Accession Number : ADA617947


Title :   Homogeneous Media Milling: Reactant-Assisted Mechanochemical Synthesis of Functionalized Nanoparticles from Malleable and Ductile Metals


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA AEROSPACE SYSTEMS DIRECTORATE


Personal Author(s) : McMahon, Brandon W ; Perez, Jesus P ; Yu, Jiang ; Boatz, Jerry A ; Anderson, Scott L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a617947.pdf


Report Date : Jan 2014


Pagination or Media Count : 45


Abstract : A reactant-assisted mechanochemical method was used to produce copious nanoparticles from malleable/ductile metals, demonstrated here for aluminum, iron, and copper. Homogeneous Media Milling (HMM) generates metal nanoparticles via a reactant-accelerated wear process, where the reactant aids particle production by binding to the metal surfaces, enhancing particle production, and reducing the tendency toward mechanochemical (cold) welding. The mechanism is explored by comparing the effects of different types of solvents and solvent mixtures on the amount and type of particles produced. Particles were functionalized with oleic acid to aid in particle size separation, enhance dispersion in hydrocarbon solvents, and protect the particles from oxidation. For aluminum and iron, the result is air-stable particles, but for copper, the suspended particles are found to dissolve when exposed to air. Characterization was performed using electron microscopy, dynamic light scattering, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Density functional theory was used to examine the nature of carboxylic acid binding to the aluminum surface, confirming the dominance of bridging bidentate binding.


Descriptors :   *CHEMICAL MILLING , *METALS , ALUMINUM , CUTTING , DENSITY FUNCTIONAL THEORY , DISPERSING , DISPERSIONS , DUCTILITY , DYNAMICS , ELECTRON MICROSCOPY , FOURIER TRANSFORMATION , HOMOGENEITY , HYDROCARBONS , INFRARED SPECTROSCOPY , LIGANDS , LIGHT SCATTERING , LOW TEMPERATURE , MEDIA , MIXTURES , OLEIC ACID , PARTICLES , PRODUCTION , REACTANTS(CHEMISTRY) , REPRINTS , SEPARATION , SOLVENTS , SURFACES , X RAY PHOTOELECTRON SPECTROSCOPY


Subject Categories : Industrial Chemistry and Chemical Processing


Distribution Statement : APPROVED FOR PUBLIC RELEASE