Wet‐Responsive, Reconfigurable, and Biocompatible Hydrogel Adhesive Films for Transfer Printing of Nanomembranes

Yi, Hoon; Seong, Minho; Sun, Kahyun; Hwang, Il Soon; Lee, Kangseok; Cha, Chaenyung; Kim, Tae Il; Jeong, Hoon Eui

doi:10.1002/adfm.201706498

Cited by 86 publications

(73 citation statements)

References 65 publications

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“…Controlling geometric features such as size and biphasic property of tips, as well as curvatures benefited mimicking of the adhesive phenomena and structures of natural surfaces. Moreover, adhesives with biologically inspired architectures for skin and inner organs require features such as high biocompatibility, air permeability, adaptability, and flexibility to comply with the nonflat surfaces of the human body. By orchestrating both geometric and materials parameters, adhesives with synthetic, bioinspired architectures have been optimized for greater adhesive performances and versatility to industrial purposes from robotics to medical applications (see Table for structural and material properties).…”

Section: Fabrication Methods For Bioinspired Adhesive Architecturesmentioning

confidence: 99%

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

et al. 2019

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on dry and rough surfaces (maximum ≈10 N cm −2 ). [1] Close observations have indicated nanoscale hairs of high aspect ratio (AR) with slated tips. [21][22][23][24][25][26][27][28][29][30] This geometry allows directional appliance of van der Waals forces against engaged surfaces for stable attachment. The attachment strategies and fixation systems of beetles have also been investigated. [9] Concave, mushroom-shaped architectures on the forelegs of beetles ensure stable adherences onto rough, waxy surfaces [31][32][33][34][35][36] or locomotion via capillary adhesion. [37][38][39] Studies on their attachment systems revealed that the mushroom-shaped structures with wide concave tips can generate van der Waals interactions [40] as well as a suction effect against engaged surfaces. [41,42] Moreover, needles located in the proboscis of mosquitos [43][44][45][46] or endoparasites (e.g., Pomphorhynchus laevis) [47] alike, induce mechanical interlocking on dry skin or wet organs. The needles provide strong adhesion in both normal and shear directions for the insect species to easily consume nutrients. Recently, the architectures of octopus suckers were investigated to understand their underlying attachment mechanism. Existing in clusters on octopus tentacles, suction cups are crucial for octopi's survival underwater for functions such as preying, grasping, locomotion, and even sensing. The cup-shaped protruding chamber (infundibulum) is known to adapt and seal conformably on rough surfaces. [12,13,15,48] Meanwhile, the dome-like protuberance in the lower chamber (acetabulum) forms pressure difference between the segregated lower and upper chambers within the suction cup architecture. [49] This enhances suction stress to adhere strongly onto wet or underwater surfaces. The footpads of slugs are covered with structures of microscale compression waves with viscous mucus. This can be used to both lubricate a slug's movement over surfaces and facilitate the transfer of adhesive force to the engaged surfaces. [16,19,20,[50][51][52] Specifically, the mucus with interpenetrating positively charged chemistries produce pedal waves; this in all creates an adhesive and elastic dissipative matrix, and guides the movement of slugs on attached surfaces. [53] Hence, structural features within the as-mentioned organisms have built the platform of bioinspired adhesive systems for potential use in clean transfer systems, [54][55][56][57][58][59] soft robotics, [60,61] stimuli-responsive adhesives for dry or wet surfaces, [62][63][64] and various wearable devices with diagnostic and therapeutic functionalities. [65][66][67][68][69] Among various applications of bioinspired multiscale architectures, patches attachable to skin have been of high interest (Figure 1b). Human skin, the outermost organ of the human The attachment phenomena of various hierarchical architectures found in nature have extensively drawn attention for developing highly biocompatible adhesive on skin or wet inner organs without any chemical glue. Structural adhesive sy...

