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 Concept Videos

Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

Overview of VSEPR Theory
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

You might also read

Related Articles

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

Sort by
Same author

Tailoring Impact Toughness of PA6: Isolated Effects of Modifier Octene Content and Molecular Weight in MAH-Grafted EOR Copolymers.

Polymers·2026
Same author

Interplay Between Octene Content and Grafting-Induced Molecular Weight Deviations and Their Effect on the Impact Toughness of Ethylene/1-Octene-Modified Polyamide 6.

Polymers·2026
Same author

Dynamics of Polymer Rings in Ring-Linear Blends by Neutron Spin Echo Spectroscopy.

ACS macro letters·2025
Same author

15 years of spin-echo spectroscopy at SNS-NSE: Looking back and looking forward.

iScience·2025
Same author

Replacing PEG-Lipid with Amphiphilic Polycarbonates in mRNA-Loaded Lipid Nanoparticles: Impact of Polycarbonate Structure on Physicochemical and Transfection Properties.

Biomacromolecules·2025
Same author

Photopolymer Resins from Sulfenyl Chloride Commodity Chemicals for Plastic Optics, Photopatterning and 3D-Printing.

Advanced materials (Deerfield Beach, Fla.)·2025

Related Experiment Video

Updated: Jul 12, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Starlike dendrimers in solutions: structural properties and internal dynamics.

Silke Rathgeber1, Michael Monkenbusch, James L Hedrick

  • 1Max-Planck Institut für Polymerforschung, Polymer Physik, D-55128 Mainz, Germany. s.rathgeber@mpip-mainz.mpg.de

The Journal of Chemical Physics
|December 6, 2006
PubMed
Summary

Starlike dendrimers exhibit collective breathing motions, not shape fluctuations, under good solvent conditions. Neutron scattering reveals unique dynamics related to their fractal structure and relaxation rates.

More Related Videos

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
11:27

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging

Published on: December 4, 2016

Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures
08:02

Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures

Published on: May 31, 2024

Related Experiment Videos

Last Updated: Jul 12, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
11:27

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging

Published on: December 4, 2016

Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures
08:02

Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures

Published on: May 31, 2024

Area of Science:

  • Polymer Physics
  • Soft Matter Science
  • Materials Chemistry

Background:

  • Dendrimers are highly branched macromolecules with unique architectures.
  • Understanding their conformational dynamics is crucial for designing novel materials.
  • Starlike dendrimers present a specific architectural challenge due to their symmetric branching.

Purpose of the Study:

  • To investigate the shape and internal dynamics of starlike dendrimers.
  • To correlate structural changes with molecular motion under varying architectural parameters.
  • To analyze relaxation dynamics using neutron scattering techniques.

Main Methods:

  • Small-angle neutron scattering (SANS) for structural characterization.
  • Neutron spin-echo (NSE) spectroscopy for probing internal dynamics.
  • Systematic variation of architectural parameters (spacer length, generation).

Main Results:

  • Structural analysis revealed changes in fractal dimension and radius of gyration.
  • Length scale-dependent relaxation rates were extracted from NSE spectra.
  • A distinct local minimum in normalized relaxation rates was observed at specific length scales.
  • Observed dynamics align with a generalized Rouse-Zimm model for starlike dendrimers.

Conclusions:

  • The local minimum in relaxation rates indicates collective breathing motions of dendrons.
  • Shape fluctuations were not detected, suggesting a stable overall conformation.
  • The study provides insights into the complex dynamics of branched polymers.