Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 19, 2024 - November 20, 2024
Cellulose nano-fiber (CNF) is a fundamental component of wood fiber. The single cellulose filament by assembling CNF shows excellent mechanical properties by improving the CNF orientation inside the filament. In this study, The CNF with silver nanoparticles was fabricated by mixing of CNF dispersion with Tollen’s reagent at 80 oC for 2 hours. The prepared CNF dispersion with nano particles loading was then introduced into an apertured flow channel with/without electric field. The CNF in the flow channel was aligned along the filament axis by the electric field and elongational flow formed in an apertured part. This study successfully fabricated the antibacterial filaments with silver nano particle loading. Furthermore, the effects of the mixture ratio of CNF dispersion with Tollen’s reagent, and applying electric field on the mechanical properties of the filament were clarified. As a result, the larger the content of the silver nano particles is, the higher the ultimate tensile strength of the filaments becomes. CNF orientation degree was improved under lower mixture ratio due to the lower viscosity of the dispersion allowing the CNF to rotate more with untangling. However, when the content of silver nano particles was rather high, the filament was not fabricated due to weaker hydrogen bonds between CNFs with excessive inclusion of silver particles. It was also elucidated that applying electric field effectively improves the ultimate tensile stress, elastic modulus, and toughness of the silver nano particles-loaded filaments even under high mixture ratio conditions.
