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1. (WO2017098207) METHODS OF PURIFYING NANOSTRUCTURES
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1 . A method of purifying nanostructures, the method comprising:

providing a plurality of nanostructures in solution; and

filtering the nanostructures in solution by cross-flow filtration.

2. The method of claim 1 , wherein the nanostructures are nanowires.

3. The method of claim 2, wherein the nanowires are metallic or semiconducting.

4. The method of claim 3, wherein the nanowires are metallic and include Ag, Au, Pt, Cu, Co, Fe and/or Ni.

5. The method of any one of claims 2 to 4, wherein the nanowires are silver nanowires.

6. The method of any one of claims 2 to 5, wherein the nanowires have a length (longest dimension) of from 30 pm to 90 pm.

7. The method of any one of claims 2 to 6, wherein the nanowires have a width (shortest dimension) of from 80 nm to 150 nm.

8. The method of any one of claims 2 to 7, wherein the nanowires have an aspect ratio (length divided by width) of from 200 to 900.

9. The method of any one of claims 1 to 8, wherein the step of providing a plurality of nanostructures in solution includes forming the nanostructures.

10. The method of claim 9, wherein forming the nanostructures includes forming the nanostructures by the polyol method.

1 1 . The method of claim 10, wherein the nanostructures are silver nanowires and the polyol method proceeds by the reactions:

2HOCH2CH2OH ► 2CH3CHO + 2H20

2Ag+ + 2CH3CHO ► CH3CHO-OHCCH3 + 2Ag + 2H+

12. The method of any one of claims 9 to 1 1 , wherein the step of forming the nanostructures occurs on a scale of greater than 1 litre batches.

13. The method of any one of claims 1 to 12, wherein the step of filtering the nanostructures in solution by cross-flow filtration includes the step of passing the solution comprising nanostructures through a cross-flow filter.

14. The method of claim 13, wherein step of passing the solution comprising nanostructures through a cross-flow filter includes passing the solution through a cross-flow filter having a mean mesh size of 20 to 40 pm.

15. The method of claim 14, wherein step of passing the solution comprising nanostructures through a cross-flow filter includes passing the solution through a cross-flow filter having a mean mesh size of 30 pm plus or minus 10%.

16. The method of any one of claims 1 to 15, wherein the step of filtering the nanostructures in solution by cross-flow filtration includes the step of passing the solution comprising nanostructures through a cross-flow filter at a rate of 400 ml/min to 2 l/min.

17. The method of claim 16, wherein the step of filtering the nanostructures in solution by cross-flow filtration includes the step of passing the solution comprising nanostructures through a cross-flow filter at a rate of 500 ml/min to 1 l/min.

18. The method of any one of claims 1 to 17, wherein the step of filtering the nanostructures in solution by cross-flow filtration includes the step of passing the solution comprising nanostructures through a cross-flow filter, the cross-flow filter comprising a vibration system for vibrating the mesh and mitigating clogging of the membrane.

19. A method of forming a transparent conductor, the method comprising: purifying nanostructures according to the method any one of claims 1 to

18; and

fabricating a transparent conductor incorporating the nanostructures.

20. Nanostructures obtainable by the method of any one of claims 1 to 18.

21 . Nanostructures obtained by the method of any one of claims 1 to 18.

22. Transparent conductors obtainable by the method of claim 19.

23. Transparent conductors obtained by the method of claim 19.

24. Use of a cross-flow filter to filter a solution comprising nanostructures.

25. The use of claim 24, wherein the cross-flow filter has a mean mesh size of 20 to 40 pm.

26. The use of claim 25, wherein the cross-flow filter has a mean mesh size of 30 pm plus or minus 10%.

27. A method of forming nanostructures, wherein the method occurs on a scale of greater than 1 litre batches.

28. The method of claim 27, wherein the nanostructures are silver nanowires.

29. The method of claim 27 or claim 28, wherein forming the nanostructures includes forming the nanostructures by the polyol method.

30. The method of claim 29, wherein the nanostructures are silver nanowires and the polyol method proceeds by the reactions:

2HOCH2CH2OH ► 2CH3CHO + 2H20

2Ag+ + 2CH3CHO ► CH3CHO-OHCCH3 + 2Ag + 2H+

31 . A method as hereinbefore described, with reference to Figure 1 .

32. Any novel feature or combination of features disclosed herein.