|
|||||||||||||||||||||||||||||||||
BIOGRAPHICAL SKETCH
Dr. Anastasios P. Angelopoulos Assistant Professor Chemical & Materials Engineering Department |
 |
EDUCATIONAL BACKGROUND
· BS, Chemical Engineering, 1984, Tufts University
· MS, Chemical Engineering, 1988, Tufts University
· PhD, Chemical Engineering, 1996, Princeton University
PROFESSIONAL POSITIONS
· Assistant Professor, University of Cincinnati, 2006 to date
· Senior Materials Scientist, General Motors Corp., Honeoye Falls, 2002 to 2006
· Assistant Professor, University of Massachusetts Lowell, 1998 to 2002
· IBM Corporation, Endicott, 1988 to 1998
· Research Assistant, U.S. Army Materials Technology Laboratory, Watertown, 1984 to 1988
HONORS
· Fuel Cell Activities Achievement Award, GM Corporation, 2006
· Invention Achievement Award, IBM Corporation, 1998
· Guest Member, IBM Academy of Technology, 1996
· IBM Corporation Fellowship, Princeton University, 1992-1996
· U.S. Army Fellowship, Tufts University, 1985-1987
· Magna Cum Laude, Tufts University, 1984
PATENTS PUBLISHED
· A.P. Angelopoulos, C. Ji, and M. Mathias, "Control of Polymer Surface Distribution on Diffusion Media for Improved Fuel Cell Performance", U.S. Pre-grant 2005084742AA (2005).
· A.P. Angelopoulos, J.P. Healy, and C. Hochgraf, "Addressing One MEA Failure Mode by Controlling MEA Catalyst Layer Overlap", U.S. Pre-grant 2005058870AA (2005).
· A.P. Angelopoulos, J. Cangelosi, J.A. Kotylo, L.J. Matienzo, N.L. Shaver, “Promoting Adhesion between A Polymer and A Metallic Substrate”, U.S. Patent 6,908,684 (2005).
· A.P. Angelopoulos, L.J. Matienzo, G.W. Jones, T.R. Miller, W.D. Taylor, “Method of Uniformly Depositing Seed and a Conductor and The Resultant Printed Circuit Structure”, U.S. Pat. 6,447,914 (2002).
· A.P. Angelopoulos, G.W. Jones, R.W. Malek, H. Marcello, and J. McKeveny, "Organic Electronic Package and Method of Applying Palladium-Tin Seed Layer Thereto", U.S. Patent 6,025,057 (2000).
· A.P. Angelopoulos, G.W. Jones, L.J. Matienzo, T.R. Miller, V.R. Markovich, "Seed Deposition in Electroless Plating", U.S. Patent 5,997,997 (1999).
· A.P. Angelopoulos, G.W. Jones, L.J. Matienzo, T.R. Miller, and V.R. Markovich, "Method of Reducing Seed Deposition for Electroless Plating on Polymer Insulators", U.S. Patent 5,935,652 (1999).
· A.P. Angelopoulos, G.W. Jones, R.W. Malek, H. Marcello, and J. McKeveny, "Organic Electronic Package", U.S. Patent 5,866,237 (1999).
SELECTED PUBLICATIONS
· Y.T. Cheng, D.E. Rodak, A.P. Angelopoulos, and T. Gacek, “Microscopic Observations of Condensation of Water on Lotus Leaves”, Applied Physics Letters 87, 194112 (2005).
· A.P. Angelopoulos and Y. Kim, "The Effect of Nafion Sulfonate Surface Concentration on Cationic Polyacrylamide Adsorption", Fuel 81, p. 2167-2171 (2002).
· A.P. Angelopoulos, "Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces” Journal of Colloid and Interface Sci. 243, p. 292-299 (2001).
· Y. Kim, D. Oblas, A.P. Angelopoulos, S.A. Fossey, and L.J. Matienzo, "Adsorption of a Cationic Polyacrylamide onto the Surface of a Nafion Ionomer Membrane", Macromolecules 34, p. 7489-7495 (2001).
· A.P. Angelopoulos, L.J. Matienzo, and G.W. Jones, "Thermally Induced Intramolecular Surface Reactions on a Photoimageable Dielectric", Langmuir 16, p. 1078-1082 (2000).
· D. Golomb and A.P. Angelopoulos, "A Benign Form of CO2 Sequestration in the Ocean", Greenhouse Gas Control Technologies, 5th International Congress (2000).
· A.P. Angelopoulos, L.J. Matienzo, and J.B. Benziger, "The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide", Journal of Colloid and Interface Science 212, p. 419-425 (1999).
· A.P. Angelopoulos, J.B. Benziger, and S.P. Wesson, "Cationic Polyacrylamide Adsorption on Epoxy Surfaces," Journal of Colloid and Interface Science 185, p. 147-156 (1997).
· N.S. Schneider, C.F. Mee, R. Goydan, and A.P. Angelopoulos, "Incremental Vapor Sorption in a Phase Segregated Polyurethane Elastomer," Journal of Polymer Science, Part B 27, p.939-956 (1989).
