IP Library › Granted Patent US 12,384,699
Granted Patent B2
US 12,384,699 · App. 17/849,675 · Granted Aug 12, 2025

Self-assembled surfactant structures

Inventors: Adrian Brozell (Los Gatos, CA); Arian Abed-Amoli (Belmont, CA)
Assignee: CROSSTEK HOLDING COMPANY LLC
C02F1/44B01D63/10B01D67/00B01D67/0004B01D67/0048B01D67/0088B01D69/02B01D69/10B01D69/122B01D71/025B01D71/027H01M8/1055B01D61/002B01D61/025B01D61/027B01D61/145B01D61/147B01D2323/12B01D2325/20H01M8/04197H01M8/1009H01M8/1011H01M8/1023H01M8/1039H01M8/1074Y02E60/50Y02P70/50
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Quick Facts
Patent No.
US 12,384,699
App. No.
17/849,675
Granted
Aug 12, 2025
Kind
B2
Abstract

Stabilized surfactant-based membranes and methods of manufacture thereof. Membranes comprising a stabilized surfactant mesostructure on a porous support may be used for various separations, including reverse osmosis and forward osmosis. The membranes are stabilized after evaporation of solvents; in some embodiments no removal of the surfactant is required. The surfactant solution may or may not comprise a hydrophilic compound such as an acid or base. The surface of the porous support is preferably modified prior to formation of the stabilized surfactant mesostructure. The membrane is sufficiently stable to be utilized in commercial separations devices such as spiral wound modules. Also a stabilized surfactant mesostructure coating for a porous material and filters made therefrom. The coating can simultaneously improve both the permeability and the filtration characteristics of the porous material.

Claims (25)

1. A membrane comprising:

a stabilized surfactant mesostructure bonded to a surface of a porous support, the porous support comprising a set of pores with sizes configured to prevent a precursor solution from permeating prior to formation of the stabilized surfactant mesostructure;

a material disposed between the stabilized surfactant mesostructure and the surface of the porous support, the material being an oxidized material preserving a bonding between the stabilized surfactant mesostructure and the surface of the porous support; and

an additional porous structure disposed on the porous support, wherein configuration of the porous support, material and additional porous structure enables transport across the stabilized surfactant mesostructure.

2. The membrane of claim 1 , wherein the configuration of the porous support, material and additional porous structure is configured as a spiral bound module, wherein the spiral bound module is used for osmosis applications.

3. The membrane of claim 1 , wherein the configuration of the porous support, material and additional porous structure is configured as a plate and frame module for permeation.

4. The membrane of claim 1 , wherein the material is configured as a permeate carrier respective to the configuration of the porous support, material and additional porous structure.

5. The membrane of claim 1 , wherein the stabilized surfactant mesostructure comprises surfactant molecules, wherein the material stabilizes alignment of the surfactant molecules.

6. The membrane of claim 5 , wherein the stabilized surfactant mesostructure comprises lamellae, wherein the lamellae comprises the material, and wherein the material is porous.

7. The membrane of claim 5 , wherein the material is non-porous.

8. The membrane of claim 7 , wherein the stabilized surfactant mesostructure comprises hexagonally packed columns comprising circularly arranged surfactant molecules, wherein each of the columns are substantially surrounded by the non-porous material.

9. The membrane of claim 1 , wherein the material is selected from a group consisting of: silanes, organics, inorganics, metals, metal oxides, an alkyl silane, calcium and silica.

10. The membrane of claim 1 , wherein the surface of the porous support is oxidized, melted and resolidified prior to bonding of the stabilized surfactant mesostructure.

11. The membrane of claim 1 , wherein a placement of the additional porous structure provides stability for the porous support.

12. The membrane of claim 11 , wherein the additional porous structure is at least one of a chemical support and a mechanical support.

13. The membrane of claim 1 , further comprising:

a second porous support, wherein the stabilized surfactant mesostructure is sandwiched between the porous support and the second porous support.

14. The membrane of claim 1 , wherein the membrane has a tortuosity of less than approximately 1.09.

15. The membrane of claim 1 , wherein the pore size of the stabilized surfactant mesostructure is in a range between 0.3 Angstroms and 4 nm.

16. The membrane of claim 1 , wherein the membrane has a porosity greater than approximately 1%.

17. The membrane of claim 1 , wherein the porous support is at least one of a plastic material and cellulose material.

18. The membrane of claim 1 , further comprising:

a second stabilized surfactant mesostructure bonded to a side of the porous support opposite from the surface of the porous support.

19. The membrane of claim 1 , wherein the membrane comprises a plurality of membranes, wherein the plurality of membranes are organized as stacked layers of membranes.

20. The membrane of claim 1 , wherein the precursor solution is used for stabilization of the surfactant mesostructure.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 8, 2026
From: CROSSTEK HOLDING COMPANY LLC
To: DIAMOND GOLD INVESTORS, LLC
Reel/Frame 073408/0453 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 14, 2022
From: DIAMOND GOLD INVESTORS, LLC
To: CROSSTEK HOLDING COMPANY LLC
Reel/Frame 061430/0209 →
Continuity (7)
Continuation 16374245 · Apr 3, 2019
Continuation 13684449 · Nov 23, 2012
Continuation In Part 13113930 · May 23, 2011
Provisional Application 61562956 · Nov 22, 2011
Provisional Application 61415761 · Nov 19, 2010
Provisional Application 61347317 · May 21, 2010
Related Publication 20230150841A1 · May 18, 2023
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