Spatial Ordering of Colloids in a Drying Aqueous Polymer Droplet

Şenses, Erkan; Black, Matthew; Cunningham, Thomas; Sukhishvili, Svetlana A.; Akcora, Pinar

doi:10.1021/la400032u

Cited by 27 publications

(28 citation statements)

References 34 publications

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“…As the polymer concentration increases, the deposit pattern has dim rings. This result is consistent with typical deposit patterns taken from polymer suspended droplets 31 : no stains result from de-pinning dynamics and rings from pinning dynamics 23, 32 . The middle two columns of Fig.…”

Section: Resultssupporting

confidence: 89%

“…The suppressed coffee-ring effect for colloid-polymer suspensions made of small colloids is a consequence of interplay between hydrodynamics and colloid-polymer interactions (particularly the colloid flocculation can be induced by the depletion effect of polymer chains 31 ). In the absence of polymers, coffee-ring-induced hydrodynamics determines evaporation and deposit dynamics, resulting in the ring-like deposit patterns.…”

Section: Resultsmentioning

confidence: 99%

“…2(a,b), taken from scanning electron microscopy (SEM). It is known that adsorbing polymer chains can induce the aggregation of colloidal particles during evaporation 31 . The resulting colloidal clusters of small colloids tend to stay at the middle of the droplet despite the existence of the edge-ward coffee-ring flow 35 .…”

Section: Resultsmentioning

confidence: 99%

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Drying-mediated patterns in colloid-polymer suspensions

Ryu

Kim

et al. 2017

Sci Rep

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Drying-mediated patterning of colloidal particles is a physical phenomenon that must be understood in inkjet printing technology to obtain crack-free uniform colloidal films. Here we experimentally study the drying-mediated patterns of a model colloid-polymer suspension and specifically observe how the deposit pattern appears after droplet evaporation by varying particle size and polymer concentration. We find that at a high polymer concentration, the ring-like pattern appears in suspensions with large colloids, contrary to suppression of ring formation in suspensions with small colloids thanks to colloid-polymer interactions. We attribute this unexpected reversal behavior to hydrodynamics and size dependence of colloid-polymer interactions. This finding would be very useful in developing control of drying-mediated self-assembly to produce crack-free uniform patterns from colloidal fluids.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

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Drying-mediated patterns in colloid-polymer suspensions

Ryu

Kim

et al. 2017

Sci Rep

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“…The colloidal particles in a suspension spontaneously form a variety of microstructures on the substrate during drying [2][3][4][5][6][7][8]. The microstructure formation of the colloidal particles is a type of self-organization.…”

Section: Introductionmentioning

confidence: 99%

Direct simulation of drying colloidal suspension on substrate using immersed free surface model

Fujita

Koike

Yamaguchi

2015

Journal of Computational Physics

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This paper presents a new direct simulation method for a drying colloidal suspension on a substrate. A key issue of the present method is the immersed free surface model proposed by the authors, which enables us to estimate accurately and efficiently capillary forces exerted on particles on a free surface. Using the immersed free surface model along with immersed boundary method and level set method, the present method leads to a three-way coupling of the fluid flow, the free surface motion and the particle motion. In addition, the present method includes a way of curvature estimation using virtual grid differencing to calculate accurately a surface tension. The way of curvature estimation is quantitatively validated through the simulation of a still droplet. The immersed free surface model is quantitatively validated through the simulation of a sphere moving across a free surface and the simulation of two spheres moving along a free surface. Finally, simulations of drying colloidal suspension containing 130 particles are performed to demonstrate the applicability of the present method to actual systems.

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“…Xu et al 27 and Zhang et al 28 have studied the evaporation of complex fluid droplet, emphasizing the formation of cracks structure by polymer additives in droplet evaporation. Senses et al 29 observed the evaporated pattern of the colloid-polymer mixture and noticed that the colloid sizes, the concentration of polymer and the chain length varied the final dry patterns. Additionally, parameters including atmospheric temperature, substrate temperature and surface roughness were also responsible to the patterns in the dry deposit.…”

Section: Introductionmentioning

confidence: 99%

Deposit heterogeneity and the dynamics of the organic semiconductors P3HT and PCBM solution under evaporation

Jing

Liu

2015

Mod. Phys. Lett. B

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The formation of organic semiconductor layer is the key procedure in the manufacture of organic photovoltaic solar cell, in which the natural evaporation of the solvent from the polymer solution plays the essential role for the conversion efficiency. Here, poly(3-hexylthiophene) (P3HT) and fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), as two types of semiconductor polymers, were selected as the active layer to form the deposit by drying the blend solution drops on the substrate. We explored the influences of droplet size and solute concentration on the homogeneity of the deposit. Additionally, the spatial distribution of molecular chains and grains and the instability of the droplet morphology during the drying were investigated. The results showed that the "coffee-ring" phenomenon occurred forming an annular deposit at the outermost edge and the width of the annular ring increased linearly with the concentration of the P3HT solution, until a saturation plateau is approached. On the other hand, the PCBM deposition presented a circular disk at low concentration, but displayed a sudden instability for an irregular perimeter at a critical concentration and there existed a second critical concentration above which the deposit exhibited the return of the stable circular shape. The results have an instructive impact on the performance of the device and the formation of fine structures during the process of printing, film preparation and painting.

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Spatial Ordering of Colloids in a Drying Aqueous Polymer Droplet

Cited by 27 publications

References 34 publications

Drying-mediated patterns in colloid-polymer suspensions

Drying-mediated patterns in colloid-polymer suspensions

Direct simulation of drying colloidal suspension on substrate using immersed free surface model

Deposit heterogeneity and the dynamics of the organic semiconductors P3HT and PCBM solution under evaporation

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