Related Experiment Video
Updated: Apr 21, 2026
07:23
Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
Published on: November 14, 2025
586
Surface fluctuations of liquids confined on flat and patterned solid substrates.
Basile Pottier1, Emilie Verneuil1, Laurence Talini1
1UPMC, CNRS, ESPCI Paris-Tech, UMR 7615, Laboratoire SIMM, 10 rue Vauquelin, F-75231 Paris Cedex 05, France.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 30, 2014
Summary
Surface fluctuations in thin oil films slow down as thickness decreases. Substrate patterning locally alters these fluctuations, making them anisotropic, but the averaged spectrum remains isotropic.
Area of Science:
- Fluid dynamics
- Surface science
- Optical physics
Background:
- Understanding thin liquid film dynamics is crucial in various applications.
- Surface fluctuations play a key role in the stability and behavior of these films.
- Previous theoretical models predicted thickness-dependent dynamics.
Purpose of the Study:
- To experimentally measure surface fluctuations in micron-thick oil films.
- To investigate the impact of patterned substrates on these fluctuations.
- To compare experimental results with existing theoretical predictions.
Main Methods:
- Utilized a novel optical technique employing laser beam deflection to measure local surface slope.
- Studied oil films on both flat and rectangularly patterned solid substrates.
- Analyzed fluctuation dynamics across varying film thicknesses.
Main Results:
- Observed a slowdown in fluctuation dynamics as oil film thickness decreased on flat substrates, matching theoretical predictions.
- Demonstrated that substrate patterning modifies surface fluctuations for film thicknesses below the probed wavelength.
- Found that fluctuations exhibit periodic spectral variations and local anisotropy over the patterned substrate.
- Confirmed that the spatially averaged fluctuation spectrum remains isotropic despite local anisotropy.
Conclusions:
- Experimental data quantitatively validates theoretical predictions for flat substrates.
- Substrate topography significantly influences thin film surface fluctuations at small scales.
- Local anisotropy induced by patterns averages out, preserving overall isotropy.
More Related Videos
11:14A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
Published on: January 10, 2017
10.8K
08:36Creating Two-Dimensional Patterned Substrates for Protein and Cell Confinement
Published on: September 6, 2011
12.2K
Related Concept Videos
01:22Surface Tension of Fluid
1.9K
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
1.9K
01:19Capillarity in Fluid
1.5K
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
1.5K
02:57Surface Tension, Capillary Action, and Viscosity
28.5K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
28.5K
01:02Fluid Pressure over Flat Plate of Variable Width
1.6K
When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
1.6K
01:20Characteristics of Fluids
7.2K
When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
7.2K
01:05Fluid Pressure over Flat Plate of Constant Width
1.8K
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
The resultant force...
1.8K