Repellant 1 (video) University of Missouri-Columbia Loading video... Caption An oil droplet is pushed by air but cannot pass the boundary line of newly developed oil repellent surface. Once air flow stops, the oil droplet retracts backward from the virtually existing barrier. Credit Dr. Jae Kwon Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.