Controlling droplet spreading with topography
@inproceedings{Kant2017ControllingDS, title={Controlling droplet spreading with topography}, author={Pallav Kant and Andrew L. Hazel and Mark Dowling and Alice B. Thompson and Anne Juel}, year={2017} }
We present a novel experimental system that can be used to study the dynamics of picoliter droplet spreading over substrates with topographic variations. We concentrate on spreading of a droplet within a recessed stadium-shaped pixel, with applications to the manufacture of POLED displays, and find that the sloping side wall of the pixel can either locally enhance or hinder spreading depending on whether the topography gradient ahead of the contact line is positive or negative. Locally enhanced…
11 Citations
Sequential deposition of microdroplets on patterned surfaces.
- PhysicsSoft matter
- 2018
This investigation is motivated by the manufacture of polymeric organic light-emitting-diode displays, where the substrate is textured with a regular array of shallow recessed regions (pixels) that are highly wetting compared to the remainder of the substrate.
Morphologies and dynamics of micro-droplet impact onto an idealised scratch
- Materials ScienceJournal of Fluid Mechanics
- 2021
Abstract As inkjet technology develops to produce smaller droplets, substrate features such as accidental scratches or manufacturing defects can potentially affect the outcome of printing,…
Revealing How Topography of Surface Microstructures Alters Capillary Spreading
- Materials ScienceScientific Reports
- 2019
The toy model shows the mechanism by which the shape of the roughness together with the line friction determines the observed slowing down of the spreading, and the spreading speed in different directions relative to the surface pattern is found to be well described by the toy model.
Surface roughness effects on contact line motion with small capillary number
- Engineering
- 2018
In this work, we investigate how surface roughness influences contact line dynamics by simulating forced wetting in a capillary tube. The tube wall is decorated with microgrooves and is intrinsically…
Morphology of Evaporating Sessile Microdroplets on Lyophilic Elliptical Patches
- PhysicsLangmuir : the ACS journal of surfaces and colloids
- 2019
The different droplet morphologies adopted by an evaporating droplet on a surface with an elliptical patch with a different contact angle are studied and a morphology diagram in the aspect ratio vs relative volume parameter space is compared, comparing the predictions with the measurements.
The engulfment of aqueous droplets on perfectly wetting oil layers
- PhysicsJournal of Fluid Mechanics
- 2021
Abstract Place a droplet of mineral oil on water and the oil will spread to cover the water surface in a thin film. In this paper we study the everted problem: an aqueous droplet deposited onto a…
POLED displays: Robust printing of pixels
- MathematicsApplied Physics Letters
- 2019
The fabrication of a high-quality POLED (Polymeric Organic Light Emitting Diode) display requires the deposition of identical, uniform fluid films into a large number of shallow recessed regions that…
Combined Light and Electric Response of Topographic Liquid Crystal Network Surfaces
- Materials ScienceAdvanced Functional Materials
- 2019
An approach is proposed to create robust liquid crystalline polymer coatings that exhibit sensitivity and dynamic reversibility toward multiple external stimuli including UV irradiation and…
On the modelling of the transition between contact-line and microlayer evaporation regimes in nucleate boiling
- PhysicsJournal of Fluid Mechanics
- 2021
Abstract Formation of a microlayer in nucleate boiling results in substantial changes to the heat-transfer dynamics of the process, and establishing a criterion to distinguish between the microlayer…
Evaporation of a thin droplet in a shallow well: theory and experiment
- Physics, EngineeringJournal of Fluid Mechanics
- 2021
Abstract Motivated by the industrial manufacture of organic light-emitting-diode displays, we formulate and analyse a mathematical model for the evolution of a thin droplet in a shallow axisymmetric…
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