Related Experiment Video
Updated: Jul 17, 2026
13:15
Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
Published on: July 18, 2014
Correction of random surface roughness on colloidal probes in measuring adhesion
Seungho Yang1, Huan Zhang, Stephen M Hsu
1Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 24, 2007
Summary
Adhesion forces measured using colloidal probes did not correlate with sphere radii. A new multiscale model improved roughness correction for nanoscale adhesion, though sharp features remained a challenge.
Area of Science:
- Nanotechnology
- Materials Science
- Surface Science
Background:
- Atomic force microscopy (AFM) is crucial for nanoscale adhesion measurements.
- Colloidal probes minimize contact area uncertainties in AFM adhesion studies.
- Existing models struggle to accurately account for surface roughness effects on adhesion.
Purpose of the Study:
- To investigate nanoscale adhesion between glass spheres and silicon (100) surfaces.
- To evaluate the influence of colloidal probe radii and surface roughness on adhesion forces.
- To develop an improved contact model for nanoscale adhesion under controlled environmental conditions.
Main Methods:
- Adhesion forces were measured using colloidal probes with varying sphere radii on a silicon (100) surface.
- Experiments were conducted under controlled low relative humidity (<3%) and temperature (25°C).
- Existing roughness correction models (Rumpf, Rabinovich) were evaluated alongside a new multiscale contact model.
Main Results:
- Adhesion forces showed no correlation with colloidal probe radii, contradicting elastic contact mechanics predictions.
- Surface roughness and irregular features on colloidal probes significantly impacted adhesion measurements.
- The new multiscale contact model successfully corrected for most roughness effects, except for sharp angular features.
Conclusions:
- Standard elastic contact theories are insufficient for predicting nanoscale adhesion with rough surfaces.
- Surface topography, particularly roughness, is a critical factor influencing nanoscale adhesion.
- The developed multiscale contact model offers improved accuracy for nanoscale adhesion predictions, highlighting the need to address sharp asperities.
