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Synthesis of encapsulation of binary mixture by silica and its performance in pure cementitious system
Author(s) -
Srinivasaraonaik B.,
Sinha Shishir,
Singh Lok P.
Publication year - 2021
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.229
Subject(s) - materials science , differential scanning calorimetry , thermogravimetric analysis , silica fume , fourier transform infrared spectroscopy , cement , scanning electron microscope , crystallinity , cementitious , chemical engineering , compressive strength , composite material , physics , engineering , thermodynamics
Microencapsulation of binary mixture of 75% stearic acid (SA) + 25% capric acid (CA) (as core) has been amalgamated by silica (as shell) through sol‐gel method. The obtained silica binary mixture (Si‐BM) microcapsules was characterized in detail by sophisticated instruments such as field emission scanning electron microscope (FESEM), Fourier transformation infrared spectroscopy (FTIR), X‐ray diffractometer (XRD), differential scanning calorimeter (DSC), and thermogravimetric (TG/DTA) were exploited to identify shape and mean size, functional groups, nature of crystallinity, and weight loss of Si‐BM. The obtained microcapsules were regular in shape, crystalline state, mean size about 6.03 μm and the encapsulation efficiency of Si‐BM found to be 71%. The dissimilar microcapsules such as Si‐BM and melamine formaldehyde phase change material (MF‐PCM) were assimilated (1, 3, and 5 wt%) into cement paste to elucidate thermal‐mechanical properties. As the amount of Si‐BM increases, the compressive strength increased by 10% and thermal conductivity of cement paste is increased by 9% as compared to MF‐PCM. Novelty Statement Encapsulation of binary mixture is synthesized with silica through chemical method. The nonidentical different dosage of microcapsules such as MF‐PCM and Si‐BM were incorporated into pure cement system to determine its effect on mechanical and thermal properties of cementitious system. These data will be useful to further incorporation in mortar and concrete for energy storage as well as thermal load reduction on buildings.