· A.P. Angelopoulos, J.H. Meldon, and N.S. Schneider, "Analysis of Membrane Permeation from a Deposition Droplet," Journal of Membrane Science, p.317-329 (1987).
RESEARCH INTERESTS
NANOTECHNOLOGY AND FUEL CELLS
Background and Motivation. Coatings employed in the fuel cell industry have stringent performance and cost requirements. In the case of proton exchange membrane (PEM) fuel cells used by the automotive industry, such requirements arise from the need to manage the large fluctuations in water production that result from a typical drive cycle. Examples range from hydrophobic coatings for graphite fiber gas diffusion media to both hydrophobic and hydrophilic coatings for graphite-epoxy composite bipolar plates to the catalytic coatings employed as electrodes on perfluorosulfonic acid membranes. Existing coatings prepared utilizing dry chemical processing or conventional wet chemical methods cannot meet automotive competitive performance and cost targets.
Alternate Approach. Multilayer self-assembly is currently being investigated at the University of Cincinnati as a convenient and cost-effective alternative to create nano-structured coatings specifically tailored to fuel cell requirements. The approach involves the self organization of alternating layers of positively and negatively charged polymers and nanoparticles onto surfaces. A cross-section of a typical multilayer coating is shown in the schematic below:
Advantages. The process occurs in the liquid phase and, unlike dry methods, can be used to uniformly coat the large and complex shapes utilized in fuel cell stacks. In addition, unlike standard wet-chemical coating approaches such as spray or rod application, multilayer self assembly permits coating structure design and optimization on the nanoscale. Finally, the process can be inexpensively implemented utilizing dip-tanks common to the metal plating industry.
Demonstration. We have recently demonstrated the first application of this approach to fuel cells by creating bipolar plate coatings with well-defined surface wetting properties for the automotive industry.
Future Work. Collaborations are currently being fostered between local nanoparticle raw material suppliers, the University of Cincinnati, and end users in the automotive industry to develop and commercialize self-assembled coatings for fuel cell applications.
OTHER AREAS OF INVESTIGATION
Dr. Angelopoulos’ general research interest is the industrial application of fundamental concepts in colloid and surface science to create membranes and coatings with unique functions. Specific areas of active research are as follows:
I. Coating nano-design.
II. Membranes.
III. Colloid stabilization and complex fluids.
I. COATING NANO-DESIGN
Manipulation of matter on the nanoscale has the potential to create revolutionary high performance materials for a number of industries. One approach which is the focus of Dr. Angelopoulos’ research is to employ directed self-assembly techniques (i.e., the use of structure-directing agents) to design two- and three-dimensional structures for specific applications. This approach has the advantage requiring minimal capital investment for industrial application. Applications for which this approach has been demonstrated are listed below and their further development forms the basis for Dr. Angelopoulos’ future research in the area of nano-coatings:
A. Irreversible adsorption of mono-layers for microelectronics fabrication, fuel cell miniaturization, and arterial transplants (1-15).
B. Microwave processing to create coatings which combine chemically incompatible materials (16,17).
C. Multi-layer self assembly of polymers and nanoparticles for fuel cell components as discussed above (18-20).
II. MEMBRANES
Dr. Angelopoulos’ focus in this area is developing membranes with tailored responses to environmental conditions. Examples of Dr. Angelopoulos’ research are as follows:
A. Incorporation of chromophores into ionomer membranes for durable optical sensor applications (21).
B. Develop understanding of membrane degradation mechanisms under cyclic electrochemical load conditions for automotive fuel cell applications (22,23).
C. Optimization of heterogeneous membrane structure to optimize barrier properties against chemical agents (24,25).
III. COLLOID STABILIZATION AND COMPLEX FLUIDS
Highly dispersed systems have formed the basis for the creation of the membranes and coatings previously discussed. A detailed understanding of how such stabilization is achieved and its influence on final product performance is therefore another important research interest. Particular systems of interest are as follows:
A. Dispersion of nanoparticles prepared via emulsion polymerization and their application in organic nanocoating fabrication (16,17).
B. Stabilization of inorganic nanoparticles in aqueous suspension and their application in inorganic nanocoating fabrication (18-20).
C. The use of complex fluids to fabricate fuel cell electrodes (22,23).
D. Stabilization of supercritical fluid emulsions for oil-in-water templating to create well-defined porous polymers and inorganic materials (26).
REFERENCES
(1). Y.T. Cheng, D.E. Rodak, A.P. Angelopoulos, and T. Gacek, “Microscopic Observations of Condensation of Water on Lotus Leaves”, Applied Physics Letters 87, 194112 (2005).
(2) A. P. Angelopoulos, L.J. Matienzo, and G.W. Jones, "Thermally Induced Intramolecular Surface Reactions on a Photoimageable Dielectric", Langmuir 16, p. 1078-1082 (2000).
(3) A.P. Angelopoulos, L.J. Matienzo, and J.B. Benziger, "The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide", Journal of Colloid and Interface Science 212, p. 419-425 (1999).
(4) A.P. Angelopoulos, G.W. Jones, R.W. Malek, H. Marcello, and J. McKeveny, "Organic Electronic Package", U.S. Patent 5,866,237 (1999).
