Near-infrared solar reflectance and chromaticity properties of novel green ceramic pigment Cr-doped Y3Al5O12

2021 ◽  
pp. 122873
Author(s):  
Chenlu Chen ◽  
Aijun Han ◽  
Mingquan Ye ◽  
Xin Chen ◽  
Jieyu Wang
Keyword(s):  
Near Infrared ◽  
Ceramic Pigment ◽  
Solar Reflectance

scholarly journals Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

2021 ◽  
Vol 6 (6) ◽  
pp. 79
Author(s):  
Nuno M. M. Ramos ◽  
Joana Maia ◽  
Andrea R. Souza ◽  
Ricardo M. S. F. Almeida ◽  
Luís Silva
Keyword(s):  
Surface Layer ◽  
Surface Temperature ◽  
Near Infrared ◽  
Building Performance ◽  
Colour Difference ◽  
Colour Perception ◽  
Composite Systems ◽  
Solar Reflectance ◽  
Building Cooling ◽  
The Impact

Near-infrared (NIR) reflective materials are being developed for mitigating building cooling needs. Their use contributes to broadening the range of colours, responding to the urban aesthetic demand without compromising the building performance. Despite the increase in NIR reflective pigments investigation, there is still a knowledge gap in their applicability, impact, and durability in multilayer finishing coatings of External Thermal Insulation Composite Systems (ETICS). Hence, the main goal of this work consists of evaluating the impact of incorporating NIR reflective pigments (NRP) in the solar reflectance of the surface layer of ETICS, without affecting the colour perception, as well as their influence on the colour durability and surface temperature. As such, colour, solar reflectance, and surface temperature were monitored for 2 years in dark-coloured specimens of ETICS, with and without NRP and a primer layer. It was confirmed that the main contribution of NRP is the increase of solar reflectance and, consequently, the decrease in surface temperature, especially for high exterior temperatures (around 30 ºC). Moreover, these pigments highly increase the NIR reflectance without affecting the visible colour. In addition, they contribute to maintaining the colour characteristics. The application of primer increased the surface temperature, especially for higher exterior temperatures. However, it contributes to a lower colour difference and solar reflectance variation, which is an important achievement for durability purposes.

Synthesis and characterization of black pigments based on calcium manganese oxides for high near-infrared (NIR) reflectance

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90952-90957 ◽  
Author(s):  
Ryohei Oka ◽  
Toshiyuki Masui
Keyword(s):  
Manganese Oxides ◽  
Near Infrared ◽  
Barrier Properties ◽  
Black Pigment ◽  
Synthesis And Characterization ◽  
Thermal Barrier ◽  
Solar Reflectance

Ca2Mn0.85Ti0.15O4 was synthesized as an inorganic black pigment with thermal barrier properties, and its NIR solar reflectance value was much greater than those of the conventional NIR reflective black pigments.

Synthesis, Characterization, and Optical Properties of Near-Infrared Reflecting Composite Inorganic Pigments Composed of TiO2/CuO Core–Shell Particles

2018 ◽  
Vol 71 (5) ◽  
pp. 373 ◽  
Author(s):  
Bolong Yao ◽  
Siyao Geng ◽  
Jie Wang ◽  
Likui Wang
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Near Infrared ◽  
Diffuse Reflectance Spectroscopy ◽  
Infrared Region ◽  
Molar Ratio ◽  
Core Shell ◽  
Near Infrared Reflectance ◽  
Cu Content ◽  
Solar Reflectance

Pigments with dark appearance and high solar energy reflectance are of great application value. In the present work, dark grey composite pigments with a TiO2/CuO core–shell structure were prepared through calcination of precursors obtained from the precipitation of Cu(OH)2 on TiO2 particles. The composition, structure, and optical properties of the synthesised powders were characterised by colourimetry, near-infrared diffuse reflectance spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The pigments are composed of rutile TiO2 and tenorite CuO, and the powder colour changes from white to dark grey as the Cu content increases. With a molar ratio of CuO to TiO2 of 0.6, the pigment presents optimal colour (a* = 1.66, b* = −2.19, L* = 52.37) and optical performance. The near-infrared reflectance, the solar reflectance in the near-infrared region, and the total solar reflectance reach 87.2, 70.6, and 37.2 %, respectively. Furthermore, it is demonstrated that the composite pigments exhibit a deeper colour and higher reflectivity than conventional dark-blended powders. These cool dark pigments could be applied in the coatings for buildings (roofs and walls) to improve building comfortability and reduce cooling energy consumption.

Yellowish-Brown Pigment with High near Infrared Reflective

2014 ◽  
Vol 979 ◽  
pp. 102-106
Author(s):  
Thadsanee Thongkanluang ◽  
Jantharat Wutisatwongkul ◽  
Prayoon Surin
Keyword(s):  
Near Infrared ◽  
Colour Index ◽  
Brown Pigment ◽  
Inorganic Pigments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solar Reflectance ◽  
New Phase ◽  
Host Component

Yellowish-brown inorganic pigments having a high near infrared solar reflectance have been synthesized. In this research, Fe2O3 was used as the host component, whereas, the mixtures of Sb2O3, SiO2, Al2O3, and TiO2 were used as the guest components. The guest components were investigated over a range of 36 different compositions. The results showed that the pigment, denoted by YB32, with a composition of Fe2O3, Sb2O3, SiO2, Al2O3, and TiO2 of 65, 15, 10, 2 and 8 wt.% respectively, generated a maximum near infrared solar reflectance of 40.8% while the YB3 pigment was found to have a minimum reflectance of 29.3%. The CIE L*a*b* colour index was used to measure the yellowish-brown pigment colours. The YB32 and YB3 pigment powders were also characterized by powder X-ray diffraction technique. It was found that the YB3 powder developed a new phase, FeSb2O3, which is mainly responsible for the decrease in the near infrared solar reflectance.

