Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 98: Composites and Functional Polymer Hybrids

CPP 98.5: Vortrag

Donnerstag, 19. März 2020, 16:00–16:15, ZEU 114

Simulations of complex nanoparticles in block copolymer ultrathin films: colloidal anisotropy and inhomogeneity — •Javier Diaz1, Marco Pinna2, Andrei V. Zvelindovsky2, and Ignacio Pagonabarraga11École polytechnique fédérale de Lausanne, Switzerland — 2School of Maths and Physics, University of Lincoln,UK

Block copolymers (BCPs) are perfect candidates to control the position (and orientation, for anisotropic colloids) of nanoparticles (NPs) due to the microphase separation in several ordered morphologies: lamellar, cylinders, etc. Moreover, the presence of nanoparticles can modify the properties of the hosting BCP, including its morphology [1] and result in ordered co-assembled structures.

Anisotropic nanoparticles can display a high ordering within block copolymer ultrathin films, with a rich phase behaviour both in terms of NP position and orientation, depending on relative lengths and interactions with the BCP. We present a computational model [2] that allows to study anisotropic NPs with different shapes (rectangles, ellipsoids and rhomboids), comparing with recent experiments on nanorods and nanoplates.

Chemically inhomogeneous Janus NPs(JNPs) possess an additional orientational degree of freedom that can lead to ordered co-assembled phases with JNPs forming lamellar-like structures within the BCP [3].

[1] Diaz, J., Pinna, M., Zvelindovsky, A. and Pagonabarraga, I., 2019 Soft Matter, 15, 9325-9335 [2] Diaz, J., et al, 2019. Macromolecules 52, 21, 8285-8294 [3] Diaz, J., et al, 2019 Soft matter, 15(31), 6400-6410

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