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Self-folding using capillary forces. / Kwok, Kam Sang; Huang, Qi; Mastrangeli, Massimo; Gracias, David.

In: Advanced Materials Interfaces, 09.12.2019.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Kwok, KS, Huang, Q, Mastrangeli, M & Gracias, D 2019, 'Self-folding using capillary forces' Advanced Materials Interfaces. https://doi.org/10.1002/admi.201901677

APA

Kwok, K. S., Huang, Q., Mastrangeli, M., & Gracias, D. (2019). Self-folding using capillary forces. Advanced Materials Interfaces, [1901677]. https://doi.org/10.1002/admi.201901677

Vancouver

Kwok KS, Huang Q, Mastrangeli M, Gracias D. Self-folding using capillary forces. Advanced Materials Interfaces. 2019 Dec 9. 1901677. https://doi.org/10.1002/admi.201901677

Author

Kwok, Kam Sang ; Huang, Qi ; Mastrangeli, Massimo ; Gracias, David. / Self-folding using capillary forces. In: Advanced Materials Interfaces. 2019.

BibTeX

@article{eae15f1bd406422ab7f0de433960e17d,
title = "Self-folding using capillary forces",
abstract = "Self-folding broadly refers to the assembly of 3D structures by bending, curving, and folding without the need for manual or mechanized intervention. Self-folding is scientifically interesting because examples of self-folded structures, from plant leaves to gut villi to cerebral gyri, abound in nature. From an engineering and technological perspective, self-folding of sub-millimeter-sized structures addresses major hurdles in nano- and micromanufacturing. At these size scales, it is prohibitively difficult to assemble 3D structures using conventional probes in a scalable, cost-effective, and mass-producible manner. This review focuses on self-folding using surface tension or capillary forces derived from the minimization of liquid interfacial area. Due to favorable downscaling with length, at small scales capillary forces become extremely large relative to forces that scale with volume, such as gravity or inertia, and to forces that scale with area, such as elasticity. We discuss the major demonstrated classes of capillary force assisted self-folding. These classes include the use of rigid or soft and micro- or nanopatterned precursors that are assembled using a variety of liquids such as water, molten polymers, and liquid metals. We outline the underlying physics and highlight important design considerations that maximize rigidity, strength, and yield of the assembled structures. We also discuss applications of capillary self-folding structures in engineering and medicine. Finally, we conclude by summarizing standing challenges and describing future trends.",
keywords = "self-folding, surface tension, capillarity, Microsystems, nanoengineering, Soft materials, micromachining, MEMS, MOEMS, NEMS, Metamaterials, scaling",
author = "Kwok, {Kam Sang} and Qi Huang and Massimo Mastrangeli and David Gracias",
year = "2019",
month = "12",
day = "9",
doi = "10.1002/admi.201901677",
language = "English",
journal = "Advanced Materials Interfaces",
issn = "2196-7350",
publisher = "John Wiley & Sons",

}

RIS

TY - JOUR

T1 - Self-folding using capillary forces

AU - Kwok, Kam Sang

AU - Huang, Qi

AU - Mastrangeli, Massimo

AU - Gracias, David

PY - 2019/12/9

Y1 - 2019/12/9

N2 - Self-folding broadly refers to the assembly of 3D structures by bending, curving, and folding without the need for manual or mechanized intervention. Self-folding is scientifically interesting because examples of self-folded structures, from plant leaves to gut villi to cerebral gyri, abound in nature. From an engineering and technological perspective, self-folding of sub-millimeter-sized structures addresses major hurdles in nano- and micromanufacturing. At these size scales, it is prohibitively difficult to assemble 3D structures using conventional probes in a scalable, cost-effective, and mass-producible manner. This review focuses on self-folding using surface tension or capillary forces derived from the minimization of liquid interfacial area. Due to favorable downscaling with length, at small scales capillary forces become extremely large relative to forces that scale with volume, such as gravity or inertia, and to forces that scale with area, such as elasticity. We discuss the major demonstrated classes of capillary force assisted self-folding. These classes include the use of rigid or soft and micro- or nanopatterned precursors that are assembled using a variety of liquids such as water, molten polymers, and liquid metals. We outline the underlying physics and highlight important design considerations that maximize rigidity, strength, and yield of the assembled structures. We also discuss applications of capillary self-folding structures in engineering and medicine. Finally, we conclude by summarizing standing challenges and describing future trends.

AB - Self-folding broadly refers to the assembly of 3D structures by bending, curving, and folding without the need for manual or mechanized intervention. Self-folding is scientifically interesting because examples of self-folded structures, from plant leaves to gut villi to cerebral gyri, abound in nature. From an engineering and technological perspective, self-folding of sub-millimeter-sized structures addresses major hurdles in nano- and micromanufacturing. At these size scales, it is prohibitively difficult to assemble 3D structures using conventional probes in a scalable, cost-effective, and mass-producible manner. This review focuses on self-folding using surface tension or capillary forces derived from the minimization of liquid interfacial area. Due to favorable downscaling with length, at small scales capillary forces become extremely large relative to forces that scale with volume, such as gravity or inertia, and to forces that scale with area, such as elasticity. We discuss the major demonstrated classes of capillary force assisted self-folding. These classes include the use of rigid or soft and micro- or nanopatterned precursors that are assembled using a variety of liquids such as water, molten polymers, and liquid metals. We outline the underlying physics and highlight important design considerations that maximize rigidity, strength, and yield of the assembled structures. We also discuss applications of capillary self-folding structures in engineering and medicine. Finally, we conclude by summarizing standing challenges and describing future trends.

KW - self-folding

KW - surface tension

KW - capillarity

KW - Microsystems

KW - nanoengineering

KW - Soft materials

KW - micromachining

KW - MEMS

KW - MOEMS

KW - NEMS

KW - Metamaterials

KW - scaling

U2 - 10.1002/admi.201901677

DO - 10.1002/admi.201901677

M3 - Article

JO - Advanced Materials Interfaces

T2 - Advanced Materials Interfaces

JF - Advanced Materials Interfaces

SN - 2196-7350

M1 - 1901677

ER -

ID: 66484716