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Pickering emulsion

Subir Kumar Biswas, Hironari Sano, Md Iftekhar Shams, Hiroyuki Yano
Achieving structural hierarchy and a uniform nanofiller dispersion simultaneously remains highly challenging for obtaining a robust polymer nanocomposite of immiscible components. In this study, a remarkably facile Pickering emulsification approach is developed to fabricate hierarchical composites of immiscible acrylic polymer and native cellulose nanofibers by taking advantage of the dual role of the nanofibers as both the emulsion stabilizer and polymer reinforcement. The composites feature a unique "reverse" nacre-like microstructure reinforced with well-dispersed two-tier hierarchical nanofiber network, leading to a synergistic high strength, modulus, and toughness (20, 50, and 53 times that of neat polymer, respectively), high optical transparency (89%), high flexibility and a drastically low thermal expansion (13 ppm/K, 1/15th of the neat polymer)...
August 16, 2017: ACS Applied Materials & Interfaces
Mohamed Soyeb Manga, David W York
Stirred cell membrane emulsification (SCME) has been employed to prepare concentrated Pickering oil in water emulsions solely stabilized by fumed silica nanoparticles. The optimal conditions under which highly stable and low polydispersity concentrated emulsions using the SCME approach are highlighted. Optimization of the oil flux rates and the paddle stirrer speeds are critical to achieving control over the droplet size and size distribution. Investigating the influence of oil volume fraction highlights the criticality of the initial particle loading in the continuous phase on the final droplet size and polydispersity...
August 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Sheida Hedjazi, Seyed Hadi Razavi
Cellulosic nanocrystals from different origins were made to stabilize the canthaxanthin (CTX) in pickering emulsion. Nanocrystals were obtained by hydrochloric acid hydrolysis. Dynamic light scattering (DLS) demonstrated that the length of solid particles were in the range of 112nm to 4000nm. AFM indicated the needle-like shape of the cotton cellulose nanocrystals (CCNs) and bacterial cellulose nanocrystals (BCNs) and also illustrated the thickness of the particles to be 6 and 7nm respectively. The crystallinity of both BCNs and CCNs was higher than the cellulose source they were isolated (CL: 75...
August 10, 2017: International Journal of Biological Macromolecules
Zhang Zhenqian, Susanne Sihler, Ulrich Ziener
HYPOTHESIS: Many solid particles have been used in Pickering stabilized (mini)emulsions. Stabilizing "particles" can be also formed in situ e.g. by aggregation of dye molecules as reported recently. Among the dyes sodium 2-hydroxy-5-[(E)-(4-nitrophenyl)diazenyl]benzoate (Alizarin Yellow R, (AYR)) is one of the best stabilizers. It is assumed to act as sole stabilizer also in heterophase polymerizations and offers a great potential for applications. EXPERIMENTS: Aqueous solutions of AYR in varying concentrations (0...
August 3, 2017: Journal of Colloid and Interface Science
Faiza Laredj-Bourezg, Marie-Alexandrine Bolzinger, Jocelyne Pelletier, Yves Chevalier
Surfactant-free biocompatible and biodegradable Pickering emulsions were investigated as vehicles for skin delivery of hydrophobic drugs. O/w emulsions of medium-chain triglyceride (MCT) oil droplets loaded with all-trans retinol as a model hydrophobic drug were stabilized by block copolymer nanoparticles: either poly(lactide)-block-poly(ethylene glycol) (PLA-b-PEG) or poly(caprolactone)-block-poly(ethylene glycol) (PCL-b-PEG). Those innovative emulsions were prepared using two different processes allowing drug loading either inside oil droplets or inside both oil droplets and non-adsorbed block copolymer nanoparticles...
August 9, 2017: International Journal of Pharmaceutics
Zhaocheng Wang, Sijia Gao, Xiangxiang Liu, Ye Tian, Man Wu, Zhongwei Niu
Pickering emulsion constructions on nanorods with high aspect ratio are a great challenge because of the geometry restrictions. On the basis of the theory that the stability of Pickering emulsion is highly dependent on the size and amphiphilicity of the nanoparticle at fluid interfaces, we report a novel strategy to fabricate long-time stable Pickering emulsion consisting of tobacco mosaic virus (TMV)-like nanorods through the programming self-assembly of TMV coat protein (TMVCP). The first step is the self-assembly of amphiphilic TMVCP at Pickering emulsion interfaces, and the second step is the in situ interfacial self-assembly of TMVCP into nanorods with increased particle size...
