Fracture-based micro- and nanofabrication for biological applications

Kim, Byoung Choul; Moraes, Christopher; Huang, Jian; Thouless, M.D.; Takayama, Shuichi

doi:10.1039/c3bm60276a

Cited by 32 publications

(23 citation statements)

References 77 publications

(156 reference statements)

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“…Subsequently, cells attached specifically to these agents and formed web patterns. The crack dimensions and their geometries could be tailored through the applied force and prepatterning of the layer, respectively . Linear cracks of dimensions smaller than the cell diameters were used to investigate rapid unidirectional cell growth by similarity to growth along an extracellular matrix …”

Section: Guiding Organismsmentioning

confidence: 99%

A Perspective on Bio‐Mediated Material Structuring

et al. 2017

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Bioinspiration, biomorphy, biomimicry, biomimetics, bionics, and biotemplating are terms used to describe the fabrication of materials or, more generally, systems to solve technological problems by abstracting, emulating, using, or transferring structures from biological paradigms. Herein, a brief overview of how the different terminologies are being typically applied is provided. It is proposed that there is a rich field of research that can be expanded by utilizing various novel approaches for the guidance of living organisms for "bio-mediated" material structuring purposes. As examples of contact-based or contact-free guidance, such as substrate patterning, the application of light, magnetic fields, or chemical gradients, potentially interesting methods of creating hierarchically structured monolithic engineering materials, using live patterned biomass, biofilms, or extracellular substances as scaffolds, are presented. The potential advantages of such materials are discussed, and examples of live self-patterning of materials are given.

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Section: Guiding Organismsmentioning

confidence: 99%

A Perspective on Bio‐Mediated Material Structuring

et al. 2017

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“…Besides, due to regular cracking, an array of nanochannels (the cracks with tens of nanometers in width) was produced, as shown in Fig. 3(g), which might be of potential applications in biology as nanofluid devices [45][46][47][48].…”

Section: Characterization Of Splatsmentioning

confidence: 99%

Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology

Chen

Yang

2017

J Adv Ceram

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Thermally sprayed coatings are essentially layered materials and contain large numbers of lamellar pores. It is thus quite necessary to clarify the formation mechanism of lamellar pores which significantly influence coating performances. In the present study, to elaborate the formation mechanism of lamellar pores, the yttria-stabilized zirconia (ZrO 2 -7 wt% Y 2 O 3 , 7YSZ) splats, which have high fracture toughness and tetragonal phase stability, were employed. Interestingly, anomalous epitaxial growth occurred for all deposition temperatures in spite of the extremely high cooling rate, which clearly indicated chemical bonding and complete contact at splat/substrate interface before splat cooling. However, transverse spallation substantially occurred for all deposition temperatures in spite of the high fracture toughness of 7YSZ, which revealed that the lamellar pores were from transverse cracking/spallation due to the large stress during splat cooling. Additionally, fracture mechanics analysis was carried out, and it was found that the stress arose from the constraint effect of the shrinkage of the splat by locally heated substrate with the value about 1.97 GPa. This clearly demonstrated that the stress was indeed large enough to drive transverse cracking/spallation forming lamellar pores during splat cooling. All of these contribute to understanding the essential features of lamellar bonding and further tailoring the coating structures and performance.

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“…With the substrate stretched perpendicularly to that direction a crack is formed at the soft island’s tip (see Figure 1). While other groups have used large aspect ratio surface patterns like notches to start cracks [26,27,28], the soft islands presented here are the first planar patterns used for that purpose. We have found that the strain needed for that crack formation increases with increasing curvature radius of the island’s tip.…”

Section: Introductionmentioning

confidence: 99%

Controlled Mechanical Cracking of Metal Films Deposited on Polydimethylsiloxane (PDMS)

et al. 2016

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Stretchable large area electronics conform to arbitrarily-shaped 3D surfaces and enables comfortable contact to the human skin and other biological tissue. There are approaches allowing for large area thin films to be stretched by tens of percent without cracking. The approach presented here does not prevent cracking, rather it aims to precisely control the crack positions and their orientation. For this purpose, the polydimethylsiloxane (PDMS) is hardened by exposure to ultraviolet radiation (172 nm) through an exposure mask. Only well-defined patterns are kept untreated. With these soft islands cracks at the hardened surface can be controlled in terms of starting position, direction and end position. This approach is first investigated at the hardened PDMS surface itself. It is then applied to conductive silver films deposited from the liquid phase. It is found that statistical (uncontrolled) cracking of the silver films can be avoided at strain below 35%. This enables metal interconnects to be integrated into stretchable networks. The combination of controlled cracks with wrinkling enables interconnects that are stretchable in arbitrary and changing directions. The deposition and patterning does not involve vacuum processing, photolithography, or solvents.

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Fracture-based micro- and nanofabrication for biological applications

Cited by 32 publications

References 77 publications

A Perspective on Bio‐Mediated Material Structuring

A Perspective on Bio‐Mediated Material Structuring

Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology

Controlled Mechanical Cracking of Metal Films Deposited on Polydimethylsiloxane (PDMS)

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