Films made of cellulose nanofibrils: surface modification by adsorption of a cationic surfactant and characterization by computer-assisted electron microscopy |
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| Authors: | K Syverud K Xhanari G Chinga-Carrasco Y Yu P Stenius |
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| Institution: | 1.Paper and Fibre Research Institute (PFI AS),Trondheim,Norway;2.Ugelstad Laboratory,Norwegian University of Science and Technology (NTNU),Trondheim,Norway;3.Department of Materials Science and Engineering,Norwegian University of Science and Technology (NTNU),Trondheim,Norway |
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| Abstract: | Films made of nanofibrils were modified by adsorption of a cationic surfactant directly on the film surfaces. The nanofibrils
were prepared by 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxidation and mechanical fibrillation, and were relatively
homogeneous in size. The average nanofibril diameter and surface porosity was quantified based on computer-assisted field-emission
scanning electron microscopy (FE-SEM). The cationic surfactant used in the adsorption was n-hexadecyl trimethylammonium bromide (cetyltrimethylammonium bromide, CTAB). The adsorption of CTAB was confirmed by Fourier
transform infrared (FTIR) spectroscopy and high-resolution transmission electron microscopy (HRTEM) analyses. It was shown
that the adsorbed layer of CTAB increased the hydrophobicity, without affecting the tensile index significantly. This capability,
combined with the antiseptic properties of CTAB, may be a major advantage for several applications. |
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