报告题目：Separation of Emulsified Oil or Ethanol from Water by Filtration and Robust Transparent Omniphobic Coatings

报告人：  Prof. Guojun Liu（Queen’s University）

报告时间：2019年12月5日（周四）上午9:30

报告地点：明故宫校区A9-506

主办单位：机械结构力学及控制国家重点实验室、科协、国际合作处、航空学院

报告内容简介：

There have been thousands of papers on the separation of oil from water using superhydrophobic large-pore filters.  The separation of emulsified oil from water using such filters is impossible once the oil droplets are smaller than the filter pores.  The separation of solvents such as ethanol that is miscible with water by filtration is not known.  In this talk, I will discuss how we achieve the high-flux separation of emulsified oil from water using a Janus filter that coalesces emulsified oil droplets and then separates selectively the coalesced oil from water.  I will also show preliminary results for the separation of ethanol from water by filtration without addition of chemicals or input of external energy.

The preparation of oil- and water-repellent omniphobic coatings normally requires the use of perfluorinated agents, which are banned in many countries.  The coatings further suffer from lack of wear resistance and optical clarity.  In this talk, I will discuss our invention - transparent omniphobic NP-GLIDE coatings, which contain in their matrices nanometer-sized pools of a grafted lubricating ingredient for de-wetting enablement. Here the de-wetting enabler is the much cheaper and environmentally more friendly poly (dimethyl siloxane). On NP-GLIDE coatings spray paint and ink facilely contract.  Further, most test liquids with surface tensions above ~ 22 mN/m have no problem to cleanly glide off.  The coating matrices that we have tested so far include polyurethanes, epoxies, acrylate polymers, engineering plastics, and polymer/inorganic hybrids.  The coatings may be cured thermally or photochemically and the formulations may be solvent- or water-based.  Additionally, the precursors may be derived from petroleum stocks or renewable resources.  While most coatings have a pencil hardness between 2H and 3H, our strongest coating has a hardness exceeding 9H, enduring wear by steel wool and being transparent and flexible at the same time.

报告人简介：

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, University of Calgary, Canada

1995 Associate Professor, University of Calgary, Canada

1999 Professor, University of Calgary, Canada

2004 Professor and Tier I Canada Research Chair, Queen’s University

Awards

Renewal of Tier I Canada Research Chair, 2018.

The Queen’s Prize for Excellence in Research, 2015.

Leading Talent, Guangdong Province, 2010 – 2014.

Renewal of Tier I Canada Research Chair in Materials Science, 2011.

Captain Alfred E. Hunt Award from the Society of Tribologists and Lubrication Engineers, 2010.

Macromolecular Science and Engineering Division Award, Chemical Institute of Canada, 2007.

Distinguished Young Investigator Award, the Chinese Academy of Sciences, 2004 – 2007.

Tier I Canada Research Chair in Materials Science, 2004.

Research Excellence Award, Faculty of Science, University of Calgary, 2000.

Distinguished Young Investigator Award, National Science Foundation of China, 1999 – 2002.

Fellowship, Iketani Science and Technology Foundation, Japan, 1997.

Faculty of Science Research Fellowship, University of Calgary, 1998.