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Section: Fabrication Methods For Bioinspired Adhesive Architecturesmentioning

confidence: 99%

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

et al. 2019

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“…[185] The elastomer is initially smooth and spherical, however, when brought into contact with the hydrogel substrate water diffuses into the elastomer causing it to swell. Yi et al also accomplished switching with microstructured poly(ethylene glycol) dimethacrylate hydrogel surfaces for transfer printing, with SR of 640 and switching times of 150 s. [184] This approach shows potential for reduced switching times with patterned interfaces as they will reduce diffusion lengths. [188] The increased surface topography leads to a time-controlled adhesion switch.…”

Section: Swellingmentioning

confidence: 99%

Section: Swellingmentioning

confidence: 99%

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Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

125

107

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The reliable bonding or attachment of materials is critical in many industries, is a common necessity of daily life, and is key to functionality in numerous biological settings. [1][2][3][4][5][6][7][8][9][10][11] Adhesives Joining two materials with an adhesive is an extremely common activity, but is most often irreversible. However, emerging and current applications ranging from consumer and medical products to soft robotics and wearable bio-monitoring devices demand strong adhesives which can be easily removed on-demand and subsequently reused. This requires new paradigms in adhesive science and engineering, resulting in the emergence of new classes of multifunctional switchable adhesives. Here summarized is the current state of the art in switchable adhesive systems, focusing on how devices fit into the basic science of adhesion while providing performance metrics for comparison across current approaches. Using fracture mechanics as a guide, systems are classified as functioning under one of three basic mechanisms: near-interface, contact area, or mechanical. These mechanisms must be initiated or "triggered" by a specific input, which can include mechanical, electromagnetic, fluidic, or thermal stimuli. Triggers and adhesion switching performance are compared through the use of a "switching ratio," the interfacial energy release rate, and an estimate of mechanism timing. Finally, it is discussed that how the fundamental mechanisms relate to challenges and opportunities for switchable interfaces in future applications and adhesive systems.

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“…Facile tunability over the sensitivity and detection range is also essential, as different sensitivities and working ranges are required for different applications . Furthermore, e‐skins should have a simple device structure to enable low‐cost and scalable fabrication …”

Section: Introductionmentioning

confidence: 99%

Hybrid Architectures of Heterogeneous Carbon Nanotube Composite Microstructures Enable Multiaxial Strain Perception with High Sensitivity and Ultrabroad Sensing Range

Sun

Park

et al. 2018

Small

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201803411.Low-dimensional nanomaterials are widely adopted as active sensing elements for electronic skins. When the nanomaterials are integrated with microscale architectures, the performance of the electronic skin is significantly altered. Here, it is shown that a high-performance flexible and stretchable electronic skin can be produced by incorporating a piezoresistive carbon nanotube composite into a hierarchical topography of micropillar-wrinkle hybrid architectures that mimic wrinkles and folds in human skin. Owing to the unique hierarchical topography of the hybrid architectures, the hybrid electronic skin exhibits versatile and superior sensing performance, which includes multiaxial force detection (normal, bending, and tensile stresses), remarkable sensitivity (20.9 kPa −1 , 17.7 mm −1 , and gauge factor of 707 each for normal, bending, and tensile stresses), ultrabroad sensing range (normal stress = 0-270 kPa, bending radius of curvature = 1-6.5 mm, and tensile strain = 0-50%), sensing tunability, fast response time (24 ms), and high durability (>10 000 cycles). Measurements of spatial distributions of diverse mechanical stimuli are also demonstrated with the multipixel electronic skin. The stress-strain behavior of the hybrid structure is investigated by finite element analysis to elucidate the underlying principle of the superior sensing performance of the electronic skin. Electronic Skins www.advancedsciencenews.com

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Wet‐Responsive, Reconfigurable, and Biocompatible Hydrogel Adhesive Films for Transfer Printing of Nanomembranes

Cited by 86 publications

References 65 publications

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

Switchable Adhesives for Multifunctional Interfaces

Hybrid Architectures of Heterogeneous Carbon Nanotube Composite Microstructures Enable Multiaxial Strain Perception with High Sensitivity and Ultrabroad Sensing Range

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