Self-Cleaning Characteristic of the Insect (Lepidoptera) Wing Surfaces

2015 ◽  
Vol 1089 ◽  
pp. 198-201
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Coupling Effect ◽  
Removal Rate ◽  
Wing Surface ◽  
Particle Removal ◽  
Structural Element ◽  
Sliding Angle ◽  
Cleaning Performance ◽  
Material Element ◽  
Infrared Spectrometer ◽  
Self Cleaning

The microstructure, hydrophobicity, adhesion and chemical composition of the butterfly and the moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle (CA) meter, and a Fourier transform infrared spectrometer (FT-IR). Using ground calcium carbonate (heavy CaCO3) as contaminating particle, the self-cleaning performance of the wing surface was evaluated. The wing surfaces, composed of naturally hydrophobic material (chitin, protein, fat, etc.), possess complicated hierarchical micro/nanostructures. According to the large CA (149.5~156.9° for butterfly, 150.5~155.6° for moth) and small sliding angle (SA, 1~3°), the wing surface is of low adhesion and superhydrophobicity. The removal rate of contaminating particle from the wing surface is averagely 88.3% (butterfly wing) and 88.0% (moth wing). There is a good positive correlation (R2=0.8152 for butterfly, 0.8436 for moth) between particle removal rate and roughness index of the wing surface. The coupling effect of material element and structural element contributes to the outstanding superhydrophobicity and self-cleaning performance of the wing surface. The wings of Lepidoptera insect can be potentially used as templates for biomimetic preparation of intelligent interfacial material with multi-functions.

Low Adhesive Superhydrophobicity and Self-Cleaning Property of Moth Wing

2015 ◽  
Vol 1089 ◽  
pp. 194-197
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Coupling Effect ◽  
Removal Rate ◽  
The Self ◽  
Wing Surface ◽  
Particle Removal ◽  
Structural Element ◽  
Sliding Angle ◽  
Material Element ◽  
Infrared Spectrometer ◽  
Self Cleaning

The microstructure, hydrophobicity, adhesion, and chemical composition of moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle (CA) meter, and a Fourier transform infrared spectrometer (FT-IR). Using ground calcium carbonate (heavy CaCO3) as contaminating particle, the self-cleaning performance of wing surface was evaluated. The self-cleaning mechanism was discussed from the perspective of biological coupling. The wing surfaces, composed of naturally hydrophobic material (chitin, protein, fat, etc.), possess complicated hierarchical micro/nano structures. According to the large CA (138.9~158.4°) and small sliding angle (SA, 1~3°) of water droplet, moth wing surface is of low adhesion and high hydrophobicity. The removal rate of contaminating particle from wing surface is averagely 83.8%. There is a good positive correlation (r=0.81) between particle removal rate and roughness index of wing surface. The coupling effect of material element and structural element leads to the remarkable hydrophobicity and self-cleaning property of the wing surface. Moth wing can be potentially used as a template for biomimetic design of functional material with complex wettability. This work may offer interesting inspirations for preparation of smart interfacial material.

A Comparison of the Complex Wettability between Locust and Moth Wing

2015 ◽  
Vol 1095 ◽  
pp. 593-597
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Contact Angle ◽  
Wing Surface ◽  
Baxter Equation ◽  
Structural Element ◽  
Sliding Angle ◽  
High Adhesion ◽  
Material Element ◽  
Infrared Spectrometer ◽  
Transport Channels ◽  
Functional Interface

The microstructure, hydrophobicity and chemical composition of the locust and moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle meter and a Fourier transform infrared spectrometer (FT-IR). The hydrophobicity models were established on the basis of the Cassie-Baxter equation. The locust and moth wing surfaces are composed of naturally hydrophobic materials, but exhibit different complex wettability. The locust wing surface is of extremely high adhesion (sliding angle>180°) and superhydrophobicity (contact angle 151.5~157.3°), while the moth wing surface is of low adhesion (sliding angle 1~3°) and superhydrophobicity (contact angle 150.5~155.6°). The complex wettability of the wing surfaces ascribes to the cooperative effect of material element and structural element. The locust and moth wings can be potentially used as biomimetic templates for design and preparation of novel functional interface and no-loss microfluidic transport channels.

