Chitin nanofibrils (NCh, ∼10 nm lateral size) were produced under conditions that less severe compared to those for other biomass-derived nanomaterials and used formulate high internal phase Pickering emulsions (HIPPEs). Pre-emulsification followed by continuous oil feeding facilitated a "scaffold" with elasticity, which arrested droplet mobility coarsening, achieving edible oil-in-water volume fraction as 88%. The stabilization ability of rodlike NCh originated from the restricted breakage...

Understanding nanoscale moisture interactions is fundamental to most applications of wood, including cellulosic nanomaterials with tailored properties. By combining X-ray scattering experiments molecular simulations and taking advantage computed scattering, we studied the moisture-induced changes in cellulose microfibril bundles softwood secondary cell walls. Our models reproduced important experimentally observed diffraction peak locations widths gave new insights into their interpretation....

The origins of the unique properties natural fibres have remained largely unresolved because complex interrelations between structural hierarchy, chirality and bound water. In this paper, analysis melting endotherms for bleached hardwood pulps indicates that amount non-freezing water (0.21 g/g) is roughly half freezing (0.42 g/g). We link result to two smallest constitutive units, microfibrils their bundles, using molecular dynamics simulations at both hierarchical levels. layers found in...

We study the generation and decay of aqueous foams stabilized by sodium dodecyl sulfate (SDS) in presence unmodified cellulose nanofibrils (CNF). Together with rheology suspensions containing CNF SDS, interfacial/colloidal interactions are determined quartz crystal microgravimetry dissipation monitoring, surface plasmon resonance, isothermal titration calorimetry. The results used to explain properties air/water interface (interfacial activity dilatational moduli from oscillating air...

Abstract Novel lightweight cellulose fibre materials containing various strength enhancing polymeric and fibrillar components were formed with the help of foam technology. Increasing inter-fibre bond local material density was attempted unique lignin-containing wood fines (V-fines), microfibrils (CMF), TEMPO-oxidized nanofibrils (TCNF), macromolecules such as cationic starch, polyvinyl alcohol (PVA), locust bean gum (LBG). The investigated fibres included both long hemp bast northern...

In this work we challenge some earlier theoretical ideas on the strength of lightweight fiber materials by analyzing an extensive set foam-formed networks. The experimental samples included various different material densities and types natural regenerated cellulose fibers. Characterization was performed macroscopic mechanical testing, supported simultaneous high-speed imaging local deformations inside a network. showed extremely heterogeneous deformation behavior sample, with both rapidly...

Porous, transparent plant-based template constructed from cellulose nanofibrils acts as a versatile matrix for immobilization of H₂-producing cyanobacteria and green algae.

Abstract We have carried out atomistic molecular dynamics simulations to study the mechanical properties of cellulose nanofibrils in water and ethanol. The studied elementary fibrils consisted regions having 34 or 36 chains whose cross-sectional diameter across fibril was roughly 3.4 nm. models used included both crystalline non-crystalline regions, where latter were designed describe essentials parts amorphous nanofibrils. examined different numbers connecting between crystallites, found...

Cellulose fiber materials suitable for filtering, insulation, protective, and hygiene applications can be formed using aqueous foam as a carrier phase. The subtle fiber–bubble interaction provides tool which utilized to alter both structural mechanical material properties. Earlier model surface studies have only indicated clear surface-bubble adhesion when the hydrophobicity tension of solution are high enough. In this work, we first show that silica surfaces these basic mechanisms similar...

Abstract Foam forming leads to sheet structures with exceptional volume of large pores. The link between fibre network structure and foam properties is investigated by comparing pore measured bubble-size distribution. In foams produced mechanical mixing, higher rotor speed smaller average bubble size, whereas the effects coming from air content surfactant are non-systematic. A significant drop in size seen when mixing fibres foam. sheets made forming, there more pores compared water formed...

To better understand the complex system of wet foams in presence cellulosic fibers, we investigate bubble-surface interactions by following effects surface hydrophobicity and tension on contact angle captive bubbles. Bubbles are brought into with model silica cellulose surfaces immersed solutions a foaming surfactant (sodium dodecyl sulfate) different concentrations. It is observed that bubble attachment controlled wetting, but significant scatter behavior occurs near transition from partial...

Broader use of bio-based fibres in packaging becomes possible when the mechanical properties fibre materials exceed those conventional paperboard. Hot-pressing provides an efficient method to improve both wet and dry strength lignin-containing paper webs. Here we study varied pressing conditions for webs formed with thermomechanical pulp (TMP). The results are compared against similar data a wide range other types. In addition standard structural measurements, characterise induced changes...

Abstract To avoid microplastic pollution, there is an urgent need to replace fossil-based cushioning materials in packaging with easily recyclable alternatives. Here, we investigated the potential of lightweight cellulose fibre as a solution for mechanical protection. The quasi-static compression was studied among vast set 129 different foam-formed trial points material density ranging from 21 kg/m 3 123 . included two types, bleached softwood kraft pulp (BSKP) and chemithermomechanical...

The localized eigenstates of the Harper equation exhibit universal self-similar fluctuations once exponentially decaying part wave function is factorized out. For a fixed quantum state, we show that whole phase characterized by single strong coupling point renormalization equations. This also describes generalized model with next nearest neighbor interaction below certain threshold. Above threshold, in are described strange invariant set

Foam technology enables the preparation of new fiber-based materials with reduced density and improved mechanical performances. By utilizing multi-scale structural features formed fiber network, it is possible to enhance elasticity lightweight cellulose under compressive loads. Sufficient strength achieved by optimally combining fibers fines different length-scales. Elasticity adding polymers that accumulate at joints, which help network structure recover after compression. This concept was...