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Reconfigurable microfluidic systems are based on networks of microfluidic cavities connected by hydrophobic microfluidic channels. Each cavity is classified as either a reservoir or a node, and includes a pressure port via which gas pressure may be applied. Sequences of gas pressures, applied to res

Reconfigurable microfluidic systems are based on networks of microfluidic cavities connected by hydrophobic microfluidic channels. Each cavity is classified as either a reservoir or a node, and includes a pressure port via which gas pressure may be applied. Sequences of gas pressures, applied to reservoirs and nodes according to a fluid transfer rule, enable fluid to be moved from any reservoir to any other reservoir in a system. Such systems are suitable for automated microwell plate interfaces.

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1. A reconfigurable microfluidic system comprising: (a) a network of microfluidic cavities connected by hydrophobic microfluidic channels exhibiting, during operation, a hydrophobic threshold pressure, wherein:reservoirs are cavities that are connected to only one channel each, and nodes are cavitie

1. A reconfigurable microfluidic system comprising: (a) a network of microfluidic cavities connected by hydrophobic microfluidic channels exhibiting, during operation, a hydrophobic threshold pressure, wherein:reservoirs are cavities that are connected to only one channel each, and nodes are cavities that are connected to two or more channels each;a plurality of the channels connect at most two cavities each;a plurality of the cavities are connected to at most four channels each;a plurality of the channels have a greater resistance to fluid flow than that of the nodes;a plurality of the cavities include a gas pressure port; and at least one cavity has an input/output tube disposed above a well of the microwell plate, the input/output tube having a greater resistance to fluid flow than that of the microfluidic channels; and(b) a pressure sequencer including a set of gas valves, the pressure sequencer configured to connect, by gas tubing, to: a first high pressure gas source, a second high pressure gas source, a low pressure gas source, a partial vacuum pressure gas source, and to at least one cavity, wherein the first high gas pressure is greater than the second high gas pressure, the second high gas pressure is greater than the low gas pressure, the low gas pressure is greater than the partial vacuum pressure, and the partial vacuum pressure is less than atmospheric pressure, the pressure sequencer programmed to apply to at least one cavity, according to pressure sequence data following a fluid transfer rule in which:the first high gas pressure is applied to a first origin cavity from which a fluid is expelled via its input/output tube and the first high gas pressure is also applied to any other cavity connected to the first origin cavity by a first channel;the second high gas pressure is applied to a second origin cavity from which a fluid is transferred and the low gas pressure is applied to a first destination cavity to which the fluid is transferred, and the second high gas pressure is applied to any cavity (other than the first destination cavity) connected to the origin cavity by a second channel and the low gas pressure is applied to any cavity (other than the second origin cavity) connected to the first destination cavity by the second channel; andthe partial vacuum gas pressure is applied to a second destination cavity to which a fluid is drawn via its input/output tube and low gas pressure is applied to any other cavity connected to the second destination cavity by a third channel. 2. The reconfigurable microfluidic system of claim 1, comprising a plurality of the cavities spaced apart from their nearest neighbors by 9 mm. 3. The reconfigurable microfluidic system of claim 1, comprising a plurality of the cavities spaced apart from their nearest neighbors by 4.5 mm. 4. The reconfigurable microfluidic system of claim 1, comprising a plurality of the cavities spaced apart from their nearest neighbors by 2.25 mm. 5. The reconfigurable microfluidic system of claim 1, comprising a plurality of the channels having a resistance to fluid flow at least 100 times greater than that of the nodes. 6. The reconfigurable microfluidic system of claim 1, comprising a plurality of the channels having a resistance to fluid flow at least 1,000 times greater than that of the nodes. 7. The reconfigurable microfluidic system of claim 1, comprising a plurality of the channels having a resistance to fluid flow at least 10,000 times greater than that of the nodes. 8. The reconfigurable microfluidic system of claim 1, the cavities being formed in a hydrophobic microfluidic layer that is bonded to a substrate layer, and the cavities being sealed by a pneumatic layer that is bonded to the microfluidic layer. 9. The reconfigurable microfluidic system of claim 8, the microfluidic layer being made from polydimethylsiloxane (PDMS). 10. The reconfigurable microfluidic system of claim 8, the microfluidic layer being made from fluorinated ethylene propylene (FEP). 11. The reconfigurable microfluidic system of claim 8, the microfluidic layer being made from polytetrafluoroethylene (PTFE). 12. The reconfigurable microfluidic system of claim 8, the pneumatic layer including a gas manifold that serves as a pressure port for two or more cavities. 13. The reconfigurable microfluidic system of claim 1 further comprising fluid tubing connecting a cavity to an external fluid store maintained at atmospheric pressure. 14. The reconfigurable microfluidic system of claim 1 further comprising gas tubing connecting one or more cavities to gas pressure sources via the gas pressure ports. 15. The reconfigurable microfluidic system of claim 1, at least one microfluidic channel having a gas pressure port. 16. The reconfigurable microfluidic system of claim 1, a plurality of the hydrophobic microfluidic channels presenting a hydrophobic pressure barrier to fluid flow that is less than the pressure difference between the second high gas pressure and the low gas pressure. 17. A method for arranging fluid in a microwell plate comprising operating the reconfigurable microfluidic system of claim 1 according to a set of pressure sequence data that causes the fluid to be drawn into the network from one well of the microwell plate and expelled into another well of the microwell plate. 18. The reconfigurable microfluidic system of claim 1, wherein the second high pressure is about 2 kPa and the low pressure is about 0 kPa. 19. The reconfigurable microfluidic system of claim 1, wherein the first high pressure is about 20 kPa, 25 kPa, 30 kPa, 35 kPa or 40 kPa above atmospheric pressure. 20. The reconfigurable microfluidic system of claim 1, wherein, during operation, the hydrophobic threshold pressure of hydrophobic microfluidic channels keeps fluid in nodes and reservoirs from leaking into the channels when no pressure differences are applied. 21. The reconfigurable microfluidic system of claim 20, wherein the hydrophobic threshold pressure of hydrophobic microfluidic channels is about 1 kPa. 22. The reconfigurable microfluidic system of claim 8, wherein the substrate layer is made of glass, polydimethylsiloxane (PDMS), polyethylene terephthalate (PET), or a hydrophobic thermoplastic polymer. 23. The reconfigurable microfluidic system of claim 22, wherein the hydrophobic thermoplastic polymer is a cyclic olefin copolymer (COC). 24. The reconfigurable microfluidic system of claim 1, wherein the microfluidic channels comprise cross-sectional dimensions in the range of about 100 μm to about 300 μm.