Chemistry  
 

Analytical Instrumentation for Chemistry

 
Note: Click on any of the images below for a larger view.
 
TA Instruments Q20 Differential Scanning Calorimeter
TA Instruments Q20 Differential Scanning Calorimeter The Differential Scanning Calorimeter (DSC) can be used to investigate the thermal properties of substances such as polymers and crystals.  A small aluminum pan is filled with a sample and heated or cooled in a very precise furnace.  The amount of heat absorbed or released by the sample, compared to an empty reference pan, is recorded.  From the resulting plot, phase transition temperatures (for example, the melting point) can be identified and their changes in enthalpy and entropy can be calculated.  This instrument includes an auto-sampler which can be programmed for up to fifty samples, making it useful in larger classes. This instrument was purchased new in 2009 with funding from the Science Initiative.
 
Buck Scientific 210 VGP Atomic Absorption Spectrophotometer
Buck Scientific 210 VGP Atomic Absorption Spectrophotometer Atomic Absorption (AA) is primarily used to determine the concentrations of elements in solution and it is particularly useful for metallic elements, such as copper and lead.  A very hot flame is used to break molecules into individual atoms and then a single type of atom is detected using a special lamp system.  This instrument is used for analysis in courses such as CY112: General Chemistry II and CY215: Quantitative Analysis.
 
Thermo Scientific Evolution 300 Ultraviolet-visible Spectrophotometer
ThermoScientific Evolution 300 Ultraviolet-visible Spectrophotometer This spectrometer operates in the ultraviolet and visible regions of the spectrum.  It has two main modes.  In one mode, the amount of light absorbed by a sample is measured over a range of wavelengths, producing a graph known as an absorption spectrum, which can provide information about the structure of molecules in the sample solution.  In the other mode, the light absorbed by a sample is measured at a single wavelength and compared to standards with known concentration in order to determine the concentration of one component of the sample.  Both modes are used routinely in chemistry courses and this type of spectrometer is one of the first that students will learn to use.  This instrument was purchased new in 2008 with funding from the Science Initiative.  It also has an attachment that allows the temperature of the sample to be adjusted during measurement.
 
Jasco FTIR-4100 Infrared Spectrophotometer with Pike MIRacle ATR
Jasco FTIR-4100 Infrared Spectrophotometer with Pike MIRacle ATR Fourier-Transform Infrared (FTIR) spectrometry employs wavelengths in the infrared region of the spectrum to investigate bonding and functional groups in molecules.  This technique is useful primarily for organic chemistry in which a compound may be identified from its absorption spectrum.  At Aquinas, students regularly use this instrument in CY211: Organic Chemistry I and CY212: Organic Chemistry II.  The Attenuated Total Reflectance (ATR) accessory allows users to collect spectra quickly and without extensive sample preparation.  This instrument was purchased new in 2007 with funding from the Science Initiative.
 
MIDAC Prospect-IR Infrared Spectrophotometer
MIDAC Prospect-IR Infrared Spectrophotometer Our second FTIR, this instrument is also useful for probing the structures of small organic molecules.  When using this instrument, students learn various sample preparation techniques such as making a mull or KBr pellet.
 
Horiba/Jobin Yvon Fluoromax-4 Spectrofluorometer
Horiba/Jobin Yvon Fluoromax-4 Spectrofluorometer Fluorescence is the light emitted by an excited molecule.  Not all molecules fluoresce, but those that do can be investigated using this instrument.  The spectrofluorometer can be used either qualitatively or quantitatively.  Studies of reaction kinetics are also possible with the accessory that allows one to change the temperature of a sample during a measurement.  Students use this instrument in CY346: Instrumental Methods of Analysis and some other courses.  This instrument was purchased new in 2008 with funding from the Science Initiative.
 
Anasazi Eft-60 Nuclear Magnetic Resonance Spectrometer
Anasazi Eft-60 Nuclear Magnetic Resonance Spectrometer Nuclear Magnetic Resonance (NMR) is a technique that probes a single type of atomic nucleus in a sample.  These nuclei provide information about the structures of molecules in that sample.  The original Varian instrument at Aquinas was upgraded in 2005 with Fourier-Transform software and a new probe for hydrogen-1 nuclei (protons) and further improved in 2006 with the capacity for carbon-13 nuclei using funds from the Science Initiative.  Students use the instrument primarily for CY212: Organic Chemistry II and CY346: Instrumental Methods of Analysis.
 
Agilent 1100 Series High-Performance Liquid Chromatograph
Agilent 1100 Series High-Performance Liquid Chromatograph High-performance liquid chromatography (HPLC) is a separation technique that employs a pressurized mixture of solvents to pump a sample through a short packed column.  Different types of molecules in the sample pass through the column at different rates, and thus elute from the end of the column at different times.  As the sample passes out of the column, molecules are detected with a tiny version of an UV-vis spectrophotometer.  Sophisticated software controls the instrument and displays the resulting data.  The department has two identical instruments of this type, which were acquired as donations from Pfizer's Holland Research and Development laboratory in 2003.  Students primarily use HPLC in CY346: Instrumental Methods of Analysis.
 
Hewlett Packard 6850 Series Gas Chromatograph
Hewlett Packard 6850 Series Gas Chromatograph Gas chromatography (GC) is a separation technique that employs an inert gas, such as nitrogen or helium, to force a gaseous sample through a very long capillary column.  Different types of molecules in the sample experience stronger or weaker interactions with the coating on the inside surface of the capillary, thus passing through the column at different rates.  As each type of molecule exits the column, it is detected by the Flame Ionization Detector (FID).  A dedicated computer with specialized software controls the instrument and displays the resulting data.  This instrument was acquired as a donation from Pfizer's Holland Research and Development laboratory in 2003.  Students use GC in CY211: Organic Chemistry I, CY212: Organic Chemistry II, and CY346: Instrumental Methods of Analysis.
 
Hewlett Packard 5890 Series Gas Chromatograph
Hewlett Packard 5890 Series Gas Chromatograph Our second GC, this instrument operates similarly to the HP 6850 described above. It also has Flame Ionization Detection.
 
Hewlett Packard GCD Series II Gas Chromatograph-Mass Spectrometer
Hewlett Packard GCD Series II Gas Chromatograph-Mass Spectrometer Gas Chromatography-Mass Spectrometry (GC-MS) is a dual technique that combines an ordinary gas chromatograph, similar to the HP 6850 or HP 5890 described above, with a quadrupole mass spectrometer acting as the detector. Mass spectrometry is a powerful technique because it provides simultaneous qualitative and quantitative data; that is, the user receives information about the identities of molecules in the sample as well as the amount of each type of molecule. Students gain experience with this instrument in CY346: Instrumental Methods of Analysis, and some other courses.