Block copolymers based optically transparent super-hydrophobic coating

Presenter: 

Karim Gadelrab

Authors: 

Karim Gadelrab, Mukarram Tahir, Yi Ding, Li-Chen Cheng, Caroline Ross, and Alfredo Alexander-Katz

Author Affiliation: 

Department of Materials Science and Engineering, MIT

Abstract: 

The self-assembly of nanostructures is a bottom-up approach that enables utilizing nanoscale properties in real life applications, Given the thermodynamic nature of the process, the self-assembly process requires minimal intervention during fabrication to cost-effectively produce large scale structures. In this work, the microphase separation of block copolymers BCPs is utilized to generate intricate topographies on glass substrates. A true multiscale structure is formed by multi-stacking cylinder forming PS-b-PDMS BCP with different molecular weights, The inherent in-plane orientation of every layer of cylinders is determined naturally based on equilibrium spacing ratios and interracial energies, ensuring macroscale ordering. The multiscale nature, and nanoscale features produce a transparent superhydrophobic coating with minimal force of adhesion . The simplicity of the process and the stability of the topography allow it to be implemented to a diverse set of applications: wind shields, eye glasses, and solar panels.