2025-04-08 京都大学
<関連情報>
- https://www.kyoto-u.ac.jp/ja/research-news/2025-04-08
- https://www.kyoto-u.ac.jp/sites/default/files/2025-04/web_2504_Kobayashi-fcfe874de5f7a86e689a9b4ec4357fa8.pdf
- https://pubs.acs.org/doi/10.1021/acs.nanolett.4c06483
制御された右ねじれ周期性を有するサステイナブルウッドナノセルロースの欠陥のない均一な単結晶分散体 Defectless and Uniform Single-Crystallite Dispersions of Sustainable Wood Nanocellulose with a Regulated Right-Handed Twist Periodicity
Tomoki Ito,Kazuho Daicho,Shuji Fujisawa,Tsuguyuki Saito,and Kayoko Kobayashi
Nano Letters Published:Published April 7, 2025
DOI:https://doi.org/10.1021/acs.nanolett.4c06483
Abstract
Controlling the quality of cellulose nanofibers (CNFs), such as dispersibility and defects, is crucial for fully exploiting sustainable wood-derived CNFs. The dispersibility of CNFs is now tailorable, whereas the defects are still uncontrollable. This study is the first to demonstrate defect suppression through the selection of raw material species and the chemical pretreatment for cellulose. Two raw materials of softwood pulp and holocellulose are chosen from the perspective of the nanoscale supramolecular structure of plant celluloses. These two materials are subjected to regioselective surface oxidation using 4-acetamido-2,2,6,6-tetramethylpiperidinyl-1-oxyl as a catalyst at two different pHs to prepare four types of CNFs. Through statistical analysis of the CNF morphology using atomic force microscopy (AFM) image processing, we found a process yielding defectless CNF dispersions comprising uniform single crystallite units of cellulose. Wavelet transform analysis of AFM height profiles further revealed that the defectless CNFs exhibit regulated twist periodicity along much of their length.
