The CNWs suspension was obtained by acid hydrolysis of com-mercial cotton. About 5 g of commercial cotton was dispersed in100 mL of sulfuric acid (64 wt%) at 45◦C under vigorous stirring for60 min. The suspensions were then washed with deionized waterusing repeatedly centrifuge cycles (10 min at 12,000 rpm for a cycle)until the suspension reached neutrality. Finally, the samples wereultrasonic treated for 10 min in an ice bath. The resulted CNWssuspension was concentrated to 1.59 wt% by evaporation.