Liquid spreading along nanostructured superhydrophilic lanes

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Seungho Kim ◽  
Myoung-Woon Moon ◽  
Ho-Young Kim
Keyword(s):  
Liquid Spreading

Three-Dimensional Maskless Fabrication of Bionic Unidirectional Liquid Spreading Surfaces Using a Phase Spatially Shaped Femtosecond Laser

2021 ◽  
Vol 13 (11) ◽  
pp. 13781-13791
Author(s):  
Xiaozhe Chen ◽  
Xin Li ◽  
Pei Zuo ◽  
MiSheng Liang ◽  
Xiaojie Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Three Dimensional ◽  
Liquid Spreading

Droplet spreading and absorption on rough, permeable substrates

2015 ◽  
Vol 784 ◽  
pp. 465-486 ◽  
Author(s):  
Leonardo Espín ◽  
Satish Kumar
Keyword(s):  
Surface Roughness ◽  
Contact Line ◽  
Nonlinear Evolution ◽  
Precursor Film ◽  
Radial Coordinate ◽  
Droplet Spreading ◽  
Liquid Spreading ◽  
Line Region ◽  
Influence Of Substrate ◽  
Contact Line Pinning

Wetting of permeable substrates by liquids is an important phenomenon in many natural and industrial processes. Substrate heterogeneities may significantly alter liquid spreading and interface shapes, which in turn may alter liquid imbibition. A new lubrication-theory-based model for droplet spreading on permeable substrates that incorporates surface roughness is developed in this work. The substrate is assumed to be saturated with liquid, and the contact-line region is described by including a precursor film and disjoining pressure. A novel boundary condition for liquid imbibition is applied that eliminates the need for a droplet-thickness-dependent substrate permeability that has been employed in previous models. A nonlinear evolution equation describing droplet height as a function of time and the radial coordinate is derived and then numerically solved to characterize the influence of substrate permeability and roughness on axisymmetric droplet spreading. Because it incorporates surface roughness, the new model is able to describe the contact-line pinning that has been observed in experiments but not captured by previous models.

Liquid Spreading Induced by In Situ Generation of Metallic Nanoparticles

Langmuir ◽  
2020 ◽  
Vol 36 (41) ◽  
pp. 12237-12246
Author(s):  
Nitish Singh ◽  
Yashaswini Jain ◽  
Kaushal Kishore ◽  
Animangsu Ghatak
Keyword(s):  
Metallic Nanoparticles ◽  
Liquid Spreading ◽  
In Situ Generation

scholarly journals Surface-Tension-Confined Channel with Biomimetic Microstructures for Unidirectional Liquid Spreading

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 978
Author(s):  
Yi Zhang ◽  
Yang Gan ◽  
Liwen Zhang ◽  
Deyuan Zhang ◽  
Huawei Chen
Keyword(s):  
Surface Tension ◽  
Underlying Mechanism ◽  
Structural Features ◽  
Liquid Motion ◽  
Water Separation ◽  
Lab On Chip ◽  
Liquid Spreading ◽  
Oil Water Separation ◽  
On Chip ◽  
The Stability

Unidirectional liquid spreading without energy input is of significant interest for the broad applications in diverse fields such as water harvesting, drop transfer, oil–water separation and microfluidic devices. However, the controllability of liquid motion and the simplification of manufacturing process remain challenges. Inspired by the peristome of Nepenthes alata, a surface-tension-confined (STC) channel with biomimetic microcavities was fabricated facilely through UV exposure photolithography and partial plasma treatment. Perfect asymmetric liquid spreading was achieved by combination of microcavities and hydrophobic boundary, and the stability of pinning effect was demonstrated. The influences of structural features of microcavities on both liquid spreading and liquid pinning were investigated and the underlying mechanism was revealed. We also demonstrated the spontaneous unidirectional transport of liquid in 3D space and on tilting slope. In addition, through changing pits arrangement and wettability pattern, complex liquid motion paths and microreactors were realized. This work will open a new way for liquid manipulation and lab-on-chip applications.

Liquid spreading on superhydrophilic micropillar arrays

2011 ◽  
Vol 680 ◽  
pp. 477-487 ◽  
Author(s):  
SEONG JIN KIM ◽  
MYOUNG-WOON MOON ◽  
KWANG-RYEOL LEE ◽  
DAE-YOUNG LEE ◽  
YOUNG SOO CHANG ◽  
...  
Keyword(s):  
Power Law ◽  
Early Stage ◽  
Bulk Flow ◽  
Bottom Part ◽  
Liquid Spreading ◽  
Starting Point ◽  
Micropillar Array ◽  
Micropillar Arrays ◽  
Superhydrophilic Surfaces

When a drop is deposited on a superhydrophilic micropillar array, the upper part of the drop (referred to as the bulk) collapses while the bottom part penetrates into the gaps of the array, forming a fringe film. Here we quantify the early stage dynamics of this process using a combination of experiment and theory. We show that the circular front of the fringe film spreads like t1/2, t being time, when coupled to the bulk flow. However, the film is found to advance like t1/3 through faceted zippering in the absence of the bulk. We then show that the spreading of the bulk and the entire drop footprint follows a power law (t1/4) that is different from Washburn's law. This work can be a starting point to completely understand the spreading of liquids on superhydrophilic surfaces and opens questions specific to superwetting behaviour including the criteria to determine whether the fringe film will expand through lateral zipping or advance radially outwards.

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