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Division of Polymer Science

Department of Chemistry

and Polymer Science

University of Stellenbosch

Private Bag X1

7602 MATIELAND

South Africa


Telephone: +27 (21) 808 3172

 

 

Student enquiries

Mrs E Cooper

+27(21) 808 3172

 

Where to find us


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GPS Coordinates:

S 33° 55' 58" E 18° 51' 59"

Equipment available at Polymer Science

Last revision: 13 November, 2020

 

Spectroscopy

 

Fluorescence/luminescence UV-Vis
FTIR FTIR microscope
FTIR with PAS

 

Fluorescence/luminescence spectrophotometer

Fluorescence/luminescence spectrophotometer

Room: 1014

Responsible person: Dr Helen Pfukwa / Lauren Ball

The Perkin Elmer LS 50B instrument has a wide range of automated accessories which makes it ideal for bio-analytical applications. It is equipped with monochromators on both excitation and emission sides and is capable of both emission and excitation of 200 – 800 nm scans. The instrument runs on Fl Winlab version 4 for data processing.

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UV-VIS spectroscopy

Ultraviolet-visible spectroscopy

Responsible person: Dr Helen Pfukwa / Chandré Smit

UV spectroscopy measures the wavelength (180 – 1100 nm) and degree of light absorbed by a compound. It is primarily used to measure the absorbance of conjugated and aromatic compounds. Temperature control (Peltier controlled cell holders: -10 – 105°C) is also available to observe the absorbance spectra as a function of temperature.

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FTIR

Fourier transform infrared spectrophotometer

Fourier transform infrared spectrophotometer

Room: 1009

Responsible person: Dr Helen Pfukwa / Janus Barnard

The Nicolet iS10 FTIR equipment is regarded as essential with regard to characterization of materials, and in particular with regard to following degradation reactions of polymers. As part of fundamental research teh FTIR spectrophotometer is a way of simply identifying subtle morphological changes. ATR and PAS detectors are already available for addition to the FTIR spectrometer.

This instrument consists of an ATR (attenuated total reflectance) unit for fast surface analysis of samples as well as a transmission–FTIR unit. It is a complete infrared spectroscopy system for routine analytical needs. It delivers the highest confidence in the verification and identification of materials and is designed for maximum assurance in its ability to sample and solve challenging problems with a minimal investment in time.

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FTIR Microscope

Fourier transform infrared microscope

FTIR microscope

Room: 1009

Responsible person: Dr Helen Pfukwa / Ben van der Westhuizen

The Nicolet iN10 IR Microscope is an integrated infrared microsampling system that provides the highest available IR sensitivity with no need for external FT-IR spectrometer. The integrated design delivers the highest possible throughput in infrared microscopy, which allows the analysis of samples as small as 50 microns with no need for LN2, while providing exceptional sensitivity down to 10 micron, when using the cooled detector.  All Nicolet iN10 infrared beam path mirrors are gold coated, with the exception of the objective and the condenser, for maximum performance in any sampling mode. We upgraded the microscope with a motorized stage for mapping experiments in transmission, reflection and ATR sampling modes.  The pixel size in imaging mode can be 50, 25, 6.25 and 2 microns (ATR). The imaging optical zoom provides 6.25 micron high spatial resolution in transmission and reflection, and better than 2 micron spatial resolution in ATR mode.

The Nicolet iN10 infrared microscope is also designed to provide the highest confidence in the results, offering valuable features for the day-to-day user like:

~ Simultaneous viewing and collection - ensures consistency between data and image

~ True-view aperture - ensures consistency between measured area and data

~ ValPro option - ensures system performance qualification, in any sampling mode

The Nicolet iN10 is fully automated and software controlled, with the exception of the stage, which can be manual or motorized. OMNIC Picta™ software interface provide a truly intuitive interface and it is specifically designed to allow non-skilled personnel to measure samples reliably, consistently and with minimum learning requirements.

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FTIR with PAS

Fourier transform infrared spectrophotometer with photo-acoustic cell

FTIR with photo-acoustic cell

Room: 2024

Responsible person: Dr AHA Roediger

A sample is put in the path of an infrared beam. Certain characteristic infrared frequencies are absorbed and the resulting transmittance spectrum is characteristic of the compound analysed.

In the photo-acoustic spectroscopy technique, modulated radiation is absorbed by the sample and causes a periodic temperature fluctuation within the optical absoption depth and periodic heat transfer to an ambient gas occurs. The photo-acoustic spectroscopy signal results from the periodic pressure fluctuations in this gas that are associated with the temperature modulation produced by the heat transfer from the sample.

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