ChangKyu Yoon wil present on Wednesday, September 24, 2014, as part of DMSE’s Graduate Research Seminar series. ChangKyu is a graduate student researcher in the lab of Dr. David Gracias. Please find below the title and abstract of the lecture that ChangKyu will present.
Functional stimuli responsive hydrogel devices by self-folding
We describe a photolithographic approach to create functional stimuli responsive, self-folding, microscale hydrogel devices using thin, gradient cross-linked hinges and thick, fully cross-linked panels. The hydrogels are composed of poly (N-isopropylacrylamide-co-acrylic acid) (pNIPAM-AAc) with reversible stimuli responsive properties just below physiological temperatures. We show that a variety of three dimensional (3D) structures can be formed and reversibly actuated by heat or pH. We experimentally characterized the swelling and mechanical properties of pNIPAM-AAc and developed a finite element model to rationalize self-folding and its variation with hinge thickness and swelling ratio. Finally, we highlight applications of this approach in the creation of functional devices such as self-folding polymeric microcapsules, untethered micro-grippers and thermally steered micro-mirror systems.
Susanna Thon, Assistant Professor in the Dept. of Electrical & Computer Engineering at Johns Hopkins University, will present on Wednesday, September 24, 2014, as part of DMSE’s fall seminar series. Her lecture is titled “Nanocrystal Photovoltaics.“
The next generation of photovoltaics seeks to push the boundaries of both efficiency and cost-effectiveness through the use of flexible platforms and new materials. Solution-processed technologies, such as hybrid organic-inorganic perovskites and semiconductor nanocrystals, offer an attractive route towards achieving these goals. Additionally, these materials are uniquely suited to benefit from photonic and optical engineering of their structures and properties. For example, the bandgap of inorganic nanocrystal films can be tuned via the quantum confinement effect for tailored spectral utilization, and nanophotonic light trapping techniques can be seamlessly integrated into devices employing both organic and inorganic materials. I will review recent progress in solution-processed solar materials technology with a focus on colloidal quantum dot photovoltaics.
For more information, contact Dr. Jonah Erlebacher.
The Don P. Giddens Inaugural Professorial Lecture series continues on Tuesday, Oct. 14 when Hai-Quan Mao, professor in the Department of Materials Science and Engineering, presents “Designer Materials for Tissue and Therapeutic Engineering” from 3 to 5 p.m. in Gilman Hall 50. In his lecture, Mao chronicles several case studies about recent innovations in the development of polymeric nanomaterials to enhance stem cell expansion and differentiation and to improve gene medicine delivery.