Pingrey Benjamin, Ede James D, Sayes Christie M, Shatkin Jo Anne, Stark Nicole, Hsieh You-Lo
Biological and Agricultural Engineering, Chemical Engineering, University of California at Davis Davis CA 95616-8722 USA
Vireo Advisors, LLC PO Box 51368 Boston MA 02130 USA.
RSC Adv. 2024 Mar 25;14(14):9860-9868. doi: 10.1039/d4ra00424h. eCollection 2024 Mar 20.
Amphiphilic sulfated cellulose nanofibrils were synthesized with yields in excess of 99% by sulfation of dissolving pulp cellulose using chlorosulfonic acid in anhydrous ,-dimethyl formamide followed by high-speed blending. The sulfation level was stoichiometrically tunable to between 1.48 and 2.23 mmol g. The optimized SCNF demonstrated the ability to act as an effective dispersant for graphene produced exfoliation in aqueous media, allowing for the production of aqueous stabilized graphene with 3.9 ± 0.3 wt% graphite to graphene conversion and suspended solids comprised of 19.5 ± 1.5 wt% graphene. Graphene exfoliated with SCNF was observed to consist exclusively of mono- and bilayers, with 42% of sheets being monolayer. Furthermore, it was demonstrated that SCNF defibrillation and graphene exfoliation could be combined into a single one-pot process.
通过在无水N，N-二甲基甲酰胺中用氯磺酸对溶解浆纤维素进行硫酸化，然后进行高速共混，合成了两亲性硫酸化纤维素纳米原纤，产率超过99%。硫酸化水平在化学计量上可调节至1.48至2.23 mmol/g之间。优化后的硫酸化纤维素纳米原纤（SCNF）表现出能够作为一种有效的分散剂，用于在水性介质中使石墨烯产生剥落，从而能够制备出具有3.9±0.3 wt%石墨到石墨烯转化率且悬浮固体由19.5±1.5 wt%石墨烯组成的水性稳定石墨烯。观察到用SCNF剥落的石墨烯仅由单层和双层组成，其中42%的片层为单层。此外，还证明了SCNF的解纤和石墨烯的剥落可以合并为一个单步一锅法工艺。
