Modeling the Mechanical Properties of Germanium Nanowire Aerogel
Germanium nanowire aerogel provides a wide range of applications such as dynamic filtering materials. The mechanical properties of these aerogels depend on the physical and chemical interactions between the wires that can be a function of the deformation. In this study, we have used the beam theory to characterize the mechanical properties of the two-dimensional non-interacting germanium nanowire networks under tension, compression, simple shear, and pure shear deformations. These networks were prepared both in regular and randomly oriented wires with different number density. Our results demonstrate that the effective shear and Young modulus of regular and random networks follow scaling laws with respect to a characteristic length of the network (Lc), which is defined as the area of the network divided by the length of a wire. Specifically, the effective Young modulus (Eeff.) follows Eeff~Lc-1 and the effective shear modulus (Geff.) shows Geff~Lc-3 scaling behaviors. Furthermore, our analysis of networks generated with random orientations of wires indicates that the statistical parameters of the network, such as average wire orientation, segment length, and the number of segments, can affect the mechanical properties of the network.
Rheology of soft particle glasses
Soft particle pastes have been used in food and cosmetics processing, surface coating, construction, and drilling industry. Depending on the timescale of a given process, these systems can show solid-like and liquid-like behaviors. Previously in our group, a three-dimensional micromechanical model for the soft particle pastes was developed. In this research, we aim to understand the effect of attractive forces between the deformable particles on the rheological properties of these systems by developing a new model that includes attractive interactions between the particles.
Developing Models and Simulations of Magnetically-Driven Flows of Dilute Suspensions of Magnetite Particles
Ischemic strokes, which are caused by blockage of blood flow due to the blood clots, are one the most common types of strokes. The ischemic stroke causes the shortage of oxygen to the brain due to the thrombus (blood clot). Due to the bleeding complications, which are caused by increasing the plasmin in the body, the usage of large doses of thrombolytic is not possible.
In the case of a fully occluded artery, the drug is only transferred for a short distance into the blocked vessel by convection mechanism, and transport of the drug to longer length scale is diffusion-limited. In this study, we aim to model and simulate the drug delivery to a fully occluded blood vessel using a magneto-rheological fluid that is caused by a rotary magnetic field with a gradient.
- Rheology and dynamics of complex fluids and mechanics of solids
- Theory, modeling, and simulations of granular flows
- Computational fluid dynamics
- Fallah, F.; Khabaz, F.; Kim Y-R, Kommidi; S. R. and Haghshenas, H.; “Molecular Dynamics Modeling and Simulation of Asphalt Binder Chemical Aging Due to Variation of Oxidation Level and Saturate-Aromatic-Resin-Asphaltene Fraction”, Fuel, 237, 71-80, 2018.
- Liu, T.; Khabaz, F.; Cloitre, M. and Bonnecaze, R. T.; “The Universality of the Flow Curve for Soft-Particle Glasses”, Soft Matter, 14, 7064-7074 (2018).
- Khabaz, F. and Khare, R.; “Temperature Dependence of Rheological Properties of Asphalt: Application of Time-Temperature-Superposition Principle”, J. Rheol., 62, 941, 2018.
- Khabaz, F.; Cloitre, M. and Bonnecaze, R. T.; “Structural State Diagram of Concentrated Suspensions of Jammed Soft Particles in Oscillatory Shear Flow”, Phys. Rev. Fluids, 3, 033301, 2018.
- Khabaz, F.; Zhang, Y.; Xue, L.; Quitevis E. J.; Maginn E. J.; and Khare, R.; “Temperature Dependence of Volumetric and Dynamic Properties of Imidazolium-Based Ionic Liquids”, J. Phys. Chem. B, 122 (8), 2414-2424, 2018.
- Khabaz, F.; Liu, T.; Cloitre, M. and Bonnecaze, R. T.; “Shear-Induced Crystallization in Jammed Soft Particle Glasses”, Phys. Rev. Fluids, 2, 93301, 2017.
- Godbole, R.; Khabaz, F.; Khare, R.; and Hedden, R., “Extension of Flory-Rehner Theory to Multi Component Polymer Network Solvent Systems”, J. Phys. Chem. B, 121 (33), 7963-7977, 2017.
- Habib, T.; Sundaravadivelu Devarajan, D.; Khabaz, F.; Parviz, D.; Achee, T.; Khare, R. and Green, M. J., “Co-solvents as Liquid Surfactants for Boron Nitride Nanosheet (BNNS) Dispersions”, Langmuir, 32 (44), 11591-11599, 2016.
- Khabaz, F.; Mani, S. and Khare, R., “Molecular Origins of Dynamic Coupling between Water and Hydrated Polyacrylate Gels”, Macromolecules, 49 (19), 7551-7562, 2016.
- Mani, S.; Khabaz, F.; Godbole, R. V.; Hedden, R. C. and Khare, R., “Structure and Hydrogen Bonding of Water in Polyacrylate Gels: Effects of Polymer Hydrophilicity and Water Concentration”, J. Phys. Chem. B, 119 (49), 15381-15393, 2015.
- Zhang, Y.; Xue, L.; Khabaz, F.; Doerfler, R; Khare, R; Quitevis, E. L. and Maginn, E. J., “Molecular Topology and Local Dynamics Govern the Viscosity of Imidazolium-Based Ionic Liquids”, J. Phys. Chem. B, 119 (47), 14934-14944, 2015.
- Khabaz, F. and Khare, R., “Glass Transition and Molecular Mobility in Styrene-Butadiene Rubber Modified Asphalt”, J. Phys. Chem. B, 119 (44), 14261-14269, 2015.
- Bari, R.; Parviz, D; Khabaz, F.; Klaassen, C. D.; Metzler, S. D; Hansen, M. J.; Khare, R. and Green, M. J., “Liquid Phase Exfoliation and Crumpling of Inorganic Nanosheets”, Phys. Chem. Chem. Phys., 17 (14), 938, 2015.
- Khabaz, F. and Khare, R., “Effect of Chain Architecture on the Size, Shape, and Intrinsic Viscosity of Chains in Polymer Solutions: A Molecular Simulation Study”, J. Chem. Phys., 141 (21), 21409, 2014.
- Khare, K. S.; Khabaz, F. and Khare, R., “Effect of Carbon Nanotube Functionalization on Mechanical and Thermal Properties of Cross-linked Epoxy-Carbon Nanotube Nanocomposites: Role of Strengthening the Interfacial Interactions”, ACS Appl. Mater. Interfaces, 6 (9), 6098-6110, 2014.
- Khabaz, F.; Khare, K. S. and Khare, R., “Temperature Dependence of Creep Compliance of Highly Cross-linked Epoxy: A Molecular Simulation Study”, TIMES OF POLYMERS (TOP) AND COMPOSITES 2014, Book Series: AIP Conference Proceedings, 1599, 262-265, 2014.