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Pickering emulsion

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https://www.readbyqxmd.com/read/28642862/fabrication-of-cmc-g-pam-superporous-polymer-monoliths-via-eco-friendly-pickering-mipes-for-superior-adsorption-of-methyl-violet-and-methylene-blue
#1
Feng Wang, Yongfeng Zhu, Wenbo Wang, Li Zong, Taotao Lu, Aiqin Wang
A series of superporous carboxymethylcellulose-graft-poly(acrylamide)/palygorskite (CMC-g-PAM/Pal) polymer monoliths presenting interconnected pore structure and excellent adsorption properties were prepared by one-step free-radical grafting polymerization reaction of CMC and acrylamide (AM) in the oil-in-water (O/W) Pickering-medium internal phase emulsions (Pickering-MIPEs) composed of non-toxic edible oil as a dispersion phase and natural Pal nanorods as stabilizers. The effects of Pal dosage, AM dosage, and co-surfactant Tween-20 (T-20) on the pore structures of the monoliths were studied...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28640295/stabilization-of-a-non-aqueous-self-double-emulsifying-delivery-system-of-rutin-by-fat-crystals-and-nonionic-surfactants-preparation-and-bioavailability-study
#2
Qiang Wang, Juan Huang, Caibiao Hu, Nan Xia, Tong Li, Qiang Xia
Literature examples of non-aqueous Pickering emulsions stabilized by fat crystals are very rare. Moreover, the applications of rutin are limited due to its low solubility in both water and oils (less than 0.10 mg g(-1) and 0.25 mg g(-1), respectively). Thus, herein, we developed an optimum formulation of a non-aqueous self-double-emulsifying delivery system (SDEDS) containing rutin and evaluated its oral bioavailability. The new formulation stabilized by fat crystals (glycerol monostearate, GMS) and nonionic surfactants was prepared via a two-step emulsification process...
June 22, 2017: Food & Function
https://www.readbyqxmd.com/read/28636315/fabrication-of-hierarchical-macroporous-biocompatible-scaffolds-by-combining-pickering-high-internal-phase-emulsion-templates-with-three-dimensional-printing
#3
Ting Yang, Yang Hu, Chaoyang Wang, Bernard P Binks
Biocompatible and biodegradable porous scaffolds with adjustable pore structure have aroused increasing interest in bone tissue engineering. Here, we report a facile method to fabricate hierarchical macroporous biocompatible (HmPB) scaffolds by combining Pickering high internal phase emulsion (HIPE) templates with three-dimensional (3D) printing. HmPB scaffolds composed of a polymer matrix of poly(L-lactic acid), PLLA, and poly(ε-caprolactone), PCL, are readily fabricated by solvent evaporation of 3D printed Pickering HIPEs which are stabilized by hydrophobically modified silica nanoparticles (h-SiO2)...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28629016/effect-of-stearic-acid-modified-hap-nanoparticles-in-different-solvents-on-the-properties-of-pickering-emulsions-and-hap-plla-composites
#4
Ming Zhang, Ai-Juan Wang, Jun-Ming Li, Na Song
Stearic acid (Sa) was used to modify the surface properties of hydroxyapatite (HAp) in different solvents (water, ethanol or dichloromethane(CH2Cl2)). Effect of different solvents on the properties of HAp particles (activation ratio, grafting ratio, chemical properties), emulsion properties (emulsion stability, emulsion type, droplet morphology) as well as the cured materials (morphology, average pore size) were studied. FT-IR and XPS results confirmed the interaction occurred between stearic acid and HAp particles...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28626551/pickering-emulsions-stabilized-by-coloured-organic-pigment-particles
#5
Bernard P Binks, Samuel O Olusanya
The possibility of stabilizing emulsions of water and non-polar alkane with pure, coloured organic pigment particles is explored. Seven pigment types each possessing a primary colour of the rainbow were selected. Their solubility in water or heptane was determined using a spectrophotometric method and their surface energies were derived from the contact angles of probe liquids on compressed disks of the particles. As expected, most of the pigments are relatively hydrophobic but pigment orange is quite hydrophilic...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28604713/phagocytosis-inspired-behaviour-in-synthetic-protocell-communities-of-compartmentalized-colloidal-objects
#6
Laura Rodríguez-Arco, Mei Li, Stephen Mann
The spontaneous assembly of micro-compartmentalized colloidal objects capable of controlled interactions offers a step towards rudimentary forms of collective behaviour in communities of artificial cell-like entities (synthetic protocells). Here we report a primitive form of artificial phagocytosis in a binary community of synthetic protocells in which multiple silica colloidosomes are selectively ingested by self-propelled magnetic Pickering emulsion (MPE) droplets comprising particle-free fatty acid-stabilized apertures...
