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Pickering emulsion

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https://www.readbyqxmd.com/read/28334512/flow-pickering-emulsion-interfaces-enhance-catalysis-efficiency-and-selectivity-for-cyclization-of-citronellal
#1
Hengquan Yang, Huan Chen, Houbing Zou, Yajuan Hao
Cyclization of citronellal is a necessary intermediate step to produce the important flavor chemical (-)-menthol. We here demonstrate a continuous flow Pickering emulsion (FPE) strategy for selective cyclization of citronellal to (-)-isopulegol, using water droplets hosting heteropolyacid catalyst (HPA) to fill a column reactor. Owing to the large liquid-liquid interface and the excellent confinement capability of droplets toward HPA, the FPE system exhibits a catalysis efficiency much higher than those of batch systems (2~5 fold) and an excellent durability (two months)...
March 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28322471/synthesis-of-naproxen-imprinted-polymer-using-pickering-emulsion-polymerization
#2
Małgorzata Kujawska, Tongchang Zhou, Andrzej W Trochimczuk, Lei Ye
For the last decades, molecular imprinting is developing intensively, especially in the case of the application of new imprinting techniques. In this work, for the first time, a Pickering emulsion polymerization was used to synthesize the S-naproxen-imprinted polymer spheres following a noncovalent protocol. To enhance the knowledge about imprinting process using mentioned technique, thorough analysis of the synthesis process was performed. Optimization of polymerization conditions included the selection of functional monomer, cross-linking agent, type of porogen, surfactant, and the choice of appropriate amount of the template and porogen...
March 21, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/28306753/non-monotonic-dependence-of-pickering-emulsion-gel-rheology-on-particle-volume-fraction
#3
M Kaganyuk, A Mohraz
The microstructure of Pickering emulsion gels features a tenuous network of faceted droplets, bridged together by shared monolayers of particles. In this investigation, we use standard oscillatory rheometry in conjunction with confocal microscopy to gain a more comprehensive understanding of the role particle bridged interfaces have on the rheology of Pickering emulsion gels. The zero-shear elastic modulus of Pickering emulsion gels shows a non-monotonic dependence on particle loading, with three separate regimes of power-law and linear gel strengthening, and subsequent gel weakening...
March 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28306209/crab-chitin-based-2d-soft-nanomaterials-for-fully-biobased-electric-devices
#4
Jun You, Mingjie Li, Beibei Ding, Xiaochen Wu, Chaoxu Li
2D nanomaterials have various size/morphology-dependent properties applicable in electronics, optics, sensing, and actuating. However, intensively studied inorganic 2D nanomaterials are frequently hindered to apply in some particular and industrial fields, owing to harsh synthesis, high-cost, cytotoxicity, and nondegradability. Endeavor has been made to search for biobased 2D nanomaterials with biocompatibility, sustainability, and biodegradability. A method of hydrophobization-induced interfacial-assembly is reported to produce an unprecedented type of nanosheets from marine chitin...
March 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28290652/protein-nanocage-as-a-ph-switchable-pickering-emulsifier
#5
Mridul Sarker, Nikodem Tomczak, Sierin Lim
Encapsulation of active compounds in Pickering emulsions using bioderived protein-based stabilizers holds potential for the development of novel formulations in the fields of foods and cosmetics. We employ a dodecahedron hollow protein nanocage as a pH-switchable Pickering emulsifier. E2 protein nanocages are derived from pyruvate dehydrogenase multienzyme complex from Geobacillus stearothermophilus which adsorb at the oil/water interface at neutral and basic pH's and stabilize the Pickering emulsions, while in the acidic range, at pH ∼4, the emulsion separates into emulsion and serum phases due to flocculation...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28274435/octenylsuccinate-starch-spherulites-as-a-stabilizer-for-pickering-emulsions
#6
Chan Wang, Xiong Fu, Chuan-He Tang, Qiang Huang, Bin Zhang
This study investigated structure and morphology of starch spherulites prepared from debranched waxy maize and waxy potato starches. Debranched waxy potato starch favored the formation of B-type crystals with longer branch chains (average chain length, 26.14), whereas A-type polymorphic aggregates were generated from debranched waxy maize under same recrystallization condition. Spherulites had smaller particle size distribution (D[3,2], ∼3.7μm), higher dissociation temperature (80-120°C) and crystallinity (80∼90%), compared to native waxy starches...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28255892/generation-of-janus-molecularly-imprinted-polymer-particles
#7
Xiantao Shen, Chuixiu Huang, Lei Ye
