Polyurethane-based nanoparticles as stabilizers for oil-in-water or water-in-oil Pickering emulsions

Ma, Chunfeng; Bi, Xiaobo; Ngai, To; Zhang, Guangzhao

doi:10.1039/c3ta00123g

Cited by 47 publications

(37 citation statements)

References 35 publications

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“…17 The foam stabilization by particles depends on the wetting characteristics of the powder. [18][19][20][21][22][23][24][25][26] It is well known that the wetting of a powder with a liquid depends on the particle size. 19,20,22 In the present work, we have investigated the effect of the AC particle size on the foaming characteristics of aqueous sucrose resin and the properties such as density, cell size, compressive strength, thermal conductivity, fire resistance, and machinability of the carbon foams.…”

Section: Introductionmentioning

confidence: 99%

Effect of activated carbon particle size on the thermo-foaming of aqueous sucrose resin and properties of the carbon foams

2014

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The carbon foams prepared by the thermo-foaming of dispersions of activated carbon (AC) powder of various average particle sizes (4.9 to 15 lm) in an aqueous sucrose resin were characterized. The stability of the wet foams increased with the decrease in the AC particle size as finer particles preferentially adsorbed on the air-resin interface. The particle agglomeration leading to the foam collapse was observed at lower AC powder to sucrose weight ratios with the finer powders. The cell size (0.33-2.34 mm), foam density (0.1151-0.2281 g/cm 3 ), and compressive strength (0.16-2.77 MPa) of the carbon foams depend on the AC particle size as well as the AC powder to sucrose weight ratio. The thermal conductivity of the carbon foams (0.036-0.049 W m À1 K À1 ) was much lower than that of the vitreous carbon foams of similar densities. The foams were fire resistant and amenable to machining with the conventional machines and tool.

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Section: Introductionmentioning

confidence: 99%

Effect of activated carbon particle size on the thermo-foaming of aqueous sucrose resin and properties of the carbon foams

2014

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“…It has been reported that the stability of Pickering emulsions based on conventional solid particles can often be influenced by pH [46,47,48]. In this case, pH adjustment of the dispersion medium is generally required to prepare stable emulsions.…”

Section: Resultsmentioning

confidence: 99%

An Oligoimide Particle as a Pickering Emulsion Stabilizer

et al. 2018

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A pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA)-based oligoimide (PMDA-ODA) was synthesized by a one-step procedure using water as a solvent. The PMDA-ODA particles showed excellent partial wetting properties and were stably dispersed in both water and oil phases. A stable dispersion was not obtained with comparison PMDA-ODA particles that were synthesized by a conventional two-step method using an organic solvent. Both oil-in-water and water-in-oil Pickering emulsions were prepared using the oligoimide particles synthesized in water, and the size of the emulsion droplet was controlled based on the oligoimide particle concentration. The oligoimide particles were tested to prepare Pickering emulsions using various kinds of oils. The oil-in-water Pickering emulsions were successfully applied to prepare microcapsules of the emulsion droplets. Our new Pickering emulsion stabilizer has the advantages of easy synthesis, no need for surface modification, and the capability of stabilizing both oil-in-water and water-in-oil emulsions.

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“…The star-like polymer nanoparticles with a core-shell structure have been proved to possess excellent interfacial performances and could be applied as emulsifier to generate ultrastabilized Pickering emulsions. [57][58][59][60] In this study, highly stabilized toluene in water Pickering emulsion (V toluene /V water =1) was formed using the obtained spherical nanoparticles as emulsifiers, and the weight percent of the emulsifiers was about 0.01% versus the total weight of the oil and water for emulsion formation. As indicated in Fig.…”

Section: Formation Of Toluene In Water Pickering Emulsionmentioning

confidence: 99%

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

Yuan

Gao

et al. 2016

RSC Adv.

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A robust method for the synthesis of the well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) (PU-g-PDMA) copolymers with a good control over the graft density and the grafted chain length was presented in this study. Firstly, functional polyurethane (fPU) polymer with trithiocarbonate-based chain transfer agent lateral group was synthesized by the polyaddition reaction of 2,2-bis(hydroxymethyl)butyl 2-(ethylthiocarbonothioylthio)-2-methylpropanoate (BEMP) with hexamethylene diisocyanate (HDI), and the subsequent chain extension reaction with 1,4-butanediol (BDO). The content of the chain-transfer groups in the synthesized fPU could be well tuned by altering the mole ratio of BEMP to HDI during the synthesis of prepolymer. The produced fPU was then applied as the macro-RAFT to mediate the radical polymerization reaction of the N,N-dimethylacrylamide (DMA) monomers that were initiated by azobisisobutyronitrile (AIBN), resulting in well-defined amphiphilic PU-g-PDMA graft copolymers with a known graft density and tunable grafted chain lengths. The structure of the obtained PU-g-PDMA was characterized carefully by FTIR and 1 H NMR. The average molecular weight and polydistribution of PU-g-PDMA copolymers were analyzed by GPC. The thermal properties of fPU and PU-g-PDMA copolymers were investigated by differential scanning calorimetry (DSC) and themogravimetric analysis (TGA). The amphiphilic PU-g-PDMA graft copolymers could self assemble into spherical nanoparticles with a core-shell structure in water. The core-shell structure nanoparticles could be applied as emulsifiers for the formation of stabilized toluene in water Pickering emulsion, and an extremely low content of emulsifiers (~0.01%) relative to the total weight of oil and water was required.

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Polyurethane-based nanoparticles as stabilizers for oil-in-water or water-in-oil Pickering emulsions

Cited by 47 publications

References 35 publications

Effect of activated carbon particle size on the thermo-foaming of aqueous sucrose resin and properties of the carbon foams

Effect of activated carbon particle size on the thermo-foaming of aqueous sucrose resin and properties of the carbon foams

An Oligoimide Particle as a Pickering Emulsion Stabilizer

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

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