Performance of Near-Infrared Reflective Tile Roofs

2013 ◽  
Vol 770 ◽  
pp. 30-33 ◽  
Author(s):  
Thadsanee Thongkanluang ◽  
Jantharat Wutisatwongkul ◽  
Neramitr Chirakanphaisarn ◽  
Artorn Pokaipisit
Keyword(s):  
Near Infrared ◽  
Comparison Study ◽  
Cool Roof ◽  
Solar Reflectance ◽  
Green Pigments ◽  
Cool Roofs ◽  
Host Component

A green pigments based on a Cr2O3-Al2O3-V2O5-TiO2composition have been synthesized and the ability of these pigments used with ceramic glazes to confer high solar reflectance has also been studied. Cr2O3is the host component and the adding mixtures of Al2O3, V2O5and TiO2as the guest components. The composition denoted by T1 composes of Cr2O3, TiO2, Al2O3and V2O5are 80, 4, 14 and 2 wt%, respectively, gives near infrared solar reflectance of 82.8%. T1 green pigments were prepared for ceramic cool tile roofs (denoted by T1 cool roof). The comparison study on the effectiveness of T1 ceramic cool roofs and a commercial ceramic cool tile roofs (denoted by C cool roof) show that the T1 cool roof has given a better result by keeping the tested room about 4 °C cooler.

scholarly journals Hydrothermal synthesis and characterization of novel yellow pigments based on V5+ doped BiPO4 with high near-infrared reflectance

RSC Advances ◽  
2018 ◽  
Vol 8 (35) ◽  
pp. 19690-19700 ◽  
Author(s):  
Cheng Ding ◽  
Aijun Han ◽  
Mingquan Ye ◽  
Yu Zhang ◽  
Lingyun Yao ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Near Infrared ◽  
Synthesis And Characterization ◽  
Infrared Reflectance ◽  
Near Infrared Reflectance ◽  
Solar Reflectance ◽  
Yellow Pigments

A series of new yellow pigments was synthesized (BiP1−xVxO4), coatings colored with synthesized pigments have high NIR solar reflectance.

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

A nitroreductase-activatable near-infrared theranostic photosensitizer for photodynamic therapy under mild hypoxia

2020 ◽  
Vol 56 (43) ◽  
pp. 5819-5822
Author(s):  
Jing Zheng ◽  
Yongzhuo Liu ◽  
Fengling Song ◽  
Long Jiao ◽  
Yingnan Wu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Triplet State ◽  
Near Infrared ◽  
Mild Hypoxia

In this study, a near-infrared (NIR) theranostic photosensitizer was developed based on a heptamethine aminocyanine dye with a long-lived triplet state.

Fluorescent proteins for in vivo imaging, where's the biliverdin?

2020 ◽  
Vol 48 (6) ◽  
pp. 2657-2667
Author(s):  
Felipe Montecinos-Franjola ◽  
John Y. Lin ◽  
Erik A. Rodriguez
Keyword(s):  
Hydrogen Peroxide ◽  
In Vivo Imaging ◽  
Near Infrared ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Fluorescent Imaging ◽  
Infrared Light ◽  
Red Fluorescent Protein ◽  
Color Palette

Noninvasive fluorescent imaging requires far-red and near-infrared fluorescent proteins for deeper imaging. Near-infrared light penetrates biological tissue with blood vessels due to low absorbance, scattering, and reflection of light and has a greater signal-to-noise due to less autofluorescence. Far-red and near-infrared fluorescent proteins absorb light >600 nm to expand the color palette for imaging multiple biosensors and noninvasive in vivo imaging. The ideal fluorescent proteins are bright, photobleach minimally, express well in the desired cells, do not oligomerize, and generate or incorporate exogenous fluorophores efficiently. Coral-derived red fluorescent proteins require oxygen for fluorophore formation and release two hydrogen peroxide molecules. New fluorescent proteins based on phytochrome and phycobiliproteins use biliverdin IXα as fluorophores, do not require oxygen for maturation to image anaerobic organisms and tumor core, and do not generate hydrogen peroxide. The small Ultra-Red Fluorescent Protein (smURFP) was evolved from a cyanobacterial phycobiliprotein to covalently attach biliverdin as an exogenous fluorophore. The small Ultra-Red Fluorescent Protein is biophysically as bright as the enhanced green fluorescent protein, is exceptionally photostable, used for biosensor development, and visible in living mice. Novel applications of smURFP include in vitro protein diagnostics with attomolar (10−18 M) sensitivity, encapsulation in viral particles, and fluorescent protein nanoparticles. However, the availability of biliverdin limits the fluorescence of biliverdin-attaching fluorescent proteins; hence, extra biliverdin is needed to enhance brightness. New methods for improved biliverdin bioavailability are necessary to develop improved bright far-red and near-infrared fluorescent proteins for noninvasive imaging in vivo.

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