Hierarchically porous bio-inspired films prepared by combining “breath figure” templating and selectively degradable block copolymer directed self-assembly

Bertrand, Arthur; Bousquet, Antoine; Lartigau‐Dagron, Christine; Billon, Laurent

doi:10.1039/c6cc04760b

Cited by 25 publications

(18 citation statements)

References 48 publications

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“…Eur.J. 2018, 24,425 -433 www.chemeurj.org more symmetrical BCP,n ano-segregation was observed recently in the wall between pores by our group, for amphiphilic, [16b, 22] coil-coil [23] and rod-coil BCPs. [24] Herein, the BCPs were not designedt ot arget such nano-structuration,b ut to stabilize water droplets during BF templating.…”

Section: Microstructures Of Porousfilmssupporting

confidence: 54%

Directed Self‐Assembly in “Breath Figure” Templating of Melamine‐Based Amphiphilic Copolymers: Effect of Hydrophilic End‐Chain on Honeycomb Film Formation and Wetting

Yin

Feng

Billon

2017

Chemistry A European J

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Amphiphilic copolymers are widely used in the fabrication of hierarchically honeycomb-structured films through a "breath figure" (BF) process because the hydrophilic block plays a key role in stabilising water templating. However, the hydrophilic monomers reported are mainly confined to acrylic acid and its derivatives, which largely limits understanding of the formation of BF arrays and the introduction of additional functions on porous films. The relationship between polymer composition, film microstructure and surface properties are also less documented. Herein, a novel melamine-based hydrophilic moiety, N-[3-({3-[(4,6-bis{[3-(dimethylamino)propyl]amino}-1,3,5-triazin-2yl)amino]propyl}(methyl)amino)propyl]methacrylamide (ANME), was incorporated into polystyrene (PS) chains by combining atom-transfer radical polymerisation and post-modification to afford three well-defined end-functionalised PS-PANME derivatives. These polymers were used to fabricate honeycomb films through the BF technique. Both inner and outer microstructures of the films were characterised by optical microscopy, AFM and SEM. Polymer hydrophilicity is enhanced upon increasing the PANME content, which results in variation of the film microstructure and porosity, and provokes a transition from Cassie-Baxter to Wenzel behaviour. Furthermore, the surface wettability of as-prepared honeycomb films and corresponding pillared films is mainly governed by film morphology, rather than by the properties of the polymers. Knowledge of the relationships between polymer composition and film structure, as well as surface wettability, is beneficial to design and prepare hierarchically porous films with desirable structures and properties.

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Section: Microstructures Of Porousfilmssupporting

confidence: 54%

Directed Self‐Assembly in “Breath Figure” Templating of Melamine‐Based Amphiphilic Copolymers: Effect of Hydrophilic End‐Chain on Honeycomb Film Formation and Wetting

Yin

Feng

Billon

2017

Chemistry A European J

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“…Bertrand et al. [ 42 ] used polylactide (PLA) as sacrificial component to achieve nanoporosity in a hierarchical porous HC film. They combined BF process and nanoscale self‐assembly of PLA‐ b ‐PS.…”

Section: Sacrificial Components From Nano‐pores To Inorganic Materialsmentioning

confidence: 99%

Bio‐Inspired Silica Films Combining Block Copolymers Self‐Assembly and Soft Chemistry: Paving the Way toward Artificial Exosqueleton of Seawater Diatoms

Álvarez

Marcasuzaa

Billon

2020

Macromol. Rapid Commun.

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This review is in line with the principles of bio‐inspiration and biomimicry in order to envisage a softer and more environmentally friendly chemistry. Here, the source of inspiration is a microalga from the oceans with the ability to build an exoskeleton of silica under ambient conditions. Following this model, this review is interested in different ways of creating porous silica films with a hierarchical porosity similar to diatoms. For this purpose, polymeric/hybrid/inorganic films structured in honeycomb using the breath figure method are reported. This versatile and easy to implement method based on the principle of rapid evaporation of a solvent in a humid atmosphere is widely used in the formation of structured films with micron‐sized pores. In addition to this, the self‐assembly of copolymer at the nanoscale can be addressed to obtain a hierarchically structured film. Following this structuration step, the degradation of a sacrificial block is then described from the most energy‐intensive to soft process, allowing an added nanoporosity to the micron porosity of the BF method. Finally, hierarchical porous silica films are described using the sol–gel process, which is known as a soft chemistry process.

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“…Here, it is worth mentioning that the breath figure process can be combined with amphiphilic [48], coil coil [49], and rod coil [50] block copolymer nanophase segregation to elaborate hierarchically structured honeycomb porous films by the control of concomitant and interacting self organization processes occurring in time at different length scales. Indeed, copolymer ordering at nanometer length scale was described with respect to the ordering of micron sized pores [48 51].…”

Section: Polymer Synthesismentioning

confidence: 99%

Bottom-up honeycomb top layer for light outcoupling enhancement in blue organic light emitting diodes

Bertrand

Dumur

Mruczkiewicz

et al. 2018

Organic Electronics

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International audienceSelf-organized honeycomb (HC) polymer films were fabricated as a bottom-up assembly and deposited onto glass substrates in order to create extraction layers for blue OLEDs. Relying on the fast and tunable " Breath Figure " process, HC films were prepared on a minute timescale and incorporated onto OLED devices, either through direct bottom-up formation onto the OLED substrates or through an original and convenient peeling/transfer method. Two types of HC films differing in period and morphology were prepared, and eventually led to an EQE improvement of 25% measured on an OLED whose emitter molecules are oriented parallel to the plane, using a vapor deposition at room temperature. Additionally, we have modeled the optical characteristics of the HC films, leaning on the fact they are periodic and very regular. This 3D optical model, complemented by a 1D electrical model to determine the Emission Zone Profile (EZP), predicts that the photonic films we fabricated are able to enhance up to 29% the EQE, and opens perspectives for a better design of extraction layers

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Hierarchically porous bio-inspired films prepared by combining “breath figure” templating and selectively degradable block copolymer directed self-assembly

Cited by 25 publications

References 48 publications

Directed Self‐Assembly in “Breath Figure” Templating of Melamine‐Based Amphiphilic Copolymers: Effect of Hydrophilic End‐Chain on Honeycomb Film Formation and Wetting

Directed Self‐Assembly in “Breath Figure” Templating of Melamine‐Based Amphiphilic Copolymers: Effect of Hydrophilic End‐Chain on Honeycomb Film Formation and Wetting

Bio‐Inspired Silica Films Combining Block Copolymers Self‐Assembly and Soft Chemistry: Paving the Way toward Artificial Exosqueleton of Seawater Diatoms

Bottom-up honeycomb top layer for light outcoupling enhancement in blue organic light emitting diodes

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