Pickering emulsions synergistic-stabilized by amphoteric lignin and SiO2 nanoparticles: Stability and pH-responsive mechanism

Lu, Shuo; Yang, Dongjie; Wang, Miao; Yan, Mengzhen; Qian, Yong; Zheng, Dafeng; Qiu, Xueqing

doi:10.1016/j.colsurfa.2019.124158

Cited by 33 publications

(22 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where γ 0 denotes the interfacial tension of the pristine water/xylene interface (0.04 N m −1 ) and θ is the equilibrium contact angle of the oil/water interface in the presence of SEKL/N‐SEKL. Measuring θ can help predict the emulsion stability, because the energy of adsorption at the interface based on Equation (1) would be relatively small <10 k B T if the particle is too hydrophilic ( θ ≤20°) or too hydrophobic ( θ ≥160°) . The WCA and OCA images of the SEKL/N‐SEKL surfaces at pH 3, 7, and 11 are depicted in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…[7,8] However,t here are severalo ther applications for which the short-term stabilization of an emulsion or reversible adsorption of surfactant is the primaryc oncern,i ncluding emulsion polymerization, [9] oil recovery, [10] andi nterfacial catalysis for biphasic reactions. [11] Switching on and off of Pickering emulsions has been extensively studied at different pH values, [12] temperatures, [13] magnetic fields, [14] and in the presence of CO 2 . [15] However,t oo ur knowledge,u sing one emulsifier to produce both Pickering and non-Pickering (conventional) emulsions and to demulsify in af ormulation is a novel approach.…”

Section: Introductionmentioning

confidence: 99%

“…Also, increasing the oil/water ratio would limit its performance as an effective emulsifier. [12] Therefore, lignin functionalizationh as gained considerable attention to promote the application of lignin as ap olymeric emulsifier. [28] Increasing the dosage of emulsifier or salt and alteringt he pH are among the techniques to improve emulsion properties, [29] for example" emulsion fraction, longterm stability,o rv iscosity.L ie tal.…”

Section: Introductionmentioning

confidence: 99%

“…It is reported that a large amount of acid or alkali is required to activate lignin precipitation/dissolution. Also, increasing the oil/water ratio would limit its performance as an effective emulsifier . Therefore, lignin functionalization has gained considerable attention to promote the application of lignin as a polymeric emulsifier .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Ghavidel

Fatehi

2020

ChemSusChem

View full text Add to dashboard Cite

Sulfoethylated lignin (SEKL) polymeric surfactant and sulfoethylated lignin nanoparticles (N‐SEKL) with a size of 750±50 nm are produced by using a facile green process involving a solvent‐free reaction and acidification‐based fractionation. SEKL forms a liquid‐like conventional emulsion with low viscosity that has temporary stability (5 h) at pH 7. However, N‐SEKL forms a gel‐like, motionless, and ultra‐stable Pickering emulsion through a network of interactions between N‐SEKL particles, which creates steric hindrance among the oil droplets at pH 3. The deposition of SEKL and N‐SEKL on the oil surface is monitored by a using a quartz crystal microbalance. Experimentally, the formation of emulsions at pH 7 is found to be reversible owing to the low adsorption energy ΔE of SEKL on the oil droplet (ΔE≈15 kBT), which is determined with the help of three‐phase contact‐angle measurements. However, the high desorption energy (ΔE≈6.0×105 kBT) of N‐SEKL makes it irreversibly adsorb on the oil droplets. SEKL is too hydrophilic to attach to the oil interface (ΔE≈0) and thus does not facilitate emulsion formation at pH 11. Therefore, it is feasible to apply SEKL for the formulation of Pickering or non‐Pickering emulsions in the form of nanoparticles or polymeric surfactants, depending on the targeted application.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Ghavidel

Fatehi

2020

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…However, CaCO 3 particles with small particle size have strong interface energy and are always easy to agglomeration, which is difficult to form stable emulsion (19). Therefore, the surface of CaCO 3 particles is usually modified to improve its hydrophilicity/hydrophobicity, such as grafting active groups onto the surface of particles (20). Meanwhile, the stability of emulsion can be improved to a certain extent by introducing food-grade polymer stabilizers such as protein and polysaccharides.…”

Section: Introductionmentioning

confidence: 99%

Effect of emulsification methods on the physicochemical properties of emulsion stabilized by calcium carbonate and sodium alginate

et al. 2022

View full text Add to dashboard Cite

Our lab’s studies have found that heavy calcium carbonate (CaCO3) with sodium alginate (SA) can synergistically stabilize Pickering emulsion. However, there were significant differences in the flow characteristics of the emulsions obtained by different preparation methods during storage. Herein, in this current work, Pickering emulsions were prepared by two-step emulsifying method (SA was added into the primary emulsion stabilized by CaCO3 for secondary shearing, M1) and one-step emulsifying method (oil phase was added to homogeneous dispersed CaCO3-SA solution for one-step shearing, M2), respectively. The particle size, microstructure, rheology and microrheological properties of these two kinds of emulsions and the interaction of CaCO3 with SA were analyzed. The results showed that the droplet size of M1 emulsion was 21.78–49.62 μm, and that of M2 emulsion was 6.50–11.87 μm. M1 emulsion had stronger viscoelasticity, and could transform into a gel state during storage. However, M2 emulsion remained in flow condition all the time which was related to the interaction between SA and CaCO3 in the aqueous phase.

show abstract

Pickering emulsion stabilized by lignin particles: Influence of oil phase, lignin concentration, and particle size

Pang,

Luo,

et al. 2024

Colloid Polym Sci

View full text Add to dashboard Cite

Pickering emulsion stabilized by lignin particles has many advantages such as high exibility, natural non-toxicity, anti-oxidation and anti-ultraviolet. In order to promote the application of industrial lignin in the eld of Pickering emulsions, this study has done a comparatively systematic and basic research on Pickering emulsions stabilized by lignin particles. The emulsi cation effects of lignin particles on cyclohexane and n-decanol which have opposite polarity were compared rstly under different oil-water ratios. It was found that stable emulsions formed when the three-phase contact angle of oil/water/lignin was closer to 90°. The weakly polar cyclohexane could be well-emulsi ed by lignin particles, while the strong polar n-decanol could hardly be. Cyclohexane was used as the oil phase to discuss the emulsi cation ability of lignin particles under different concentration or with different particle size. The results show increasing the concentration of lignin particles or reducing the particle size can improve the emulsi cation performance.

show abstract

Pickering emulsions synergistic-stabilized by amphoteric lignin and SiO2 nanoparticles: Stability and pH-responsive mechanism

Cited by 33 publications

References 47 publications

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Effect of emulsification methods on the physicochemical properties of emulsion stabilized by calcium carbonate and sodium alginate

Pickering emulsion stabilized by lignin particles: Influence of oil phase, lignin concentration, and particle size

Contact Info

Product

Resources

About