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Pickering emulsion

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https://www.readbyqxmd.com/read/28513748/development-of-stable-pickering-emulsions-oil-powders-and-pickering-hipes-stabilized-by-gliadin-chitosan-complex-particles
#1
D B Yuan, Y Q Hu, T Zeng, S W Yin, C H Tang, X Q Yang
In this paper, we demonstrate the use of gliadin/chitosan complex particles (GCCPs) as particulate stabilizers of oil-in-water emulsions of natural oils and water. For this purpose, we fabricated GCCPs through a facile anti-solvent procedure and demonstrated their usage in the formation of Pickering emulsions and Pickering high internal phase emulsions (HIPEs). The GCCPs can be used to produce surfactant-free o/w Pickering emulsions and Pickering HIPEs; unfortunately these emulsions were labile to coalescence...
May 17, 2017: Food & Function
https://www.readbyqxmd.com/read/28510456/thermo-responsive-pickering-emulsions-stabilized-by-silica-nanoparticles-in-combination-with-alkyl-polyoxyethylene-ether-nonionic-surfactant
#2
Yue Zhu, Ting Fu, Kaihong Liu, Qi Lin, Xiaomei Pei, Jianzhong Jiang, Zhenggang Cui, Bernard P Binks
We put forward a simple protocol to prepare thermo-responsive Pickering emulsions. Using hydrophilic silica nanoparticles in combination with a low concentration of alkyl polyoxyethylene monododecyl ether (C12En) nonionic surfactant as emulsifier, oil-in-water (o/w) emulsions can be obtained which are stable at room temperature but demulsified at elevated temperature. The stabilization can be restored once the separated mixture is cooled and re-homogenized, and this stabilization-destabilization behavior can be cycled many times...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28504148/enhanced-emulsifying-properties-of-wood-based-cellulose-nanocrystals-as-pickering-emulsion-stabilizer
#3
Xiaoyu Gong, Yixiang Wang, Lingyun Chen
Cellulose nanocrystals are hydrophilic nanomaterials, which limits their applications as interfacial compounds. Herein, we propose using modified wood-based cellulose nanocrystals as Pickering emulsion stabilizer. Wood cellulose was consecutively oxidized and modified with phenyltrimethylammonium chloride to create hydrophobic domains comprised of phenyl groups. These modified oxidized cellulose nanocrystals (m-O-CNCs) were homogeneous/electrostatically stable in water and they can stabilize O/W Pickering emulsions...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28504128/combined-emulsifying-capacity-of-polysaccharide-particles-of-different-size-and-shape
#4
María Matos, Ali Marefati, Romain Bordes, Gemma Gutiérrez, Marilyn Rayner
The aim of this study is to understand mixed systems of two types of particles with different size and shape, quinoa starch granules (NQ) and cellulose nanocrystals (CNC), to stabilize oil-in-water (O/W) emulsions. This study considers the extent of Pickering stabilization with respect to which particle type dominates at droplet interfaces and how stability is affected by the addition of one particle type to already formed emulsions, or combining both, simultaneously. Results demonstrate that the order of addition has an influence allowing to predominantly have NQ particles at the interface when both types are added simultaneously...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28493002/dual-prevention-for-uv-induced-skin-damage-incorporation-of-melatonin-loaded-elastic-niosomes-into-octyl-methoxycinnamate-pickering-emulsions
#5
Gulcin Arslan Azizoglu, Sakine Tuncay Tanriverdi, Fadime Aydin Kose, Petek Ballar Kirmizibayrak, Ozgen Ozer
Incorporation of antioxidants into sunscreens is a logical approach, yet co-delivery of them with UV filters is a challenge. Here, we purposed a combination therapy, in which the chemical UV filter, octyl methoxycinnamate, was accumulated on upper skin while the antioxidant, melatonin, can penetrate deeper layers to show its effects. Melatonin-loaded elastic niosomes and octyl methoxycinnamate Pickering emulsion were prepared separately. Lyophilized elastic niosomes were dispersed into the Pickering emulsion to prepare the proposed combination formulation...
