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Pickering emulsion

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https://www.readbyqxmd.com/read/28088118/histidine-functionalized-carbon-based-dot-zinc-ii-nanoparticles-as-a-novel-stabilizer-for-pickering-emulsion-synthesis-of-polystyrene-microspheres
#1
Li Ruiyi, Li Zaijun, Liu Junkang
Carbon-based dots (CDs) are nanoparticles with size-dependent optical and electronic properties that have been widely applied in energy-efficient displays and lighting, photovoltaic devices and biological markers. However, conventional CDs are difficult to be used as ideal stabilizer for Pickering emulsion due to its irrational amphiphilic structure. The study designed and synthesized a new histidine-functionalized carbon dot-Zinc(II) nanoparticles, which is termed as His-CD-Zn. The His-CD was made via one-step hydrothermal treatment of histidine and maleic acid...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28068054/fabrication-of-active-surfaces-with-metastable-microgel-layers-formed-during-breath-figure-templating
#2
Yuchen Zhou, Junjie Huang, Wei Sun, Yuanlai Ju, Pinghui Yang, Lingyun Ding, Zhongren Chen, Julia A Kornfield
Patterned porous surfaces with responsive functionalities are fabricated by a thermo-responsive microgel-assisted breath figure (BF) process. When water droplets submerge into a polystyrene (PS) solution during formation of a porous surface by the bottom-up BF process, poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AA) microgels dispersed in the solution spontaneously assemble at the water-organic interfaces like "Pickering emulsions", reinforced by capillary flow. The conformal layer of PNIPAm-co-AA microgels lining the pores appears in images of scanning electron microscope (SEM) either as a smooth surface layer (L) or as an array of dome-like protrusions (D), depending on the conditions at which the sample was dried for SEM...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28064491/dependence-of-the-internal-structure-on-water-particle-volume-ratio-in-an-amphiphilic-janus-particle-water-oil-ternary-system-from-micelle-like-clusters-to-emulsions-of-spherical-droplets
#3
Tomohiro G Noguchi, Yasutaka Iwashita, Yasuyuki Kimura
Amphiphilic Janus particles (AJP), composed of hydrophilic and hydrophobic hemispheres, are one of the simplest anisotropic colloids, and they exhibit higher surface activities than particles with homogeneous surface properties. Consequently, a ternary system of AJP, water and oil can form extremely stable Pickering emulsions, with internal structures that depend on the Janus structure of the particles and the system composition. However, the detail of these structures has not been fully explored, especially for the composition range where the amount of the minority liquid phase and AJP are comparable, where one would expect the Janus characteristics to be directly reflected...
January 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28064487/gelatin-particle-stabilized-high-internal-phase-emulsions-for-use-in-oral-delivery-systems-protection-e%C3%AF-ect-and-in-vitro-digestion-study
#4
Huan Tan, Lifeng Zhao, Sisi Tian, Hui Wen, Xiaojun Gou, To Ngai
The potential application of Pickering high internal phase emulsions (HIPEs) in the food and pharmaceutical industries has yet to be fully developed. Herein, we synthesized fairly monodispersed, non-toxic, auto-fluorescent gelatin particles for use as sole stabilizers to fabricate oil-in-water (O/W) HIPEs in an effort to improve the protection and bioaccessibility of entrapped β-carotene. Our results showed that the concentration of gelatin particles determined the formation, microstructure, droplet size distribution, and digestion profile of the HIPEs...
January 8, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28052674/dye-aggregates-as-new-stabilizers-for-mini-emulsions
#5
Susanne Sihler, Ulrich Ziener
Water-soluble organic dyes like fluorescein are widely used, mainly for coloration of e.g. biological samples, groundwater tracing etc., and they are not obviously amphiphilic by molecular structure like surfactants. Here, we show that the dyes alone stabilize oil-in-water emulsions. Exemplarily, fluorescein is compared with the classical surfactant sodium dodecyl sulfate (SDS) by means of surface/interfacial tension, concentration of stabilizer and electrolyte as well as pH. The principle can be extended to further classes of water-soluble dyes, which keep up with or exceed SDS by efficiency...