June 12, 2017: Nature Materials
https://www.readbyqxmd.com/read/28603958/novel-biocompatible-thermo-responsive-poly-n-vinyl-caprolactam-clay-nanocomposite-hydrogels-with-macro-porous-structure-and-improved-mechanical-characteristics
#7
Kun Shi, Zhuang Liu, Chao Yang, Xiao-Ying Li, Yi-Min Sun, Yi Deng, Wei Wang, Xiao-Jie Ju, Rui Xie, Liang-Yin Chu
Poly(N-vinyl caprolactam) (PVCL) hydrogels usually suffer from the imporous structure and poor mechanical characteristics as well as the toxicity of crosslinkers, although PVCL itself is biocompatible. In this paper, novel biocompatible thermo-responsive poly(N-vinyl caprolactam)/clay nanocomposite (PVCL-Clay) hydrogels with macro-porous structure and improved mechanical characteristics are developed for the first time. The macro-porosity in the hydrogel is introduced by using Pickering emulsions as templates, which contain N-vinyl caprolactam (VCL) monomer as dispersed phase and clay sheets as stabilizers at the interface...
June 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28601745/synthesis-of-poly-diallyldimethylammonium-capped-copper-hexacyanoferrate-cuhcf-nanoparticles-an-efficient-stabiliser-for-pickering-emulsions
#8
Martin Mayer, Dmytro Dedovets, Yannick Guari, Joulia Larionova, Jérôme Long, Jérémy Causse
Poly(diallyldimethylammonium chloride) (PDDA) capped copper hexacyanoferrate nanoparticles (CuHCF NPs) with the controlled size are prepared following a precipitation method. While PDDA and CuHCF are not active at the cyclohexane/water interface, PDDA capped CuHCF NPs present synergistic property permitting them to stabilise oil-in-water emulsions for weeks. These latter can be considered as promising precursors for the development of new porous materials considering the fact that the NPs present some interests in the field of nuclear decontamination...
June 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28588490/an-overview-of-pickering-emulsions-solid-particle-materials-classification-morphology-and-applications
#9
REVIEW
Yunqi Yang, Zhiwei Fang, Xuan Chen, Weiwang Zhang, Yangmei Xie, Yinghui Chen, Zhenguo Liu, Weien Yuan
Pickering emulsion, a kind of emulsion stabilized only by solid particles locating at oil-water interface, has been discovered a century ago, while being extensively studied in recent decades. Substituting solid particles for traditional surfactants, Pickering emulsions are more stable against coalescence and can obtain many useful properties. Besides, they are more biocompatible when solid particles employed are relatively safe in vivo. Pickering emulsions can be applied in a wide range of fields, such as biomedicine, food, fine chemical synthesis, cosmetics, and so on, by properly tuning types and properties of solid emulsifiers...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28578961/novel-nano-particulated-exopolysaccharide-produced-by-klebsiella-sp-phrc1-001
#10
Meng Zhao, Nana Cui, Fangning Qu, Xue Huang, Hao Yang, Shaoping Nie, Xueqiang Zha, Steve W Cui, Katsuyoshi Nishinari, Glyn O Phillips, Yapeng Fang
In recent decades, microbial synthesis of polysaccharides with special functional properties has attracted increasing attention. This work reported a novel exopolysaccharide (EPS)-producing strain, Klebsiella sp. PHRC1.001 isolated from activated sludge. Physicochemical, rheological, emulsifying and toxicological properties of the obtained EPS were characterized. The EPS was mainly composed of d-glucose and l-arabinose, and was found to exist in aqueous solution in a nano-particulated form (∼50nm in diameter) with a strong tendency of aggregation...
