ISS: Unmasking contact-line mobility for Inertial Spreading using Drop Vibration and Coalescence

国际空间站：利用液滴振动和聚结揭示惯性传播的接触线移动性

• 批准号: 1637960
• 负责人: Susan Daniel
• 金额: $ 30万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2022-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1637960&HistoricalAwards=false
• 关键词: ISS; Unmasking; contact; line; mobility

PI: Steen, PaulProposal Number: 1637960The proposed research is focused on the study of the behavior of drops pinned on a surface that vibrates. The proposal is about developing a theory to predict the drop oscillation modes and the mobilization of the drop, while conducting very careful experiments to verify the theoretical findings at microgravity conditions. The advantage of conducting experiments at the International Space Station (ISS) is to focus on cases that are affected by gravity. Results from this work can have applications on Earth in medical, manufacturing, industrial and agricultural processes. For example, one of these processes is immersion lithography - an important technique that has allowed for down-scaling in semiconductor chip manufacturing processes. Results for the proposed work could improve the process of inertial spreading, a fundamental component in immersion lithography, and reduce defects found on semiconductor manufacturing by 10% over current standards. This can potentially lead to cost savings on the order of 10% in the semiconductor industry, which is already worth several hundred billion dollars annually.Features of contact line motions that are small-scale and fast on Earth become larger and slower on the ISS, making them accessible to optical imaging there. ISS experiments are proposed to study inertial spreading. Inertial spreading is vitally important to manufacturing, coating and forming operations on Earth but challenging to study and has received less attention than viscous spreading. The experiments proposed will enable a contact line mobility parameter to be estimated. Two setups are envisioned. The first will periodically force the contact line motion of a substrate-attached drop using a mechanical shaker that drives plane normal oscillations. Using an electrowetting-based trigger, the second setup will induce a transient droplet-droplet coalescence event with consequent large sweeping by contact lines. Mobility is a material-like phenomenological parameter that captures out-of-equilibrium dynamical responses of a moving contact line. Once measured, the idea is that mobility can be used in predictions of inertial spreading in other situations. Shaker and sweeping experiments represent forced and transient contact line motions, respectively, and will demonstrate the utility of the mobility parameter. Predictions for mobile contact lines have received limited testing because contact line speeds are fast with small scale features of importance. The ISS will unmask these features and enable testing of a high-level theory of mobility of inertially-spreading contact lines. To the extent that the theory has rather striking parallels to the harmonic oscillator, to the Schroedinger equation and to the periodic table, educational impact to a broad group of students and public will accrue. Moreover, experiments can be phrased as a quest for "motion elements" using the metaphor with the periodic table of the chemical elements. The proposed education plan will teach graduate women to be competent technical leaders through the development of an outreach module that integrates the themes of the research conducted here to high school students. The long-term impact is to broaden the participation of women in STEM by developing their professional and mentoring skills, and empowering more women to pursue advanced career goals as postgraduates. A secondary impact is to continue to encourage young girls to pursue science and math in high school so that they are well-prepared and motivated to choose scientific majors in college.

PI：Steen, Paul 提案编号：1637960 拟议的研究重点是研究固定在振动表面上的水滴的行为。该提案旨在开发一种理论来预测液滴振荡模式和液滴的流动性，同时进行非常仔细的实验​​以验证微重力条件下的理论结果。在国际空间站（ISS）进行实验的优点是专注于受重力影响的情况。 这项工作的结果可以应用于地球上的医疗、制造、工业和农业过程。 例如，其中一种工艺是浸没式光刻，这是一种重要的技术，可以缩小半导体芯片制造工艺的尺寸。拟议工作的结果可以改进惯性扩散过程（浸没式光刻的基本组成部分），并将半导体制造中发现的缺陷比现行标准减少 10%。这可能会为半导体行业带来大约 10% 的成本节省，该行业每年的价值已经达到数千亿美元。地球上小规模且快速的接触线运动特征在国际空间站上变得更大且更慢，使得它们可以在国际空间站上进行光学成像。国际空间站实验旨在研究惯性扩散。惯性扩散对于地球上的制造、涂层和成型操作至关重要，但研究起来却很困难，并且比粘性扩散受到的关注较少。所提出的实验将能够估计接触线迁移率参数。设想了两种设置。第一个将使用驱动平面法向振荡的机械振动器周期性地迫使附着在基板上的液滴的接触线运动。使用基于电润湿的触发器，第二种设置将引发瞬态液滴-液滴聚结事件，并随后通过接触线进行大扫掠。移动性是一种类似材料的唯象参数，可捕获移动接触线的非平衡动态响应。一旦测量出来，流动性就可以用于预测其他情况下的惯性扩散。振动实验和扫频实验分别代表受迫接触线运动和瞬态接触线运动，并将证明迁移率参数的实用性。对移动接触线的预测受到了有限的测试，因为接触线速度很快，且重要特征较小。国际空间站将揭开这些特征，并能够测试惯性传播接触线的高级流动性理论。如果该理论与谐振子、薛定谔方程和元素周期表有相当惊人的相似之处，就会对广大学生和公众产生教育影响。此外，用化学元素周期表来比喻，实验可以被表述为对“运动元素”的探索。拟议的教育计划将通过开发一个外展模块，将这里进行的研究主题整合到高中生中，教导女研究生成为有能力的技术领导者。长期影响是通过发展女性的专业和指导技能来扩大女性对 STEM 的参与，并赋予更多女性作为研究生追求高级职业目标的能力。第二个影响是继续鼓励年轻女孩在高中学习科学和数学，以便她们为大学选择科学专业做好充分准备和动力。

项目成果

Moving contact-line mobility measured

• DOI: 10.1017/jfm.2018.105
• 发表时间: 2018-03-01
• 期刊: JOURNAL OF FLUID MECHANICS
• 影响因子: 3.7
• 作者: Xia, Yi;Steen, Paul H.
• 通讯作者: Steen, Paul H.

Droplet motions fill a periodic table

• DOI: 10.1073/pnas.1817065116
• 发表时间: 2019-03-12
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Steen, Paul H.;Chang, Chun-Ti;Bostwick, Joshua B.
• 通讯作者: Bostwick, Joshua B.

Dissipation of oscillatory contact lines using resonant mode scanning

• DOI: 10.1038/s41526-019-0093-0
• 发表时间: 2020-01-21
• 期刊: NPJ MICROGRAVITY
• 影响因子: 5.1
• 作者: Xia, Yi;Steen, Paul H.
• 通讯作者: Steen, Paul H.

Is contact-line mobility a material parameter?

• DOI: 10.1038/s41526-022-00190-y
• 发表时间: 2022-02-21
• 期刊: NPJ microgravity
• 影响因子: 5.1
• 作者: Ludwicki JM;Kern VR;McCraney J;Bostwick JB;Daniel S;Steen PH
• 通讯作者: Steen PH