Vat Photopolymerization 3D Printing of Advanced Soft Sensors and Actuators: From Architecture to Function

Zhao, Wenyu; Wang, Ziya; Zhang, Jianpeng; Wang, Xiaopu; Xu, Yingtian; Ding, Ning; Peng, Zhengchun

doi:10.1002/admt.202001218

Cited by 63 publications

(43 citation statements)

References 286 publications

(299 reference statements)

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“…where N is the number of the papillae that contact with the droplet from the lateral view, D and L are the diameter and spacing of the papillae, respectively. Assume that the wetting state of the papillae arrays belong to CB M -CB m model, the solid-liquid contact area equals the projected area and the water contact angles on these papillae arrays can be predicted according to Equation (2). The projected area (S SL ) of the solid-liquid interface can be calculated by S SL = π(d/2) 2 .…”

Section: Superhydrophobic Papillae Arrays For Microdroplet Manipulationmentioning

confidence: 99%

“…Controllable fabrication of hierarchical microarchitectures is of great significance for applications as diverse as soft actuators, [1,2] stretchable electronics, [3,4] cell culture, [5] water harvesting, [6,7] and microdroplet manipulation. [8,9] Although lithography and 3D printing techniques have been widely used to fabricate microarchitectures across multiple length scales, [10][11][12] it is still challenging to realize large-area fabrication of hierarchical microarchitecture arrays on curved substrates.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cortical‐Folding‐Inspired Multifunctional Reduced Graphene Oxide Microarchitecture Arrays on Curved Substrates

Tan

Kang

et al. 2021

Adv Materials Technologies

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and low-cost method, surface wrinkling of thin films on soft substrates has been developed to generate various functional micro/nanostructures (e.g., wrinkles, creases, crumples, and folds) on planar and curved substrates. [13][14][15][16] These wrinkling structures with tunable surface-wetting, electronical, and mechanical properties bring great potentials for emerging applications including flexible electronics, [17][18][19] reversible patterning, [20][21][22] smart wetting surfaces, [23][24][25] and actuators. [26,27] Compared with traditional microfabrication methods, surface wrinkling shows advantages (e.g., template-free, simple, and low-cost) in the fabrication of microarchitecture arrays on curved substrates. [15] Many efforts have been put into the controlled wrinkling of metal coatings, polymer films, and oxide layers on curved surfaces through thermal shrinkage, [28,29] negative pressure, [30,31] and swelling/ deswelling. [32,33] Due to fascinated thermal, electrical, and optical properties, strain engineering of 2D materials has become a hot research topic. [34,35] Graphene oxide (GO), because of excellent flexibility and rich oxygen-containing groups, is suitable to form conformal coatings on various curved substrates. [36,37] Diverse functional wrinkled structures have been achieved via the wrinkling of GO films on spherical and cylindrical substrates, such as highly-convoluted patterns for deforming actuators, [27] hierarchical ridges for strain sensors, [38,39] and multigenerational crumples for anticounterfeiting patterns. [40] Recently, inspired by the hierarchical papillae of the rose petal, we obtained superhydrophobic papillae arrays by the wrinkling of nonuniform GO films coated on spherical latex substrates. [8] Although it provides a feasible method for fabricating hierarchical architecture arrays on curved substrates, there are still some issues: i) Only millimeter-scale architectures (>0.6 mm) could be obtained because of the restriction of the coating technique, which limits their applications in largearea micro/nanofabrication of architecture arrays on curved substrates. ii) The previous work mainly focuses on the surfacewetting properties of the papillae whereas mechanical stability of the wrinkled papillae arrays has not yet been demonstrated. iii) Most importantly, although the wrinkling of single-layer stiff or soft films on curved substrates has been investigated, [15,27,31] the folding of stiff/soft bilayers with large modulus contrast Although controlled wrinkling is demonstrated to be a powerful tool for micro/nanofabrication, large-area fabrication of microarchitecture arrays on curved substrates by surface wrinkling still remains challenging. Inspired by the cortical folding, a facile method for transforming graphene oxide (GO) patterns into multiscale microarchitecture arrays on curved substrates is developed. Mass production of hierarchical GO papillae arrays can be realized by homogeneous compression of patterned GO/rubber bilayers. The reduced GO (rGO) papillae arrays sho...

