A5078971415- Aluminum Alloys Composites Properties
- Boron and Carbon Nanomaterials Research
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Lubricants and Their Additives
- Metal and Thin Film Mechanics
- High-Temperature Coating Behaviors
- Graphene research and applications
- Materials Engineering and Processing
- Tribology and Wear Analysis
- Advanced Combustion Engine Technologies
- Force Microscopy Techniques and Applications
- 3D Printing in Biomedical Research
- Bone Tissue Engineering Materials
- Biodiesel Production and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Magnesium Alloys: Properties and Applications
- Tissue Engineering and Regenerative Medicine
- Supercapacitor Materials and Fabrication
- Electrospun Nanofibers in Biomedical Applications
- Electromagnetic wave absorption materials
- Multiferroics and related materials
- Advanced Surface Polishing Techniques
- Thermal properties of materials
- Orthopaedic implants and arthroplasty
Florida International University
2016-2024
University of Pennsylvania
2021-2024
Oklahoma State University
2023
Indian Institute of Technology Delhi
2015-2019
Indian Institute of Information Technology Design and Manufacturing Jabalpur
2013-2015
Indian Institute of Petroleum
1971-1992
Polylactic acid (PLA) and graphene reinforced polylactic (PLA‐graphene) composites have been fabricated by three‐dimensional (3D) fused deposition modeling (FDM) printing. Indentation creep resistance was analyzed in terms of the strain‐rate sensitivity index PLA (0.11) PLA‐graphene (0.21). Enhanced is attributed to restriction polymeric chains graphene, caused low strain rates identified during secondary creep. The tribological properties were evaluated ball‐on‐disk wear tests. Wear...
Biomimetic on-chip tissue models serve as a powerful tool for studying human physiology and developing therapeutics; however, their modeling power is hindered by our inability to develop highly ordered functional structures in small length scales. Here, we demonstrate how high-precision fabrication can enable scaled-down of organ-level cardiac mechanical function. We use two-photon direct laser writing (TPDLW) fabricate nanoscale-resolution metamaterial scaffold with fine-tuned properties...
Three-dimensional (3D) macroporous graphene foam based multifunctional epoxy composites are developed in this study. Facile dip-coating and mold-casting techniques employed to engineer microstructures with tailorable thermal, mechanical, electrical properties. These processing allow capillarity-induced equilibrium filling of branches, creating epoxy/graphene interfaces minimal separation. Addition 2 wt % enhances the glass transition temperature from 106 162 °C, improving thermal stability...
Abstract Morphological and chemical transformations in boron nitride nanotubes under high temperature atmospheric conditions is probed this study. We report oxygen induced cleavage of at temperatures exceeding 750 °C for the first time. Unzipping then followed by coalescence these densely clustered multiple uncurled ribbons to form stacks 2D sheets. FTIR EDS analysis suggest platelets be Boron Nitride Oxide platelets, with analogous structure Graphene therefore we term them as “White Oxide”...
Graphene foam‐based hierarchical polyimide composites with nanoengineered interface are fabricated in this study. Damping behavior of graphene foam is probed for the first time. Multiscale mechanisms contribute to highly impressive damping foam. Rippling, spring‐like interlayer van der Waals interactions and flexing branches believed be responsible at intrinsic, anatomical scales, respectively. Merely 1.5 wt% addition matrix leads as high ≈300% improvement loss tangent. nanoplatelets...
Ultra‐long Boron Nitride Nanotubes (100–200 µm) based layered Al–BNNT–Al composites are fabricated by spark plasma sintering, followed cold rolling. The BNNT mat is sputter coated with Al to engineer strong metal‐nanotube interface. BNNTs exhibit perfect alignment along the rolling direction. tensile strength of composite found be 200 MPa, which 400% greater than pure (≈40 MPa). Young's modulus this sandwich (≈134 GPa) double (≈70 (with standard deviations less 10%). Strengthening explained...
Boron Nitride Nanotube (BNNT) is a promising reinforcement for developing strong and lightweight metal matrix composites due to its brilliant mechanical properties excellent high‐temperature oxidation resistance. In this study, layered of aluminum BNNT are fabricated by multi‐step process comprising hot pressing, rolling, annealing. Less than 0.1 wt% ultra‐long nanotubes (up 200 μm in length) used induce superior strengthening. For achieving enhanced properties, de‐agglomerated chemically...
The mechanism of metal transfer was investigated in twist-compression experiments with 6061-T6 aluminum specimens rotating against hardened steel anvils. Mineral oils 4.5, 30 and 284 mm2/s viscosity at 38 C were used neat fatty acids, alcohols, P CI EP additives. Even though the initial squeeze films disappeared, sooner light oil later heavier oil, limited retransfer gave a steady-state friction value 0.2. heaviest maintained fluid film 0.03 restricted to thin patchy coating valleys lapped...
Abstract Stable dispersion of boron nitride nanotube (BNNT) in a solvent is critical challenge that has restricted the development potential applications. In this study, stable BNNT aqueous dispersions are obtained by direct tip sonication water without any surfactant and organic solvent. BNNTs functionalized with hydroxyl groups (OH) as result sonication‐assisted hydrolysis. The energy from results disentanglement as‐received clusters partial B‐N bond cleavage to unzip nanotubes. Using...
Boron Nitride Nanotubes (BNNTs), a 1D nanomaterial with extraordinary mechanical properties, are structurally like carbon nanotubes. BNNTs possess superior thermal stability of ∼900 °C, higher resistance to oxidation at elevated temperatures, and enhanced neutron shielding capacity. These benefits open wider processing window for manufacturing BNNT-reinforced metal matrix composites (MMC) hold promise several structural applications, including radiation shielding. This critique presents the...
Abstract The protection of steel surfaces from wear under extreme pressure conditions is major importance in several industries as it provides better performance and longer life machinery. motivation for this work was to study the lubrication by ionic liquids (ILs), which have recently emerged greener alternatives commercial lubricants additives. Three ILs based on sulfur-containing anions, used 2-wt% additives polyethylene glycol base oil (MW 200; PEG 200), were tested ASTM 52100 bearing...
Boron nitride nanotube (BNNT) is an attractive load-bearing nanomaterial with excellent mechanical properties and high-temperature stability. In this study, the mechanics of BNNT buckypaper assembly examined at elevated temperatures (up to 750 °C). situ investigations are performed inside electron microscope for real-time visualization deformation. The deformation characteristics multiple hierarchical levels understand role defects in a single nanotube, stress-transfer between entangled...
Herein, boron nitride nanotube (BNNT)–reinforced Ti alloy composites with 1 wt% BNNT (3 vol%) are successfully fabricated by spark plasma sintering (SPS). This study addresses two challenges affecting the performance of BNNT–metal matrix composites: i) dispersion high‐surface‐energy BNNTs an ultrasonic‐assisted technique and ii) control reactions at metal/nanotube interface. High‐energy ultrasonic vibrations were effective in entangled BNNTs, low (750 °C 555 MPa) high (950 60 temperature...