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Characterization of Ultrathin Films of Cellulose Esters

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Abstract

The adsorption of cellulose acetate (CA), cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB) from solutions prepared in acetone onto silicon wafers led to ultrathin films, which were characterized by ellipsometry, atomic force microscopy (AFM) and contact angle measurements. The polysaccharides films were characterized in the air just after their formation and after annealing at temperatures higher than their glass transition temperature or melt temperature. The films thickness close to 2 nm and surface roughness did not vary significantly upon annealing. AFM images revealed the presence of small clumps dispersed on a homogeneous layer, which covered completely the Si wafers. Such topographic details were also observed after annealing. However, upon annealing the films surfaces changed from hydrophilic to hydrophobic, evidencing molecular re-orientation at the solid–air interface. The adhesion of bovine serum albumin (BSA) and lipase onto the cellulose esters films was quantified in order to evaluate the possibility of applying such films as selective support for biomolecules.

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Authors and Affiliations

  1. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-900, São Paulo, S.P., Brazil

    P.M. Kosaka, Y. Kawano & D.F.S. Petri

  2. Instituto de Física, Universidade de São Paulo, P.O.Box 66318, 05315-970, São Paulo, S.P., Brazil

    M.C. Salvadori

Authors
  1. P.M. Kosaka
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  2. Y. Kawano
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  3. M.C. Salvadori
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  4. D.F.S. Petri
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Correspondence to D.F.S. Petri.

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Kosaka, P., Kawano, Y., Salvadori, M. et al. Characterization of Ultrathin Films of Cellulose Esters. Cellulose 12, 351–359 (2005). https://doi.org/10.1007/s10570-005-2205-0

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  • DOI: https://doi.org/10.1007/s10570-005-2205-0

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