Oil-in-water emulsions stabilized by Laponite particles modified with short-chain aliphatic amines

Li, Wei; Yu, Li; Liu, Guopeng; Tan, Junjun; Liu, Shangying; D, Sun

doi:10.1016/j.colsurfa.2012.02.044

Cited by 62 publications

(42 citation statements)

References 51 publications

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“…Emulsions based on oil/water have been stabilized by clay particles 34, 35 or clay particles with surfactants 32 and chemical modifications 36, 37 . The driving force for particle assembly at these fluid interfaces is thought to be reduction of interfacial tension.…”

Section: Introductionmentioning

confidence: 99%

Combining Catalytic Microparticles with Droplets Formed by Phase Coexistence: Adsorption and Activity of Natural Clays at the Aqueous/Aqueous Interface

Cakmak

Keating

2017

Sci Rep

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Natural clay particles have been hypothesized as catalysts on the early Earth, potentially facilitating the formation of early organic (bio) molecules. Association of clay particles with droplets formed by liquidliquid phase separation could provide a physical mechanism for compartmentalization of inorganic catalysts in primitive protocells. Here we explore the distribution of natural clay mineral particles in poly(ethylene glycol) (PEG)/dextran (Dx) aqueous two-phase systems (ATPS). We compared the three main types of natural clay: kaolinite, montmorillonite and illite, all of which are aluminosilicates of similar composition and surface charge. The three clay types differ in particle size, crystal structure, and their accumulation at the ATPS interface and ability to stabilize droplets against coalescence. Illite and kaolinite accumulated at the aqueous/aqueous interface, stabilizing droplets against coalescence but not preventing their eventual sedimentation due to the mass of adsorbed particles. The ability of each clay-containing ATPS to catalyze reaction of o-phenylenediamine with peroxide to form 2,3-diaminophenazone was evaluated. We observed modest rate increases for this reaction in the presence of clay-containing ATPS over clay in buffer alone, with illite outperforming the other clays. These findings are encouraging because they support the potential of combining catalytic mineral particles with aqueous microcompartments to form primitive microreactors.Clay minerals, which are composed of aluminosilicates with layered structures, are major components of soils and sedimentary rocks and among the most abundant minerals at the surface of the Earth 1 . Clays have found a wide variety of applications since ancient times including ceramics 2 , electrochemistry 3 , organoclay/polymer nanocomposites 4 and as catalysts in chemical reactions [5][6][7] . The availability of clay minerals and their potential for catalytic activity led to the proposal of these materials as inorganic catalysts for chemical evolution of biomolecules on the early Earth 8 . Since then clay particles have been demonstrated as catalysts for polymerization of activated nucleotides and amino acids 9 , lipid self-organization 10-12 and many other possible prebiotic reactions 11,13,14 .An important step in the transition from nonliving towards living matter is thought to be compartmentalization of molecules and of reactions 15,16 . Candidates for early-Earth compartments include crevices or pores in rocks 17 , self-assemblies of lipids or simpler amphiphiles to form vesicles [18][19][20][21][22][23] , and aqueous droplets formed by liquid-liquid phase separation 15,21,24 . Combining catalytic mineral surfaces with compartments such as amphiphile vesicles or droplets formed by aqueous/aqueous phase coexistence is therefore appealing as primitive protocell models. Szostak and coworkers reported that clay minerals accelerate the spontaneous conversion of fatty acid micelles into vesicles and some clay might get encapsulated within the vesicle...

