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Full-Text Articles in Engineering

Neutron Diffraction Study Of Multiferroic 0.6nife2o4/0.4batio3 Composite, Engkir Sukirman, Yosef Sarwanto, Syahfandi Ahda, Andon Insani Dec 2019

Neutron Diffraction Study Of Multiferroic 0.6nife2o4/0.4batio3 Composite, Engkir Sukirman, Yosef Sarwanto, Syahfandi Ahda, Andon Insani

Makara Journal of Technology

Neutron diffraction study on the 0.6NiFe2O4/0.4BaTiO3 multiferroic composite has been carried out. The 0.6NiFe2O4/0.4BaTiO3 multiferroic composites have been synthesized by solid reaction method. In this study, 20 g of BaTiO3 (BTO) and 20 g of NiFe2O4 (NFO) compounds were prepared from the powder raw materials of BaO3 and TiO2 for BTO, and NiO and Fe2O3 for NFO. Furthermore, both BTO and NFO were each crushed for 5 hours using High Energy Milling (HEM). Then the BTO and NFO were calcined in the furnace at 950 °C/5 hours and 900 °C/5 hours, respectively ...


Follow-Up And Kinetic Model Selection Of Dinitro Pentamethylene Tetramine (Dpt), Hany A. Elazab Dr Jun 2019

Follow-Up And Kinetic Model Selection Of Dinitro Pentamethylene Tetramine (Dpt), Hany A. Elazab Dr

Chemical Engineering

The Synthetic route of Cyclotetramethylene Tetramine is implemented through the reaction of hexamine and nitrating mixture that is formed as a result of a reaction between ammonium nitrate and fuming nitric acid. The reaction medium includes acetic acid, acetic anhydride and p-formaldehyde. This synthetic pathway is relatively long and both of hexamine dinitrate and Dinitro Pentamethylene Tetramine (DPT) are considered as the two main intermediate compounds. The former compound (hexamine dinitrate) was prepared, purified, and then characterized. Conversion of hexamine dinitrate into DPT has been followed up experimentally at different temperatures. Various factors including temperature and time has been investigated ...


Evaluating The Scalability Of The Sonication Method Of Graphene Oxide Synthesis, Evan Dexter May 2019

Evaluating The Scalability Of The Sonication Method Of Graphene Oxide Synthesis, Evan Dexter

Honors Program Projects

Graphene is a new material that was first isolated in 2004, and consists of one to a few atomic layers of carbon in a lattice sheet structure. Graphene has high tensile strength, high surface area, very low electrical resistance, and various other special properties that make it an excellent material for use in emerging technologies in the categories of electrical components, energy systems, and high strength applications. The production scale of graphene sheets and its variations is currently limited to laboratory use, with increasing research being conducted toward the development of manufacturing techniques of the material. We conducted experiments to ...


Solution Phase Synthesis Of Lead-Free Perovskite And Perovskite-Inspired Materials, Rainie Dean Nelson Jan 2019

Solution Phase Synthesis Of Lead-Free Perovskite And Perovskite-Inspired Materials, Rainie Dean Nelson

Graduate Theses and Dissertations

This dissertation is a broad overview of research in the field of lead-free perovskite

inspired materials. While lead halide perovskites have promising properties, we sought to

investigate non-toxic alternatives – typically ones containing bismuth halides. We looked

into the flexibility of this element to be produced on different length scales, fabricating films

from bulk material, synthesizing nanocrystals, and growing crystals of 2D layered double

perovskites. We discovered that due to complexation with a solvent, bismuth iodide films can

be morphology controlled through use of solvent additives. During our synthesis of Cs3Bi2X9

nanocrystals, we found that BiX3 precursors possessed photoluminescence and that ...