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Equipment

EPR spectrometer

EMXplus

Continuous wave (CW) X-band (9.5 GHz) EPR spectrometer EMX-plus (Bruker BioSpin)

  • microwave bridge ER 04
  • high-sensitivity resonator ER 4119 HS-W1
  • digital temperature control unit ER 4141VT (100-500 K)

For further information please contact:
Uwe Lappan

Optical spectroscopy

ATR IR spectroscopy

  • FTIR Spectrometer (Vertex 70, Tensor II, Tensor 27 Bruker Optics GmbH, Ettlingen, Germany)
  • Attachment for polarised IR measurements by attenuated total reflexion (ATR) according to the Single-Beam-Sample-Reference (SBSR) concept (Optispec GmbH, Neerach, Switzerland)
  • Identification, quantification and structure elucidation of molecules with IR chromophores in solution and films
  • Thermostatable, UV-triggerable and pH resistant flow-through cells (IPF constructions) for dynamic in-situ ATR-FTIR measurements of films, solutions and adsorption processes
  • Orientation measurements by linear IR dichroism based on the different absorption of IR-radiation with parallel and vertical polarisation

For further information please contact:
Martin Müller

Circular Dichroism

  • Spectral Polarimeter (JASCO J-810, JASCO GmbH, Pfungstadt, Germany)
  • Characterisation of chirality of molecules or particles with UV/VIS chromophores in solution and films by different absorption of left handed and right handed circular polarized radiation
  • Thermostatable cuvettes and substrate holders for dynamic measurements

For further information please contact:
Martin Müller

UV/VIS Spectroscopy

  • UV/VIS Spectrometer (JASCO V-630, JASCO V-650, JASCO GmbH, Germany)
  • Thermostatable cuvette and substrate holders for dynamic measurements of solutions and films consisting molecules or particles with UV/VIS chromophores

For further information please contact:
Martin Müller

Polyelectrolyte analytics

Particle size analysis

Dynamic light scattering

Zetasizer Nano S/ZS (ZEN 1600)
(Malvern Pananalytical GmbH)

  • Dynamic Light Scattering,
  • scattering angle (detection): 173° (back scattering, NIBS®-Technology)
  • He-Ne-laser 4 mW, 632.8 nm, movable lens, attenuator

Applicable for particles in dispersion.

Determination of:

  • particle size (z average) and polydispersity index from cumulant analysis
  • particle size distribution (intensity, volume, number) from NNLS in an expanded concentration range.
  • Particle size -pH-analysis Particle size-temperature-analysis

Determination of:

  • Zetapotential
  • Zetapotential-pH-analysis
  • Zetapotential-temperature-analysis

Determination of:

  • the isoelectric point

Zetasizer 3000
(Malvern Instruments Ltd, UK)

  • Dynamic Light Scattering,
  • scattering angle (detection): 90°, Electrophoresis
  • He-Ne-laser 5 mW, 632.8 nm

Applicable for particles in dispersion.

Determination of:

  • particle size (z average) and polydispersity index
  • particle size distribution (intensity)
  • zetapotential

Zetamaster
(Malvern Instruments Ltd, UK)

  • Dynamic Light Scattering,
  • scattering angle (detection): 90°, Electrophoresis
  • He-Ne-laser 2 mW, 632.8 nm

Applicable for particles in dispersion

Determination of:

  • particle size (z average) and polydispersity index
  • particle size distribution (intensity)
  • zetapotential

Laser light diffraction

Mastersizer Microplus 
(Malvern Instruments Ltd, UK)

  • Laser Light Diffraction
  • scattering angle range: 0.03°-135°
  • He-Ne-Laser 2 mW, 632.8 nm

Determination of volume distribution of particles in aqueous dispersion

BlueWave

  • Laser Light Diffraction
  • Tri Laser Technology
  • scattering angle range: 0,2° - 163° (151 segments)
  • measuring range: 0,01 µm bis 2000 µm

Equipment:

