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Full-Text Articles in Engineering Science and Materials

Liquid Metal-Elastomer Soft Composites With Independently Controllable And Highly Tunable Droplet Size And Volume Loading, Ravi Tutika, Steven Kmiec, A. B. M. Tahidul Haque, Steve W. Martin, Michael D. Bartlett Jan 2019

Liquid Metal-Elastomer Soft Composites With Independently Controllable And Highly Tunable Droplet Size And Volume Loading, Ravi Tutika, Steven Kmiec, A. B. M. Tahidul Haque, Steve W. Martin, Michael D. Bartlett

Materials Science and Engineering Publications

Soft composites are critical for soft and flexible materials in energy harvesting, actuators, and multifunctional devices. One emerging approach to create multifunctional composites is through the incorporation of liquid metal (LM) droplets such as eutectic gallium indium (EGaIn) in highly deformable elastomers. The microstructure of such systems is critical to their performance, however, current materials lack control of particle size at diverse volume loadings. Here, we present a fabrication approach to create liquid metal-elastomer composites with independently controllable and highly tunable droplet size (100 nm ≦ D ≦ 80 μm) and volume loading (0 ≦ φ ≦ 80%). This is achieved through a combination ...


Effects Of Microstructure And Crystallography On Mechanical Properties Of Cold-Rolled Sae1078 Pearlitic Steel, Y. Liu, C. D. Yang, M. Liu, C. H. Wang, Y. C. Dai, X. Li, Alan M. Russell, C. X. Zhang, Z. H. Zhang, G. H. Cao Jan 2018

Effects Of Microstructure And Crystallography On Mechanical Properties Of Cold-Rolled Sae1078 Pearlitic Steel, Y. Liu, C. D. Yang, M. Liu, C. H. Wang, Y. C. Dai, X. Li, Alan M. Russell, C. X. Zhang, Z. H. Zhang, G. H. Cao

Materials Science and Engineering Publications

The evolution of the microstructure and crystallography in SAE1078 pearlitic steel sheets under different cold-rolling reductions of up to 90% were quantified using transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The mechanical properties were determined by tensile testing at room temperature. TEM analysis showed that the pearlite structure was obviously refined with the interlamellar spacing decreasing to about 57 nm at the rolling reduction of 90%. EBSD investigations indicated that the ferrite exhibited a {001}texture in the 90% cold-rolled pearlitic steel. The dislocations were mainly concentrated during cold rolling between the 10% and 70 ...


Tem Study Of The Martensitic Phases In The Ductile Dycu And Ycu Intermetallic Compounds, G. H. Cao, C.-G. Oertel, R. Schaarschuch, W. Skrotzki, Alan M. Russell Jun 2017

Tem Study Of The Martensitic Phases In The Ductile Dycu And Ycu Intermetallic Compounds, G. H. Cao, C.-G. Oertel, R. Schaarschuch, W. Skrotzki, Alan M. Russell

Materials Science and Engineering Publications

DyCu and YCu are representatives of the family of CsCI-type B2 rare earth intermetallic compounds that exhibit high room temperature ductility. Structure, orientation relationship, and morphology of the martensites in the equiatomic compounds DyCu and YCu are examined using transmission electron microscopy (TEM). TEM studies show that the martensite structures in DyCu and YCu alloys are virtually identical. The martensite is of orthorhombic CrB-type B33 structure with lattice parameters a = 0.38 nm, b = 1.22 nm, and c = 0.40 nm. (02 (1) over bar) twins were observed in the B33 DyCu and YCu martensites. The orientation relationship of ...


Bottom-Up Approach To Fabricate Nanostructured Thin Films From Colloidal Nanocrystal Precursors, Santosh Shaw Jan 2017

Bottom-Up Approach To Fabricate Nanostructured Thin Films From Colloidal Nanocrystal Precursors, Santosh Shaw

Graduate Theses and Dissertations

Control over microstructures at the nanoscale (<100nm) still seems challenging due to, among other things, the stochastic nature of nucleation in the bulk phase. The densification of assemblies of ligand-capped nanocrystals (colloidal nanocrystal assemblies, CNAs) could bypass this challenge that limits our control over the nanostructure and, therefore, the properties of materials. However, the removal of the ligands and the cracking that follows it are the two critical hurdles that have been stymieing this approach.

We show that low-pressure plasma processing can effectively remove ligands from CNAs (down to 0.6 at.% of carbon which can be accounted for adventitious carbon) without harming the properties of the inorganic cores of the nanoparticles and the structure of CNAs. The cracking of CNAs is correlated with the structure of the CNAs, which can be controlled and easily predicted by Hansen solubility parameters of solvent in which the nanoparticles are dispersed. While a fully solvated ligand shell leads to the formation of close-packed ordered CNAs – which cracked after self-assembly or ligand removal ...