Optical experiments on a crystallizing hard-sphere-polymer mixture at coexistence

Autoren

Andreas Stipp
Hans-Joachim Schöpe
Thomas Palberg
Thomas Eckert
Ralf Biehl
Eckhard Bartsch

DOI

10.1103/physreve.81.051401

eISSN

1550-2376

ISSN

1539-3755

Ausgabe der Veröffentlichung

5

Zeitschrift

Physical Review E

Sprache

en

Artikelnummer

051401

Online publication date

2010

Status

Published online

Herausgeber

American Physical Society (APS)

Herausgeber URL

http://dx.doi.org/10.1103/physreve.81.051401

Datum der Datenerfassung

2019

Titel

Optical experiments on a crystallizing hard-sphere–polymer mixture at coexistence

Ausgabe der Zeitschrift

81

Data source: Crossref

Abstract

We report on the crystallization kinetics in an entropically attractive colloidal system using a combination of time resolved scattering methods and microscopy. Hard sphere particles are polystyrene microgels swollen in a good solvent (radius a=380 nm, starting volume fraction 0.534) with the short ranged attractions induced by the presence of short polymer chains (radius of gyration r g=3 nm, starting volume fraction 0.0224). After crystallization, stacking faulted face centered cubic crystals coexist with about 5% of melt remaining in the grain boundaries. From the Bragg scattering signal we infer the amount of crystalline material, the average crystallite size and the number density of crystals as a function of time. This allows to discriminate an early stage of conversion, followed by an extended coarsening stage. The small angle scattering (SALS) appears only long after completed conversion and exhibits Furukawa scaling for all times. Additional microscopic experiments reveal that the grain boundaries have a reduced Bragg scattering power but possess an increased refractive index. Fits of the Furukawa function indicate that the dimensionality of the scatterers decreases from 2.25 at short times to 1.65 at late times and the characteristic length scale is slightly larger than the average crystallite size. Together this suggests the SALS signal is due scattering from a foam like grain boundary network as a whole.

Addresses

Institut für Physik, Johannes Gutenberg Universität, Staudingerweg 7, D-55128 Mainz, Germany.

Autoren

Andreas Stipp
Hans-Joachim Schöpe
Thomas Palberg
Thomas Eckert
Ralf Biehl
Eckhard Bartsch

DOI

10.1103/physreve.81.051401

eISSN

1550-2376

Externe Identifier

PubMed Identifier: 20866224

Open access

false

ISSN

1539-3755

Ausgabe der Veröffentlichung

5 Pt 1

Zeitschrift

Physical review. E, Statistical, nonlinear, and soft matter physics

Schlüsselwörter

Polystyrenes
Polymers
Gels
Microscopy
Crystallization
Equipment Design
Biophysics
Osmosis
Kinetics
Algorithms
Pressure
Scattering, Radiation
Optics and Photonics

Sprache

eng

Medium

Print-Electronic

Online publication date

2010

Paginierung

051401

Datum der Veröffentlichung

2010

Status

Published

Datum der Datenerfassung

2010

Titel

Optical experiments on a crystallizing hard-sphere-polymer mixture at coexistence.

Sub types

Journal Article

Ausgabe der Zeitschrift

81

Data source: Europe PubMed Central

Abstract

We report on the crystallization kinetics in an entropically attractive colloidal system using a combination of time resolved scattering methods and microscopy. Hard sphere particles are polystyrene microgels swollen in a good solvent (radius a=380 nm, starting volume fraction 0.534) with the short ranged attractions induced by the presence of short polymer chains (radius of gyration r g=3 nm, starting volume fraction 0.0224). After crystallization, stacking faulted face centered cubic crystals coexist with about 5% of melt remaining in the grain boundaries. From the Bragg scattering signal we infer the amount of crystalline material, the average crystallite size and the number density of crystals as a function of time. This allows to discriminate an early stage of conversion, followed by an extended coarsening stage. The small angle scattering (SALS) appears only long after completed conversion and exhibits Furukawa scaling for all times. Additional microscopic experiments reveal that the grain boundaries have a reduced Bragg scattering power but possess an increased refractive index. Fits of the Furukawa function indicate that the dimensionality of the scatterers decreases from 2.25 at short times to 1.65 at late times and the characteristic length scale is slightly larger than the average crystallite size. Together this suggests the SALS signal is due scattering from a foam like grain boundary network as a whole.

Autoren

Andreas Stipp
Hans-Joachim Schöpe
Thomas Palberg
Thomas Eckert
Ralf Biehl
Eckhard Bartsch

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/20866224

DOI

10.1103/PhysRevE.81.051401

eISSN

1550-2376

Ausgabe der Veröffentlichung

5 Pt 1

Zeitschrift

Phys Rev E Stat Nonlin Soft Matter Phys

Schlüsselwörter

Algorithms
Biophysics
Crystallization
Equipment Design
Gels
Kinetics
Microscopy
Optics and Photonics
Osmosis
Polymers
Polystyrenes
Pressure
Scattering, Radiation

Sprache

eng

Country

United States

Paginierung

051401

Datum der Veröffentlichung

2010

Status

Published

Datum, an dem der Datensatz öffentlich gemacht wurde

2011

Titel

Optical experiments on a crystallizing hard-sphere-polymer mixture at coexistence.

Sub types

Journal Article

Ausgabe der Zeitschrift

81

Data source: PubMed

Abstract

We report on the crystallization kinetics in an entropically attractive colloidal system using a combination of time resolved scattering methods and microscopy. Hard sphere particles are polystyrene microgels swollen in a good solvent (radius a=380nm, starting volume fraction 0.534) with the short ranged attractions induced by the presence of short polymer chains (radius of gyration rg = 3nm, starting volume fraction 0.0224). After crystallization, stacking faulted face centred cubic crystals coexist with about 5% of melt remaining in the grain boundaries. From the Bragg scattering signal we infer the amount of crystalline material, the average crystallite size and the number density of crystals as a function of time. This allows to discriminate an early stage of conversion, followed by an extended coarsening stage. The small angle scattering (SALS) appears only long after completed conversion and exhibits Furukawa scaling for all times. Additional microscopic experiments reveal that the grain boundaries have a reduced Bragg scattering power but possess an increased refractive index. Fits of the Furukawa function indicate that the dimensionality of the scatterers decreases from 2.25 at short times to 1.65 at late times and the characteristic length scale is slightly larger than the average crystallite size. Together this suggests the SALS signal is due scattering from a foam like grain boundary network as a whole.

Autoren

Andreas Stipp
Hans-Joachim Schoepe
Thomas Palberg
Thomas Eckert
Eckhard Bartsch
Ralf Biehl

Autoren-URL

http://arxiv.org/abs/0910.2813v1

Zeitschrift

Physical Review E

Schlüsselwörter

cond-mat.soft
cond-mat.soft

Notes

33 pages, 11 figures

Paginierung

051401

Datum der Veröffentlichung

2009

Herausgeber URL

http://dx.doi.org/10.1103/PhysRevE.81.051401

Datum der Datenerfassung

2009

Datum, an dem der Datensatz öffentlich gemacht wurde

2009

Titel

Optical Experiments on a Crystallizing Hard Sphere - Polymer Mixture at Coexistence

Ausgabe der Zeitschrift

81

Files

0910.2813v1.pdf

Data source: arXiv

Optical experiments on a crystallizing hard-sphere-polymer mixture at coexistence

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