Elastocapillary Dynamics During Wetting and Drying of Sheets and Fibers

片材和纤维润湿和干燥过程中的弹性毛细管动力学

• 批准号: 1132835
• 负责人: Howard Stone
• 金额: $ 27.75万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1132835&HistoricalAwards=false
• 关键词: Elastocapillary; Dynamics; During; Wetting; Drying

1132835StoneSurface tension plays a role in many industrial problems and natural phenomena; many of these involve significant elastic effects of the basic materials such as the surrounding substrates and/or porous matrices, e.g. textiles, hair, and filters are just some of the soft materials that readily change shape (and possibly function) when wet or dried. Although static problems involving the interplay between surface tension (capillarity), elasticity, and possibly other forces are well studied, there are very few studies of the dynamics of elastocapillarity, which is the subject of this proposal. Because of the breadth of applications that involve elastocapillary dynamics, spanning material science, and the biological and environmental sciences, we believe that this research area will yield new insights and applications. The research in this proposal is focused on characterizing, both experimentally and theoretically, two common geometries - sheets and fibers - and two common dynamical situations - spontaneous wetting and drying. In addition, we will study the dynamics of wetting and drying of a model soft porous material consisting of a fibrous matrix. In this way, we will provide a systematic, yet broad characterization of the dynamics of elastocapillary flow problems. The research described in this proposal may yield new insights such as whether there is an optimum drop size for wetting a fibrous medium and how the drying rate of a fibrous medium is influenced by the softness (elasticity) of the fibers.Broader impacts: In addition to publishing our findings in journals that span engineering, physics, and materials science, the PI will continue his multi-faceted outreach activities, including hosting visitors from different disciplines and educational institutions, engaging undergraduate students in research and giving talks at conferences, leading professional development activities for undergraduate, graduate, and postdoctoral colleagues, and participating in mentoring programs for young researchers from under-represented groups. Also, the PI has successfully incorporated research themes into "holiday" lectures for children and parents that he has given over the past 9 years and which he will continue to develop and present. Overall, the research will have a direct impact on our understanding of wetting and drying of common soft fibrous materials, which arises in a wide variety of industrial and natural systems.

1132835石表面张力在许多工业问题和自然现象中起作用;其中许多涉及基本材料的显著弹性效应，例如周围的基材和/或多孔基质，例如纺织品，头发和过滤器只是一些在潮湿或干燥时容易改变形状（和可能的功能）的软材料。 虽然静态的问题，涉及表面张力（毛细作用），弹性，并可能其他力量之间的相互作用进行了很好的研究，有很少的研究弹性毛细作用的动态，这是本建议的主题。由于涉及弹性毛细管动力学，跨越材料科学，生物和环境科学的应用范围，我们相信这一研究领域将产生新的见解和应用。在这个建议的研究集中在表征，实验和理论上，两个常见的几何形状-片材和纤维-和两个常见的动态情况-自发润湿和干燥。此外，我们将研究由纤维基质组成的模型软多孔材料的润湿和干燥的动力学。通过这种方式，我们将提供一个系统的，但广泛的弹性毛细血管流动问题的动态特性。该建议中描述的研究可能产生新的见解，例如是否存在用于润湿纤维介质的最佳液滴尺寸以及纤维介质的干燥速率如何受柔软度的影响更广泛的影响：除了在工程、物理和材料科学期刊上发表我们的研究结果外，PI还将继续开展多方面的外联活动，包括接待来自不同学科和教育机构的来访者，让本科生参与研究并在会议上发表演讲，领导本科生，研究生和博士后同事的专业发展活动，并参与指导来自代表性不足群体的年轻研究人员的计划。此外，PI成功地将研究主题纳入了他在过去9年中为儿童和家长举办的“假日”讲座，他将继续发展和介绍。总的来说，这项研究将直接影响我们对常见软纤维材料的润湿和干燥的理解，这些材料在各种工业和自然系统中出现。