报告题目：Separation of Emulsified Oil orEthanol from Water by Filtration and Robust Transparent Omniphobic Coatings
报告人： Prof. Guojun Liu(Queen’s University)
There have been thousands of papers on theseparation of oil from water using superhydrophobic large-pore filters. The separation of emulsified oil from waterusing such filters is impossible once the oil droplets are smaller than thefilter pores. The separation of solventssuch as ethanol that is miscible with water by filtration is not known. In this talk, I will discuss how we achievethe high-flux separation of emulsified oil from water using a Janus filter thatcoalesces emulsified oil droplets and then separates selectively the coalescedoil from water. I will also showpreliminary results for the separation of ethanol from water by filtrationwithout addition of chemicals or input of external energy.
The preparation of oil- and water-repellent omniphobic coatingsnormally requires the use of perfluorinated agents, which are banned in manycountries. The coatings further sufferfrom lack of wear resistance and optical clarity. In this talk, I will discuss our invention - transparentomniphobic NP-GLIDE coatings, which contain in their matrices nanometer-sized pools of a grafted lubricating ingredient for de-wettingenablement. Here the de-wettingenabler is the much cheaper and environmentally more friendly poly (dimethylsiloxane). On NP-GLIDE coatings spray paint and ink facilely contract. Further, most test liquids with surfacetensions above ~ 22 mN/m have no problem to cleanly glide off. The coating matrices that we have tested sofar include polyurethanes, epoxies, acrylate polymers, engineering plastics,and polymer/inorganic hybrids. Thecoatings may be cured thermally or photochemically and the formulations may besolvent- or water-based. Additionally,the precursors may be derived from petroleum stocks or renewableresources. While most coatings have apencil hardness between 2H and 3H, our strongest coating has a hardnessexceeding 9H, enduring wear by steel wool and being transparent and flexible atthe same time.
Education & Academic Background
1982 B.Sc., Department of Chemistry,Nankai University, China
1985 M.Sc., Department of Chemistry,University of Toronto, Canada
1989 Ph.D., Department of Chemistry,University of Toronto, Canada
1989-90 PDF, McGill University, Canada
1990 Assistant Professor, Universityof Calgary, Canada
1995 Associate Professor, Universityof Calgary, Canada
1999 Professor, University of Calgary,Canada
2004 Professor and Tier I CanadaResearch Chair, Queen’s University
Renewal of TierI Canada Research Chair, 2018.
The Queen’s Prize for Excellence inResearch, 2015.
Leading Talent, Guangdong Province,2010 – 2014.
Renewal of Tier I Canada ResearchChair in Materials Science, 2011.
Captain Alfred E. Hunt Award from theSociety of Tribologists and Lubrication Engineers, 2010.
Macromolecular Science and EngineeringDivision Award, Chemical Institute of Canada, 2007.
Distinguished Young InvestigatorAward, the Chinese Academy of Sciences, 2004 – 2007.
Tier I Canada Research Chair inMaterials Science, 2004.
Research Excellence Award, Faculty ofScience, University of Calgary, 2000.
Distinguished Young InvestigatorAward, National Science Foundation of China, 1999 – 2002.
Fellowship, Iketani Science andTechnology Foundation, Japan, 1997.
Faculty of Science ResearchFellowship, University of Calgary, 1998.