New Pickering Emulsions Stabilized by Bacterial Cellulose Nanocrystals

Kalashnikova, Irina; Bizot, Hervé; Cathala, Bernard; Capron, Isabelle

doi:10.1021/la200971f

Cited by 663 publications

(583 citation statements)

References 49 publications

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“…Nanocrystalline celluloses have also been used as stabilizers of emulsions. 176,[181][182][183][184] However, in comparison with cellulose derivatives, the mechanisms are very different. Cellulose derivatives behave similarly to any flexible or semi-flexible amphiphilic polymer, like graft and block copolymers, and provide steric stabilization.…”

Section: Cellulose As a Dispersion Stabilizermentioning

confidence: 99%

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Lindman

Medronho

Alves

et al. 2017

Phys. Chem. Chem. Phys.

176

100

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aCellulose is the most abundant polymer and a very important renewable resource. Since cellulose cannot be shaped by melting, a major route for its use for novel materials, new chemical compounds and renewable energy must go via the solution state. Investigations during several decades have led to the identification of several solvents of notably different character. The mechanisms of dissolution in terms of intermolecular interactions have been discussed from early work but, even on fundamental aspects, conflicting and opposite views appear. In view of this, strategies for developing new solvent systems for various applications have remained obscure. There is for example a strong need for using forest products for higher value materials and for environmental and cost reasons to use water-based solvents. Several new water-based solvents have been developed recently but there is no consensus regarding the underlying mechanisms. Here we wish to address the most important mechanisms described in the literature and confront them with experimental observations. A broadened view is helpful for improving the current picture and thus cellulose derivatives and phenomena such as fiber dissolution, swelling, regeneration, plasticization and dispersion are considered. In addition to the matter of hydrogen bonding versus hydrophobic interactions, the role of ionization as well as some applications of new knowledge gained are highlighted.

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Section: Cellulose As a Dispersion Stabilizermentioning

confidence: 99%

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Lindman

Medronho

Alves

et al. 2017

Phys. Chem. Chem. Phys.

176

100

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“…Another promising application of cellulose particles is emulsion stabilization, which could be even more effective than that in a case of application of molecular surfactants [9,10]. These, so-called Pickering, emulsions stabilized by solid particles instead of surfactants possessed a high resistance to coalescence and could be successfully used for food industry as well as for fabrication of core-shell nano/microparticles for drug or cell delivery [11,12]. Thus, the work aims to fabrication of micro-and nanocrystalline forms of flax stalks cellulose and evaluation of their applicability as reinforcing fillers in composite hydroxyethylcellulose films as well as stabilization agents for oil/water Pickering emulsions, including ones used for preparation of polylactide microparticles through oil/water solvent evaporation technique.…”

Section: Introductionmentioning

confidence: 99%

Application of micro- and nanocrystalline cellulose

SOTNIKOVA

Демина

Istomin

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Micro-and nanocrystalline forms of cellulose were extracted from flax stalks and evaluated in terms of their applicability for various materials science tasks. It was revealed that both form of cellulose had anisometric morphology with length of 27.1 m and 159 nm; diameter of 8.7 m and 85 nm, respectively. They were used as reinforcing fillers for fabrication of composite films based on hydroxyethylcellulose. Film-forming and mechanical properties of the composite materials were significantly varied in dependence on filler content (010 wt.%) and size. As a second option of micro-and nanocrystalline cellulose application, a study of their effectiveness as stabilizing agents for oil/water Pickering emulsions was carried out. In contrast to micron-sized cellulose the nanocrystalline form appeared to be successful in the process of CH2Cl2/water interface stabilization and fabrication of polylactide microparticles via oil/water Pickering emulsion solvent evaporation technique.

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“…CNCs have recently been used as emulsion stabilizers by taking advantage of their selfassembling ability at the oil-water interface, similar to particle-stabilized Pickering systems [16,17]. They thus lead to the formation of ultrastable and monodispersed oil-in-water emulsions.…”

Section: Introductionmentioning

confidence: 99%

Some modification of cellulose nanocrystals for functional Pickering emulsions

Saidane¹,

Perrin²,

Cherhal³

et al. 2016

Phil. Trans. R. Soc. A.

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Cellulose nanocrystals (CNCs) are negatively charged colloidal particles well known to form highly stable surfactant-free Pickering emulsions. These particles can vary in surface charge density depending on their preparation by acid hydrolysis or applying post-treatments. CNCs with three different surface charge densities were prepared corresponding to 0.08, 0.16 and 0.64 e nm −2 , respectively. Posttreatment might also increase the surface charge density. The well-known TEMPO-mediated oxidation substitutes C 6 -hydroxyl groups by C 6 -carboxyl groups on the surface. We report that these different modified CNCs lead to stable oil-in-water emulsions. TEMPO-oxidized CNC might be the basis of further modifications. It is shown that they can, for example, lead to hydrophobic CNCs with a simple method using quaternary ammonium salts that allow producing inverse water-in-oil emulsions. Different from CNC modification before emulsification, modification can be carried out on the droplets after emulsification. This way allows preparing functional capsules according to the layer-by-layer process. As a result, it is demonstrated here the large range of use of these biobased rod-like nanoparticles, extending therefore their potential use to highly sophisticated formulations.

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New Pickering Emulsions Stabilized by Bacterial Cellulose Nanocrystals

Cited by 663 publications

References 49 publications

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Application of micro- and nanocrystalline cellulose

Some modification of cellulose nanocrystals for functional Pickering emulsions

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