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Nanotechnology

Nanochemistry

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Displaying 51 - 75 of 95

Versatile fluidic cell for in-situ electrochemical measurements in SEM

July 24, 2016
Author(s)
Jeyavel Velmurugan, Ana Stevanovic, Feng Yi, David A. LaVan, Andrei Kolmakov
Electrochemical techniques such as like electrodeposition are crucially important for fabrication of nanostructured materials. The details of cluster nucleation and growth at early stages of electrodeposition are extremely important for morphology and

Recent approaches for bridging the pressure gap in photoelectron microspectroscopy

January 29, 2016
Author(s)
Andrei A. Kolmakov, Luca Gregoratti, Maya Kiskinova, Sebastian Gunther
Ambient pressure photoelectron spectroscopy (APPES) and microscopy are at the frontier of modern chemical analysis at liquid-gas, solid-liquid and solid-gas interfaces, bridging science and engineering of functional materials. Complementing the current

Nucleobase-functionalized graphene nanoribbons for accurate high-speed DNA sequencing

December 23, 2015
Author(s)
Eugene Paulechka, Tsjerk A. Wassenaar, Kenneth Kroenlein, Andrei Kazakov, Alexander Smolyanitsky
We propose a water-immersed nucleobase-functionalized suspended graphene nanoribbon as an intrinsically selective device for nucleotide detection. The proposed sensing method combines Watson–Crick selective base pairing with graphene's capacity for

Charge transfer stabilization of late transition metal oxide nano-particles on a layered niobate support

December 10, 2015
Author(s)
Megan E. Strayer, Thomas Senftle, Jonathan P. Winterstein, Nella M. Vargas-Barbosa, Renu Sharma, Robert M. Rioux, Michael J. Janik, Thomas Mallouk
The interfacial interactions between late transition metal/metal oxide nanoparticles and oxide supports impact catalysts' activity and stability. Here, we report the use of isothermal titration calorimetry (ITC), electron microscopy and density functional

Elemental characterization of Single-Wall Carbon Nanotube (SWCNT-1) reference material by neutron and prompt gamma activation analysis

April 7, 2015
Author(s)
Rick L. Paul, Rabia Oflaz, Jan Kucera, J W Bennett, E. A. De Nadai Fernandes, M. Kubesova, M. A. Bacchi, A. J. Stopic, R. E. Sturgeon, P. Grinberg
Instrumental neutron activation analysis with both relative and k0 standardization was used in four experienced laboratories to determine element mass fractions in single-wall carbon nanotube certified reference material (CRM) SWCNT-1. Results obtained

Temperature-dependent structure of Tb-doped magnetite nanoparticles

February 13, 2015
Author(s)
Katherine P. Rice, Stephen E. Russek, Roy H. Geiss, Justin Shaw, Robert J. Usselman, Eric R. Evarts, Thomas J. Silva, Hans Nembach, Elke Arenholz, Yves U. Idzerda
High quality 5 nm cubic Tb-doped magnetite nanoparticles have been synthesized by a modified wet-chemical method to investigate tailoring of magnetic properties for imaging and biomedical applications. We show that the Tb is incorporated into the

N-methylmesoporphyrin IX fluorescence as a reporter of strand orientation in guanine quadruplexes

April 1, 2014
Author(s)
Navin C. Sabharwal, Victoria Savikhin, Joshua Turek-Herman, John M. Nicoludis, Veronika Szalai, Liliya Yatsunyk
Guanine quadruplexes (GQ) are four-stranded DNA structures formed by guanine-rich DNA sequences. Formation of GQs inhibits cancer cell survival, but detecting GQs in vivo has proved difficult, in part because of GQ structural diversity. Development of GQ

Controlled Formation and Characterization of Dithiothreitol-Conjugated Gold Nanoparticle Clusters

