Multi-height structures in injection molded polymer

Nis Korsgaard Andersen, Rafael J. Taboryski

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    Abstract

    We present the fabrication process for injection molded multi-height surface structures for studies of wetting behavior. We adapt the design of super hydrophobic structures to the fabrication constrictions imposed by industrial injection molding. This is important since many super hydrophobic surfaces are challenging to realize by injection molding due to overhanging structures and very high aspect ratios. In the fabrication process, we introduce several unconventional steps for producing the desired shapes, using a completely random mask pattern, exploiting the diffusion limited growth rates of different geometries, and electroforming a nickel mold from a polymer foil. The injection-molded samples are characterized by contact angle hysteresis obtained by the tilting method. We find that the receding contact angle depends on the surface coverage of the random surface structure, while the advancing contact angle is practically independent of the structure. Moreover, we argue that the increase in contact angle hysteresis correlates with the concentration of pinning sites among the random surface structures.
    Original languageEnglish
    JournalMicroelectronic Engineering
    Volume141
    Pages (from-to)211-214
    Number of pages4
    ISSN0167-9317
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Contact angle
    • Keywords Super hydrophobic surface
    • Microlithography
    • Self-cleaning
    • Aspect ratio
    • Fabrication
    • Hydrophobicity
    • Hysteresis
    • Lithography
    • Masks
    • Molding
    • Surface chemistry
    • Surface structure
    • Advancing contact angle
    • Contact angle hysteresis
    • Different geometry
    • Diffusion limited growth
    • Fabrication process
    • High aspect ratio
    • Self cleaning
    • Super-hydrophobic surfaces
    • Injection molding

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