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

Rotational diffusivity of fractal clusters.

Marco Lattuada1, Hua Wu, Massimo Morbidelli

  • 1Institut für Chemie- und Bioingenieurwissenschaften, Swiss Federal Institute of Technology Zurich, ETHZ, ETH-Hönggerberg/HCI, CH-8093 Zürich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 1, 2005
PubMed
Summary

Fractal clusters exhibit anisotropic rotational diffusion, with one diffusivity significantly higher than others. Their rotational hydrodynamic radius is larger than the translational one, challenging common assumptions in colloidal aggregation studies.

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

Hypoxia promotes maintenance of the chondrogenic phenotype in rat growth plate chondrocytes through the HIF-1α/YAP signaling pathway.

International journal of molecular medicine·2018
Same author

Advantages of short repetition time resting-state functional MRI enabled by simultaneous multi-slice imaging.

Journal of neuroscience methods·2018
Same author

Local-scale determinants of arboreal spider beta diversity in a temperate forest: roles of tree architecture, spatial distance, and dispersal capacity.

PeerJ·2018
Same author

Uncommon Imaging Findings of Inflammatory Myofibroblastic Tumor: Report of a Rare Case With Both Omentum and Mesentery Involvement in the Abdominal Cavity.

Clinical nuclear medicine·2018
Same author

Time trends of incidence and mortality in colorectal cancer in Changning District, Shanghai, 1975-2013.

Journal of digestive diseases·2018
Same author

Galactose-Functionalized Double-Hydrophilic Block Glycopolymers and Their Thermoresponsive Self-Assembly Dynamics.

Langmuir : the ACS journal of surfaces and colloids·2018

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Fractal clusters are common in aggregation processes.
  • Understanding their rotational diffusion is crucial for interpreting experimental data.
  • Previous studies often assume rotational and translational hydrodynamic radii are equal.

Purpose of the Study:

  • Investigate the rotational diffusion of fractal clusters formed via aggregation.
  • Calculate the rotational diffusion tensor and its eigenvalues.
  • Determine the rotational hydrodynamic radius and compare it to the translational hydrodynamic radius.

Main Methods:

  • Off-lattice cluster-cluster aggregation algorithm (diffusion-limited and reaction-limited).
  • Extended Kirkwood-Riseman theory for rotational diffusion tensor estimation.

Related Experiment Videos

  • Computation and averaging of eigenvalues for rotational diffusivity.

    • Main Results:

    • Fractal clusters display significant anisotropy in rotational diffusion.
    • One principal rotational diffusivity is substantially larger than the other two.
    • The rotational hydrodynamic radius (Rh,r) is approximately 25% larger than the translational hydrodynamic radius (Rh).

    Conclusions:

    • The assumption Rh = Rh,r is unreliable for aggregating colloidal systems.
    • Anisotropic rotational diffusion must be considered for accurate modeling.
    • The calculated Rh,r provides a more accurate parameter for interpreting dynamic light scattering data.