Designing Cellulose Nanofibrils for Stabilization of Fluid Interfaces.

  title={Designing Cellulose Nanofibrils for Stabilization of Fluid Interfaces.},
  author={Pascal Bertsch and Mario Arcari and Thomas Geue and Raffaele Mezzenga and Gustav Nystr{\"o}m and Peter Fischer},
Particles of biological origin are of increasing interest for the Pickering stabilization of biocompatible and environmentally friendly foams and emulsions. Cellulose nanofibrils (CNFs) are readily employed in that respect, however, the underlying mechanisms of interfacial stabilization remain widely unknown. For instance, it has not been resolved why CNFs are unable to stabilize foams while efficiently stabilizing emulsions. Here, we produce CNFs with varying contour length and charge density… 

Adsorption and interfacial structure of nanocelluloses at fluid interfaces.

Pickering Emulsions via Interfacial Nanoparticle Complexation of Oppositely Charged Nanopolysaccharides.

CNF/NCh complexes and the respective interfacial nanoparticle exchange greatly extend the conditions, favoring highly stable, green Pickering emulsions that offer potential in applications relevant to foodstuff, pharmaceutical, and cosmetic formulations.

Nanocellulose for Stabilization of Pickering Emulsions and Delivery of Nutraceuticals and Its Interfacial Adsorption Mechanism

Nanocellulose proved to be an efficient material for the preparation of Pickering emulsions with potential for replacing synthetic surfactants, which show toxic effects in the gastrointestinal (GI)

Fundamental aspects of nanocellulose stabilized Pickering emulsions and foams.

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

This review aims to summarise some of the recent progress made in the microgel field including their ability to act as emulsion stabilisers, with a focus on cellulose microgels (CMGs).

Film formation and foamability of cellulose derivatives: Influence of co-binders and substrate properties on coating holdout

Foams were prepared from hydrophobically modified ethyl(hydroxyethyl) cellulose (EHEC), methyl nanocellulose, and native microfibrillated cellulose (MFC). Their film- and foam-forming abilities,



Structural Description of the Interface of Pickering Emulsions Stabilized by Cellulose Nanocrystals.

Using several phase contrast variations, the neutron wave vector (Q) dependence with the intensity showed that CNCs are in contact with the oil phase only via the surface of the CNC and not immersed in oil since the Porod behavior is observed over the whole Q-range revealing no deformation of the oil surface at a nanometer scale.

Modifying the Contact Angle of Anisotropic Cellulose Nanocrystals: Effect on Interfacial Rheology and Structure.

The slow and reversible buildup of the layer and its unique frequency dependence indicate a weakly aggregated system, which depends on the hydrophobicity and, thus, on the contact angle of the CNC particles at the air/water interface.

Mechanisms behind the stabilizing action of cellulose nanofibrils in wet-stable cellulose foams.

CNFs can be used as stabilizing particles for aqueous foams already at a concentration as low as 5 g/L, and the major reasons for this were the small dimensions of the CNF and their high aspect ratio, which is important for gel-formation and the complex viscoelastic modulus of the particle-filled air-water interface.

Adsorption and Interfacial Layer Structure of Unmodified Nanocrystalline Cellulose at Air/Water Interfaces.

Nanocrystalline cellulose (NCC) is a promising biological nanoparticle for the stabilization of fluid interfaces.  However, the adsorption and interfacial layer structure of NCC are poorly understood

Design of Pickering Micro- and Nanoemulsions Based on the Structural Characteristics of Nanocelluloses.

A precise description of the emulsion's characteristics and properties according to particle size, shape and surface chemistry is given and the ability to produce nanosized droplets for CNC and TEMPO oxidized CNF but not for the less fibrillated CNF using HP-homogenizer is shown.

Surfactant-free high internal phase emulsions stabilized by cellulose nanocrystals.

It is proposed that this two-step process to create CNC HIPEs relies on a swelling process of the droplets that does not desorb the CNCs from the interface, decreasing the coverage ratio of theDroplets and leading to coalescence.

New Pickering emulsions stabilized by bacterial cellulose nanocrystals.

The high stability of the more covered droplets was attributed to the particle irreversible adsorption associated with the formation of a 2D network, and the sustainability and low environmental impact of cellulose open opportunities for the development of environmentally friendly new materials.

Contact angles of microellipsoids at fluid interfaces.

This work investigates the variation of the contact angle of prolate ellipsoidal colloids at a liquid-liquid interface as a function of surface chemistry and aspect ratio using freeze-fracture shadow-casting cryo-SEM to investigate the wetting of anisotropic colloidal particles.

Oil-in-Water Emulsions Stabilized by Cellulose Nanofibrils—The Effects of Ionic Strength and pH

The work showed that enzymatically treated CNFs could be suitable for use in food systems where NaCl and acid are present, while the more highly charged TEMPO-CNFs might be more suited for other applications, where they can contribute to a high emulsion viscosity even at low concentrations.