(5) A.P. Angelopoulos, L.J. Matienzo, G.W. Jones, T.R. Miller, W.D. Taylor, “Method of Uniformly Depositing Seed and a Conductor and The Resultant Printed Circuit Structure”, U.S. Patent 6,447,914 (2002)
(6) A.P. Angelopoulos, G.W. Jones, R.W. Malek, H. Marcello, and J. McKeveny, "Organic Electronic Package and Method of Applying Palladium-Tin Seed Layer Thereto", U.S. Patent 6,025,057 (2000).
(7) A. P. Angelopoulos, G.W. Jones, L.J. Matienzo, T.R. Miller, V.R. Markovich, "Seed Deposition in Electroless Plating", U.S. Patent 5,997,997 (1999).
(8) A.P. Angelopoulos, G.W. Jones, L.J. Matienzo, T.R. Miller, and V.R. Markovich, "Method of Reducing Seed Deposition for Electroless Plating on Polymer Insulators", U.S. Patent 5,935,652 (1999).
(9) A.P. Angelopoulos, J.B. Benziger, and S.P. Wesson, "Cationic Polyacrylamide Adsorption on Epoxy Surfaces," Journal of Colloid and Interface Science 185, p. 147-156 (1997).
(10) A.P. Angelopoulos, J. Cangelosi, J.A. Kotylo, L.J. Matienzo, N.L. Shaver, “Promoting Adhesion between A Polymer and A Metallic Substrate”, U.S. Patent 6,908,684 (2005).
(11) A.P. Angelopoulos, K.A. Marx and K.S. Oh, “The Use of Aqueous Enzymatic Polymerizaiton of Amphiphilic Alkyl Tyrosine Derivatives as Environmentally Benign Coatings in the Microelectronics Industry.” Polymer Interfaces and Thin Films. Materials Research Society, Pittsburgh, PA 710:207-212 (2002).
(12) A.P. Angelopoulos and Y. Kim, "The Effect of Nafion Sulfonate Surface Concentration on Cationic Polyacrylamide Adsorption", Fuel 81, p. 2167-2171 (2002).
(13) Y. Kim, D. Oblas, A.P. Angelopoulos, S.A. Fossey, and L.J. Matienzo, "Adsorption of a Cationic Polyacrylamide onto the Surface of a Nafion Ionomer Membrane", Macromolecules 34, p. 7489-7495 (2001).
(14) A.P. Angelopoulos and A. Crugnola, “Perflurosulfonate Ionomer Adsorption onto PAA-Grafted e-PTFE”, manuscript in preparation
(15) A.P. Angelopoulos, "Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces”, J. of Colloid and Interface Sci. 243, p. 292-299 (2001).
(16) A.P. Angelopoulos, C. Ji, and M. Mathias, "Control of Polymer Surface Distribution on Diffusion Media for Improved Fuel Cell Performance", U.S. Patent filing, GM No. GP304011, 2003.
(17) A.P. Angelopoulos and S. Perl, “Use of Variable Frequency Microwave to Control the Teflon Profile of Gas Diffusion Media”, U.S. Patent filing, GM No. GP305706, 2005.
(18) A.P. Angelopoulos and S. Peters, “Removal of Silicon Dioxide Coating from Bipolar Plate Lands”, U.S. Patent filing, GM No. GP308068, 2006.
(19) A.P. Angelopoulos and S.Peters, “Nanoparticle Coating Process for Fuel Cell Components”, U.S. Patent filing, GM No. GP308003, 2005.
(20) A.P. Angelopoulos and S. Peters, “Multilayer Adsorption of Silica Nanocomposites”, U.S. Patent filing, GM No. GP307594, 2005.
(21) A.P. Angelopoulos and Y. Kim, “Diffusion of Epoxy and Acrylic Acid Based Azo Polymers into Perfluorosulfonate Ionomer Memberanes:, Abstr Pap Am Chem S 222: 64-COLL Part 1 AUG 2001.
(22) A.P. Angelopoulos, J.P. Healy, and C. Hochgraf, "Addressing One MEA Failure Mode by Controlling MEA Catalyst Layer Overlap", U.S. Patent filing 10-664345, 2003.
(23) B. Sompalli, B. Litteer, J.P. Healy, A.P. Angelopoulos, H. Gasteiger, W. Gu, and E. Halik, “Membrane Electrode Assembly with Improved Edge Architecture”, U.S. Patent filing, GM No. GP305831, 2005.
(24) N.S. Schneider, C.F. Mee, R. Goydan, and A.P. Angelopoulos, "Incremental Vapor Sorption in a Phase Segregated Polyurethane Elastomer," J. Polymer Sci. Part B 27, p.939-956 (1989).
(25) A.P. Angelopoulos, J.H. Meldon, and N.S. Schneider, "Analysis of Membrane Permeation from a Deposition Droplet," Journal of Membrane Science, p.317-329 (1987).
(26) D. Golomb and A.P. Angelopoulos, "A Benign Form of CO2 Sequestration in the Ocean", Greenhouse Gas Control Technologies, 5th International Congress (2000).