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Updated: May 16, 2025
Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles
Published on: May 26, 2016
Magnetoresponsive Cellulose Nanofiber Hydrogels: Dynamic Structuring, Selective Light Transmission, and Information
Junhua Xu1,2, Yujun Zou1, Huangjingyi Chen1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, College of Light Industry and Food Engineering, Nanjing Forestry University, Longpan Road 159, Nanjing 210037, China.
Abstract:
Angle-dependent light reflection is a common phenomenon in nature, typically arising from the spatial arrangement of biological or mineral structures. Various strategies have been developed to replicate these assemblies, particularly to achieve structural color through bottom-up self- and directed assembly. However, dynamic control of light reflection remains a significant challenge. In this study, we present TEMPO-oxidized cellulose nanofibers modified with magnetic nanoparticles (approximately 10 nm in size) that exhibit rapid, directional alignment in aqueous media under magnetic fields, resulting in angle-dependent light reflection. By combining magnetic field manipulation with gas-phase hydrogelation, we were able to arrest the hydrogel structure, preserving the nanofibers' spatial and temporal orientation. This system enables the creation of on-demand optical patterns, which we demonstrate through selective light transmission and reflection, offering potential for applications in information coding, storage, and encryption.
