Bulk synthesis of Janus nanomaterials

1. A method of synthesizing Janus material, comprising:

forming a lamellar phase comprising water layers and organic layers;

incorporating nanosheets into the lamellar phase;

adding a functional agent into the lamellar phase; and

attaching the functional agent to the nanosheets in the lamellar phase to form Janus nanosheets.

2. The method of claim 1 , wherein forming the lamellar phase is contemporaneous with incorporating the nanosheets into the lamellar phase, and wherein the organic layers comprise oil layers.

3. The method of claim 1 , wherein the lamellar phase comprises a surfactant, wherein hydrophilic heads of the surfactant contact the water layers, and wherein hydrophobic tails of the surfactant contact the organic layers.

4. The method of claim 1 , wherein the nanosheets comprise hydrophilic nanosheets, wherein incorporating the nanosheets comprises incorporating the nanosheets into the water layers, and wherein adding the functional agent comprises adding the functional agent into the organic layers.

5. The method of claim 1 , wherein the functional agent comprises a silane coupling agent having a functional group.

6. The method of claim 1 , wherein attaching the functional agent comprises attaching the functional agent to the nanosheets at interfaces of the water layers and organic layers.

7. The method of claim 1 , wherein the nanosheets comprise graphene nanosheets, and wherein the Janus nanosheets comprise Janus graphene nanosheets.

8. The method of claim 1 , wherein the nanosheets comprise graphene oxide (GO) nanosheets, wherein the Janus nanosheets comprise Janus GO nanosheets.

9. The method of claim 1 , comprising collecting the lamellar phase having the Janus nanosheets for an enhanced oil recovery (EOR) application without separating the Janus nanosheets from the lamellar phase.

10. A method of synthesizing Janus material, comprising:

forming a lamellar phase comprising a surfactant, water layers, and oil layers;

incorporating hydrophilic nanosheets into the water layers;

placing a functional agent into the oil layers; and

allowing the functional agent to attach to the hydrophilic nanosheets in the lamellar phase to form Janus nanosheets.

11. The method of claim 10 , wherein forming the lamellar phase and incorporating the hydrophilic nanosheets comprises forming a water suspension of the nanosheets in water and building the lamellar phase with the water suspension such that as the lamellar phase forms, the hydrophilic nanosheets are simultaneously incorporated into the water layers in the lamellar phase.

12. The method of claim 10 , wherein lamellar units of the lamellar phase each comprise a respective water layer and respective oil layer, and wherein the lamellar units are respective nanoreactors attaching the functional agent to the hydrophilic nanosheets to form the Janus nanosheets.

13. The method of claim 10 , wherein the functional agent comprises hydrophobic molecules, and wherein allowing the functional agent to attach to the hydrophilic nanosheets comprises the functional agent attaching onto a surface of a hydrophilic nanosheet converting that surface to hydrophobic.

14. The method of claim 10 , wherein hydrophilic nanosheets comprise graphene oxide (GO) nanosheets, and wherein the Janus nanosheets comprise Janus GO nanosheets.

15. A method of synthesizing Janus material, comprising:

forming a lamellar phase comprising a surfactant, water layers, and organic layers;

incorporating graphene oxide (GO) nanosheets into the water layers;

adding a functional agent into the organic layers; and

attaching the functional agent to the GO nanosheets at interfaces of the water layers and the organic layers to form Janus nanoparticles comprising Janus GO nanosheets.

16. The method of claim 15 , wherein a lamellar unit of the lamellar phase comprises a water layer and an organic layer, wherein the lamellar unit comprises a nanoreactor, and wherein the lamellar phase comprises at least 100,000 lamellar units.

17. The method of claim 15 , wherein a nanoreactor forming Janus GO nanosheets comprises an interface between a water layer of the lamellar phase and an organic layer of the lamellar phase, and wherein the attaching of the functional agent to the GO nanosheets occurs at the interface.

18. The method of claim 15 , wherein the surfactant comprises an enhanced oil recovery (EOR) agent for flooding or chemical injection, or both.

19. The method of claim 15 , comprising collecting the lamellar phase having the Janus GO nanosheets for application as an EOR agent.

20. The method of claim 19 , applying the collected lamellar phase having the Janus GO nanosheets as the EOR agent to a geological formation.