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Pickering emulsion

Xia Li, Jun Li, Jie Gong, Yishan Kuang, Lihuan Mo, Tao Song
In recent years, nanocelluloses have attracted a lot of interests as promising stabilizers for Pickering emulsion particularly in food, cosmetics and pharmaceutics industries. In this work, two cellulose nanocrystals (named CNCs-I and CNCs-II) with different crystalline allomorph were investigated as stabilizers for oil-water Pickering emulsion. CNCs were prepared by sulfuric acid hydrolysis of unmodified and mercerized microcrystalline cellulose (MCC), respectively. CNCs-I was needle-like particles (length - 200 nm, width - 16...
March 1, 2018: Carbohydrate Polymers
Renji Bian, Ruizhi Lin, Guilin Wang, Gang Lu, Weiqiang Zhi, Shanglin Xiang, Tingwei Wang, Paul S Clegg, Dongyu Cai, Wei Huang
MXene is an emerging class of 2D materials exfoliated from ternary carbide and nitride ceramics. The exfoliation process, which is an acid etching approach, functionalizes the MXene surface with -OH, -O and -F groups. These functional groups offer significant opportunities for tuning the colloidal properties of the MXene nanoblocks; importantly, this tunability points the way towards a facile route for assembling these nanoblocks into 3D architectures that are in demand for many applications. This route, presented for the first time here, uses water/oil interfaces for assembling Ti3C2-MXene in 3D architectures...
January 19, 2018: Nanoscale
Fu-Zhen Zhou, Li Yan, Shou-Wei Yin, Chuan-He Tang, Xiao-Quan Yang
This work attempted to engineer emulsions' interface using special affinity between proline-rich gliadin and proanthocyanidins (PA), to develop surfactant-free antioxidant Pickering emulsions with digestive-resistant properties. This binding interaction between gliadin and PA benefited the interfacial adsorption of the particles to corn oil droplets. Pickering droplets as building units assembled into interconnected three-dimensional network structure, giving the emulsions viscoelasticity and ultra-stability...
January 19, 2018: Journal of Agricultural and Food Chemistry
Zuoxu Xiao, Hongyan Cao, Xubao Jiang, Xiang Zheng Kong
Stable dispersions of paraffin wax droplets and their nano- and microspheres have broad applications. Despite intensive efforts, the production of uniform wax spheres remains a challenge. For their preparation, abundant surfactants and other additives are commonly used to stabilize the dispersions. These additives are hardly removable and entrain often adverse consequence in many applications, particularly in biological and medical applications, where microspheres with absolutely clean surface are preferred...
January 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Somayeh Zamani, Nicholas Malchione, Michael J Selig, Alireza Abbaspourrad
High internal phase emulsions (HIPE) prepared using whey protein microgels (WPMs) as a surfactant were demonstrated to have substantially higher stability than HIPEs prepared using similar loadings of non-gelled whey protein isolate (WPI) or Tween 20. Microgel colloids were prepared from WPI solutions by heat treatment at 85 °C in a narrow pH range (5.8-6.0) to particle sizes of approximately 90, 160 and 350 nm in diameter. ζ-potentials of the WPM increased in negativity with decreasing particle size from -7...
January 15, 2018: Food & Function
F Z Zhou, T Zeng, S W Yin, C H Tang, D B Yuan, X Q Yang
In this paper, we demonstrate for the first time the use of gliadin particles to structure algal oil (rich in DHA) and to exert chemical stability against lipid oxidation via the Pickering high internal phase emulsion (HIPE) strategy. The gliadin/chitosan colloid particles (GCCPs) were effectively adsorbed and anchored at the algal oil-water interface. Concomitantly, the particle-coated droplets as building blocks constructed a percolating 3D-network framework, endowing Pickering HIPEs with viscoelastic and self-supporting attributes...
January 11, 2018: Food & Function
Matthew J Large, Sean P Ogilvie, Manuela Meloni, Aline Amorim Graf, Giuseppe Fratta, Jonathan Salvage, Alice A K King, Alan B Dalton
Pickering emulsions stabilised with nanomaterials provide routes to a range of functional macroscopic assemblies. We demonstrate the formation and properties of water-in-oil emulsions prepared through liquid-phase exfoliation of graphene. Due to the functional nature of the stabiliser, the emulsions exhibit conductivity due to inter-particle tunnelling. We demonstrate a strain sensing application with a large gauge factor of ∼40; the highest reported in a liquid. Our methodology can be applied to other two-dimensional layered materials opening up applications such as energy storage materials, and flexible and printable electronics...
