Nanochitins of Varying Aspect Ratio and Properties of Microfibers Produced by Interfacial Complexation with Seaweed Alginate

dc.contributorAalto Universityen
dc.contributor.authorGrande, Rafaelen_US
dc.contributor.authorBai, Longen_US
dc.contributor.authorWang, Lingen_US
dc.contributor.authorXiang, Wenchaoen_US
dc.contributor.authorIkkala, Ollien_US
dc.contributor.authorCarvalho, Antonio J.F.en_US
dc.contributor.authorRojas, Orlando J.en_US
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorBio-based Colloids and Materialsen
dc.contributor.groupauthorBiohybrid Materialsen
dc.contributor.groupauthorMolecular Materialsen
dc.contributor.organizationUniversidade de São Pauloen_US
dc.description| openaire: EC/H2020/788489/EU//BioELCell | openaire: EC/H2020/742829/EU//DRIVEN
dc.description.abstractWe introduce chitin nanofibers, nanochitin (ChNF), the cationic groups of which electrostatically complex in aqueous media with the anionic groups of a polyanion, seaweed alginate (SA). This allows the formation of continuous microfibers after drawing contacting suspensions. We elucidate the effect of the nanofiber aspect ratio (15, 25, and >60) on the mechanical performance of the composite microfibers after considering variables such as concentration, pH, and drawing rate. An automatic collector facilitated a constant spinning velocity of 30 mm/s upon interfacial complexation from aqueous media (using 0.3 to 1 wt % as mass fraction for each component and a pH between 4 and 7). The composite microfibers showed a core-shell structure in which ChNFs were preferentially axially aligned in the center and more randomly oriented in the shell. The degree of ChNF alignment in the core increased with the aspect ratio, as resolved by WAXS diffractograms. Consequently, ChNF with the largest aspect ratio (>60) was readily spun into microfibers that displayed the highest Young's modulus (4.5 GPa), almost double that measured for the shortest ChNF. The latter, however, presented the highest strain and flexibility and allowed continuous fiber spinning. Distinctively, tensile tests revealed mechanically stable microfibers even in wet conditions, with a strength loss of less than 50% and strain gains of up to 35%. The amino and carboxyl groups in the microfibers offer possibilities for functionalization, expanding their potential beyond that related to wound healing and antibacterial applications. Overall, we provide a new perspective toward dry spinning via interfacial complexation of biobased components and the effect of a particle's morphology on the detailed structuring of microfibers, which display a particular assembly that is discussed here for the first time.en
dc.description.versionPeer revieweden
dc.identifier.citationGrande, R, Bai, L, Wang, L, Xiang, W, Ikkala, O, Carvalho, A J F & Rojas, O J 2020, ' Nanochitins of Varying Aspect Ratio and Properties of Microfibers Produced by Interfacial Complexation with Seaweed Alginate ', ACS Sustainable Chemistry and Engineering, vol. 8, no. 2, pp. 1137-1145 .
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dc.relation.ispartofseriesACS Sustainable Chemistry and Engineeringen
dc.relation.ispartofseriesVolume 8, issue 2en
dc.subject.keywordchitin nanofibersen_US
dc.subject.keyworddry spinningen_US
dc.subject.keywordfiber spinningen_US
dc.subject.keywordinterfacial complexationen_US
dc.subject.keywordnanoparticle aspect ratioen_US
dc.subject.keywordsodium alginateen_US
dc.titleNanochitins of Varying Aspect Ratio and Properties of Microfibers Produced by Interfacial Complexation with Seaweed Alginateen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi