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Pickering emulsion

Kurt Wood, Myron R Szewczuk, Dérick Rousseau, Ronald J Neufeld
Pickering emulsions are colloidal dispersions stabilized by particles that either migrate to, or are formed at, the oil-water interface during emulsification. Here, we fabricated and characterized Pickering water-in-oil emulsions where molten glycerol monostearate crystallized at the surface of micron-sized water droplets and formed protective solid shells. We tested this emulsion as a reservoir delivery platform for the sustained release of low molecular weight hydrophilic molecules including sodium chloride (NaCl) and sodium citrate as model compounds, and the therapeutic oseltamivir phosphate (OP), the delivery of which was the ultimate goal of this research...
February 27, 2018: Oncotarget
Syuuhei Komatsu, Yui Ikedo, Taka-Aki Asoh, Ryo Ishihara, Akihiko Kikuchi
Organic-inorganic CaCO3 capsules were prepared by crystallization of CaCO3 on Pickering emulsion prepared using coacervate droplets made from thermoresponsive and degradable poly(2-methylene-1,3-dioxepane-co-2-hydroxyethyl acrylate) (poly(MDO-co-HEA)) in sole aqueous medium. The diameters of CaCO3-based Pickering emulsion could be controlled by varying several parameters: diameter of CaCO3 powders, initial polymer concentration, and copolymer composition. The CaCO3 Pickering emulsion was able to load low-molecular-weight hydrophobic substances at temperatures above the lower critical solution temperature (LCST) due to formation of polymer-concentrated phases, i...
March 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Fotis Spyropoulos, Daniel Kurukji, Phil Taylor, Ian T Norton
Aside from single active microencapsulation, there is growing interest in designing structures for the co-encapsulation and co-delivery of multiple species. Although currently achievable within solid systems, significant challenges exist in realising such functionality in liquid formulations. The present study reports on a novel microstructural strategy that enables the co-encapsulation and co-release of two actives from oil-in-water emulsions. This is realised through the fabrication of sodium caseinate/chitosan (NaCAS/CS) complexes that in tandem function as encapsulants of one active (hydrophilic) but also as ('Pickering-like') stabilisers to emulsion droplets containing a secondary active (hydrophobic)...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Khaoula Lebdioua, Anne Aimable, Manuella Cerbelaud, Arnaud Videcoq, Claire Peyratout
HYPOTHESIS: Pickering emulsions were prepared using wax and silica submicronic particles (650 nm), as a first step towards the synthesis of Janus particles. Surfactants added to silica particles control the emulsion stability and particles arrangement, i.e. their penetration depth into the wax and their ability to form a monolayer. Thus, a systematic study of surfactants is proposed. EXPERIMENTS: Zeta potential measurements and sedimentation tests are conducted to evaluate interactions of two cationic (CTAB: hexadecyltrimethylammonium bromide and DDAB: didodecyldimethylammonium bromide) and two polymeric surfactants with silica surface...
March 7, 2018: Journal of Colloid and Interface Science
Miusi Shi, Ruiwen Yang, Qin Li, Kangle Lv, Richard J Miron, Jie Sun, Mei Li, Yufeng Zhang
Since the discovery of osteoinduction in the early 20th century, innovative biomaterials with osteoinductive potential have emerged as candidates for bone repair. Recently, artificial protocell models have demonstrated great potential for tissue regeneration. Herein, we developed artificial bioactive proto-osteocells by self-assembly of biodegradable biphasic-phosphate particles in the form of aqueous-bone morphogenetic protein 2 (BMP2)-containing pickering emulsions in corn oil to fulfill the release of BMP2 with controlled and local efficacy...
March 12, 2018: ACS Applied Materials & Interfaces
Sen Lin, Shiyong Sun, Ke Wang, Kexuan Shen, Biaobiao Ma, Yuquan Ren, Xiaoyu Fan
The bioinspired design and construction of enzyme@capsule microreactors with specific cell-like functionality has generated tremendous interest in recent years. Inspired by their fascinating complexity, scientists have endeavored to understand the essential aspects of a natural cell and create biomimicking microreactors so as to immobilize enzymes within the hierarchical structure of a microcapsule. In this study, simultaneous encapsulation of alcohol dehydrogenase (ADH) was achieved during the preparation of microcapsules by the Pickering emulsion method using amphiphilic modified TiO₂ nanoparticles (NPs) as building blocks for assembling the photocatalytic microcapsule membrane...
