Directed Colloidal Structure at the Meso-Scale

Leistungen

Quantifying and controlling dynamics through rod characteristics

We will study the effects of particle characteristics length aspect ratio flexibility on single particle Brownian dynamics i Single rod dynamics in highly ordered phases ii Effect of nearby phase transitions on the collective dynamics Novel theoretical models will be applied using a grand canonical description mimicking the experiments Experiments on cellulose and thermoresponsive rods to approach phase transitions will provide validation of the modelling using highspeed cameras to capture so far inaccessible relevant times scales

Directing the meso-phase structure by shear flow

Large oscillatory strains and steady shear flow will be applied to study shear-induced alignment of isotropic states and the distortion and melting of ordered LC phases.

Directing structure via chirality

We will study the competition between chiralityinduced twist and longrange positional order on the cholesteric phase and the structure of higherorder liquid crystalline states by tuning the molecular chirality using mixtures of two mutants with opposite chiral handedness in combination with Xray scattering and fluorescence microscopy

Understanding the molecular origin of dynamically percolated states

We investigate i The kinetic pathways that dominate temporal network formation in dispersions of rodlike particles ii If translational andor rotational motion provide the main route towards buildup and breakdown of cluster networks iii The structure of the clusters for various types of interaction and external fields including flow iv Whether the proximity to LC phases impacts upon the cluster size and structure and if this affects the percolation threshold We will use simulations dynamical connectedness percolation theory and in experiment a combination of dielectric spectroscopy optical microscopy rheology and radiation scattering

Final report on WP1.2 and 1.3

Final report on sub-WPs 1.2 and 1.3; This is a follow-up on deliverables D1.3-1.5

Control of structure via confinement and quantification of the dynamics

We will study the competition between Frank elasticity surface anchoring and interfacial tensions via confinement and study the underlying dynamics

Properties of the IN interface of entropy-dominated systems

Create isotropic and nematic droplets to control the interplay between surface tension and Frank elasticity beyond the predetermined IN structures using microfluidics Probe the structural behaviour of LC interfaces to understand interface behaviour of entropydominated systems

State diagram of the arrested states

We will measure a state diagram for glass and gel formation as a function of rod characteristics and interactions The experimental systems provide tuneable repulsive and attractive interactions

Quantifying and controlling dynamics through interactions and concentration

We will study effect of system characteristics interactions concentration on structure and single particle Brownian dynamics i Single rod dynamics in highly ordered phases ii Effect of nearby phase transitions on the collective dynamics Novel theoretical models will be applied using a grand canonical description mimicking the experiments in WP 11 and 21 Experiments on cellulose and thermoresponsive rods to approach phase transitions will provide validation of the modelling using highspeed cameras to capture so far inaccessible relevant times scales

Directing the flow response by tuning particle characteristic

We will study the effect of polydispersity, flexibility, chirality and frozen in kinks on bulk flow behaviour in different LC phases, comparing results between industrial and model systems.

Supervisory board of the network

Completion of supervisory board of the network

Production of thermo-responsive virus-based systems with varying length and flexibility

We will focus on the development of the following model system Modification of rodlike virus particles such that the thickness can be tuned in situ To this end temperature responsive polymer shells will be grown onto the particles surface The thickness and crosslink density of the polymer layer offers control over the volume fraction and the hardness of the rod particlesThis deliverable will be a physical suspension of colloidal particles in a solvent

Production of thermo-responsive silica rods

Fluorescently labelled silica particles will be synthesised offering a complimentary nonchiral alternative system to the virus system facilitating the realspace study of selfassembly and phase behaviour also in the presence of other colloidal particles and solvents This deliverable will be a physical suspension of colloidal particles in a solvent

Project identity set and launch of DiStruc web portal

Project identity set in order to facilitate communication and create a visual identity to the project DiStruc logo brochure and a slide template will be createdThe nonconfidential general public area in the DiStruc web portal piloted by FOR will provide general background information which is not currently available in an accessible form to the general public This information will enable interested educators such as high school teachers to integrate recently acquired knowledge into the curriculum early Interested undergraduate students will find information complementing their classes The program therefore will impact on the general public and raise the interest in scientific research from theory to advanced materials thus taking an active role in advertising a career in research to young peopleA restricted domain will be constructed in the web portal to which only the consortium will have accessGiven the mix of PU and CO I have selected the more confidential dissemination level

Veröffentlichungen

The Connection between Biaxial Orientation and Shear Thinning for Quasi-Ideal Rods

Autoren: Christian Lang, Joachim Kohlbrecher, Lionel Porcar, Minne Lettinga
Veröffentlicht in: Polymers, Ausgabe 8/8, 2016, Seite(n) 291, ISSN 2073-4360
Herausgeber: MDPI AG
DOI: 10.3390/polym8080291

Self-organisation of semi-flexible rod-like particles

Autoren: Bart de Braaf, Mariana Oshima Menegon, Stefan Paquay, Paul van der Schoot
Veröffentlicht in: The Journal of Chemical Physics, Ausgabe 147/24, 2017, Seite(n) 244901, ISSN 0021-9606
Herausgeber: American Institute of Physics
DOI: 10.1063/1.5000228

