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US 2019/0292340 A1Published application
Transparent and homogenous cellulose nanocrystal-lignin uv protection films
AssigneeAuburn University
InventorsZhihua Jiang, Mahesh Parit
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Abstract
A visibly transparent, homogeneous UV-blocking cellulose nanocrystal/lignin nanocomposite film and a method of making the same. The film is made by dispersing cellulose nanocrystals and lignin in an aqueous, alkaline solution to yield a dispersion; casting the dispersion onto a substrate; and evaporating the aqueous, alkaline solution to yield a homogeneous, visibly transparent film that at least partially absorbs ultraviolet (UV) radiation.
Claims20
A composition of matter prepared by a process comprising:
- (a) dispersing cellulose nanocrystals and lignin in an aqueous, alkaline solution to yield a dispersion;
- (b) casting the dispersion of step (a) onto a substrate;
- and then
- (c) evaporating the aqueous, alkaline solution for a time and at a temperature to yield a homogeneous, visibly transparent film that at least partially absorbs ultraviolet (UV) radiation falling within a wavelength range selected from the group consisting of ultraviolet A (UVA, about 315 nm to about 400 nm), ultraviolet B (UVB, about 280 nm to about 315 nm) and ultraviolet C (UVC, about 100 nm to about 280 nm).
1 more element
A method of making a visibly transparent, UV-blocking film, the method comprising:
- (a) dispersing cellulose nanocrystals in an aqueous, alkaline solution to yield a dispersion;
- (b) casting the dispersion of step (a) onto a substrate;
- and then
- (b) evaporating the aqueous, alkaline solution for a time and at a temperature to yield a homogeneous, visibly transparent film that at least partially absorbs ultraviolet (UV) radiation falling within a wavelength range selected from the group consisting of ultraviolet A (UVA, about 315 nm to about 400 nm), ultraviolet B (UVB, about 280 nm to about 315 nm) and ultraviolet C (UVC, about 100 nm to about 280 nm).
1 more element
Dependencies are inferred from the claim text.