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Division of Colloid and Surface Chemistry ABSTRACTS

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Division of Colloid and Surface Chemistry ABSTRACTS American Chemical Society Division of Colloid and Surface Chemistry ABSTRACTS 228th ACS National Meeting Philadelphia, PA August 22-26, 2004 R. Nagarajan, Program Chair SUNDAY MORNING • Complex Fluids N. Dan, Organizer; I. Szleifer, Presiding Papers 1-4 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 5-9 • Applications of Porous Materials in Environmental Problems T. J. Bandosz, Organizer Papers 10-15 SUNDAY AFTERNOON • Complex Fluids N. Dan, Organizer; A. J. Liu, Presiding Papers 16-21 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 22-26 • Applications of Porous Materials in Environmental Problems T. J. Bandosz, Organizer Papers 27-32 MONDAY MORNING • Complex Fluids N. Dan, Organizer; Y. Gogotsi, Presiding Papers 33-38 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 39-44 • Surface Energy Characterization of Fibers, Fillers and Paper D. S. Keller, Organizer Papers 45-50 MONDAY AFTERNOON • Complex Fluids N. Dan, Organizer; K. I. Winey, Presiding Papers 51-57 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 58-62 • Surface Energy Characterization of Fibers, Fillers and Paper D. S. Keller, Organizer Papers 63-68 MONDAY EVENING • Posters: Fundamental Research in Surface and Colloid Chemistry R. Nagarajan, Organizer Papers 69-183 TUESDAY MORNING • Advanced Analytical Techniques to Determine Structural and Property Relationships in New Materials K. Putyera, Organizer Papers 184-191 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 192-196 • Nanostructures Based on Layered Transition Metal Chalcogenides G. Berhault, Organizer, Presiding Papers 197-203 TUESDAY AFTERNOON • Langmuir Lectures R. Nagarajan, Organizer; J. A. Schwarz, Presiding Papers 204-205 • Bio-Fuel Cells S. C. Barton, Organizer Papers 206-209 • Applications of Atomic Force Microscopy in Biomaterial Science J. L. Gilbert, Organizer Papers 210-216 WEDNESDAY MORNING • Complex Fluids N. Dan, Organizer; C. C. Co, Presiding Papers 217-221 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 222-227 • Applications of Atomic Force Microscopy in Biomaterial Science J. L. Gilbert, Organizer Papers 228-233 WEDNESDAY AFTERNOON • Complex Fluids N. Dan, Organizer; S. P. Wrenn, Presiding Papers 234-240 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 241-245 • Synthesis and Structure of Organic and Inorganic Oxide or Sulfide Composites S. Soled, Organizer Papers 246-251 THURSDAY MORNING • Complex Fluids N. Dan, Organizer; R. Tannenbaum, Presiding Papers 252-259 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Banares, Organizer Papers 260-265 • Synthesis and Structure of Organic and Inorganic Oxide or Sulfide Composites S. Soled, Organizer Papers 266-270 THURSDAY AFTERNOON • Complex Fluids N. Dan, Organizer; J. L. Harden, Presiding Papers 271-275 • Catalysis by Metal Oxides: Comparison Between Bulk Mixed Oxides, Supported Oxides, Oxide Clusters, Organometallic Oxides and Oxide Single Crystals M. A. Ban˜ares, Organizer Papers 276-280 • Synthesis and Structure of Organic and Inorganic Oxide or Sulfide Composites S. Soled, Organizer Papers 281-285 DIVISION OF COLLOID AND SURFACE CHEMISTRY 1. beads coated with the protein ActA have been shown to use actin polymerization MULTISCALE CHALLENGE OF MACROMOLECULAR COMPLEXES: FROM ION to move through actin-rich cytoplasmic extracts, much as L. cytogenes moves CHANNELS TO VIRUSES. Rob Phillips, Applied Physics, California Institute of through cells. The Theriot group has measured the mean speed of the beads as Technology, 1200 E. California Blvd, CA 91125, [email protected] a function of bead size, and has found that there is a maximum in the mean speed at a size similar to that of the bacterium. Previous theories of the Many of the most intriguing biological structures within cells are assemblies of propulsion mechanism predict either a monotonic increase or monotonic various components such as nucleic acids, proteins and lipids. This talk will decrease in mean speed as a function of bead size. We present a simple describe two case studies: one involving the life cycle of bacterial viruses and Brownian ratchet model for actin-based propulsion that yields a maximum in the the other of which involves the action of