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Nanotechnology

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Displaying 201 - 225 of 912

Determining what really counts: Modeling and measuring nanoparticle number concentrations

August 1, 2019
Author(s)
Elijah J. Petersen, Antonio R. Montoro Bustos, Blaza Toman, Monique E. Johnson, Mark Ellefson, George C. Caceres, Anna Lena Neuer, Qilin Chan, Jonathan Kemling, Brian Mader, Karen E. Murphy, Matthias Roesslein
Elijah J. Petersen, Antonio Montoro Bustos, Blaza Toman, Monique Johnson, Mark Ellefson, George C. Caceres, Anna Lena Neuer, Qilin Chan, Jonathan Kemling, Brian Mader, Karen Murphy, Matthias Roesslein

High Resolution Physical Characterization of Single Metallic Nanoparticles

June 28, 2019
Author(s)
Jessica Ettedgui, Jacob Forstater, Joseph W. Robertson, John J. Kasianowicz
Discrete metal oxygen clusters, polyoxometalates (POMs), can be detected at the single molecule limit, using a biological nanopore-based electronic platform. The method provides a complementary approach to traditional analytical chemistry tools utilized in

The Art in Science of MicroTAS 2018

June 21, 2019
Author(s)
Gregory A. Cooksey
The 2018 MicroTAS conference (the 22nd International Conference of Miniaturized Systems for Chemistry and Life Sciences) took us to Kaohsiung, Taiwan, for an inspiring mix of science and culture. The Art in Science competition, sponsored by Lab on a Chip

Single-scan acquisition of multiple multidimensional spectra

May 29, 2019
Author(s)
Travis M. Autry, Galan Moody, James M. Fraser, Corey A. McDonald, Richard P. Mirin, Kevin L. Silverman
Multidimensional coherent spectroscopy is a powerful tool for understanding the ultrafast dynamics of complex quantum systems. To fully characterize the nonlinear optical response of a system, multiple pulse sequences must be recorded and quantitatively

Structural Insights into DNA-Stabilized Silver Clusters

May 10, 2019
Author(s)
Danielle Schultz, Robert G. Brinson, Fahriye N. Sari, Jeffrey Fagan, Christina Bergonzo, Nancy Lin, Joy Dunkers
The structure and dynamics of Ag complexes derived from single stranded DNA (ssDNA) is less understood than their double stranded (dsDNA) counterparts despite their great promise as fluorescent biological probes and sensors. In this work, we seek new

Layer-by-Layer Thinning of MoS2 via Laser Irradiation

April 17, 2019
Author(s)
Bien Cuong Tran Khac, Ryan White, Frank W. DelRio, Koo-hyun Chung
Layer-by-layer thinning of molybdenum disulfide (MoS2) via laser irradiation was examined using Raman spectroscopy and atomic force microscopy. In particular, the effects of number of layers, laser conditions, and substrate were systematically identified

ELECTRON ENERGY-LOSS SPECTROSCOPY AND IMAGING

March 12, 2019
Author(s)
Vladimir P. Oleshko
This article describes electron energy-loss spectroscopy (EELS), energy-filtering transmission electron microscopy (EFTEM) and electron spectroscopic diffraction (ESD) in a transmission electron microscope (TEM) or in a scanning transmission electron

Label-Free Detection of Conformational Changes in Switchable DNA Nanostructures with Microwave Microfluidics

March 12, 2019
Author(s)
Angela C. Stelson, Minghui Lu, Charles A. Little, Christian J. Long, Nathan D. Orloff, Nicolas Stephanopolous, James C. Booth
Detection of conformational changes in biomolecular assemblies provides critical information into biological and self-assembly processes. State-of-the-art in situ conformation detection techniques rely on fluorescent labels or protein-specific binding

Raman Imaging of Surface and Sub-Surface Graphene Oxide in Fiber Reinforced Polymer Nanocomposites

March 1, 2019
Author(s)
Amber D. McCreary, Qi An, Aaron M. Forster, Kunwei Liu, Siyao He, Chris Macosko, Andreas Stein, Angela R. Hight Walker
The incorporation of nanofillers, such as graphene oxide (GO) into fiber reinforced polymer composites to improve their mechanical properties is a significant research area for a variety of industrial applications. However, to date there is no reliable

NIST Nanotechnology Environmental, Health, and Safety Research Program: 20092016

November 27, 2018
Author(s)
Debra L. Kaiser, Vincent A. Hackley
In response to needs of a government-wide initiative in nanotechnology led by a subcommittee within the White House’s Office of Science and Technology Policy, NIST established a nanotechnology environmental, health, and safety (nano-EHS) research program

Highly mechanosensitive ion channels from graphene-embedded crown ethers

November 26, 2018
Author(s)
Alta Y. Fang, Kenneth Kroenlein, Demian Riccardi, Alex Smolyanitsky
The ability to tune ionic permeation across nanoscale pores profoundly impacts diverse fields from nanofluidic computing to drug delivery. Here, we take advantage of complex formation between crown ethers and dissolved metal ions to demonstrate graphene

Effects of Consumer Use Practices on Nanosilver Release from Commercially Available Food Contact Materials

October 23, 2018
Author(s)
Susana Addo Ntim, Samuel R. Norris, David Goodwin, Jens Breffke, Keana Scott, Li Piin Sung, Treye Thomas, Gregory O. Noonan
Migration evaluation involving nano-enabled food contact materials (FCMs) mostly focus on potential nanoparticle release from new unused products. This may not represent consumer use practices encountered by the FCMs in their lifecycle. In order to

Electronic Characteristics of MoSe2 and MoTe2 for Nanoelectronic Applications

October 15, 2018
Author(s)
Asha Rani, Shiqi Guo, Sergiy Krylyuk, Albert Davydov
Single-crystalline MoSe2 and MoTe2 platelets were grown by Chemical Vapor Transport (CVT), followed by exfoliation, device fabrication, optical and electrical characterization. We observed that for the field-effect-transistor (FET) channel thickness in

Nondestructive shape process monitoring of three-dimensional high aspect ratio targets using through-focus scanning optical microscopy Optical Microscopy

September 27, 2018
Author(s)
Ravikiran Attota, Hyeonggon Kang, Keana C. Scott, Richard A. Allen, Andras Vladar, Bunday Benjamin
Low-cost, high-throughput and nondestructive metrology of truly three-dimensional (3-D) targets for process control/monitoring is a critically needed enabling technology for high-volume manufacturing (HVM) of nano/micro technologies in multi-disciplinary

Approaches for the Quantitative Analysis of Oxidation State in Cerium Oxide Nanomaterials

September 21, 2018
Author(s)
Christopher M. Sims, Russell A. Maier, Aaron C. Johnston-Peck, Justin M. Gorham, Vincent A. Hackley, Bryant C. Nelson
Cerium oxide nanomaterials (nanoceria, CNMs) are receiving increased attention from the research community due to their unique chemical properties, most prominent of which is their ability to alternate between the Ce3+ and Ce4+ oxidation states. While many
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