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The organized symposium attracted talks for two half-day sessions, and one poster session.  Following is the program held:

THURSDAY MORNING

 Section A

Cosponsored by ENVR and INOR
M. Villalobos and J. R. Bargar, Organizers

8:10 — Introductory Remarks.
8:15 —175. Geochemistry of marine ferromanganese crusts. J. R. Hein, A. Koschinsky, J. R. Bargar, T. A. Conrad
8:45 —176. Biogenic Mn oxide production in the Guaymas Basin deep-sea hydrothermal plume. G. J. Dick, B. Clement, S. Webb, J. Bargar, B. M. Tebo
9:15 —177. Bioinorganic chemistry of bacterial manganese oxidation. T. G. Spiro, B. M. Tebo, A. V. Soldatova, O. F. Oyerinde
9:45 —178. Enzymatic and abiotic Mn(II) oxidation: Cooperative or competitive pathways ? T. Behrends, S. Shaw, L. G. Benning
10:05 — Intermission.
10:15 —179. Synthesis, Characterization, and Applications of Layered Manganese Oxide Materials. S. L. Suib
10:45 —180. Complex reactivity of manganese oxides and their significance to environmental mineralogy: A review. S. E. O'Reilly
11:05 —181. Effects of Hoffmeister anions on nanostructure of cryptomelane MnO₂and its transformation to birnessite phase . M. A. Cheney, R. Jose, A. Banerjee, P. K. Bhowmik, S. Qian
11:25 —182. Electrochemical properties of different Mn dioxides : Application as electrode materials in energy storage devices. L. ATHOUËL, O. CROSNIER, D. BÉLANGER, T. BROUSSE
11:55 —183. Process and analytical chemistry of nano manganese oxide electrodes. J. T. Nurmi, S. Feng, P. G. Tratnyek, S. Chinni, B. M. Tebo

THURSDAY AFTERNOON

1:10 — Introductory Remarks.
1:15 —192. On the role of Mn(IV) vacancy in photoreductive dissolution of birnessite. K. D. Kwon, K. Refson, G. Sposito
1:45 —193. pH Effects on the Structure of Biogenic Mn-oxides . M. Zhu, M. Ginder-Vogel, S. J. Parikh, D. L. Sparks
2:05 —194. Role of process conditions on the controlled conversion of nanoplates to nanoneedles in birnessite without structural change. M. A. Cheney, R. Jose, A. Banerjee, P. K. Bhowmik, S. Qian, S. W. Joo
2:25 —195. The reactivity of siderophores at manganese oxide surfaces. O. Duckworth, J. R. Bargar, J. Peña, L. B. Saal, G. Sposito
2:55 —196. Kinetic modeling of oxidation of antibacterial agents by manganese oxide. C -H. Huang, H. Zhang, W -R. Chen
3:15 — Intermission.
3:25 —197. Interaction of several elements with biogenic Mn oxides formed by a Mn(II)-oxidizing fungus, Acremonium sp. KR21-2. T. Yukinori, M. Naoyuki
3:55 —198. Processes of Zn attenuation by microbial Mn oxides in mine-contaminated streams. C. C. Fuller, J. R. Bargar, Y. Arai, S. Webb
4:25 —199. Transition metal uptake by biogenic manganese oxide nanoparticles. J. Peña, J. R. Bargar, G. Sposito
4:45 —200. Selective sorption of cobalt over nickel on biogenic manganese oxides. K. Sasaki, T. Kaseyama, T. Hirajima
5:05 —201. Manganese oxide contribution to metal binding in soil systems. J. Antelo, E. Tipping, S. Lofts

 The talk for the supported speaker by the PRF is shown in boldface.

The POSTER SESSION program was as follows:

TUESDAY EVENING

Section B

Cosponsored by ENVR and INOR
M. Villalobos and J. R. Bargar, Organizers

5:00 - 7:00

115. Novel synthesis of layer-structured black birnessite nanomaterial from brown birnessite with complex shape under mild and acidic conditions. M. A. Cheney, P. K. Bhowmik, S. Qian, S. W. Joo, W. Hou, J. M. Okoh
116. Oxidative degradation of Chlorpyrifos by synthetic birnessites, analog to biogenic manganese oxides. J. Morales-Morales, R. Gibson, R. Lopez-Santiago, M. Villalobos
117. Redox dynamics at the Mn/Fe oxide interface. M. V. Schaefer, R. M. Handler, D. M. Cwiertny, M. M. Scherer
118. Sorption of polycyclic aromatic hydrocarbons (PAHs) onto synthetic analogs of a biogenic manganese oxide. M. Carrillo-Cardenas, R. López-Santiago, R. Gibson, M. Villalobos
119. Surface reactivity of arsenic (V) on two synthetic analogs of a biogenic manganese oxide. C. A. Salazar-Camacho, A. I. Olivos-Suarez, M. A. Cheney, J. R. Bargar, M. Villalobos
120. Photosynthesis and respiration control the solubility of Mn in natural aquatic systems. M. A. M. Kedziorek, A. C. M. Bourg

Summary statistics: 19 oral presentations, of which 9 were invited, and 6 poster presentations.

An average of 40 to 50 scientists attended the symposium, including presenters, of which, besides American, there were Canadian, Japanese, Chinese, French, Mexican, Colombian, Dutch, and Spanish scientists.

The oral presentation by the PRF-supported French scientist, Laurence Athouel, provided an excellent complement to the reactivity of Mn oxides, analog to those found in nature, through their electrochemical behavior, and their use as electrodes for energy storage devices.  It was communicated that among the advantages of the use of Mn oxides as pseudo-capacitive materials are their low cost and toxicity, their richness in crystal-chemical forms, their attractive specific capacitances (even at low electronic conductivity), and that it is possible to use mild aqueous electrolytes.  In particular, crystalline birnessite-like material showed high capacitances (660 uF/cm²) despite low specific surface area (SSA<20 m²/g), and XRD-amorphous materials showed pseudocapacitive behavior of 110 uF/cm² for SSA of 150 m²/g.