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US 11,891,304 B2Granted
Method of preparing a stable nanofluid of amphiphilic Janus nanosheets in salt water
AssigneeUniversity of Houston System
InventorsZhifeng Ren, Dan Luo, Feng Wang
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Abstract
A stable water based nanofluid of graphene-based amphiphilic Janus nanosheets, where the nanofluid has a high salt-content while retaining the interfacial activities of the nanosheets. Such a nanofluid of amphiphilic Janus nanosheets may be used for enhanced oil recovery.
Claims14
A salt water dispersed nanofluid, wherein the nanofluid comprises:
- a dispersion comprising:
- polyelectrolyte comprising poly sodium 4-styrenesulfonate (PSS);
- amphiphilic Janus nanosheets comprising graphene oxide derivatized with at least one alkylamine group;
- NaCl;
- and
- CaCl2),
- wherein the dispersion comprises at least 3.5 wt. % NaCl and at least about 0.5 wt. % CaCl2), and wherein the salt water dispersed nanofluid maintains a same interface behavior in brine as in fresh water, thus indicating colloidal stability.
4 more elements
Dependencies are inferred from the claim text.