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Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.

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Title: Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.
Authors: Minei, Pierpaolo1 (AUTHOR), Lessi, Marco1 (AUTHOR), Contiero, Luca2 (AUTHOR), Borsacchi, Silvia3,4 (AUTHOR), Martini, Francesca1,4 (AUTHOR), Ruggeri, Giacomo1,4 (AUTHOR), Geppi, Marco1,4 (AUTHOR), Bellina, Fabio1 (AUTHOR), Pucci, Andrea1,4 (AUTHOR) andrea.pucci@unipi.it
Source: Solar Energy. Mar2020, Vol. 198, p689-695. 7p.
Subjects: Organic coatings, Perylene, Acrylic coatings, Optical properties, Microspheres, Reflectance, Time management
Abstract: • Paliogen black was utilized as cool organic pigment. • Waterborne acrylic coatings were obtained on white and black substrates. • Thermoplastic hollow microspheres were utilized to boost NIR reflectivity. • SR measurements allowed to determine the cooling features of the prepared coatings. This study reports for the first time the use of thermoplastic hollow microspheres (THM) in combination with a perylene bisimide pigment (Paliogen® Black L0086 (P-black)) for the preparation of acrylic coatings with near-infrared (NIR) reflecting and cooling characteristics. VIS-NIR spectra showed that P-black solid dispersions provide reflectance values in agreement with the P-black content and its crystalline nature. The introduction of THM with average diameter of 25 ± 5 μm with the same weight content of P-black did not substantially affect the crystalline nature of the pigment within the organic coating even if a decreasing of the long range order in the molecular packing of the perylene chromophores emerged from XRD and solid-state NMR investigations. Noteworthy, the addition of the THM successfully contributed in the exponential raising of the solar reflectance (SR) of coated black substrates, i.e. reaching up to the 22% at the highest organic layer thickness of 255 μm. The effective combination between THM and P-black was well reflected on the temperature of the back side of the coated surface after irradiation with a solar simulator, i.e. with a maximum cooling effect of about 6 °C. [ABSTRACT FROM AUTHOR]
Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 141735381
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.
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  Data: <searchLink fieldCode="JN" term="%22Solar+Energy%22">Solar Energy</searchLink>. Mar2020, Vol. 198, p689-695. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Organic+coatings%22">Organic coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Perylene%22">Perylene</searchLink><br /><searchLink fieldCode="DE" term="%22Acrylic+coatings%22">Acrylic coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Microspheres%22">Microspheres</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance%22">Reflectance</searchLink><br /><searchLink fieldCode="DE" term="%22Time+management%22">Time management</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: • Paliogen black was utilized as cool organic pigment. • Waterborne acrylic coatings were obtained on white and black substrates. • Thermoplastic hollow microspheres were utilized to boost NIR reflectivity. • SR measurements allowed to determine the cooling features of the prepared coatings. This study reports for the first time the use of thermoplastic hollow microspheres (THM) in combination with a perylene bisimide pigment (Paliogen® Black L0086 (P-black)) for the preparation of acrylic coatings with near-infrared (NIR) reflecting and cooling characteristics. VIS-NIR spectra showed that P-black solid dispersions provide reflectance values in agreement with the P-black content and its crystalline nature. The introduction of THM with average diameter of 25 ± 5 μm with the same weight content of P-black did not substantially affect the crystalline nature of the pigment within the organic coating even if a decreasing of the long range order in the molecular packing of the perylene chromophores emerged from XRD and solid-state NMR investigations. Noteworthy, the addition of the THM successfully contributed in the exponential raising of the solar reflectance (SR) of coated black substrates, i.e. reaching up to the 22% at the highest organic layer thickness of 255 μm. The effective combination between THM and P-black was well reflected on the temperature of the back side of the coated surface after irradiation with a solar simulator, i.e. with a maximum cooling effect of about 6 °C. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.solener.2020.02.017
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 689
    Subjects:
      – SubjectFull: Organic coatings
        Type: general
      – SubjectFull: Perylene
        Type: general
      – SubjectFull: Acrylic coatings
        Type: general
      – SubjectFull: Optical properties
        Type: general
      – SubjectFull: Microspheres
        Type: general
      – SubjectFull: Reflectance
        Type: general
      – SubjectFull: Time management
        Type: general
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      – TitleFull: Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.
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              M: 03
              Text: Mar2020
              Type: published
              Y: 2020
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