Related Experiment Video
Updated: Mar 4, 2026
11:08
Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
Published on: July 3, 2018
8.2K
Surface-dependent scenarios for dissolution-driven motion of growing droplets
Stefano Curiotto1, Frédéric Leroy2, Fabien Cheynis2
1Aix Marseille Univ, CNRS, CINaM, Marseille, France. curiotto@cinam.univ-mrs.fr.
Scientific Reports
|April 21, 2017
Summary
Substrate properties like orientation and surface pits significantly influence nano-droplet motion during alloy formation. Understanding these dynamics is crucial for applications like nanowire catalyst positioning.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Nano-droplets on foreign substrates are key for applications like nanowire catalysis.
- Droplet motion can occur due to reactions with the substrate, impacting their utility.
Purpose of the Study:
- To investigate how substrate characteristics influence nano-droplet dynamics.
- To elucidate the interfacial mechanisms governing alloy formation and droplet motion.
Main Methods:
- In-situ experiments using low-energy electron microscopy (LEEM).
- Study of gold (Au) droplets on silicon (Si) and germanium (Ge) model systems.
Main Results:
- Substrate orientation, surface morphology, and pit shape dictate droplet motion.
- A single mechanism (droplet-induced substrate dissolution) results in diverse droplet dynamics.
- Observed interplay between substrate defects and droplet movement.
Conclusions:
- Substrate etching anisotropy significantly affects droplet-substrate interactions.
- Understanding these interfacial mechanisms is vital for controlling liquid alloy droplet positioning for nanowire growth.
Related Concept Videos
01:15Theories of Dissolution: Diffusion Layer Model
2.0K
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
2.0K
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
882
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
882
02:28Intermolecular Forces in Solutions
40.5K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
40.5K
01:29The Colloidal State
28
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
28
01:22Surface Tension of Fluid
1.8K
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...
1.8K
01:07Cohesion
60.2K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
On a...
60.2K