Spatially directed vesicle capture in the ordered pores of breath-figure polymer films

Arora, Jaspreet Singh; Ponnusamy, Thiruselvam; Zheng, Rubo; Venkataraman, Pradeep; Raghavan, Srinivasa R.; Blake, Diane A.; John, Vijay T.

doi:10.1039/c5sm01068c

Cited by 15 publications

(8 citation statements)

References 37 publications

(78 reference statements)

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“…In this study we demonstrate an easily implementable method to introduce roughness onto the surface of a hydrogel and thus enhance its oleophobicity. This is done using inverse replicas of honeycomb structures known as breath figures. , Breath figure polymer films are porous polymer films with an array of hexagonally packed surface pores and have found applications as optical band gaps, drug delivery devices, , vesicle capturing surfaces, and templates. , These structures are generated by the condensation of water droplets from humid air onto the surface of an evaporating polymer solution, where the water droplets do not coalesce due to Marangoni thermal stresses. , The film attains the structure of hexagonally arrayed pores upon complete evaporation of the solvent and the water droplets . Breath figures have been fabricated from a number of polymers including polystyrene, poly(lactic- co -glycolic acid), poly(ε-caprolactone), polyimides, and poly(methyl methacrylate) .…”

Section: Introductionmentioning

confidence: 99%

“…This is done using inverse replicas of honeycomb structures known as breath figures. 23,24 Breath figure polymer films are porous polymer films with an array of hexagonally packed surface pores 25 and have found applications as optical band gaps, 26 drug delivery devices, 27,28 vesicle capturing surfaces, 29 and templates. 23,30 These structures are generated by the condensation of water droplets from humid air onto the surface of an evaporating polymer solution, where the water droplets do not coalesce due to Marangoni thermal stresses.…”

Section: ■ Introductionmentioning

confidence: 99%

“…25,31 The film attains the structure of hexagonally arrayed pores upon complete evaporation of the solvent and the water droplets. 25 Breath figures have been fabricated from a number of polymers including polystyrene, 29 poly(lactic-co-glycolic acid), 32 poly(ε-caprolactone), 33 polyimides, 34 and poly(methyl methacrylate). 35 Intrinsically, breath figures exhibit hydrophobicity when made from hydrophobic polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hydrogel Inverse Replicas of Breath Figures Exhibit Superoleophobicity Due to Patterned Surface Roughness

et al. 2016

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The wetting behavior of a surface depends on both its surface chemistry and the characteristics of surface morphology and topography. Adding structure to a flat hydrophobic or oleophobic surface increases the effective contact angle and thus the hydrophobicity or oleophobicity of the surface, as exemplified by the lotus leaf analogy. We describe a simple strategy to introduce micropatterned roughness on surfaces of soft materials, utilizing the template of hexagonally packed pores of breath figures as molds. The generated inverse replicas represent micron scale patterned beadlike protrusions on hydrogel surfaces. This added roughness imparts superoleophobic properties (contact angle of the order of 150° and greater) to an inherently oleophobic flat hydrogel surface, when submerged. The introduced pattern on the hydrogel surface changes morphology as it swells in water to resemble morphologies remarkably analogous to the compound eye. Analysis of the wetting behavior using the Cassie-Baxter approximation leads to estimation of the contact angle in the superoleophobic regime and in agreement with the experimental value.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Hydrogel Inverse Replicas of Breath Figures Exhibit Superoleophobicity Due to Patterned Surface Roughness

et al. 2016

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“…The water vapor is condensed into water droplets, overspreading the surface of the polymer solution. When the solvent and the water droplets evaporate completely, a honeycombed patterned or spherical-shaped array of pores is formed in the solid polymer surface [3][4][5]. In using this technique, various factors play important roles in controlling the porous polymer structure, including polymer concentration, type of organic solvent used, and humidity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Highly ordered porous PLA films prepared by breath figure method

Preuksarattanawut¹,

Nisaratanaporn²,

Siralertmukul³

2019

J Met Mater Miner

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Honeycomb-patterned porous biodegradable PLA film can be successfully prepared by the Breath Figure (BF) method, which is a self-assembly template and low-cost process. In this research, the fabrication was designed to create a convenient and simple process aimed at meeting commercial requirements. Production of regularly ordered pattern microporous film is carried out in a closed system with optimum conditions. Thus, important production factors â€”that is, the starting polymer concentration in solution, the type of solvent (which affects the solvent evaporation rate), and the relative humidity of the closed chamber â€”were investigated to identify the optimum conditions. The results showed that highly ordered porous film with smaller average pore size of 23.29Â±4.55 Âµm on strut was generated (19.98Â±2.82 Âµm) when high PLA concentration (10% wt PLA) in dichloromethane with 80-85% RH relative humidity was applied.

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“…The roughness is created through the fabrication of inverse replicas of breath figure films whose pores are filled with tightly packed silica nanoparticles. Breath figures, also known as honeycomb films, are polymer films with an array of hexagonally packed holes on their surface 29 and have found applications as drug delivery devices, 30,31 vesicle capturing surfaces, 32 optical band gaps 33 and templates. 34,35 This work demonstrates the replica molding of nanoparticle impregnated breath figures on pHEMA hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical patterning of hydrogels by replica molding of impregnated breath figures leads to superoleophobicity

et al. 2016

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The surface chemistry and topography govern the spreading of liquids on a solid. When an oil drop makes a contact angle, θ > 90° on a solid surface, the solid is termed as oleophobic. Adding roughness to an inherently oleophobic surface enhances its oil dewetting and can lead to superoleophobicity when θ > 150°. In this study, we introduce the concept of a two-tier hierarchical roughness on the surface of soft materials such as hydrogels by forming the patterned inverse replica of breath figure polymer films impregnated with nanoparticles. The directed deposition of nanoparticles in the breath figure pores is accomplished by an aerosol assisted technique that exclusively leads to deposition within the pores and filling of the pores. The inverse replica of such impregnated films exhibits a close packed hexagonally structured second tier of surface roughness which directly leads to a superoleophobic surface. Since these structures have well defined geometries, it is possible to estimate the contact angle by assuming a partial wetting of the oil drop in a 'fakir' state on the rough surface. The estimation is in good agreement with the experimental contact angle value. While the work demonstrates a facile method to impart superoleophobicity to a hydrogel surface, it also demonstrates new methods to imbue breath figure pores with functional materials that can be easily transferred to the pores of the inverse replica.

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Spatially directed vesicle capture in the ordered pores of breath-figure polymer films

Cited by 15 publications

References 37 publications

Hydrogel Inverse Replicas of Breath Figures Exhibit Superoleophobicity Due to Patterned Surface Roughness

Hydrogel Inverse Replicas of Breath Figures Exhibit Superoleophobicity Due to Patterned Surface Roughness

Highly ordered porous PLA films prepared by breath figure method

Hierarchical patterning of hydrogels by replica molding of impregnated breath figures leads to superoleophobicity

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