Manufacture of titanium dioxide structures

A method for manufacturing a structure of a titanium compound selected from the group consisting of sheets, wires and tubes, the method comprising

• ab) providing a dispersion of particles comprising TiO2, wherein the average diameter of the particles in the dispersion is 3-20 nm, and wherein the dispersion comprises citric acid,
• wherein the dispersion after step ab) comprises at least 15 wt % TiO2,
• c) adjusting the concentration of hydroxide ions in the dispersion from step ab) to at least 8 M by adding an alkali metal hydroxide MOH,
• d) treating the dispersion from step c) at a temperature in the interval 90-170° C. during 6-72 hours to obtain a plurality of first structures comprising alkali metal titanate, and
• e) treating the plurality of first structures comprising alkali metal titanate to exchange at least a part of the alkali metal ions M+ with H+ to obtain a plurality of second structures comprising protonated titanate.