Surface effects in nucleation and growth of smectic-B crystals in thin samples

T. Börzsönyi, S. Akamatsu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present an experimental study of the surface effects (interactions with the container walls) during the nucleation and growth of smectic-5 (SmB) crystals from the nematic in free growth and directional solidification of a mesogenic molecule [C4H9-(C6H 10)2CN] called CCH4 in thin (of thickness in the 10-μm range) samples. We follow the dynamics of the system in real time with a polarizing microscope. The inner surfaces of the glass-plate samples are coated with polymeric films, either rubbed polyimid (PI) films or mono-oriented poly(tetrafluoroethylene) (PTFE) films deposited by friction at high temperature. The orientation of the nematic and the smectic-B is planar. In PI-coated samples, the orientation effect of SmB crystals is mediated by the nematic, whereas, in PTFE-coated samples, it results from a homoepitaxy phenomenon occurring for two degenerate orientations. A recrystallization phenomenon partly destroys the initial distribution of crystal orientations. In directional solidification of polycrystals in PTFE-coated samples, a particular dynamics of faceted grain boundary grooves is at the origin of a dynamical mechanism of grain selection. Surface effects also are responsible for the nucleation of misoriented terraces on facets and the generation of lattice defects in the solid.

Original languageEnglish
Article number051709
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume66
Issue number5
DOIs
Publication statusPublished - Nov 2002

Fingerprint

Surface Effects
Nucleation
Crystal
nucleation
polytetrafluoroethylene
crystals
Solidification
Recrystallization
Polycrystal
polymeric films
Grain Boundary
polycrystals
Container
containers
Facet
grooves
Microscope
solidification
flat surfaces
Experimental Study

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Surface effects in nucleation and growth of smectic-B crystals in thin samples. / Börzsönyi, T.; Akamatsu, S.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 66, No. 5, 051709, 11.2002.

Research output: Contribution to journalArticle

@article{b364f01874a445a3902f8ff1345eeb60,
title = "Surface effects in nucleation and growth of smectic-B crystals in thin samples",
abstract = "We present an experimental study of the surface effects (interactions with the container walls) during the nucleation and growth of smectic-5 (SmB) crystals from the nematic in free growth and directional solidification of a mesogenic molecule [C4H9-(C6H 10)2CN] called CCH4 in thin (of thickness in the 10-μm range) samples. We follow the dynamics of the system in real time with a polarizing microscope. The inner surfaces of the glass-plate samples are coated with polymeric films, either rubbed polyimid (PI) films or mono-oriented poly(tetrafluoroethylene) (PTFE) films deposited by friction at high temperature. The orientation of the nematic and the smectic-B is planar. In PI-coated samples, the orientation effect of SmB crystals is mediated by the nematic, whereas, in PTFE-coated samples, it results from a homoepitaxy phenomenon occurring for two degenerate orientations. A recrystallization phenomenon partly destroys the initial distribution of crystal orientations. In directional solidification of polycrystals in PTFE-coated samples, a particular dynamics of faceted grain boundary grooves is at the origin of a dynamical mechanism of grain selection. Surface effects also are responsible for the nucleation of misoriented terraces on facets and the generation of lattice defects in the solid.",
author = "T. B{\"o}rzs{\"o}nyi and S. Akamatsu",
year = "2002",
month = "11",
doi = "10.1103/PhysRevE.66.051709",
language = "English",
volume = "66",
journal = "Physical review. E",
issn = "2470-0045",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Surface effects in nucleation and growth of smectic-B crystals in thin samples

AU - Börzsönyi, T.

AU - Akamatsu, S.

PY - 2002/11

Y1 - 2002/11

N2 - We present an experimental study of the surface effects (interactions with the container walls) during the nucleation and growth of smectic-5 (SmB) crystals from the nematic in free growth and directional solidification of a mesogenic molecule [C4H9-(C6H 10)2CN] called CCH4 in thin (of thickness in the 10-μm range) samples. We follow the dynamics of the system in real time with a polarizing microscope. The inner surfaces of the glass-plate samples are coated with polymeric films, either rubbed polyimid (PI) films or mono-oriented poly(tetrafluoroethylene) (PTFE) films deposited by friction at high temperature. The orientation of the nematic and the smectic-B is planar. In PI-coated samples, the orientation effect of SmB crystals is mediated by the nematic, whereas, in PTFE-coated samples, it results from a homoepitaxy phenomenon occurring for two degenerate orientations. A recrystallization phenomenon partly destroys the initial distribution of crystal orientations. In directional solidification of polycrystals in PTFE-coated samples, a particular dynamics of faceted grain boundary grooves is at the origin of a dynamical mechanism of grain selection. Surface effects also are responsible for the nucleation of misoriented terraces on facets and the generation of lattice defects in the solid.

AB - We present an experimental study of the surface effects (interactions with the container walls) during the nucleation and growth of smectic-5 (SmB) crystals from the nematic in free growth and directional solidification of a mesogenic molecule [C4H9-(C6H 10)2CN] called CCH4 in thin (of thickness in the 10-μm range) samples. We follow the dynamics of the system in real time with a polarizing microscope. The inner surfaces of the glass-plate samples are coated with polymeric films, either rubbed polyimid (PI) films or mono-oriented poly(tetrafluoroethylene) (PTFE) films deposited by friction at high temperature. The orientation of the nematic and the smectic-B is planar. In PI-coated samples, the orientation effect of SmB crystals is mediated by the nematic, whereas, in PTFE-coated samples, it results from a homoepitaxy phenomenon occurring for two degenerate orientations. A recrystallization phenomenon partly destroys the initial distribution of crystal orientations. In directional solidification of polycrystals in PTFE-coated samples, a particular dynamics of faceted grain boundary grooves is at the origin of a dynamical mechanism of grain selection. Surface effects also are responsible for the nucleation of misoriented terraces on facets and the generation of lattice defects in the solid.

UR - http://www.scopus.com/inward/record.url?scp=37649032724&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37649032724&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.66.051709

DO - 10.1103/PhysRevE.66.051709

M3 - Article

C2 - 12513505

AN - SCOPUS:37649032724

VL - 66

JO - Physical review. E

JF - Physical review. E

SN - 2470-0045

IS - 5

M1 - 051709

ER -