roughness – TechConnect Briefs

Predicting Contact Angles for Regular and Irregular Surfaces

Krishnan K., Loth E., University of Virginia, US

We attempted new models for advancing and receding contact angles for both regular and irregular surfaces. While many models have been suggested for regular surfaces, comparison with experimental data shows the presence of secondary effect. [...]

Effect of superhydrophobic nanocomposite surface roughness on anti-icing performance

Davis A., Yeong Y.H., Steele A., Loth E., Bayer I.S., University of Virginia, US

While past work has shown the ice-phobic potential of a superhydrophobic surface or noted the effect of surface area on ice adhesion to an array of microposts, questions still remain on the effect of a [...]

Printed sensor and liquid actuation on natural fiber based substrate

Saarinen J.J., Ihalainen P., Määttänen A., Bollström R., Peltonen J., Abo Akademi University, FI

Recently we have developed a new biobased substrate for printed functionality that, compared to the conventional plastic films, is recyclable and renewable based on natural fibers. Inkjet printed transistor functionality has already been realized and [...]

Comparison of Roughness Measurements Between a Contact Stylus Instrument and an Optical Measurement Device Based on a Color Focus Sensor

Danzl R., Helmli F., Scherer S., Alicona Imaging GmbH, AT

The determination of the roughness of technical surfaces plays an important role in scientific and industrial applications. Traditionally, the ISO conform determination of the roughness of a technical surface has been calculated using contact stylus [...]

Surface Roughness as a Function of the DLC Thickness Coating

Salvadori M.C., Martins D.R., Cattani M., University of Sao Paulo, BR

In this work we have analyzed the evolution of surfaces roughness coated with DLC. This study explores substrates with initial roughness (rms) between hundreds of nanometers and just few nanometers. We have used three substrates, [...]

Numerical Simulation of Droplet Shapes on Rough Surfaces

Patankar N.A., Chen Y., Northwestern University, US

It has been demonstrated that surface roughness causes superhydrophobicity. Our objective is to develop a numerical tool and study the relationship between the roughness characteristics and the apparent contact angle and motion of liquid drops [...]