The document contains information from multiple studies and experiments: 1) It lists the members of the Allen University CMaES Group and their academic levels and disciplines. 2) It describes an experimental setup used to study the electrochemical characteristics of aged carbon-supported platinum catalysts, including the working electrode, reference electrode, counter electrode, and sweep rate. 3) It provides results from a study that synthesized rare-earth manganites, including the crystal system, space group, refined lattice parameters, and determination of partial occupancies and crystallite size from Rietveld refinement. 4) It cites a study on the nanotoxicity of platinum, gold, and silver nanoparticles.

1. Allen University CMaES Group
• Tinom Shokfai, Senior Biology
• Angel Risher, Senior Biology
• Esther Olukunle, Junior Biology
• James Gadson, Junior Math
• Chukwuemelie Onwubuya, Junior Math
• Raluchukwu Onwubuya, Junior Math

2. Electrochemical
Characteristics of Aged
Carbon-Supported Pt
Catalysts
• Working Electrode : 0.196
cm2 Pt disk
• Reference Electrode : Pt wire
in 6.4 mM (K3Fe(CN)6)
solution
• Counter Electrode : Ag/AgCl
in 4M KCl
• 100 mv/s sweep rate from -0.6
to 1 V
Experimental Setup for Baseline
Measurements

3. Solid State Synthesis of Rare – Earth (RE) Manganites
La0.5SrxCa0.5-xMnO3
Crystal system Tetragonal
SG I4/mcm (140)
Refined parameters
Partial occupancy: x = 0.204(8)
Lattice parameters: a = 5.41465 (15) Å
c = 7.7611 (3) Å
Crystal structure of major phase was refined from the
Rietveld refinement. Partial occupancies for Sr and Ca at
the La site were also refined from the Rietveld refinement.
Crystallite size and strain were estimated from peak width
with NIST LaB6 660c as external standard.

4. Nanotoxicity Studies of Pt, Au, and Ag Nanoparticles
Crone, B, et. al.

5. Acknowledgements
• NNSA – MSIP Progam
- Cory Jackson, NNSA Program Manager
- Dimitri Kusnezov, NNSA Program Director
• Department of Energy
-Los Alamos National Laboratory (LANL)
Materials Physics & Applications Group (MPA-11)
-Lawrence Livermore National Laboratory (LLNL)
• President Lady June Cole and supporting staff at AU
-Michelle Young, Office of Sponsored Research Programs
-William Robinson, Title III Programs