High resolution self-assembled patterns on flexible nanocellulose film

Marie Gestranius, I. Otsuka, S. Halila, R. Borsali, Tekla Tammelin

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific


    The demand for bionanomaterial architectures to be used in next generation material solns. e.g. in optoelectronics, biosensors and nanoporous membranes is intense and topical. Besides the requirements deriving from the high-resoln. nanoarchitecture, materials should possess several beneficial features such as flexibility, transparency and strength. Here we present an elegant bottom-up approach where a carbohydrate-based diblock copolymer, polystyrene-bmaltoheptaose (PS-b-MH) is organized on a flexible self-standing film of cellulose nanofibrils (CNF) via effortless selfassembly. During solvent annealing the PS-b-MH undergoes spontaneous rearrangement into high-resoln. patterns. AFM imaging revealed that the domains formed by PS-b-MH are in the range of 10-15 nm. It is remarkable to find that they were able to self-assemble directly on CNF films with a surface roughness of 100-400 nm which is a significantly higher unit distance compared to the dimension of the domain unit of the block copolymer. The pattern resoln. of the horizontal assemblies is comparable to the patterns detected on smooth and inert surfaces. Interestingly, patterns seem to follow the macroscale topog. features of the nanocellulose film. The ideal conditions for block copolymer selfassembly require weak surface interactions between the block copolymer and the substrate, in order to increase the chain mobility and enable rearrangements of the block copolymer to take place during annealing. This is exactly how our carbohydrate-based diblock copolymer system behaves. The adsorption of PS-b-MH on CNF surfaces monitored by QCM-D revealed weak interactions between CNF and PS-b-MH, and the formed PS-b-MH layer was soft and mobile. The use of plant-derived carbohydrates as building blocks to create complex structures is a recognizable nanotechnol. that will enable the bioeconomy transition.
    Original languageEnglish
    Title of host publicationAbstracts of Papers, 257th ACS National Meeting & Exposition, Orlando, FL, United States, Mar. 31-Apr. 4, 2019
    PublisherAmerican Chemical Society ACS
    Publication statusPublished - Apr 2019
    MoE publication typeNot Eligible
    Event257th ACS National Meeting & Exposition - Orlando, United States
    Duration: 31 Mar 20194 Apr 2019

    Publication series

    SeriesAbstracts of Papers: The American Chemical Society


    Conference257th ACS National Meeting & Exposition
    Country/TerritoryUnited States


    Dive into the research topics of 'High resolution self-assembled patterns on flexible nanocellulose film'. Together they form a unique fingerprint.

    Cite this