Cellulosic honeycomb films

Xu, W.Z., Zhang, X., Kadla, J.F. Design of functionalized cellulosic honeycomb films site-specific biomolecule modification via click chemistry . Biomacromolecules 13, 350-357... 

Hemandez-Guerrero M, Davis TP, Bamer-Kowollik C, Stenzel MH (2005) Polyst5 rene comb polymers built on cellulose or poly(styrene-co-2-hydroxyethyhnethacrylate) backbones as substrates for the preparation of structured honeycomb films. Eur Polym J 41 2264—2277... 

We can also mention the use of bio-sourced building blocks based on cellulose or dextran. Kadla et al. described value-added materials from naturally abundant polymers for system that may serve as a platform for the design and development of biosensors [197]. A hierarchically strucmred honeycomb film from dextran-ft-PS amphiphilic linear diblock copolymers has also been described by Chen et al. leading to ordered porous bio-hybrid films. [198] Honeycomb patterned surfaces functionalized with biomolecules for specific recognition of proteins or bacteria have been also achieved either by self-assembly of amphiphilic copolymers based on galactose moieties [155] or by post-modification with peptide sequences [199]. 

Recently, a honeycomb-patterned cellulose triacetate film was successfully fabricated by casting of water-in-oil (W/0) emulsion on the substrate, and the subsequent deacetylation yielded a honeycomb-patterned cellulose film without deformation as shown in Figure 16-13 (Kasai and Kondo 2004). In the film forming process, when cellulose triacetate started to be precipitated as a honeycomb-patterned film, the honeycomb frames were supposed to be simultaneously stretched by natural drying of water droplets as a mold. This stretching effect of natural dry presumably resulted in an alignment of cellulose molecular chains along the honeycomb frames, similarly to formation of NOC-typed form (Kasai et al., unpublished). 

Kasai, W., Kondo, T. Eabrication of honeycomb-patterned cellulose films. Macromol. Biosci. 4, 17-21 (2004)... 

Figure 16-13. Light micrograph of honeycomb-patterned cellulose films from cellulose triacetate together with the surface topographic AFM image. (Scale bars are 50 (xm.)...

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