Encapsulation of octadecane in poly(divinylbenzene-<i>co</i>-methyl methacrylate) using phase inversion emulsification for droplet generation

Namwong, S.; Islam, Md. Zahidul; Noppalit, Sayrung; Tangboriboonrat, Pramuan; Chaiyasat, Preeyaporn; Chaiyasat, Amorn

doi:10.1080/10601325.2016.1110452

Cited by 21 publications

(6 citation statements)

References 41 publications

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“…High encapsulation efficiency (%EE) is achieved because the polymerization locus is in the monomer droplet where all components such as monomer, initiator and target core materials of the microcapsule are soluble. We have successfully applied ms CRP to encapsulate various kinds of core materials including paraffin wax 15,16,17,18,19,20,21,22 and fragrance 23 . To the best of our knowledge, the main factor affecting encapsulation efficiency results differing polarities of capsule shell and core.…”

Section: Magnetic Particles Have Been Appliedmentioning

confidence: 99%

“…Therefore, ms CRP is the preferred technique to prepare microcapsules which high encapsulation efficiency that have no free polymer particles using a hydrophobic monomer. Divinylbenzene (DVB) is well-known monomer for encapsulation of hydrophobic cores such as wax 16,17 . DVB was selected as our model hydrophobic monomer for MNP encapsulation.…”

Section: Magnetic Particles Have Been Appliedmentioning

confidence: 99%

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High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

et al. 2019

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High encapsulation efficiency of magnetite nanoparticles (MNPs; Fe3O4) in microcapsules using PDVB as a hydrophobic polymer shell was successfully achieved by microsuspension conventional radical polymerization (ms CRP). MNPs were initially synthesized by co-precipitation of Fe2+/Fe3+ in a binary phase. During the nucleation of MNPs in alkaline aqueous solution existing oleic acid (OA), MNPs were coated with OA (MNPs-OA) before moving to the toluene phase with the addition of salt. At OA concentration of 0.3 wt%, most of the nucleated MNPs were hydrophobic and well dispersed in the toluene phase. Using DVB as a monomer for ms CRP, high encapsulation efficiency (92 %EE) of MNPs-OA was obtained, with low free polymer particle formation. By contrast, large amounts of free polymer particles were observed at low %EE (32%) of MNPs. The main driving force for high %EE was obtained by coating the surface of the MNPs by OA which increased hydrophobicity.

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Section: Magnetic Particles Have Been Appliedmentioning

confidence: 99%

Section: Magnetic Particles Have Been Appliedmentioning

confidence: 99%

High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

et al. 2019

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“…Zhang et al 65 recently presented a literature review on PCM slurries focusing on the thermal properties, the fluid flow and the heat transfer characteristics for design and optimization of systems. In another study conducted by Namwong et al 121 on micro‐encapsulated PCM with the base of octadecane and coatings of methyl methacrylate and divinylbenzene polymers, the latent heat per unit weight of hydrophilic methyl methacrylate increased by 70%. Yu et al 122 have conducted experiments on the micro‐encapsulated PCM using n‐octadecane with CaCO 3 used as the shell material.…”

Section: Heat Transfer Intensification Methods For Latent Heat Storagmentioning

confidence: 94%

A comprehensive review of heat transfer intensification methods for latent heat storage units

et al. 2020

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Latent heat thermal energy storage (LHTES) systems and their applications have been very substantive for the developments in energy science and engineering. The efficiency of LHTES systems largely depends on the thermal conductivity of the phase change materials (PCMs) and the heat transfer mechanisms in them. This review focuses on the methods employed to enhance heat transfer in LHTES systems which accordingly improve their storage performance. This includes the possible geometrical configurations of LHTES systems and the effects of their design parameters. The various methods adopted for enhancing LHTES systems' performance through either applying nanomaterials additives, using cascaded or encapsulated PCMs, or employing extended surfaces, such as fins, are discussed in detail. Additionally, various designs of PCM based heat exchangers with active and passive heat transfer techniques were highlighted. These systems are critically analyzed to help selecting reliable techniques and compatible materials for effective designs in order to achieve more efficient LHTES systems. This review would be helpful for the researchers to further develop heat transfer intensification mechanisms in LHTES systems.

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“…In a decade, we have successfully developed the encapsulation technique with high encapsulation efficiency by microsuspension polymerization using an internal phase separation mechanism. Various core substances such as heat storage materials, 23 vitamin E, 24 and jasmine oil 25 were encapsulated in various polymer shells such as poly(divinylbenzene) (PDVB), 26 poly(l‐lactic acid), 24,27 and poly(divinylbenzene‐co‐methyl methacrylate) (P(DVB‐co‐MMA)) 28,29 . Normally, using quite a hydrophilic polymer such as PMMA, a large number of free polymer particles were formed in an aqueous medium as a byproduct due to radical exit from monomer droplets.…”

Section: Introductionmentioning

confidence: 99%

Novel reusablepH‐responsive photocatalyst polymeric microcapsules for dye treatment

et al. 2020

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The photocatalyst poly(methyl methacrylate-methyl acrylate-divinylbenzene) (P(MMA-MA-DVB)) microcapsules encapsulating both bismuth vanadate (BiVO 4) and magnetite (Fe 3 O 4)nanoparticles were prepared by microsuspension iodine transfer polymerization (ms ITP) for dye treatment in wastewater. The visible light-responsive BiVO 4 and Fe 3 O 4 nanoparticles were prepared first. The silane-modified BiVO 4 (m-BiVO 4) nanoparticles increased the number of nanoparticles in an oil droplet during ms ITP, corresponding with the increase of %Loading (%L E) and %Encapsulation efficiency (%EE). The optimum ratios of monomers:m-BiVO 4 :Fe 3 O 4 at 65:30:5 and MMA:MA: DVB at 55:25:20 showed the highest %L E and %EE of encapsulated m-BiVO 4 nanoparticles with good colloidal stability. Before dye treatment, the obtained microcapsules were subsequently hydrolyzed to be P(MMA-acrylic acid [AA]-DVB) as confirmed by the presence of negative zeta potential to increase their hydrophilicity and pH-responsive property. In alkaline conditions, the hydrolyzed P)MMA-AA-DVB) microcapsules containing Span 80 showed the highest MB treatment efficiency, equal to that of pristine BiVO 4 nanoparticles. The addition of Span 80 in an oil phase enhanced the removal of MB, probably due to the increase of porosity at the microcapsule surface. Because of the incorporation of Fe 3 O 4 nanoparticles in microcapsules, they were reused for at least five treatment times by applying the external magnetic field when the treatment efficiency was still higher than 70. Therefore, the obtained reusable pHresponsive polymer microcapsule-encapsulated photocatalyst nanoparticles presented high-performance dye treatment efficacy in the synthetic wastewater.

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Encapsulation of octadecane in poly(divinylbenzene-co-methyl methacrylate) using phase inversion emulsification for droplet generation

Cited by 21 publications

References 41 publications

High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

A comprehensive review of heat transfer intensification methods for latent heat storage units

Novel reusablepH‐responsive photocatalyst polymeric microcapsules for dye treatment

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