophilic/superhydrophobic surface with nano-engineered surfaces are presented.
* Fabrication methods
To make superhydrophilic/superhydrophobic surface, morphology of surface and its surface energy are important. In case of aluminum, nano-engineered surfaces, such as nanohoneycomb, nanofiber, and nanoflake are fabricated by dipping method which is applicable to any size, shape and suitable for mass production. This surface has superhydrophilicity, however, by coating the surface with polymer, which has low surface energy, superhydrophobic surface can be obtained. Superhydrophilic/superhydrophobic surface on other materials, such as copper, stainless steel and others can be fabricated by similar method.
* Applications of nanostructures
Through the superhydrophilic/superhydrophobic surfaces with nano-engineered structure, we developed transparent self-cleaning superhydrophobic surface and nanofilter for immune rejection. In addition, we have investigated drag reduction, antifungal effect, and anti-frosting/ defrosting behavior on the superhydrophobic surface. Based on nano-engineered surface, superhydrophobic heat exchanger used in air-conditioner and refrigerator, is developed and fabricated successfully. Furthermore, we designed a patterning method for superhydrophilic and superhydrophobic surface, as a result, a liquid handler is developed for precise liquid injection. Moreover, the superhydrophilic/superhydrophobic aluminum mesh which enables selective separation of oil and water is also developed.