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Section: Superhydrophobic Papillae Arrays For Microdroplet Manipulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cortical‐Folding‐Inspired Multifunctional Reduced Graphene Oxide Microarchitecture Arrays on Curved Substrates

Tan

Kang

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…Additive manufacturing, often termed 3D printing, is a comprehensive materials development technique which has gained signification attention following its discovery in the 1980s [1][2][3][4][5][6][35][36][37]. At present this technology is experiencing significant growth and can now be applied using a wide range of methods, including material jetting [38,39], binder jetting [40,41], material extrusion [42][43][44][45][46], powder bed fusion [47,48], vat photopolymerization [37,[49][50][51][52][53], and sheet lamination [35,36,54,55].…”

Section: Introductionmentioning

confidence: 99%

A Review of Multi-Material 3D Printing of Functional Materials via Vat Photopolymerization

2022

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Additive manufacturing or 3D printing of materials is a prominent process technology which involves the fabrication of materials layer-by-layer or point-by-point in a subsequent manner. With recent advancements in additive manufacturing, the technology has excited a great potential for extension of simple designs to complex multi-material geometries. Vat photopolymerization is a subdivision of additive manufacturing which possesses many attractive features, including excellent printing resolution, high dimensional accuracy, low-cost manufacturing, and the ability to spatially control the material properties. However, the technology is currently limited by design strategies, material chemistries, and equipment limitations. This review aims to provide readers with a comprehensive comparison of different additive manufacturing technologies along with detailed knowledge on advances in multi-material vat photopolymerization technologies. Furthermore, we describe popular material chemistries both from the past and more recently, along with future prospects to address the material-related limitations of vat photopolymerization. Examples of the impressive multi-material capabilities inspired by nature which are applicable today in multiple areas of life are briefly presented in the applications section. Finally, we describe our point of view on the future prospects of 3D printed multi-material structures as well as on the way forward towards promising further advancements in vat photopolymerization.

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“…Currently, 3D soft robots are typically manufactured through 3D printing and assembly with small actuators 12 , 13 . Compared to 3D shapes, 2D shapes are more space-efficient in terms of their spatial dimension 14 .…”

Section: Introductionmentioning

confidence: 99%

Origami-inspired folding assembly of dielectric elastomers for programmable soft robots

Sun

et al. 2022

Microsyst Nanoeng

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Origami has become an optimal methodological choice for creating complex three-dimensional (3D) structures and soft robots. The simple and low-cost origami-inspired folding assembly provides a new method for developing 3D soft robots, which is ideal for future intelligent robotic systems. Here, we present a series of materials, structural designs, and fabrication methods for developing independent, electrically controlled origami 3D soft robots for walking and soft manipulators. The 3D soft robots are based on soft actuators, which are multilayer structures with a dielectric elastomer (DE) film as the deformation layer and a laser-cut PET film as the supporting flexible frame. The triangular and rectangular design of the soft actuators allows them to be easily assembled into crawling soft robots and pyramidal- and square-shaped 3D structures. The crawling robot exhibits very stable crawling behaviors and can carry loads while walking. Inspired by origami folding, the pyramidal and square-shaped 3D soft robots exhibit programmable out-of-plane deformations and easy switching between two-dimensional (2D) and 3D structures. The electrically controllable origami deformation allows the 3D soft robots to be used as soft manipulators for grasping and precisely locking 3D objects. This work proves that origami-inspired fold-based assembly of DE actuators is a good reference for the development of soft actuators and future intelligent multifunctional soft robots.

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Vat Photopolymerization 3D Printing of Advanced Soft Sensors and Actuators: From Architecture to Function

Cited by 63 publications

References 286 publications

Cortical‐Folding‐Inspired Multifunctional Reduced Graphene Oxide Microarchitecture Arrays on Curved Substrates

Cortical‐Folding‐Inspired Multifunctional Reduced Graphene Oxide Microarchitecture Arrays on Curved Substrates

A Review of Multi-Material 3D Printing of Functional Materials via Vat Photopolymerization

Origami-inspired folding assembly of dielectric elastomers for programmable soft robots

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