Sheared colloidal crystals in confined geometry: a real space study on stationary structures under shear

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Thomas Palberg
  • R Biehl
Sammlungen
  • metadata
ISSN
1359-6640
Zeitschrift
Faraday discussions
Schlüsselwörter
  • 530 Physik
  • 530 Physics
Sprache
eng
Paginierung
Seiten: 133 - 143
Datum der Veröffentlichung
2003
Datum der Datenerfassung
2020
Datum, an dem der Datensatz öffentlich gemacht wurde
2020
Zugang
Public
Titel
Sheared colloidal crystals in confined geometry : a real space study on stationary structures under shear
Ausgabe der Zeitschrift
123

Datenquelle: METADATA.UB

Andere Metadatenquellen:
Autoren
  • Thomas Palberg
  • Ralf Biehl
DOI
10.1039/b204821c
eISSN
1364-5498
ISSN
1359-6640
Zeitschrift
Faraday Discussions
Online publication date
2002
Paginierung
133 - 143
Datum der Veröffentlichung
2003
Status
Published
Herausgeber
Royal Society of Chemistry (RSC)
Herausgeber URL
http://dx.doi.org/10.1039/b204821c
Datum der Datenerfassung
2024
Titel
Sheared colloidal crystals in confined geometry: a real space study on stationary structures under shear
Ausgabe der Zeitschrift
123

Datenquelle: Crossref

Abstract
We constructed an optical plate-plate shear cell suitable for the study of aqueous suspensions of charged colloidal spheres under low electrolyte concentrations (10(-6) M). The variable gap height was adjusted to 30 microm corresponding to 15-30 interparticle distances. The concentration of 300 microm diameter polystyrene spheres was chosen around 1 microm(-1) where previous studies had revealed the equilibrium structure to be fluid or body centred cubic. Under shear, layer structures of hexagonal symmetry form, often coexistent with a fluid phase. We used an adapted high resolution video microscope to perform a detailed study of the structure. The central ray of light was prevented from entering the objective and the images are constructed from higher order scattered light. The cover glass correction was adjusted in such a way that several layers of particles were visible simultaneously. The effective depth of sharpness was thus increased to several microm. From the 2D video frames we constructed time averaged 2D particle correlation diagrams (PCD) which correspond to the distribution functions for the projections of particle positions into the x y-plane. They allow us to discriminate different layers and to analyse their structure and their relative position. Layer structures showed approximately hexagonal symmetry bat with an elongation in the flow direction. They were always observed to be wall based. Melting in the z-direction occurred before in-plane melting and with a different mechanism. The resulting salt concentration-shear rate phase diagram is discussed in comparison with results from computer simulation.
Addresses
  • University of Mainz, Institute of Physics, Staudinger Weg 7, D-5509, Mainz, Germany. Thomas.Palberg@Uni-Mainz.de
Autoren
  • Thomas Palberg
  • Ralf Biehi
DOI
10.1039/b204821c
eISSN
1364-5498
Externe Identifier
  • PubMed Identifier: 12638859
Open access
false
ISSN
1359-6640
Zeitschrift
Faraday discussions
Sprache
eng
Medium
Print
Paginierung
133 - 421
Datum der Veröffentlichung
2003
Status
Published
Datum der Datenerfassung
2003
Titel
Sheared colloidal crystals in confined geometry: a real space study on stationary structures under shear.
Sub types
  • Journal Article
Ausgabe der Zeitschrift
123

Datenquelle: Europe PubMed Central

Abstract
We constructed an optical plate-plate shear cell suitable for the study of aqueous suspensions of charged colloidal spheres under low electrolyte concentrations (10(-6) M). The variable gap height was adjusted to 30 microm corresponding to 15-30 interparticle distances. The concentration of 300 microm diameter polystyrene spheres was chosen around 1 microm(-1) where previous studies had revealed the equilibrium structure to be fluid or body centred cubic. Under shear, layer structures of hexagonal symmetry form, often coexistent with a fluid phase. We used an adapted high resolution video microscope to perform a detailed study of the structure. The central ray of light was prevented from entering the objective and the images are constructed from higher order scattered light. The cover glass correction was adjusted in such a way that several layers of particles were visible simultaneously. The effective depth of sharpness was thus increased to several microm. From the 2D video frames we constructed time averaged 2D particle correlation diagrams (PCD) which correspond to the distribution functions for the projections of particle positions into the x y-plane. They allow us to discriminate different layers and to analyse their structure and their relative position. Layer structures showed approximately hexagonal symmetry bat with an elongation in the flow direction. They were always observed to be wall based. Melting in the z-direction occurred before in-plane melting and with a different mechanism. The resulting salt concentration-shear rate phase diagram is discussed in comparison with results from computer simulation.
Autoren
  • Thomas Palberg
  • Ralf Biehi
Autoren-URL
https://www.ncbi.nlm.nih.gov/pubmed/12638859
DOI
10.1039/b204821c
ISSN
1359-6640
Zeitschrift
Faraday Discuss
Sprache
eng
Country
England
Paginierung
133 - 143
Datum der Veröffentlichung
2003
Status
Published
Datum, an dem der Datensatz öffentlich gemacht wurde
2003
Titel
Sheared colloidal crystals in confined geometry: a real space study on stationary structures under shear.
Sub types
  • Journal Article
Ausgabe der Zeitschrift
123

Datenquelle: PubMed

Autoren
  • Thomas Palberg
  • Ralf Biehl
DOI
10.1039/b204821c
ISSN
1359-6640
Zeitschrift
Faraday Discussions
Paginierung
133 - 143
Datum der Veröffentlichung
2003
Datum der Datenerfassung
2020
Titel
Sheared colloidal crystals in confined geometry: a real space study on stationary structures under shear
Sub types
  • article
Ausgabe der Zeitschrift
123

Datenquelle: Manual

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