Self-patterning induced by a solutal Marangoni effect in a receding drying meniscus

Doumenc, F.; Guerrier, B.

doi:10.1209/0295-5075/103/14001

Cited by 35 publications

(46 citation statements)

References 27 publications

(28 reference statements)

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“…These temperature gradients create surface tension gradients which induce the thermal Marangoni stresses . Besides thermal Marangoni stress, surface tension gradients can also be generated from solute concentration gradient, as was observed and predicted for polymer solutions . This effect is referred to as a solutal Marangoni effect.…”

Section: Resultsmentioning

confidence: 83%

“…Although the magnitude of the Marangoni wavelength is predicted to be between 1.3 and 3.1 μm, which is smaller than the measured 30 μm, it remains nearly constant regardless of UVO exposure time. This discrepancy in predicted and measured Marangoni wavelength is most likely due to the unmeasurable increase in viscosity at the evaporating meniscus front …”

Section: Resultsmentioning

confidence: 93%

“…To quantify the solutal Marangoni effect, we estimate the Marangoni number ( M a ) and Marangoni wavelength ( λ )

M_{a} = true(\frac{d γ}{d c} true) \frac{Δ c \cdot h}{η D}

λ = \frac{2 π h}{\sqrt{M_{a} / 8}}

…”

Section: Resultsmentioning

confidence: 99%

“…22,23 Besides thermal Marangoni stress, surface tension gradients can also be generated from solute concentration gradient, 24 as was observed and predicted for polymer solutions. 25,26 This effect is referred to as a solutal Marangoni effect. One noteworthy example of solutal Marangoni stresses is "Tears of Wine," in which fluid from an area of lower surface tension is drawn to an area of higher surface tension due to a tension gradient 27,28 (Marangoni force).…”

Section: Solutal Marangoni Flowmentioning

confidence: 99%

“…This discrepancy in predicted and measured Marangoni wavelength is most likely due to the unmeasurable increase in viscosity at the evaporating meniscus front. 25,30 Hyperbranched Structure Formation To reveal the details of spontaneous structure formation of hyperbranched structures, we employed in situ microscopy [ Fig. 3(A)].…”

Section: Solutal Marangoni Flowmentioning

confidence: 99%

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Hyperbranched polymer structures via flexible blade flow coating

Liu

Lee

Monteux³

et al. 2015

J Polym Sci B Polym Phys

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International audienceEvaporative self-assembly has been shown to be a scalable method for organizing nonvolatile solutes, for example, nanoparticles; however, the influence of substrate surface energy on this technique has not been studied extensively. In this work, we utilized an evaporative self-assembly process based upon flexible blade flow coating to fabricate organized structures that have been modified to systematically vary surface energy. We focused on patterning of polystyrene. We observed a variety of polystyrene structures including dots, hyperbranched patterns, stripes, and lines that can be deposited on substrates with a range of wetting properties. We explained the mechanism for these structural formations based on the competition between Marangoni flow, friction, and viscosity. The development of this fundamental knowledge is important for controlling hierarchical manufacturing of nanoscale objects with different surface chemistries and compositions

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 93%

“…To quantify the solutal Marangoni effect, we estimate the Marangoni number ( M a ) and Marangoni wavelength ( λ )

M_{a} = true(\frac{d γ}{d c} true) \frac{Δ c \cdot h}{η D}

λ = \frac{2 π h}{\sqrt{M_{a} / 8}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Solutal Marangoni Flowmentioning

confidence: 99%

Section: Solutal Marangoni Flowmentioning

confidence: 99%

See 3 more Smart Citations

Hyperbranched polymer structures via flexible blade flow coating

Liu

Lee

Monteux³

et al. 2015

J Polym Sci B Polym Phys

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Optimized Charge Transport in Molecular Semiconductors by Control of Fluid Dynamics and Crystallization in Meniscus‐Guided Coating

Yildiz

Wang

Borkowski

et al. 2021

Adv Funct Materials

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The effects of the casting speed and solute concentration on the crystallization of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) during meniscus-guided coating (MGC) are investigated, and three morphological subregimes with increasing casting speed are identified: I) an isotropic domain-like structure; II) unidirectionally aligned crystalline bands; and III) a corrugated dendritic morphology. Interestingly, increasing the solute concentration does not affect these morphologies but merely the associated transition velocities. Numerical simulation of both the fluid dynamics in the coating bead and the crystallization itself not only explains these morphological trends but also the decrease in the width of the crystalline bands of morphology II with the casting speed. They demonstrate that the latter provides an optimal processing window for organic field-effect transistors, with minimized charge trapping, maximized on/off ratio, and reliability factor.

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Role of Meniscus Shape on Crystallization of Molecular Semiconductors and Fluid Dynamics During Meniscus‐Guided Coating

Yildiz,

Wang,

Brzezinski

et al. 2024

Adv Funct Materials

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Meniscus‐guided coating (MGC) is a promising method that offers predictable fabrication of highly crystalline thin films. For the integration of molecular semiconductors into large‐area electronic devices with high efficiency and reliability, homogeneous and highly ordered film morphologies are required. The solution processing of such defect‐free film structures requires comprehensive understanding of the complex relationship between molecular crystallization, fluid dynamics, and meniscus shape. In this work, the role of the meniscus shape on fluid dynamics in the coating bead and the crystallization process of the low molecular weight semiconductor 6,13‐bis(triisopropylsilylethynyl)pentacene (TIPS‐pentacene) during zone‐casting is systematically investigated. Depending on meniscus shape and coating velocity, four morphological subregimes are found: stick‐slip morphology, unidirectional homogenous crystal stripes, spherulitic morphology, and directional branched morphology; of which the second exhibits the highest crystallinity with a reduced trap density in the thin film, resulting in improved saturation and effective mobilities in field‐effect transistors (FET). Numerical simulation of fluid dynamics explains the observed morphological trends, which are correlated with the electrical behavior of the devices. This work provides a fundamental basis for upscaling MGC methods for the application of functional thin films.

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Self-patterning induced by a solutal Marangoni effect in a receding drying meniscus

Cited by 35 publications

References 27 publications

Hyperbranched polymer structures via flexible blade flow coating

Hyperbranched polymer structures via flexible blade flow coating

Optimized Charge Transport in Molecular Semiconductors by Control of Fluid Dynamics and Crystallization in Meniscus‐Guided Coating

Role of Meniscus Shape on Crystallization of Molecular Semiconductors and Fluid Dynamics During Meniscus‐Guided Coating

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