Method for manufacturing a separation membrane based on a polar carbon nanotube dispersion and a polar one-dimensional carbon body
View Patent ↗Provided are a polar carbon nanotube dispersion which may be dispersed in a solvent at a high concentration, and a separator having improved filtration efficiency based on a polar carbon nanotube manufactured from the dispersion and a polar one-dimensional carbon body. According to the separator and the method for manufacturing the same of the present invention, a polar carbon nanotube dispersion which may be dispersed in a solvent at a high concentration even without use of a surfactant or a stabilizer may be prepared, and a separator which is not easily exfoliated and may be stably used even under a high pressure may be manufactured, based on a polar carbon nanotube prepared from the polar carbon nanotube dispersion and a polar one-dimensional carbon body.
1 . A separator comprising:
a porous support;
a porous first coating layer including a polar carbon nanotube, placed on the porous support; and
a second coating layer including a polar one-dimensional carbon body, placed on the porous first coating layer, and
wherein the porous first coating layer does not comprise a surfactant.
2 . The separator of claim 1 , wherein the polar carbon nanotube has an oxygen/carbon atomic ratio of 0.1 or more and a full width at half maximum of 2.0 or more at a position of 2θ=25.6° of XRD.
3 . The separator of claim 1 , wherein the porous first coating layer is prepared by applying a viscoelastic polar carbon nanotube dispersion.
4 . The separator of claim 1 , wherein a polar group of the polar carbon nanotube is positioned on a surface of the carbon nanotube.
5 . The separator of claim 1 , wherein a polar group of the polar one- dimensional carbon body includes any one or more selected from the group consisting of a hydroxyl group, an epoxy group, and a carboxyl group.
6 . The separator of claim 5 , wherein the polar group is unevenly distributed at an edge of the polar one-dimensional carbon body.
7 . The separator of claim 1 , wherein the polar one-dimensional carbon body is a graphene nanoribbon.
8 . The separator of claim 1 , wherein an interlayer spacing of the second coating layer is 5 to 20 Å.
9 . The separator of claim 1 , wherein a thickness ratio between the porous first coating layer and the second coating layer is 5:1 to 20:1.
10 . The separator of claim 1 , wherein the polar carbon nanotube has a lower oxygen/carbon atomic ratio than the polar one-dimensional carbon body.
11 . The separator of claim 1 , wherein an organic dye rejection rate is 80% or more and a sodium chloride rejection rate is 20% or less, with respect to a mixture including sodium chloride and an organic dye, under a condition of 10 bar.