| Steven Baldelli |
| Associate Professor |
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Office: 1025 SERC
Phone: (713) 743-5107
Email: sbaldelli@uh.edu
Education
B.S., Framingham State College, 1992
Ph.D., Tufts University, 1998
Honors, Fellowships, etc.
Postdoctoral fellow University of California, Berkeley
Visiting Professor Royal Institute of Technology, Stockholm
Publications
Homepage
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| Research Interests |
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Surface Chemistry
Our research interest is in the
field of physical chemistry, specifically adsorption and reactions
of molecules at the solid–liquid electrochemical interface.
These areas of chemistry represent some of our broad research
interests. We will use surface specific laser spectroscopy to
gain information about how molecules behave at the electrified
interface. The goal will be to bring a molecular perspective
to these systems to advance this field. This area overlaps with
many subfields in physical chemistry, such as electrochemistry,
photochemistry, surface chemistry, and materials science. The
applications are widely varied from solar cells, photocatalysis,
and environmental remediation to biomaterials, corrosion, and
energy conversion (fuel cells). Our group has specific research
projects in each of these areas.
Surface Electrochemistry
Electrochemistry is an effective
method to control adsorption and reactions at the solid-liquid
interface. When electrochemical measurements are combined with
spectroscopic probes, an unprecedented amount of knowledge is
obtained. This approach will be used to study organic monolayers
on a copper electrode since this serves as a model system to
test corrosion inhibitors.
Until recently, these interfaces
were inaccessible to molecule specific techniques due to the
obscuring effect of bulk solution. The development of nonlinear
spectroscopy and scanning probe techniques significantly improved
our access to these systems. Although there is a wealth of macroscopic
information on these interfaces, there is a distinct lack of
molecular level detail, which inhibits our understanding of
the chemistry that occurs there. By choosing specific systems
that broadly model large classes of interfaces, our goal is
to correlate the microscopic information with the macroscopic
properties, thus providing an essential view of the behavior
of molecules at these surfaces. We will use SFG in conjunction
with ECM (electrochemical microscopy) and electrochemical methods
to develop a more complete description of the system.
Laser Spectroscopy
The main techniques we use are
nonlinear optical spectroscopies, specifically sum frequency
generation (SFG) and second harmonic generation (SHG). These
spectroscopic methods have the advantage of being sensitive
only to the interface between two bulk media, thus allowing
us to investigate the surface region without interference from
bulk phase molecules. Further, SFG provides a vibrational spectrum
of the surface molecules, which is useful in determining the
orientation and chemical environment of the interfacial molecules.
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| Recent Publications |
- "Gas-Liquid Interface of Room-Temperature Ionic Liquids" Santos, C.; Baldelli, S. Chem. Soc. Reviews 2009, in press.
- Rivera-Rubero, S.; Baldelli, S. In ACS Symposium Series; Seddon, K. R., Ed.; ACS: 2009.
- "High Vacuum Cells for Classical Surface Techniques" Martinez, I. S.; Baldelli, S. Rev Sci. Instru. 2009, in press.
- Martinez, I. S.; Baldelli, S. In ACS Symposium Series; Seddon, K. R., Ed.; ACS: Philadelphia, 2009.
- "Initial Atmospheric Corrosion of Zinc exposed to Formic acid, Investigated by in-situ Vibrational Sum Frequency Spectroscopy and Density Functional Theory Calculations" Hedberg, J.; Henriquez, J.; Baldelli, S.; Johnson, C. M.; Leygraf, C. J. Phys. Chem. C 2009, 113, 2088.
- "Initial Atmospheric Corrosion of Zn: Influence of Humidity on the Adsorption of Formic Acid Studied by Vibrational Sum Frequency Spectroscopy" Hedberg, J.; Baldelli, S.; Leygraf, C. J. Phys. Chem. C 2009, 113, 6169.
- "Chemical Microscopy of Surfaces by Sum Frequency Generation Imaging" Cimatu, K.; Baldelli, S. J. Phys. Chem. C 2009, 113, 16575.
- "Alkyl Chain Interaction at the Surface of Room Temperature Ionic Liquids: Systematic Variation of Alkyl Chain Length (R=C1 C4) in both Cation and Anion of [RMIM][R-OSO3] by Sum Frequency Generation and Surface Tension" Santos, C.; Baldelli, S. J. Phys. Chem. B 2008, 113, 923.
- "The Gas Liquid Interface of Hydrophobic and Hydrophilic Room-Temperature Ionic Liquids and Benzene: Sum Frequency Generation and Surface Tension Studies" Santos, C.; Baldelli, S. J. Phys. Chem. B 2008, 112, 11459.
- "Sum Frequency Generation Imaging Microscopy of Patterned SAMs with Terminal -CH3, -OCH3, -CF2CF3, -C=C, -Phenyl, and -Cyclopropyl Groups" Cimatu, K.; Moore, H. J.; Barriet, D.; Chinwangso, P.; Lee, T. R.; Baldelli, S. J. Phys. Chem. C 2008, 112, 14529.
- "Chemical Imaging of Corrosion: Sum Frequency Generation Imaging Microscopy of Cyanide on Gold at the Solid-Liquid Interface" Cimatu, K.; Baldelli, S. J. Am. Chem. Soc. 2008, 130, 8030.
- "Chemical Imaging of Monolayers on Metal Surfaces: Applications in Corrosion, Catalysis, and Self-assembled Monolayers" Baldelli, S. ChemPhysChem 2008, 9, 2291.
- "Surface Structure of Room-Temperature Ionic Liquids at the Electrified Metal-Liquid Interface" Baldelli, S. Acc. Chem. Res. 2008, 41, 421.
