Nanocellulose-based anti-fogging composition
An anti-fogging composition is described herein. The composition includes a nanocellulose comprising cellulose nanofibrils, cellulose nanocrystals, or a combination thereof, and water. A method of preparing an anti-fogging coating includes applying the anti-fogging composition to at least a portion of a surface of a substrate to form a coating. An article including a coating formed from the anti-fogging composition is also disclosed. Coatings prepared from the anti-fogging compositions are water proof, and offer a cost-effective alternative to other anti-fogging coatings.
1. A method of preventing fog on a surface, the method comprising:
applying an anti-fogging composition to the surface,
wherein the anti-fogging composition comprises
a nanocellulose comprising cellulose nanofibrils, cellulose nanocrystals, or a combination thereof;
a surfactant:
a water-soluble polymer; and
water; and
removing at least a portion of the water from the surface to provide a coating disposed on at least a portion of the surface, wherein the coating has a thickness of 100 nanometers to 2 micrometers.
2. The method of claim 1 , wherein applying the anti-fogging composition comprises solution coating, spray coating, wiping using a saturated sponge or cloth, or a combination thereof.
3. The method of claim 1 , wherein the surface is a glass surface, a ceramic surface, a metal surface, or a polymeric surface.
4. The method of claim 1 , wherein the composition further comprises a plurality of nanoparticles.
5. The method of claim 4 , wherein the anti-fogging composition comprises
0.1 to 0.5 weight percent nanocellulose;
0.25 to 1 weight percent of the surfactant;
0.01 to 0.5 weight percent of the water-soluble polymer; and
98 to 99.55 weight percent water;
wherein weight percent is based on the total weight of the composition.
6. The method of claim 5 , wherein
the nanocellulose comprises cellulose nanofibrils;
the surfactant is an alkali metal salt of coconut oil; and
the water-soluble polymer is xanthan gum.
7. The method of claim 1 , wherein the surfactant comprises a polyoxyalkylene, an organosiloxane, a C 3-20 perfluoroalkyl group, a C 4-24 fatty acid or an alkali metal salt thereof, or a combination thereof.
8. The method of claim 1 , wherein the surfactant is an alkali metal salt of coconut oil.
9. The method of claim 1 , wherein the water-soluble polymer comprises polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, methyl cellulose, hydroxypropyl methylcellulose, xanthan gum, pectin, guar gum, carrageenan, chitosan, gelatin, gum arabic, or a combination thereof.
10. The method of claim 1 , wherein the water-soluble polymer comprises xanthan gum.
11. The method of claim 4 , wherein the nanoparticles comprise silica nanoparticles, zinc oxide nanoparticles, titanium dioxide nanoparticles, or a combination thereof.
12. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 10 weight percent nanocellulose.
13. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 1.5 weight percent nanocellulose comprising cellulose nanofibrils.
14. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 8 weight percent nanocellulose comprising cellulose nanocrystals.
15. The method of claim 1 , wherein the anti-fogging composition comprises
0.1 to 1.5 weight percent of the nanocellulose;
0.01 to 1 weight percent of the surfactant;
0.01 to 1 weight percent of the water-soluble polymer; and
96.5 to 99.88 weight percent water;
wherein weight percent is based on the total weight of the composition.