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Directional Freezing of Nanocellulose Dispersions Aligns the Rod-Like Particles and Produces Low-Density and Robust Particle Networks
Stockholm University, Sweden; MIT, Sweden; Institute of Soldiers Nanotechnologies, USA.ORCID-id: 0000-0002-9816-5270
2016 (Engelska)Ingår i: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 17, nr 5, s. 1875-1881Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We show that unidirectional freezing of nanocellulose dispersions produces cellular foams with high alignment of the rod-like nanoparticles in the freezing direction. Quantification of the alignment in the long direction of the tubular pores with X-ray diffraction shows high orientation of cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC) at particle concentrations above 0.2 wt % (CNC) and 0.08 wt % (CNF). Aggregation of CNF by pH decrease or addition of salt significantly reduces the particle orientation; in contrast, exceeding the concentration where particles gel by mobility constraints had a relatively small effect on the orientation. The dense nanocellulose network formed by directional freezing was sufficiently strong to resist melting. The formed hydrogels were birefringent and displayed anisotropic laser diffraction patterns, suggesting preserved nanocellulose alignment and cellular structure. Nondirectional freezing of the hydrogels followed by sublimation generates foams with a pore structure and nanocellulose alignment resembling the structure of the initial directional freezing. 

Ort, förlag, år, upplaga, sidor
American Chemical Society , 2016. Vol. 17, nr 5, s. 1875-1881
Nyckelord [en]
Alignment; Dispersions; Freezing; Hydrogels; X ray diffraction, Cellular structure; Cellulose nanocrystal (CNC); Cellulose nanofibrils; Directional freezing; Mobility constraints; Particle concentrations; Particle orientation; Rod-like particles, Cellulose, cellulose; cellulose nanocrystal; cellulose nanofibril; nanocrystal; unclassified drug; cellulose; hydrogel; nanofiber; nanoparticle, anisotropy; Article; birefringence; dispersion; freezing; hydrogel; laser diffraction; melting point; particle size; pH; priority journal; X ray diffraction; chemistry; freezing; surface property, Cellulose Derivatives; Concentration; Fiber Orientation; Foam; Freezing; Melting, Anisotropy; Cellulose; Freezing; Hydrogels; Nanofibers; Nanoparticles; Particle Size; Surface Properties; X-Ray Diffraction
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Materialteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-68235DOI: 10.1021/acs.biomac.6b00304Scopus ID: 2-s2.0-84973644332OAI: oai:DiVA.org:ri-68235DiVA, id: diva2:1817431
Tillgänglig från: 2023-12-06 Skapad: 2023-12-06 Senast uppdaterad: 2023-12-06Bibliografiskt granskad

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