Research in the Shaw group pushes state of the art analytical techniques to their cutting edge in order to develop novel understanding of chemical behavior at interfaces. Project areas are based on polymer surfaces, biofouling, and environmental corrosion processes.

Equipment

Note:  Visit the "Group Meeting" tab for in-depth information on the theoretical concepts and applications of many of these techniques.

Thermo IS50 Advanced FTIR with Custom Polarization Modulation Attachment

This instrument is a workhorse of the group, providing high resolution infrared spectra of our chemical systems via several acquisition geometries. The polarization modulated technique is particularly useful in detecting ultra-thin films (ca. 1 to 1000 nm) and providing molecular level details on structure and orientation.

IR

 

Raman Spectrometer

  • Spectra Physics 532 nm, 300 mW Excelsior laser
  • J.Y. Horiba iHR320 imagine spectrometer
  • Andor Newton CCD Detector

Our Raman spectroscopy system is a custom build, with the best components selected from multiple specialized vendors.  It is designed for maximum flexability and can acquire Raman scattered photons from bulk samples, thin film coatings, environmental substrates, or bulky 'real-world' objects.

 

Altos Photonics Vibrational Sum Frequency Generation (vSFG) Spectrometer - Coming Winter 2016

The vSFG system features a picosecond, diode-pumped laser at 1064 nm fundamental and an optical parametric generator to create tunable (2.3 to 10 µm) infrared light. The optical layout allows selection of polarization angles for all incident and collected beams, as well as direct conversion between vSFG and SHG measurements. A custom sample stage allows collection from samples in both vertical and horizontal sample planes, supporting dynamic wetting and vapor/liquid interface studies.

vSFG SchematicBird's Eye View

Alignment Optics and Sample StageLaser View

 

J.A. Wollam M-2000 Spectroscopic Ellipsometer

This research grade ellipsometer from J.A. Wollam is specially designed to accommodate the vertical sample position required for some work done in our lab.  It is a key technique we use to confirm the thickness of films or oxide layers on our substrates, as well as to measure refractive index and other optical contacts of the materials we use in all of our active research areas. 

 

Contact Angle Goniometer

The Thorlabs research grade scientific camera combines with the Eppendorf electronic dispensing system to create a system capable of capturing high resolution images of liquids coming into contact with a surface, providing a characterization of the wettability of a surface via contact angle measurement.

CH Instruments Electrochemistry Kit

We have two instruments from CHI: these are a 660-D electrochemical analyzer and an 1100-B electrochemical workstation.  Both of these systems are used to characterize, and sometimes to create, the chemical system in our research.  The 660-D is truly an all-in-one potentiostat with extensive capabilities from standard cyclic voltammetry all the way to impedance vs. potential scanning.  The 1100-B is used for screening analysis and to provide electrochemical control for experiments that combine spectroscopy with a defined current or applied electrochemical voltage.  For a full list of their capabilities, please click on the following links:

Stanford Research Systems QCM200

This SRS quartz crystal microbalance (QCM) measures mass and viscosity of fluids or gels that exist near surfaces and within thin films. The instrument reads the resonant frequency of a quartz crystal, which changes as a linear function of the mass of material deposited on the crystal surface (via the Sauerbrey equation). This QCM can resolve mass changes at the sub-nanogram level, enabling analysis of (sub)monolayer films. Additional applications include observations of phase transitions, swelling, and cross-linking. A flow cell attachment enables liquid and gas phase analyses to probe a variety of chemical systems.

SRS QCM200

VAC Genesis Glovebox

Our glovebox provides an inert nitrogen atmosphere using independent purifiers to control oxygen and water at the ppm level, facilitating experiments that would otherwise be very sensitive to oxidation and ambient moisture.

 

Our group utilizes several tools made available by instrumentation facilities and other research groups at the University of Iowa. Instruments key to our research are listed below.

Asylum Research MFP-3D Atomic Force Microscope (Central Microscopy Research Facility, University of Iowa)

This CMRF instrument, housed in the Tivanski Lab in the chemistry department of the University of Iowa, provides nanometer resolution topography images of our substrates and films.

Angstrom Engineering Amod Electron Beam Evaporator (Microfabrication Facility - Optical Science and Technology Center, University of Iowa)

This OSTC instrument, housed in the Iowa Advanced Technology Laboratory of the University of Iowa, is a versatile thin film deposition tool. We utilize this instrument to prepare substrates for a variety of research applications.

Smooth, reflective substrates can be prepared by thermally depositing a film of reflective metal on glass.