Complex Wettability and Self-Cleaning Performance of Butterfly Wing Surface

2015 ◽  
Vol 723 ◽  
pp. 943-947 ◽  
Author(s):  
Yan Fang ◽  
Gang Sun
Keyword(s):  
Removal Rate ◽  
Average Rate ◽  
Contact Angles ◽  
Wing Surface ◽  
Butterfly Wing ◽  
Cleaning Performance ◽  
Infrared Spectrometer ◽  
Self Cleaning ◽  
Pollution Removal ◽  
Special Complex

The microstructure, hydrophobicity and chemical composition of butterfly wing surfaces were investigated by a scanning electron microscope (SEM), a video-based contact angle meter, and a Fourier transform infrared spectrometer (FT-IR). Using CaCO3 particle as simulated pollutant, the self-cleaning performance of the wing surface was measured. The wing surfaces possess complicated micro/nanostructures. According to the large contact angles (140.2~156.9°) and small sliding angles (1~3°) of water droplet, the butterfly wing surface is of high hydrophobicity and low adhesion. The average rate of CaCO3 pollution removal from the wing surface is as high as 86.2%. There is a good positive correlation (r=0.89) between pollution removal rate and roughness index of the wing surface. The coupling effects of hydrophobic material and rough microstructure contribute to the special complex wettability and remarkable self-cleaning property of the wing surface. Butterfly wing can be used as a template for design of superhydrophobic surface and self-cleaning material. This work may offer inspirations for biomimetic fabrication of novel interfacial material with multi-functions.

High Adhesive Superhydrophobicity and Wetting Mechanism of Locust Wing Surface

2015 ◽  
Vol 1089 ◽  
pp. 190-193
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Tertiary Structure ◽  
Coupling Effect ◽  
Wing Surface ◽  
Microfluidic Channels ◽  
Functional Surface ◽  
Structural Element ◽  
Wing Vein ◽  
Material Element ◽  
Infrared Spectrometer ◽  
Locust Wing

The complex wettability, chemical composition and microstructure of locust wing surface were investigated by a video-based contact angle (CA) meter, a Fourier transform infrared spectrometer (FT-IR) and a scanning electron microscope (SEM). A model for hydrophobicity of wing surface was established on the basis of Cassie equation. The wetting mechanism was discussed from the perspective of biological coupling. The wing surface is a waxy layer composed mainly of long chain hydrocarbon, tallate and fatty-acid alcohol, possesses multiple-dimensional rough microstructures including primary structure (wing vein grids), secondary structure (regularly arraying micrometric pillar gibbosities), and tertiary structure (nanocorrugations). The diameter, height, and spacing of pillar gibbosity are 3.0~10.2 μm, 3.4~9.2 μm, and 7.5~18.5 μm, respectively. Locust wing surface is of high adhesive superhydrophobicity (CA 150.1~157.3°). The complex wettability of the wing surface ascribes to coupling effect of material element (waxy crystal) and structural element (hierarchical rough microstructure). Locust wing can be potentially used as a biomimetic template for design of special functional surface. This work may bring insights for preparation of micro-controllable superhydrophobic surface and no-loss microfluidic channels.

A Comparative Study on the Wettability between Butterfly and Locust Wing Surface

2015 ◽  
Vol 1089 ◽  
pp. 181-184
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Contact Angle ◽  
Coupling Effect ◽  
Wing Surface ◽  
Functional Surface ◽  
Sliding Angle ◽  
High Adhesion ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Transport Channels ◽  
Locust Wing

The microstructure, hydrophobicity and chemical composition of the butterfly and locust wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle meter and a Fourier transform infrared spectrometer (FT-IR). The hydrophobicity models were established on the basis of the Cassie equation. The wetting mechanism was comparatively discussed from the perspective of biological coupling. The butterfly and the locust wing surfaces are composed of naturally hydrophobic materials, but exhibit different complex wettability. The butterfly wing surface is of low adhesion (sliding angle 1~3°) and superhydrophobicity (contact angle 151.6~156.9°), while the locust wing surface is of extremely high adhesion (sliding angle>180°) and superhydrophobicity (contact angle 155.8~157.3°). The complex wettability of the wing surfaces ascribes to the coupling effect of hydrophobic material and rough structure. The butterfly and locust wings can be used as bio-templates for design and preparation of biomimetic functional surface, intelligent interfacial material and no-loss microfluidic transport channels.

