03366nas a2200409 a 4500 20260818214551.0 230203s2022 th a ||| 000 eng d .b12398251 AIT Thesis no.ISE-22-08 Sirada Janjaochay Sol-gel synthesis of core-shell metal oxide nanoparticles and their application in NIR reflective coatings Pathum Thani : Asian Institute of Technology, 2022 83 p. : ill. Thesis ; no. ISE-22-08 Thesis (M. Eng.) - Asian Institute of Technology, 2022 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Nanotechnology With the increasing human population, the number of human-made architectures increases along with the people. The architectures release heat slower than natural infrastructures and destroy the heat cycle leading to the collected heat, especially in the city. This occurrence is called the urban heat island effect. Along with many solutions of city design, green infrastructures, and policies, the near-infrared (NIR) reflective structures are promising solutions to the issue. Coating with NIR reflective pigments, human-made architectures can obtain the cooling effect where the absorbed heat is decreased. TiO2 is one of the most popular materials that provide high NIR reflectance to the pigments. This work reports core-shell nanostructures of metal oxides-TiO2 since the core-shell structures prevent the nanoparticles' agglomeration and enhance the pigments' NIR reflectivity. The possible metal oxides cores are Cr2O3, Al2O3, and Fe2O3 nanoparticles, which are commercially available. In addition, sol-gel synthesis of the NIR reflective pigments is a simple, low-cost, and environmentally friendly approach. The possible factors that affect the NIR reflectance of the nanoparticles are investigated, such as the thickness of the TiO2 shell, nanoparticle sizes, and fabrication conditions. The synthesized nanoparticles are then be analyzed with characterization tools, such as transmission electron microscopy, UV-vis-NIR spectrophotometer, etc., to study the properties and the cooling effect obtained from the coating of these pigments. Near infrared reflectance spectroscopy Nanoparticles Bora, Tanujjal, Chairperson Sitthisuntorn Supothina, Co-Chairperson Ricco, Raffaele, Examination committee Salam, Abdul P., Examination Committee Royal Thai Government Fellowship, Scholarship Donor Asian Institute of Technology. Thesis ; no. ISE-22-08 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18182 .b12398251 mnait m 250421 0 230203 m a m 0 mnarc mnarc 67 40 Barcode : - CREATED : 2023-01-02 RECORD # : i13428986 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121041684 CREATED : 2023-02-13 RECORD # : i13432072 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 109046 109046 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ISE-22-08 2026-08-18 21:45:51 2026-08-18 67 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ISE-22-08 30050121041684 2026-08-18 21:45:51 1 2026-08-18 40