- "Sum Frequency Generation Studies of Ammonium and Pyrrolidinium Ionic Liquids Based on the Bis(trifluoromethylsulfonyl)imide Anion at the Gas-Liquid Interface" Aliaga, C.; Baker, G. A.; Baldelli, S. J. Phys. Chem. B 2008, 112, 1676.
- "Ions at the Surface of a Room-temperature Ionic Liquid" Santos, C.; Rivera-Rubero, S.; Dibrov, S.; Baldelli, S. J. Phys. Chem. B 2007, 111, 7682.
- "Surface Orientation of Alkylimidazolium-based Ionic Liquids, [MMIM]+, [EMIM]+, and [BMIM]+ with [PF6]- and [MS]- ions" Santos, C.; Baldelli, S. J. Phys. Chem. B 2007, 111, 4715.
- "Orientation of 1-butyl-3-methylimidazolium Based Ionic Liquids at a Hydrophobic Quartz Interface Using Sum Frequency Generation Spectroscopy Romero, C. R.; Moore, H. J.; Lee, T. R.; Baldelli, S. J. Phys. Chem. C 2007, 111, 240.
- "Adsorption and Structure of Octadecanethiol on Zinc Surfaces as Probed by Sum Frequency Generation Spectroscopy, Imaging, and Electrochemical Techniques. Hedberg, J.; Leygraf, C.; Cimatu, K. A.; Baldelli, S. J. Phys. Chem. C 2007, 111, 17587.
- "Sum Frequency Generation Imaging of Microcontact-Printed Monolayers Derived from Aliphatic Dithiocarboxylic Acids: Contrast Based on Terminal Group Orientation Cimatu, K. A.; Moore, H. J.; Lee, T. R.; Baldelli, S. J. Phys. Chem. C 2007, 111, 11751.
- "Spatial Surface Analysis of Octadecanethiol Self-Assembled Monolayers on Mild Steel Using the Sum Frequency Generation Imaging Microscope Cimatu, K. A.; Baldelli, S. J. Phys. Chem. C 2007, 111, 7137.
- "Nanoscale Friction Varied by Isotopic Shifting of Surface Vibrational Frequencies Cannara, R. J.; Brukman, M. J.; Cimatu, K.; Sumant, A. V.; Baldelli, S.; Carpick, R. W. Science 2007, 318, 780.
- "Baldelli, S.; Gewirth, A. A. In Advances in Electrochemistry; Ross, P. N., Lipkowski, J., Eds.; Wiley: New York, 2007; Vol. 11.
- "Surface Chemistry of Room-Temperature Ionic Liquids Aliaga, C.; Santos, C.; Baldelli, S. Phys. Chem. Chem. Phys. 2007, 9, 3683.
- "A Sum Frequency Generation Study of the Room-Temperature Ionic Liquid-Titanium Dioxide Interface Aliaga, C.; Baldelli, S. J. Phys. Chem. C 2007, 112, 3064.
- "Sum Frequency Generation Spectroscopy of Dicyanamide Based Room Temperature Ionic Liquids. Orientation of the Cation and the Anion at the Gas-Liquid Interface Aliaga, C.; Baldelli, S. J. Phys. Chem. B 2007, 111, 9733.
- "Alkanethiol Monolayers at Reduced and Oxidized Zinc Surfaces with Corrosion Protection: A Sum Frequency Generation and Electrochemistry Investigation" H. P. Zhang and S. Baldelli J. Phys. Chem. B 2006, 110, 24062.
- "Characterization of 1-butyl-3-methylimidazolium and its Derivatives at the Liquid/quartz Interface using Sum Frequency Generation" Romero, C. R.; Baldelli, S. J. Phys. Chem. B 2006, 110, 6213.
- "Sum Frequency Generation and Electrochemical Measurements of 5-Methylbenzotriazole on Copper, Gold and Platinum Electrodes" C. Romero and S. Baldelli J. Phys. Chem. B 2006, 110, 11936.
- "Sum Frequency Generation on the Surface of Water/Room-Temperture Ionic Liquid Mixtures" Rivera-Rubero, S.; Baldelli, S. J. Phys. Chem. B 2005, 110, 15499.
- "Surface Characterization of 1-butyl-3-methylimidazolium-based Ionic Liquids, [BMIM][X], X= Br-, I-, PF6-, BF4-, (CF3SO2)2N-, SCN-, CH3SO3-, CH3SO4-, or (CN)2N- by Sum Frequency Generation Vibrational Spectroscopy" Rivera-Rubero, S.; Baldelli, S. J. Phys. Chem. B 2006, 110, 4756.
- "Sum Frequency Generation Imaging of CO on Platinum Surfaces" K. A. Cimatu and S. Baldelli J. Am. Chem. Soc. 2006, 128, 16016.
- "Sum Frequency Generation Microscopy of Microcontact-Printed Mixed Self-Assembled Monolayers" Cimatu, K. C.; Baldelli, S. J. Phys. Chem. B 2006, 110, 1807.
- "Surface Alignment of the N-Octadecylazatriquinacenium Cation as Determined by Sum Frequency Generation on the Surface of H2O and D2O" S. Baldelli, M. Mascal and J. C. Bertran Chem. Phys. Lett. 2006, 427, 72.
- "Sum Frequency Generation Spectroscopy and Double Layer Capacitance Studies of the 1-butyl 3-Methylimidazolium Dicyanamide - Platinum Interface." C. Aliaga and S. Baldelli J. Phys. Chem. B 2006, 110, 18481.
- "Preparation of Alkanethiol Monolayers on Mild Steel Surfaces Studied with Sum Frequency Generation and Electrochemistry" Zhang, H.; Romero, C. R.; Baldelli, S. J. Phys. Chem. B 2005, 109, 15520.
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