Effect of titanium dioxide (TiO2) with different crystal forms and surface modifications on cooling property and surface wettability of cool roofing materials

Qi, Yanli; Xiang, Bo; Zhang, Jun

doi:10.1016/j.solmat.2017.07.017

Cited by 69 publications

(19 citation statements)

References 51 publications

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“…For the heat loss by thermal conduction with the solid, ds is the thickness of the substrate (ds=500 μm for SiO2/Si substrate) and λs is the heat conductivity of Si which is the main material of the substrate (λs=130 Wm -1 K -1 ). In the last term of Equation 2, the emissivity is =0.8 [54]. 3 [55], the radius of the spherical cap in contact can be deduced.…”

Section: Chemical Analysis Of the Plasma-treated Nanostructured Tio2 mentioning

confidence: 99%

Modification of the optical properties and nano-crystallinity of anatase TiO2nanoparticles thin film using low pressure O2 plasma treatment

et al. 2020

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TiO2 nanoparticles (NPs) thin films with a thickness of 50 nm and a coreshell nanostructure were prepared using the spin coating technique and were treated using an inductively coupled O2 plasma at low pressure. While no significant features were observed during pumping, two kinetics can be identified during plasma processing using in situ spectroscopic ellipsometry. For very short plasma treatment times, the removal of solvent-based organic moieties surrounding TiO2 nanoparticles produces a densification of the inorganic TiO2 films. Such mineralization effect by the O2 plasma treatment was confirmed by X-ray photoelectron microscopy. For larger time scales, the average size of TiO2 NPs rises and significant changes of the optical properties occur. While no significant changes in the film nanostructure were observed by Scanning Electron Microscopy, a rise in the crystallite size and an increase in the agglomeration of TiO2 nanoparticles were confirmed by Transmission Electron Microscopy and Atomic Force Microscopy, respectively. The mechanisms involved in such plasma-induced modification of nanostructured TiO2 thin films are discussed in line with the energy fluxes of plasma-generated species.

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Section: Chemical Analysis Of the Plasma-treated Nanostructured Tio2 mentioning

confidence: 99%

Modification of the optical properties and nano-crystallinity of anatase TiO2nanoparticles thin film using low pressure O2 plasma treatment

et al. 2020

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“…Under this premise, metal, metal oxide, hollow glass beads, fly ash beads and ceramic beads, and other materials with higher reflectivity are mainly selected as functional fillers when reflective thermal insulation coatings are prepared. But it is worth noting that, not only the color but also the structure of fillers affects the thermal insulation performance of the film; for example, metal oxide fillers with nanocrystal structure have better near-infrared reflectivity, which means better thermal insulation performance than with ordinary structure of metal oxide fillers [24][25][26].…”

Section: Reflective Thermal Insulation Coatingsmentioning

confidence: 99%

Thermal Insulation Coatings in Energy Saving

Ye¹,

Chen²

2019

Energy-Efficient Approaches in Industrial Applications

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The surface temperature of object rises due to the accumulated heat when it absorbs solar energy, the excessive temperature caused by solar radiation will result in many inconveniences and even troubles in industrial production and daily life; in order to maintain the proper temperature of the object, a large amount of energy is consumed. The development of effective and economic thermal insulation materials is the key to meet the urgent needs for energy saving and emission reduction. In the face of variety of choices of thermal insulation materials, thermal insulation coating become more and more popular due to its good thermal insulation performance, economic, easy to use, and adaptability for a wide range of substrates. With the thermal insulation functional fillers (briefly called fillers in the following text) in coating system, the films can show a certain thermal insulation effect by reflecting, radiating, or isolating heat. As a result, when covered by thermal insulation coatings, the surface temperature of object would be greatly decreased. In this case, a large amount of energy consumed for cooling down the objects exposed to sunlight could be saved, which means the energy consumption can be reduced effectively by just covering with a thermal insulation coating on the surface of object.

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“…Reflective cool material is the most common means of solving these problems . Traditional reflective cool materials usually add high refractive index inorganic particles for high reflectance, thereby shielding most of the solar energy to achieve cooling effect . Nonwhite cool materials based on the study of reflective cool materials could have further broaden the use scope of cool materials in different regions by reducing possible optical pollution …”

Section: Introductionmentioning

confidence: 99%

Incorporation of indolinospirooxazine on ethylene‐vinyl acetate copolymer to produce a intelligently temperature‐regulated nonwhite cool material

Zhang

2019

J of Applied Polymer Sci

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Cool materials that adjust cooling efficiency according to sunlight intensity are needed because people have different needs for cooling at different times. Several colors of commercial microencapsulated photochromic powder were melt blended with ethylene-vinyl acetate copolymer in a two-roll mill at 90 C to prepare the photochromic films of corresponding colors. Pink photochromic films [the organic photochromic compound is indolinospirooxazine (NISO)] were selected to continue the following variable experiment due to its best performance in the indoor cooling test. The pink photochromic films change color as well as transmittance according to the intensity of sunlight, thereby achieving an intelligent cooling effect. A maximum decrease around 10 C was observed in natural environment when the addition amount of pink photochromic powder reaches 2.0 phr under strong sunlight and all films did not show cooling effect under weak sunlight. This material can be covered on buildings to regulate the indoor temperature.

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Effect of titanium dioxide (TiO2) with different crystal forms and surface modifications on cooling property and surface wettability of cool roofing materials

Cited by 69 publications

References 51 publications

Modification of the optical properties and nano-crystallinity of anatase TiO2nanoparticles thin film using low pressure O2 plasma treatment

Modification of the optical properties and nano-crystallinity of anatase TiO2nanoparticles thin film using low pressure O2 plasma treatment

Thermal Insulation Coatings in Energy Saving

Incorporation of indolinospirooxazine on ethylene‐vinyl acetate copolymer to produce a intelligently temperature‐regulated nonwhite cool material

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