This work reports on an environmentally friendly method to produce encapsulated phase change material with a thin nickel coating, applicable for heat conversion, storage and thermal management of heat-sensitive components and suitable for active heating by electromagnetic radiation. A critical issue for the metallization is the adhesion between the polymer capsule shell and the metal layer. Based on previous studies using the bio-molecule dopamine as adhesion promoter in composites and for plastics metallization, commercial paraffin microcapsules were coated with an ultrathin polydopamine film via a simple wet chemical process. Subsequently, a thin, uniform and compact nickel layer was produced by electroless metallization. The successful deposition of both layers was verified with a broad range of imaging and spectroscopic techniques. For the first time, surface-enhanced IR spectroscopy was used to study the deposition of ultrathin PDA films. The combination of SEM and energy-dispersive X-ray spectroscopy allowed resolving the spatial distribution of the elements Ni, N, and O in the MC shell. Electrically conducting paths in the Ni shell were verified by conductive AFM. Thermal analysis revealed that the coated microcapsules show a phase change enthalpy of approx. 170 J/g, suitable for thermal storage and management. Additionally, the nickel layer enhanced the thermal diffusivity of the microcapsule powders and enables a fast heating of the PCM microcapsules by microwave radiation, demonstrating the applicability of the metallized MCs for controlled heating applications.[GRAPHICS].

Dopamine as a bioinspired adhesion promoter for the metallization of multi-responsive phase change microcapsules / Zimmerer, C; Fredi, G; Putzke, S; Boldt, R; Janke, A; Krause, B; Drechsler, A; Simon, F. - In: JOURNAL OF MATERIALS SCIENCE. - ISSN 0022-2461. - 57:35(2022), pp. 16755-16775. [10.1007/s10853-022-07658-y]

Dopamine as a bioinspired adhesion promoter for the metallization of multi-responsive phase change microcapsules

Fredi, G;
2022-01-01

Abstract

This work reports on an environmentally friendly method to produce encapsulated phase change material with a thin nickel coating, applicable for heat conversion, storage and thermal management of heat-sensitive components and suitable for active heating by electromagnetic radiation. A critical issue for the metallization is the adhesion between the polymer capsule shell and the metal layer. Based on previous studies using the bio-molecule dopamine as adhesion promoter in composites and for plastics metallization, commercial paraffin microcapsules were coated with an ultrathin polydopamine film via a simple wet chemical process. Subsequently, a thin, uniform and compact nickel layer was produced by electroless metallization. The successful deposition of both layers was verified with a broad range of imaging and spectroscopic techniques. For the first time, surface-enhanced IR spectroscopy was used to study the deposition of ultrathin PDA films. The combination of SEM and energy-dispersive X-ray spectroscopy allowed resolving the spatial distribution of the elements Ni, N, and O in the MC shell. Electrically conducting paths in the Ni shell were verified by conductive AFM. Thermal analysis revealed that the coated microcapsules show a phase change enthalpy of approx. 170 J/g, suitable for thermal storage and management. Additionally, the nickel layer enhanced the thermal diffusivity of the microcapsule powders and enables a fast heating of the PCM microcapsules by microwave radiation, demonstrating the applicability of the metallized MCs for controlled heating applications.[GRAPHICS].
2022
35
Zimmerer, C; Fredi, G; Putzke, S; Boldt, R; Janke, A; Krause, B; Drechsler, A; Simon, F
Dopamine as a bioinspired adhesion promoter for the metallization of multi-responsive phase change microcapsules / Zimmerer, C; Fredi, G; Putzke, S; Boldt, R; Janke, A; Krause, B; Drechsler, A; Simon, F. - In: JOURNAL OF MATERIALS SCIENCE. - ISSN 0022-2461. - 57:35(2022), pp. 16755-16775. [10.1007/s10853-022-07658-y]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/353741
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