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.

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.

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.

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.

Silver Film Atomic Oxygen Sensors: Further Evidence for Utility as an Atmospheric Probe

1974 ◽  
Vol 52 (21) ◽  
pp. 2174-2175 ◽  
Author(s):  
W. R. Henderson
Keyword(s):  
Atomic Oxygen ◽  
Silver Film ◽  
Oxygen Sensors ◽  
Rate Of Change ◽  
Upper Atmosphere ◽  
Silver Films

Further evidence for the utility of thin silver films as detectors of atomic oxygen in the upper atmosphere is given. Measurements show that under prescribed conditions no correction for rate of oxidation or rate of change of oxidation is necessary.

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.

Modeling, Simulation and Control of Single Wafer Process in Cluster Tool Base on Ft-Ir In-Line Sensor

1995 ◽  
Vol 389 ◽  
Author(s):  
Shaohua Liu ◽  
Peter Solomon ◽  
R. Carpio ◽  
B. Fowler ◽  
D. Simmons ◽  
...  
Keyword(s):  
Thin Film ◽  
Semiconductor Industry ◽  
Current Approach ◽  
Infrared Reflectance ◽  
Film Properties ◽  
Reflectance Measurement ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
And Control ◽  
Cluster Tool

ABSTRACTThis paper outlines our current approach to utilize infrared reflectance spectroscopy for thin film measurement in the semiconductor industry. The multi-layer thickness and doping concentration of IC wafers can be determined by a single angle, unpolarized infrared reflectance measurement performed using Fourier transform infrared spectrometer. A computer algorithm, which matches theoretical to measured infrared reflectance spectra, was successfully employed to determine multiple thin film properties.

Porous Poly(1-naphthylamine) Synthesized by Interfacial Polymerization

2014 ◽  
Vol 809-810 ◽  
pp. 319-322
Author(s):  
Zhen Zhong Hou ◽  
Qing Hao Yang
Keyword(s):  
Interfacial Polymerization ◽  
Amorphous Polymer ◽  
Molar Ratio ◽  
Polymerization Temperature ◽  
Main Mode ◽  
Reaction Conditions ◽  
Ft Ir ◽  
Micro Morphology ◽  
Polymerization Method ◽  
Porous Poly

Porous poly (1-naphthylamine) were synthesized by interfacial polymerization method. The effects of several reaction conditions including oxidant/monomer molar ratio, polymerization temperature and reaction time on the polymerization yield have been investigated. The highest yield of poly (1-naphthylamine) was up to 73% at oxidant/monomer molar ratio of 3 and polymerization temperature of 25 °C for over 20h. Using FT-IR and XRD to analyze the structure of the obtained polymer, the results show that the main mode of connection for 1-naphthylamine units was linking N to para-C and it formed amorphous polymer with some ordered strutures. The micro-morphology of the polymer observed by SEM was found to have irregular porous structure with pore size less than 5μm, which may be related to the “self-emulsion effect” during polymerization.

Morphologies of Silver Films Fabricated by Thermal Decomposition of Silver Behenate

2006 ◽  
Vol 11-12 ◽  
pp. 481-484
Author(s):  
Xian Hao Liu ◽  
Shu Xia Lu ◽  
Wei Liang Cao ◽  
Jing Chang Zhang
Keyword(s):  
Thermal Decomposition ◽  
Thick Film ◽  
Silver Film ◽  
The Other ◽  
Silver Particles ◽  
High Concentration ◽  
Decomposition Products ◽  
Silver Films ◽  
Triangular Shape ◽  
Thermal Decomposition Products

Various morphologies of silver films fabricated by the thermal decomposition of silver behenate have been studied. The morphological structures of silver behenate films at different heating temperatures are characterized by using SEM, IR and XRD. It is found that, while heating the silver behenate films, the formed silver particles are stabilized by the other thermal decomposition products in the range of 193°C∼320°C. The influence of silver behenate concentration in organic solvent on the formation and packing density of as-fabricated silver films by thermal treatment on the silver behenate films at 500°C has been studied. The results show that the silver film fabricated by a millimolar solution of silver behenate possesses a silver monolayer; the silver thick film can be formed at high concentration, and interestingly, silver particles with regular triangular or truncated triangular shape in the silver thick film are also obtained.

scholarly journals A Fully Inkjet-Printed Strain Sensor Based on Carbon Nanotubes

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 792 ◽  
Author(s):  
Hsuan-Ling Kao ◽  
Cheng-Lin Cho ◽  
Li-Chun Chang ◽  
Chun-Bing Chen ◽  
Wen-Hung Chung ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Morphology ◽  
Silver Film ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Lower Sensitivity ◽  
High Reproducibility ◽  
Silver Films ◽  
Microcrack Detection

A fully inkjet-printed strain sensor based on carbon nanotubes (CNTs) was fabricated in this study for microstrain and microcrack detection. Carbon nanotubes and silver films were used as the sensing layer and conductive layer, respectively. Inkjet-printed CNTs easily undergo agglomeration due to van der Waals forces between CNTs, resulting in uneven films. The uniformity of CNT film affects the electrical and mechanical properties. Multi-pass printing and pattern rotation provided precise quantities of sensing materials, enabling the realization of uniform CNT films and stable resistance. Three strain sensors printed eight-layer CNT film by unidirectional printing, rotated by 180° and 90° were compared. The low density on one side of eight-layer CNT film by unidirectional printing results in more disconnection and poor connectivity with the silver film, thereby, significantly increasing the resistance. For 180° rotation eight-layer strain sensors, lower sensitivity and smaller measured range were found because strain was applied to the uneven CNT film resulting in non-uniform strain distribution. Lower resistance and better strain sensitivity was obtained for eight-layer strain sensor with 90° rotation because of uniform film. Given the uniform surface morphology and saturated sheet resistance of the 20-layer CNT film, the strain performance of the 20-layer CNT strain sensor was also examined. Excluding the permanent destruction of the first strain, 0.76% and 1.05% responses were obtained for the 8- and 20-layer strain sensors under strain between 0% and 3128 µε, respectively, which demonstrates the high reproducibility and recoverability of the sensor. The gauge factor (GF) of 20-layer strain sensor was found to be 2.77 under strain from 71 to 3128 µε, which is higher than eight-layer strain sensor (GF = 1.93) due to the uniform surface morphology and stable resistance. The strain sensors exhibited a highly linear and reversible behavior under strain of 71 to 3128 µε, so that the microstrain level could be clearly distinguished. The technology of the fully inkjet-printed CNT-based microstrain sensor provides high reproducibility, stability, and rapid hardness detection.

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