13th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing: Sustainable Manufacturing of Ceramics
Sponsored by: ACerS Engineering Ceramics Division
Program Organizers: Surojit Gupta, University of North Dakota; Rajiv Asthana, University of Wisconsin; Hisayuki Suematsu, Nagaoka University of Technology; Mritunjay Singh, Ohio Aerospace Institute; Enrico Bernardo, University of Padova; Yiquan Wu, Alfred University; Zhengyi Fu, Wuhan University of Technology; Allen Apblett, Oklahoma State University; Tatsuki Ohji, National Institute of Advanced Industrial Science and Technology

Monday 8:00 AM
October 18, 2021
Room: A212
Location: Greater Columbus Convention Center

Session Chair: Allen Apblett, Oklahoma State University; Luca Masi, Ansys Inc.

8:00 AM
The Use of Waste Materials for the Manufacture of Ceramic Water Filters in Marginalized Communities: Ian Nettleship¹; Chuyuan Zheng¹; ¹University of Pittsburgh
    Low-cost ceramic water filters are manufactured in small-scale factories using locally sourced ceramic raw materials and agricultural waste materials as porogens. Unfortunately, this material technology has not scaled to the magnitude of the need, in part due limited understanding of the action of the porogen and variability of locally sourced raw materials. Simple hydraulic conductivity measurements and 3D micro-CT imaging can be used to understand the role of the porogens in producing the pore structure in the ceramic. The effect of porogen size and volume fraction on hydraulic conductivity will be presented.

8:20 AM  Invited
Single Source Precursors for Lanthanum Phosphates: Allen Apblett¹; Mha Albqmi¹; ¹Oklahoma State University
    The rich diversity of compounds in the La2O3/P2O5 system has led to numerous applications. Lanthanum phosphates suitably doped with other metal ions possess useful optical properties leading to their application in lasers, phosphors, and luminescent materials. When exposed to water vapor, several lanthanum phosphates become proton conductors that can be used in fuel cells and hydrogen separators. Lanthanum phosphate films are hydrophobic and are inert and non-wettable by molten metals and molten salts, leading to applications as coatings that prevent hot corrosion. It was found that reaction of lanthanum salts of bis-2-ethylhexylphosphate or appropriate mixtures of bis-2-ethylhexylphosphate and 2-ethylhexanoate could be used to produce single-source precursors for LaPO4, La2P4O13, and LaP3O9. The organic groups are removed readily by heating in air above 300˚C to form amorphous lanthanum phosphate glasses that crystalize as the target compounds at higher temperature, with exception of the metastable La2P4O13 that phase-separates into LaPO4 and LaP3O9.

8:50 AM
Bandgap Engineering of Epitaxial ā-(AlxGa1-x)2O3 Films Grown via the Spin-coating Method: Iva Milisavljevic¹; Yiquan Wu¹; ¹Alfred University
    A wide bandgap β-Ga2O3 is a material of great chemical and physical stability and numerous applications. It has been demonstrated that alloying β-Ga2O3 with Al enables further increase of bandgap energy (Eg) and opens up new possibilities for its use in ultra-high-power electronics and ultra-short wavelength optoelectronics. A sol-gel route was used for the preparation of β-(AlxGa1-x)2O3 films that were spun-coated onto the (0001) sapphire substrates. A comprehensive analysis of structural and optical properties revealed a notable change in crystalline and optical properties of the films resulting from the incorporation of Al into the Ga2O3 matrix. The obtained results demonstrated a great potential of spin-coating method for the growth of good quality (AlxGa1-x)2O3 epitaxial films with tunable bandgap energy.

9:10 AM
Development of Energy Efficient Solid-state Material Processing Technologies for Sustainable Manufacturing: Kumar Kandasamy¹; ¹Enabled Engineering
    Conventionally, alloys and composite materials are made using ladle metallurgy where the different alloying elements and reinforcement phase are added into the liquid melt in the form of pure elements and phases, or as master alloys. On the other hand, solid-state processing is done via ball milling and severe plastic deformation processes. The current methods are energy intensive processes, or time consuming and has scalability issues due to inherent process difficulties. The SolidStir is a novel solid-state technology that enables continuous severe plastic deformation, microstructure modification, solid-state alloying, composite material manufacturing and solid-state recycling. This technology is highly energy efficient compared the conventional manufacturing processes. The main reason for improved energy efficiency is the application of energy at the point need which avoids the energy loss to the environment and axillary processing systems. In this presentation, energy efficiency and environmental impact of SolidStir technology will be discussed with an example.

9:30 AM
Green Method for Preparation of Inorganic Green Pigments: Allen Apblett¹; Travis Reed¹; ¹Oklahoma State University
    Inorganic pigments can be superior to organic pigments with respect to resistance to oxidative deterioration, fading when exposed to sunlight, and, in some cases, toxicity. It was discovered in this investigation that green pigments could be prepared by the pyrolysis of low-temperature single source precursors. The latter were prepared by precipitation of a solid solution of mixed zinc and cobalt salts of 2-oximinopropionate containing 5 to 10% of cobalt versus zinc. These complexes decompose at low temperature in the solid state to produce fine powders of metal oxides with the simultaneous release of acetonitrile, carbon dioxide, and water. The cobalt-doped zinc oxide produced in this matter is a dark green in color. Beyond use as a pigment, this material can also be applied as a bactericidal agent to control water borne bacterial pathogens and as a photocatalyst for the degradation of methylene blue dye in aqueous medium.