M. Ramanujam

Bio: M. Ramanujam is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Grinding. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Effects of grinding aids vibration milling of aluminum

Abstract: Fine aluminum powder is widely used in making paints, printing inks, slurry explosives, pyrotechnic chemicals etc. Hence the production of aluminum powder is highly important. In this paper the effect of grinding aids on the grinding characteristics of aluminum in a vibration mill under an inert atmosphere of nitrogen has been investigated. It is found that the use of grinding aids is essential in grinding of atomized aluminum. Among four different grinding aids, stearic acid appears to be the best grinding aid.

Overviews of Synthesis of Nanomaterials

Abstract: In this chapter, authors discuss two preparation methods to precisely control the materials structure and elemental composition. These methods are classified into a “top-down” and “bottom-up” fabrication process. In “bottom-up” synthesis, the material is constructed from atom or molecules to the cluster until the designed shape is achieved, akin to building a house from bricks (simply saying from small to big). In the “top-down” synthesis, the corresponding material is reconstructed or deformed, ablated to form different structures, akin to a sculptor chiseling a block of marble to create a statute of definite shape and size.

Synthesis of nanomaterials using top-down methods

Abstract: Nanomaterial synthesis procedures that are scalable, cheap, and green are not common. Several synthesis strategies are discussed with a focus on top-down syntheses. Here, ball milling for nanoalloys, composites, grains, and semicrystalline materials is discussed. The mechanical alloying processes are used to generate amorphous and crystalline alloys as well as metal and nonmetal nanocomposites by doping, metal insertion, and co-alloying are also discussed. The nonequilibrium processes whereby alloying is achieved are discussed in the thermodynamics of mixing different elemental powders, milling types, and inert atmosphere to generate stable mixed powder materials with the same composition stoichiometrically required. Under higher energies, deformation and fracture of the materials occur, and these deformations define particle shape and porosity. Cold-welding approaches also lead to material fracture and smaller powders for different alloying particles in grain-refined matrices. The application of mechanical milling of different alumina materials can lead to the synthesis of a wide variety of materials for specific applications, which can be further modified using postannealing or activation processes to generate activated materials. This chapter reviews the basic concepts, energetics, and considerations of synthesis of different nanomaterials for catalysis and energy applications.