January 9, 2018: Nanoscale
Clara Jiménez Saelices, Isabelle Capron
The development of biobased materials with lower environmental impact has seen an increased interest these last years. In this area, nanocelluloses have shown a particular interest in research and industries. Cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF) are both known to stabilize oil-water interface forming the so-called Pickering emulsions which are surfactant-free, highly stable emulsions armored by a layer of solid particles. This work describes the emulsion's characteristics and properties according to particle sizes, shape and surface chemistry in order to produce controlled micro- and nano-emulsions stabilized by nanocelluloses...
January 8, 2018: Biomacromolecules
Yufei Xia, Jie Wu, Wei Wei, Yiqun Du, Tao Wan, Xiaowei Ma, Wenqi An, Aiying Guo, Chunyu Miao, Hua Yue, Shuoguo Li, Xuetao Cao, Zhiguo Su, Guanghui Ma
A major challenge in vaccine formulations is the stimulation of both the humoral and cellular immune response for well-defined antigens with high efficacy and safety. Adjuvant research has focused on developing particulate carriers to model the sizes, shapes and compositions of microbes or diseased cells, but not antigen fluidity and pliability. Here, we develop Pickering emulsions-that is, particle-stabilized emulsions that retain the force-dependent deformability and lateral mobility of presented antigens while displaying high biosafety and antigen-loading capabilities...
January 4, 2018: Nature Materials
Solmaz Hajizadeh, Karin Kettisen, Magnus Gram, Leif Bülow, Lei Ye
Purification of haemoglobin (Hb) has been studied for many years due to its ability to act as an oxygen carrier and its possible use in urgent clinical treatment. In this study, different types of chromatography columns were developed for Hb purification. Two of them showed satisfactory results as affinity chromatography columns and were thus studied more extensively. The affinity adsorbents were prepared by molecular imprinting techniques. In the first case, Pickering emulsion polymerization was used to prepare affinity adsorbents based on molecular imprinting technology...
December 18, 2017: Journal of Chromatography. A
Sakthivel Nagarajan, Dominique Abessolo Ondo, Sana Gassara, Mikhael Bechelany, Sebastien Balme, Philippe Miele, Narayana S Kalkura, Celine Pochat-Bohatier
This paper presents a novel procedure to prepare porous membranes from water-soluble polymers involving the formation of Pickering emulsion. Gelatin is a biodegradable biopolymer obtained by the partial hydrolysis of collagen. Biopolymer such as gelatin is capable to adsorb at oil/water interface and results to decrease interfacial energy. Hence, gelatin is widely employed as an alternate for synthetic surfactants to stabilize emulsions in food industry. However, high molecular weight gelatin leads to large emulsion droplets and poor emulsion stability...
December 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Chuanwei Miao, Mani Tayebi, Wadood Y Hamad
Medium and high internal phase Pickering emulsions stabilized by cellulose nanocrystals (CNCs) have been prepared and the effects of CNC concentration and type of oil phase on the properties of emulsions were studied. The maximum oil phase volume that can be stabilized by CNCs is 87% when the CNC concentration is 0.6 wt.%; this slightly decreases to 83% when the CNC concentration is increased to 1.2 wt.% or higher. In addition, the oil droplets stabilized with 0.6 wt.% CNC suspensions have a larger size than those stabilized with higher concentration CNC suspensions...
February 13, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Yongkang Xi, Zhigang Luo, Xuanxuan Lu, Xichun Peng
Cyclodextrins was proved to form complexes with linear oil molecules and stabilize emulsions. Amphiphilic properties of cyclodextrins particles were modulated through esterification reaction between β-cyclodextrins (β-CD) and octadecenyl succinic anhydride (ODSA) under alkaline conditions. ODS-β-CD particles with DS of 0.003, 0.011 and 0.019 were obtained. . The introduced hydrophobic long chain that was linked within β-CD cavity led to the change of ODS-β-CD in terms of morphological structure, surface charge density, size and contact angle, upon which the properties and stability of the emulsions stabilized by ODS-β-CD were highly dependent...
