Robust and Eco-Friendly Waterborne Phase-Change Composite Protective Coatings Containing Paraffin-Loaded SiO2/Fe3O4 Hybrid Wall Microcapsules and Their Application in Long-Term Effective Temperature Regulation of the Protected Substrate

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Langmuir Pub Date : 2025-03-27 DOI:10.1021/acs.langmuir.5c00236

Yingjie Ma, Baolei Liu, Dewen Sun, Dongfang Wang, Yabin Ma, Qianping Ran

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Abstract

SiO₂/Fe₃O₄ hybrid wall microcapsules containing a paraffin core were successfully fabricated by Pickering emulsion template self-assembly and sol–gel technologies. The walls of these microcapsules were embedded with different dosages of Fe₃O₄ nanoparticles due to the effect of Fe₃O₄ Pickering emulsion of different concentrations. The resultant microcapsules exhibited a regular spherical morphology and a rough outer surface compared with that of the SiO₂ wall. Thermal analysis indicated that the encapsulation efficiency (E_en), thermal energy-storage efficiency (E_es), and thermal conductivity of paraffin@SiO₂/Fe₃O₄ hybrid wall microcapsules prepared with 0.01 mol/L Fe₃O₄ Pickering emulsion [Pa@SiO₂/Fe₃O₄-Ms (0.01)] increased by 16.71%, 16.88%, and 28.4% compared with those of paraffin@SiO₂ microcapsules (Pa@SiO₂-Ms), respectively. The phase-change temperatures and enthalpy of Pa@SiO₂/Fe₃O₄-Ms (0.01) with an 80–100 μm particle size range changed little after 300 thermal cycles. At the same time, these microcapsules were introduced into water-based acrylic resin paint to prepare phase-change composite protective coatings (PCCPCs) and exhibited excellent thermoregulatory performance. The real-time temperature difference and temperature ramp rate of PCCPCs incorporating 5 wt % (80–100 μm) Pa@SiO₂/Fe₃O₄-Ms (0.01) increased by 4.6 °C and decreased by 2.45 °C/min compared to that of the pure coating, respectively. Meanwhile, the fluctuation amplitude and fluctuation frequency of the average temperature on the back side of 5 wt % (80–100 μm) Pa@SiO₂/Fe₃O₄-Ms (0.01)-PCCPCs decreased by 3.8 °C and extended by 395 s compared to that of the pure coating under one heating and cooling cycle, respectively. This study will provide great potential applications for addressing the risk of shrinkage deformation and cracking of the protected concrete substrates under high-frequency and large temperature difference conditions.

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含石蜡负载SiO2/Fe3O4杂化壁微胶囊的坚固环保水性相变复合保护涂层及其在保护基板长期有效温度调节中的应用

采用Pickering乳液模板自组装和溶胶-凝胶技术成功制备了含石蜡岩心的SiO2/Fe3O4杂化壁微胶囊。由于不同浓度的Fe3O4 Pickering乳剂的作用，这些微胶囊的壁面包埋了不同剂量的Fe3O4纳米颗粒。与SiO2壁相比，所得微胶囊具有规则的球形形貌和粗糙的外表面。热分析表明，以0.01 mol/L Fe3O4 Pickering乳剂[Pa@SiO2/Fe3O4- ms(0.01)]制备的paraffin@SiO2/Fe3O4杂化壁微胶囊的包封效率（Een）、热储能效率（Ees）和导热系数分别比paraffin@SiO2微胶囊（Pa@SiO2-Ms）提高了16.71%、16.88%和28.4%。温度循环300次后，粒径范围为80 ~ 100 μm的Pa@SiO2/Fe3O4-Ms（0.01）的相变温度和焓变化不大。同时，将这些微胶囊引入水性丙烯酸树脂涂料中制备相变复合防护涂料（PCCPCs），并表现出优异的热调节性能。添加5 wt % (80-100 μm) Pa@SiO2/Fe3O4-Ms（0.01）的PCCPCs的实时温差和温度斜坡率分别比纯涂层增大4.6°C和减小2.45°C/min。与纯涂层相比，5 wt % (80-100 μm) Pa@SiO2/Fe3O4-Ms (0.01)-PCCPCs的背面平均温度波动幅度和波动频率分别降低3.8℃和延长395 s。该研究将为解决高频大温差条件下受保护混凝土基板的收缩变形和开裂风险提供巨大的潜在应用。

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阿拉丁

TEOS

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cetyltrimethylammonium bromide

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ferric chloride hexahydrate

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ferrous chloride tetrahydrate

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formamide

来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).