Production technology and applications of honeycomb films

Yamazaki, Hidekazu; Kohashi, Soichi; Ito, Keisuke; Ijiro, Kuniharu; Shimomura, Masatsugu

doi:10.1038/s41428-021-00549-0

Cited by 10 publications

(6 citation statements)

References 46 publications

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“…Previous studies have reported such structures prepared using the breath figure method, driven by water droplet condensation during the filmforming process. [29][30][31][32][33][34] To confirm the formation mechanism of the rough structure, the hybrid film was spin-coated in a dry Ar atmosphere with no water droplet condensation. The SEM image of the results, depicted in Figure 3c, shows the absence of the honeycomb-like rough structure under these dry conditions.…”

Section: Resultsmentioning

confidence: 99%

“…The breath-figure technique is a process for the spontaneous formation of the textured surfaces that exploits the condensation of water droplets during the film formation process. [29][30][31][32][33][34] For example, Haupt et al reported honeycomb-like film formation with a fluorinated polymer, which has small surface energy, to obtain masks for the plasma etching of silicon substrates. [29] Combining the breath-figure technique with a low-surface-energy material is promising for obtaining a hydrophobic surface.…”

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confidence: 99%

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Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications

Yamamoto

Kai

2022

Adv Materials Inter

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used for ion detection, [15][16][17] biomarker monitoring, [18,19] and neurotransmitter recording. [20][21][22] OECT devices require material innovations to achieve higher device performance and advanced biocompatibility. The scope of innovation includes the substrate and electrode materials, as well as the mixed conducting materials of the channel layers. Substrates in bioelectronic applications are expected to meet wide-ranging requirements, such as low toxicity, durability, flexibility, and good skin adhesion for cutaneous applications. In this context, parylene is one of the most commonly used materials owing to its biocompatibility, stability, and processability, which are compatible with those of the microfabrication techniques. [23][24][25][26] On the other hand, the parylene-based process requires cleanroom facilities, such as photolithography and reactive ion etching. Therefore, there is room for the development of substrate materials that allow facile fabrication by wet processes.The important parameter in wet processes, including spin coating and inkjet printing, [27] is the surface wettability of the substrates. Surface wettability is a function of not only the surface energy of the material but also the surface morphology. The textured, rough surface of a hydrophobic material increases its hydrophobicity, as explained via the Wenzel and Cassie-Baxter models. [28] Such textured or hierarchical structures have been obtained through various processes, including the formation of self-organized structures. The breath-figure technique is a process for the spontaneous formation of the textured surfaces that exploits the condensation of water droplets during the film formation process. [29][30][31][32][33][34] For example, Haupt et al. reported honeycomb-like film formation with a fluorinated polymer, which has small surface energy, to obtain masks for the plasma etching of silicon substrates. [29] Combining the breath-figure technique with a low-surface-energy material is promising for obtaining a hydrophobic surface. Hydrophilic-hydrophobic patterning is a well-known and commonly used technique for the water droplet collection and preparation of patterns in organic semiconducting devices. [35][36][37][38][39][40][41] The typical methods to achieve wettability patterning are microcontact printing [42][43][44][45] and ultraviolet (UV) light irradiation of photocatalytic TiO 2 , [46][47][48] based on the photoinduced hydrophilic conversion properties. [49][50][51] TiO 2containing hybrid films are promising for facile patterning methods to fabricate open microfluidic channels. [52][53][54][55] This paper presents a photo-patternable hybrid film based on TiO 2 stabilized by a ligand-containing polymer and a fluorinated polymer for the facile fabrication of multimodal Organic-inorganic hybrid films based on TiO 2 and a fluorinated polymer are fabricated, and their properties are investigated for bioelectronic applications. The analysis revealed that the preparation process requires (1) aging the blend solution b...

