Study of dynamic hydrophobicity of micro-structured hydrophobic surfaces and lotus leaves

Hao, Pengfei; Yao, Zhaohui; Zhang, Xiwen

doi:10.1007/s11433-011-4269-1

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…Some experiments were carried out on water droplets on silicon wafers with microscale regular pillars structures and fresh lotus leaves, which indicate that the multi-scale micro/ nano-structures on a lotus leaf surface are advantageous in forming a stable gas-liquid interface, thus effectively reducing resistance to fluid flow. These encouraging experimental results can direct us to research on the multi-scale numerical model for practical applications [5].…”

Section: Simulation At Nano-scalementioning

confidence: 82%

Recent research progress in computational solid mechanics

Zhuang

Maitireyimu

2012

Chin. Sci. Bull.

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Computational mechanics has had a profound impact on science and technology over the past five decades. It has numerically transformed much of the classical theory models into practical tools for predicting and understanding the complex engineering and science system. A short review is given in this paper on some recent progress in computational solid mechanics at multi-scales.computational solid mechanics, extended finite element method, molecule dynamic, multi-scales Citation:Zhuang Z, Maitireyium M. Recent research progress in computational solid mechanics. Chin Sci Bull, 2012Bull, , 57: 46834688, doi: 10.1007 Computational mechanics has had a profound impact on science and technology over the past five decades. It has numerically transformed much of the classical Newtonian theory into practical tools for predicting and understanding the complex engineering and science system, which have some limitations using the classic analytical solutions. Finite element methodology (FEM), which is one of the most powerful computation tools, has been widely used in the simulation-based engineering and science. There are a number of methods based on FEM dealing with the problem of material behaviors and structural mechanics, for example, damage and fracture. Since the limitation of FEM is in the continuum problem ranging from micro-meter to macro scales, the molecule dynamic (MD) computation is used at nano-scale research. A short review is given in this paper on the recent progress in computational solid mechanics related to length scales. MD simulation at nano-scaleThe carbon nano-tube (CNT) as a representative nano-scale material was invented twenty years ago. Its material behavior and mechanics has been interested by many researchers and engineers. The investigations were carried out from the aspects of theory, experiment and simulation. Since it is discrete at atomic length, the MD method is the best tool in the numerical analysis. Another purpose using MD simulation is to provide the failure criterion for dislocation initiation in the crystals, which can link the scales from nano-meter to micron. The minimum energy principle for the dislocation nucleation or initiation was predicted for inhomogeneous atomic system [1]. The simulation results illustrated that the thin film is easily nucleated on the surface because the atomic bonds lose. Based on MD simulation at nano-size and theoretical analysis, an investigation of the combined size and rate effects on the mechanical responses of faced cubic crystal (FCC) metals has been made to develop a hyper-surface (Figure 1) crossing the length scales [2]. The high strength and hard toughness properties of crystalline solid were intensively investigated at sub-micron and nanoscales. In these scales, the forms of defects in a crystal material are dislocation and grain boundary. A majority of research papers were focused on the dislocation nucleation and the interactions between dislocation and grain boundary [3]. The yield strength of perfect crystal depends on dislocation nu...

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Section: Simulation At Nano-scalementioning

confidence: 82%

Recent research progress in computational solid mechanics

Zhuang

Maitireyimu

2012

Chin. Sci. Bull.

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“…The water droplets roll down and gather debris as they fall off the leaf with the assistance of the nanoscale wax crystals. The scientific writers produced the illustration based on "Poole's idea illustration" [25]. Currently most of the researches on superhydrophobic materials are focused on the preparation technology.…”

Section: Micro and Nano Patterned Polymer Surfaces Fabrication Techni...mentioning

confidence: 99%

A Review on Fabrication Types of Micro/Nano Hierarchical Structures and Their Applications in Aerospace Engineering

Gebrehiwet,

Tadesse,

Negussie

2024

IJTRET

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This review paper discusses various nano/microstructures and fabrication techniques. The nano/ microstructure materials like nano/micropatterned polymer and hierarchical structured surfaces employ different fabrication processes which is the main purpose of this review paper to identify the best technique for Aerospace applications.. The common nano/micro patterned polymer surfaces fabrication technique is by using soft lithography. Hierarchical structured surfaces fabrication techniques are by using soft lithography, self-assembly and by drag reduction from shark skin. They have a special and excellent surface functions namely hydrophobicity, structure color, drag reduction, anti-adhesion, color camouflages and other features. Super hydrophobic surfaces are used for various applications, such as solar panels, cutlery, roof tiles, fabrics, self-cleaning windows, windshields, buildings paints, external paints for ships and others. The main applications in aerospace are the airfoil design, self-cleaning window glasses or paints and anti-corrosion metal surfaces. The methods employed to arrive on our specific applications are description on nano/micro hierarchical structures, useful natural replicas for these strictures, identifying their surface functions and unique benefits as well as the recommended fabrication processes and applications. The best application we found is the riblet fabrication used in airplanes and airfoils geometries. These hierarchical structured surfaces are fabricated by drag reduction from shark skin.

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“…To make these surfaces, we used photolithography and reactive ion etching [24] to create a regular array of square microstructures (a = 4 m) on the surface of a silicon wafer; this array of pillars enhances the roughness and produces a superhydrophobic surface. Four different samples were prepared of area fractions f s = 0.04, 0.0625, 0.1111 and 0.16, where f s is defined as f s = a 2 /(a+s) 2 and s is the spacing between the pillars.…”

Section: Droplet Impact Dynamicsmentioning

confidence: 99%