Nonlinear Frameworks for Reversible and Pluripotent Wetting on Topographic Surfaces

Kim, Junsoo; Wang, Yifan; Park, Hyunchul; Park, Min Cheol; Moon, Seung Eon; Hong, Soon Man; Koo, Chong Min; Suh, Kahp Y.; Yang, Shu; Cho, Hyesung

doi:10.1002/adma.201605078

Cited by 20 publications

(16 citation statements)

References 35 publications

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“…The observed cracks may have resulted from a number of factors, including the strong surface tension of the water pulling the graphene/PMMA layer as it dried, the interfacial energy between the graphene and the PEG surface, and/or the degree of resistance of the PMMA/graphene layer to deformation. The capacity for the PMMA/graphene layer to bend would be affected by both the elastic modulus of the material and the dimensions of the substrate patterns 9 . It is possible that the exact mechanism responsible for the cracks forming as observed is highly complex, due to the simultaneous involvement of a polymeric surface, a solid surface, a liquid interface, and topography.…”

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confidence: 99%

Micro- and nano-patterned conductive graphene–PEG hybrid scaffolds for cardiac tissue engineering

Smith

Yoo

et al. 2017

Chem. Commun.

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A lack of electrical conductivity and structural organization in currently available biomaterial scaffolds limits their utility for generating physiologically representative models of functional cardiac tissue. Here we report on the development of scalable, graphene-functionalized topographies with anisotropic electrical conductivity for engineering the structural and functional phenotypes of macroscopic cardiac tissue constructs. Guided by anisotropic electroconductive and topographic cues, the tissue constructs displayed structural property enhancement in myofibrils and sarcomeres, and exhibited significant increases in the expression of cell-cell coupling and calcium handling proteins, as well as in action potential duration and peak calcium release.

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confidence: 99%

Micro- and nano-patterned conductive graphene–PEG hybrid scaffolds for cardiac tissue engineering

Smith

Yoo

et al. 2017

Chem. Commun.

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“…Since the surface of the pristine microbomb is rough, imprinting on the clusters offers an alternative way to create smooth facets together with introducing hierarchical cleavages. Previously, we demonstrated the creation of structural hierarchy within flexible, free-standing membranes 37 , 38 together with multilevel structures 33 . Here topographic assemblies with a hierarchy are obtained by nanoimprinting the microbombs during their expansion and topographic clustering.…”

Section: Resultsmentioning

confidence: 99%

Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs

Cho

Hong

et al. 2017

Nat Commun

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Designing topographic clusters is of significant interest, yet it remains challenging as they often lack mobility or deformability. Here we exploit the huge volumetric expansion (up to 3000%) of a new type of building block, thermally expandable microbombs. They consist of a viscoelastic polymeric shell and a volatile gas core, which, within structural confinement, create micro-clusters via inverse jamming and topographical close-packing. Upon heating, microbombs anchored in rigid confinement underwent balloon-like blowing up, allowing for dense clusters via soft interplay between viscoelastic shells. Importantly, the confinement is unyielding against the internal pressure of the microbombs, thereby enabling self-assembled clusters, which can be coupled with topographic inscription to introduce structural hierarchy on the clusters. Our strategy provides densely packed yet ultralight clusters with a variety of complex shapes, cleavages, curvatures, and hierarchy. In turn, these clusters will enrich our ability to explore the assemblies of the ever-increasing range of microparticle systems.

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“…However, an implementation of polymeric flexible materials has its benefits, such as inducing folding/crumpling phenomena during the fabrication process, which leads to a limit in the aperture size and thickness [9,10]. To address these issues, a polymeric nano-aperture membrane monolithically constructed on a supporting layer with micro-apertures was reported previously [11,12]. The one-step process based on the scavenging effect of the infiltrated oxygen gas is highly advantageous in the facile fabrication of free-standing membranes with nano/micro two-level apertures.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Structural Stability for Monolithic Nano Bridges on Micro Apertures

et al. 2020

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The instability of polymeric membranes with nano- and micro-sized apertures has been regarded as one of the main reasons behind realizing ultra-thin membranes with apertures. As is well known, when the thickness of the membrane gets thinner or the aperture size gets smaller, the possibility of geometrical deformation or structural damage by collapse or fracture increases. Herein, we suggest the design rules for the stability of polymeric membranes possessing 1D nano-line patterns monolithically constructed on micro-aperture supporting layers. The proposed theoretical model, which has been thoroughly demonstrated and analyzed based on both theoretical and experimental approaches, provides stability criteria for lateral collapse and vertical fracture of ultra-thin membranes with apertures.

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Nonlinear Frameworks for Reversible and Pluripotent Wetting on Topographic Surfaces

Cited by 20 publications

References 35 publications

Micro- and nano-patterned conductive graphene–PEG hybrid scaffolds for cardiac tissue engineering

Micro- and nano-patterned conductive graphene–PEG hybrid scaffolds for cardiac tissue engineering

Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs

Investigation of Structural Stability for Monolithic Nano Bridges on Micro Apertures

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