Controlled evaporative assembly of polymers from confined solutions

Lin, Zhiqun

doi:10.1002/polb.22136

Cited by 20 publications

(38 citation statements)

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“…In contrast, slow solvent evaporation suppresses instabilities, thus yielding highly ordered patterns. It is worth noting that the use of mixed solvents may trigger heterogeneous evaporation of solutions, which promotes the formation of intriguing complex structures in confined geometries 30. Notably, to facilitate the removal of solvent, a steady flow of gas can be introduced to the confined geometry, thus increasing the evaporation rate 31…”

Section: Control Over Variablesmentioning

confidence: 99%

“…The ability to process two or more components sequentially18b or simultaneously16a, 21e to form desirable multicomponent structures has been demonstrated on some occasions. When a drying droplet contains a binary mixture of block copolymer/nanoparticle (i.e., polymer A‐ b ‐polymer B/polymer A (or B)‐modified nanoparticles) or a ternary mixture of polymer blend/nanoparticle (i.e., polymer A/polymer B/polymer A (or B)‐modified nanoparticles), the synergy of phase separation of polymer blends, co‐assembly of surface‐functionalized nanoparticles and block copolymers that imparts preferential segregation of nanoparticles within a target block, and the destabilization of polymer mediated by the unfavorable interfacial interaction between the polymer and the substrate during evaporation in confined geometries, may result in appealing complex structures 30…”

Section: Control Over Variablesmentioning

confidence: 99%

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Learning from “Coffee Rings”: Ordered Structures Enabled by Controlled Evaporative Self‐Assembly

2011

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Research into the evaporation of solutions is not only aimed at a better understanding the physics of evaporation, but increasingly at capitalizing on the extremely simple method it offers to assemble diverse nonvolatile solutes into complex ordered structures on the submicron and longer length scales. This Review highlights recent advances in evaporative assembly of confined solutions, focusing especially on recently developed approaches that provide structures with unprecedented regularity composed of polymers, nanoparticles, and biomaterials, by controlled evaporation‐driven, flow‐aided self‐assembly. A broad range of variables that can control the deposition are explored and the future directions of this rich field are presented.

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Section: Control Over Variablesmentioning

confidence: 99%

Section: Control Over Variablesmentioning

confidence: 99%

Learning from “Coffee Rings”: Ordered Structures Enabled by Controlled Evaporative Self‐Assembly

2011

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“…21 Therefore, another two modied surfaces with PDDA and APTES that have different hydrophobicity but similar surface roughness 39,40 to glass were prepared. 21,33 Raman spectroscopy of stripes self-assembled in the capillary tube Polarized Raman spectroscopy is an effective and robust technique to quantify the molecular orientation and has been applied in the study of P3HT in literatures. As expected, for a fresh CF solution of P3HT (0.1 mg mL À1 ), stripe patterns were observed on these two surfaces.…”

Section: Inner Surface Properties Of the Self-assembly Of P3htmentioning

confidence: 99%

“…17,18 Using these molecular self-assembly techniques, especially the selfassembly approaches occur at the interface, can achieve an orderly arrangement of molecules through evaporation and drying. 21 In our group, rod-like virus particles, like tobacco mosaic virus (TMV) 22 has been applied to construct different scaffolding materials for support cell growth using the CESA method. 21 In our group, rod-like virus particles, like tobacco mosaic virus (TMV) 22 has been applied to construct different scaffolding materials for support cell growth using the CESA method.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of large-scale P3HT patterns by confined evaporation in the capillary tube

et al. 2015

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A facile and robust route to fabricate large area patterns of poly(3-hexylthiophene) (P3HT) was developed by controlled evaporative self-assembly (CESA) technique within a confined space (capillary tubes). Properties of P3HT, solvents effects and inner surface properties of the capillary tube were systematically investigated.The results showed that the patterns could be controlled to evolve from dot deposits and stripes with fingering instabilities, to highly regular, nearly perfect stripes. The orientation of P3HT within an individual stripe was characterized through confocal polarized Raman spectroscopy at molecular level, which revealed that the backbone chains of P3HT were parallel to the contact line. This simple method therefore provides a universal approach to control the morphology of patterns and chain orientation of functional polymers simultaneously.