May 10, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28492312/synthesis-and-characterization-of-graphene-oxide-polystyrene-composite-capsules-with-aqueous-cargo-via-a-water-oil-water-multiple-emulsion-templating-route
#6
Muthana Ali, Thomas M McCoy, Ian R McKinnon, Mainak Majumder, Rico F Tabor
Graphene oxide/polystyrene (GO/PS) nanocomposite capsules containing a two-compartment cargo have been successfully fabricated using a Pickering emulsion strategy. Highly purified GO sheets with typically micron-scale lateral dimensions and amphiphilic characteristics were prepared from the oxidation reaction of graphite with concomitant exfoliation of the graphite structure. These GO sheets were employed as a stabilizer for oil-in-water emulsions where the oil phase comprised toluene or olive oil. The stability and morphology of the emulsions were extensively studied as a function of different parameters including GO concentration, aqueous phase pH, ultrasonication time, effects of added electrolytes and stability to dilution...
May 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28471042/dumbbell-shaped-bi-component-mesoporous-janus-solid-nanoparticles-for-biphasic-interface-catalysis
#7
Tianyu Yang, Lijuan Wei, Lingyan Jing, Jifen Liang, Xiaoming Zhang, Min Tang, Michael J Monteiro, Ying Ian Chen, Yong Wang, Sai Gu, Dongyuan Zhao, Hengquan Yang, Jian Liu, G Q Max Lu
There is a strong desire to design and synthesize catalysts that assemble at the oil-water interface to improve the efficiency of biphasic reactions. Anisotropic dumbbell-shaped bi-component mesoporous carbon-organosilica Janus particles with asymmetric wettability are synthesized through a one-step compartmentalized growth of a mesoporous organosilica sphere attached to a mesoporous resorcinol-formaldehyde (RF) sphere. A library was prepared of tunable Janus particles possessing diverse hollow structures with various functionalities...
May 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28467095/interfacial-growth-of-tio2-rgo-composite-by-pickering-emulsion-for-photocatalytic-degradation
#8
Shenping Zhang, Jian Xu, Jun Hu, Changzheng Cui, Honglai Liu
A 2D sandwich-like TiO2-rGO composite was fabricated by the Pickering emulsion approach to improve the photocatalytic efficiency. Through an in situ growth of antase-TiO2 nanoparticles on the interface of O/W type GO Pickering emulsion, TiO2 nanoparticles were closely and densely packed on the surface of well-exfoliated rGO sheets; meanwhile, many mesoporous voids acting as the adsorption chamber and microreactor were produced. Evaluated by methylene blue (MB) degradation, its photocatalytic activity was prominent compared with the common TiO2-based photocatalyst, with the rate constants 5 and 3...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28460931/bioaccessibility-and-antioxidant-activity-of-curcumin-after-encapsulated-by-nano-and-pickering-emulsion-based-on-chitosan-tripolyphosphate-nanoparticles
#9
Bakht Ramin Shah, Chunlan Zhang, Yan Li, Bin Li
In the current study the influence of different lipid-based formulations (Pickering and nanoemulsions) and their droplet size on curcumin encapsulation and bioaccessibility, as well as on its anti-oxidant activity was investigated. Oil-in-water Pickering emulsion stabilized by chitosan-tripolyphosphate (CS-TPP) nanoparticles and nanoemulsions containing an organic phase (Span80:Tween80), were prepared with either medium chain triglyceride (MCT) or corn oil as long chain triglyceride (LCT). An in vitro gastrointestinal (GIT) model consisting of mouth, gastric and intestinal phases was used to characterize the rate and extent of lipid phase digestion of the ingested samples...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28460219/electrostatic-assembly-of-zwitterionic-and-amphiphilic-supraparticles
#10
Michael Maas, Carolina C Silvério, Jens Laube, Kurosch Rezwan
We demonstrate the electrostatic assembly of oppositely charged silica particles into an ensemble of well-defined core-satellite supraparticles, which are a type of patchy particle. To achieve controlled heteroaggregation, we used oppositely charged silica particles with different sizes ranging from 5nm to 150nm at several concentrations. The assembly works best with larger particles, resulting in a fairly low polydispersity and a low amount of bridging between the individual clusters. Using smaller particles produces high polydispersity, large clusters and uncontrolled aggregation and bridging...
