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Active-enhanced core-shell microcapsules for self-healing properties of asphalt mortar
No full textMicrocapsule technology actively repairs microcracks in asphalt pavement, extending its service life. This study develops multi-healing core-shell microcapsules consisting of a core (polyurea formaldehyde sub-capsules containing sunflower oil) and a shell (calcium alginate capsule) that provides protection and enables delayed release. Scanning electron microscopy (SEM) results show the microcapsules have evenly distributed chambers with an average diameter of approximately 2 mm. The core content and encapsulation efficiency are measured at 65.38 % and 78.52 %, respectively, while the shell exhibits an average hardness of 0.27 GPa. Thermogravimetric analysis indicates the microcapsules can withstand high temperatures up to 230℃. Through multiple self-healing tests, the study demonstrates that the core-shell microcapsules provide sustainable and repeated repair effects on asphalt, with an optimal dosage of 1.5 wt% in asphalt mortar. The self-healing effect improves with increasing dosage, healing time, and healing temperature. The microcapsules continuously release rejuvenator, repairing cracks and enhancing asphalt performance
Vpliv UV-stabilizatorjev in količine barvnega koncentrata na barvno in mehansko obstojnost izdelkov, narejenih po rotoliv postopku
No full textA sulfoxide-functionalized graphitic carbon nitride–cobalt dialkyl phosphate bipyridine heterojunction for photocatalytic hydrogen production
No full textOptimizacija mehanske zmogljivosti troslojnih kompozitov z uporabo tehnologije rotacijskega litija
No full textImproved thermal stability of dielectric properties and energy storage properties of lead-free relaxor ▫▫ ceramics
No full textEnvironmentally friendly perovskite ceramics Ba(1-x)LaxTi0.89Sn0.11O3 with x = 0, 0.015, 0.025, and 0.035 (BLTSnx) were synthesized by solid-state reaction method. The enhanced energy storage properties were studied across the ferroelectric relaxor conversion. The pure perovskite structure of all prepared samples was confirmed by X-ray diffraction (XRD) analysis and the Raman spectroscopy technique. Scanning electron microscopy micrographs show a drastic decrease in the grain size in La-doped ceramics. Furthermore, the doped samples exhibit smeared phase transition and frequency dispersion in dielectric permittivity, typical for relaxors. The P-E hysteresis loops become thin with the increase of the La-doping, demonstrating the ferroelectric-relaxor phase conversion. The improved recovered energy density and the energy storage efficiency of 158.8 mJ/cm3 and 82.73 % were observed in the BLTSn2.5 sample at room temperature, respectively. These properties indicate that environmentally friendly BLTSn2.5 is a viable candidate for energy-storage capacitor applications near room temperature
