Formation and control of line defects caused by tectonics of water droplet arrays during self-organized honeycomb-patterned polymer film formation

Yamazaki, Hidekazu; Ito, Keisuke; Yabu, Hiroshi; Shimomura, Masatsugu

doi:10.1039/c3sm52790e

Cited by 31 publications

(34 citation statements)

References 43 publications

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“…The above simulation results demonstrate that a single‐domain honeycomb metal mesh features an anisotropic elongation depending on the grid orientation, such as the metal grid transparent conductors fabricated by laser sintering of silver nanoparticle ink and laser ablation of copper film . For structures fabricated by self‐assembly process, such as the metal meshes prepared by breath‐figure approach, are composed of multiple domains with various grid orientation due to the existence of line defects . This merit results in isotropic characteristics, such as uniform conductivity and stretchability in a large area.…”

Section: Introductionmentioning

confidence: 78%

Metal Mesh as a Transparent Omnidirectional Strain Sensor

Zhou

et al. 2019

Adv Materials Technologies

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developed in recent years. The stretchable conductors used in those sensors work via piezoresistive sensing mechanism, such as thin metal films (TMFs) deposited onto stretchable polymers [18][19][20] and some filler-type elastomers composed of carbon nanotubes, [16,17] graphene, [21,22] and metal nanowires. [14,[23][24][25][26][27][28] Particularly, TMFs strain sensors are feasible to be prepared in a large area by direct deposition approach, making it compatible with conventional Si-based processes and easy to integrate into external circuits and devices. However, the stiff feature of TMFs will lead to mechanical failure when stretched over their elongation limit, e.g., less than 1% for thin Cu films. [19] To resolve this problem, various structures with wavy, buckle, wrinkle, or network topography have been introduced to adapt mechanical deformation. [29][30][31][32][33] However, these strain sensors are operated only in uniaxial or biaxial stretching directions, [29] not suitable for the omnidirectional model, which is crucial for practical applications. For example, a strain sensor attached to the human body will inevitably suffer from multidimensional strain. Developing multidimensional TMFs-based strain sensor is highly demanded while still a challenge. It is noteworthy that metal mesh films are possibly stretched in all direction, taking a honeycomb metal mesh film as an example. A simulated polyethylene terephthalate (PET) mesh with a honeycomb structure that consists of regular hexagonal cells is depicted in Figure 1a. The ratio of pore size diameter D to the frame width W (D/W) is controlled to be 5/1 (Figure 1d). The experiments by stretching PET meshes show that the elongation degree along X-direction is higher than that on Y-direction (Figure 1b,c). The maximum elongation along X-direction (e max-x ) and Y-direction (e max-y ) (calculated from Equations E1 and E2 in the Supporting Information) are 41.2% (Figure 1e) and 15.2% (Figure 1f), respectively.The above simulation results demonstrate that a singledomain honeycomb metal mesh features an anisotropic elongation depending on the grid orientation, such as the metal grid transparent conductors fabricated by laser sintering of silver nanoparticle ink and laser ablation of copper film. [34,35] For structures fabricated by self-assembly process, such as the metal meshes prepared by breath-figure approach, are composed of multiple domains with various grid orientation due to the existence of line defects. [36,37] This merit results in isotropic characteristics, such as uniform conductivity and stretchability in a large area. In this work, we prepare a transparent, highly stretchable, and omnidirectional strain sensor using porous honeycomb-structured Ag mesh film that consists of multiple Thin metal films can be engineered to fabricate strain sensors by conquering their stiffness using wavy, buckle, or wrinkle topography. However, these structures usually operate in uniaxial or biaxial stretching directions, limiting their application in the omnidirecti...

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Section: Introductionmentioning

confidence: 78%

Metal Mesh as a Transparent Omnidirectional Strain Sensor

Zhou

et al. 2019

Adv Materials Technologies

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“…[ 46 ] PLLA, PDLA, and PLLA/ PDLA (1:1) were dissolved in chloroform to prepare 10 mg mL −1 solutions. In any case, dichloromethane, tetrahydrofran, and acetone did not give uniform honeycomb structures.…”

Section: Preparation Of Honeycomb Filmsmentioning

confidence: 99%

Thermally Stable Honeycomb‐Patterned Porous Films of a Poly(L‐lactic acid) and Poly(D‐lactic acid) Stereo Complex Prepared Using the Breath Figure Technique

