Controlling Marangoni flow directionality: patterning nano-materials using sessile and sliding volatile droplets

Jabal, Mohammad Abo; Homede, Ekhlas; Pismen, L. M.; Haick, Hossam; Leshansky, Alexander

doi:10.1140/epjst/e2016-60404-x

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…In the case that the polymer possesses a lower surface tension than the solvent (in contact with air), the rapid increase in the concentration of the polymer near the contact line results in a decrease of the local surface tension of the solution close to the contact line. The resulting Marangoni forces are directed away from the contact line into the meniscus and cause a flow that pushes liquid from the vicinity of the contact line into the meniscus. , In the opposite case, if the polymer possesses a higher surface tension than the solvent, a fast increase in the polymer concentration near the contact line causes a sharp local increase in the surface tension of the solution. The resulting Marangoni flow then pushes liquid from the bulk of the meniscus into the vicinity of the contact line.…”

Section: Discussionmentioning

confidence: 99%

“…The resulting Marangoni forces are directed away from the contact line into the meniscus and cause a flow that pushes liquid from the vicinity of the contact line into the meniscus. 26,81 In the opposite case, if the polymer possesses a higher surface tension than the solvent, a fast increase in the polymer concentration near the contact line causes a sharp local increase in the surface tension of the solution. The resulting Marangoni flow then pushes liquid from the bulk of the meniscus into the vicinity of the contact line.…”

Section: The Oscillatory Wetting-dewetting Motionmentioning

confidence: 99%

“…7,8 The deposited patterns find applications in sensing, [9][10][11][12][13][14] data storage, 15,16 and photonic band gap materials 17,18 as well as in the fabrication of nanostructured templates 19,20 and of ordered porous materials. [21][22][23][24] The morphology of the deposits is a consequence of the concurrent interplay of several mechanisms, including the flow in the liquid which is generated by the evaporation of the solvent, Marangoni-force and capillarity induced flows, [25][26][27][28][29][30][31] etc. Furthermore, the evaporation of a macroscopic droplet or an unbounded film into an open vapor atmosphere usually yields rather irregular patterns of rugged rings or lines.…”

Section: Introductionmentioning

confidence: 99%

“…The morphology of the deposits is a consequence of the concurrent interplay of several mechanisms, including the flow in the liquid which is generated by the evaporation of the solvent, Marangoni-force and capillarity induced flows, − and so forth. Furthermore, the evaporation of a macroscopic droplet or an unbounded film into an open vapor atmosphere usually yields rather irregular patterns of rugged rings or lines. − However, restraining the liquid, using physical confinement, is known to yield well organized deposits .…”

Section: Introductionmentioning

confidence: 99%

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Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

et al. 2018

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We study the deposition mechanisms of polymer from a confined meniscus of volatile liquid. In particular, we investigate the physical processes that are responsible for qualitative changes in the pattern deposition of polymer and the underlying interplay of the state of pattern deposition, motion of the meniscus, and the transport of polymer within the meniscus. As a model system we evaporate a solution of poly(methyl methacrylate) (PMMA) in toluene. Different deposition patterns are observed when varying the molecular mass, the initial concentration of the solute, and temperature; these are systematically presented in the form of morphological phase diagrams. The modi of deposition and meniscus motion are correlated. They vary with the ratio between the evaporation-driven convective flux and the diffusive flux of the polymer coils in the solution. In the case of a diffusion-dominated solute transport, the solution monotonically dewets the solid substrate by evaporation, supporting continuous contact line motion and continuous polymer deposition. However, a convection-dominated transport results in an oscillatory ratcheting dewetting-wetting motion of the contact line with more pronounced dewetting phases. The deposition process is then periodic and produces a stripe pattern. The oscillatory motion of the meniscus differs from the well documented stick-slip motion of the meniscus, observed as well, and is attributed to the opposing influences of evaporation and Marangoni stresses, which alternately dominate the deposition process.

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Section: Discussionmentioning

confidence: 99%

Section: The Oscillatory Wetting-dewetting Motionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

et al. 2018

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“…Jabal et al [16] show possible experimental facilities to control shape and flow of droplets. Chen et al [17] perform direct numerical simulations of an evaporating droplet on a heated support.…”

Section: The European Physical Journal Special Topicsmentioning

confidence: 99%

IMA8 – Interfacial Fluid Dynamics and Processes

Bestehorn

2017

Eur. Phys. J. Spec. Top.

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Large‐Area Flexible Perovskite Light‐Emitting Diodes Enabled by Inkjet Printing

Liu,

Shi,

Khan

et al. 2023

Advanced Materials

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Metal halide perovskite light‐emitting diodes (PeLEDs) are attracting increasing attention due to their potential applications in flat panel lighting and displays. The solution process, large‐area fabrication, and flexibility are attractive properties of PeLEDs over traditional inorganic LEDs. However, it is still very challenging to deposit uniform perovskite films on flexible substrates using a blade or slot‐die coating, as the flexible substrate is not perfectly flat. Here, the inkjet printing technique is adopted, and the key challenges are overcome step‐by‐step in preparing large‐area films on flexible substrates. Double‐hole transporting layers are first used and a wetting interfacial layer to improve the surface wettability so that the printed perovskite droplets can form a continuous wet film. The fluidic and evaporation dynamics of the perovskite wet layer is manipulated to suppress the coffee ring effect by solvent engineering. Uniform perovskite films are obtained finally on flexible substrates with different perovskite compositions. The peak external quantum efficiency of the inkjet‐printed PeLEDs reaches 14.3%. Large‐area flexible PeLEDs (4 × 7 cm2) also show very uniform emission. This work represents a significant step toward real applications of large‐area PeLEDs in flexible flat‐panel lighting.

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Controlling Marangoni flow directionality: patterning nano-materials using sessile and sliding volatile droplets

Cited by 6 publications

References 29 publications

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

IMA8 – Interfacial Fluid Dynamics and Processes

Large‐Area Flexible Perovskite Light‐Emitting Diodes Enabled by Inkjet Printing

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