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.

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.

Effects of Nano Silver Film on the Hydrophobicity of Moth Wing

2015 ◽  
Vol 1095 ◽  
pp. 608-611
Author(s):  
Yan Fang ◽  
Gang Sun
Keyword(s):  
Silver Film ◽  
Tertiary Structure ◽  
Wing Surface ◽  
Optical Contact ◽  
Silver Films ◽  
Biological Coupling ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Micro Morphology ◽  
Hydrophobic Material

The microstructure, superhydrophobicity and chemical composition of the moth wing surface were investigated by a scanning electron microscope (SEM), an optical contact angle (CA) meter and a Fourier transform infrared spectrometer (FT-IR). nanosilver film was coated on the wing surface by vacuum evaporation. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surface, composed of naturally hydrophobic material, is of high hydrophobicity (CA 143~156°) and exhibits complicated hierarchical micro-morphology including primary structure, secondary structure and tertiary structure. The cooperation of hydrophobic material and rough micro-morphology leads to the high hydrophobicity of the wing surface. The wing surfaces coated with 50~1000 nm silver films are still hydrophobic (CA > 110°). The multiple-dimensional rough structure of the wing surface results in the transition of metal silver from hydrophilic to hydrophobic. The moth wing can serve as a bio-template for design and preparation of micro-controllable superhydrophobic surface.

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.

Hydro-Oleophobic Property of Butterfly Wing Surface and Biomimetic Fabrication of Hydrophobic Silver Film

2015 ◽  
Vol 727-728 ◽  
pp. 3-6 ◽  
Author(s):  
Gang Sun ◽  
Yan Fang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silver Film ◽  
Methanol Solution ◽  
Wing Surface ◽  
Butterfly Wing ◽  
Functional Surface ◽  
Sliding Angle ◽  
Atomic Force ◽  
Scanning Electron

The hydrophobicity and oleophobicity(methanol repellency) of butterfly wing surfaces were measured by a video-basedcontact angle (CA) meter. The multi-dimensional microstructure of the wingsurfaces was characterized by a scanning electron microscope (SEM) and an atomic force microscope (AFM). The wingsurface exhibits superhydrophobicity (water CA 150.4~159.2°) and low adhesion (water sliding angle 1~3°). Meanwhile, the wingsurface displays high repellency against methanol. The critical concentrationsfor wetting and spreading-wetting of methanol solution on the wing surface are60% and 80%, respectively. The butterfly wing surface is ofhydro-oleophobicity. The wing surface possessescomplicated hierarchicalmicrostructures. Using the butterfly wing as a bio-template, the hydrophobicsilver films were prepared. Water CA increases from metal silver’s intrinsicCA 63.0° maximally to 139.2° (Speyeria aglaja, 5 nm silver film). The microstructures on thewing surface result in the transition of metal silver from hydrophilic tohydrophobic. The butterfly wing can be used as a template for design of smartinterface and functional surface.

Preparation and Photocatalytic Properties of Rod-Shaped TiO2 Based on Salix Fiber

2014 ◽  
Vol 609-610 ◽  
pp. 250-254
Author(s):  
Ya Bin Li ◽  
Jin Tian Huang ◽  
Yan Fei Pan
Keyword(s):  
Photocatalytic Performance ◽  
Sol Gel ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Nanocomposite Structure ◽  
X Ray ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Degradation Of Methyl Orange ◽  
Scanning Electron

In the paper, the TiO2nanomaterials adopted the microcrystalline cellulose as the template by the template method and sol-gel method was prepared. Through the infrared spectrometer (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD), the surface morphology, composition and the type of the samples were characterized respectively. The influence of the macro morphology of TiO2photocatalytic performance to use the reaction of decolorization and degradation of methyl orange as model was analyzed. The results showed that TiO2which was produced by the template of sallix fiber was Rod-shaped and the average diameter size of nanocomposite structure was 20.592 nm, which can provide a new method of producing other morphology of TiO2.

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.

Bacterial Cellulose: The Nano-Scalar Cellulose Morphology for the Material of Transparent Regenerated Membrane

2012 ◽  
Vol 586 ◽  
pp. 30-38 ◽  
Author(s):  
Chu Chu Chen ◽  
Da Gang Li ◽  
Qiao Yun Deng ◽  
Yu Mei Wang ◽  
Dong Liang Lin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Property ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Chemical Composition ◽  
Bacterial Cellulose ◽  
Light Transmission ◽  
Homogeneous Surface ◽  
Ft Ir ◽  
Scanning Electron

This paper demonstrates the preparation of transparent regenerated membrane from bacterial cellulose (BC) sheets using the lithium chloride（LiCl）/dimethylacetamide (DMAc) as dissolved system. The structure of the membrane was investigated by the scanning electron microscopy (SEM). It showed very smooth, dense and homogeneous surface while the raw BC sheet was poriness. FT-IR spectroposcopic analysis of both bacterial cellulose and the transparent membrane revealed that chemical composition was not changed during the fabrication process but only the peak strength changed. Mechanical property tests presented that after regeneration process, the tensile strength of the regenerated membrane was well improved compared with the raw BC sheets. Its light transmission was also attaining 91.2% due to the nano-scale structure. From the above，these properties make the transparent regenerated BC membrane potentially applied in optical electronic and packaging fields as the commercially available material.

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.

The Modification of Polypropylene Hollow Fiber Membrane by Grafting with N,N’-Methylene-Bisac-Rylamide on the Surface

2013 ◽  
Vol 699 ◽  
pp. 783-788
Author(s):  
Yong Fu Huang ◽  
Zhen Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Fiber Surface ◽  
Copolymer Composition ◽  
Fiber Membrane ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Scanning Electron

The surface of polypropylene hollow fiber membrane was modified with N,N’-methylene-bisac-rylamide (MBA) by the UV-irradiation, with the benzophenone (BP) as the light initiator. Fourier transform infrared spectrometer (FT-IR) was utilized to characterize copolymer composition. Field emission scanning electron microscopy (FE-SEM) was utilized to observe the fiber surface and section. Results showed that MBA was grafted on the surface of membrane. The influence was researched by changing the concentration of BP, MBA and irradiated time. Results showed that the grafting rate grew rapidly and then declined as the increase the BP concentration. The grafting rate increased at first as the MBA concentration increased, but decreased after the maximum. The grafting rate firstly increased slowly and then increased sharply with the irradiated time extended.

scholarly journals Effect of Poly (Sodium 4-Styrene Sulfonate) on the Morphology of Hydroxyapatite Particles

2009 ◽  
Vol 2009 ◽  
pp. 1-3 ◽  
Author(s):  
Nesa Esmaeilian Tari ◽  
Mohammad Mahdi Kashani Motlagh
Keyword(s):  
Electron Microscopy ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Nano Structure ◽  
X Ray ◽  
Styrene Sulfonate ◽  
Atomic Force ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Scanning Electron

Nanorods hydroxyapatite, (HAP) is successfully prepared by water in oil microemulsion using, and (water phase), poly(sodium 4-styrene sulfonate) (PSSS) as template and cyclohexane as oil phase. The nano-structure of the product was studied by means of X-ray diffraction (XRD), Fourier transmission infrared spectrometer (FT-IR), scanning electron microscopy (SEM), and atomic force microscope (AFM). With this system, we could synthesize nano-particles of hydroxyapatite with high crystallinity and least agglomeration.

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