Abe

Hirai

Yabu

2016

Macro Materials & Eng

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cells. Scaffolds with pores ranging from subcellular to cellular dimensions are particularly attractive materials for understanding the behavior of cells growing on porous scaffolds. However, porous materials currently available for use as cell culture scaffolds have heterogeneous pores, making it diffi cult to optimize their mass-transfer properties.A honeycomb-patterned polymer fi lm prepared by casting polymer solution under humid conditions, followed by solvent evaporation, holds promise for a wide variety of applications, including as superhydrophobic surfaces, [ 13,14 ] a template composed of microlens arrays, [ 15,16 ] porous electrodes, [ 17 ] and other practical applications. [18][19][20][21] These applications utilize the uniformly sized and hexagonally arranged pores of the fi lms. These pores are generated by evaporative cooling, which leads to water droplets condensing onto the surface of the polymer solution during solvent evaporation. The condensed water droplets act as templates to form porous fi lms with hexagonally arranged pores following complete evaporation fi rst of the solvent, then of the template water droplets. [ 22,23 ] This "breath fi gure" technique allows the formation of unique 3D structured, laterally connected pores that refl ect the shape of the template water droplets.Porous polymer materials prepared from biodegradable polymers have received considerable attention due to their potential as cell culture scaffolds for tissue engineering. Porous materials are generally sterilized by autoclaving prior to use as cell culture scaffolds to avoid unexpected biological infection. However, the melting point of biodegradable polymers is typically lower than the temperature used in autoclave sterilization. Here, the preparation of honeycomb fi lms comprising a poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) stereo complex is described and their thermal stabilities are evaluated. The hierarchic photochemical patterning of PLLA/PDLA stereo complex honeycomb-patterned fi lms by UV-O 3 treatment is also demonstrated.

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“…[5] During the past two de-cades,this strategy has been significantly developed by avariety of researchers. [10,11] Ab ig advantage of the honeycombs tructures fabricated by the BF methodi st hat the functions of the films can be facilely tuned by engineeringt he starting materials. [6][7][8][9] Recentp rogress has been focused on furthere xpanding the field from fundamental researcht oe ncouraging industrialized applications by the productiono fl arge-area honeycomb structures.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9] Recentp rogress has been focused on furthere xpanding the field from fundamental researcht oe ncouraging industrialized applications by the productiono fl arge-area honeycomb structures. [10,11] Ab ig advantage of the honeycombs tructures fabricated by the BF methodi st hat the functions of the films can be facilely tuned by engineeringt he starting materials. Up to now,v arious candidates have been explored to form honeycomb structures.B esides polymers with diversec ompositions and structures, [12][13][14][15] av ariety of materials with attractive properties have also been tried, including carbon nanotubes( CNTs), [16,17] grapheneo xide (GO), [18] proteins, [19] small organic molecules, [20][21][22] and inorganic-organic hybrids.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Honeycomb Structures from Polyoxometalates and an Imidazolium‐Based Ionic Liquid Bearing a π‐Conjugated Moiety and a Branched Aliphatic Chain

Zhang

Zhu

Chen

et al. 2017

Chemistry A European J

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Honeycomb-structured films represent an intriguing class of two-dimensional porous materials. Specifically, polyoxometalate (POM) macroanions can be introduced into these films by complexing with oppositely charged, double-tailed surfactants. Here highly-ordered honeycomb structures are reported that can be constructed by the complexes between POMs and a room temperature ionic liquid (IL1) having an imidazolium moiety in the middle and a naphthyl unit and a branched aliphatic chain at the ends. The complexes can be produced through phase transfer between an aqueous solution of POMs (typically {Mo Fe }) and a CS (or chloroform) solution of IL1. Based on the intrinsic properties of {Mo Fe } and the functional groups of the IL1, the honeycomb structures show multiple functions with bright photoluminescence and rich electrochemical properties. This work shows that by simply engineering the organic ligands involved in the POM-based inorganic-organic complexes, supramolecular structures with improved properties and wide applications can be obtained.

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Formation and control of line defects caused by tectonics of water droplet arrays during self-organized honeycomb-patterned polymer film formation

Cited by 31 publications

References 43 publications

Metal Mesh as a Transparent Omnidirectional Strain Sensor

Metal Mesh as a Transparent Omnidirectional Strain Sensor

Thermally Stable Honeycomb‐Patterned Porous Films of a Poly(L‐lactic acid) and Poly(D‐lactic acid) Stereo Complex Prepared Using the Breath Figure Technique

Photoluminescent Honeycomb Structures from Polyoxometalates and an Imidazolium‐Based Ionic Liquid Bearing a π‐Conjugated Moiety and a Branched Aliphatic Chain

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