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Preparation and characterization of cellulose acetate membranes with TEMPO-oxidized cellulose nanofibrils containing alkyl ammonium carboxylates
Kyoto Institute of Technology, Japan.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
University of Tsukuba, Japan.
2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Cellulose acetate (CA) membranes have been widely used for water purification owing to several advantages, e.g., biocompatibility and low fouling rate. However, they suffer from a lower water flux compared to the other polymeric membranes. Therefore, in this study, CA membranes were blended with 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (T-CNFs) containing quaternary alkyl ammonium (QA) carboxylates to improve their water flux. When increasing the alkyl chain length of the QAs, the positron lifetime and intensity of the CA membranes increased and decreased respectively, as revealed via positron annihilation lifetime spectroscopy. This indicated that the CA membranes had larger and fewer pores when using the T-CNFs containing QAs with longer alkyl chains. The pure water flux of these membranes also increased with the alkyl chain lengths of QAs although their rejection rate (Rj) decreased accordingly. However, they revealed a potentiality to be used as ultrafiltration membranes, allowing a 99% Rj for albumin. The tensile strength, strain to failure, and work of fracture of the CA membranes increased when blended with T-CNFs. Force measurements using the AFM colloidal probe technique showed that the adhesion between the membrane constituents depends on their surface chemistry. This indicated that the structural differences observed among the blended membranes may be due to the affinity between CA and T-CNF containing QAs with different alkyl chain lengths. This study demonstrates that the properties of CA membranes can be tailored by the addition of T-CNFs with different surface chemistries.

Place, publisher, year, edition, pages
Springer , 2019.
Keywords [en]
AFM, Cellulose acetate membrane, Cellulose nanofibril, Colloidal probe force measurement, Counter-ion, Biocompatibility, Carboxylation, Cellulose, Chain length, Colloids, Force measurement, Nanofibers, Positron annihilation spectroscopy, Positrons, Probes, Surface chemistry, Tensile strength, Colloidal probe techniques, Colloidal probes, Counterions, Nanofibril, Positron annihilation lifetime spectroscopy, Structural differences, Ultra-filtration membranes, Membranes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40929DOI: 10.1007/s10570-019-02872-5Scopus ID: 2-s2.0-85075322009OAI: oai:DiVA.org:ri-40929DiVA, id: diva2:1376734
Note

 Funding details: Iwatani Naoji Foundation; Funding details: Futaba Electronics Memorial Foundation; Funding details: Ogasawara Foundation for the Promotion of Science and Engineering; Funding details: Izumi Science and Technology Foundation; Funding details: Japan Society for the Promotion of Science, JSPS; Funding details: Yazaki Memorial Foundation for Science and Technology; Funding text 1: This research was supported by Grants-in-Aid for Scientific Research (16H06912, 18K14502) from the Japan Society for the Promotion of Science and the Research Grant Program from Izumi Science and Technology Foundation, Iwatani Naoji Foundation, Futaba Electronics Memorial Foundation, Yazaki Memorial Foundation for Science and Technology, Research Institute for Production Development, and Ogasawara Foundation for the Promotion of Science & Engineering, Japan.

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved

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