Dye sensitized photoactive surfaces

Patent metadata

Field	Value
Publication number	US-10695723-B2
Application number	US-201615186524-A
Country	US
Kind code	B2
Filing date	Jun 19, 2016
Priority date	Jun 19, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

Upon light irradiation, a dye sensitized photoactive surfaces can undergo hydrophobic to hydrophilic conversion in both in air and oil environments.

First claim

What is claimed is:

1. An oil-water separation membrane comprising:
a matrix including a plurality of particles, wherein the particle surface is modified with a photosensitizer, such that the wettability of the surface having a nanotexture changes upon irradiation with light and includes a multilayer including a plurality of bilayers, each bilayer comprising:
a first layer including a polyelectrolyte polymer; and
a second layer including the plurality of particles modified by the photosensitizer in contact with the first layer.

2. The surface of claim 1 , wherein the plurality of particles include a metal oxide.

3. The surface of claim 2 , wherein the metal oxide includes TiO 2 , ZnO, WO 3 , SrTiO 3 , SnO 2 , V 2 O 5 , CeO 2 , CuO, MoO 3 , Fe 2 O 3 , Cr 2 O 3 or In 2 O 3 .

4. The surface of claim 2 , wherein the particle is a nanoparticle.

5. The surface of claim 1 , wherein the polyelectrolyte polymer includes poly(allylamine hydrochloride).

6. The surface of claim 1 , wherein the photosensitizer includes Chlorin.

7. The surface of claim 1 , wherein the photosensitizer includes a Ruthenium (II) polypyridyl complex.

8. The surface of claim 1 , wherein the photosensitizer is N3, D149, Chlorin, Coumarin 343, Eosin Y, N719, N621, N179, N749, N945, Z907, Z907-Na, Z910, Z675, Z646, Z991, K8, K19, K 2 O, K51, K60, K68, K73, K77, D5, D6, D102, D205, D29, D35, D37, DPP07, DPP13, DPP14, DPP15, DPP17, A1, A2, A3, A597, C101, C102, C217, CYC-B1, CYC-B3, CYC-B11, YS-1, YS-2, YS-3, YS-4, YS-5, YE05, Y123, YD2, YD2-o-C8, T18, T66, TFRS-1, TFRS-2, TFRS-3, HRS-1, SJW-E1, S8, JK-91, JK-92, LI17, HY2, DX1, SM371, SM315, RK1, NKX-2569, MB18-N, LEG4, DEK1, B18, D45, D51, D77, C106, N820, N823, N886, K9, N712, NKK-2553, NKK-2554, TG6, JF419, MKA253, L1, MK245, HSQ4, or P1.

9. The surface of claim 1 , wherein the particles are covalently bonded to the photosensitizer.

10. The surface of claim 1 , wherein the solid includes glass, fiber, stainless steel, inorganic materials or sand.

11. The surface of claim 10 , wherein the solid portion of the solid-liquid interface is coated with indium tin oxide.

12. An oil-water separation device including a membrane, the membrane incorporating the surface of claim 1 the membrane incorporated into the oil-water separation device.

13. A method of separating oil from water in an oil-water mixture with the oil-water separation membrane of claim 1 comprising:
contacting a surface of an oil-water separation membrane of claim 1 with the oil-water mixture; and
irradiating the surface with light.

14. The method of claim 13 , wherein the plurality of particles include a metal oxide.

15. The method of claim 14 , wherein the metal oxide includes TiO 2 , ZnO, WO 3 , SrTiO 3 , SnO 2 , V 2 O 5 , CeO 2 , CuO, MoO 3 , Fe 2 O 3 , Cr 2 O 3 or In 2 O 3 .

16. The method of claim 13 , wherein the photosensitizer includes Chlorin.

17. The method of claim 13 , wherein the photosensitizer includes a Ruthenium (II) polypyridyl complex.

18. A method of coating to make an oil water separation membrane of claim 1 comprising depositing on the polyelectrolyte polymer layer surface the matrix including the plurality of particles, wherein the surfaces of the particles are modified with a photosensitizer, wherein the wettability of the surface changes upon irradiation with light.

19. The method of claim 18 , wherein the plurality of particles include a metal oxide.

Assignees

• Massachusetts Inst Technology

Inventors

• Varanasi Kripa K
• Mckinley Gareth H
• Kwon Gibum
• Gondal Mohammad Ashraf

Classifications

• B01D17/045 Primary

  with coalescers · CPC title

• B01D2325/43

  Specific optical properties · CPC title

• B01D61/00

  Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor (separation of gases or vapours by diffusion B01D53/22) · CPC title

• B01D17/085

  with membranes · CPC title

• Y02E10/542

  Dye sensitized solar cells · CPC title