Synthesis of paraffin@PS/reduced graphene oxide microcapsules via Pickering emulsion for multi-protective coatings

Xu, Changyue; Gou, Weiwei; Wang, Xuemei; Zhou, Jianlin; Liu, Jingyan; Chen, Kunlin

doi:10.1016/j.colsurfa.2020.126054

Cited by 19 publications

(10 citation statements)

References 44 publications

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“…To further investigate the shell structure, the microcapsules are cracked and then heated in a 65 °C oven for 30 min to make the PW core flow out (the melting temperature of PW is below 60 °C). It is widely known that the decomposition temperature of PS is much higher than 65 °C; hence, the PS material did not decompose after heat treatment. As shown in Figure c, the SEM image of cracked MEPCM only leaves the microcapsule shell after the above heat treatment, which indicates that PS produced by styrene polymerization, as another component of the microcapsule shell, forms a two-component shell with BNNS.…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding DSC parameters of MEPCM with different coating rates are listed in Table . The DSC results show that the solid–solid crystal-type transition and solid–liquid phase change of pure PW occurred at 37.5/45.4 and 53.3/58.7 °C during the heating/cooling process, respectively . The thermal behavior of all MEPCMs is similar to that of pure PW; i.e., there are two endothermic and exothermic peaks within the temperature range of the PW solid–solid crystal transition and solid–liquid phase change, respectively, which proves that the cross-linking agent did not react with PW but was polymerized with styrene.…”

Section: Resultsmentioning

confidence: 99%

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Phase Change Microcapsules with a Polystyrene/Boron Nitride Nanosheet Hybrid Shell for Enhanced Thermal Management of Electronics

et al. 2022

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Organic shell material and phase change material (PCM) have low thermal conductivity, which reduces the heat absorption and release rate of microencapsulated phase change materials (MEPCMs). Boron nitride nanosheets (BNNSs) with high thermal conductivity can not only stabilize the oil phase as the Pickering emulsifier but also improve the thermal conductivity of MEPCMs as one of the shell components, thus facilitating the heat conduction in the microcapsule system. Herein, MEPCM with paraffin wax (PW) as the core material and polystyrene (PS) modified by BNNSs as the shell material (PW@PS/BNNS MEPCMs) are synthesized via Pickering emulsion polymerization. The structure of PW@PS/BNNS MEPCMs can be regulated by tuning the PW and BNNS contents, to achieve high latent heat and thermal conductivity. In comparison to pure PW, the thermal conductivity of MEPCMs−5 wt % BNNSs increases by 63.76% at 25 °C. The PW@PS/BNNS powder possesses a latent heat capacity of 166.3 J/ g, corresponding to a high encapsulation ratio of 80.77%. These properties endow the prepared MEPCMs with excellent thermal regulation properties. We also propose the formation mechanism of PW@PS/BNNS MEPCMs via Pickering emulsion polymerization for the first time, which will guide the MEPCM fabrication toward a reliable direction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Phase Change Microcapsules with a Polystyrene/Boron Nitride Nanosheet Hybrid Shell for Enhanced Thermal Management of Electronics

et al. 2022

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“…Phase change materials (PCMs) have drawn plenty of interest because of their high heat storage density and ability to store energy at a constant temperature. − However, the inherent poor heat conductivity and heavy leakage at phase transition of PCMs severely limit their potential applications . Microencapsulation PCM (MEPCM) is a common technique that can successfully compensate for PCMs’ flaws. , …”

Section: Introductionmentioning

confidence: 99%

“…5 Microencapsulation PCM (MEPCM) is a common technique that can successfully compensate for PCMs' flaws. 6,7 Microencapsulation methods for PCMs include interfacial polymerization, in situ polymerization, sol−gel methods, etc. Interfacial polymerization frequently occurs at the interface of two insoluble liquids in an emulsion.…”

Section: Introductionmentioning

confidence: 99%

Microencapsulation of Phase Change Materials with a Soy Oil-Based Polyurethane Shell via Pickering Emulsion Polymerization

Yan

Ruan

et al. 2023

ACS Appl. Energy Mater.