Janus particles, which have two or more distinct physical surfaces, provide a number of potential applications in many fields. However, it is difficult to selectively load chemical or biological components onto the Janus particles. Here, the approach utilizing molecular imprinting and Pickering emulsion technologies for the synthesis of molecularly imprinted polymer (MIP)-based Janus particles (which showed high affinity to the targets) is described stepwise. As self-propelled microengines possessing specific molecular recognition ability, Janus molecularly imprinted polymer particles show high potential for specific and well-controlled drug delivery...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28230870/colloidal-capsules-nano-and-microcapsules-with-colloidal-particle-shells
#8
REVIEW
Tobias Bollhorst, Kurosch Rezwan, Michael Maas
Utilizing colloidal particles for the assembly of the shell of nano- and microcapsules holds great promise for the tailor-made design of new functional materials. Increasing research efforts are devoted to the synthesis of such colloidal capsules, by which the integration of modular building blocks with distinct physical, chemical, or morphological characteristics in a capsule's shell can result in novel properties, not present in previous encapsulation structures. This review will provide a comprehensive overview of the synthesis strategies and the progress made so far of bringing nano- and microcapsules with shells of densely packed colloidal particles closer to application in fields such as chemical engineering, materials science, or pharmaceutical and life science...
February 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28221001/synthesis-of-dual-stimuli-responsive-microcontainers-with-two-payloads-in-different-storage-spaces-for-preprogrammable-release
#9
Ying Cong, Qiuju Li, Min Chen, Limin Wu
Stimuli-responsive microcontainers have become a major topic of interest, from fundamental aspects to applications in materials science. However, microcontainers that enable the loading of multiple species and programmable release are mostly unexplored. Herein, we describe the design and synthesis of a dual-responsive organic/inorganic hybrid microcontainer with two payloads in separate storage spaces that is formed by the rapid UV-initiated polymerization of Pickering emulsions. The stellate mesopore silica nanoparticles with poly(N-isopropylacrylamide) grafted inside the mesopores were loaded with one compound (Nile red) and used as Pickering emulsifiers to stabilize oil-in-water droplets...
February 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28219622/particles-adsorbed-at-various-non-aqueous-liquid-liquid-interfaces
#10
REVIEW
Miguel Angel Fernandez-Rodriguez, Bernard P Binks, Miguel Angel Rodriguez-Valverde, Miguel Angel Cabrerizo-Vilchez, Roque Hidalgo-Alvarez
Particles adsorbed at liquid interfaces are commonly used to stabilise water-oil Pickering emulsions and water-air foams. The fundamental understanding of the physics of particles adsorbed at water-air and water-oil interfaces is improving significantly due to novel techniques that enable the measurement of the contact angle of individual particles at a given interface. The case of non-aqueous interfaces and emulsions is less studied in the literature. Non-aqueous liquid-liquid interfaces in which water is replaced by other polar solvents have properties similar to those of water-oil interfaces...
February 7, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28195458/tuning-the-interfacial-activity-of-mesoporous-silicas-for-biphasic-interface-catalysis-reactions
#11
Fen Xue, Yabin Zhang, Fengwei Zhang, Xiaomin Ren, Hengquan Yang
Interface-active particle materials that are able to assemble at the oil/water interface so as to stabilize droplets, are gaining unprecedented interest due to the intriguing applications in catalysis and materials synthesis, etc. In contrast to these potential applications, this kind of materials are still limited and cannot meet some particular demands of practical utilizations such as rationally designed interfacial activity and high stability against concentrated salts. In this contribution, interface-active mesoporous silica nanospheres (MSS@CxZy) are synthesized through simultaneous incorporation of extremely hydrophilic zwitterionic moiety and hydrophobic octyl moiety in the shell...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28194044/influence-of-mixing-conditions-on-the-rheological-properties-and-structure-of-capillary-suspensions
#12
Frank Bossler, Lydia Weyrauch, Robert Schmidt, Erin Koos
The rheological properties of a suspension can be dramatically altered by adding a small amount of a secondary fluid that is immiscible with the bulk liquid. These capillary suspensions exist either in the pendular state where the secondary fluid preferentially wets the particles or the capillary state where the bulk fluid is preferentially wetting. The yield stress, as well as storage and loss moduli, depends on the size and distribution of secondary phase droplets created during sample preparation. Enhanced droplet breakup leads to stronger sample structures...
