Related Experiment Video
Updated: May 10, 2026
07:37
TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
Published on: April 26, 2017
Dynamic contact angle of water-based titanium oxide nanofluid
Milad Radiom1, Chun Yang, Weng Kong Chan
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. mcyang@ntu.edu.sg.
Nanoscale Research Letters
|June 14, 2013
Summary
This study explores how titanium dioxide (TiO2) nanofluids spread and their dynamic contact angle. Energy dissipation from contact line friction and wedge film viscosity are key factors influencing spreading dynamics.
Area of Science:
- Materials Science
- Fluid Dynamics
- Surface Chemistry
Background:
- Understanding nanofluid spreading is crucial for applications like coatings and microfluidics.
- The dynamic contact angle and spreading behavior are influenced by complex fluid properties and surface interactions.
Purpose of the Study:
- To investigate the spreading dynamics of titanium dioxide (TiO2)-deionized water nanofluids.
- To analyze the role of energy dissipation mechanisms in governing the motion of the contact line.
- To develop and validate a theoretical model for nanofluid spreading.
Main Methods:
- Experimental investigation of TiO2-deionized water nanofluid spreading.
- Theoretical modeling combining molecular kinetic and hydrodynamic theories.
- Incorporation of non-Newtonian viscosity into the theoretical framework.
Main Results:
- Identified two primary energy dissipation mechanisms: contact line friction (dominant in the primary stage) and wedge film viscosity (dominant in the secondary stage).
- A theoretical model was developed, showing reasonable agreement with experimental data.
- Discrepancies were attributed to interparticle interactions, contact line pinning, and interfacial tension variations.
Conclusions:
- Contact line friction and wedge film viscosity are critical for understanding nanofluid spreading dynamics.
- The developed theoretical model provides a valuable framework for predicting nanofluid behavior.
- Further research is needed to account for complex phenomena influencing spreading accuracy.
Related Concept Videos
01:13Contact Angle
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
01:22Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...