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    Author(s): Yucheng Peng; Douglas J. Gardner; Yousoo Han; Zhiyong CaiMandla A. Tshabalala
    Date: 2013
    Source: Journal of Colloid And Interface Science, Volume 405, 2013; pp. 85-95.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: View PDF  (591.24 KB)

    Description

    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.

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    Citation

    Peng, Yucheng; Gardner, Douglas J.; Han, Yousoo; Cai, Zhiyong; Tshabalala, Mandla A. 2013. Influence of drying method on the surface energy of cellulose nanofibrils determined by inverse gas chromatography. Journal of Colloid and Interface Science. 405: 85-95.

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    Keywords

    Cellulose nanofibrils, Drying, Surface energy, Inverse gas chromatography

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