China 
Africa 
Explore chapters and articles related to this topic
Synthesis of Metal-Organic Framework Hybrid Composites Based on Graphene Oxide and Carbon Nanotubes
Published in Anish Khan, Mohammad Jawaid, Abdullah Mohammed Ahmed Asiri, Wei Ni, Mohammed Muzibur Rahman, Metal-Organic Framework Nanocomposites, 2020
Nasani Rajendar, Bhagwati Sharma, Tridib K. Sarma, Anish Khan
Pickering emulsion is a kind of system where solid particles occupy the interphase of a two phase and stabilizes it. If solid particles are added to the emulsifying mixture like water-oil emulsion, the solid particles accumulate at the water-oil interphase and stabilize the emulsion by decreasing the energy of the system. In recent years MOFs and GO have also been found as emerging emulsifiers owing to their amphiphilic nature [83,84] (MOF: hydrophilic metal/metal cluster and hydrophobic aromatic ligands, GO: hydrophobic carbon ring system and hydrophilic oxygen surface functional groups). Because of these unique characteristics they are suitable candidates for stabilizing Pickering emulsions. Using the Pickering emulsion method, Bian et al. [85] synthesized Cu3(BTC)2-GO composite. In their studies, trimesic acid in octanol formed the oil phase, while the Cu3(BTC)2 and GO in water formed the aqueous phase. Both the solutions were mixed and emulsified using a B25 emulsifier at a speed of 10,000 rpm for 300 s followed by heating at 60°C for 1 h, which resulted in the formation of the MOF-GO composite at the interface, which was separated and vacuum dried at 60°C for 24 h. CO2 uptake studies were performed and the composite formed by the Pickering emulsion method showed better activity than the one obtained by simple mixing the MOF and GO. (Figure 7.7). Schematic representation for the formation of Cu3(BTC)2-GO nanocomposite using Pickering emulsion induced growth. Reproduced with permission from ref. 85. Copyright 2015 American Chemical Society.
Nanocomposite Fibers via Green Electrospinning
Published in Mangala Joshi, Nanotechnology in Textiles, 2020
Archana Samanta, Rajiv K. Srivastava
Though emulsion electrospinning provides a way to a solvent-free process of making nanofibers and fibrous matrices, it often requires a template or a carrier polymer to enhance the spinnability of the system [54]. Lowering of mechanical properties of electrospun fibrous fibers on exposure to an aqueous environment due to leaching or removal of the amphiphilic surfactant and/or template polymer is the major drawback of this process. Pickering emulsions, which do not require an emulsifier to stabilize the emulsion, have therefore been considered as a viable choice to prepare emulsion electrospun fibers. Instead of emulsifiers, solid particles (mostly salts, clays, metals, and metal oxides) are used to stabilize the oil/water interface in a Pickering emulsion. As compared to conventional emulsifiers, such particles are required in very low concentrations because of their irreversible adsorption at the oil/water interface [55]. Unlike emulsifiers, most of the solid particles are insoluble in aqueous media. Use of Pickering emulsions thus provides a way to generate composite fibers in a single step where the presence of inorganic particles is used to introduce functionalities in the electrospun fibers. Pickering emulsion electrospinning has the added advantages of not only being emulsifier-free but also avoiding the use of a template polymer, thus preventing deterioration of mechanical properties in an aqueous environment. Most of the work carried out so far on electrospinning of Pickering emulsions is based on o/w emulsions of PCL. Use of clay [56], silica [57], titania, nanosilver [58], and hydroxyapatite [59] as effective Pickering stabilizers is assessed, and their dispersion in fibers and their role in applications, including tissue engineering and selective sorption, is studied [55]. Composite emulsion electrospun fibers thus produced showed enhanced thermomechanical properties and especially in the case of PCL as the matrix also resulted in fibers that are conducive to the growth of various cell lines. Electrospinning of high-internal-phase emulsions of PCL is also carried out to generate co-continuous composite fibers with PVA [38].
The influences of Na+, Ca2+ on the water-in-oil Pickering emulsion stabilized by stearic acid modified hydrophobic calcium carbonate particles
Published in Journal of Dispersion Science and Technology, 2023
Kun Li, Xiaoxiao Li, Anqi Ming, Yiming Guo, Jun Sun, Hua Wang, Jianjun Ding, Xingyou Tian, Yuxiang Cao, Yuwei Lin
Pickering emulsions are emulsions stabilized by nano- or micron-sized solid particles based on partial wetting of the both phases with respect to the particles and irreversible adsorption of the particles at the interface.[1] Compared with traditional emulsions, Pickering emulsion usually has more prominent stability against coalescence and does not require the use of surfactant. Based on these advantages, Pickering emulsions have gradually become a research hotspot in recent decades and are widely used in polymerization,[2,3] porous material preparation,[4,5] pharmaceutical,[6] food[7,8] and biphasic catalysis.[9–11]
Preparation and stabilisation mechanism of asphalt-in-water Pickering emulsion stabilised by SiO2 nanoparticles
Published in Road Materials and Pavement Design, 2021
The emulsified asphalt is widely used in pavement engineering due to its advantages in construction convenience, energy-saving, and environmental friendliness. However, compared with the hot mix asphalt, a gap still exists in the road-related performance of the emulsified asphalt due to its limitation from the emulsifier and emulsification technology. At the beginning of the last century, Pickering et al., systematically studied the interaction mechanism of the two stable and incompatible phases in the presence of particle emulsifier (e.g. 1907). After that, the emulsion stabilised with solid particles is often referred to as Pickering emulsion. Instead of a common emulsion system, the Pickering emulsion has been extensively employed in food, coating, chemical engineering, medicine, and other industries because of its merits in stability, environmental safety, and low cost. Nevertheless, few (if any) research work has been devoted to the pavement engineering.
Fabrication and characterization of tea seed oil pickering emulsion stabilized synergistically by carboxymethylcellulose and β-cyclodextrin
Published in Journal of Dispersion Science and Technology, 2023
Xianghua Chai, Wenli Wang, Kegang Wu, Tong Zhang, Xuejuan Duan, Dong He, Yuqiang Huang, Zhihao Zhang
Tea seed oil is fragrant and rich in nutrients, and its main components are oleic acid and linoleic acid.[1] It can prevent hypertension and cardiovascular diseases, therefor is benefit to human health.[2] However, tea seed oil can be oxidized easily, and the low absorption rate of fat-soluble substances limits its application. Emulsifying it into emulsion can improve its utilization value. Pickering emulsion was stabilized by solid particle has many advantages, such as strong anti-coalescence, low toxicity, low cost, and biocompatibility,[3–5] which has attracted many people’s attention.