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

Assembling and manipulating two-dimensional colloidal crystals with movable nanomagnets.

L E Helseth1, H Z Wen, R W Hansen

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 11, 2004
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

Influence of Surface-Active Molecules in Solution on Charge Transfer Due to a Water-Air Contact Line Moving over a Hydrophobic Surface.

Langmuir : the ACS journal of surfaces and colloids·2025
Same author

Wetting of porous thin films exhibiting large contact angles.

The Journal of chemical physics·2023
Same author

Ion Concentration Influences the Charge Transfer Due to a Water-Air Contact Line Moving over a Hydrophobic Surface: Charge Measurements and Theoretical Models.

Langmuir : the ACS journal of surfaces and colloids·2023
Same author

Influence of Salt Concentration on Charge Transfer When a Water Front Moves across a Junction between a Hydrophobic Dielectric and a Metal Electrode.

Langmuir : the ACS journal of surfaces and colloids·2020
Same author

Scaling Behavior of Quasi-One-Dimensional Vortex Avalanches in Superconducting Films.

Scientific reports·2020
Same author

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification.

Langmuir : the ACS journal of surfaces and colloids·2019
Same journal

Controlled Secondary Growth of CAU-1-NH<sub>2</sub> Membranes with Improved CO<sub>2</sub> Separation Performance.

Langmuir : the ACS journal of surfaces and colloids·2026
Same journal

Facile Fabrication and Stable Mechanism of a Microscale Heavy Calcium Carbonate Suspension.

Langmuir : the ACS journal of surfaces and colloids·2026
Same journal

Polycationic Biocidal Coatings: The Mechanism of Their Interaction with Cells.

Langmuir : the ACS journal of surfaces and colloids·2026
Same journal

Atomic-Scale Displacement in Ordered SmMnO<sub>3</sub> Nanoislands.

Langmuir : the ACS journal of surfaces and colloids·2026
Same journal

Vacancy Defect Modulated Interfacial Thermal Transport and Phonon Localization in AlGaN/GaN Heterojunctions.

Langmuir : the ACS journal of surfaces and colloids·2026
Same journal

Immobilization of Ytterbium via Polyphenol Chemistry on Implant Materials for Enhanced Cytocompatibility and Antibacterial Properties.

Langmuir : the ACS journal of surfaces and colloids·2026
See all related articles

Researchers explored paramagnetic bead crystallization under nanomagnet-generated magnetic fields. They observed crystal defects, melting dynamics, and self-healing cracks, revealing insights into colloidal crystal behavior under magnetic manipulation.

Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Paramagnetic bead crystallization is influenced by magnetic fields and fluid dynamics.
  • Nanomagnets create localized magnetic field gradients crucial for colloidal assembly.
  • Understanding defect formation and crystal dynamics is key to controlling self-assembled structures.

Purpose of the Study:

  • To investigate the crystallization of paramagnetic beads in magnetic field gradients produced by one-dimensional nanomagnets.
  • To analyze the pressure, flow thresholds, defect behavior, and melting dynamics of these colloidal crystals.
  • To explore the effects of nanomagnet movement and oscillation on crystal integrity and structure.

Main Methods:

  • Utilizing magnetic field gradients generated by one-dimensional nanomagnets to induce paramagnetic bead crystallization.

Related Experiment Videos

  • Estimating hydrodynamic flow thresholds for crystal disassembly near magnetic potential barriers.
  • Observing and characterizing crystal defects, melting processes, and crack formation using microscopy and order parameter analysis.
  • Applying external magnetic fields to move nanomagnets and induce oscillations to study crystal responses.

    • Main Results:

    • Identified flow thresholds for crystal disassembly and observed defect density increasing with distance from the nanomagnet.
    • Demonstrated that the bond-oriental order parameter decreases over time during crystal melting after nanomagnet removal.
    • Observed self-healing crack formation with lattice roughening and gap formation at high nanomagnet driving velocities.
    • Showed that colloidal crystals break up into dipolar chains when confined between oscillating nanomagnets above a critical frequency.

    Conclusions:

    • The study provides a comprehensive understanding of paramagnetic colloidal crystal behavior under controlled magnetic fields.
    • Nanomagnet properties significantly influence crystal stability, defect dynamics, and responses to external stimuli.
    • Findings offer insights into the design and manipulation of colloidal self-assembly for potential applications in microfluidics and materials engineering.