April 5, 2017: Colloids and Surfaces. A, Physicochemical and Engineering Aspects
https://www.readbyqxmd.com/read/28191963/ph-responsive-pickering-emulsions-stabilized-by-silica-nanoparticles-in-combination-with-a-conventional-zwitterionic-surfactant
#13
Kaihong Liu, Jianzhong Jiang, Zhenggang Cui, Bernard P Binks
pH-responsive oil-in-water Pickering emulsions were prepared simply by using negatively charged silica nanoparticles in combination with a trace amount of a zwitterionic carboxyl betaine surfactant as stabilizer. Emulsions are stable to coalescence at pH ≤ 5 but phase separate completely at pH > 8.5. In acidic solution, the carboxyl betaine molecules become cationic, allowing them to adsorb on silica nanoparticles via electrostatic interactions, thus hydrophobizing and flocculating them and enhancing their surface activity...
February 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28159255/amorphous-nano-curcumin-stabilized-oil-in-water-emulsion-physico-chemical-characterization
#14
N P Aditya, Ian E Hamilton, Ian T Norton
Particle characteristics e.g. size and polymorphism are known to significantly affect the Pickering ability of the solid particles by influencing their interaction at the oil and water (O/W) interface. In this study, nano-sized amorphous curcumin particles were fabricated using nanonization technology to use them as Pickering particles. After nanonization, native crystalline curcumin particles were converted into amorphous, nanosized particles of ∼220nm. Amorphous nature of the particle was evident from the decreased melting point from 177±1°C (native curcumin) to 146±3°C (nanonized curcumin) and enthalpy from 27±2J/g to 3...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28145435/processable-high-internal-phase-pickering-emulsions-using-depletion-attraction
#15
KyuHan Kim, Subeen Kim, Jiheun Ryu, Jiyoon Jeon, Se Gyu Jang, Hyunjun Kim, Dae-Gab Gweon, Won Bin Im, Yosep Han, Hyunjung Kim, Siyoung Q Choi
High internal phase emulsions have been widely used as templates for various porous materials, but special strategies are required to form, in particular, particle-covered ones that have been more difficult to obtain. Here, we report a versatile strategy to produce a stable high internal phase Pickering emulsion by exploiting a depletion interaction between an emulsion droplet and a particle using water-soluble polymers as a depletant. This attractive interaction facilitating the adsorption of particles onto the droplet interface and simultaneously suppressing desorption once adsorbed...
February 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28132504/gelatin-based-nanocomplex-stabilized-pickering-emulsions-regulating-droplet-size-and-wettability-through-assembly-with-glucomannan
#16
Weiping Jin, Jieyu Zhu, Yike Jiang, Ping Shao, Bin Li, Qingrong Huang
Particle size and surface wettability play leading roles in the distribution of particles on the oil-water interface and the stability of emulsions. This work utilized nanocomplexes assembled from gelatin and tannic acid to stabilize Pickering emulsions. The sizes and surface wettability of particles were further regulated by using a polysaccharide. The sizes of nanocomplexes ranged from 205.8 to 422.2 nm and increased with the addition of polysaccharide. Their contact angles decreased from 84.1° to 59.3°, revealing their hydrophilic nature...
February 10, 2017: Journal of Agricultural and Food Chemistry
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
#17
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
#18
Yuchen Zhou, Junjie Huang, Wei Sun, Yuanlai Ju, Pinghui Yang, Lingyun Ding, Zhong-Ren Chen, Julia A Kornfield
Patterned porous surfaces with responsive functionalities are fabricated by a thermoresponsive 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 from a scanning electron microscope (SEM) either as a smooth surface layer (L) or as an array of domelike protrusions (D), depending on the conditions at which the sample was dried for SEM...
February 1, 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
#19
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 19, 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-effect-and-in-vitro-digestion-study
#20
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 monodisperse, nontoxic, autofluorescent gelatin particles for use as sole stabilizers for fabricating 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...
February 1, 2017: Journal of Agricultural and Food Chemistry
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