{"title":"Self-Directed Movements of Droplets on Radially Patterned Surfaces Based on Self-Assembled Monolayers","authors":"H. Khoo, F. Tseng","doi":"10.1109/MMB.2006.251548","DOIUrl":null,"url":null,"abstract":"This paper demonstrates macroscopic (millimetre-scale), self-directed transport of droplets on radially patterned silicon surfaces to induce wettability gradients based on self-assembled monolayers (SAMs). A difference in wettability between the opposite sides of the droplet edge creates a Laplace pressure gradient inside the droplet, forcing the droplet to move forward. Circulating wedge-shaped features with alternate hydrophobic and hydrophilic regions were photographically patterned and combined with selective coating of silanol- and thiol-based SAMs to transport the droplets right to the centre passively. Positions and velocities of the droplets were measured using high speed CCD camera","PeriodicalId":170356,"journal":{"name":"2006 International Conference on Microtechnologies in Medicine and Biology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2006-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2006 International Conference on Microtechnologies in Medicine and Biology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MMB.2006.251548","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
This paper demonstrates macroscopic (millimetre-scale), self-directed transport of droplets on radially patterned silicon surfaces to induce wettability gradients based on self-assembled monolayers (SAMs). A difference in wettability between the opposite sides of the droplet edge creates a Laplace pressure gradient inside the droplet, forcing the droplet to move forward. Circulating wedge-shaped features with alternate hydrophobic and hydrophilic regions were photographically patterned and combined with selective coating of silanol- and thiol-based SAMs to transport the droplets right to the centre passively. Positions and velocities of the droplets were measured using high speed CCD camera