Droplet Interaction Force
Droplet Interaction Force - Related Videos
07:18
Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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2019
The protocol aims to investigate the interaction between droplets and super-hydrophobic substrates in the air. This includes calibrating the measurement system and measuring the interaction force at super-hydrophobic substrates with different grid fractions.
05:57
Biomembrane Force Probe to Quantitate Receptor-Ligand Interactions
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2025
In this video, biomembrane force probes (BFPs) are used to measure the forces between receptors and ligands. This technique can detect interactions by monitoring the pressure needed to break the bonds between the pMHC conjugated on the probe beads and the TCRs on the target cells.
03:04
Atomic Force Microscopy to Visualize Phage–Antigen Interactions
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2026
Source: Williams, S. M. et al. Novel Atomic Force Microscopy Based Biopanning for Isolation of Morphology Specific Reagents against TDP-43 Variants in Amyotrophic Lateral Sclerosis. J. Vis. Exp. (2015)This video demonstrates tapping-mode AFM to visualize phage–antigen interactions on a mica surface. It outlines the steps for antigen immobilization, phage binding, and high-resolution nanoscale imaging.
04:56
Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown
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2025
This protocol employs dual-trap optical tweezers to measure inter-droplet forces in real time during the enzymatic digestion of emulsions. It facilitates the study of emulsion stability and droplet dynamics, with applications in food science and pharmaceuticals.
03:13
Intermolecular Forces
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2020
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
FAQs
Inertia and viscous stresses govern how quickly droplets move and deform during an encounter, while surface tension resists the resulting shape change. Their competition determines whether a droplet remains distorted, continues toward contact, or recovers its shape. Engineering analyses therefore consider these contributions together rather than treating droplet motion or deformation as an isolated effect.
A thin liquid film between approaching droplets acts as a lubricating layer. The resulting lubrication force can slow their approach, delaying contact and, in some cases, preventing coalescence altogether. This film is therefore a key variable when interpreting why apparently similar encounters may produce different outcomes, especially in models of multiphase flow.
The outcome reflects the balance among motion, deformation, surface-tension resistance, and lubrication effects in the intervening film. Strong deformation may accompany collision, yet the droplets can still remain distinct if the film delays contact. Alternatively, conditions may allow coalescence or separation. Identifying this balance helps engineers interpret collision outcomes and predict multiphase flow behavior.
Engineers investigate these interactions by measuring forces or by modeling the mechanical behavior of approaching, colliding, deforming, coalescing, or separating droplets. The resulting information supports predictions of droplet motion, deformation, and collision outcome. Using measurement and modeling together can help connect observed interactions with the behavior expected in engineered multiphase systems.
The forces matter wherever droplets meet or move through a process, including sprays, emulsions, microfluidic systems, inkjet printing, and coating operations. In each setting, interactions can influence droplet size, transport, collision behavior, or coalescence. Understanding those effects helps engineers evaluate and control how liquid droplets behave within the larger process.
Force measurements and models provide information needed to control droplet size, collision outcomes, transport, and product uniformity. This is especially relevant when repeated droplet interactions shape the quality of a spray, emulsion, printed pattern, or coating. Relating mechanical interaction behavior to these process outcomes gives engineering studies a practical basis for improving consistency.