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Section: Introductionmentioning

confidence: 99%

Combining Catalytic Microparticles with Droplets Formed by Phase Coexistence: Adsorption and Activity of Natural Clays at the Aqueous/Aqueous Interface

Cakmak

Keating

2017

Sci Rep

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“…The emulsion phase volume fractions of ASA emulsion stabilized by 2% and 3% of native maize starch (based on ASA), as shown in Figure 3, are only 27% and 52%, respectively after being prepared for 24 h. Both ASA oil and dilute emulsions are released from emulsions, expressing that the native maize starch stabilized ASA emulsions are not stable to creaming and coalescence [31] fraction of 100%, i.e., a stable ASA emulsion is prepared. For the ASA emulsion with a starch charge level of 2%, its plateau emulsion phase volume fraction is only 85% even as the laponite-to-starch mass ratio is as high as 21%, suggesting that starch charge level plays a rather important role in improving the ASA emulsion stability against coalescence.…”

Section: Preparation Of Asa Emulsions Stabilized By Starch and Laponimentioning

confidence: 97%

Preparation of starch and laponite co-stabilized alkenyl succinic anhydride emulsions for paper sizing

Gong

Liu

Zhang

et al. 2016

Journal of Dispersion Science and Technology

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Stable alkenyl succinic anhydride (ASA) emulsions with approximately 25% of ASA were prepared by using native maize starch and laponite particles as stabilizers. The morphology, sizing performance and storage stability of the as-prepared ASA emulsions were evaluated.It was surprisingly found that the introduction of laponite particles could significantly improve the emulsion stability, reduce the emulsion droplet size and enhance the sizing performance while the occurrence of native maize starch depresses the deterioration of the ASA emulsion in sizing performance with increasing emulsion storage time.

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“…[28][29][30][31] Laponite is very pure and possesses small and uniform particle size, all of which favor the preparation of O/W emulsions having small droplet sizes after its wettability is carefully tuned by modification with either cationic surfactants 32 or small surfactant-like molecules. [28][29][30][31] Laponite is very pure and possesses small and uniform particle size, all of which favor the preparation of O/W emulsions having small droplet sizes after its wettability is carefully tuned by modification with either cationic surfactants 32 or small surfactant-like molecules.…”

Section: Introductionmentioning

confidence: 99%

Unique alkyl ketene dimer Pickering‐based dispersions: Preparation and application to paper sizing

Zhao

Liu

et al. 2017

J of Applied Polymer Sci

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Herein, particle-stabilized alkyl ketene dimer (AKD) dispersions were prepared using dodecyl trimethyl ammonium chloride (DTAC)-modified laponite as the stabilizer, and sodium alginate (SA) as the protective colloid. The modification of laponite particles with DTAC, which was characterized by transmission electron microscopy, infrared spectroscopy, and X-ray diffraction technique, moderately decreases the negative zeta potential and causes the dehydration of laponite particles. Consequently, the modification of laponite promotes the absorption of laponite particles on AKD droplets/spherical particle surfaces, leading to formation of AKD dispersions with reduced particle size and enhanced uniformity when DTAC-to-laponite mass ratio is <1%. Meanwhile, SA significantly increases the stability of the AKD dispersions and provides stable AKD dispersions with smaller particles when SA-to-AKD mass ratio is <0.08%. By means of confocal laser scanning microscopy, scanning electron microscope imaging and energy dispersive spectroscopy (EDS)/EDS mapping, the function of DTAC-modified laponite particles in stabilization of AKD dispersions was found to include both formation of a particle barrier around AKD particles and an increase in the moving resistance of AKD particles by laponite particles with SA. AKD dispersions at a DTAC-to-laponite mass ratio 1.0% and SA-to-AKD mass ratio 0.054% provide the smallest droplet size and best sizing performance.

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Oil-in-water emulsions stabilized by Laponite particles modified with short-chain aliphatic amines

Cited by 62 publications

References 51 publications

Combining Catalytic Microparticles with Droplets Formed by Phase Coexistence: Adsorption and Activity of Natural Clays at the Aqueous/Aqueous Interface

Combining Catalytic Microparticles with Droplets Formed by Phase Coexistence: Adsorption and Activity of Natural Clays at the Aqueous/Aqueous Interface

Preparation of starch and laponite co-stabilized alkenyl succinic anhydride emulsions for paper sizing

Unique alkyl ketene dimer Pickering‐based dispersions: Preparation and application to paper sizing

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