Journal ArticleDOI
Chiral nematic suspensions of cellulose crystallites; phase separation and magnetic field orientation
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The critical volume fraction for phase separation of salt-free suspensions is typically 0.03, with a relatively narrow biphasic region as discussed by the authors, and the ordered phase becomes oriented in a magnetic field with its chiral nematic axis parallel to the applied field.Abstract:
Suspensions of rod-like cellulose crystallites of axial ratio ≈ 20–40, prepared by acid hydrolysis of natural cellulose fibres with sulphuric acid, give stable ordered fluids that display well-formed textures and disclinations characteristic of chiral nematic liquid crystalline phases. The critical volume fraction for phase separation of salt-free suspensions is typically 0.03, with a relatively narrow biphasic region. Because of the negative diamagnetic susceptibility of cellulose, the ordered phase becomes oriented in a magnetic field with its chiral nematic axis parallel to the applied field.read more
Citations
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Cellulose nanocrystals: chemistry, self-assembly, and applications.
TL;DR: Dr. Youssef Habibi’s research interests include the sustainable production of materials from biomass, development of high performance nanocomposites from lignocellulosic materials, biomass conversion technologies, and the application of novel analytical tools in biomass research.
Journal ArticleDOI
Nanocelluloses: A New Family of Nature-Based Materials
D. Klemm,Friederike Kramer,Sebastian Moritz,Tom Lindström,Mikael Ankerfors,Derek G. Gray,Annie Dorris +6 more
TL;DR: 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.
Journal ArticleDOI
Review of Recent Research into Cellulosic Whiskers, Their Properties and Their Application in Nanocomposite Field
TL;DR: There are numerous examples where animals or plants synthesize extracellular high-performance skeletal biocomposites consisting of a matrix reinforced by fibrous biopolymers, which occur as whisker-like microfibrils that are biosynthesized and deposited in a continuous fashion.
Journal ArticleDOI
Microfibrillated cellulose - its barrier properties and applications in cellulosic materials: a review.
TL;DR: It is proposed to focus on the barrier properties of MFC used in films, in nanocomposites, or in paper coating to reduce the high energy consumption and produce new types of M FC materials on an industrial scale.
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Effect of reaction conditions on the properties and behavior of wood cellulose nanocrystal suspensions.
TL;DR: Increased acid-to-pulp ratio reduced the dimensions of the nanocrystals thus produced and the critical concentration was increased and the biphasic range became narrower; a suspension made from a bleached kraft eucalyptus pulp gave very similar properties to the softwood nanocrystal suspension when prepared under similar hydrolysis conditions.
References
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Journal ArticleDOI
The effects of shape on the interaction of colloidal particles
TL;DR: In this article, it was shown that colloids in general are apt to exhibit considerable deviations from Raoult's law and that crystalline phases retaining a fair proportion of solvent may separate from concentrated solutions.
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Helicoidal self-ordering of cellulose microfibrils in aqueous suspension.
TL;DR: An in vitro system that attracts by its simplicity, where above a critical concentration the colloidal dispersion separates spontaneously into a chiral nematic liquid crystalline phase and solidifies into regularly twisted fibrillar layers that mimic the structural organization of helicoids in nature.
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Twisted fibrous arrangements in biological materials and cholesteric mesophases.
TL;DR: A comparison is made between certain fibrous and regularly twisted biological materials and certain ordered liquids commonly called 'esteric liquid crystals' and examples of twisted arrangements and typical textures of cholesteric mesophases.