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Surface and Interface Characterization

Keywords: 
Surface tension, Interfacial tension, contact angle
Research Area: 
Physical Sciences
Location: 

Centro Joxe Mari Korta
Av. Tolosa 72
20018 Donostia-San Sebastián

Website: 
Contact: 

Dr. Amaia Agirre
amaia.agirre@ehu.eus
943018476

Available for external users?: 
Yes
Description: 

In the Surface and Interface characterization unit of POLYMAT, the analysis is devoted to the characterization of different type of surfaces, interfaces and polymeric films. Moreover, physical and chemical phenomena that occur at the interface of two phases, solid-liquid, solid–gas (air) and liquid–gas interfaces could me measured.

Tensiometer

The tensiometer is a powerful and accurate technique to measure static surface and interfacial tension of liquids. These direct measurements allow determination of a number of material and surface properties, such as dynamic contact angle, surface free energy, critical micelle concentration (CMC) and wettability. This information can be used to determine and understand different properties of the materials such as adhesion, absorption, adsorption, surface heterogeneity, density, porosity, powder wettability and material solubility to name but a few.

The following measurements are performed in our labs:
- Surface tension
- Interfacial tension
- Critical micelle concentration
- Powder wettability
- Dynamic contact angle

Goniometer

The goniometer is mainly used to measure a contact angle between a solid surface and a liquid. However, it permits not only to precisely determine the surface or interfacial tensions of liquids, but also the surface free energy of solids.

The obtainable measuring results are:
- Static contact angle
- Dynamic contact angle
- Surface and interfacial tensions
- Surface free energy
- Dispersion and polar distributions of the surface free energy

Equipment

Tensiometer

The main features for the KSV 700 tensiometer are:
- Fully automatic measurements avoids user dependant variation and saves time
- Select readymade experiment recipes or create custom programs for quick and repeatable operations
- Programmable probe and sample immersion and withdrawal cycle(s)
- Step by step powder protocol for simple powder wettability measurement
- Fully automatic CMC measurement, Schott titronic universal liquid dispenser
- Platinum Du Nouy ring

Technical Specifications