Nanocellulose Fragmentation Mechanisms and Inversion of Chirality from the Single Particle to the Cholesteric Phase.

@article{Nystrm2017NanocelluloseFM,
  title={Nanocellulose Fragmentation Mechanisms and Inversion of Chirality from the Single Particle to the Cholesteric Phase.},
  author={Gustav Nystr{\"o}m and Mario Arcari and Jozef Adamcik and Ivan Usov and Raffaele Mezzenga},
  journal={ACS nano},
  year={2017},
  volume={12 6},
  pages={
          5141-5148
        }
}
Understanding how nanostructure and nanomechanics influence physical material properties on the micro- and macroscale is an essential goal in soft condensed matter research. Mechanisms governing fragmentation and chirality inversion of filamentous colloids are of specific interest because of their critical role in load-bearing and self-organizing functionalities of soft nanomaterials. Here we provide a fundamental insight into the self-organization across several length scales of nanocellulose… 

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References

SHOWING 1-10 OF 39 REFERENCES

Understanding nanocellulose chirality and structure–properties relationship at the single fibril level

Evidence of right-handed chirality is observed on both bundles and on single fibrils, and statistical analysis of contours from microscopy images shows a non-Gaussian kink angle distribution, which is inconsistent with a structure consisting of alternating amorphous and crystalline domains along the contour.

Colloidal cholesteric liquid crystal in spherical confinement

This work reports the organization of cholesteric liquid crystal formed by nanorods in spherical droplets and advances the understanding of how the interplay of order, confinement and topological defects affects the morphology of soft matter.

Hierarchical Propagation of Chirality through Reversible Polymerization: The Cholesteric Phase of DNA Oligomers

Unveiling the subtle rules that control the buildup of macroscopic chirality starting from chiral molecular elements is a challenge for theory and computations. In this context, a remarkable

Hierarchical Self-Assembly of Cellulose Nanocrystals in a Confined Geometry

The developed methodology allows us to fabricate truly hierarchical solid-state architectures from the nanometer to the macroscopic scale using a renewable and sustainable biopolymer.

Confinement-induced liquid crystalline transitions in amyloid fibril cholesteric tactoids

The discovery of cholesteric phases in amyloids is reported, using β-lactoglobulin fibrils shortened by shear stresses, with confinement-induced transitions from an ordered to an ordered state.

Structure and transformation of tactoids in cellulose nanocrystal suspensions

These insights into the early nucleation events of cellulose nanocrystals give important information about the growth of cholesteric liquid crystalline phases, especially for cellulose Nanocrystals, and are crucial for preparing photonics-quality films.

Nanocelluloses: a new family of nature-based materials.

This Review assembles the current knowledge on the isolation of microfibrillated cellulose from wood and its application in nanocomposites; the preparation of nanocrystalline cellulose and its use as a reinforcing agent; and the biofabrication of bacterial nanocellulose, as well as its evaluation as a biomaterial for medical implants.

Free-standing mesoporous silica films with tunable chiral nematic structures

This work describes the development of a photonic mesoporous inorganic solid that is a cast of a chiral nematic liquid crystal formed from nanocrystalline cellulose, and is the first materials to combine mesoporosity with long-range chiral ordering that produces photonic properties.

Two-Dimensional Aggregation and Semidilute Ordering in Cellulose Nanocrystals.

A reversible ordering of the 2D aggregates under semidilute conditions indicates an early stage of liquid crystalline arrangement of the crystal aggregates, at concentrations below those assessed using birefringence or polarized optical microscopy.

An ultrastrong nanofibrillar biomaterial: the strength of single cellulose nanofibrils revealed via sonication-induced fragmentation.

The strength values estimated for the cellulose nanofibrils in the present study are comparable with those of commercially available multiwalled carbon nanotubes.