Cellulose-stabilized oil-in-water emulsions: Structural features, microrheology, and stability

Costa, Carolina; Rosa, Pedro J.; Filipe, Alexandra; Medronho, Bruno; Romano, Anabela; Liberman, Lucy; Talmon, Yeshayahu; Norgren, Magnus

doi:10.1016/j.carbpol.2020.117092

Cited by 34 publications

(35 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is also worth pointing out that cryo-SEM is different to standard electron microscopy, and previous work has shown that individual cellulose chains at the droplet surface are also not visible in nonpolymerized particles. 52 …”

Section: Resultsmentioning

confidence: 99%

Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Nigmatullin

Koev

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Linseed oil-in-water Pickering emulsions are stabilized by both sulfated CNCs (sCNCs) and octylamine-modified CNCs (oCNCs). oCNCs with hydrophobic moieties grafted on the surfaces of otherwise intact nanocrystals provided emulsions exhibiting stronger resistance to creaming of oil droplets, compared with unmodified sCNCs. sCNCs were not able to completely stabilize linseed oil in water at low CNC concentrations while oCNCs provided emulsions with no unemulsified oil residue at the same concentrations. Oil droplets in oCNC emulsions were smaller than those in samples stabilized by sCNCs, corresponding with an increased hydrophobicity of oCNCs. Cryo-SEM imaging of stabilized droplets demonstrated the formation of a CNC network at the oil–water interface, protecting the oil droplets from coalescence even after compaction under centrifugal force. These oil droplets, protected by a stabilized CNC network, were dispersed in a water-based commercial varnish, to generate a composite coating. Scratches made on these coatings self-healed as a result of the reaction of the linseed oil bled from the damaged droplets with oxygen. The leakage and drying of the linseed oil at the location of the scratches happened without intervention and was accelerated by the application of heat.

show abstract

Section: Resultsmentioning

confidence: 99%

Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Nigmatullin

Koev

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Soft cellulose microgels also impart an outstanding stability against flocculation because of the thick viscoelastic layers formed at the interface [15]. The mechanism behind droplet stabilization in emulsions prepared with cellulose particles is similar to that operating for nanocelluloses as described above, i.e., a combination of Pickering adsorption and network stabilization, often showing gel-like characteristics upon a concentration increase of cellulose [79,[82][83][84].…”

Section: Molecular and Regenerated Cellulose At Interfacesmentioning

confidence: 87%

“…One, is by following the dissolution-regenerationemulsification approach, resulting in Pickering emulsions of solid or soft cellulose particles (microgels), since the oil is either dispersed in a water suspension of cellulose particles or in a water suspension of cellulose microgels, respectively [76][77][78][79][80][81][82][83]. Another way, is to follow the dissolution-emulsification-("in situ")regeneration approach, where the oil is directly dispersed in the cellulose solution, and regeneration takes place at the oil-water interface ("in situ") [34,84]. This way, the oil droplets seem to be stabilized by a "cellulose film" with a smooth appearance, contrasting with the rough networks and particulate appearances of Pickering emulsions (Figure 4) [7,84].…”

Section: Molecular and Regenerated Cellulose At Interfacesmentioning

confidence: 99%

“…Another way, is to follow the dissolution-emulsification-("in situ")regeneration approach, where the oil is directly dispersed in the cellulose solution, and regeneration takes place at the oil-water interface ("in situ") [34,84]. This way, the oil droplets seem to be stabilized by a "cellulose film" with a smooth appearance, contrasting with the rough networks and particulate appearances of Pickering emulsions (Figure 4) [7,84]. Another fundamental difference between the two described approaches is related to the existence of dissolved cellulose during the oil emulsification, which acts as a polymeric surfactant by decreasing the IFT, and possibly contributing for a reduction in droplet size.…”

Section: Molecular and Regenerated Cellulose At Interfacesmentioning

confidence: 99%

“…Particle-stabilized emulsions by longer NCC (bacterial cellulose) (a), shorter NCC (b), and regenerated cellulose (dissolution-regeneration-emulsification approach) (d).Emulsions prepared from molecular solutions of cellulose (dissolution-emulsification-"in-situ" regeneration approach) (c and e). Reprinted (adapted) with permission from Ref [49,77,80,84]…”

mentioning

confidence: 99%

See 2 more Smart Citations

Cellulose as a Natural Emulsifier: From Nanocelluloses to Macromolecules

Costa¹,

Medronho²,

Lindman³

et al. 2021

Cellulose Science and Derivatives

Self Cite

View full text Add to dashboard Cite

During the last decade, cellulose structural features have been revisited, with particular focus on its structural anisotropy (amphiphilicity) and interactions determining its recalcitrance to dissolution. Evidences for cellulose amphiphilicity are patent, for instance, in its capacity to adsorb at oil–water interfaces, thus being capable of stabilizing emulsions. This behavior is observable in all its forms, from cellulose nanoparticles to macromolecules. This chapter is divided into two main parts; first, the fundamentals of emulsion formation and stabilization will be introduced, particularly focusing on the role of natural emulsifiers. Secondly, the emerging role of cellulose as a natural emulsifier, where the ability of cellulose to form and stabilize emulsions is revisited, from cellulose nanoparticles (Pickering-like effect) to macromolecules (i.e., cellulose derivatives and native molecular cellulose).

show abstract

Fabrication and stability of W/O/W emulsions stabilized by gum arabic and polyglycerol polyricinoleate

Niu,

Zhao,

et al. 2023

J Sci Food Agric

View full text Add to dashboard Cite

BackgroundIn order to study the effect of adsorption of surfactant at the two interfacial layers on emulsion stability, the kinetically stable W/O/W emulsion carriers were prepared using polyglycerol polyricinoleate (PGPR) and gum arabic (GA) as emulsifiers. The relationship between the adsorption of the surfactant and the stability mechanism of the emulsions was elucidated.ResultsWhen the contents of PGPR and GA were low, the interfaces between oil and the inner and outer water phases, respectively, could not be completely covered. However, when the concentration of PGPR was higher than 60 g kg‐1, the excess PGPR was adsorbed on the interface between the oil phase and the outer water phase. When the concentration of GA reached 80 g kg‐1, more GA was adsorbed to the oil‐in‐water interface. Moreover, the presence of PGPR on the interface could reduce the adsorption capacity of GA. Two types of kinetically stable emulsions were obtained by optimizing the interface composition (60 g kg‐1 GA/80 g kg‐1 PGPR and 60 g kg‐1 PGPR/80 g kg‐1 GA). The kinetically stable W/O/W emulsions prepared in this study were successfully used to encapsulate a hydrophilic vitamin (VB12) with an encapsulation efficiency (EE) of 80% and release efficiency (RE) of 95%. The interfacial adsorption GA can accelerate the hydrolysis of fat.ConclusionOverall, this study provides a new strategy for the preparation of W/O/W emulsions, which might be beneficial for application in food, cosmetic, chemical, and pharmaceutical industries.This article is protected by copyright. All rights reserved.

show abstract

Cellulose-stabilized oil-in-water emulsions: Structural features, microrheology, and stability

Cited by 34 publications

References 26 publications

Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Cellulose as a Natural Emulsifier: From Nanocelluloses to Macromolecules

Fabrication and stability of W/O/W emulsions stabilized by gum arabic and polyglycerol polyricinoleate

Contact Info

Product

Resources

About