February 24, 2018: Nanomaterials
Bing Han, Wendi Xia, Kaining Liu, Fucong Tian, Ying Chen, Xiaoyan Wang, Fuxin Liang, Zhenzhong Yang
The amphiphilic monomer 2-hydroxyethyl methacrylate (HEMA) is widely used in dental adhesives as a priming component, especially for dentin bonding. It behaves as a compatibilizer between hydrophilic and hydrophobic components, and stabilizes the multi-component adhesive system. However, there are several drawbacks associated with using HEMA, such as water retention within the adhesive layer, hydrolysis in oral environments, and cytotoxicity. These drawbacks lead to the failure of tooth restoration and represent a heavy medical burden...
February 22, 2018: ACS Applied Materials & Interfaces
Frederic Deschamps, Kathleen R Harris, Laurence Moine, Weiguo Li, Lambros Tselikas, Thomas Isoardo, Robert J Lewandowski, Angelo Paci, Nicolas Huang, Thierry de Baere, Riad Salem, Andrew C Larson
PURPOSE: Biodegradable polylactic-co-glycolic acid (PLGA) nanoparticles can adsorb at the water/oil interface to stabilize the emulsion (forming Pickering-emulsion). The purpose of this study was to compare the release profiles of oxaliplatin from Pickering-emulsion and Lipiodol-emulsion. MATERIALS/METHODS: Pickering-emulsions and Lipiodol-emulsions were both formulated with oxaliplatin (5 mg/mL) and Lipiodol (water/oil ratio: 1/3). For Pickering-emulsion only, PLGA nanoparticles (15 mg/mL) were dissolved into oxaliplatin before formulation...
February 21, 2018: Cardiovascular and Interventional Radiology
Xiaocun Lu, Joshua S Katz, Adam Schmitt, Jeffrey S Moore
Compartmentalized structures widely exist in cellular systems (organelles) and perform essential functions in smart composite materials (microcapsules, vasculatures, and micelles) to provide localized functionality and enhance materials compatibility. An entirely water-free compartmentalization system is of significant value to the materials community as nonaqueous conditions are critical to packaging microcapsules with water-free hydrophilic payloads while avoiding energy-intensive drying steps. Few nonaqueous encapsulation techniques are known, especially when considering just the scalable processes that operate in batch mode...
February 19, 2018: Journal of the American Chemical Society
Yongli Zhang, Xingrui Wang, Chen Xu, Weiwei Yan, Qiang Tian, Zhiming Sun, Hongduo Yao, Jianping Gao
Hydrophobic and dispersible functionalized reduced graphene oxide (FrGO) was employed to prepare chitosan gel droplets by crosslinking an inverse Pickering emulsion. The emulsion was prepared using toluene as the continuous phase and a chitosan aqueous solution as the dispersed phase. The effects of the FrGO concentration and the water/oil ratio on the chitosan droplet morphology were studied. At appropriate concentrations, the FrGO acted as a stabilizer and chitosan gel droplets were formed. Decreasing the FrGO concentration or increasing the water/oil ratio was unfavorable to the formation of chitosan droplets...
April 15, 2018: Carbohydrate Polymers
Xuanxuan Lu, Jie Xiao, Qingrong Huang
A simple, organic solvent-free media-milling process was applied to modify the structure and morphology of maize starch granules. During the milling process, the sizes of starch granules reduced dramatically while their crystalline structure was largely damaged as verified by differential scanning calorimetry and X-ray diffraction. The surface hydrophobicity of milled starch was also characterized by contact angle measurement. These media-milled starch suspensions with different starch concentrations (i.e., 2...
March 2018: Food Research International
Ruiyi Li, Ling Liu, Haiyan Zhu, Zaijun Li
The paper reports synthesis of gold-palladium nanowaxberries(AuPd NWs)/dodecylamine-functionalized graphene quantum dots(D-GQDs)-graphene micro-aerogel(GMA). D-GQDs was used as a solid particle surfactant for stabilizing Pickering emulsion of toluene-in-graphene oxide aqueous dispersion. Graphene oxide sheets in the aqueous phase are reduced by hydrazine hydrate, diffused into the toluene droplet and self-assembled into graphene oxide micro-gels. Followed by freeze-drying, thermal annealing and hybridized with AuPd NWs...
May 30, 2018: Analytica Chimica Acta
Yan Zhou, Shanshan Sun, Weiya Bei, Mohamed Reda Zahi, Qipeng Yuan, Hao Liang
An effective antimicrobial system was developed by using oregano essential oil (OEO) Pickering emulsion. The Pickering emulsion was stabilized by cellulose nanocrystals (CNCs), which were from microcrystalline cellulose (MCC) by selective oxidization ammonium persulfate. Factors affecting the stability of OEO Pickering emulsions, such as oil/water ratio, CNCs concentration, ionic concentration and pH, were studied and analysed by the measurement of the droplet sizes and Zeta potential. The results showed that the emulsions had good stability at higher CNCs concentration and pH values, or at lower oil/water ratio and salt concentration...
