Re‐Entrant Microstructures for Robust Liquid Repellent Surfaces (Adv. Mater. Technol. 5/2023)

Vu, Hoang Huy; Nguyen, Nam‐Trung; Kashaninejad, Navid

doi:10.1002/admt.202370023

Cited by 4 publications

(3 citation statements)

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“…Those liquids include low surface tension fluids such as hydrocarbons and organic solvents, or complex fluids such as blood, nanofluids, and emulsions. Researchers have reported omniphobic surfaces based on reentrant structures [78,145] and LIS [146] that exhibit low contact angle hysteresis for such low surface tension or complex fluids. However, the progress in creating surfaces that enable directional wetting of these fluids has been somewhat restricted due to the complexities in fabricating and designing suitable surface structures that can accommodate both directional wetting and omniphobicity.…”

Section: Perspectives and Discussionmentioning

confidence: 99%

Advances in Directional Wetting Surfaces for Enhanced Fluid Control: A Comprehensive Review

Li,

Kim,

Yoon

et al. 2023

Adv Funct Materials

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Controlling surface wettability and directing the flow of working fluids have crucial implications in various natural and engineering contexts. Understanding the fundamental principles of wettability and directional wetting is essential for effectively leveraging these phenomena to enhance the performance of engineering systems, such as microfluidics or heat exchangers. This comprehensive review summarizes of previous research, emphasizing recent advances by categorizing the structures and working principles associated with directional wetting surfaces. The efforts of researchers who have employed diverse strategies to manipulate the wetting behavior of liquids through both passive and active control mechanisms are highlighted. Passive directional transport surfaces require no additional energy while enabling large‐scale and continuous fluid control. Conversely, active directional wetting surfaces offer enhanced flexibility and precise control of liquid movement. Furthermore, insights into recent studies that focused on practical applications are provided and the current challenges that need to be addressed are discussed. This study serves as a guide for future research directions on the development of directional wetting surfaces and offers valuable recommendations for practical implementation.

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Section: Perspectives and Discussionmentioning

confidence: 99%

Advances in Directional Wetting Surfaces for Enhanced Fluid Control: A Comprehensive Review

Li,

Kim,

Yoon

et al. 2023

Adv Funct Materials

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“…[ 2 ] The design of microstructured surfaces with specific wetting properties depends on the shape and size of the microstructures. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

“…[2] The design of microstructured surfaces with specific wetting properties depends on the shape and size of the microstructures. [3] The wettability of micropatterned surface can also be adjusted by employing diverse pillar shapes. If pillars are organized in a square array, the wetting characteristics exhibit uniformity across all directions on these surfaces.…”

mentioning

confidence: 99%

Tunable Wettability with Stretchable Microstructured Surfaces

Vu,

Nguyen,

Nguyen

et al. 2023

Adv Eng Mater

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Analyzing the wettability of stretchable microstructured surfaces is crucial in applications like soft robotics, wearable biosensors, stretchable electronics, and electronic skin (e‐skin). However, it remains unclear how stretching affects the surface free energy (SFE) of these stretchable surfaces. In this article, stretchable microstructured surfaces are designed and fabricated, enabling liquid droplets to stay on top of the surface gaps. The corresponding SFE values are quantified as a function of both micropillar geometry and strain. It is observed that stretching could significantly affect their SFE and wettability. For instance, for the microstructured surface with pillar and gap dimensions of 10 μm, increasing the strain from 0% to 50% causes a sevenfold increase in the effective SFE. Interestingly, reversible decreasing of the strain decreases SFE to its original value, suggesting that the SFE remains unchanged after a complete stretching and releasing cycle. This trend agrees with the measurement of apparent contact angle (CA) as a function of strain. The results demonstrate stretching's capacity to significantly increase the wettability of microstructured surfaces, leading to a decrease in the CA and an increase in SFE. These findings further shed light on understanding the tunable wettability of microstructured surfaces under various deformation conditions.

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Exploring Wettability of Re‐Entrant Microstructures: Effects of Geometry and Material Composition

Vu,

Nguyen,

Singha

et al. 2024

Adv Materials Inter

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This study systematically explores the wetting characteristics of re‐entrant microstructures, focusing on the interplay between the unique geometries and material compositions. While silicon dioxide (SiO₂) re‐entrant microstructures are previously studied, this research pioneers the fabrication of silicon carbide (SiC) re‐entrant microstructures. Through experimental approaches and theoretical analysis, the research assesses how variations in geometry and material impact wettability. Key findings reveal that SiC re‐entrant structures achieve an average contact angle of 145°, closely matching the 148° observed for SiO₂, indicating similar hydrophobic behavior. Although flat SiC surfaces exhibit higher inherent hydrophobicity than flat SiO₂ (59° vs 26° contact angle), re‐entrant geometry predominantly influences wetting behavior, overshadowing material differences. Structures with lower solid area fractions show increased hydrophobicity, with a distinct hierarchy: microlines are the least hydrophobic, followed by shark‐skin textures, rectangles, circles, and triangles. Additionally, increasing the gap size between structures enhanced hydrophobicity up to a critical point. This study paves the way for optimizing re‐entrant microstructures for specific applications, significantly enhancing the understanding of surface science and advancing material design.

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Re‐Entrant Microstructures for Robust Liquid Repellent Surfaces (Adv. Mater. Technol. 5/2023)

Cited by 4 publications

References 0 publications

Advances in Directional Wetting Surfaces for Enhanced Fluid Control: A Comprehensive Review

Advances in Directional Wetting Surfaces for Enhanced Fluid Control: A Comprehensive Review

Tunable Wettability with Stretchable Microstructured Surfaces

Exploring Wettability of Re‐Entrant Microstructures: Effects of Geometry and Material Composition

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