January 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28032975/thermosensitive-zrp-pnipam-pickering-emulsifier-and-the-controlled-release-behavior
#6
Xuezhen Wang, Minxiang Zeng, Yi-Hsien Yu, Huiliang Wang, M Sam Mannan, Zhengdong Cheng
Asymmetric Janus and Gemini ZrP-PNIPAM monolayer nanoplatelets were obtained by exfoliation of two-dimensional layered ZrP disks whose surface was covalently modified with thermosensitive polymer PNIPAM. The nanoplatelets largely reduced interfacial tension (IFT) of the oil/water interface so that they were able to produce stable oil/water emulsions, and the PNIPAM grafting either on the surface or the edge endowed the nanoplatelets rapid temperature response. The ZrP-PNIPAM nanoplatelets proved to be thermosensitive Pickering emulsifiers for controlled-release applications...
December 29, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28004460/a-surfactant-free-and-shape-controlled-synthesis-of-nonspherical-janus-particles-with-thermally-tunable-amphiphilicity
#7
Ji Hoon Park, Nuri Han, Ji Eun Song, Eun Chul Cho
A surfactant-free approach is proposed to synthesize nonspherical Janus particles with temperature-dependent wettability on hydrophobic surfaces. Sub-micrometer-sized particles comprising poly(styrene-co-divinylbenzene) core and a thermally responsive poly(N-isopropylacrylamide-co-methacrylic acid) shell are first synthesized to stabilize styrene droplets in water, producing a Pickering emulsion. Upon heating to 80 °C and subsequent addition of initiators to the aqueous phase, styrene droplets are polymerized and combine with the core-shell particles to construct dumbbell-shaped nonspherical particles...
December 22, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/27993026/particulate-coacervation-of-associative-polymer-brushes-grafted-nanoparticles-to-produce-structurally-stable-pickering-emulsions
#8
Taeseung Yang, Sang Koo Choi, Daehwan Park, Yea Ram Lee, Chan Bok Chung, Jin Woong Kim
This study introduces a new type of associative nanoparticle (ANP) that provides controlled chain-to-chain attraction with an associative polymer rheology modifier (APRM) to produce highly stable Pickering emulsions. The ANPs were synthesized by grafting hydrophobically modified hygroscopic zwitterionic poly(2-methacryloyloxyethyl phosphorylcholine-co-stearyl methacrylate) brushes onto 20 nm sized silica NPs via surface-mediated living radical polymerization. The ANP-stabilized Pickering emulsions show significant viscosity enhancement in the presence of the APRM...
December 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27991634/interfacial-properties-and-emulsification-performance-of-thylakoid-membrane-fragments
#9
A Tamayo Tenorio, E W M de Jong, C V Nikiforidis, R M Boom, A J van der Goot
Thylakoids membranes are sophisticated, dynamic structures found in plant leaves, composed of protein complexes in a dynamic lipid matrix. The interfacial absorption dynamics and viscoelasticity of thylakoid membranes fragments were measured to assess the properties of the interfacial layer and to elucidate an emulsifying mechanism that includes the role of thylakoid's composition and 3D structure. Thylakoid membranes were extracted from sugar beet leaves by a series of buffer washing, filtration and centrifugation...