August 9, 2017: ACS Applied Materials & Interfaces
Yanhua Sun, Shian Zhong
In this work, a novel strategy was developed for the selective recognition of protein based on oil-in-water Pickering emulsions-hydrogels polymerization and interfacial imprinting method. For the first time, nanoscale trifunctional bovine hemoglobin (BHb) played three roles simultaneously during the process, including emulsifier, template protein and sacrificial material for further exposing recognition sites. Prior to acting as stabilizers, bovine hemoglobin colloidal particles (BCPs) were firstly prepared by acidification and heat denaturation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
Qing Bo Meng, Peng Yang, Tianyang Feng, Xuyang Ji, Qian Zhang, Daliang Liu, Shuyao Wu, Fuxin Liang, Zhaoliang Zheng, Xi-Ming Song
A type of ionic liquid functionalized high-aspect-ratio Janus SiO2 nanosheets (IL-Janus nanosheets), which possesses a side terminated by imidazolin salt groups and the opposite side terminated by phenyl groups, was prepared and its emulsification performance was investigated. The surface wettability of ionic liquid functionalized side could be tailored via simple anion exchanging, giving the amphiphilic or totally hydrophobic Janus nanosheets. The influence of several parameters including surface wettability, particle concentration, oil composition, oil-water ratio as well as initial location of the nanosheets on the stability, morphology and type of the Pickering emulsions (O/W or W/O) stabilized by the amphiphilic IL-Janus nanosheets was evaluated...
July 27, 2017: Journal of Colloid and Interface Science
Zhen Wang, Yapei Wang
Pickering emulsions with the use of particles as emulsifiers have been extensively used in scientific research and industrial production due to their edge in biocompatibility and stability compared with traditional emulsions. The control over Pickering emulsion stability and type plays a significant role in these applications. Among the present methods to build controllable Pickering emulsions, tuning the amphiphilicity of particles is comparatively effective and has attracted enormous attention. In this review, we highlight some recent advances in tuning the amphiphilicity of particles for controlling the stability and type of Pickering emulsions...
November 8, 2016: Materials
Joanne Gould, Guillermo Garcia-Garcia, Bettina Wolf
In this paper, we demonstrate the functionality and functionalisation of waste particles as an emulsifier for oil-in-water (o/w) and water-in-oil (w/o) emulsions. Ground coffee waste was chosen as a candidate waste material due to its naturally high content of lignin, a chemical component imparting emulsifying ability. The waste coffee particles readily stabilised o/w emulsions and following hydrothermal treatment adapted from the bioenergy field they also stabilised w/o emulsions. The hydrothermal treatment relocated the lignin component of the cell walls within the coffee particles onto the particle surface thereby increasing the surface hydrophobicity of the particles as demonstrated by an emulsion assay...
September 21, 2016: Materials
Robert T Woodward, François De Luca, Aled D Roberts, Alexander Bismarck
Carbon foams displaying hierarchical porosity and excellent surface areas of >1400 m²/g can be produced by the activation of macroporous poly(divinylbenzene). Poly(divinylbenzene) was synthesized from the polymerization of the continuous, but minority, phase of a simple high internal phase Pickering emulsion. By the addition of KOH, chemical activation of the materials is induced during carbonization, producing Pickering-emulsion-templated carbon foams, or carboHIPEs, with tailorable macropore diameters and surface areas almost triple that of those previously reported...
September 14, 2016: Materials
Xiaoma Fei, Lei Xia, Mingqing Chen, Wei Wei, Jing Luo, Xiaoya Liu
A series of alkyl chain modified graphene oxides (AmGO) with different alkyl chain length and content was fabricated using a reducing reaction between graphene oxide (GO) and alkyl amine. Then AmGO was used as a graphene-based particle emulsifier to stabilize Pickering emulsion. Compared with the emulsion stabilized by GO, which was oil-in-water type, all the emulsions stabilized by AmGO were water-in-oil type. The effects of alkyl chain length and alkyl chain content on the emulsion properties of AmGO were investigated...
