Department of Bioproducts and Biosystems, Aalto University, P.O.Box 16300, Aalto, FI-00076, Finland.
Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, 13083-970, Brazil.
Macromol Rapid Commun. 2021 Jun;42(12):e2100092. doi: 10.1002/marc.202100092. Epub 2021 May 6.
Nanoparticle assembly is intensely surveyed because of the numerous applications within fields such as catalysis, batteries, and biomedicine. Here, directed assembly of rod-like, biologically derived cellulose nanocrystals (CNCs) within the template of a processed cotton fiber cell wall, that is, the native origin of CNCs, is reported. It is a system where the assembly takes place in solid state simultaneously with the top-down formation of the CNCs via hydrolysis with HCl vapor. Upon hydrolysis, cellulose microfibrils in the fiber break down to CNCs that then pack together, resulting in reduced pore size distribution of the original fiber. The denser packing is demonstrated by N adsorption, water uptake, thermoporometry, and small-angle X-ray scattering, and hypothetically assigned to attractive van der Waals interactions between the CNCs.
由于在催化、电池和生物医学等领域的众多应用，纳米颗粒组装受到了广泛关注。在这里，报告了在经过处理的棉纤维细胞壁模板内，即 CNCs 的天然起源处，棒状生物衍生纤维素纳米晶体（CNCs）的定向组装。这是一个在通过 HCl 蒸汽水解同时进行固相反响的自上而下形成 CNCs 的系统。水解时，纤维中的纤维素微纤维分解成 CNCs，然后这些 CNCs 聚集在一起，导致原始纤维的孔径分布减小。更密集的堆积通过氮气吸附、吸水率、热压法和小角 X 射线散射进行了证明，并假设归因于 CNCs 之间的吸引力范德华相互作用。