September 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28574273/breathable-microgel-colloidosome-gas-switchable-microcapsules-with-o2-and-co2-tunable-shell-permeability-for-hierarchical-size-selective-control-release
#11
Lei Lei, Qi Zhang, Shuxian Shi, Shiping Zhu
Microcapsules enabling precise delivery and controlled release are highly desirable. However, it is still challenging to control the release profile by regulating the microcapsule shell permeability. In this work, gas-switchable microgel colloidosome (MGC) with oxygen (O2) and carbon dioxide (CO2) dual gas-tunable shell permeability has been developed and tested for control release of water-soluble cargo molecules, based on the size exclusion mechanism. The O2 and CO2 dual gas-switchable poly(2-(diethylamino)ethyl methacrylate-co-2,3,4,5,6-pentafluorostyrene), P(DEA-co-FS), microgels having surface modified with amino group (-NH2) were synthesized and used to stabilize oil-in-water (O/W) Pickering emulsions...
June 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28551245/characterizations-of-pickering-emulsions-stabilized-by-starch-nanoparticles-influence-of-starch-variety-and-particle-size
#12
Shengju Ge, Liu Xiong, Man Li, Jing Liu, Jie Yang, Ranran Chang, Caifeng Liang, Qingjie Sun
Pickering emulsions were first successfully fabricated by different types and sizes of corn, tapioca, sweet potato, and waxy corn starch nanoparticles as stabilizers. Photography, optical microscopy, confocal laser scanning microscopy, and rheology measurements were used to characterize Pickering emulsions stabilized by various starch nanoparticles. The results showed that tapioca, sweet potato, and corn starch nanoparticles were appropriate for Pickering emulsion stabilization because the three nanoparticles have nearly neutral wettability (θow ∼90°)...
November 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28544915/pyrrole-based-poly-ionic-liquids-as-efficient-stabilizers-for-formation-of-hollow-multi-walled-carbon-nanotubes-particles
#13
Prithwish Chatterjee, Elizabeth M Nofen, Wenwen Xu, Conrad Hom, Hanqing Jiang, Lenore L Dai
Poly(ionic liquid) (PIL) derivatives with pyrrole intrinsically conducting polymer (ICP) backbones were synthesized and utilized as novel dispersants of multi-walled carbon nanotubes (MWCNTs) in various aqueous and non-aqueous systems, including polar and nonpolar solvents. This is due to the highly tunable nature of the PIL, in which the PILs of varying polarity with the same pyrrole-based polycation can be synthesized. The dispersions are exceedingly stable over many months, and with the addition of hexane, Pickering (solid-stabilized) emulsions with the PIL-stabilized MWCNTs at the droplet interfaces were formed...
April 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28541052/janus-particles-templated-by-janus-emulsions-and-application-as-a-pickering-emulsifier
#14
Duo Wei, Lingling Ge, Shuhui Lu, Jingjing Li, Rong Guo
One-step vibrational mixing has afforded the batch-scale preparation of a Janus emulsion. The fabrication of Janus particles (JPs) templated by Janus emulsions was motivated by the topology and composition of the Janus droplets being highly tunable and controllable. Two immiscible polymerizable monomers were introduced as inner phases of the Janus emulsion. The advanced geometry of the resultant JPs was easily and precisely controlled from "snowman" to "dumbbell" by adjusting the mass ratio of two oils in the initial emulsion...
June 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28513748/development-of-stable-pickering-emulsions-oil-powders-and-pickering-hipes-stabilized-by-gliadin-chitosan-complex-particles
#15
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/thermoresponsive-pickering-emulsions-stabilized-by-silica-nanoparticles-in-combination-with-alkyl-polyoxyethylene-ether-nonionic-surfactant
#16
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 thermoresponsive 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 rehomogenized, and this stabilization-destabilization behavior can be cycled many times...
May 26, 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
#17
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
#18
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
#19
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
#20
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 micrometer-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 18, 2017: ACS Applied Materials & Interfaces
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