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Graduate Student Seminar - 10/02/2015

"Immobilization and Encapsulation of Micro- and Nano-Objects with Electron Transparent Graphene Oxide Membranes"

by Alexander Yulaev

Friday, October 2, 2015 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor: Assistant Professor Marina Leite

We report on a new drop casting technique for facile and gentle encapsulation of micro and nano objects at arbitrary substrates by electron (photon) transparent graphene oxide membranes. The encapsulation is based on a droplet formation around the encapsulated object and relies on the effect of facile water permeability through the surface segregated quasi-2D network of graphene oxide microflakes. The process of encapsulation was studied using a set of model objects and micro-structured surfaces such as nanowires, inorganic droplets, micro-bubbles, pollen, and micro-organisms. Two specific regimes of encapsulation, such as wrapping and isolating, can be realized via controlling the hydrophobicity of the substrates. Several specific phenomena, such as object compression, primary and secondary encapsulation were observed. Finally, the electron microscopy and analysis of the encapsulated objects, image contrast formation mechanism, beam broadening, and attenuation are discussed. The technique can find an application in forensic science, histology, and environmental remediation.

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