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Interface and Morphology Control of the Thermal Conductivity in Core--Shell Particle Colloidal Crystals

Title data

Ruckdeschel, Pia ; Retsch, Markus:
Interface and Morphology Control of the Thermal Conductivity in Core--Shell Particle Colloidal Crystals.
In: Advanced Materials Interfaces. Vol. 4 (10 November 2017) Issue 24 .
ISSN 2196-7350
DOI: https://doi.org/10.1002/admi.201700963

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
VolkswagenStiftung

Abstract in another language

The thermal transport properties of nanostructured composite colloidal assemblies are investigated. These are of importance for future phase change material applications, which increasingly address the micrometer and sub-micrometer ranges. Polystyrene silica core–shell colloidal particles sizes of 270–480 nm and shell thicknesses of 15–42 nm are used as a structurally well-defined model system. This allows deducing precise structure property relationships with the lowest thermal conductivity being observed for particles with a large diameter, a thin shell thickness, and the highest polymer content. Importantly, clear evidence is found for polymer leakage through 15 nm silica shells when exceeding the glass transition temperature of the core polymer. This leads to a steady increase in thermal conductivity but also presents a lower limit for the silica shell thickness to contain the second phase. For a complete understanding, the findings are discussed in the light of colloidal crystals consisting of pure silica and polystyrene particles. Solid silica sphere colloidal crystals possess the highest thermal conductivity, and pure polymer beads the lowest. This demonstrates to which extent the thermal transport properties can be solely adjusted by the particle composition and morphology.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry I - Univ.-Prof. Dr. Stephan Förster
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Collaborative Research Centers, Research Unit
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 22 Jan 2018 08:51
Last Modified: 22 Jan 2018 08:51
URI: https://eref.uni-bayreuth.de/id/eprint/41764