Characterization of Minerals, Metals and Materials 2022: Characterization of Polymers, Composites, Coatings and Ceramics
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee
Program Organizers: Mingming Zhang, Baowu Ouyeel Co. Ltd; Jian Li, CanmetMATERIALS; Bowen Li, Michigan Technological University; Sergio Monteiro, Instituto Militar de Engenharia; Shadia Ikhmayies; Yunus Kalay, Middle East Technical University; Jiann-Yang Hwang, Michigan Technological University; Juan Escobedo-Diaz, University of New South Wales; John Carpenter, Los Alamos National Laboratory; Andrew Brown, Devcom Arl Army Research Office; Rajiv Soman, Eurofins EAG Materials Science LLC; Zhiwei Peng, Central South University
Tuesday 2:30 PM
March 1, 2022
Room: 207B
Location: Anaheim Convention Center
Session Chair: Wendell Bruno Almeida Bezerra, University of California San Diego; Sheron Tavares, University of California San Diego
2:30 PM Introductory Comments
2:35 PM
Cobalt Ferrite Based Multiferroic Polymer Nanocomposites: Alix Martin1; 1Tuskegee
This work investigates ferromagnetic and dielectric materials with an emphasis on cobalt, nickel, iron, PVDF and P(VDF-TrFE). Cobalt ferrite is synthesized using the sonochemical method. These nanoparticles are then infused into the PVDF polymer and its co polymer P(VDF-TrFE) to fabricate 100 micrometers thick, thin films. First is the synthetization of magnetic nanoparticles, specifically cobalt ferrite nanoparticles using bottom-up approach via ultrasonication method at 50nm diameter or less. Secondly, use the as-synthesized nanoparticles to determine if they could fill the hole gaps in a polymer matrix, then prepare a composite film using the doctor blading technique to test their coupling effect. The synthesized cobalt ferrite nanoparticles at 300K showed higher coercivity than the nickel ferrite nanoparticles. The size of the magnetic particle determined its energy in an external field. This relation is essentially through the number of magnetic molecules in an individual magnetic domain.
2:55 PM
Understanding 3D Volumetric Analysis of Active MOF Embedded in Thin Film Polymer: Andy Holwell1; Maadhav Kothari1; Markus Boese1; Simon Vo2; Russell Morris2; Alexander Forse3; Suzi Pugh3; 1Carl Zeiss Microscopy Llc; 2University of St Andrews; 3University of Cambridge
Metal organic frameworks (MOFs) are a structurally tuneable class of hierarchical porous materials with a wide range of host-guest chemistry. MOFs are incredibly difficult to structurally characterise using typical scanning electron microscopy methods. Beam stability, along with non-conductive nature and porous framework result in multiple problems for nanoimaging and structural milling. We demonstrate novel imaging and 3D volumetric chemical analysis techniques using MOF-74 type analogue for carbon capture and mixed membrane composite CPO-27-Ni. Using imaging strategies that include high resolution variable pressure microscopy with optimised beam path lengths and charge reduction, we demonstrate superior imaging at low vacuum, improving imaging quality and eliminating sample charging. We also employ a cryogenically cooled in situ stage to undertake 3D volumetric analysis of a MOF composite membrane in conjunction with EDS. Thus, we show a new methodology for volumetric analysis of MOF composites and optimal imaging using low pressure, low kV electron microscopy.
3:15 PM
Employing a Semi-quantitative System to Elucidate Particle Spacing in Particle-reinforced Composite: Andrew O'Connor1; Cheol Park1; Michele Manuel1; 1University of Florida
Particle spacing can significantly affect the mechanical and particle-dependent properties of particle-reinforced composites. Concepts such as particle dispersion and distribution express the relative adequacy of particle spacing; however, there exists no agreement in the literature on the best parameterization of these values. Additionally, the typical characterization techniques using optical or electron microscopy of cross-sections necessitate stereological arguments, which are often inconsistently applied. Here is presented a system built on three different methods of quantifying particle spacing: nearest-neighbor distance, interparticle distance, and free space distance. To assist interpretation of these varied particle spacing metrics, cross-section(s) of analyzed composites with descriptive captions are presented to complete this semi-quantitative characterization system. As an example, this system is applied to reveal the effect of changing volume fractions and fabrication techniques in a particular composite system.
3:35 PM
Interfacial Investigation of High Loaded Plastic Bonded Explosive Interfaces Modified via
Biologically Inspired Core-shell Coating Technique. LA-UR-21-26026: Matthew Herman1; Erik Watkins1; John Yeager1; 1Los Alamos National Laboratory
Plastic-bonded explosives (PBX) are polymer matrix composites that are highly loaded with micron-scale explosive crystals. A limiting mechanical factor in a PBX is the interface between the polymer binder and the explosive. Synthetic dopamine, capable of undergoing self-polymerization and becoming polydopamine (PDA), has been demonstrated to form controllable nanometer thickness films which are capable of promoting the adhesion between the filler and binder. These films form a core-shell architecture consisting of a rigid polymer shell over the substrate. PDA film structure and growth must be understood before it can be applied in general use with high explosive (HE) materials. Neutron reflectometry, performed on the Asterix beamline at the Los Alamos Neutron Science Center, has been employed to demonstrate the controllable nature of PDA film growth and the film’s structure. Thin film composite stack-ups of inert crystal, PDA, and binder system were investigated to determine the nature of the various interfaces.
3:55 PM Break
4:10 PM
Evaluation of the Puzolanic Effect of Microsilice
on Physical and Mechanical Properties in Mortar Mixtures
: Elisa Alcala de Villarroel1; Inocente Villarroel1; 1UNEG
The objective of this work was to evaluate the mechanical, physical and microstructural properties of the puzolean effect of Microsilica in Mortar Mixtures.The chemical analysis was carried out, Mechanical-physical and microstructural cement and microsilica, obtaining that this puzolana are composed mainly of amorphous silica, Microsilica, 94.8 %, which reacts with calcium hydroxide, providing cement properties to mortar mixtures. At the same time this puzolana has a high efficiency to decrease the alkaline reactivity of aggregates, Microsylice, 94.6 % Four mortar mixtures were developed, one standard mixture without puzolanas and three mixtures with substitution of 5, 7, and 9% by weight of cement by Microsylice, all mixtures used by Microsilica managed to maintain the mechanical resistances obtained in the Psylice mixture. Noting the best behavior for the MS 5% mixture, the results also indicate that this puzolana decreases the permeability of concrete to Ion chloride.
4:30 PM
Ubim Fiber: Another Possible Reinforcement in Composites: Belayne Marchi1; Wendell Bezerra1; Michelle Oliveira1; Talita de Sousa1; Veronica Candido2; Alisson Silva2; Sergio Monteiro1; 1Instituto Militar de Engenharia; 2Universidade Federal do Pará
The use of natural fibers as reinforcement in polymer composites replacing synthetic fibers has been growing in the last decades in different industrial sectors. These fibers are of great environmental importance, as they are biodegradable, low cost and found in abundance in nature, as is the case of ubim fiber (Geonoma baculifera), a species from the Amazon region. The use of ubim fiber represents an ecologically correct option for reinforcing polymeric matrices, such as in epoxy resin, for example. In the present work, the ubim fiber, was for the first time physically characterized by X-ray diffraction (XRD). Fiber density was statistically analyzed by the Weibull method, using both the geometric method and the Archimedes’ technique. The microstructure of the ubim fiber were characterized by scanning electron microscopy. The preliminary results indicate a promising application of ubim fiber as reinforcement of composite material.