SURFACE FOR DIRECTIONAL FLUID TRANSPORT INCLUDING AGAINST EXTERNAL PRESSURE

A capillary structure for passive, directional fluid transport, includes a capillary having a forward direction and a backward direction extending in an x-y plane and a depth extending in a z-direction, the capillary including first and second capillary units each having a diverging section having a backward end, a forward end, and a width in the y-direction, wherein the width increases from the backward end to the forward end, wherein the backward end of the second capillary unit diverging section is connected to the forward end of the first capillary unit diverging section to form a transition section having a step decrease in width from the forward end of the first capillary unit diverging section to the backward end of the second capillary unit diverging section, and wherein the depthin the transition section is less than the depth in each diverging section. 本发明提供了一种用于被动定向流体输送的毛细管结构，其包括：毛细管，所述毛细管具有在x-y平面中延伸的前向方向和后向方向以及在z方向上延伸的深度，所述毛细管包括第一毛细管单元和第二毛细管单元，每个所述毛细管单元具有分叉部分，所述分叉部分具有后端、前端和y方向上的宽度，其中所述宽度从所述后端到所述前端