Control of thermal barrier performance by optimized nanoparticle size and experimental evaluation using a solar simulator

Gonome, Hiroki; Baneshi, Mehdi; Okajima, Junnosuke; Komiya, Atsuki; Yamada, Noboru; Maruyama, Shigenao

doi:10.1016/j.jqsrt.2014.07.025

Cited by 14 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…24 One of the newest applications of nanopigments in textile industry introduced in recent years, is based on their optical properties, and deals with the alteration of scattering ability of the coated fabrics in different regions of electromagnetic spectrum. 25 This advantage has been utilized to produce fabrics with desired optical properties such as UV-protection, opacity, and NIR reflectance. 1,26 Despite the importance of the issue, there are few investigations on the effect of pigmented coatings on the reflective behavior of coated fabrics.…”

Section: Introductionmentioning

confidence: 99%

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

Piri

Shams‐Nateri

Mokhtari

2018

Color Research & Application

View full text Add to dashboard Cite

The particle size parameter is a key factor that affects radiative properties of nanopigments, and consequently, pigments of the same type but different sizes represent different spectral performance. Therefore, current study dealt with a systematic experimental investigation on the effect of TiO2 pigmented coatings on spectral reflectance and color performance of white and colored polyester fabrics in UV, VIS, and NIR region of electromagnetic spectrum, with a special emphasis on VIS region. In order to accomplish this target, polyester fabrics were coated with TiO2 nanopigment with various concentrations and different diameters, and their reflectance spectra were measured using spectrophotometric method. Two‐way analysis of variance (ANOVA) was utilized to investigate the significance of the effect of TiO2 nanopigment on the color performance of coated fabrics. According to experimental observations, an organized color shift appears in color coordinate of fabrics coated with TiO2 nanopigment of various sizes. Moreover, although TiO2 nanopigment with 35 nm diameter has the most significant impact on short wavelength region (UV region), the effect of pigment with 250 nm diameter is more noticeable on NIR region as long wavelength region.

show abstract

Section: Introductionmentioning

confidence: 99%

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

Piri

Shams‐Nateri

Mokhtari

2018

Color Research & Application

View full text Add to dashboard Cite

show abstract

“…To quantitatively evaluate the performance in maintaining the visual quality of skin, the difference of the visible reflectance is calculated according to Equation (9). Figure 5 shows the effect of the particle diameter on the difference of the visible reflectance.…”

Section: Difference Of Visible Reflectancementioning

confidence: 99%

“…Although NIR radiation comprises 52% of the energy of sunlight, no cosmetics exist that control NIR radiation. Meanwhile, Gonome et al developed a spectral selective coating pigmented by nano/microparticles to reflect NIR light for industrial use [8,9]. Álvarez-Docio et al also developed CoAl 2 O 4 pigments for NIR light reflection and discussed the effects of the morphology and dispersion of the particles [10].…”

Section: Introductionmentioning

confidence: 99%

Optimization Method for Developing Spectral Controlling Cosmetics: Application for Thermal Barrier Cosmetic

Gonome

Yamada

2018

Coatings

Self Cite

View full text Add to dashboard Cite

Abstract:In this paper, a method of optimizing a thermal barrier cosmetic and spectral selective cosmetic by controlling the particle size and material is proposed as a countermeasure to heatstroke. The radiative properties of single cosmetic particles of a wide range of particle sizes and wavelengths in non-absorbing air were calculated in this study based on the Mie theory. Al 2 O 3 , TiO 2 , Au, and Ag were used as the material of the cosmetic particle. The radiative property of a particle cloud in dependent scattering was calculated. The radiative transfer in the cosmetic layer was analyzed, and the spectral reflectance of the cosmetic layer on the human skin was calculated. A new parameter was defined to quantitatively evaluate the performance of the thermal barrier cosmetic and spectral selective cosmetic. For the thermal barrier cosmetic, the Al 2 O 3 particle was determined to be suitable, and its size was optimized. For the spectral selective cosmetic, the Au particle was likewise determined to be suitable, and its size was optimized. Our cosmetics satisfied both aesthetic and thermal concerns.

show abstract

“…However, the nanostructures used in these works are complicated and expensive, which will limit their large scale applications. The third approach, which is more scalable, is to embed micro/nano-particles in a matrix to form a coating or cover of selective radiative properties [10][11][12][13][14][15][16][17]. In some works [11][12][13][14][15], a cover foil made of particle embedded polyethylene was designed to have high reflectivity in the solar spectrum and high transparency in the "sky window".…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle embedded double-layer coating for daytime radiative cooling

Huang

Ruan

2017

International Journal of Heat and Mass Transfer

370

166

View full text Add to dashboard Cite

Radiative cooling is a passive cooling method by emitting heat to outer space without energy input. In this work we propose a cost effective double-layer coating embedded with nanoparticles for both nighttime and daytime radiative cooling. The top and bottom layers are acrylic resin embedded with titanium dioxide and carbon black particles, respectively responsible for reflecting the solar irradiation and emitting the heat in the atmospheric transparency window. The carbon black layer is considered as the black substrate. For the top layer, different sizes of titanium dioxide particles are examined, and 0.2 µm radius is found to give the best cooling performance. More than 90% of the solar irradiation can be reflected, and the average emissivity in the atmospheric transparency window is larger than 0.9 in most directions. A daytime net cooling power over 100 W/m 2 is predicted at the ambient temperature. The cooling effect persists even if significant conduction and convection heat exchange is considered.

show abstract

Control of thermal barrier performance by optimized nanoparticle size and experimental evaluation using a solar simulator

Cited by 14 publications

References 17 publications

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

Optimization Method for Developing Spectral Controlling Cosmetics: Application for Thermal Barrier Cosmetic

Nanoparticle embedded double-layer coating for daytime radiative cooling

Contact Info

Product

Resources

About

Control of thermal barrier performance by optimized nanoparticle size and experimental evaluation using a solar simulator

Cited by 14 publications

References 17 publications

The effect of TiO2 nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

The effect of TiO2 nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

Optimization Method for Developing Spectral Controlling Cosmetics: Application for Thermal Barrier Cosmetic

Nanoparticle embedded double-layer coating for daytime radiative cooling

Contact Info

Product

Resources

About

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

The effect of TiO₂ nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions