Robust and Elevated Adhesion and Anisotropic Friction in a Bioinspired Bridged Micropillar Array

Shi, Zhekun; Zhu, Bo; Wang, Zhuo; Xiao, Kangjian; Wang, Yan; Xue, Longjian

doi:10.1021/acs.langmuir.3c00033

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…Unlike chemical adhesives, [ 5–9 ] the adhesions of these animals are reversible and determined by the pillar‐like structures on their feet. Inspired by these animals, structured micro‐ & nano‐pillar adhesives have been widely explored to achieve strong, [ 10 ] reversible, [ 11 ] and anisotropic [ 12 ] adhesions. When the structured surface has a low elastic modulus, either using a soft material or a pillar with a larger aspect ratio, good contact with the counterpart surface can be expected.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike chemical adhesives, [5][6][7][8][9] the adhesions of these animals are reversible and determined by the pillar-like structures on their feet. Inspired by these animals, structured micro-& nanopillar adhesives have been widely explored to achieve strong, [10] reversible, [11] and anisotropic [12] adhesions. When the structured Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Micropillar with Radial Gradient Modulus Enables Robust Adhesion and Friction

Zhu,

Tan,

Xiao

et al. 2024

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The gradient modulus in beetle setae plays a critical role in allowing it to stand and walk on natural surfaces. Mimicking beetle setae to create a modulus gradient in microscale, especially in the direction of setae radius, can achieve reliable contact and thus strong adhesion. However, it remains highly challenging to achieve modulus gradient along radial directions in setae‐like structures. Here, polydimethylsiloxane (PDMS) micropillar with radial gradient modulus, (termed GM), is successfully constructed by making use of the polymerization inhibitor in the photosensitive resin template. GM gains adhesion up to 84 kPa, which is 2.3 and 4.7 times of soft homogeneous micropillars (SH) and hard homogeneous micropillars (HH), respectively. The radial gradient modulus facilitates contact formation on various surfaces and shifts stress concentration from contact perimeter to the center, resulting in adhesion enhancement. Meanwhile, GM achieves strong friction of 8.1 mN, which is 1.2 and 2.6 times of SH and HH, respectively. Moreover, GM possesses high robustness, maintaining strong adhesion and friction after 400 cycles of tests. The work here not only provides a robust structure for strong adhesion and friction, but also establishes a strategy to create modulus gradient at micron‐scale.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micropillar with Radial Gradient Modulus Enables Robust Adhesion and Friction

Zhu,

Tan,

Xiao

et al. 2024

Small

Self Cite

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“…Micro- and nanostructured adhesives have been studied extensively since the discovery of the excellent adhesion and locomotion of animals such as geckos, tree frogs, and beetles. − The adhesives composed of an array of micro/nanopillars have been constructed for diverse applications, including medical treatment, robotics, transfer printing, and many others. − The adhesion principle (also known as “contact splitting”) of the pillars array is to split the contact surface into multiple contact elements, where the adhesion derived from van der Waals force between the pillars and the substrate far beyond the continuous contact surface. , …”

Section: Introductionmentioning

confidence: 99%

Bioinspired Core–Shell Micropillar Array for Robust and Enhanced Adhesion and Friction

Zhang,

Li,

Yang

et al. 2023

ACS Appl. Nano Mater.

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Bioinspired structured adhesives exhibit promising applications in the fields of treatment, robotics, precision manufacturing, etc. The robust and strong adhesion and friction of the adhesive are highly required due to the easily damaged submicron structures. Here, we develop a simple method to prepare micropillar arrays with core–shell structure (P CS), which realizes a 2.03-fold adhesion and a 1.78-fold friction as compared to the pure PDMS micropillars array (P P). Moreover, the adhesion of P CS shows excellent durability over 100 repeating cycles of attachment/detachment. The enhancement can be attributed to the transfer of the maximum stress from the edge of the contact interface to the central region due to the existence of the core–shell structure. The study presents a novel approach for designing robust structured adhesives with strong adhesion and friction, which can be extended to other material combinations.

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Anisotropic Stick–Slip Frictional Surfaces via Titania Nanorod Patterning

Datta,

Gnecco,

Gosvami

et al. 2024

ACS Appl. Mater. Interfaces

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Nanoscale or microscale surface texturing is an effective technique to tailor the tribological properties between two surfaces that are rubbed against each other. In order to achieve the desired frictional properties by a patterned surface, one needs an in-depth understanding of the underlying mechanisms. Here, we demonstrate anisotropic stick–slip friction achieved via a nanotextured surface of tilted titania nanorods (TiNRs). The surface was developed by using the glancing angle deposition (GLAD) technique, and exhibited load-dependent variations in stick–slip friction as well as frictional anisotropy in different sliding directions. For studying the frictional properties of the newly developed surface, lateral force microscopy (LFM) was performed in three different reciprocal orientations (0° rotated, 45° rotated, 90° rotated) using a custom-made colloidal alumina atomic force microscopy (AFM) probe. The frictional behavior was found to vary significantly with the orientation. At 0° rotated position) a prominent “stick–slip” was observed when scanning opposite to the tilt direction, whereas the phenomenon reduced significantly when the nanotextured surface was scanned along the tilt direction or rotated to different angles (45 and 90°) with respect to the sliding direction of the AFM cantilever supporting the probe. The experimental findings were interpreted based on the classical solution for large deflections of tilted elastic rods. Overall, the textured surface, LFM-based frictional measurement, and the quantitative analysis presented here provide a fundamental understanding of how friction can be significantly varied on a surface patterned with tilted TiNRs at a length scale of about 1 μm, which can be comprehensively applied to nanorod patterns of other materials on different substrates.

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Robust and Elevated Adhesion and Anisotropic Friction in a Bioinspired Bridged Micropillar Array

Cited by 3 publications

References 51 publications

Micropillar with Radial Gradient Modulus Enables Robust Adhesion and Friction

Micropillar with Radial Gradient Modulus Enables Robust Adhesion and Friction

Bioinspired Core–Shell Micropillar Array for Robust and Enhanced Adhesion and Friction

Anisotropic Stick–Slip Frictional Surfaces via Titania Nanorod Patterning

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