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“…Hence, the ability to precisely control the capillary flow and convective flux in drying‐mediated self‐assembly to create spatially well‐defined surface structures has received considerable attention. To date, a few elegant studies have demonstrated intriguing means based on the controlled evaporation in confined geometries (i.e., bound solution) to delicately tailor the evaporative self‐organization process, thereby yielding highly ordered structures 4–23. For example, by rationally designing the upper curved surface in curve‐on‐flat geometries to accommodate different shapes, a wide range of complex surface patterns with unprecedented regularity were readily produced during the course of solvent evaporation by controlled, repetitive pinning–depinning cycles of the three‐phase contact line of the droplet constrained in curve‐on‐flat geometries 24.…”

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confidence: 99%

Guided Organization of λ‐DNA into Microring Arrays from Liquid Capillary Bridges

Byun

Han

et al. 2011

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A drying droplet on a solid surface (i.e., unbound solution) often leads to the formation of irregular structures, including coffee rings, [ 1 ] fi ngering instabilities, [ 2 ] and polygonal networks, [ 3 ] owing to the capillary fl ow induced by nonuniform evaporation fl ux or temperature-gradient-induced Marangoni convection. Hence, the ability to precisely control the capillary fl ow and convective fl ux in dryingmediated self-assembly to create spatially well-defi ned surface structures has received considerable attention. To date, a few elegant studies have demonstrated intriguing means based on the controlled evaporation in confi ned geometries (i.e., bound solution) to delicately tailor the evaporative self-organization process, thereby yielding highly ordered structures. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] For example, by rationally designing the upper curved surface in curve-on-fl at geometries to accommodate different shapes, a wide range of complex surface patterns with unprecedented regularity were readily produced during the course of solvent evaporation by controlled, repetitive pinning-depinning cycles of the three-phase contact line of the droplet constrained in curve-on-fl at geometries. [ 24 ] Recently, chemically patterned surface- [25][26][27] and stamp-assisted deposition methods [28][29][30][31][32][33][34][35] have been exploited for evaporative self-assembly of nonvolatile solutes (e.g., nanoparticles and biomolecules). The use of patterned surfaces or polydimethylsiloxane (PDMS) stamps minimizes uncontrolled droplet shape and possible structural instabilities that may otherwise result in a lack of control over the local dewetting dynamics, and thus produces highly regular surface structures. In a typical capillary-force-induced micromolding process, a micropatterned PDMS mold is in contact with a lower stationary substrate where an evaporating droplet is trapped, covering the lower hydrophobic surface and fi lling up the space between adjacent PDMS patterns by either one of two capillary motions: the upward capillary rising induced by wetting between the nonpolar solvent and the hydrophobic surface of the PDMS mold, [ 36 , 37 ] or the downward capillary depression induced by dewetting between the polar solvent and the PDMS mold. [ 38 ] The former capillary motion has been extensively studied and proven to be more successful. [ 36 , 37 ] In contrast, the latter (i.e., the polar solvent/hydrophobic PDMS system, which is recognized as edge-transfer lithography [ 38 ] ) has rarely been utilized due to diffi cult control over the dewetting of the solution. The capillary action of the solution constrained in the confi ned geometry can be signifi cantly infl uenced by the shape and curvature of the molds, thereby providing new opportunities for controlling the local dewetting dynamics to form ordered structures. [ 24 ] Herein, we demonstrate a facile route to creating λ -DNA microring arrays via dewetting-induced self-assembly guided by liquid capillary m...

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Controlled evaporative assembly of polymers from confined solutions

Cited by 20 publications

References 50 publications

Learning from “Coffee Rings”: Ordered Structures Enabled by Controlled Evaporative Self‐Assembly

Learning from “Coffee Rings”: Ordered Structures Enabled by Controlled Evaporative Self‐Assembly

Self-assembly of large-scale P3HT patterns by confined evaporation in the capillary tube

Guided Organization of λ‐DNA into Microring Arrays from Liquid Capillary Bridges

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