April 25, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28451672/microencapsulation-through-thermally-sintering-pickering-emulsion-based-colloidosomes
#11
Dezhong Yin, Licong Bai, Yu Jia, Jinjie Liu, Qiuyu Zhang
Microcapsules of a phase change material synthesized by thermally sintering Pickering emulsion-based colloidosomes were demonstrated. The protocol included three steps: (1) monodispersive poly(glycidyl methacrylate) (PGMA) microspheres were prepared by dispersive polymerization and were endowed with a contact angle of 63.4° for oil-in-water Pickering stabilization by hydrolysis. (2) By phase separation during Pickering emulsion polymerization, microcapsules with a structure of a single PCM core and a PGMA armored polystyrene shell were fabricated...
May 24, 2017: Soft Matter
https://www.readbyqxmd.com/read/28449988/development-of-antioxidant-pickering-high-internal-phase-emulsions-hipes-stabilized-by-protein-polysaccharide-hybrid-particles-as-potential-alternative-for-phos
#12
Tao Zeng, Zi-Ling Wu, Jun-You Zhu, Shou-Wei Yin, Chuan-He Tang, Lei-Yan Wu, Xiao-Quan Yang
We report for the first time the usage of mono-dispersed gliadin/chitosan hybrid particles as a particulate emulsifier for Pickering high internal phase emulsions (HIPEs) development. The hybrid particles with partial wettability were fabricated at pH 5.0 using a facile anti-solvent route. Stable Pickering HIPEs with internal phases of up to 83% can be prepared with low particle concentrations (0.5-2%). The hybrid latexes were effectively adsorbed and anchored at the oil-water interface to exert steric hindrance against coalescence...
September 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28433180/novel-carboxymethyl-cellulose-polyvinyl-alcohol-blend-films-stabilized-by-pickering-emulsion-incorporation-method
#13
Hadi Fasihi, Mohammad Fazilati, Mahdi Hashemi, Nooshin Noshirvani
The aim of this study was to investigate the possibility of increasing the antimicrobial and antioxidant properties of biodegradable active films stabilized via Pickering emulsions. The blend films were prepared from carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA), emulsified with oleic acid (OL) and incorporated with rosemary essential oil (REO). Formation of Pickering emulsion was confirmed by scanning electron microscopy (SEM), optical microscopy, mean droplet size and emulsion stability. Morphological, optical, physical, mechanical, thermal, antifungal and antioxidant properties of the films incorporated with different concentrations of REO (0...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28419943/interconnectivity-of-macroporous-molecularly-imprinted-polymers-fabricated-by-hydroxyapatite-stabilized-pickering-high-internal-phase-emulsions-hydrogels-for-the-selective-recognition-of-protein
#14
Yanhua Sun, Yuqing Li, Jiangfeng Xu, Ling Huang, Tianyun Qiu, Shian Zhong
Hydroxyapatite hybridized molecularly imprinted polydopamine polymers with selective recognition of bovine hemoglobin (BHb) were successfully prepared via Pickering oil-in-water high internal phase emulsions-hydrogels and molecularly imprinting technique. The emulsions were stabilized by hydroxyapatite of which the wettability was modified by 3-methacryloxypropyltrimethoxysilane. The materials were characterized by SEM, IR and TGA. The results showed that the BHb imprinted polymers based on Pickering hydrogels (Hydro-MIPs) possess macropores ranging from 20μm to 50μm, and their large numbers of amino groups and hydroxyl groups result in a favorable adsorption capacity for BHb...
April 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28414514/pickering-emulsions-in-foods-opportunities-and-limitations
#15
Christina Linke, Stephan Drusch
In order to critically discuss the potential of Pickering-type emulsions in food applications this review provides the theoretical background of the stabilizing mechanisms, the resulting requirements for particles to stabilize these systems and the limitations resulting from these fundamental considerations. Food grade particle systems investigated in the past are presented. It becomes obvious that with a proper choice of a particle, oil-in-water as well as water-in-oil emulsions can be achieved. For highly viscous products, products with a high internal phase volume and foams Pickering particles offer alternatives to commonly used surfactants...