March 5, 2014
Author(s)
De-Hao D. Tsai, Tae Joon Cho, Frank W. DelRio, Justin Gorham, Jiwen Zheng, Jiaojie Tan, Michael R. Zachariah, Vincent A. Hackley
We report a systematic study of the controlled formation of discrete-size gold nanoparticle clusters (GNCs) by interaction with the reducing agent dithiothreitol (DTT). Asymmetric-flow field flow fractionation and electrospray differential mobility

Designing High-Performance PbS and PbSe Nanocrystal Electronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic Layer Deposition

February 6, 2014
Author(s)
Soong Ju Oh, Nathaniel E. Berry, Hi-Hyuk Choi, E. A. Gaulding, Hangfei Lin, Taejong Paik, Benjamin T. Diroll, Shinichiro Muramoto, Murray B. Christopher, Cherie R. Kagan
We report a facile, solution based, post synthetic colloidal atomic layer deposition (PS-cALD) process to engineer the surface stoichiometry and therefore electronic properties of lead chalcogenide nanocrystal (NC) thin films. Using the stepwise and

The Art in Science of microTAS (Editorial)

March 12, 2013
Author(s)
Michael Gaitan
The discovery of a natural phenomenon unveils a curtain of ignorance from what has always existed. However, the creation of art requires the use of materials and knowledge combined with artistic inspiration to create a work of aesthetic appeal. By this

Temperature sculpting in yoctoliter volumes

February 14, 2013
Author(s)
Joseph E. Reiner, Joseph W. Robertson, Daniel L. Burden, Lisa K. Burden, Arvind Balijepalli, John J. Kasianowicz
The ability to perturb large ensembles of molecules from equilibrium led to major advances in understanding reaction mechanisms in chemistry and biology. Here, we demonstrate the ability to control, measure, and make use of rapid temperature changes of

Size-Dependent Structural Distortions

January 7, 2013
Author(s)
Michael D. Anderson, Colby L. Heideman, Qiyin Lin, Mary Smeller, Robert S. Kokenyesi, Andrew Herzing, Ian M. Anderson, Douglas A. Keszler, Paul Zschack, David C. Johnson
Recently we reported that intergrowth compounds [(MSe)1+y]m(TSe2)n, with M = Pb, Bi Ce} and T = W, Nb, Ta} self assemble from designed precursors. The values of m and n represent, respectively, the number of MSe and TSe2 structural units of the unit cell

Chemically Modifiable Fluorinated Copolymer Nanoparticles for 19F MRI Contrast Enhancement

December 27, 2012
Author(s)
Jessica L. Staymates, Mark M. Bailey, Steven R. Kline, Michael D. Anderson, Cory Berkland
Recently there has been interest in developing imaging contrast media for magnetic resonance imaging (MRI) that contain biologically rare, magnetically active nuclei such as fluorine. In principle, fluorinated contrast agents can be used to generate highly

Effect of Tin Doping on alpha-Fe2O3 Photoanodes for Water Splitting

June 28, 2012
Author(s)
Christopher C. Bohn, Amit Agrawal, Erich C. Walter, Mark D. Vaudin, Andrew Herzing, Paul M. Haney, Albert A. Talin, Veronika Szalai
Sputtered-deposited films of α-Fe2O3 of thickness 600 nm were investigated as photoanodes for solar water splitting and found to have photocurrents as high as 0.8 mA/cm2 at 1.23 V vs. the reversible hydrogen electrode (RHE). The incorporation of Sn into

Photo-induced Surface Transformation of Silica Nanocomposites

June 22, 2012
Author(s)
Justin M. Gorham, Tinh Nguyen, Coralie Bernard, Deborah S. Jacobs, Richard D. Holbrook
The physicochemical, UV-induced surface modifications to silica nanoparticle (SiNP) - epoxy composites have been investigated. The silica nanocomposites (SiNCs) were prepared using a two-part epoxy system with 10 % mass fraction of SiNPs and exposed to
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