December 19, 2016: Soft Matter
https://www.readbyqxmd.com/read/27987970/a-facile-and-green-emulsion-casting-method-to-prepare-chitin-nanocrystal-reinforced-citrate-based-bioelastomer
#10
Xin Wang, Kai Liang, Yaling Tian, Yali Ji
Chitin nanocrystal (ChiNC) is a promising reinforcing nanofiller for biomedical polymers. However, its self-aggregation characteristics caused processing difficulty in developing ChiNC-based nanocomposites. Herein, a new degradable crosslinked bioelastomer, designated as poly(1,8-octanediol-co-Pluronic F127 citrate) (POFC) was synthesized by melt polycondensation of citric acid, 1,8-octanediol, and Pluronic F127. In comparison to poly(1,8-octanediol citrate) (POC), POFC pre-polymer exhibited self-emulsifying property...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987962/production-of-starch-nanoparticles-by-dissolution-and-non-solvent-precipitation-for-use-in-food-grade-pickering-emulsions
#11
Hisfazilah Saari, Catalina Fuentes, Malin Sjöö, Marilyn Rayner, Marie Wahlgren
The aim of this study was to investigate non-solvent precipitation of starch to produce nanoparticles that could be used in Pickering emulsions. The material used was waxy maize, modified with octenyl succinic anhydride. Different methods of non-solvent precipitation were investigated, and a method based on direct mixing of an 8% starch solution and ethanol (ratio 1:1) was found to produce the smallest particles. The particle size was measured using AFM and AF4, and was found to be in the range 100-200nm. However, both larger particles and aggregates of nanoparticles were observed...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987738/fabrication-and-evaluation-of-chitosan-nayf4-yb-3-tm-3-upconversion-nanoparticles-composite-beads-based-on-the-gelling-of-pickering-emulsion-droplets
#12
Huiqiong Yan, Xiuqiong Chen, Jia Shi, Zaifeng Shi, Wei Sun, Qiang Lin, Xianghui Wang, Zihao Dai
The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF4:Yb(3+)/Tm(3+) UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF4:Yb(3+)/Tm(3+) composite beads (CS/NaYF4:Yb(3+)/Tm(3+) CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF4:Yb(3+)/Tm(3+) UCNPs with an average size of 20nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27958712/facile-route-to-transparent-strong-and-thermally-stable-nanocellulose-polymer-nanocomposites-from-an-aqueous-pickering-emulsion
#13
Shuji Fujisawa, Eiji Togawa, Katsushi Kuroda
Cellulose nanofibril (CNF) is a promising nanofiller for polymer nanocomposite materials, and a critical challenge in designing these materials is organization of the nanostructure using a facile process. Here, we report a facile aqueous preparation process for nanostructured polystyrene (PS)/CNF composites via the formation of a CNF-stabilized Pickering emulsion. PS nanoparticles, with a narrow size distribution, were synthesized by free radical polymerization in water using CNF as a stabilizer. The nanoparticles were easily collected by filtration, and the resulting material had a composite structure of PS nanoparticles embedded in a CNF framework...
December 21, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27951712/pore-structure-of-macroporous-polymers-using-polystyrene-silica-composite-particles-as-pickering-stabilizers
#14
Shuhua Tu, Chenxu Zhu, Lingyun Zhang, Haitao Wang, Qiangguo Du
A novel approach for the preparation of interconnected macroporous polymers with a controllable pore structure was reported. The method was based on the polymerization of water-in-oil Pickering high internal phase emulsion (HIPE) stabilized by polystyrene (PS)/silica composite particles. The composite Pickering stabilizers were facilely obtained by mixing positively charged PS microspheres and negatively charged silica nanoparticles, and their amphiphilicity could be delicately tailored by varying the ratio of PS and silica...
December 13, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27951708/dynamics-of-pickering-emulsions-in-the-presence-of-an-interfacial-reaction-a-simulation-study
#15
Shuangliang Zhao, Bicai Zhan, Yaofeng Hu, Zhaoyu Fan, Marc Pera-Titus, Honglai Liu
Pickering emulsions combining surface-active and catalytic properties offer a promising platform for conducting interfacial reactions between immiscible reagents. Despite the significant progress in the design of Pickering interfacial catalysts for a broad panel of reactions, the dynamics of Pickering emulsions under reaction conditions is still poorly understood. Herein, using benzene hydroxylation with aqueous H2O2 as a model system, we explored the dynamics of benzene/water Pickering emulsions during reaction by dissipative particle dynamics...
