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

Thermal diffusion behavior of hard-sphere suspensions.

Hui Ning1, Johan Buitenhuis, Jan K G Dhont

  • 1Forschungszentrum Jülich GmbH, IFF-Weiche Materie, D-52428 Jülich, Germany. h.ning@fz-juelich.de

The Journal of Chemical Physics
|December 6, 2006
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

Modeling crossflow filtration: Effect of shear on particle-enriched polarization and cake layers.

The Journal of chemical physics·2026
Same author

Terahertz-induced conformational dynamics of synaptotagmin III.

Physical chemistry chemical physics : PCCP·2026
Same author

Reactive magnetron sputtered copper nitride with controlled N-coordination number for ionic polymer free CO<sub>2</sub> electroreduction.

Journal of colloid and interface science·2026
Same author

SlBTF3-OST1-CBF1 Module Maintains Chloroplast Integrity under Cold Stress in Tomato (<i>Solanum lycopersicum</i>).

Journal of agricultural and food chemistry·2026
Same author

Gut virome derived bacteriophage endolysin Lys572 can effectively control Streptococcus suis in refrigerated and thawed pork.

International journal of food microbiology·2026
Same author

Hydrophilicity controls thermodiffusion in alkylammonium chlorides.

The European physical journal. E, Soft matter·2026

Octadecyl coated silica particles exhibit unique thermal diffusion behavior. Their movement direction in toluene reverses with temperature and concentration changes, a novel observation in colloidal systems.

Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Thermophysical Properties

Background:

  • Understanding colloidal particle behavior is crucial in various applications.
  • Thermal diffusion, or thermophoresis, describes particle movement in response to temperature gradients.
  • Previous studies on colloidal thermophoresis have not extensively explored sign changes with both temperature and concentration.

Purpose of the Study:

  • To investigate the thermal diffusion behavior of octadecyl coated silica particles in toluene.
  • To determine how temperature and particle concentration affect the Soret coefficient.
  • To explore the transition from hard-sphere to sticky-sphere behavior in colloidal systems.

Main Methods:

  • Thermal diffusion forced Rayleigh scattering (TDsmallskipFRS) was employed to measure thermal diffusion.

Related Experiment Videos

  • Static and dynamic light scattering experiments were conducted to characterize particle interactions.
  • Measurements were performed across a temperature range of 15.0–50.0 °C and volume fractions of 1%–30%.

    • Main Results:

    • The Soret coefficient (S(T)) of silica particles changed sign from negative to positive with increasing temperature.
    • A sign change of the Soret coefficient from positive to negative was observed with increasing volume fraction.
    • Colloidal particles exhibited hard-sphere behavior at high temperatures and sticky-sphere behavior at low temperatures.

    Conclusions:

    • This study presents the first colloidal system demonstrating a sign change in the Soret coefficient with both temperature and volume fraction.
    • Colloid-colloid interactions significantly influence the concentration dependence of the thermal diffusion coefficient.
    • The temperature dependence is primarily governed by single colloidal particle properties and colloid-solvent interactions.