The Relationship between Superhydrophobicity, Self-Cleaning Performance and Microstructure of Butterfly Wing

2015 ◽  
Vol 727-728 ◽  
pp. 273-276
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Removal Rate ◽  
Wing Surface ◽  
Butterfly Wing ◽  
Cleaning Performance ◽  
Roughness Index ◽  
Interfacial Material ◽  
Self Cleaning ◽  
Pollution Removal ◽  
The Relationship ◽  
Hydrophobic Material

The microstructure and hydrophobicity of butterflywing surfaces were investigated by a scanning electron microscope (SEM), an atomicforce microscope (AFM) and a contact angle meter. The relationship between hydrophobicity,self-cleaning performance and microstructuralcharacteristic was analyzed. The butterfly wing surface is of lowadhesion (water SA 1~3°) and high hydrophobicity (water CA 138~157°). Theaverage rate of CaCO3 pollutionremoval from the wing surface is as high as 86.2%. There is a good positive correlation (R2=0.873)between pollution removal rate and roughness index of the wing surface. The coupling effects of hydrophobic material andrough microstructure contribute to the complex wettability and remarkableself-cleaning property of the wing surface. Butterfly wing can be potentiallyused as a template for design of micro-controllable superhydrophobic surfaceand nano self-cleaning material. This work may offer inspirations forbiomimetic fabrication of novel interfacial material with multi-functions.

Water/Methanol-Repellency and Wetting Mechanism of Moth Wing Surface

2015 ◽  
Vol 723 ◽  
pp. 948-951
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Chemical Composition ◽  
Coupling Effect ◽  
Methanol Solution ◽  
Wing Surface ◽  
Functional Surface ◽  
Bionic Design ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Hydrophobic Material

The water-and methanol-repellent properties of moth wing surfaces were determined by a contact angle (CA) meter, the chemical composition and microstructures of moth wing surfaces were investigated by a Fourier transform infrared spectrometer (FT-IR) and a scanning electron microscope (SEM). The wing surface is composed of naturally hydrophobic material and possesses hierarchical rough structures. The wing surface exhibits high repellency against water (CA 139.2~155.6°) and methanol solution. The critical concentrations for wetting and spreading-wetting of methanol solution on the wing surfaces are 60% and 80%, respectively. The complex wettability of the wing surface ascribes to the coupling effect of chemical composition and micro/nanostructure. Moth wing can be used as a template for bionic design of special functional surface.

Developments for Physical Cleaning Sample with High Adhesion Force Particles and Direct Measurement of its Removal Force

2016 ◽  
Vol 255 ◽  
pp. 201-206 ◽  
Author(s):  
Emu Tokuda ◽  
Toshiyuki Sanada ◽  
Futoshi Iwata ◽  
Chikako Takato ◽  
Hirokuni Hiyama ◽  
...  
Keyword(s):  
Particle Size ◽  
Direct Measurement ◽  
Adhesion Force ◽  
Removal Rate ◽  
Particle Removal ◽  
Cleaning Performance ◽  
High Adhesion ◽  
Particle Adhesion Force ◽  
Particle Sample ◽  
Measured Particle

We quantitatively evaluate the wet cleaning performance of particle cotamination. We made particle sample which endure the wet cleaning and measured particle adhesion force by self-sensitive cantilever. The advantage of this method is that performed in both air and water. As a result, there were no significant differences between the air and water condition and the influence of particle size were dominant. Using this sample, we demonstrated particle removal rate of droplets impacts and PVA brush.

The Role of Hierarchical Micro-Morphology in the Wetting Property of Moth (Geometrinae) Wing Surface

2015 ◽  
Vol 1095 ◽  
pp. 651-654
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Removal Rate ◽  
Average Rate ◽  
Wing Surface ◽  
Sliding Angle ◽  
Biological Coupling ◽  
Roughness Index ◽  
Wetting Property ◽  
Pollution Removal ◽  
Micro Morphology

The micro-morphology of the moth wing surface was characterized by a scanning electron microscope (SEM). The contact angle (CA) and sliding angle (SA) of water droplet on the wing surface were measured by an optical CA meter. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surface is of superhydrophobicity (CA 143~156°) and low adhesion (SA 1~4°), and displays multiple-dimensional rough micro-morphology. The scales play a crucial role in the complex wettability of the wing. The average rate of CaCO3 pollution removal from the wing surface is as high as 87.3%. There is a positive correlation (R=0.8777) between pollution removal rate and roughness index of the wing. The cooperation of chemical composition and micro-morphology contributes to the special wettability and outstanding self-cleaning performance of the wing. The moth wing can serve as a template for biomimetic design and preparation of novel interfacial material with multi-functions.

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