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Dielectric/Piezoelectric Materials

Looking for a Postdoctoral Position

Looking for postdoctoral position. My current postdoc contract at National University of Singapore will be terminated in the end of August, 2016. I have quite good experience in the following areas during my PhD and current postdoc career.

Areas: Dielectric elastomer, Smart Polymer, Energy harvesting using EAPs, Soft Actuation, Hydrogels/conducting polymers, Polymer nanocomposites, Dielectric/Piezoelectric materials.

 

Amir Abdollahi's picture

Fracture toughening and toughness asymmetry induced by flexoelectricity

Cracks generate the largest strain gradients that any material can withstand. Flexoelectricity (coupling between strain gradient and polarization) must therefore play an important role in fracture physics. Here we use a self-consistent continuum model to evidence two consequences of flexoelectricity in fracture: the resistance to fracture increases as structural size decreases, and it becomes asymmetric with respect to the sign of polarization. The latter phenomenon manifests itself in a range of intermediate sizes where piezo- and flexoelectricity compete.

Amir Abdollahi's picture

A computational study of flexoelectricity

Flexoelectricity is a size-dependent electromechanical mechanism coupling polarization and strain gradient. It exists in a wide variety of materials, and is most noticeable for nanoscale objects, where strain gradients are higher. Simulations are important to understand flexoelectricity because experiments at very small scales are difficult, and analytical solutions are scarce.

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