Mesoscopic pattern formation of nanostructured polymer assemblies

Maruyama, Norihiko; Karthaus, Olaf; Ijiro, Kuniharu; Shimomura, Masatsugu; Koito, Takeo; Nishimura, Shinnichiro; Sawadaishi, Tetsuro; Nishi, Norio; Tokura, Seiichi

doi:10.1016/s0968-5677(98)00027-3

Cited by 101 publications

(66 citation statements)

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“…This periodic condensation of polymer along the glass edge was caused by convectional flow in the solution, so-called fingering instability. [16] The fingering instability is one of the typical dissipative structures known as the ªtears of wineº phenomenon, caused by Marangoni convection and governed by the interaction between surface and interfacial tension. It is known that local condensation of polymer decreases the local surface tension of the solution, and therefore the solution spreads to a region of higher concentration.…”

Section: Mechanism Of Formation Of Polymer Patternsmentioning

confidence: 99%

Preparation of Self-Organized Mesoscale Polymer Patterns on a Solid Substrate: Continuous Pattern Formation from a Receding Meniscus

2005

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Regular polymer patterns are formed from casting a dilute polymer solution on a solid substrate. Dissipative structures, e.g., convection patterns, fingering instabilities, and so on, are formed in the evaporation process of casting polymer films. Controlled production and manufacturing of patterned polymer films can be achieved when the evaporating solution edge, especially the meniscus region on the casting substrate, is formed under controlled casting conditions. In this report, we describe a computer‐controlled apparatus which has two precisely manipulated sliding glass plates. A narrow, thin liquid film of polymer solution with a receding meniscus is continuously supplied from a small gap between two glass plates (one sliding and the other stationary), and a patterned polymer film is subsequently formed on the stationary substrate from the evaporating solution edge. Several types of polymer patterns from various polymers are reproducibly prepared by changing preparation conditions such as sliding speed and polymer concentration.

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Section: Mechanism Of Formation Of Polymer Patternsmentioning

confidence: 99%

Preparation of Self-Organized Mesoscale Polymer Patterns on a Solid Substrate: Continuous Pattern Formation from a Receding Meniscus

2005

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“…It was reported that the capillary attractive forces are an important factor during the formation of the honeycomb structure. [19] It was also indicated that the capillary force only acted locally. [12,20] Based on the observation of the initial stage of water droplets condensation after the evaporation of solvent, Peng et al [14] deduced that in the first stage of solvent evaporation, water droplets condensed on the surface of the solution and formed many isolated ''islands'' with ordered structures.…”

Section: Mutual Assistance Of Solvents Inducing the Formation Of Regumentioning

confidence: 99%

Influence of Solvents on the Formation of Honeycomb Films by Water Droplets Templating

Tian

Ding

Jiao

et al. 2006

Macro Chemistry & Physics

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Summary: Several solvents were utilized to investigate their influence on the formation of honeycomb patterns. The polymers PPO, PLGA and PLLGA were dissolved in different solvents or mixed solvents to form porous membranes. It was found that a good compatibility between the polymers and their solvents, and an appropriate volatility of the solvent were beneficial for the formation of regular structures. Moreover, C2HCl3 and CH2Cl2, neither of whose PPO solutions could form regular structures at 30 °C, were mixed at different volume ratios to dissolve PPO and fabricate porous structures. The result showed that a regular pattern was achieved when the volume ratio of C2HCl3:CH2Cl2 was 90:10 and that a special structure with big pores surrounded by small pores was obtained when the volume ratio of C2HCl3:CH2Cl2 was 10:90. Based on these phenomena, possible reasons were also proposed. magnified image

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“…It has already been reported that multilayer porous films can be fabricated by the breath-figure technique. [23,24] The formation mechanism was proposed by Shimomura et al [25] and Yu et al [26] After casting a droplet of chloroform solution on the substrate, the chloroform starts to evaporate. This leads to cooling of the solution and micrometer-sized water droplets condense onto the chloroform solution of PDTG.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Photocurrent Generation by Honeycomb Structures in Organic Thin Films

et al. 2006

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A light-emitting poly (distyryldimethylbenzene-co-triethylene glycol) rod-coil block copolymer was used to fabricate films with three-dimensionally ordered honeycomb structures by the breath-figure method. Photocurrent generation and photovoltaic performance are studied, and the dependence of photocurrent on applied electric field is investigated. Introducing the ordered porous structure significantly improves the photoelectric conversion behavior, because porous structures not only enhance the light-harvesting efficiency but also benefit charge separation and charge transfer. This phenomenon may have great prospects for enhancing the photovoltaic behavior of organic thin-film devices.

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Mesoscopic pattern formation of nanostructured polymer assemblies

Cited by 101 publications

References 0 publications

Preparation of Self-Organized Mesoscale Polymer Patterns on a Solid Substrate: Continuous Pattern Formation from a Receding Meniscus

Preparation of Self-Organized Mesoscale Polymer Patterns on a Solid Substrate: Continuous Pattern Formation from a Receding Meniscus

Influence of Solvents on the Formation of Honeycomb Films by Water Droplets Templating

Enhancement of Photocurrent Generation by Honeycomb Structures in Organic Thin Films

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