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Phase change materials (PCMs) have been widely investigated for their ability to store enormous amounts of heat while maintaining ambient temperature during phase transition. In this study, microencapsulation PCMs (MEPCMs) were synthesized using the Pickering emulsion method to address PCMs' defects, such as severe leakage during phase transition. In this paper, modified SiO 2 nanoparticles are used as emulsion stabilizers, and a polyurethane (PU) shell prepared from biobased soy polyols is used to encapsulate PCM ethyl palmitate for the successful fabrication of microcapsules. According to the findings, when the dosage of modified SiO 2 nanoparticles reached 0.5 wt %, the morphologies and mechanical performance of microcapsules reached their optimal condition. Meanwhile, M-SiO 2 -doped microcapsules have greater thermal stability than pure ethyl palmitate. Differential scanning calorimetry (DSC) analysis indicates that when the core−shell ratio grows, the MEPCMs' heat storage capacity increases. The latent heat of MEPCMs reached 118.5 J/g as the core−shell ratio reached 2:1. Additionally, a higher core−shell ratio could help alleviate the supercooling phenomenon of microencapsulation PCMs (MEPCMs). Moreover, the MEPCMs' energy storage efficiency can reach 93.3% after 50 cycles of heat and cold, demonstrating that they have excellent cycle stability.

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“…However, the current preparations of oil-containing capsules were mainly carried out by solvent volatilization or in situ polymerization. Typically, polymers such as polystyrene, polysulfone, polymethyl methacrylate, and urea-formaldehyde , are selected as shell materials, and emulsion droplets of lubricants are used as core materials. It was natural that the capsules were microscale and inhomogeneous; moreover, the morphology was imperfect.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Tribological Properties of Self-Lubricating Epoxy Resins with Oil-Containing Nanocapsules

Xiong

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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The design and development of self-lubricating materials aid in enhancing the tribological performance and prolonging the service life of aero self-lubricating spherical plain bearings. Herein, monodisperse hollow mesoporous carbon nanospheres (HMCNs) with thin shell thickness and uniform particle size were synthesized. Afterward, oil-containing nanocapsules (Oil@HMCNs) were obtained by the impregnation method, which was an innovative approach to prepare nanoscale capsules. The Oil@HMCNs were monodispersed, and the oil content rate could reach 45 wt %. The nanocapsules were applied as additives to achieve the self-lubricating properties of epoxy resin (EP). It was revealed that the coefficient of friction (COF) and the wear rate of EP in dry friction can be decreased from 0.56 to 0.084 and from 50.15 × 10–6 to 0.27 × 10–6 mm3/N/m, respectively. The tribological properties of EP composites in dry friction are better than those of EP with external oil. According to the analysis of friction pairs, the antifriction performance was contributed by the released automatic transmission fluid 6HP (ATF6) from nanocapsules. Meanwhile, the presence of ATF6 effectively could inhibit fatigue wear, and the decrease of compressive strength and surface hardness led to plastic deformation and mechanical polishing. Both resulted in a lower wear rate of EP. In conclusion, this work explored the application possibility of hollow mesoporous materials in lubrication. The prepared EP composites exhibited excellent tribological performances and self-lubricating properties, which were expected to be applied to self-lubricating spherical plain bearings and other mechanical parts.

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Synthesis of paraffin@PS/reduced graphene oxide microcapsules via Pickering emulsion for multi-protective coatings

Cited by 19 publications

References 44 publications

Phase Change Microcapsules with a Polystyrene/Boron Nitride Nanosheet Hybrid Shell for Enhanced Thermal Management of Electronics

Phase Change Microcapsules with a Polystyrene/Boron Nitride Nanosheet Hybrid Shell for Enhanced Thermal Management of Electronics

Microencapsulation of Phase Change Materials with a Soy Oil-Based Polyurethane Shell via Pickering Emulsion Polymerization

Preparation and Tribological Properties of Self-Lubricating Epoxy Resins with Oil-Containing Nanocapsules

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