3D Bioinspired Microstructures for Switchable Repellency in both Air and Liquid

Liu, Xiaojiang; Gu, Hongcheng; Ding, Haibo; Du, Xin; Wei, Mengxiao; Chen, Qiang; Gu, Zhengrong

doi:10.1002/advs.202000878

Cited by 21 publications

(17 citation statements)

References 59 publications

(19 reference statements)

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“…where T A ( T A = S A × N A ) and T B ( T B = S B × N B ) are the thicknesses of Part A and Part B; E A and E B are the Young's modulus of Part A and Part B, respectively. It is reasonable to roughly describe the Young's modulus by laser dose per unit area D a [ 20 ] (details are shown in Scheme S2 in the Supporting Information) as:

\begin{matrix} E \sim D_{a} = \frac{L_{p}^{2}}{V S_{_{(or B)}} S_{Z}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Capillary‐Force‐Driven Self‐Assembly of 4D‐Printed Microstructures

et al. 2021

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Capillary‐force‐driven self‐assembly is emerging as a significant approach for the massive manufacture of advanced materials with novel wetting, adhesion, optical, mechanical, or electrical properties. However, academic value and practical applications of the self‐assembly are greatly restricted because traditional micropillar self‐assembly is always unidirectional. In this work, two‐photon‐lithography‐based 4D microprinting is introduced to realize the reversible and bidirectional self‐assembly of microstructures. With asymmetric crosslinking densities, the printed vertical microstructures can switch to a curved state with controlled thickness, curvature, and smooth morphology that are impossible to replicate by traditional 3D‐printing technology. In different evaporating solvents, the 4D‐printed microstructures can experience three states: (I) coalesce into clusters from original vertical states via traditional self‐assembly, (II) remain curved, or (III) arbitrarily self‐assemble (4D self‐assembly) toward the curving directions. Compared to conventional approaches, this 4D self‐assembly is distance‐independent, which can generate varieties of assemblies with a yield as high as 100%. More importantly, the three states can be reversibly switched, allowing the development of many promising applications such as reversible micropatterns, switchable wetting, and dynamic actuation of microrobots, origami, and encapsulation.

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\begin{matrix} E \sim D_{a} = \frac{L_{p}^{2}}{V S_{_{(or B)}} S_{Z}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Capillary‐Force‐Driven Self‐Assembly of 4D‐Printed Microstructures

et al. 2021

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“…However, from another point of view, the capillary force can be exploited as a valuable tool to drive microstructures. Compared with the other driving forces of microactuators such as magnetism, pH, and light, capillary force features the advantages of simplicity, low cost, scalability, and tunability [ 88 , 89 , 90 ].…”

Section: Stimulus Methods Of Microactuatorsmentioning

confidence: 99%

Tethered and Untethered 3D Microactuators Fabricated by Two-Photon Polymerization: A Review

et al. 2021

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Microactuators, which can transform external stimuli into mechanical motion at microscale, have attracted extensive attention because they can be used to construct microelectromechanical systems (MEMS) and/or microrobots, resulting in extensive applications in a large number of fields such as noninvasive surgery, targeted delivery, and biomedical machines. In contrast to classical 2D MEMS devices, 3D microactuators provide a new platform for the research of stimuli-responsive functional devices. However, traditional planar processing techniques based on photolithography are inadequate in the construction of 3D microstructures. To solve this issue, researchers have proposed many strategies, among which 3D laser printing is becoming a prospective technique to create smart devices at the microscale because of its versatility, adjustability, and flexibility. Here, we review the recent progress in stimulus-responsive 3D microactuators fabricated with 3D laser printing depending on different stimuli. Then, an outlook of the design, fabrication, control, and applications of 3D laser-printed microactuators is propounded with the goal of providing a reference for related research.

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“…As an additive manufacturing technology, 3D printing is widely used in the preparation of biologically inspired surfaces due to its advantages in rapid prototyping, flexibility, and ability to fabricate complex shapes. 3D printing technology accurately fabricates microstructure surfaces with various morphologies for desired functions [136][137][138][139][140] and even creates novel surface morphologies that cannot be found in nature. [141] For example, microball, zigzag microbeam, micromushroom, and suspended micro-cross arrays were fabricated by Zhang et al via 3D printing to render the surface superhydrophobic and the microstructures are shown in Figure 10A.…”

Section: Adding Materials Manufacturing Methodsmentioning

confidence: 99%

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

et al. 2021

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After a long period of biological evolution, natural creatures will inevitably evolve body surfaces suitable for the living environment. The functions of natural biological surfaces are abundant and powerful, including antiadhesion, self‐cleaning, drag reduction, anti‐icing, wear resistance, and other characteristics. In the context of coping with the energy crisis, inspired by natural biological surface microstructures, researchers explore biomimetic surface microstructures that reduce fluid drag and investigate the mechanisms of drag reduction. Herein, mainly the current state of research on biomimetic textured surfaces that can be applied to fluid drag reduction is reviewed and the microstructures’ morphology, drag reduction mechanisms, and the fabrication techniques of textured surfaces are discussed in detail. In particular, the experimental methods for measuring the drag reduction effect of textured surfaces are introduced, which is extremely rare. The article concludes with a summary of existing problems and future directions in the research of biomimetic surface drag reduction technology. This Review can provide a reference for practical application and laboratory research of drag reduction in marine transportation, military weapons, aviation, and pipeline systems.

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3D Bioinspired Microstructures for Switchable Repellency in both Air and Liquid

Cited by 21 publications

References 59 publications

Capillary‐Force‐Driven Self‐Assembly of 4D‐Printed Microstructures

Capillary‐Force‐Driven Self‐Assembly of 4D‐Printed Microstructures

Tethered and Untethered 3D Microactuators Fabricated by Two-Photon Polymerization: A Review

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

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