Hierarchical bounding structures for efficient virial computations: Towards a realistic molecular description of cholesterics

Autoren: Maxime M. C. Tortora, Jonathan P. K. Doye
Veröffentlicht in: The Journal of Chemical Physics, Ausgabe 147/22, 2017, Seite(n) 224504, ISSN 0021-9606
Herausgeber: American Institute of Physics
DOI: 10.1063/1.5002666

Continuum percolation of polydisperse rods in quadrupole fields: Theory and simulations

Autoren: Shari P. Finner, Mihail I. Kotsev, Mark A. Miller, Paul van der Schoot
Veröffentlicht in: The Journal of Chemical Physics, Ausgabe 148/3, 2018, Seite(n) 034903, ISSN 0021-9606
Herausgeber: American Institute of Physics
DOI: 10.1063/1.5010979

Elementary Edge and Screw Dislocations Visualized at the Lattice Periodicity Level in the Smectic Phase of Colloidal Rods

Autoren: Andrii Repula, Eric Grelet
Veröffentlicht in: Physical Review Letters, Ausgabe 121/9, 2018, ISSN 0031-9007
Herausgeber: American Physical Society
DOI: 10.1103/PhysRevLett.121.097801

Incorporating particle flexibility in a density functional description of nematics and cholesterics

Autoren: Maxime M. C. Tortora, Jonathan P. K. Doye
Veröffentlicht in: Molecular Physics, Ausgabe 116/21-22, 2018, Seite(n) 2773-2791, ISSN 0026-8976
Herausgeber: Taylor & Francis
DOI: 10.1080/00268976.2018.1464226

Two-dimensional, blue phase tactoids

Autoren: Luuk Metselaar, Amin Doostmohammadi, Julia M. Yeomans
Veröffentlicht in: Molecular Physics, Ausgabe 116/21-22, 2018, Seite(n) 2856-2863, ISSN 0026-8976
Herausgeber: Taylor & Francis
DOI: 10.1080/00268976.2018.1496292

Colloidal liquid crystals in square confinement: isotropic, nematic and smectic phases

Autoren: Louis B G Cortes, Yongxiang Gao, Roel P A Dullens, Dirk G A L Aarts
Veröffentlicht in: Journal of Physics: Condensed Matter, Ausgabe 29/6, 2017, Seite(n) 064003, ISSN 0953-8984
Herausgeber: Institute of Physics Publishing
DOI: 10.1088/1361-648X/29/6/064003

A quest for shear banding in ideal and non ideal colloidal rods

Autoren: C Lang, L Porcar, H Kriegs, M P Lettinga
Veröffentlicht in: Journal of Physics D: Applied Physics, Ausgabe 52/7, 2019, Seite(n) 074003, ISSN 0022-3727
Herausgeber: Institute of Physics Publishing
DOI: 10.1088/1361-6463/aaf40c

Effects of particle stiffness on the extensional rheology of model rod-like nanoparticle suspensions

Autoren: Christian Lang, Jan Hendricks, Zhenkun Zhang, Naveen K. Reddy, Jonathan P. Rothstein, M. Paul Lettinga, Jan Vermant, Christian Clasen
Veröffentlicht in: Soft Matter, Ausgabe 15/5, 2019, Seite(n) 833-841, ISSN 1744-683X
Herausgeber: Royal Society of Chemistry
DOI: 10.1039/c8sm01925h

Tumbling of Quantum Dots: Rheo-Optics

Autoren: Run Li, Marisol Ripoll, Naveen Reddy, Jan K.G. Dhont, Ruben Dierick, Zeger Hens, Christian Clasen
Veröffentlicht in: Langmuir, Ausgabe 34/48, 2018, Seite(n) 14633-14642, ISSN 0743-7463
Herausgeber: American Chemical Society
DOI: 10.1021/acs.langmuir.8b02498

Rod-Like Virus-Based Multiarm Colloidal Molecules

Autoren: Alexis de la Cotte, Cheng Wu, Marie Trévisan, Andrii Repula, Eric Grelet
Veröffentlicht in: ACS Nano, Ausgabe 11/10, 2017, Seite(n) 10616-10622, ISSN 1936-0851
Herausgeber: American Chemical Society
DOI: 10.1021/acsnano.7b06405

Perturbative density functional methods for cholesteric liquid crystals

Autoren: Maxime M. C. Tortora, Jonathan P. K. Doye
Veröffentlicht in: The Journal of Chemical Physics, Ausgabe 146/18, 2017, Seite(n) 184504, ISSN 0021-9606
Herausgeber: American Institute of Physics
DOI: 10.1063/1.4982934

Electric-field-induced shape transition of nematic tactoids

Autoren: Luuk Metselaar, Ivan Dozov, Krassimira Antonova, Emmanuel Belamie, Patrick Davidson, Julia M. Yeomans, Amin Doostmohammadi
Veröffentlicht in: Physical Review E, Ausgabe 96/2, 2017, Seite(n) 022706, ISSN 2470-0045
Herausgeber: American Physical Society
DOI: 10.1103/PhysRevE.96.022706

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