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Palladium in Non-Aqueous Solvents. Formation, Stability, and Film Forming Properties.
KANSAS STATE UNIV MANHATTAN DEPT OF CHEMISTRY
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Palladium atoms in cold acetone, ethanol, and other organic solvents cluster to form living colloidal particles. The Pd colloids are stable for months at room temperature in acetone, and their particle sizes about 8 nm vary slightly according to solvent Pd ratio, and warming procedures. The particles are stabilized by both steric stabilization solvation and by incorporation of negative charge. They are living in the sense that production of larger particles and films can be accomplished simply by solvent removal. The Pd films at room temperature by solvent evaporation have semiconductor properties rather than metal like conductivity due to the incorporation of substantial portions of organic solvent and small amounts of solvent fragments. Upon heat treatment the films become smoother, give up organic solvent, and resistivity decreases. These are the first examples of non-aqueous Pd colloids, and the first examples of film formation from such colloidal solutions. Keywords Free atoms, Solvated, Nonaqueous colloids, Metal particles, Clustering, Electrophoresis, Living colloids, Palladium, Films.
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