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Title: Influence of drying method on the surface energy of cellulose nanofibrils determined by inverse gas chromatography

Source: Journal of Colloid And Interface Science, Volume 405, 2013; pp. 85-95.

Author(s)Peng, Yucheng; Gardner, Douglas J.; Han, Yousoo; Cai, Zhiyong; Tshabalala, Mandla A.

Publication Year: 2013  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-1B  FPL-4707-3B

Abstract: Research and development of the renewable nanomaterial cellulose nanofibrils (CNFs) has received considerable attention. The effect of drying on the surface energy of CNFs was investigated. Samples of nanofibrillated cellulose (NFC) and cellulose nanocrystals (CNC) were each subjected to four separate drying methods: air-drying, freeze-drying, spray-drying, and supercritical-drying. The surface morphology of the dried CNFs was examined using a scanning electron microscope. The surface energy of the dried CNFs was determined using inverse gas chromatography at infinite dilution and column temperatures: 30, 40, 50, 55, and 60°C. Surface energy measurements of supercritical-dried NFCs were performed also at column temperatures: 70, 75, and 80°C. Different drying methods produced CNFs with different morphologies which in turn significantly influenced their surface energy. Supercritical-drying resulted in NFCs having a dispersion component of surface energy of 98.3 ± 5.8 mJ/m2 at 30°C. The dispersion component of surface energy of freeze-dried NFCs (44.3 ± 0.4 mJ/m2 at 30°C) and CNCs (46.5 ± 0.9 mJ/m2 at 30°C) were the lowest among all the CNFs. The pre-freezing treatment during the freeze-drying process is hypothesized to have a major impact on the dispersion component of surface energy of the CNFs. The acid and base parameters of all the dried CNFs were amphoteric (acidic and basic) although predominantly basic in nature.

Keywords: Cellulose nanofibrils; Drying; Surface energy; Inverse gas chromatography

Publication Review Process: Formally Refereed

File size: 591 kb(s)

Date posted: 08/05/2013

This publication is also viewable on Treesearch:  view
RITS Product ID: 64601
Current FPL Scientists associated with this product (listed alphabetically)
Cai, Zhiyong
Supervisory Research Materials Engineer
Tshabalala, Mandla A.
Research Chemist

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