Stability, Viscosity, and Tribology Properties of Polyol Ester Oil-Based Biolubricant Filled with TEMPO-Oxidized Bacterial Cellulose Nanofiber

Table 1

The composition of NDCt (N) and Span 60 (S) in the POE biolubricant.

Sample	Ratio of NDCt to Span 60	Mass fraction (wt%)
		POE	NDCt	Span 60
PO	0	100	0	0
N1S2	1 : 2	99.1	0.3	0.6
N1S3	1 : 3	98.8	0.3	0.9
N2S4	2 : 4	98.2	0.6	1.2