Multi-ring Deposition Pattern of Drying Droplets.

@article{Wu2018MultiringDP,
  title={Multi-ring Deposition Pattern of Drying Droplets.},
  author={Mengmeng Wu and Xingkun Man and Masao Doi},
  journal={Langmuir : the ACS journal of surfaces and colloids},
  year={2018},
  volume={34 32},
  pages={
          9572-9578
        }
}
We propose a theory for the multi-ring pattern of the deposits that are formed when droplets of the suspension are dried on a substrate. Assuming a standard model for the stick-slip motion of the contact line, we show that as droplets evaporate many concentric rings of deposits are formed but are taken over by a solid-circle pattern in the final stage of drying. An analytical expression is given to indicate when the ring pattern changes to a solid-circle pattern during the evaporation process… 

Figures from this paper

Drying Droplets with Soluble Surfactant.

It is shown that the added surfactant hinders droplet receding and facilitates the droplet spreading, causing complex behavior of the contact line of an evaporating droplet, which first recedes and then advances and finally recedes again.

Formation of deposition patterns induced by the evaporation of the restricted liquid.

A theoretical model is developed based on the Onsager principle to reveal the physical mechanisms behind the multi-ring phenomena, which finds that the ring spacing decays exponentially from center to edge experimentally and theoretically.

Deposition pattern of drying droplets

The drying of liquid droplets is a common daily life phenomenon that has long held a special interest in scientific research. When the droplet includes nonvolatile solutes, the evaporation of the

Patterning of colloids into spirals via confined drying.

It is reported that the drying of charge stabilized colloidal dispersions between two parallel plates is a route to intriguing self-assembly patterns when the dispersions are dried in parallel plate confinement, particles deposit as spiral patterns after the complete evaporation of the solvent irrespective of the confinement spacing.

Ring patterns generated by an expanding colloidal meniscus.

It is suggested that free ligands are the main cause of the Marangoni instabilities driving the periodic vorticity in the meniscus, and the usually ignored contact line tension may yield a considerable contribution to the CL pinning causing the CL slip-stick motion and the ring formation.

Morphological Control of Linear Particle Deposits from the Drying of Inkjet-Printed Rivulets.

The main result is that stable rivulets could be formed by controlled drop overlap leading, after drying, to the formation of three continuous and parallel lines composed of a single layer of self-assembled particles.

The contact angle of an evaporating droplet of a binary solution on a super wetting surface.

Under certain conditions, it is found that the contact angle remains constant over a certain period of time during evaporation and how the plateau or peak contact angle depends on the initial composition and the humidity is studied.

Tuning Contact Line Dynamics and Deposition Patterns in Volatile Liquid Mixtures.

It is shown that the addition of a miscible, nonvolatile liquid can strongly alter the contact line dynamics and the final liquid deposition pattern in two distinct regimes depending on the relative strength of solutal Marangoni forces and surface wetting.

Control of the Drying Patterns for Complex Colloidal Solutions and Their Applications

The uneven deposition at the edges of an evaporating droplet, termed the coffee-ring effect, has been extensively studied during the past few decades to better understand the underlying cause, namely

References

SHOWING 1-10 OF 39 REFERENCES

Pattern formation in drying drops

  • Deegan
  • Physics
    Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
  • 2000
The drop itself can generate one of the essential conditions for ring formation to occur: contact line pinning, and it is shown that when self-induced pinning is the only source of pinning an array of patterns-that include cellular and lamellar structures, sawtooth patterns, and Sierpinski gaskets-arises from the competition between dewetting and contact linePinning.

Ring to Mountain Transition in Deposition Pattern of Drying Droplets.

A theory is proposed that predicts the deposit distribution based on a model of fluid flow and the contact line motion of the droplet that shows that the deposition pattern changes continuously from a coffee ring to volcanolike and to mountainlike depending on the mobility of thecontact line and the evaporation rate.

Deposition Patterns of Two Neighboring Droplets: Onsager Variational Principle Studies.

It is demonstrated that the gradients of evaporation rate along two droplets is the main reason for forming asymmetrical deposition patterns, and the velocities of solute particles have no cylindrical symmetry anymore because of the asymmetrical evporation rate.

Surface Morphology of Drying Latex Films: Multiple Ring Formation

When a drop of aqueous solution containing suspended particles dries, particles accumulate at the contact line. Often the contact line undergoes a sequence of pinning−depinning events with particles

Self-assembly of gradient concentric rings via solvent evaporation from a capillary bridge.

The nature of the formation of regular gradient ring patterns during the course of irreversible solvent evaporation is revealed through theoretical calculations based on the mass conservation of the solution.

Stripe patterns formed on a glass surface during droplet evaporation

When a suspension droplet dries on a glass surface, particles collect near the edge of the droplet boundary (contact line) and often leave a striped pattern as the droplet evaporates. During drying,

Vapor-Induced Motion of Liquid Droplets on an Inert Substrate.

It is shown that the droplet motion can be induced even in the absence of the Marangoni effect due to the gradient of the evaporation rate, which explains the previously observed attraction-repulsion-chasing behaviors of evaporating droplets.

Dynamical model for the formation of patterned deposits at receding contact lines.

A dynamical model based on a long-wave approximation predicts the deposition of irregular and regular line patterns due to self-organized pinning-depinning cycles corresponding to a stick-slip motion of the contact line.

Interference Effects in the Drying of Polymer Droplets on Substrate

Drying processes of many droplets of polymer solution placed on a solid substrate are studied numerically. A coupled equations for the flow of liquid in the droplets and the diffusion of solvent in

A model for pattern deposition from an evaporating solution subject to contact angle hysteresis and finite solubility.

This model takes into account the three-phase contact angle hysteresis and the deposition of the solute whenever its concentration exceeds the solubility limit, and replaces an exact geometric description of the vicinity of the contact line with general insights about the concentration and its flux.