Collaborative Research: Reversible and Triggerable Self-Assembly of Photoresponsive Catanionic Vesicles

CBET-0829209李当液体在固体表面上置换另一种流体时，它与固体对向的角度称为动态接触角。它提供了对固体上的力的测量，并用于了解工艺可行性的限制。当被驱替的流体被夹带时，该极限出现。这些特征在涂料流中观察到，如在照相胶片的制造中，在孔中一种流体被另一种流体置换中，这在通过用另一种流体置换来回收原油中是重要的，以及在微电子器件中，其中液体池或连续形式的液体从一个区域移动到另一个区域。智力优势。在这里提出的建模研究中，P.I.将接近接触线区域，该动态接触角的液体楔形物取代第二流体，遵循早期的成功模型。动量平衡方程将正确求解到Re（雷诺数）阶，并将计算整个系统的粘性耗散。这是等同于表面工作完成的速度，再次遵循早期的成功模式。最终的解决方案将在作为Ca的函数的角度的形式，（毛细管数）和Re。新的特点是：（a）在大角度下建立关联，（B）建立液-液体系的关联，（c）在角度= 180°（或0°）时开始夹带，以及为什么它会从一个体系的几何形状到另一个体系的几何形状变化的原因将被建立。一个更简单的问题，在一个后退的接触线夹带也将单独研究下，不同的配方。私家侦探还将进行实验，以获得上述系统和操作范围的实验数据。更广泛的影响。这些结果将允许人们设置操作窗口，其中涂覆过程是可行的，假设该过程在夹带时失败。动态接触角还提供了系统中力平衡的估计。因此，上述相关性为处于新兴技术前沿的系统中的合理过程设计提供了非常好的基础。基本理论是直截了当的，所取得的进展也可以纳入教学中，无论是在界面现象或运输，这两个都是由PI教授的课程。以技术选修课的形式。本科生和研究生都将在实验室工作。

CBET-0829209 LeeWhen a liquid displaces another fluid on a solid surface, the angle that it subtends with the solid is called the dynamic contact angle. It provides a measure of the force on the solid and is used to understand the limits of the feasibility of the process. This limit arises when the displaced fluid gets entrained. These features are observed in coating flows as in making of photographic films, in displacement of one fluid by another in a pore which is of importance in the recovery of crude petroleum oil by displacement with another fluid, and in microelectronic devices where pools of liquid or liquid in a continuous form is moved from one region to another. Intellectual Merit. In the modeling studies proposed here, the P.I. will approximate the contact line region a liquid wedge of this dynamic contact angle displacing a second fluid following earlier successful models. The momentum balance equations will be solved correct to order of Re,(Reynolds number) and viscous dissipation will be calculated for the whole system. This is equated to the rate of surface work done, again following earlier successful model. Final solution will be in the form of the angle as a function of Ca, (capillary number) and Re. The novel features are (a) correlations at large the angle will be established, (b) correlations for liquid-liquid system will be established (c) the onset of entrainment at the angle = 180° (or at 0°), and the reasons why it may vary from one system geometry to another will be established. A simpler problem of entrainment in a receding contact line will also be studied separately under a different formulation. The P.I. will also perform experiments to obtain experimental data for the above systems and ranges of operation. Broader Impact. These results would allow one to set windows of operation where a coating process is feasible, assuming that the process fails at entrainment. Dynamic contact angles also provide estimates of force balances in the systems. Consequently, the above correlations provide a very good basis for sound process design in systems that are in the cutting edge in emerging technologies. The basic theory is straightforward and the progress that would be made can also be incorporated into teaching either in a course on interfacial phenomena or transport, both of which are taught by the P.I. in form of technical electives. Both undergraduates and graduate students will be employed in the laboratory.