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Hajisaeid E.,Printed Electronics Research Collaborative | Haghzadeh M.,Printed Electronics Research Collaborative | Shone M.,Center for High Rate Nanomanufacturing | Mooney P.,Center for High Rate Nanomanufacturing | And 5 more authors.
IEEE International Symposium on Phased Array Systems and Technology | Year: 2017

In this work, we demonstrate the development of a flexible, high-dielectric-constant substrate based on barium strontium titanate (BST)/thermoplastic cyclic olefin copolymer (COC) nanocomposites suitable for fully printable phased array applications. This functionalized BST/COC substrate is demonstrated to possess tunability as a function of an applied DC bias. This tunable substrate is implemented for a tunable frequency selective surface in the X-band frequency range. © 2016 IEEE.

Hsieh S.-F.,Center for High rate Nanomanufacturing | Bello D.,Center for High rate Nanomanufacturing | Bello D.,University of Massachusetts Lowell | Schmidt D.F.,Center for High rate Nanomanufacturing | And 3 more authors.
Nanotoxicology | Year: 2012

Carbon nanotubes (CNTs) have received much attention for performance and toxicity, but vary substantially in terms of impurity type and content, morphology, and surface activity. This study determined the decrease of antioxidant capacity, defined as biological oxidative damage (BOD), of CNTs-exposed serum. The variability in several physicochemical properties of CNTs and their links to BOD elicited in human serum were explored. Tremendous variation in transition metal type and content (104-fold), specific surface area (SSA, nine-fold), and BOD were observed. Mass specific BOD (mBOD) varied from 0.006-0.187 μmol TEU mg -1, whereas surface area specific BOD (sBOD) varied from 0.068-0.42 μmol TEU m -2. The sBOD increased in a stepwise fashion from ∼0.10.32 μmol TEU m -2 for tubes with outer diameter less than 10 nm. The mBOD and sBOD may be useful denominators of surface activity and impurity content and assist in designing safer CNTs. © 2012 Informa UK, Ltd.

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