  • one red laser (λ = 780 nm)
  • two blue laser (λ = 439 nm) 
  • laser power: 3 mW
  • SDS Sample Dosing System / wet dispersing modul with ultrasound

Suitable for powders and particles in dispersion

Image analysis modul SI

  • Digital image analysis
  • 6 size parameters and 11 shapes
  • measuring range: 2 µm bis 1000 µm

Equipment:

  • stroboscopic LED
  • high resolution full frame camera (5 million pixels)

Helos BR
(Sympatec GmbH)

Determination of

  • particle size with laser light diffraction
  • size range: 0,1 -875 µm
  • dry particles and suspensions

Delivery system:

  • Vibri: dry disperser, 1 mg – 1000 g, under vibration
  • Aspiros: micro dosing system for smallest amounts
  • SUCELL: wet disperser, analysis of suspensions
  • 5 measurement ranges

Image analysis

Sysmex FPIA-2100
(Malvern Panalytical GmbH)

  • Image analysis of particle size and shape
  • chemical identification with Raman-spectroscopy (Kaiser Optical Sysstems inc. RamanRxn1 spectrometer)
  • measureing fo dry and wet samples
  • automatic measurements possible
  • lenses: 2.5x, 5x, 10x, 20x, 50x
  • Raman-laser: wave length: 785 nm

Separation analysis in a centrifugal field

LUMiSizer®
(L.U.M. GmbH, Germany)

  • Separation analysis in a centrifugal field
  • Speed of the centrifuge: 200 rpm to 4000 rpm
  • Demixing phenomena of dilute or concentrated suspensions/emulsions as sedimentation, flotation and consolidation are directly measured (STEP®-Technology) for up to 12 different samples simultaneously.

Quantification of:

  • particle-particle-interactions
  • the compressibility of particles, flocs, gels
  • elastic behaviour of sediments

Calculation of:

  • velocity distribution in the centrifugal field
  • particle size distributions (intensity, volume, number)

LUMiFuge®
(L.U.M. GmbH, Germany)

  • Separation analysis in a centrifugal field
  • Speed of the centrifuge: 200 rpm to 3000 rpm
  • Demixing phenomena as sedimentation, flotation and consolidation are directly measured (STEP®-Technology).

LUMiReader®
(L.U.M. GmbH, Germany)

  • Separation analysis at gravity
  • Demixing phenomena as sedimentation, flotation and consolidation are directly measured (STEP®-Technology) for a large range of particle sizes under original storage conditions.
  • Up to three different samples are measured simultaneously.
  • Temperature control up to 60 °C

Charge detection

Measuring cells

Electro Kinetic Analyzer
(Anton Paar GmbH, Austria)

  • Streaming potential

Determination of charge on:

  • fibers
  • membranes
  • plates and films
Fibers
Membranes, plates and films (1 cm x 2 cm, movable)
Membranes, plates and films (3,5 cm x 2,5 cm, small or 7,5 cm x 2,5 cm, large)

Particle Charge Detector
(Mütek GmbH, Germany)

  • Streaming Potential

Determination of:

  • surface charge of particles in dispersion
  • charge density of polyelectrolytes

Surface and interface tension

SITA online tensiometer
(SITA Messtechnik, Dresden, Germany)

  • Bubble pressure
  • Bubble life time: t = 30 – 60 000 ms

The SITA online bubble pressure tensiometer is a all-round applicable, user friendly device to measure dynamic surface tension of systems with surface active components in liquids (surfactant solution, polymer solution, polymer-surfactant-complex solution, colors, cosmetics, emulsions).

Profil analysis tensiometer PAT-1
(Sinterface Technologies, Berlin, Germany)

  • Drop Profile Analysis
  • Determination of surface and interfacial tension of liquids
  • time dependence (t = 1 s - 24 h; 0.2 s resolution)

DSA-10
(Krüss GmbH, Germany)

  • contact angle
  • Characterization of wetting of solids
  • Determination of the free surface energy