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Related Experiment Video

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Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization

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Published on: November 12, 2014

Catanionic surfactants as nanospring suspensions: a model.

Janaky Narayanan¹, P A Hassan, C Manohar

¹Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai-400076, India. janaky_n@iitb.ac.in

Langmuir : the ACS Journal of Surfaces and Colloids

|July 1, 2009

Summary

A new model explains nanospring behavior in suspensions, linking electrical forces to viscosity changes. This research demonstrates shear-thickening and suggests surfactant mixtures as potential applications.

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Area of Science:

Colloid and Surface Science
Rheology of Soft Matter

Background:

Understanding the rheological properties of nanospring suspensions is crucial for their application in advanced materials.
Electrical double layer forces significantly influence the behavior and configuration of charged nanoparticles.

Purpose of the Study:

To develop a theoretical model for dilute nanospring suspensions controlled by electrical double layer forces.
To investigate the dependence of suspension viscosity on surface charge and packing parameter.
To explore the phenomenon of shear-thickening in such systems.

Main Methods:

Development of a theoretical model for nanospring equilibrium configuration and extension.
Incorporation of a model for a changing packing parameter.
Calculation of viscosity as a function of surface charge.

Main Results:

The model demonstrates the dependence of viscosity on surface charge.
Shear-thickening behavior in nanospring suspensions is shown to be possible.
Specific rheological profiles (two viscosity peaks, a minimum) are linked to shear-thickening.

Conclusions:

The proposed model provides a framework for understanding the complex rheology of nanospring suspensions.
Mixtures of cationic and anionic surfactants exhibiting specific viscosity behaviors are identified as likely candidates for this model.
The findings contribute to the design and application of smart fluids and soft materials.