Microfabricated elastomeric valve and pump systems
A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.
1. A method of microfabricating an elastomeric structure, comprising:
microfabricating a first elastomeric layer, wherein the first elastomeric layer is fabricated on a first micromachined mold having at least one raised protrusion which forms at least one recess in the bottom of the first elastomeric layer;
microfabricating a second elastomeric layer, wherein the second elastomeric layer is fabricated on a second micromachined mold having at least one raised protrusion which forms at least one recess in the bottom of the second elastomeric layer;
positioning the second elastomeric layer on top of the first elastomeric layer such that at least one recess in the second layer substantially perpendicularly passes over at least one recess in the first layer; and
bonding a bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer.
2. method of claim 1 wherein the first and second elastomeric layers are microfabricated by replication molding.
3. The method of claim 1 wherein the first and second elastomeric layers are microfabricated by injection molding.
4. The method of claim 1 further comprising:
sequential addition of further elastomeric layers, whereby each layer is added by:
microfabricating a successive elastomeric layer; and
bonding the bottom surface of the successive elastomeric layer onto a top surface of the elastomeric structure.
5. The method of claim 1 wherein the first and second layers are bonded by a layer of adhesive.
6. The method of claim 1 wherein at least one of the elastomeric layers further comprises a conductive portion.
7. The method of claim 1 wherein the first elastomeric layer has a first Young's modulus and the second elastomeric layer has a second Young's modulus wherein at least one of the first and second Young's moduli is between 50 Pa and 10 MPa.
8. The method of claim 1 wherein the first elastomeric layer has a first Young's modulus and the second elastomeric layer has a second Young's modulus wherein at least one of the first and second Young's moduli is between 100 Pa and 1 MPa.
9. The method of claim 1 wherein the first elastomeric layer has an excess of a first chemical species and the second elastomeric layer has an excess of a second chemical species.
10. The method of claim 9 wherein the elastomeric layers comprise thermoset elastomers which are bonded together by heating above an elastic/plastic transition temperature of at least one of the first and second elastomeric layers.
11. The method of claim 9 wherein the first chemical species forms bonds with the second chemical species when at least one chemical species is activated.
12. The method of claim 9 wherein the first and second elastomeric layers are composed of the same component materials, but differ in the ratio in which the component materials are mixed together.