| The development of science and technology has promoted the scale of industrialization,but at the same time it has also increased the consumption of fossil energy.Large global temperature differences make people more dependent on thermostats and thus increase energy consumption.Therefore,researching new energy-saving building materials and constructing new energy-saving material structures is not only of great academic significance for reducing energy consumption,but also has important practical application value.Among energy-saving building materials,energy-saving windows have attracted the attention of researchers because of their advantages such as passive heat dissipation and radiant heat management.Because solar radiation is the primary factor that directly affects indoor temperature,energy-saving windows can directly regulate solar radiation energy without consuming additional energy.At present,the main energy-saving window research focuses on regulating solar radiation in the visible region.Although it has obvious control effects,it sacrifices visibility in the visual range of the human eye and is not suitable for daily life.Sunlight has radiant energy equivalent to visible light in the infrared band.Therefore,based on inorganic materials and combining some organic materials,this paper focuses on the construction of ordered structures.The optical properties of energy-saving window devices are mainly studied.The main research contents are as follows:?1?Preparation of ZnO nanorods/Ag hybrid film and its infrared propertiesUsing zinc oxide as a raw material,zinc oxide nanorods having an ordered array structure were constructed by a seed solution method,spin coating calcination method and hydrothermal method,and silver nanoparticles were loaded on the surface by a simple silver mirror reaction.The prepared ZnO nanorods/Ag hybrid film coating exhibited a transmittance of 62%in the visible light band and a reflectance of up to90%in the mid-infrared band.Under the same light conditions,the coating can effectively reduce the temperature by 5?compared to transparent quartz glass.?2?Preparation of SiO2@TiO2/ZnO?STZO?laminated film with anti-reflection,self-cleaning and radiative cooling functions and research on its infrared propertiesFirst,silica nanospheres were prepared by suspension polymerization,and then titanium dioxide was wrapped around the silica nanospheres to build a core-shell structure.The zinc oxide nanorods with the ordered array structure prepared above were used as a base layer,and the titanium dioxide-coated silica core-shell structure was used as an upper layer to construct a laminated film.Compared with the zinc oxide nanorod coating,STZO laminated film can increase the transmittance in the visible light band by 16.67%,has a significant anti-reflection effect,and has only 4.9%transmittance in the ultraviolet band,which can reduce ultraviolet radiation.The STZO laminated film can completely decompose organic matter within 3 hours under ultraviolet light irradiation,and gradually decompose organic dyes under sunlight,which has a good self-cleaning effect.Compared with blank quartz glass,the reflectance of STZO laminated film in the infrared band can reach 55.4%,and through water heating experiments,it can be seen that STZO laminated film can reduce water temperature by4.5?,effectively achieve radiative cooling and reduce energy consumption.?3?Preparation and infrared performance of temperature-sensitive hydrogel hybrid film for full-band thermal managementPNIPAm hydrogel was prepared by free radical polymerization,and silver nanorods were prepared by solvothermal method.Based on PNIPAm hydrogel,acrylic resin was grafted and silver nanorods were doped with different concentrations.Four hydrogel devices with different concentrations of silver nanorods were designed in this experiment.The sample S IV has the strongest ability to regulate sunlight,up to 59.20%,and the value remains almost unchanged after 20 reversible phase transition cycles.Under the same lighting conditions,the smart window device containing PNIPAm-acrylic acid/silver nanorod hydrogel interlayer can effectively reduce the temperature by 12.7?compared with the transparent quartz glass device,and the temperature remains close after cooling.And compared with other phase transition materials that have been reported,the PNIPAm-acrylic acid/silver nanorod hydrogels in this experiment not only have higher visible light transmittance,but also have higher solar light regulation ability,and also have infrared light bands.The obvious control effect indicates that this material is a strong candidate for the construction of smart window materials. |
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