Breath figure templated self-assembly of porous diblock copolymer films

Saunders, Aaron E.; Dickson, Jasper L.; Shah, Parag S.; Lee, Min Young; Lim, Kwon Taek; Johnston, Keith P.; Korgel, Brian A.

doi:10.1103/physreve.73.031608

Cited by 58 publications

(62 citation statements)

References 41 publications

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“…The other possible mechanism could be analogous to the widely observed breath figure (BF) formation on drop-cast polymer films. [62][63][64][65][66][67][68][69][70][71][72] In earlier publications, 41,42 we proposed the possibility that water condensation onto the PEO-based block copolymers leads to PEO domain ordering. After solvent annealing, the solvent evaporation causes the cooling of the film surface.…”

Section: Discussionmentioning

confidence: 99%

Square Packing and Structural Arrangement of ABC Triblock Copolymer Spheres in Thin Films

et al. 2008

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Nanoporous thin films were prepared from poly(ethylene oxide)-b-poly(methyl methacrylate)-bpolystyrene (PEO-b-PMMA-b-PS) ABC triblock copolymer by solvent annealing under high relative humidity followed by UV degradation and acid washing. Ordered half-spheres at the surface that template ordering of spheres below the surface in thin films were formed as a result of the interaction between the hydrophilic PEO segments and water vapor during processing. The spherical block copolymer domains exhibit complex packing behavior on the surface and in the interior. A half-sphere "monolayer" and a half-sphere plus whole sphere "bilayer" were formed in thin films with thicknesses of 43 and 71 nm, respectively, and have hexagonal lattice symmetry. For half-sphere plus two whole sphere "trilayers" with a nominal thickness of 117 nm, coexistence of regions of hexagonal and square packing was observed by transmission electron microscopy, scanning force microscopy, scanning electron microscopy, and grazing-incidence small-angle X-ray scattering. Square packing was consistent with a surface-truncated unit cell of a body-centered cubic lattice with the (100) plane parallel to the surface.

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Section: Discussionmentioning

confidence: 99%

Square Packing and Structural Arrangement of ABC Triblock Copolymer Spheres in Thin Films

et al. 2008

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“…The size of the fabricated pores is easily controllable by adjusting various processing parameters such as the polymer concentration, [31] molecular weight or chemical structure of used polymer, [32][33][34][35] humidity or flow rate of applied air stream, [36] solvent evaporation rate, [37] solution casting temperature, [38] film thickness, [39] etc. Encapsulation of aqueous droplets by a thin polymer stratum induced by thermocapillary or Marangoni convection has been suggested as a mechanism for a hard colloid-like interaction between aqueous droplets without the use of colloid stabilizer.…”

Section: Full Papermentioning

confidence: 99%

“…Nucleation of aqueous droplets is known to be promoted in a polymer solution containing a hydrophilic polymer component. [32] However, the overall condensation rate of the aqueous droplets does not significantly depend on the chemical nature of the dissolved polymer. As a result, pore size decreases with the content of hydrophilic component.…”

Section: Full Papermentioning

confidence: 99%

Hierarchically Ordered Polymer Films by Templated Organization of Aqueous Droplets

Park

Lee

Han

et al. 2007

Adv Funct Materials

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Hierarchically ordered structures facilitate the incorporation of diverse functions simultaneously. The present report introduces a simple and novel strategy for producing hierarchically ordered polymeric films. Hierarchical ordering of aqueous droplets on a polymer solution is realized by the imposition of physical confinement via various shaped gratings. After drying of the solution, well‐ordered hierarchical structures were fabricated in the remaining polymer film. The size of the grating structure and the lattice size of spontaneous hexagonally packed aqueous pores comprise two different length scales, thereby offering multiscale ordering. Interfacial wetting of the polymer solution to the grating surface was crucial in terms of obtaining a highly ordered structure that can be tuned by dissolving a small amount of surfactant in the polymer solution. The present novel approach provides a new opportunity for lithography‐free fabrication of complex hierarchical structures.

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“…An increase in the nucleation density leads to smaller final droplet size and this is a promising way to produce porous films having various pore sizes and spacing. 223 Liu and coworkers produced fluorescent honeycomb-patterned films of amphiphilic hyperbranched poly(amidoamine)s with high reproducibility on variety of substrates in a wide range of humidities. They reported that the patterned film thicknesses can be changed from nanometer to micrometer scale by altering the polymer concentration.…”

mentioning

confidence: 99%

Droplet condensation on polymer surfaces: A review

UÇAR¹

2013

Turk J Chem

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A novel root inclusion net method was designed to determine the fine root productions and turnover rates of 13-, 22-, and 38-year-old Larix principis-rupprechtii plantations in the whole growing season of 2012, and it was compared with the results of the sequential coring method and in-growth core method. All following values are reported in order for 13-, 22-, and 38-year-old L. principis-rupprechtii plantations. The mean values of fine root biomasses were 103, 261, and 356 g m -2 , about 76-78% of which were live fine root biomasses. The fine root productions were 86-118 g m -2 year -1 , 124-138 g m -2 year -1 , and 134-160 g m -2 year -1 , respectively. The fine root turnover rates were 1.12, 0.61, and 0.51 times year -1 , respectively, suggesting a relative slow fine root turnover in L. principisrupprechtii plantations. The carbon inputs into soil accompanying fine root turnover were 52, 58, and 94 g C m -2 year -1 . This organic carbon is a sizeable pool in the forest ecosystem. The results suggest that our new modified root inclusion net method is suitable for field-based assessment of fine root production and turnover.

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Breath figure templated self-assembly of porous diblock copolymer films

Cited by 58 publications

References 41 publications

Square Packing and Structural Arrangement of ABC Triblock Copolymer Spheres in Thin Films

Square Packing and Structural Arrangement of ABC Triblock Copolymer Spheres in Thin Films

Hierarchically Ordered Polymer Films by Templated Organization of Aqueous Droplets

Droplet condensation on polymer surfaces: A review

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