December 18, 2017: Journal of Agricultural and Food Chemistry
Guojun Lv, Fumin Wang, Xubin Zhang, Bernard P Binks
Design of catalyst particles bearing excellent catalytic activity and suitable surface wettability is the key to the successful application of Pickering interfacial catalysis. In this study, the epoxidations of 1-hexene and cyclohexene with aqueous hydrogen peroxide over hollow titanosilicate TS-1 zeolite were studied as probe reactions to investigate the influence of catalyst surface wettability on its catalytic activity. Hydrophobized hollow TS-1 particles (HTS-1) were fabricated via a post-synthesis desilication treatment with tetrapropylammonium hydroxide (TPAOH) and a post-synthesis silylation treatment with hexamethyldisiloxane (HMDSO)...
December 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Hyeri Kim, Jangwoo Cho, Jaehong Cho, Bum Jun Park, Jin Woong Kim
We present a straightforward and robust method for the synthesis of Janus colloid surfactants with distinct amphiphilicity and magnetic responsiveness. To this end, hydroxyl-functionalized amphiphilic Janus microparticles are synthesized by seeded monomer swelling and subsequent photo-polymerization. By incorporating controlled amounts of hydroxyl groups on poly (styrene-co-vinyl alcohol) seed particles, we adjust the interfacial tension between the seed polymer and the poly (tetradecyl acrylate) secondary polymer (γ13)...
December 15, 2017: ACS Applied Materials & Interfaces
Jingsan Xu, Qian Cao, Qianling Cui, Yu Yang, Chenhui Han, Lidong Li
g-C3N4 has been found highly functional in many fields, such as photocatalysis, electrocatalysis and chemical analysis. Pickering emulsion polymerization is a fascinating strategy to fabricate a range of nanomaterials, in which the emulsion is stabilized by solid particles, rather than molecular surfactants. Here, we demonstrate that g-C3N4 can act as a remarkable stabilizer for Pickering emulsion polymerization. Contrary to ordinary Pickering systems, monodisperse polystyrene microspheres with tunable size, surface charge and morphology were achieved using this approach...
December 15, 2017: Chemistry: a European Journal
Fan Wang, Shuai Wang, Tao Yi, Ji-Fen Zhang
To investigate the effects of drug and oil properties on the formation and stability of drug nanocrystalline self-stabilizied Pickering emulsions (NSSPE). Three insoluble Chinese medicine components (puerarin, tanshinone ⅡA and ferulic acid) were selected as model drugs, and Capmul C8, Fabrafil M 1944 CS, isopropyl myristate, Pzechwan Lovage Rhizome oil, and olive oil were used as oil phase. NSSPEs were developed by high pressure homogenization method and were evaluated for their appearance, centrifugal stability, droplet size and drug content changes in emulsion layer after storing at room temperature for 14 d...
October 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Jianqiang Chen, Chenyang Zhu, Zhen Yang, Yiying Yue, Ping Wang, Takuya Kitaoka
Lack of deep understanding of nanoparticles (NPs) actions in oil/water interface set an obstacle to practical applications of Pickering emulsions. Fluorescence labels by incorporation of carbon dots (CDs) into poly(N-isopropylacrylamide) (PNIPAM) matrix can not only mark the action of PNIPAM-based NPs in the interface, but also reflect the colloidal morphologies of PNIPAM. In this work, we employed coaxial electrospraying for fabricating core-shell nanospheres of cellulose acetate encapsulated by PNIPAM and facile incorporation of CDs in PNIPAM shell was achieved simultaneously...
December 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Bo Pang, Huan Liu, Peiwen Liu, Xinwen Peng, Kai Zhang
HYPOTHESIS: Hydrophobic particles with static water contact angles larger than 90° are more like to stabilize W/O Pickering emulsions. In particular, high internal phase Pickering emulsions (HIPEs) are of great interest for diverse applications. However, W/O HIPEs have rarely been realized using sustainable biopolymers. Herein, we used stearoylated microcrystalline cellulose (SMCC) to stabilize W/O Pickering emulsions and especially, W/O HIPEs. Moreover, these W/O HIPEs can be further used as platforms for the preparation of porous materials, such as porous foams...
November 29, 2017: Journal of Colloid and Interface Science
Song Wang, Jiaxu Li, Mengfei Qi, Xiang Gao, Wen-Jun Wang
Macroporous materials polymerized from high internal phase emulsions (PolyHIPEs) possess well-defined interconnected porous structures and tunable device shapes. This provides interesting property characteristics well-suited for a variety of applications. However, such materials also demonstrate poor mechanical performances, which limit their potential use. As will be demonstrated, this results from the high surfactant content required by PolyHIPEs. Herein, a new approach is introduced for designing a highly efficient polymeric surfactant, which generates interconnected pores in PolyHIPEs through designing an incompatible surfactant and skeleton material...
December 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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