Resume

• 2010

  Master's degree

  Theoretical and Applied Mechanics

  University of Illinois at Urbana-Champaign

• Bangladesh Women In Technology (BWIT)

  Athletics

  Characterization

  Research

  Matlab

  LabVIEW

  Machine Learning

  Computer Science

  Mathematica

  AFM

  Algorithms

  Materials Science

  Nanotechnology

  Fortran

  C

  Numerical Analysis

  Scanning Electron Microscopy

  Mathematical Modeling

  C++

  Simulations

  ANSYS

  Effect of short and long CNT Bundle on Polymer Composites

  Effect of short and long CNT Bundle on Polymer Composites

  Nanoindentation and nanoscratch experiments were performed on thin multilayer films manufactured using the layer-by-layer (LbL) assembly technique. These films are known to exhibit high gas barrier

  but little is known about their durability

  which is an important feature for various packaging applications (e.g.

  food and electronics). Films were prepared from bilayer and quadlayer sequences

  with varying thickness and composition. In an effort to evaluate multilayer thin film surface and mechanical properties

  and their resistance to failure and wear

  a comprehensive range of experiments were conducted: low and high load indentation

  low and high load scratch. Some of the thin films were found to have exceptional mechanical behavior and exhibit excellent scratch resistance. Specifically

  nanobrick wall structures

  comprising montmorillonite (MMT) clay and polyethylenimine (PEI) bilayers

  are the most durable coatings. PEI/MMT films exhibit high hardness

  large elastic modulus

  high elastic recovery

  low friction

  low scratch depth

  and a smooth surface. When combined with the low oxygen permeability and high optical transmission of these thin films

  these excellent mechanical properties make them good candidates for hard coating surface-sensitive substrates

  where polymers are required to sustain long-term surface aesthetics and quality.

  Scratch resistance of multilayer films for gas barrier and separation

  A molecularly thin lubricant layer (of the order of 1–2 nm thick) has been shown to provide bearing forces at the interface between contacting solid surfaces under light loads and high shear rates. This phenomenon is important

  for example

  in the head-disk contact in magnetic storage hard disk drives to ensure that some of the contact is sustained by the lubricant layer and thus avoiding damage of the solid surfaces. The magnitude of the normal and tangential bearing forces that the lubricant layer can provide depends on temperature

  viscosity of the lubricant

  sliding velocity and radius of gyration of the lubricant molecules. This study shows that viscosity has the greatest effect on the load bearing capacity of the molecularly thin lubricant. Thus

  by controlling the flash temperature and the ratio of molecularly thin lubricant-to-bulk viscosity

  the bearing load carrying capacity of the layer can be controlled. This would allow for the contact to be sustained within the mobile lubricant layer

  avoiding solid contact so as to protect the diamond-like carbon coating

  and thus reduce wear and potential catastrophic failures.

  Optimization of molecularly thin lubricant to improve bearing capacity at the head-disk interface

  Nanocrystalline HfB2

  HfBN and multilayer HfB2/HfBN films were deposited using chemical vapor deposition. Half of the amorphous as-deposited films were subjected to annealing at 700 °C to obtain their annealed equivalent samples. Nanoindentation and nanoscratch experiments were performed to measure their mechanical properties

  friction and scratch/wear behavior. The annealed films showed higher hardness values compared to the as-deposited films

  with the HfB2 film exhibiting the highest hardness. All three films exhibited similar shear strength around 3 GPa for as-deposited and 5.5 GPa for annealed films

  implying reduced delamination propensity for the annealed samples. The annealed HfBN and multilayer HfB2/HfBN films exhibited lower friction and wear

  compared to the rest of the films. Specifically

  the annealed multilayer HfB2/HfBN films

  exhibited an order of magnitude lower wear

  compared to the HfB2 films

  making them excellent candidates for low friction and low wear hard coating applications.

  Nano-tribological behavior of Hafnium Boride thin films

  Shahla

  Chowdhury

  University of Illinois at Urbana-Champaign

  Thermo King

  Bangladesh University of Engineering and Technology

  Texas A&M University

  University of Minnesota-Twin Cities

  Florida Atlantic University

  Urbana-Champaign

  Illinois Area

  Nano Tribology

  Graduate Research Assistant

  University of Illinois at Urbana-Champaign

  Greater Minneapolis-St. Paul Area

  Adjunct Faculty

  Mechanical/ Aerospace Engineering and Mechanics

  University of Minnesota-Twin Cities

  Bryan/College Station

  Texas Area

  Research Associate and Instructor

  Department of Mechanical Egnineering

  Texas A&M University

  Bloomington

  MN

  Engineering Modeling and Simulation

  Thermo King

  Dhaka

  Bangladesh

  Consultanting Engineer and Lecturer

  Bangladesh University of Engineering and Technology

  Composite design for Naval ships (ONR Project)

  Florida Atlantic University

  Bengali