Super-hydrophobic hierarchical structures, method of forming them and medical devices incorporating them
First Claim
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1. A method of making a synthetic polymer substrate comprising a hierarchical surface structure of multiple domes and multiple pillars on said domes, comprising:
- forming an array of dome-shaped depressions, each having a diameter and a depth, in a non-aluminum solid template substrate;
forming a porous surface on said dome-shaped depressions, wherein said porous surface is formed of a material different from that of said solid template substrate; and
contacting said porous surface with a synthetic polymer thermoplastic film under temperature and pressure conditions sufficient to cause said thermoplastic to flow into pores of said porous surface and said dome-shaped depressions to form an imprinted film having said hierarchical surface structure.
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Abstract
Synthetic polymer substrates comprising a hierarchical surface structure of multiple domes and multiple pillars on said domes, wherein said substrate is a synthetic polymer film, said domes have diameters in the range from about 5 μm to about 400 μm, heights in the range from about 2.5 μm and about 500 μm, and said pillars have diameters in the range from about 20 nm to about 5 μm and aspect ratios of from about 2 to about 50, and methods of making and using them.
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Citations
16 Claims
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1. A method of making a synthetic polymer substrate comprising a hierarchical surface structure of multiple domes and multiple pillars on said domes, comprising:
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forming an array of dome-shaped depressions, each having a diameter and a depth, in a non-aluminum solid template substrate; forming a porous surface on said dome-shaped depressions, wherein said porous surface is formed of a material different from that of said solid template substrate; and contacting said porous surface with a synthetic polymer thermoplastic film under temperature and pressure conditions sufficient to cause said thermoplastic to flow into pores of said porous surface and said dome-shaped depressions to form an imprinted film having said hierarchical surface structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of making a synthetic polymer substrate comprising a hierarchical surface structure of multiple domes and multiple pillars on said domes, comprising:
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forming an array of dome-shaped depressions by micromachining, each having a diameter and a depth, in a metal substrate; forming a porous surface on said dome-shaped depressions, wherein said porous surface is a free standing polycarbonate filter membrane having pores therein, which is placed on the surface of said solid template substrate and forced into said dome-shaped depressions under said temperature and pressure conditions; contacting said porous surface with a synthetic polymer thermoplastic film under temperature and pressure conditions sufficient to cause said thermoplastic to flow into pores of said porous surface and said dome-shaped depressions to form an imprinted film having said hierarchical surface structure; and removing a combined polycarbonate filter membrane and polymer film from said mold and dissolving said polycarbonate filter membrane with a solvent, leaving said polymer substrate comprising a hierarchical surface structure.
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Specification