membrane-bound proteins whose mean speed with quantitatively reasonable predictions for the mean speed as a function is dictated by tension in the surrounding membrane. In particular, I will function of bead size. illustrate how continuum models can be exploited to produce a predictive description of these systems, in the first case treating DNA as a one-dimen- sional elastic rod and in the second, treating lipid-bilayer membranes as an 5. elastic sheet. It will be argued that though such models provide a useful starting PROBING THE ELECTRONIC STRUCTURE AND CHEMICAL BONDING OF METAL point for describing macromolecular complexes, there remain outstanding OXIDE CLUSTERS USING PHOTOELECTRON SPECTROSCOPY. Lai Sheng atomic-scale effects such as sequence-dependent elasticity of DNA and residue- Wang, Department of Physics, Washington State University, 2710 University specific properties of proteins which have experimental consequences and are Drive, Richland, WA 99352, Fax: 509-376-6066, [email protected] one of the central “multiscale” challenges in thinking about biological macromo- I will present our effort to elucidate the electronic structure and chemical lecular assemblies. bonding of metal oxide clusters using photoelectron spectroscopy and theoreti- cal calculations. One key advantage of cluster studies is the flexibility to create 2. clusters with any stoichiometry. I will show that metal oxide clusters with fixed THERMALLY ACTIVATED FLEXIBILITY IN BIOPOLYMERS. Philip C Nelson, numbers of metal atoms exhibit a behavior of sequential oxidation up to the Physics, University of Pennsylvania, David Rittenhouse Lab, 209 S 33d St, maximum oxidation state of the metal atoms. For oxygen-rich clusters, O2 unit Philadelphia, PA 19104, Fax: 215-898-2010, [email protected] begins to appear as per- or super-oxide. Comparison between photoelectron Recent experiments have measured a rate of spontaneous looping in short DNA spectra and theoretical calculations will be used to provide detailed information fragments that is orders of magnitude greater than the prediction of fluctuating about the structures and chemical bonding of oxide clusters. This information is elastic rod models (the wormlike chain and its successors). Generalizations of the prerequisite to understanding the chemical reactivities of the clusters and the wormlike chain model that include fixed, sequence-dependent kinks also providing insight into catalytic mechanisms of metal oxide materials. Preliminary appear to be unable to explain the new results. Instead, the experiments studies on the electronic structure of polyoxometalate anions in the gas phase strongly suggest that DNA can transiently develop sharp kinks, not accounted using electrospray and photoelectron spectroscopy will also be discussed. for by the linear rod elasticity assumed in existing models. The question then arises as to why the elastic-rod models have given such a good account of 6. other experiments on DNA, for example, single-molecule force-extension curves. REACTIVITY OF THE OXYGEN SITES IN THE V2O5-TIO2 (ANATASE) CATALYST: We formulate two simple models of DNA with thermally-activated, flexible tracts, A PERIODIC DFT STUDY. M. Calatayud, Laboratoire de Chimie The´orique, and show that these models can allow a significant population of such tracts Universite´ P. et M. Curie, 4, Pl Jussieu, 75252 Paris, France, Fax: while still fitting available force-extension data. +33144274117, [email protected], and Christian Minot, Laboratoire de Chimie Theorique, University Pierre et Marie Curie, Paris VI, case 137, 4, place 3. jussieu, Paris cedex 05 75252, France, Fax: 33-1-44-27-41-17, THEORY OF POLYMORPHISM IN BACTERIAL FLAGELLA. Thomas R. Powers [email protected] and Srikanth Srigiriraju, Division of Engineering, Brown University, BoxD, Supported metal-oxide catalysts are widely used in industrial processes. They Providence, RI 02912, Fax: 401-863-9009, [email protected] consist of two-dimensional metal oxide layers like vanadia deposed on a metal Escherichia coli and Salmonella swim using several flagella, each of which oxide support (titania, alumina, silica). The oxide/support interaction plays a consists of a rotary motor, a universal joint known as the hook, and a helical major role in the catalytic reaction but little is known on the structure at an filament which
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