Superhydrophobic poly(dimethylsiloxane) and methods for making the same
AssigneePeking University
InventorsHongwei Ma, Tongcheng Qian, Yuanzi Wu
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Abstract
A hydrophobic coating having a contact angle of at least about 150 degrees is disclosed herein, which coating comprises: a polymer substrate comprising a first linker incorporated therein at a specified surface density of from about 3×10−4 to about 9×10−8 units per nm2; a first polymer layer in contact with said first linker; a second linker in contact with said first polymer layer; and a second polymer layer in contact with said second linker. Also disclosed herein are methods for producing the hydrophobic coating. This hydrophobic coating is useful for making microfluidic devices having a hydrophobic coating on the microfluidic channels, as well as other uses in the field of microfluidics.
Claims20
An article comprising a hydrophobic coating having a contact angle of at least about 150 degrees, wherein the coating comprises:
- a polymer substrate comprising poly(dimethyl) siloxane (PDMS) and a first linker incorporated therein at a specified surface density of from about 3×10−4 to about 9×10−8 units per nm2;
- a first polymer layer in contact with said first linker;
- a second linker in contact with said first polymer layer;
- and
- a second polymer layer in contact with said second linker;
- wherein the article is selected from the group consisting of a microfluidic device, wherein the microfluidic device comprises at least one channel disposed thereon, a lab-on-a-chip, a boat, and a marine monitoring device.
A microfluidic device comprising:
- at least one channel disposed thereon;
- and
- a hydrophobic coating having a contact angle of at least about 150 degrees, wherein the coating comprises:
- a polymer substrate comprising poly(dimethyl) siloxane (PDMS) and a first linker incorporated therein at a specified surface density of from about 3×10−4 to about 9×10−8 units per nm2;
- a first polymer layer in contact with said first linker;
- a second linker in contact with said first polymer layer;
- and
- a second polymer layer in contact with said second linker.
A method for making a hydrophobic coating having a contact angle of at least about 150 degrees, said method comprising:
- 1) polymerizing a mixture comprising a poly(dimethyl-methylvinylsiloxane) prepolymer, poly(dimethyl-methylhydrogensiloxane) precursors and undec-10-enyl-2-bromo-2-methylpropanoate, under thermal conditions to form a polymer substrate;
- 2) contacting oligo(ethylene glycol) methacrylate with said polymer substrate under first polymerizing conditions to provide a first polymer layer bound to the polymer substrate through the undec-10-enyl-2-bromo-2-methylpropanoate;
- 3) contacting 2-bromoisobutyryl bromide with said first polymer layer under reaction conditions to provide a reactive surface;
- and
- 4) contacting 1H, 1H, 2H, 2H-perfluorodecyl methacrylate with said reactive surface under second polymerizing conditions to provide the hydrophobic coating.
Dependencies are inferred from the claim text.