Abstract
Films with different numbers of layers have been built by alternating the adsorption of carboxymethyl cellulose (CMC) and chitosan (CHI) at different pH levels. The adsorption process was recorded by quartz crystal microbalance (QCM). The results showed that under all pH conditions considered, the growth of the films is nonlinear. The film construction performed at pH 4.0 (preferred assembly pH) with different numbers of bilayers (CMC/CHI as one bilayer) was also observed step by step by atomic force microscopy (AFM). Comparing the growth process from QCM with the surface morphological changes from AFM shows the existence of an inhomogeneous structure for the first nine bilayers, and, after a coalescence of islands, an increase in the number of bilayers was demonstrated. The possible growth mechanism was also evaluated.
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Acknowledgments
The authors gratefully acknowledge the financial support of the Science Foundation of Henan Province (2011B430023) and the Scientific and Technological Projects of Henan Province (111100531717, 102101210100). The authors are particularly grateful to Margaret S. Cumberland for her help checking and amending the language.
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Zhang, S., Liu, W., Liang, J. et al. Buildup mechanism of carboxymethyl cellulose and chitosan self-assembled films. Cellulose 20, 1135–1143 (2013). https://doi.org/10.1007/s10570-013-9895-5
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DOI: https://doi.org/10.1007/s10570-013-9895-5