Functionalization of Cellulose Fibres with Oxygen Plasma and ZnO Nanoparticles for Achieving UV Protective Properties

Table 3

Ultraviolet protection factor (UPF), transmission () in the UVA and UVB region, ultraviolet radiation (UVR), UVA-, and UVB-blocking properties, and UPF rating of the cotton samples.

Sample	UPF	(UVA) (%)	(UVB) (%)	(UVR) (%)	UVA % blocking	UVB % blocking	UPF rating
UN	4.12	28.42	26.64	26.60	71.58	76.36	Unrateable
UN + ZnO	33.63	7.44	2.95	6.04	92.56	97.06	30
P_10 s + ZnO	58.52	6.73	1.59	5.16	93.27	98.41	50+
P_20 s + ZnO	61.86	6.41	1.46	4.90	93.59	98.54	50+
P_30 s + ZnO	65.93	6.13	1.53	4.727	93.87	98.47	50+

UN: untreated, P_10 s: oxygen plasma-treated for 10 s, P_20 s: oxygen plasma-treated for 20 s, P_30 s: oxygen plasma-treated for 30 s, and ZnO: functionalization with ZnO nanoparticles.