Colloidal diffusion over a quasicrystalline-patterned surface

AbstractA straightforward ambient temperature route to the fabrication of surface silver-metallized polyimide films is described. Silver(I) trifluoromethane sulfonate and a polyimide, derived from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and an equimolar amount of 4,4'-oxydianiline (ODA) and 3,5-diaminobenzoic acid (DABA), were dissolved together in dimethylacetamide. Silver(I)-doped films were prepared at thicknesses of 25-50 microns and depleted of solvent by evaporation. The silver(I)-containing films were then treated with aqueous reducing agents, which brought forth silvered films exhibiting conductivity on the order of bulk polycrystalline silver and good specular reflectivity.

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Large-Area High-Contrast Hydrophobic/Hydrophilic Patterned Surface for Robust Electrowetting Devices

ACS Applied Nano Materials ◽

10.1021/acsanm.8b02303 ◽

2019 ◽

Vol 2 (2) ◽

pp. 1018-1026 ◽

Cited By ~ 5

Author(s):

Hao Wu ◽

Lingling Shui ◽

Fahong Li ◽

Rob Hayes ◽

Alex Henzen ◽

...

Keyword(s):

High Contrast ◽

Large Area ◽

Patterned Surface

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Fabrication of Hierarchical Micro-Nano Structures and Structural Coloring Effect of Polymer Substrate

Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing ◽

10.1115/msec2014-3934 ◽

2014 ◽

Author(s):

Woong Ki Jang ◽

Yong Min Park ◽

Young Ho Seo ◽

Byeong Hee Kim

Keyword(s):

Optical Properties ◽

Visible Light ◽

Polymer Substrate ◽

Length Scale ◽

Blue Color ◽

Pmma Substrate ◽

Color Intensity ◽

Patterned Surface ◽

Nano Structures ◽

Quasiperiodic Structure

Recently, structural coloring using hierarchical micro-nano structures as a technical field to implement a color without using a chemical colourants and dye is being developed as an attentional technology. The principle of structural coloring is that by the diffraction or multi-interference of light from a material containing a periodic or quasiperiodic structure on the length scale of the wavelength of visible light. For these reason, our research have verified the structural coloring effect on the polymer substrate by fabricate a hierarchical micro-nano structures. Firstly, we have fabricate a nano and hierarchical micro-nano structured mold for verify the structural size effect. Through the replication of structures on the PMMA substrate, we have measured optical properties in the range of visible light. As a results, the surface of nano structured PMMA showed a blue color according to induced the light. Furthermore, color intensity was increased according to increase the aspect ratio and diameter. In contrast, hierarchical micro-nano patterned surface showed iridescent colors.

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Numerical investigation of squeeze film lubrication on bioinspired hexagonal patterned surface

Industrial Lubrication and Tribology ◽

10.1108/ilt-07-2021-0247 ◽

2022 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Binbin Su ◽

Xianghe Zou ◽

Lirong Huang

Keyword(s):

Flow Rate ◽

Carrying Capacity ◽

Squeeze Film ◽

Load Carrying Capacity ◽

Two Dimensional ◽

Working Mechanism ◽

Content Type ◽

Patterned Surface ◽

Load Carrying ◽

Film Lubrication

Purpose This paper aims to investigate the squeeze film lubrication properties of hexagonal patterned surface inspired by the epidermis structure of tree frog’s toe pad and numerically explore the working mechanism of hexagonal micropillar during the acquisition process of high adhesive and friction for wet contacts. Design/methodology/approach A two-dimensional elastohydrodynamic numerical model is employed for the squeezing contacts. The pressure distribution, load carrying capacity and liquid flow rate of the squeeze film are obtained through a simultaneous solution of the two-dimensional Reynolds equation and elasticity deformation equations. Findings Higher pressure is found to be longitudinally distributed across individual hexagonal pillar, with pressure peak emerging at the center of hexagonal pillar. Expanding the area density and shrinking the channel depth or initial film thickness will improve the magnitude of squeezing pressure. Relatively lower pressure is generated inside interconnected channels, which reduces the load carrying capacity of the squeeze film. Meanwhile, the introduction of microchannel is revealed to downscale the total mass flow rate of squeezing contacts. Originality/value This paper provides a good proof for the working mechanism of surface microstructures during the acquisition process of high adhesive and friction for wet contacts.

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Multiscale Simulation for Exploring Photo-Chemical Processes to Mitigate the Critical Dimension Variability of Contact Hole in EUV Lithography

Journal of Materials Chemistry C ◽

10.1039/d1tc00891a ◽

2021 ◽

Author(s):

Sungwoo Park ◽

Hyungwoo Lee ◽

Muyoung Kim ◽

Taegyeom Kim ◽

Byunghoon Lee ◽

...

Keyword(s):

Surface Roughness ◽

Extreme Ultraviolet ◽

Critical Dimension ◽

Multiscale Simulation ◽

Chemical Processes ◽

Production Yield ◽

Extreme Ultraviolet Lithography ◽

Ultraviolet Lithography ◽

Patterned Surface ◽

Euv Lithography

In extreme ultraviolet lithography (EUVL), non-uniformity of patterned surface roughness of contact holes results in pattern failures such as bridging- or missing holes, which affect production yield. In this study,...

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Three-Dimensional Compatible Sacrificial Nanoimprint Lithography for Tuning the Wettability of Thermoplastic Materials

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4041532 ◽

2018 ◽

Vol 6 (4) ◽

Cited By ~ 1

Author(s):

Molla Hasan ◽

Imrhankhan Shajahan ◽

Manesh Gopinadhan ◽

Jittisa Ketkaew ◽

Aaron Anesgart ◽

...

Keyword(s):

Nanoimprint Lithography ◽

Characteristic Length ◽

Three Dimensional ◽

Thermoplastic Elastomer ◽

Growth Conditions ◽

Surface Wetting ◽

Chemical Surface ◽

Patterned Surface ◽

Elastomeric Material ◽

Hydrophilicity And Hydrophobicity

We report the tuning of surface wetting through sacrificial nanoimprint lithography (SNIL). In this process, grown ZnO nanomaterials are transferred by imprint into a metallic glass (MG) and an elastomeric material, and then etched to impart controlled surface roughness. This process increases the hydrophilicity and hydrophobicity of both surfaces, the Pt57.5Cu14.7Ni5.3P22.5 MG and thermoplastic elastomer (TPE), respectively. The growth conditions of the ZnO change the characteristic length scale of the roughness, which in turn alters the properties of the patterned surface. The novelty of this approach includes reusability of templates and that it is able to create superhydrophilic and superhydrophobic surfaces in a manner compatible with the fabrication of macroscopic three-dimensional (3D) parts. Because the wettability is achieved by only modifying topography, without using any chemical surface modifiers, the prepared surfaces are relatively more durable.

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