Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Forbidden walls.

M Simões1, A J Palangana

  • 1Departamento de Fisica, Universidade Estadual de Londrina, Campus Universitario, 86051-970, Londrina (PR), Brazil.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Impact of a One-Week Bioengineering Outreach Activity on the Academic Perceptions and Motivation of High School Students.

Biochemistry and molecular biology education : a bimonthly publication of the International Union of Biochemistry and Molecular Biology·2026
Same author

Comparative Analysis of Data Augmentation Approaches for Blood Pressure Prediction.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2025
Same author

Predictive Modeling of Blood Pressure Progression.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2025
Same author

Living in the vicinity of pesticide-treated crop fields: Exploring associated perceptions and psychological aspects in relation to self-reported and registry-based health symptoms.

BMC psychology·2024
Same author

Far-UV-C irradiation promotes synergistic bactericidal action against adhered cells of Escherichia coli and Staphylococcus epidermidis.

The Science of the total environment·2024
Same author

The impact of potassium peroxymonosulphate and chlorinated cyanurates on biofilms of <i>Stenotrophomonas maltophilia</i>: effects on biofilm control, regrowth, and mechanical properties.

Biofouling·2023
Same journal

Efficient Monte Carlo simulations using a shuffled nested Weyl sequence random number generator.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
Same journal

Spatiotemporal dynamics of electromagnetic pulses in saturating nonlinear optical media with normal group velocity dispersion.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
Same journal

Soliton-breather reaction pathways.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
Same journal

Calculation of electromagnetic properties of regular and random arrays of metallic and dielectric cylinders.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
Same journal

Electromagnetic convective cells in a nonuniform dusty plasma.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
Same journal

Stability of neural networks and solitons of field theory.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2002
See all related articles

Periodic twist-bend walls were observed near the Frèedericksz critical point, challenging existing theories. Their formation is attributed to amplified random fluctuations rather than material motion.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Liquid Crystal Physics

Background:

  • The Fréedericksz transition describes the magnetic field-induced reorientation of calamitic nematic liquid crystals.
  • Existing theories do not predict the formation of twist-bend walls in the magnetic field region near the Fréedericksz critical point.

Purpose of the Study:

  • To report and investigate the unexpected presence of periodic twist-bend walls.
  • To understand the formation mechanism of these structures in a specific magnetic field regime.

Main Methods:

  • Experimental observation of twist-bend walls in a nematic calamitic sample.
  • Measurement of the periodicity length and formation time of the observed walls.
  • Analysis of nematic material motion to rule out coherent motion as the formation driver.

Related Experiment Videos

Main Results:

  • Periodic twist-bend walls were observed in the upper vicinity of the Fréedericksz critical point.
  • The measured periodicity and formation time indicate that coherent nematic motion does not cause these structures.
  • The formation mechanism is hypothesized to involve the magnification of random fluctuations near the critical point.

Conclusions:

  • The presence of twist-bend walls challenges current understanding of nematic liquid crystal behavior near critical points.
  • Random fluctuations, amplified near the Fréedericksz critical point, are proposed as the likely mechanism for wall formation.
  • Further research is needed to fully elucidate the role of fluctuations in liquid crystal phase transitions.