Capillary Origami Inspired Fabrication of Complex 3D Hydrogel Constructs

Li, Moxiao; Yang, Qingzhen; Liu, Hao; Qiu, Mushu; Lu, Tian Jian; Xu, Feng

doi:10.1002/smll.201601147

Cited by 37 publications

(21 citation statements)

References 50 publications

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“…As a result, different fabrication technologies, such as molding, micromolding, dip-coating, lithography, 3D printing, ionoprinting, capillary origami and ion inkjet printing, were utilized in the development of hydrogel-based actuators and are summarized in the following. 150 3.3.1 Molding. Molding is the most common and simple method to pattern large scale hydrogel actuators with the dimensions ranging from centimeters to millimeters.…”

Section: Fabrication Technologies Adopted In the Development Of Hydromentioning

confidence: 99%

Trends in polymeric shape memory hydrogels and hydrogel actuators

et al. 2019

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Section: Fabrication Technologies Adopted In the Development Of Hydromentioning

confidence: 99%

Trends in polymeric shape memory hydrogels and hydrogel actuators

et al. 2019

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“…Also, there is significant versatility as the self‐folding process is fairly material agnostic. Indeed, hydrogels and even atomically‐thin 2D materials, such as graphene and molybdenum disulfide (MoS 2 ), were recently self‐folded into microscopic polyhedral structures using capillary forces …”

Section: Theoretical Considerations and Relevant Parametersmentioning

confidence: 99%

Self‐Folding Using Capillary Forces

Kwok

Huang

Mastrangeli

et al. 2019

Adv Materials Inter

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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 self‐folded structures, from plant leaves to gut villi to cerebral gyri, abound in nature. From an engineering perspective, self‐folding of sub‐millimeter‐sized structures addresses major hurdles in nano‐ and micro‐manufacturing. 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. The major demonstrated classes of capillary force assisted self‐folding are discussed. These classes include the use of rigid or soft and micro‐ or nano‐patterned precursors that are assembled using a variety of liquids such as water, molten polymers, and liquid metals. The authors outline the underlying physics and highlight important design considerations that maximize rigidity, strength, and yield of the assembled structures. They also discuss applications of capillary self‐folding structures in engineering and medicine. Finally, the authors conclude by summarizing standing challenges and describing future trends.

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“…Assembly strategy from building blocks is also developed to construct microparticles with nonspherical shapes . Besides, liquid bridge method and capillary origami method are exploited to fabricate complex 3D shapes . Using liquid crystalline elastomers, highly shape‐anisotropic particles in response to a certain external stimulus are synthesized by microfluidics .…”

Section: Introductionmentioning

confidence: 99%

Creation of Nonspherical Microparticles through Osmosis‐Driven Arrested Coalescence of Microfluidic Emulsions

Feng

Gao

Zhang

et al. 2019

Small

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Droplet‐based microfluidics enable the production of emulsions and microparticles with spherical shapes, but the high‐throughput fabrication of nonspherical emulsions and microparticles still remains challenging because interfacial tension plays a dominant role during preparation. Herein, ionic liquids (ILs) containing salts, which possess sufficient osmotic pressure to realize water transport and phase separation, are introduced as inner cores of oil‐in‐oil‐in‐water double emulsions and it is shown that nonspherical emulsions can be constructed by osmosis‐driven arrested coalescence of inner cores. Subsequently, ultraviolet polymerization of the nonspherical emulsions leads to nonspherical microparticles. By tailoring the number, composition, and size of inner cores as well as coalescence time, a variety of nonspherical shapes such as dumbbell, rod, spindle, snowman, tumbler, three‐pointed star, triangle, and scalene triangle are created. Importantly, benefitting from excellent solvency of ILs, this system can serve as a general platform to produce nonspherical microparticles made from different materials. Moreover, by controlling the osmotic pressure, programmed coalescence of inner cores in double emulsions is realizable, which indicates the potential to build microreactors. Thus, a simple and high‐throughput strategy to create nonspherical microparticles with arrested coalescence shapes is developed for the first time and can be further used to construct novel materials and microreactors.

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Capillary Origami Inspired Fabrication of Complex 3D Hydrogel Constructs

Cited by 37 publications

References 50 publications

Trends in polymeric shape memory hydrogels and hydrogel actuators

Trends in polymeric shape memory hydrogels and hydrogel actuators

Self‐Folding Using Capillary Forces

Creation of Nonspherical Microparticles through Osmosis‐Driven Arrested Coalescence of Microfluidic Emulsions

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