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Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles

Multifunctional coatings offer many advantages towards protecting various surfaces. Here we apply aggregation induced segregation of perylene diimide (PDI) to control the surface morphology and properties of silica nanoparticles. Differentially functionalized PDI was incorporated on the surface of s...

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Autores principales: Sriramulu, Deepa, Reed, Ella Louise, Annamalai, Meenakshi, Venkatesan, Thirumalai Venky, Valiyaveettil, Suresh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5099900/
https://www.ncbi.nlm.nih.gov/pubmed/27824064
http://dx.doi.org/10.1038/srep35993
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author Sriramulu, Deepa
Reed, Ella Louise
Annamalai, Meenakshi
Venkatesan, Thirumalai Venky
Valiyaveettil, Suresh
author_facet Sriramulu, Deepa
Reed, Ella Louise
Annamalai, Meenakshi
Venkatesan, Thirumalai Venky
Valiyaveettil, Suresh
author_sort Sriramulu, Deepa
collection PubMed
description Multifunctional coatings offer many advantages towards protecting various surfaces. Here we apply aggregation induced segregation of perylene diimide (PDI) to control the surface morphology and properties of silica nanoparticles. Differentially functionalized PDI was incorporated on the surface of silica nanoparticles through Si-O-Si bonds. The absorption and emission spectra of the resultant functionalised nanoparticles showed monomeric or excimeric peaks based on the amounts of perylene molecules present on the surface of silica nanoparticles. Contact angle measurements on thin films prepared from nanoparticles showed that unfunctionalised nanoparticles were superhydrophilic with a contact angle (CA) of 0°, whereas perylene functionalised silica particles were hydrophobic (CA > 130°) and nanoparticles functionalised with PDI and trimethoxy(octadecyl)silane (TMODS) in an equimolar ratio were superhydrophobic with static CA > 150° and sliding angle (SA) < 10°. In addition, the near infrared (NIR) reflectance properties of PDI incorporated silica nanoparticles can be used to protect various heat sensitive substrates. The concept developed in this paper offers a unique combination of super hydrophobicity, interesting optical properties and NIR reflectance in nanosilica, which could be used for interesting applications such as surface coatings with self-cleaning and NIR reflection properties.
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spelling pubmed-50999002016-11-14 Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles Sriramulu, Deepa Reed, Ella Louise Annamalai, Meenakshi Venkatesan, Thirumalai Venky Valiyaveettil, Suresh Sci Rep Article Multifunctional coatings offer many advantages towards protecting various surfaces. Here we apply aggregation induced segregation of perylene diimide (PDI) to control the surface morphology and properties of silica nanoparticles. Differentially functionalized PDI was incorporated on the surface of silica nanoparticles through Si-O-Si bonds. The absorption and emission spectra of the resultant functionalised nanoparticles showed monomeric or excimeric peaks based on the amounts of perylene molecules present on the surface of silica nanoparticles. Contact angle measurements on thin films prepared from nanoparticles showed that unfunctionalised nanoparticles were superhydrophilic with a contact angle (CA) of 0°, whereas perylene functionalised silica particles were hydrophobic (CA > 130°) and nanoparticles functionalised with PDI and trimethoxy(octadecyl)silane (TMODS) in an equimolar ratio were superhydrophobic with static CA > 150° and sliding angle (SA) < 10°. In addition, the near infrared (NIR) reflectance properties of PDI incorporated silica nanoparticles can be used to protect various heat sensitive substrates. The concept developed in this paper offers a unique combination of super hydrophobicity, interesting optical properties and NIR reflectance in nanosilica, which could be used for interesting applications such as surface coatings with self-cleaning and NIR reflection properties. Nature Publishing Group 2016-11-08 /pmc/articles/PMC5099900/ /pubmed/27824064 http://dx.doi.org/10.1038/srep35993 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Sriramulu, Deepa
Reed, Ella Louise
Annamalai, Meenakshi
Venkatesan, Thirumalai Venky
Valiyaveettil, Suresh
Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title_full Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title_fullStr Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title_full_unstemmed Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title_short Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles
title_sort synthesis and characterization of superhydrophobic, self-cleaning nir-reflective silica nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5099900/
https://www.ncbi.nlm.nih.gov/pubmed/27824064
http://dx.doi.org/10.1038/srep35993
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