Cellulose as a novel amphiphilic coating for oil-in-water and water-in-oil dispersions

Rein, Dmitry M.; Khalfin, Rafail; Cohen, Yachin

doi:10.1016/j.jcis.2012.07.053

Cited by 62 publications

(53 citation statements)

References 39 publications

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“…Rein et al used regenerated cellulose as a novel and efficient eco-friendly emulsifying agent. 176,177 These authors suggest that the hydrophilic hydroxyl groups interact with the water while the more hydrophobic planes of the glucopyranose rings are located towards the hydrocarbon oil; besides, the dissolution-regeneration process facilitates the formation of an encapsulating coating at the water-oil interface because of the afforded higher mobility of the cellulose molecules. The authors demonstrated that regenerated cellulose can stabilize both oil-in-water and water-in-oil emulsions.…”

Section: Cellulose As a Dispersion Stabilizermentioning

confidence: 99%

“…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%

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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.

196

109

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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%

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.

196

109

View full text Add to dashboard Cite

show abstract

“…When these dissolved cellulose molecules were subjected to mechanical stirring in an oil/water system, they formed a stabilizing coating for the oil-in-water emulsion (Rein et al 2012). In addition, amorphous celluloses in hydrogels regenerated from the cellulose/EMIMAc solution, when subjected to mechanical stirring in an oil/water system, also formed stabilizing coatings for oil-inwater emulsions (Rein et al 2012). Rein et al (2012) indicated that, in the coating state, cellulose chains form continuous layers of amorphous cellulose molecules on the surfaces of the emulsion droplets.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, amorphous celluloses in hydrogels regenerated from the cellulose/EMIMAc solution, when subjected to mechanical stirring in an oil/water system, also formed stabilizing coatings for oil-inwater emulsions (Rein et al 2012). Rein et al (2012) indicated that, in the coating state, cellulose chains form continuous layers of amorphous cellulose molecules on the surfaces of the emulsion droplets. They also showed that the conformation and the assembly state of the cellulose regenerated from solution were affected by the oil/water interface (Rein et al 2012(Rein et al , 2014Jia et al 2013Jia et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of cellulose-coated oil-in-water emulsions

et al. 2017

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The behaviors of cellulose chains and cellulose mini-crystal in oil-in-water emulsions were studied by molecular dynamics simulations to investigate the coating states and the structural features of cellulose in these emulsions. In oil-in-water emulsion, dispersed cellulose chains gradually assemble during the progress of the simulation, eventually surrounding the octane droplet. In case of a cellulose mini-crystal, the cellulose chain at the corner of the crystal first contacts with the octane droplet through its hydrophobic surface. The other cellulose chains along the crystal plane then gradually move toward the octane molecules. In both emulsions, the cellulose was found to interact with both water and octane surfaces with specific conformations that allow the CH groups of the glucose rings to contact with octane molecules, while the OH groups of these rings contact with water molecules to form hydrogen bonds. The cellulose chains on the octane droplet also contact with each other through lateral hydrogen bonding between chains. These interactions stabilize the emulsion formed by cellulose molecules as surfactants.

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“…Based on its amphiphilicity, Rein et al have used cellulose as a novel and efficient eco-friendly emulsifying agent, playing the role of an amphiphilic coating for oil-in-water and water-in-oil dispersions (Rein et al 2012). The authors suggest that hydrophilic hydroxyl groups interact with the water while and the more hydrophobic planes of the glucopyranose rings are located towards the hydrocarbon oil.…”

Section: Cellulose Amphiphilicity and Hydrophobic Interactions: A Brimentioning

confidence: 99%

Probing cellulose amphiphilicity

Medronho

Duarte

Alves

et al. 2015

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY: Cellulose dissolution and regeneration is an increasingly active research field due to the direct relevance for numerous production processes and applications. The problem is not trivial since cellulose solvents are of remarkably different nature and thus the understanding of the subtle balance between the different interactions involved becomes difficult but crucial. There is a current discussion in literature on the balance between hydrogen bonding and hydrophobic interactions in controlling the solution behavior of cellulose. This treatise attempts to review recent work highlighting the marked amphiphilic characteristics of cellulose and role of hydrophobic interactions in dissolution and regeneration. Additionally, a few examples of our own research are discussed focusing on the role of different additives in cellulose solubility. The data does support the amphiphilic behavior of cellulose, which clearly should not be neglected when developing new solvents and strategies for cellulose dissolution and regeneration. ADDRESSES OF THE AUTHORS

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Cellulose as a novel amphiphilic coating for oil-in-water and water-in-oil dispersions

Cited by 62 publications

References 39 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

Molecular dynamics simulation of cellulose-coated oil-in-water emulsions

Probing cellulose amphiphilicity

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