Uniaxially alignedcellulosenanofibers (CNFs), which are fabricated by electrospinning of cellulose acetate
derived from bamboo cellulose (B-CA) followed by deacetylation, were used as reinforcements to make
optically transparent composite films. We examined the effects of B-CA concentration and electrospinning
parameters (e.g. spinning distance, and collection speed) on fiber morphology and orientation,
which act on mechanical-to-optical properties of the CNFs-reinforced composites. Consequently, the
resultant composite film exhibits high visible-light transmittance even with high fiber content, as well as
improved mechanical properties. The understanding obtained from this study may facilitate the development
of novel nanofibrous materials for various optical uses.