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    Alternatives to Lime Plaster: Evaluation of Paints with Inorganic Pigments for the Conservation of Heritage Buildings in Peru
    (Multidisciplinary Digital Publishing Institute (MDPI), 2025)
    Lime plaster has historically been a key material in the preservation of architectural heritage in Peru; however, its availability has been restricted by state regulations that limit its production and commercialization. This study evaluates the performance of paints formulated with inorganic pigments extracted from soils in the Cusco valley, combined with natural and synthetic binders, as a sustainable alternative for the protection of heritage buildings in this Andean region characterized by high altitude, wide thermal variations, and high solar radiation. Adhesion, hardness, drying time, and weather resistance tests were conducted according to applicable ASTM standards for architectural coatings. The results show that these formulations exhibit good adhesion to historic surfaces and greater durability against extreme environmental conditions compared to traditional lime plaster. Their potential compatibility with historic substrates and lower environmental impact suggest that these paints represent a viable alternative in sustainable conservation strategies; however, further studies are needed to more accurately characterize the mineralogical composition of the pigments used.
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    Design and Development of a UVC Ray Disinfection System for Personal Protective Equipment in High-Demand Facilities
    (Springer Science and Business Media Deutschland GmbH, 2025)
    Since the latest pandemic, there is an increased demand for personal protective equipment (PPE) such as N95 masks, creating shortages. As a result, the need arises to disinfect and reuse PPE, with UVC ultraviolet radiation being a promising method. The objective was to design and build UVC disinfection equipment for N95 masks that guarantees their effective reuse. A prototype was made for biological validation with Bacillus subtilis and microscopic analysis of fibers in 3 cycles of 5 min of UVC. The final equipment for 32 masks was then built in 5 min according to validated parameters. The results showed that 5 min of UVC significantly reduced the microbial load without affecting the masks. Repetitive irradiation should not exceed 3 cycles. It is concluded that functional equipment was obtained whose parameters guarantee the effective disinfection of N95 masks in the face of the health emergency.
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