Electron transfer to iron(III) oxide colloids

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5570873

Mulvaney, P; Grieser, F; Swayambunathan, V; Meisel, D

The electron transfer reaction from viologen radicals to colloidal iron(III) oxide and oxyhydroxide particles was investigated by pulse and steady-state radiolysis techniques. The rate of electron injection to oxyhydroxide particles was clearly controlled by their surface charge and in the region near the isoelectric point, the electron transfer rate is slower than the diffusion-controlled rate by at least two orders of magnitude. Conductivity measurements clearly reveal the occurrence of protonation reactions immediately following the initial electron transfer step. On the basis of the experimentally measured ratio of protons consumed to electrons injected, a mechanistic pathway describing the sequence of protonation reactions is proposed. The competition between surface trapping of charge and the migration of charge into the interior of the particles and the factors controlling these two events are also discussed. 17 refs., 3 figs.

• Research Organization: Melbourne Univ., Parkville (Australia). Dept. of Physical Chemistry; Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5570873
• Report Number(s): CONF-8710229-1; ON: DE88002885
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400600* -- Radiation Chemistry
ADSORPTION
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
COBALT 60
COBALT ISOTOPES
COLLOIDS
DECOMPOSITION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON TRANSFER
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
HYDROGEN COMPOUNDS
HYDROXIDES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IRON
IRON COMPOUNDS
IRON OXIDES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETICS
LEPTONS
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PH VALUE
PHYSICAL PROPERTIES
PROTONS
PULSE TECHNIQUES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOISOTOPES
RADIOLYSIS
REACTION KINETICS
REDUCTION
SIZE
SORPTION
STEADY-STATE CONDITIONS
TIME DELAY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE
YEARS LIVING RADIOISOTOPES
YIELDS