April 17, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28414456/interfacial-rheology-of-sterically-stabilized-colloids-at-liquid-interfaces-and-its-effect-on-the-stability-of-pickering-emulsions
#16
Rob Van Hooghten, Victoria E Blair, Anja Vananroye, Andrew B Schofield, Jan Vermant, Job H J Thijssen
Particle-laden interfaces can be used to stabilize a variety of high-interface systems, from foams over emulsions to polymer blends. The relation between the particle interactions, the structure and rheology of the interface, and the stability of the system remains unclear. In the present work, we experimentally investigate how micron-sized, near-hard-sphere-like particles affect the mechanical properties of liquid interfaces. In particular, by comparing dried and undried samples, we investigate the effect of aggregation state on the properties of the particle-laden liquid interface and its relation to the stability of the corresponding Pickering emulsions...
April 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28406022/the-performance-of-nanoparticulate-graphitic-carbon-nitride-as-an-amphiphile
#17
Jingsan Xu, Markus Antonietti
Graphitic carbon nitride (g-C3N4), a polymeric semiconductor that finds potential applications in multiple areas, is shown to feature amphiphilic behavior. Since the feasibility of g-C3N4 aqueous colloids is well-established, g-C3N4 can be viewed as an effective and well-accessible colloidal amphiphile. Its activity at different interfaces (liquid-liquid, liquid-solid, and liquid-air) is illustrated: g-C3N4 is able to stabilize Pickering emulsions formed by water and organic solvents, and also, gas-filled g-C3N4 frameworks based on those emulsions are obtained by natural drying...
April 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28401145/porous-and-magnetic-molecularly-imprinted-polymers-via-pickering-high-internal-phase-emulsions-polymerization-for-selective-adsorption-of-%C3%AE-cyhalothrin
#18
Yunlong Wu, Yue Ma, Jianming Pan, Runxing Gu, Jialu Luo
A novel macroporous magnetic molecularly imprinted polymer (MMIPs) of was prepared by W/O Pickering (high internal phase emulsions) HIPEs polymerization, and then it was adopted as adsorbent for selective adsorption of λ-cyhalothrin (LC). In static conditions, adsorption capacity of LC increased rapidly in the first 60 min and reached to equilibrium in ~2.0 h. Excellent conformity of the second-order model confirmed the chemical nature of the interaction between the LC and imprinted sites. The fitting adsorption isotherm was a Langmuir type, and the maximum monolayer adsorption capacity at 298 K was 404...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28397896/tailored-microstructure-of-colloidal-lipid-particles-for-pickering-emulsions-with-tunable-properties
#19
Anja Schröder, Joris Sprakel, Karin Schroën, Claire C Berton-Carabin
Sub-micron colloidal lipid particles (CLPs) can successfully be used as Pickering stabilizers in oil-in-water (O/W) emulsions, leading to an enhanced physical stability compared to conventional emulsifier-stabilized emulsions. Varying the lipid solid-liquid ratio leads to particles with distinct nanostructure and morphology, resulting in tunable emulsion stabilization performance. Our CLPs are produced by hot high pressure homogenization of high melting point fats in water, and subsequent cooling to induce lipid crystallization...
May 3, 2017: Soft Matter
https://www.readbyqxmd.com/read/28385223/characterizations-of-oil-in-water-emulsion-stabilized-by-different-hydrophobic-maize-starches
#20
Fan Ye, Ming Miao, Bo Jiang, Bruce R Hamaker, Zhengyu Jin, Tao Zhang
The molecular structure, rheological properties, microstructure and physical stability of oil-in-water emulsions using octenyl succinic-sugary maize soluble starch (OS-SMSS) were investigated and compared with two commercial OS-starches (HI-CAP 100 and Purity Gum 2000). The degree of substitution (DS), weight-average molecular weight (Mw) and z-root mean square radius of gyration (Rz) of OS-SMSS, HI-CAP 100 and Purity Gum 2000 were 0.0050, 223.4×10(5)g/mol and 38.8nm, 0.0037, 9.6×10(5)g/mol and 29.3nm, and 0...
June 15, 2017: Carbohydrate Polymers
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