Preparation and characterization of magnetic phase-change microcapsules

Huang, Yong; Xuan, Yimin; Li, Qiang; Che, Jianfei

doi:10.1007/s11434-008-0583-z

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…20,24,28 First, a certain amount of this prepolymer was adjusted to a pH of 4.0 with 10 wt % aqueous maleic anhydride. After it was stirred for 1 h, the adjusted prepolymer was diluted by 40 mL of deionized water containing 3 g of NaCl, 0.1 g of gelatin, and 0.04 g of resorcinol.…”

Section: Preparation Of Uf Prepolymermentioning

confidence: 99%

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Synthesis of enhanced urea–formaldehyde resin microcapsules doped with nanotitania

Niu

Yangshan

Ding

et al. 2011

J of Applied Polymer Sci

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Urea-formaldehyde (UF) resin microcapsules doped with TiO 2 nanoparticles were prepared by in situ polymerization, and the properties of the microcapsules, such as the surface morphologies, thermal properties, and chemical elemental composition, were measured by optical microscopy, scanning electron microscopy, thermogravimetric analysis, and energy-dispersive X-ray spectrometer analysis. The effects of the presence of ammonium chloride and its concentration and the concentrations of UF resin prepolymer and TiO 2 nanoparticles during the reaction and deposition of UF on the microcapsule surface on the properties of the microcapsules were investigated. Enhanced UF resin microcapsules with more stability and mechanical strength could be obtained under the optimal conditions.

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Section: Preparation Of Uf Prepolymermentioning

confidence: 99%

“…[21][22][23] Xuan et al 24 introduced iron nanoparticles into the shells of UF resins to endow the microcapsules with excellent magnetic properties. Li et al 25 prepared phase-change material microcapsules incorporated with silver nanoparticles to increase the wall toughness and mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of enhanced urea–formaldehyde resin microcapsules doped with nanotitania

Niu

Yangshan

Ding

et al. 2011

J of Applied Polymer Sci

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“…The concept was demonstrated for instance by Chu and co-workers by incorporating PNIPAM-co-PAAm sub-microspheres in the shell wall of chitosan microcapsules. 230 Other examples include decoration of the capsule-wall with micelles, 231 magnetic nanoparticles, 206 or using an electrophoretic fluid as core for displays. 158 Materials with self-healing properties, 53 tunable pore-size, 230 and controlled-release properties 232 are all examples of current research interests with promising applications in smart technologies.…”

Section: Trends In Urea-formaldehyde Microencapsulationmentioning

confidence: 99%

“…205 properties that could be collected using a magnet (Figure 18a, b). 206 The in situ polymerization of urea and formaldehyde was also favorable for the exfoliation of nanoclays, that once incorporated, increased the barrier properties of the capsules by increasing the diffusion path (p and p') of a core material (Figure 18c). 169…”

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confidence: 99%

Microencapsulation byin situPolymerization of Amino Resins

et al. 2017

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By surrounding small droplets with a coating, one can obtain micrometer-size capsules (microcapsules), and combine multiple properties into a single system. This technology has allowed the design of advanced and functional materials. Amino resins are composed principally of urea and/or melamine and formaldehyde, and exhibit advantages as wall-forming materials, such as high mechanical strength and chemical resistance. In this review, a general description of the encapsulation process by in situ polymerization of amino resins is given. Characterization methods, and the influence of the physical and design parameters are discussed. A mechanistic description, and some of the promising avenues of research are also presented.

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“…Those energies are so‐called as the latent heat of phase change. The phase‐change microcapsules [1–7] (MPCMs) were reported to have a tiny core‐shell structure formed by a film‐forming material wrapping a phase change material. The most commonly used methods for preparing phase‐change microcapsules include interfacial polymerization, [8–10] in situ polymerization, [11–12] and coacervation [13–15] .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Dual‐functional Magnetic Phase‐change Microcapsules

Sun

Jiao

et al. 2020

Chemistry An Asian Journal

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The fabrication of desired anti‐magnetic materials for irradiation shielding remains a challenge to date. In this work, a new type of dual‐functional magnetic shielding phase change microcapsules with paraffin as the core, melamine‐formaldehyde (MF) resin as the shell and doped with magnetic particles in the shell were successfully prepared by in situ polymerization. The magnetic particles were dispersed in the shell layer by coating a hydrophilic emulsifier on the surface. These microcapsules were specifically applied to the field of magnetic shielding by the screen printing method. The effect of magnetic particles on the performance of phase‐change microcapsules was examined by differential scanning calorimetry and thermogravimetric analyses. The magnetic type and magnetic strength of the microcapsules were studied by the vibrating sample magnetometer. Moreover, the effects of different magnetic particles (Fe3O4, CrO2) on the performance of phase change microcapsules and the magnetic strength of microcapsules were compared. The results showed that these two kinds of magnetic particles can greatly improve the phase change latent heat, thermal stability, and thermal conductivity of the microcapsules. Finally, the great magnetic shielding role of these microcapsules was demonstrated in both static and pulsed magnetic fields through the screen printing of magnetic shielding ink on wallpaper. Incorporating 0.5 g Fe3O4 inside of microcapsules, specifically, the magnetic intensity was effectively reduced by ∼250 Oe within a short distance in the static field. We expect that these magnetic microcapsules hold great potential for the shielding of irradiations via the screen printing on various substrates.

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Preparation and characterization of magnetic phase-change microcapsules

Cited by 12 publications

References 11 publications

Synthesis of enhanced urea–formaldehyde resin microcapsules doped with nanotitania

Synthesis of enhanced urea–formaldehyde resin microcapsules doped with nanotitania

Microencapsulation byin situPolymerization of Amino Resins

Preparation and Performance of Dual‐functional Magnetic Phase‐change Microcapsules

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