Superhydrophobic, Superslippery, Nanopatterned Metallic and Polymeric Surfaces

超疏水、超滑、纳米图案金属和聚合物表面

• 批准号: 121459-2013
• 负责人: Hatzikiriakos, SavvasG
• 金额: $ 3.21万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638036
• 关键词: Superhydrophobic; Superslippery; Nanopatterned; Metallic; Polymeric

The goals of this research proposal are the development of a fast production technique using laser femtosecond ablation for nanopatterning various metallic and polymeric substrates and the optimization of the morphology of metallic and polymeric surfaces in order to identify the optimum surface morphology that results maximum superhydrophobicity and superoleophobicity. Our previous developments in the area of manufacturing superhydrophobic substrates were slow and inefficient in scanning relatively large areas, and these are needed to demonstrate potential applications i.e. construction of flow channels with superslippery interfaces, biomedical devices and tools such as surgical tools. The method developed in our lab is a new method for surface roughening, essentially is ablation with short-pulse laser on metals and tough polymers (Kietzig et al., Langmuir, 2009). Exposure of the surface to CO2 renders the surface superhydrophobic, a remarkable discovery. The main objective to make this manufacturing technique faster by laser splitting so that we can produce substrates of relatively large areas. Such interfaces are self-cleaning and extremely useful in medical devices and tools whereas superhydrophobic polymers are biocompatible with human tissues and therefore the targeted application will be in the biomedical engineering field such as surgical tools, medical implants, and blood vessel replacement. Another application equally important and part of this proposal is polymer rheology and processing where the use of superhydrophobic surfaces for the construction of dies are expected to render polymer operations extremely efficient in both the rate of production and energy consumption. As known, polymer processes exhibit many instabilities that limit the rate of production to low rates. Such nanopatterned interfaces would change dramatically the boundary conditions applicable to their flow (super-slippery) dramatically reducing the pressure drop. However, the relationship between superhydrophobicity and slip is not known. Moreover, depending on the molecular characteristics of polymeric and other fluids, the characteristics length scales that maximize slip and thus minimise resistance to flow should be optimized as such interrelationships are not known.

该研究计划的目标是开发一种使用激光飞秒烧蚀的快速生产技术，用于对各种金属和聚合物基材进行纳米图案化，并优化金属和聚合物表面的形态，以确定产生最大超疏水性和超疏油性的最佳表面形态。我们之前在制造超疏水基材领域的进展在扫描相对较大的区域时速度缓慢且效率低下，需要这些来展示潜在的应用，即构建具有超滑界面的流道、生物医学设备和手术工具等工具。我们实验室开发的方法是一种表面粗糙化的新方法，本质上是用短脉冲激光对金属和坚韧聚合物进行烧蚀（Kietzig et al., Langmuir, 2009）。将表面暴露于二氧化碳会使表面变得超疏水，这是一个了不起的发现。主要目标是通过激光分裂使这种制造技术更快，以便我们可以生产相对较大面积的基板。这种界面具有自清洁性，在医疗设备和工具中非常有用，而超疏水聚合物与人体组织具有生物相容性，因此目标应用将在生物医学工程领域，例如手术工具、医疗植入物和血管置换。该提案的另一个同样重要的应用是聚合物流变学和加工，其中使用超疏水表面来构建模具预计将使聚合物操作在生产率和能源消耗方面都变得极其高效。众所周知，聚合物工艺表现出许多不稳定性，将生产速率限制在低速率。这种纳米图案界面将极大地改变适用于其流动的边界条件（超滑），从而显着降低压降。然而，超疏水性和滑移之间的关系尚不清楚。此外，根据聚合物和其他流体的分子特性，应优化使滑移最大化并从而最小化流动阻力的特性长度尺度，因为这种相互关系是未知的。