Seminar by Prof. Suresh Valiyaveettil, NUS, Visiting Professor, IITB on "Optical properties of perylene encapsulated silica and polymer nanoparticles"

10 Oct 2019
Seminar Room #350
Talk Title : "Optical properties of perylene encapsulated silica and polymer nanoparticles"
Abstract
Fluorescent nanomaterials offer many advantages over conventional molecular dyes. Many perylene based dyes are known in literature owing to their interesting photophysical properties and high stability. Our group is working on chemical modifications of perylene, understanding their structure-property correlations and exploring various applications. Currently, we are investigating the aggregation induced changes in optical properties of perylene dyes incorporated silica nanoparticles. The optical properties of such silica nanoparticles are then compared with the surface functionalized particles. The perylene incorporated nanosilica particles offer a combination of super hydrophobicity and near infrared (NIR) reflectance properties of perylene, which could be used for surface coatings with self-cleaning properties. Similarly, perylene encapsulated soft polymer nanoparticles are prepared in water using a known precipitation method and fully characterised. The absorption and emission spectra of the resultant nanoparticles showed monomeric or excimeric peaks based on the amounts of perylene molecules. Fluorescent polymer nanoparticles are dispersable in water and used for bioimaging and coatings. The talk will provide full details on the synthesis, characterisation and applications of optically active nanoparticles.