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Preparation and Performance of Dual‐functional Magnetic Phase‐change Microcapsules
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-11-30 , DOI: 10.1002/asia.202001280 Furong Li 1 , Zhicheng Sun 1 , Shouzheng Jiao 1 , Yutong Ma 1 , Qingqing Zhang 1 , Yang Zhou 2 , Jinyue Wen 1 , YuanYuan Liu 2
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-11-30 , DOI: 10.1002/asia.202001280 Furong Li 1 , Zhicheng Sun 1 , Shouzheng Jiao 1 , Yutong Ma 1 , Qingqing Zhang 1 , Yang Zhou 2 , Jinyue Wen 1 , YuanYuan Liu 2
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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.
中文翻译：
双功能磁性相变微胶囊的制备及性能
迄今为止，制造所需的用于辐射屏蔽的抗电磁材料仍然是一个挑战。在这项工作中，通过原位聚合成功地制备了一种新型的双功能磁屏蔽相变微胶囊，该微胶囊以石蜡为核芯，三聚氰胺-甲醛（MF）树脂为壳，并在壳中掺杂了磁性颗粒。通过在表面上涂覆亲水性乳化剂，将磁性颗粒分散在壳层中。这些微胶囊通过丝网印刷法特别地应用于磁屏蔽领域。通过差示扫描量热法和热重分析法研究了磁性粒子对相变微胶囊性能的影响。通过振动样品磁力计研究了微胶囊的磁性类型和磁性强度。而且，不同磁性颗粒（Fe比较了3 O 4，CrO 2）对相变微胶囊性能和微胶囊磁强度的影响。结果表明，这两种磁性颗粒可以大大提高微胶囊的相变潜热，热稳定性和导热性。最后，通过在墙纸上丝网印刷磁屏蔽油墨，证明了这些微胶囊在静磁场和脉冲磁场中的巨大磁屏蔽作用。掺入0.5 g Fe 3 O 4特别是在微胶囊内部，磁场强度在短距离内有效地减小了约250 Oe。我们期望这些磁性微囊具有通过丝网印刷在各种基材上屏蔽辐射的巨大潜力。
更新日期：2021-01-04
中文翻译：
双功能磁性相变微胶囊的制备及性能
迄今为止，制造所需的用于辐射屏蔽的抗电磁材料仍然是一个挑战。在这项工作中，通过原位聚合成功地制备了一种新型的双功能磁屏蔽相变微胶囊，该微胶囊以石蜡为核芯，三聚氰胺-甲醛（MF）树脂为壳，并在壳中掺杂了磁性颗粒。通过在表面上涂覆亲水性乳化剂，将磁性颗粒分散在壳层中。这些微胶囊通过丝网印刷法特别地应用于磁屏蔽领域。通过差示扫描量热法和热重分析法研究了磁性粒子对相变微胶囊性能的影响。通过振动样品磁力计研究了微胶囊的磁性类型和磁性强度。而且，不同磁性颗粒（Fe比较了3 O 4，CrO 2）对相变微胶囊性能和微胶囊磁强度的影响。结果表明，这两种磁性颗粒可以大大提高微胶囊的相变潜热，热稳定性和导热性。最后，通过在墙纸上丝网印刷磁屏蔽油墨，证明了这些微胶囊在静磁场和脉冲磁场中的巨大磁屏蔽作用。掺入0.5 g Fe 3 O 4特别是在微胶囊内部，磁场强度在短距离内有效地减小了约250 Oe。我们期望这些磁性微囊具有通过丝网印刷在各种基材上屏蔽辐射的巨大潜力。
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