January 28, 2018: International Journal of Biological Macromolecules
A R Richter, J P A Feitosa, H C B Paula, F M Goycoolea, R C M de Paula
In this work, we provide proof-of-concept of formation, physical characteristics and potential use as a drug delivery formulation of Pickering emulsions (PE) obtained by a novel method that combines nanoprecipitation with subsequent spontaneous emulsification process. To this end, pre-formed ultra-small (d.∼10 nm) nanoprecipitated nanoparticles of hydrophobic derivatives of cashew tree gum grafted with polylactide (CGPLAP), were conceived to stabilize Pickering emulsions obtained by spontaneous emulsification...
January 29, 2018: Colloids and Surfaces. B, Biointerfaces
J Marto, P Pinto, M Fitas, L M Gonçalves, A J Almeida, H M Ribeiro
The safety profile of the ingredients used in topical dosage forms and its evaluation is an issue of utmost importance. A suitable equilibrium between safety and efficacy is crucial before promoting a dermatological product. The aim of this work was to assess the safety and biological effects of starch-based vehicles (St-BV) used in such products. The hazard, exposure and dose-response assessment were used to characterize the risk of each ingredient. The EpiSkin™ assay and human repeat insult patch tests were performed to compare the theoretical safety assessment to in vitro and in vivo data...
January 31, 2018: Toxicology and Applied Pharmacology
Ping Zhou, Jing Li, Wenwen Yang, Lihua Zhu, Heqing Tang
The wetting property of nanomaterials is of great importance to both fundamental understanding and potential applications. However, the study on the intrinsic wetting property of nanomaterials is interfered by organic capping agents, which are often used to lower the surface energy of nanomaterials and avoid their irreversible agglomeration. In this work, the wetting property of nanostructured polyaniline that requires no organic capping agents is investigated. Compared to hydrophilic granular particulates, polyaniline nanofibers are amphiphilic and have an excellent capability of creating Pickering emulsions at a wide range of pH...
February 6, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Maria Inam, Joseph R Jones, Maria M Pérez-Madrigal, Maria C Arno, Andrew P Dove, Rachel K O'Reilly
A wide range of biorelevant applications, particularly in pharmaceutical formulations and the food and cosmetic industries, require the stabilization of two water-soluble blended components which would otherwise form incompatible biphasic mixtures. Such water-in-water emulsions can be achieved using Pickering stabilization, where two-dimensional (2D) nanomaterials are particularly effective due to their high surface area. However, control over the shape and size of the 2D nanomaterials is challenging, where it has not yet been possible to examine chemically identical nanostructures with the same thickness but different surface areas to probe the size-effect on emulsion stabilization ability...
January 24, 2018: ACS Central Science
Xichuan Zhai, Dehui Lin, Dongjie Liu, Xingbin Yang
In the present work, we investigated the formation and stability of Pickering emulsions stabilized by nanoparticles generated from bacterial cellulose (BC) by hydrochloric acid hydrolysis. The resulting particles, called nanofibers, presented a ribbonlike shape with diameters of 30-80nm and range in length from 100nm to several micrometers. The obtained nanofibers showed good hydrophilic and lipophilic properties and had significant ability to reduce the surface tension of oil/water droplets from 48.55±0.03 to 34...
January 2018: Food Research International
Yongkui Chen, Zhiyong Li, Huiyong Wang, Yuanchao Pei, Yunlei Shi, Jianji Wang
A new class of donor-acceptor Stenhouse adducts (DASAs) functionalized silica microspheres (SM) is designed and described to formulate Pickering emulsions with inversion property and large polarity change under visible light irradiation. By tuning the hydrophilicity of the functional SM particles with visible light, these Pickering emulsions can easily perform inversion from w/o to o/w. The inversion performance of the emulsions is ascribed to DASAs photoisomerization from an extended, hydrophobic, and intensely purple colored triene to a compact, zwitterionic, and colorless cyclopentenone upon irradiation with visible light...
January 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Sangsuk Han, Junsok Choi, Youngwook P Seo, In Jun Park, Hyoung Jin Choi, Yongsok Seo
The magnetorheological (MR) performance of suspensions based on the core-shell-structured PSF (foamed polystyrene)/Fe3O4 particles was investigated by using a vibrating sample magnetometer (VSM) and a rotational rheometer. The core-shell-structured PS (polystyrene) / Fe3O4 was synthesized by using Pickering-emulsion polymerization method in which Fe3O4 nanoparticles were added as a solid surfactant. Foaming the PS core in PS/Fe3O4 particles was done by using a supercritical carbon dioxide (scCO2) fluid. The density was measured by a pycnometer...
January 27, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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