Controlling Profiles of Polymer Dots by Switching between Evaporation and Condensation

Kajiya, Tadashi; Kobayashi, Wataru; Okuzono, Tohru; Doi, Masao

doi:10.1021/la1016388

Cited by 30 publications

(33 citation statements)

References 26 publications

(27 reference statements)

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“…In the future, this work can be extended to include solutal Marangoni effects; binary liquid systems, where the two liquid components have different volatilities and surface tensions; humidity cycling, as in Ref. , to periodically switch between evaporation and condensation and to analyze situations where the substrate is not flat.…”

Section: Resultsmentioning

confidence: 99%

Evaporation of pinned droplets containing polymer – an examination of the important groups controlling final shape

Eales

Routh

Dartnell³

et al. 2015

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) Controlling the final shape resulting from evaporation of pinned droplets containing polymer, is important in the fabrication of P-OLED displays by inkjet printing. Typically, a coffee -ring shape arises, due to the pinning and associated outward capillary flow. For operational reasons, this is undesirable -a flat topography is required. The aim of this work is to understand the important groups governing the shape, to provide a practical guide to ink selection. The theory presented is based on a thin-film lubrication model. The governing equations are solved numerically and continuously track the lateral progression of a liquid/gel front. A large capillary number or large ratio of initial to maximal polymer volume fraction can suppress the coffee-ring. White light interferometry is used to confirm these findings experimentally.

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Section: Resultsmentioning

confidence: 99%

Evaporation of pinned droplets containing polymer – an examination of the important groups controlling final shape

Eales

Routh

Dartnell³

et al. 2015

AIChE Journal

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“…On the other hand, for concentrated polymer solutions with high viscosity k ev can be larger than 10 −1 [28,29].…”

Section: Fig 1 (Color Online)mentioning

confidence: 97%

Ring to Mountain Transition in Deposition Pattern of Drying Droplets

Man¹,

Doi²

2016

Phys. Rev. Lett.

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119

104

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When a droplet containing a non-volatile component is dried on a substrate, it leaves a ringlike deposit on the substrate. We propose a theory which predicts the deposit distribution based on a model of fluid flow and contact line motion of the droplet. It is shown that the deposition pattern changes continuously from coffee-ring to volcano-like and to mountain-like depending on the mobility of the contact line and the evaporation rate. Analytical expression is given for the peak position of the distribution of deposit left on the substrate.

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“…A particular case in point is the coffee‐ring effect which is caused by an outward capillary flow generated by solvent evaporation that carries solutes toward the contact line of microdroplets . Several efforts have been made up to now to overcome such an undesired distribution of the deposits by adding surfactants, exposing to solvent vapor, or changing the shape of the suspended particles, substrate temperature, or acidity of solution, although these attempts have not proved successful in improving device characteristics.…”

Section: Introductionmentioning

confidence: 99%

Underlying Mechanism of Inkjet Printing of Uniform Organic Semiconductor Films Through Antisolvent Crystallization

Noda

Minemawari

Matsui

et al. 2015

Adv Funct Materials

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An underlying mechanism is reported for the formation of highly uniform crystalline organic semiconductor fi lms by the double-shot inkjet printing (IJP) technique utilizing antisolvent crystallization. It is demonstrated that the ability to form uniform fi lms with this technique can be attributed to the unique nature of the initial contact dynamics between the chemically different microdroplets before occurrence of solute crystallization. Experiments are conducted systematically where a single microdroplet is over-deposited by the IJP technique on a chemically different sessile droplet, for ten kinds of pure and miscible solvent combinations. The subsequent behavior is observed by high speed camera. The initial contact dynamics can be classifi ed into three dramatically different cases that are respectively referred to as wetting, dewetting, and sinking. These phenomena are unique to microdroplets and the conditions for the occurrence of each type of phenomenon can be consistently explained by the fact that the initial contact dynamics are driven by the difference of surface tension of the liquids. Among the three kinds of dynamics, the wetting phenomenon creates a thin solution layer on the antisolvent droplet surface and can be used thus to manufacture uniform semiconductor fi lms, where the coffee ring effect can be eliminated.

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Controlling Profiles of Polymer Dots by Switching between Evaporation and Condensation

Cited by 30 publications

References 26 publications

Evaporation of pinned droplets containing polymer – an examination of the important groups controlling final shape

Evaporation of pinned droplets containing polymer – an examination of the important groups controlling final shape

Ring to Mountain Transition in Deposition Pattern of Drying Droplets

Underlying Mechanism of Inkjet Printing of Uniform Organic Semiconductor Films Through Antisolvent Crystallization

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