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Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings

Title data

Röhrl, Maximilian ; Mettke, Judith H. ; Rosenfeldt, Sabine ; Schmalz, Holger ; Mansfeld, Ulrich ; Timmins, Renee ; Habel, Christoph ; Breu, Josef ; Durst, Franz:
Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings.
In: Journal of Coatings Technology and Research. Vol. 19 (2022) Issue 2 . - pp. 487-495.
ISSN 1547-0091
DOI: https://doi.org/10.1007/s11998-021-00535-4

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
SFB 1357 Mikroplastik
391977956

Project financing: Bundesministerium für Bildung und Forschung
DFG

Abstract in another language

When suspensions are exposed to shear forces, the particles may form ordered structures depending on their shapes, concentrations, and the material. For some processes, e.g., for wet-film coating, it is important to know how fast these structures form in shear fields and for how long the structures persist when the shear is relaxed. To obtain information on the particle structure formation and the decay time, the effective viscosity of nematic suspensions of Na-hectorite nanosheets was investigated by rheology employing a cone-plate measurement geometry. The necessary time for the formation of textured nematic films could be deduced by carrying out effective viscosity measurements at constant time steps. Information could also be obtained on the lifetime of the platelet textures when shear is relaxed. All this information was employed to identify geometrical requirements for slot dies to produce barrier liners with nanosheet layers oriented parallel to PET substrates. Thereby, we obtained green and simple coatings in line with state-of-the-art high-performance materials such as metalized plastic foils in terms of oxygen barrier properties.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Rheology; Shear flow-induced alignment; Slot die coating; Barrier properties; Oxygen permeability
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 1357 - MIKROPLASTIK
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 26 Oct 2021 07:52
Last Modified: 13 Oct 2022 12:35
URI: https://eref.uni-bayreuth.de/id/eprint/67465