Analysis & characterization services

EMI Twente has access to extensive state-of-the-art research facilities which it shares with the Membrane Science and Technology cluster (MST). We are fully integrated within the MST cluster and have direct access to their innovative knowledge. Moreover, affiliated with the University of Twente, we have access to the labs and equipment of various research groups, for example the cleanrooms of the MESA+ Institute for Nanotechnology.

Our expertise, experience and equipment allow us to analyze and characterize the properties of a broad range of membrane types: from open porous to dense, from polymeric to ceramic, flat sheet to hollow fiber membranes. The techniques we apply are also extremely diverse and include, amongst others, porometry (from 0.5 nm to 3000 nm), microscopy (optical, SEM and FE-SEM), high-pressure gas and vapour separation, thin film characterization (ellipsometry, quartz crystal microbalance), waterflux-fouling diagnosis, ion-exchange capacity (IEX), ion exchange membrane resistance and permselectivity measurements.

Available equipment

BET – specific surface area

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Cloud point measurements

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Contact angle

The contact angle is the angle measured through the liquid where a liquid-vapour interface meets a solid surface. From this the wettability of a solid surface can be calculated using the Young equation. Wettability describes the attempt of a solid to form a common interface with a liquid which comes into contact with it. A given system of solid, liquid, and vapor at a given temperature and pressure has a unique equilibrium contact angle. The equilibrium contact angle reflects the relative strength of the liquid, solid, and vapour molecular interaction.

DSC – differential scanning calorimetry

NDifferential Scanning Calorimetry (DSC) measures the amount of energy absorbed or released by a sample when it is exposed to a temperature change. This provides quantitative and qualitative data on endothermic and exothermic processes.

DSC is used to measure melting/crystallization behaviour, solid-solid transitions, polymorphism, degree of crystallinity, glass transition temperature, cross-linking reactions, oxidative stability, purity determinations, specific heat capacity and thermokinetics.

Various crucibles (pans) are available. A suitable pan needs to be chosen to avoid reactions with samples and with regard to the temperature range of the measurement.

Various chamber atmospheres are available: nitrogen, oxygen, air, argon, vacuum or a specific gas mixture.

Specifications:

Temperature range       -150°C to 2400°

Heating rate            0.001 to 50 K/min 

Sensors               TGA, TGA-DTA, TGA-DSC, TGA-DSCcp

Vacuum-tight           10-4 mbar

Atmospheres           Inert, oxidizing, static, dynamic, vacuum

Temperature resolution   0.001 K

Balance resolution       0.1 μg (over the entire weighing range)

Maximum sample load   35000 mg (incl. crucible), DSC: 0.19 ml, DTA: 0.9 ml

DSC enthalpy accuracy  ± 2% (for most materials) 

IIn house: TGA/DSC – MS Netzsch STA 449 FS QMS 403 C 


Ellipsometry

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