Fabrication of 3D Microstructures from Interactions of Immiscible Liquids with a Structured Surface

Balowski, Joseph; Wang, Yuli; Allbritton, Nancy L.

doi:10.1002/adma.201301658

Cited by 12 publications

(11 citation statements)

References 34 publications

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“…This result is in agreement with our prediction, CR = r/R = cosθ (see Figure 2b, see the Supporting Information for details). Based on our observations (see Figure 2c–f), the array of μ‐SCs fabricated with the s‐PUA‐based mold had the highest meniscus curvature because of greater molecular interactions than other molds 27. By controlling the meniscus of a viscous precursor, we obtained adhesive patches with uniform, fiber arrays of different 3D microtips, tailored by capillarity as shown in Figure 2c–f; and Figure S4, Supporting Information.…”

mentioning

confidence: 83%

Highly Adaptable and Biocompatible Octopus‐Like Adhesive Patches with Meniscus‐Controlled Unfoldable 3D Microtips for Underwater Surface and Hairy Skin

et al. 2018

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Adhesion capabilities of various skin architectures found in nature can generate remarkable physical interactions with their engaged surfaces. Among them, octopus suckers have unique hierarchical structures for reversible adhesion in dry and wet conditions. Here, highly adaptable, biocompatible, and repeatable adhesive patches with unfoldable, 3D microtips in micropillars inspired by the rim and infundibulum of octopus suction cup are presented. The bioinspired synthetic adhesives are fabricated by controlling the meniscus of a liquid precursor in a simple molding process without any hierarchical assemblies or additional surface treatments. Experimental and theoretical studies are investigated upon to increase the effective contact area between unfoldable microtips of devices, and enhance adhesion performances and adaptability on a Si wafer in both dry and underwater conditions (max. 11 N cm−2 in pull‐off strength) as well as on a moist pigskin (max. 14.6 mJ peeling energy). Moreover, the geometry‐controlled microsuckers exhibit high‐repeatability (over 100 cycles) in a pull‐off direction. The adhesive demonstrates stable attachments on a moist, hairy, and rough skin, without any observable chemical residues.

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mentioning

confidence: 83%

Highly Adaptable and Biocompatible Octopus‐Like Adhesive Patches with Meniscus‐Controlled Unfoldable 3D Microtips for Underwater Surface and Hairy Skin

et al. 2018

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“…[95] In a related technique, the geometry of 3D molds, which can be fabricated following traditional lithographic techniques, are augmented using the wetting properties of liquids (Figure 3B). [96] These properties are readily tuned by modifying the surface chemistry of the molds so that dispensed droplets either wet the walls of the mold or bead up as desired ( Figure 3B). Again, these droplets are immiscible in the prepolymer of the target PM, which is generated by first augmenting the geometry of the original template with the droplets and casting the prepolymer against it, resulting in complicated structures with concave and convex curvatures, as well as interpenetrating holes and arrayed posts ( Figure 3B).…”

Section: Liquid-based Mastersmentioning

confidence: 99%

Emergent Soft Lithographic Tools for the Fabrication of Functional Polymeric Microstructures

2019

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Polymeric microstructures (PMs) are useful to a broad range of technologies applicable to, for example, sensing, energy storage, and soft robotics. Due to the diverse application space of PMs, many techniques (e. g., photolithography, 3D printing, micromilling, etc.) have been developed to fabricate these structures. Stemming from their generality and unique capabilities, the tools encompassed by soft lithography (e. g., replica molding, microcontact printing, etc.), which use soft elastomeric materials as masters in the fabrication of PMs, are particularly relevant. By taking advantage of the characteristics of elastomeric masters, particularly their mechanical and chemical properties, soft lithography has enabled the use of non‐planar substrates and relatively inexpensive equipment in the generation of many types of PMs, redefining existing communities and creating new ones. Traditionally, these elastomeric masters have been produced from relief patterns fabricated using photolithography; however, recent efforts have led to the emergence of new methods that make use of masters that are self‐forming, dynamic in their geometric and chemical properties, 3D in architecture, and/or sacrificial (i. e., easily removed/released using phase changes). These “next generation” soft lithographic masters include self‐assembled liquid droplets, microscale balloons, templates derived from natural materials, and hierarchically microstructured surfaces. The new methods of fabrication supported by these unique masters enable access to numerous varieties of PMs (e. g., those with hierarchical microstructures, overhanging features, and 3D architectures) that would not be possible following established methods of soft lithography. This review explores these emergent soft lithographic methods, addressing their operational principles and the application space they can impact.

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“…[32][33][34][35][36] The patterns processed by photolithography provide confine geometry as well as lateral features for cellular adhesion. Due to the multiple features of the patterns this reduces the detrimental effects of cell arrays when cultured for longer time, in contrast to those of other patterning techniques.…”

Section: Photolithographymentioning

confidence: 99%

Fabrication of polymeric biomaterials: a strategy for tissue engineering and medical devices

2015

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Polymeric biomaterials have significant impact in today's health care technology. Polymer hydrogels were the first experimentally designed biomaterials for human use. In this article the design, synthesis and properties of hydrogels, derived from synthetic and natural polymers and their use as biomaterials in tissue engineering are reviewed. The stimuliresponsive hydrogels with controlled degradability and examples of suitable methods for designing such biomaterials, using multidisciplinary approaches from traditional polymer chemistry, materials engineering to molecular biology, have been discussed. Examples of the fabrication of polymer-based biomaterials, utilized for various cells type manipulations for tissue re-generation are also elaborated. Since a highly porous three-dimensional scaffold is crucially important in cellular process, for tissue engineering, recent advances in effective methods of scaffolds fabrication are described. Additionally, the incorporation of factor molecules for the enhancement of tissue formation and their controlled release are also elucidated in this article. Finally, the future challenges in the efficient fabrication of effective polymeric biomaterials in tissue regeneration and medical devices applications.

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Fabrication of 3D Microstructures from Interactions of Immiscible Liquids with a Structured Surface

Cited by 12 publications

References 34 publications

Highly Adaptable and Biocompatible Octopus‐Like Adhesive Patches with Meniscus‐Controlled Unfoldable 3D Microtips for Underwater Surface and Hairy Skin

Highly Adaptable and Biocompatible Octopus‐Like Adhesive Patches with Meniscus‐Controlled Unfoldable 3D Microtips for Underwater Surface and Hairy Skin

Emergent Soft Lithographic Tools for the Fabrication of Functional Polymeric Microstructures

Fabrication of polymeric biomaterials: a strategy for tissue engineering and medical devices

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