December 13, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27935304/pickering-and-network-stabilization-of-biocompatible-emulsions-using-chitosan-modified-silica-nanoparticles
#16
Lauriane Alison, Patrick A Rühs, Elena Tervoort, Alexandra Teleki, Michele Zanini, Lucio Isa, André R Studart
Edible solid particles constitute an attractive alternative to surfactants as stabilizers of food-grade emulsions for products requiring a long-term shelf life. Here, we report on a new approach to stabilize edible emulsions using silica nanoparticles modified by noncovalently bound chitosan oligomers. Electrostatic modification with chitosan increases the hydrophobicity of the silica nanoparticles and favors their adsorption at the oil-water interface. The interfacial adsorption of the chitosan-modified silica particles enables the preparation of oil-in-water emulsions with small droplet sizes of a few micrometers through high-pressure homogenization...
December 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27933833/tunable-pickering-emulsions-with-environmentally-responsive-hairy-silica-nanoparticles
#17
Min Liu, Xiaoli Chen, Zongpeng Yang, Zhou Xu, Liangzhi Hong, To Ngai
Surface modification of the nanoparticles using surface anchoring of amphiphilic polymers offers considerable scope for the design of a wide range of brush-coated hybrid nanoparticles with tunable surface wettability that may serve as new class of efficient Pickering emulsifiers. In the present study, we prepared mixed polymer brush-coated nanoparticles by grafting ABC miktoarm star terpolymers consisting of poly(ethylene glycol), polystyrene, and poly[(3-triisopropyloxysilyl)propyl methacrylate] (μ-PEG-b-PS-b-PIPSMA) on the surface of silica nanoparticles...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27858037/dual-responsive-pickering-emulsions-stabilized-by-constructed-core-crosslinked-polymer-nanoparticles-via-reversible-covalent-bonds
#18
Huazhang Guo, Duanguang Yang, Mei Yang, Yong Gao, Yijiang Liu, Huaming Li
In this study, pH- and glucose-responsive Pickering emulsions stabilized by core crosslinked polymer nanoparticles, which were constructed via reversible covalent bonds, were presented for the first time. Firstly, well-defined PDMA-b-PAPBA (poly(N,N-dimethylacrylamide)-b-poly(3-acrylamidophenylboronic acid)) diblock copolymers were synthesized via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization reactions. By means of complexation of PBA units of PDMA-b-PAPBA with PVA in basic water, core crosslinked polymer nanoparticles (CCPNs) with a core-shell structure were formed...
December 6, 2016: Soft Matter
https://www.readbyqxmd.com/read/27808336/magnetically-active-pickering-emulsions-stabilized-by-hybrid-inorganic-organic-networks
#19
Jeniree A Flores, Ashlee A Jahnke, Adriana Pavia-Sanders, Zhengdong Cheng, Karen L Wooley
Magnetically-active hybrid networks (MHNs) are complex inorganic/organic composite materials that have been synthesized from the coupling of amine-functionalized iron oxide nanoparticles (amine-IONs) and pre-assembled shell crosslinked knedel-like (SCK) polymeric nanoconstructs. The intricate structure of these materials is composed of several inter-connected bundles of SCKs covalently bound to amine-IONs, which afford them magnetic responsivity. The MHNs were originally designed to sequester complex hydrocarbons from water; however, they have displayed a remarkable ability to form stable Pickering emulsions between organic solvents and water, upon mechanical stimulus...
November 3, 2016: Soft Matter
https://www.readbyqxmd.com/read/27795581/abc-triblock-copolymer-worms-synthesis-characterization-and-evaluation-as-pickering-emulsifiers-for-millimeter-sized-droplets
#20
C J Mable, K L Thompson, M J Derry, O O Mykhaylyk, B P Binks, S P Armes
Polymerization-induced self-assembly (PISA) is used to prepare linear poly(glycerol monomethacrylate)-poly(2-hydroxypropyl methacrylate)-poly(benzyl methacrylate) [PGMA-PHPMA-PBzMA] triblock copolymer nano-objects in the form of a concentrated aqueous dispersion via a three-step synthesis based on reversible addition-fragmentation chain transfer (RAFT) polymerization. First, GMA is polymerized via RAFT solution polymerization in ethanol, then HPMA is polymerized via RAFT aqueous solution polymerization, and finally BzMA is polymerized via "seeded" RAFT aqueous emulsion polymerization...
October 25, 2016: Macromolecules
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