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Hybrid acrylic/CeO2 nanocomposites using hydrophilic, spherical and high aspect ratio CeO2 nanoparticles
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik. SP Technical Research Institute of Sweden, Sweden.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.ORCID-id: 0000-0003-3201-5138
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2, nr 47, s. 20280-20287Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A dispersion of CeO2 nanoparticles and nanorods stabilized with nitrilotriacetic acid (NTA) and a 4,4'-azobis(4-cyanovaleric acid) (V-501) initiator has been used to initiate the emulsion polymerization of acrylic monomers, yielding stable hybrid CeO2 nanoparticle-nanorod/polyacrylate latexes for the first time. Films cast from these hybrid latexes are transparent due to the very homogenous distribution of the polymer compatibilized CeO2. Furthermore, it has been proven that the UV-Vis absorption capacity of the hybrid latexes is enhanced with the incorporation of the nanorods.

Ort, förlag, år, upplaga, sidor
2014. Vol. 2, nr 47, s. 20280-20287
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-158853DOI: 10.1039/c4ta03620dISI: 000345066900044Scopus ID: 2-s2.0-84910136292OAI: oai:DiVA.org:kth-158853DiVA, id: diva2:782244
Anmärkning

QC 20150120

Tillgänglig från: 2015-01-20 Skapad: 2015-01-12 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Ceria Nanoparticle Hybrid Materials: Interfacial Design and Structure Control
Öppna denna publikation i ny flik eller fönster >>Ceria Nanoparticle Hybrid Materials: Interfacial Design and Structure Control
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This doctoral thesis addresses the challenge of bringing two very different materials into intimate chemical contact: inorganic metal oxide nanoparticles and acrylic polymers. In order to achieve this ambitious goal, the work has been divided into a series of more accessible tasks. Pedagogically designed, these tasks build upon one another to finally develop the knowledge and skills necessary to successfully formulate novel nanocomposites.

A fundamental study on the bulk and surface bonding of ceria was carried out to show that, due to the ceria content in small and highly charged ions, which are difficult to polarize, the preferred chemical interactions are ionic. Among the different capping agents, the carboxylate ligands —through the rich and localized electron density of their oxygen atoms— formed an ionic bond with cerium oxides. This provided stability to the ceria nanoparticles and opened up a vast robust and versatile library of carboxylates to us. This is exemplified by the development of synthetic routes for understanding and modifying ceria nanoparticles with carboxylic acids carrying reactive moieties, which were used to extend the stability of the nanoparticle dispersions. This allowed us to perform in situ polymerization, which resulted in homogeneous ceria–polymer hybrid nanocomposites. This interfacial design offers not only structure control but also strong bonding between the covalent polymer network and the ionic nanocrystals.

The focus of the present work, however, is not on characterization of the polymeric materials used but rather on how the embedded nanoparticles interact with the polymeric matrix with respect to chemical interfacial aspects. The following cases were studied: i) unreactive nanoceria dispersed in a polymer matrix; ii) dispersed nanoceria endowed with the ability to initiate polymerizations; and iii) dispersed nanoceria capable of copolymerizing with the propagating chains of the polymer.

These processes led to the development of novel hybrid nanocomposites that preserved the optical properties of ceria (e.g. UV absorption) while enhancing mechanical properties such as stiffness and glass transition temperature.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2015. s. xviii, 124
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:46
Nationell ämneskategori
Polymerkemi
Identifikatorer
urn:nbn:se:kth:diva-173367 (URN)978-91-7595-674-9 (ISBN)
Disputation
2015-09-18, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20150910

Tillgänglig från: 2015-09-10 Skapad: 2015-09-10 Senast uppdaterad: 2015-09-10Bibliografiskt granskad

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Johansson, Mats

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Johansson Salazar-Sandoval, EricJohansson, Mats
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Totalt: 765 träffar
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