August 26, 2016: Materials
Alexander Mikkelsen, Paul Dommersnes, Zbigniew Rozynek, Azarmidokht Gholamipour-Shirazi, Marcio da Silveira Carvalho, Jon Otto Fossum
Fluid drops coated with particles, so-called Pickering drops, play an important role in emulsion and capsule applications. In this context, knowledge of mechanical properties and stability of Pickering drops are essential. Here we prepare Pickering drops via electric field-driven self-assembly. We use direct current (DC) electric fields to induce mechanical stress on these drops, as a possible alternative to the use of, for example, fluid flow fields. Drop deformation is monitored as a function of the applied electric field strength...
April 21, 2017: Materials
Yahui Cai, Shun Yang, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu
A novel strategy was used to immobilize bacterial cells on the surface of functional polymer particles for the efficient adsorption and biodegradation of organics in wastewater. First, the bacterial cells were aggregated using a vinyl-containing pre-polymer, and the obtained bacteria-pre-polymer complex was then used as a particle stabilizer to construct a stable Pickering emulsion of functional cross-linking monomers and hydrophobic superparamagnetic iron oxide nanoparticles (the oil phase) in water. After polymerization, the bacteria-pre-polymer complex was covalently fixed to the surface of the polymer particles...
August 2, 2017: Nanoscale
Wenkai Wang, Amir H Milani, Zhengxing Cui, Mingning Zhu, Brian R Saunders
Colloidosomes are micrometer-sized hollow particles that have shells consisting of coagulated or fused colloid particles. Whilst many large colloidosomes with sizes well above 1.0 μm have been prepared there are fewer examples of sub-micrometer colloidosomes. Here, we establish a simple emulsion templating-based method for the preparation of robust sub-micrometer pH-responsive microgel colloidosomes. The colloidosomes are constructed from microgel particles based on ethyl acrylate and methacrylic acid with peripheral vinyl groups...
July 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Xue-Feng Zhu, Jie Zheng, Fu Liu, Chao-Ying Qiu, Wei-Feng Lin, Chuan-He Tang
The improvement of the freeze-thaw stability of emulsions by interfacial engineering has attracted increasing attention in recent years. The present work investigated the potential of using soy protein isolate (SPI) aggregate nanoparticles as the Pickering stabilizers to improve the freeze-thaw stability of the resultant emulsions. SPI nanoparticles with different particle sizes and surface properties were fabricated through heating the SPI solutions (at a constant protein concentration of 2%, w/v) at 95 °C for 15 min, by varying the ionic strength (I) in the range of 0-500 mM...
August 1, 2017: Food & Function
Marc Pera-Titus, Hui Shi, Bing Hong, Flora Fan
Aquivion® Perfluorosulfonic Superacid catalyzed efficiently the solvent-free hydrolysis of glyceryl trilaurate at 100 oC and ambient pressure via the genesis of stable Pickering emulsions.
July 25, 2017: ChemSusChem
Chunjie Xie, Teng Qiu, Jinglong Li, Heling Zhang, Xiaoyu Li, Xinlin Tuo
The direct synthesis of polymer microspheres modified by aramid nanofibers (ANFs) is an interesting challenge. This work describes a simple aqueous process to prepare polystyrene (PS)/ANF composite microspheres, where the specific ANF network was "dressed" on PS. ANF was derived from the copolymerization of terephthaloyl chloride, p-phenylene diamine, and methoxypolyethylene glycol and could be dispersed in water stably. We applied the as-synthesized ANF as a Pickering emulsifier in the o/w emulsion of styrene monomer...
August 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Archana Samanta, Sonam Takkar, Ritu Kulshreshtha, Bhanu Nandan, Rajiv K Srivastava
Functionalized matrices have been sought for their application in sensors, filtration, energy storage, catalysis, and tissue engineering. We report formation of an inorganic-organic composite matrix based on poly(ε-caprolactone) (PCL) functionalized with hydrophobically modified silica (m-silica) fabricated with reduced organic solvent usage. The matrix was obtained via electrospinning of a water-in-oil emulsion of PCL that was stabilized by judicious choice of m-silica as a Pickering agent resulting into an emulsifier free matrix...
August 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Lei Wang, Ping Wen, Xiaoman Liu, Yuting Zhou, Mei Li, Yudong Huang, Lin Geng, Stephen Mann, Xin Huang
Multi-compartmentalized biphasic proteinosomes were self-assembled using a single-step double Pickering emulsion procedure, and exploited for enzyme-mediated interfacial catalysis, polysaccharide shell templating, and hydrogel functionalization.
July 27, 2017: Chemical Communications: Chem Comm
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