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

Fluctuations in diffusion processes in microgravity.

Stefano Mazzoni1, Roberto Cerbino, Alberto Vailati

  • 1CNR-Istituto Nazionale per la Fisica della Matenia and Dipartimento di Fisica, via Celoria 16, 20133 Milan, Italy. stefano.mazzoni@gmail.com

Annals of the New York Academy of Sciences
|November 25, 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

Probing early-stage casein micelle aggregation during milk acidification with differential dynamic microscopy.

Journal of colloid and interface science·2026
Same author

Restoring the tumour mechanophenotype of vocal fold cancer reverts its malignant properties.

Nature materials·2026
Same author

De Novo Gene Transcription of Connexin Mediates Cytoplasmic Fluid Exchange and Flocking Transitions in Physiological and Cancerous Epithelial Systems.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2025
Same author

<i>Myxococcus xanthus</i> for active matter studies: a tutorial for its growth and potential applications.

Soft matter·2025
Same author

The Hitchhiker's guide to differential dynamic microscopy.

The Journal of chemical physics·2025
Same author

Quenching of long-wavelength non-equilibrium temperature fluctuations in a thermophilic colloidal suspension heated from below.

The Journal of chemical physics·2025

Giant nonequilibrium fluctuations (NEFs) in diffusion processes are amplified in microgravity. The GRADFLEX experiment investigates these enhanced fluctuations, crucial for processes like protein crystallization.

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Diffusion processes exhibit giant nonequilibrium fluctuations (NEFs) with amplitudes inversely proportional to the wave vector.
  • Gravity normally quenches NEFs with wave numbers below a critical value.
  • Microgravity conditions are expected to enhance NEFs due to the absence of buoyancy-driven restoring forces.

Purpose of the Study:

  • To investigate the presence and characteristics of NEFs in diffusion processes under microgravity conditions.
  • To assess the impact of microgravity on NEFs, particularly in concentration diffusion and temperature gradients.
  • To understand how enhanced NEFs might affect diffusion-dependent processes like protein crystallization in space.

Main Methods:

  • The GRADFLEX (GRAdient-Driven FLuctuation EXperiment) project utilizes two experiments, one focusing on concentration diffusion (UNIMI/INFM) and the other on temperature fluctuations (UCSB).

Related Experiment Videos

  • NEFs in a binary mixture are induced via the Soret effect in the UNIMI-INFM experiment.
  • An all-optical quantitative shadowgraph technique is employed for diagnostics, with image processing used to obtain the power spectrum of NEFs.

    • Main Results:

    • Ground-based experiments for the UNIMI-INFM component of GRADFLEX have been conducted.
    • Detailed descriptions of the experimental apparatus and preliminary results are presented.
    • The GRADFLEX payload is slated for a FOTON M3 mission in April 2007.

    Conclusions:

    • Microgravity is hypothesized to significantly boost NEFs by removing gravitational damping.
    • Understanding NEFs in microgravity is critical for optimizing space-based material processing and scientific research.
    • The GRADFLEX experiment aims to provide crucial data on NEFs in space, advancing fundamental physics and applied science.