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

Solution Concentration and Dilution02:59

Solution Concentration and Dilution

133.3K
The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
133.3K
Expressing Solution Concentration02:48

Expressing Solution Concentration

67.7K
A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
Concentrations may be quantitatively assessed using a wide variety of measurement units, each convenient for particular applications. Molarity (M) is a useful concentration unit for many applications in chemistry.
67.7K
Viscosity01:17

Viscosity

7.3K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
7.3K
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

33.2K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
33.2K
Radius of Gyration of an Area01:12

Radius of Gyration of an Area

2.7K
The second moment of area, also known as the moment of inertia of area, is a crucial factor in understanding an object's resistance against bending deformation, or stiffness. To accurately estimate the second moment of area along any axis, one needs to concentrate all areas associated with that object into a thin strip, which should be placed parallel to that particular axis.
2.7K
Polymers02:34

Polymers

40.8K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.8K

You might also read

Related Articles

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

Sort by
Same author

Controlled Formation of Star Polymer Nanoparticles via Visible Light Photopolymerization.

ACS macro letters·2022
Same author

A generic class of amyloid fibril inhibitors.

Journal of materials chemistry. B·2020
Same author

Shear Induced Interactions Cause Polymer Compression.

Scientific reports·2020
Same author

Combined Fenton and starvation therapies using hemoglobin and glucose oxidase.

Nanoscale·2019
Same author

Targeted Graphene Oxide Networks: Cytotoxicity and Synergy with Anticancer Agents.

ACS applied materials & interfaces·2018
Same author

Cancer Treatment through Nanoparticle-Facilitated Fenton Reaction.

ACS nano·2018

Related Experiment Video

Updated: Jan 30, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.9K

The viscosity-radius relationship for concentrated polymer solutions.

Dave E Dunstan1

  • 1Department of Chemical Engineering, University of Melbourne, VIC, 3010, Australia. davided@unimelb.edu.au.

Scientific Reports
|January 26, 2019
PubMed
Summary
This summary is machine-generated.

Polymer chains unexpectedly compress in flow, challenging physics assumptions. This study reveals viscosity decreases as polymer radius shrinks, explaining shear thinning and temperature effects in polymer solutions.

More Related Videos

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

11.0K
Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

14.3K

Related Experiment Videos

Last Updated: Jan 30, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.9K
Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

11.0K
Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

14.3K

Area of Science:

  • Polymer Physics
  • Rheology
  • Physical Chemistry

Background:

  • A fundamental assumption in polymer physics is that polymer chains extend in fluid flow.
  • Recent experiments contradict this, showing polymer chains compress under Couette flow.

Purpose of the Study:

  • To investigate the relationship between polymer viscosity (η) and chain radius of gyration (RG).
  • To reconcile experimental observations with theoretical models of polymer behavior in solution.

Main Methods:

  • Utilized scaling arguments and literature-based experimental data.
  • Analyzed the viscosity-radius of gyration relationship under varying shear rates and temperatures.

Main Results:

  • Established a power-law relationship: η ∝ RGm, where m depends on polymer-solvent system and shear rate.
  • Demonstrated that viscosity decreases with decreasing radius for ideal random walks in concentrated solutions.
  • Showed this relationship aligns with observed viscosity-temperature and viscosity-shear rate behaviors.

Conclusions:

  • The assumption of polymer chain extension in flow is inconsistent with experimental data.
  • Shear thinning arises from a decrease in polymer radius with increasing shear rate.
  • Thermal expansion coefficients influence the power-law exponents observed in different polymer systems.