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications

Yamamoto

Kai

2022

Adv Materials Inter

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“…The stability of water droplets and their rearrangement by Marangoni convection and thermocapillary force ensure the formation of honeycomb patterns. [18][19][20][21][22][23][24][25][26][27][28][29][30][31] Up to now, a lot of polymers with different topological structures have been investigated in the BF process, including star-shaped polymers, 18,32,33 dendrimers, 34 comb-like polymers, 35 rod-coil block copolymers, 36,37 and linear polymers. [38][39][40][41][42][43] Apart from topology, the chemical composition of polymers also shows great impact on their self-assembly behavior.…”

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confidence: 99%

Effect of polar groups of polystyrenes on the self‐assembly of breath figure arrays

Zhou

Yang

et al. 2022

Journal of Polymer Science

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The breath figure (BF) process has been widely used to prepare patterned porous films. The mechanism remains to be further elucidated, especially how polymer architectures affect the stability of water droplets and the pore structure. Polystyrenes (PS) was functionalized with a series of polar groups both in chain middle and chain end, which was synthesized by using difunctional atom transfer radical polymerization (ATRP) initiators with the combination of nucleophilic substitution of the end bromine. It is found that PS with polar groups, which help to reduce interfacial tension, tends to form regular patterns at low concentration and to generate multilayered pores. The coalescence resistance measurement was performed to characterize the stabilization of water droplets from polymers by precipitation. The results show opposite trend with the results of the BF process, indicating a minor role played by polymer precipitation on microdroplets stabilization. We reveal that addition of only an oxyethyl group in the chain middle of PS contributes to the formation of ordered patterns. This study helps to shed light on the impact of polymer architectures on the self-assembly behavior in the BF process.atom transfer radical polymerization, breath figure, interfacial tension, isoporous pattern, polar groups | INTRODUCTIONIsoporous materials have found their applications in many areas such as templates, 1,2 sensors, 3-5 cell culture, 6-8 and separation. [9][10][11] In addition to the self-assembly of block copolymers, 12 the breath figure (BF) method has received great attention for its simplicity and economy to prepare isoporous films. [13][14][15][16] Since the first report of condensing droplets by Lord Rayleigh in 1911, 17 the BF method uses volatile solvents to induce vapor condensation, leaving porous imprints after the total evaporation of solvents and droplets. The stability of water droplets and their rearrangement by Marangoni convection and thermocapillary force ensure the formation of honeycomb patterns. [18][19][20][21][22][23][24][25][26][27][28][29][30][31] Up to now, a lot of polymers with different topological structures have been investigated in the BF process, including star-shaped polymers, 18,32,33 dendrimers, 34 comb-like polymers, 35 rod-coil block copolymers, 36,37 and linear polymers. [38][39][40][41][42][43] Apart from topology, the chemical composition of polymers also shows great impact on their self-assembly behavior. Ji et al. reported that the Di Zhou and Bai-Heng Wu contributed equally to this work.

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“…The pores’ presence throughout the structure can facilitate the flow of oxygen, nutrients, and waste products. An adequate flow of substances is an extremely important prerequisite for the survival of a cell and its function in cell culture media and transplantation [ 80 , 101 ]. Different pore sizes can serve as an effective tool to control cell growth or select different cell types [ 102 ].…”

Section: Applications In Medicinementioning

confidence: 99%

Biopolymer Honeycomb Microstructures: A Review

et al. 2023

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In this review, we present a comprehensive summary of the formation of honeycomb microstructures and their applications, which include tissue engineering, antibacterial materials, replication processes or sensors. The history of the honeycomb pattern, the first experiments, which mostly involved the breath figure procedure and the improved phase separation, the most recent approach to honeycomb pattern formation, are described in detail. Subsequent surface modifications of the pattern, which involve physical and chemical modifications and further enhancement of the surface properties, are also introduced. Different aspects influencing the polymer formation, such as the substrate influence, a particular polymer or solvent, which may significantly contribute to pattern formation, and thus influence the target structural properties, are also discussed.

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Production technology and applications of honeycomb films

Cited by 10 publications

References 46 publications

Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications

Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications

Effect of polar groups of polystyrenes on the self‐assembly of breath figure arrays

Biopolymer Honeycomb Microstructures: A Review

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Production technology and applications of honeycomb films

Cited by 10 publications

References 46 publications

Wettability Patternable Hybrid Polymer Films Based on TiO2 and Fluorinated Polymer for Bioelectronics Applications

Wettability Patternable Hybrid Polymer Films Based on TiO2 and Fluorinated Polymer for Bioelectronics Applications

Effect of polar groups of polystyrenes on the self‐assembly of breath figure arrays

Biopolymer Honeycomb Microstructures: A Review

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Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications

Wettability Patternable Hybrid Polymer Films Based on TiO₂ and Fluorinated Polymer for Bioelectronics Applications