Shaw Ling Hsu, Coordinator
The Spectroscopy Facility encompasses three laboratories: Nuclear Magnetic Resonance, Vibrational Spectroscopy, and X-Ray Photoelectron Spectroscopy. These laboratories provide instruments and services to nearly two hundred researchers from the UMass system, the undergraduate colleges of the Five College Consortium, and our industrial outreach partners.
Nuclear Magnetic Resonance Laboratory
The NMR laboratory operates five Bruker instruments, which give polymer researchers access to a wide range of modern NMR methods useful on both liquid and solid samples. The laboratory possesses a wide variety of probes, which permit the analysis of any magnetic nucleus using virtually any pulse sequence. Operation of the facility is directed by Dr. L.C. Dickinson who also coordinates feasibility studies of projects, in order to direct experiments to the most appropriate instruments.
The NMR laboratory is open to the entire research community at UMass and affiliated institutions. Approximately 175 users, drawn from 35 research groups in six academic departments utilize its instrumentation as do several industrial research collaborators. The NMR Laboratory houses the following instruments: AVANCD600, AVANCE400, DPX300, DSX300, and an INFINITY PLUS.
The AVANCE 400 DPX 300 are equipped with a sample changer, pulsed field gradients, and multinuclear probes and can meet the needs of almost andy routine use. The can be remotely reserved during the day for a virtual walk-on basis or for longer periods in the evening. Advanced projects in liquids are performed on the AVANCE600. Studies of protein folding dynamics in water, 19F site positions in amino acid substituted receptor proteins, variable kinetics with change of counterion in palladium catalyzed polymerizations, polymer-polymer binding in supramolecular structures, and tacticity/regiospecificity of polypropylene from advanced Ziegler-Natta catalysts are several of the ongoing research projects that rely on this instrument.
For solids analyses, the DSX 300 and INFINITY PLUS spectrometers are equipped with a variety of probes for static, magic angle, and wideline applications for virtually any magnetic nuclide. Research projects include REDOR distance determinations in selectively enriched receptor proteins, detailed structures of layered silicates, morphology of polyethylene derivatives,
mobility of polypropylene chains in amorphous and crystalline phases, and 27AL-31P cross polarization in some surface modified zeolites.
Data can be processed offline in one of several PCs or R5000SGIs in either the GRC Tower or Conte Building.
All spectrometers and offline processing computers are part of an independent, fast optical fiber network.
Vibrational Spectroscopy Laboratory
The Vibrational Spectroscopy Laboratory houses several modified infrared and Raman spectrometers which are able to accommodate unconventional sample types. Available to the polymer research community are three Raman instruments incorporating dispersive or Fourier transform capabilities, a Bruker FT spectrometer, an HG 25 high throughput laser spectrometer, and a U-1000 high resolution laser spectrometer. The infrared instruments include Bruker 38-FTIR and Bruker 98 vacuum FTIR spectrometers, a Nicolet 60SXB FTIR spectometer, and a Perkin Elmer 2000 FTIR spectrometer. Capabilities of these instruments include; temperature sweeps from 6 to 900 degrees Kelvin, time-resolved spectroscopy at 6 microsecond resolution, time-resolved dynamic-mechanical infrared spectroscopy, low frequency Raman spectroscopy (to assess degree of cystallinity and crystallite size), and reflectance spectroscopy at a lateral resolution of 1 micron and depth resolution of 10 angstroms for air/solid, air/liquid, and liquid/liquid interfaces.
The extension of infrared reflectance techniques to air/liquid and liquid/ liquid interfaces using Langmuir troughs, allows examination for these films at either low compression rates or by step compression. These films can then be transferred to solid surfaces for further processing and analysis. Spectroscopic analysis software, developed in house, extends the laboratory's commercial modeling packages to facilitate spectral comparisons and lends insight into the static and dynamic behavior of polymer chains.
Interface Analysis Laboratory
Housed within the laboratory of T.J. McCarthy, the X-Ray Photoelectron Spectroscopy (XPS) Laboratory is well equipped to meet the challenges that new polymers present. At the core of this facility, two Physical Electronics Inc., 5000 Series spectrophotometers, provide researchers with elemental analysis of polymer surfaces, measurement of surface composition, and depth profiling. Both spectrophotometers are dual anode, fixed lens instruments and one is equipped with an ion source, enabling ion scattering spectroscopy. This instrumentation also allows for the non-destructive assessment of sample lyophobicity.
Complementing this facility's instrumentation array is a Rame-Hart Inc., Model 100, NRL contact angle telegoniometer, and a Zygo Corporation non-contact profilometer. Training or consultation is provided by the director
|Last Updated ( Tuesday, 05 August 2008 )|
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