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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"cellulose nanocrystal"”.
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Large area cellulose nanocrystal self-assembly: towards sustainable pigments
… striking colours in plants are obtained using cellulose nanofibrils organised in helicoidal architectures. Interestingly, similar helicoidal architectures with analogous optical response can be obtained in vitro by self-assembly of cellulose nanocrystals (CNCs). CNCs are rod-like colloids …
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Structure-Process-Property Relationships of Cellulose Nanocrystal Thermoplastic Urethane Composites
… nanotubes, graphene, silica, nanoclays, and cellulose nanocrystals. The literature presented herein aims to investigate structure-process-property relationships of cellulose nanocrystal (CNC) polymer composites. These CNC nanocomposites are unique in that they provide a dynamic mechanical …
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Generation of Titanium Dioxide Parts using Cellulose Nanocrystal Aerogel Hard Templates
… structured titanium dioxide (TiO2) using cellulose nanocrystal (CNC) aerogel hard templates for photocatalytic and biomaterial applications. Suspensions of CNCs in water varying in solid loading from 20 mg/mL to 100 mg/mL were prepared and frozen at three different temperatures (-20 °C, …
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4D-Printing with Cellulose Nanocrystal Thermoplastic Nanocomposites: Mechanical Adaptivity and Thermal Influence
… with fused filament fabrication (FFF) of cellulose nanocrystal (CNC) and thermoplastic polyurethane (TPU) nanocomposites, focusing on preliminary optimization of a processing window for 3D printing of mechanically responsive composites and the influence of temperature on mechanical …
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Functionalized High Aspect Ratio Cellulose Nanocrystal Filled Composites for Gas and Liquid Separations
… the impact of incorporation of high aspect ratio cellulose nanocrystals (CNCs) on the performance of the resulting polymer composite membranes for desalination and gas phase separations. Lack of available drinking water is an increasing problem across the world with much of the world living in …
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Bioactive Cellulose Nanocrystal Reinforced 3D Printable Poly(epsilon-caprolactone) Nanocomposite for Bone Tissue Engineering
… This research investigates the potential use of cellulose nanocrystals (CNCs) as multi-functional additives that enhance the mechanical properties and increase the biomineralization rate of PCL. To this end, an in vitro biomineralization study of both sulfuric acid hydrolyzed-CNCs (SH-CNCs) and …
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Chitosan-Cellulose Nanocrystal Polyelectrolyte Complex Particles: Preparation, Characterization, and In Vitro Drug Release Properties
… permeability-enhancing polysaccharide, and cellulose nanocrystals, rod-like cellulose nanoparticles with sulfate groups on their surface, have potential applications in oral drug delivery. The purpose of this research was to develop an understanding of the formation and properties of …
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Fabrication and characterization of cellulose nanocrystal enhanced sustainable polymer nanocomposites through surface chemistry and processing
<p>Cellulose nanocrystals (CNCs) belong to a class of cellulose based nanomaterials that are extracted from renewable and sustainable sources and have excellent mechanical and thermal properties. While applications for CNCs have been expanding, one of the challenges of utilizing CNCs is to overcome …
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Effects of acid hydrolysis conditions on cellulose nanocrystal yield and properties: A response surface methodology study
Cellulose nanocrystals (CNCs) are frequently prepared by sulfuric acid hydrolysis of a purified cellulose starting material. CNC yields, however, are generally low, often below 20%. This study employs response surface methodology to optimize the hydrolysis conditions for maximum CNC yield. Two …
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Biomimetic Extracellular Matrices for In Vitro Cancer Models and Tissue Engineering Platforms
… characterization of cells. Using a suspension of cellulose nanocrystals functionalized with temperature-responsive polymer molecules, a filamentous hydrogel was formed at 37 degrees Celsius that supported the growth of cancer spheroids. Upon hydrogel cooling to room temperature, on-demand release …
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Structural Colour in Fruits
… technique for reflective self-assembled cellulose nanocrystal films is described, which mimics the morphology of Pollia cells by successfully introducing a curvature in the photonic multilayer whilst maintaining its optical response. Enhancement of the angular independence of light …
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Designing High Performing Durable Bio-Based Coatings for Packaging Applications
… using renewable biopolymers. These include cellulose, extracted from plants, and chitin, sourced from mushrooms and food waste like crustacean exoskeletons. These natural polymers can form strong, high-performance films but are limited by moisture sensitivity and brittleness. Through …
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Synthesis and characterisation of biobased polyamides and their cellulose nanocomposites
… properties of the resulting polyamide. <br/><br/>Cellulose nanocrystal (CNC) is considered an excellent candidate to reinforce biobased polyamides while maintaining the materials’ sustainability. CNC was isolated from microcrystalline cellulose by sulphuric acid hydrolysis. CNC was added to …
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Adsorption Studies of Polysaccharides and Phospholipids Onto Cellulose
Interactions between biomolecules and cellulose films at solid/liquid interfaces was studied by surface plasmon resonance spectroscopy (SPR), quartz crystal microbalance with dissipation monitoring (QCM-D) and in situ atomic force microscopy (AFM) measurements. This dissertation shows the porous …
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Studies of Interactions Between Rod-like Celulose Nanocrystals and Xylan and Pullulan Derivatives: A Light Scattering Study
… between polysaccharide derivatives and rod-like cellulose nanocrystals were studied by light scattering. Two replicates of cellulose nanocrystals (DOE-2-12A and DOE-2-12B) were probed with polarized and depolarized dynamic light scattering. X-ray photoelectron spectroscopy experiments showed …
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Process-Structure-Property Relationships of Cellulose Derivative/Thermoplastic Urethane Polymer Composites
Cellulose-reinforced thermoplastic composites have garnered significant attention as sustainable alternatives to conventional petroleum-based materials, offering advantages such as biodegradability, mechanical reinforcement, and tunable functionality. These composites hold immense potential for …
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Processing Approaches for Maintaining Multifunctionality in Advanced Thermoplastic Composites
… The material studied consists of a modified cellulose nanocrystal (CNC) with additional carboxylated "hairs" called electrosterically stabilized nanocellulose crystals (ENCC). By embedding these particles in a thermoplastic polyurethane (TPU) matrix, a stimulated optical response is …
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Nanocomposites: Incorporation of Cellulose Nanocrystals into Polymers and Addition of Zwitterionic Functionality
Cellulose nanocrystals (CNCs) are nanomaterials that have shown promise as reinforcement filler materials. Their small size, high modulus, and high aspect ratio makes CNCs good reinforcing materials. CNCs are typically introduced into softer polymer materials, which can have incompatible surface …
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The confined self-assembly of photonic pigments: from synthetic polymer brushes to sustainable cellulosic colloids
… coloured materials. The first system uses cellulose nanocrystals (CNCs), extracted from wood or cotton, which can self-organise as a cholesteric liquid crystal phase to form a helicoidal nano-architecture that reflects the visible light. CNCs are sustainable and biocompatible, but these …
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