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Displaying 751 - 775 of 1856

Reliability Monitoring For Highly Leaky Devices

May 31, 2013
Author(s)
Jason T. Ryan, Jason P. Campbell, Kin P. Cheung, John S. Suehle, Richard Southwick, Anthony Oates
We demonstrate a new charge pumping (CP) methodology, frequency modulated CP (FMCP), that robustly treats metrology challenges associated with high gate leakage current. By moving to an AC coupled measurement, we are able to easily resolve small CP signals

Toward the Development of a High Strain Rate Testing Standard for Advanced Fibers

May 24, 2013
Author(s)
Gale A. Holmes, Jae Hyun Kim, Nathanael A. Heckert, Walter G. McDonough, Stefan D. Leigh, Kirk D. Rice
The use of advanced fibers in applications where they are subjected to extremely energetic events has necessitated the need to develop measurement tools that quantify their properties at high strain rates (HSR). The split Hopkinson tension bar (SHTB) has

Effects of fiber gripping methods on single fiber tensile tests: Parametric statistical analyses of tensile strengths and failure strains

May 9, 2013
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Walter G. McDonough, Kirk D. Rice, Gale A. Holmes
The Kolsky bar test has been widely used in measuring material response under high strain rate conditions. Initial experiments in the literature applying this test to measure single fiber properties for fibers used in soft body armor with the Kolsky bar

Effect of Surface Chemistry on Stem Cell Response in 2-D vs. 3-D Cell Culture Niches

April 19, 2013
Author(s)
Sumona Sarkar, Carl G. Simon Jr., Roberta I. Lock, Joy P. Dunkers
To develop tissue engineered devices for regenerative medicine strategies, key scaffold properties for directing stem cell response must be identified. As focus shifts from 2-D to 3-D culture systems in an attempt to better recapitulate the natural

Graphene as Transparent Electrode for Direct Observation of Hole Photoemission from Silicon to Oxide

March 27, 2013
Author(s)
Rusen Yan, Qin Zhang, Oleg A. Kirillov, Wei Li, James I. Basham, Alexander G. Boosalis, Xuelei X. Liang, Debdeep Jena, Curt A. Richter, Alan C. Seabaugh, David J. Gundlach, Huili G. Xing, Nhan V. Nguyen
The outstanding electrical and optical properties of graphene make it an excellent alternative as a transparent electrode. Here we demonstrate the application of graphene as collector material in internal photoemission (IPE) spectroscopy; enabling the

Polymer chain dynamics in weakly intercalated polymer/nanoplatelet mixtures

March 15, 2013
Author(s)
Kevin A. Masser, Hongyi Yuan, Chad R. Snyder, Alamgir Karim
The dynamics of two chemically similar type-A polymers, poly(epsilon-caprolactone) (PCL) and poly(lactic acid) (PLA) with small amounts of Cloisite 30B nanoplatelets were investigated via broadband dielectric relaxation spectroscopy. The terminal

Gradient Nanofiber Scaffold Libraries for Screening Cell Response to Poly(e-caprolactone)-Calcium Phosphate Composites

March 1, 2013
Author(s)
Carl G. Simon Jr., Limin Sun, Laurence C. Chow, William Miles, Christopher K. Tison, Kaushik Chatterjee, Marian F. Young, Vinoy Thomas, Murugan Ramalingam
A 2-spinnerette approach has been developed for fabricating nanofiber scaffold gradients for use as 1) scaffold libraries for screening the effect of nanofiber properties on cell response and 2) templates for generating graded tissue interfaces. Although

Frequency-Modulated Charge Pumping: Defect Measurements with High Gate Leakage

February 28, 2013
Author(s)
Jason T. Ryan, Richard G. Southwick, Jason P. Campbell, Kin P. Cheung, John S. Suehle, Anthony Oates
Charge pumping is one of the most relied upon techniques used to quantify interface defects in metal-oxide-semiconductor devices. However, conventional charge pumping is easily hindered by excessive gate leakage currents which render the technique

Organosilicate Polymer E-Beam Resists with High Resolution, Sensitivity and Stability

February 28, 2013
Author(s)
Christopher Soles, Richard Kasica, Hae-Jeong Lee, Jae H. Sim, Sung-Il Lee, Ki-Bum Kim, Hyun-Mi Kim, Do Y. Yoon
Hydrogen silsesquioxane (HSQ) is an attractive electron-beam (e-beam) resist for sub-20 nm lithography due to its high resolution, excellent line-edge-roughness (LER), and good plasma etch resistance. However, the sensitivity and long-term stability of HSQ

Effects of fiber gripping methods on the single fiber tensile test: I. Non parametric statistical analysis

February 15, 2013
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Kirk D. Rice, Gale A. Holmes
Single fiber tensile tests using two different gripping methods were carried out on various fiber lengths. One method (the glue-tab grip) consists of mounting a fiber onto a rigid tab as specified in ASTM C1557-03 using an adhesive, while the other (the

Salt-Specific Effects in Aqueous Dispersions of Carbon Nanotubes

February 13, 2013
Author(s)
Jeffrey A. Fagan, Carlos A. Silvera Batista, Alberto Striolo, Naga Rajesh Tummala, Manaswee Suttipong
Tremendous progress has been made to stabilize carbon nanotube dispersions using surfactants, although many questions await answer to design surfactant formulations that selectively stabilize nanotubes mono-dispersed in diameter and chirality. Stimulated

Spontaneous wrinkling in azlactone-based functional polymer thin films in 2d and 3d geometries for guided nanopatterning

February 4, 2013
Author(s)
Muruganathan Ramanathan, Bradley S. Lokitz, Jamie M. Messman, Christopher Stafford, S. M. Kilbey
We report a simple, one step process for developing wrinkling patterns in azlactone-based polymer thin films and brushes in 2D and 3D surfaces. The polymer used in this work wrinkles spontaneously upon deposition and solidification on a substrate without

Effects of dual antibacterial agents MDPB and nano-silver in primer on microcosm biofilm, cytotoxicity and dentin bond properties

February 1, 2013
Author(s)
Ke Zhang, Lei Cheng, Satoshi Imazato, Joseph M. Antonucci, Nancy Lin, Sheng Lin-Gibson, Yuxing Bai, Hockin H. Xu
Objectives: Secondary caries at restoration margins is the main reason for restoration failure. Antibacterial bonding agents are promising to inhibit biofilm acids at the tooth-restoration interfaces. The objective of this study was to investigate the
Displaying 751 - 775 of 1856