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Search Publications by: James Alexander Liddle (Fed)

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Displaying 26 - 50 of 75

The Nanolithography Toolbox

October 19, 2016
Author(s)
Krishna Coimbatore Balram, Daron Westly, Marcelo I. Davanco, Karen E. Grutter, Qing Li, Thomas Michels, Christopher H. Ray, Richard Kasica, Christopher B. Wallin, Ian J. Gilbert, Brian A. Bryce, Gregory Simelgor, Juraj Topolancik, Nicolae Lobontiu, Yuxiang Liu, Pavel Neuzil, Vojtech Svatos, Kristen A. Dill, Neal A. Bertrand, Meredith Metzler, Gerald Lopez, David Czaplewski, Leonidas Ocola, Kartik Srinivasan, Samuel Stavis, Vladimir Aksyuk, James Alexander Liddle, Slava Krylov, Robert Ilic
This article describes a platform-independent software package for scripted lithography pattern layout generation and complex processing. The Nanolithography Toolbox, developed at the Center for Nanoscale Science and Technology (CNST) at the National

Giant surface conductivity enhancement in a carbon nanotube composite by ultraviolet light exposure

July 29, 2016
Author(s)
Christian J. Long, Nathan D. Orloff, Kevin A. Twedt, Thomas F. Lam, Luis Fernando Vargas Lara, Minhua Zhao, Bharath NMN Natarajan, Keana C. Scott, Eric Marksz, Tinh Nguyen, Jack F. Douglas, Jabez J. McClelland, Edward J. Garboczi, Jan Obrzut, James A. Liddle
Carbon nanotube composites are lightweight, multifunctional materials with readily adjustable mechanical and electrical properties—relevant to the aerospace, automotive, and sporting goods industries as high-performance building materials. Here, we combine

Cure temperature influences electrical properties via carbon nanotube-rich domain formation

July 27, 2016
Author(s)
Chelsea S. Davis, Nathan D. Orloff, Jeremiah W. Woodcock, Christian J. Long, Kevin A. Twedt, Bharath NMN Natarajan, Jonathan E. Seppala, Jabez J. McClelland, Jan Obrzut, James A. Liddle, Jeffrey W. Gilman
Carbon nanotube (CNT) nanocomposites are enticing materials that enable engineers to tailor structural and electrical properties for applications in the automotive and aerospace industries. CNT mass fraction and the matrix cure temperature are two ways to

Durability of Carbon Nanotube Polymer-Fiber Composites

July 25, 2016
Author(s)
Aaron M. Forster, James Alexander Liddle, Donald L. Hunston, Ajay Krishnamurthy
Significant composite strength improvements have been achieved using highly aligned and dense carbon nanotube fibers with low resin concentration, but these remain ac-cessible only to aerospace applications [1]. The potential of carbon nanotubes for high

Multiscale Metrologies for Process Optimization of Carbon Nanotube Polymer Composites

July 18, 2016
Author(s)
Bharath N. Natarajan, Nate Orloff, Rana N. Ashkar, Sagar Doshi, Kevin A. Twedt, Ajay Krishnamurthy, Chelsea S. Davis, Aaron M. Forster, Erik Thostenson, Jan Obrzut, Renu Sharma, James Alexander Liddle
Carbon nanotube (CNT) polymer composites are materials with attractive multifunctional properties that are becoming used in a growing range of commercial applications. With the increasing demand for these materials, it is imperative to develop methods for

Optical Fluorescence Microscopy for Spatially Characterizing Electron Transfer across a Solid-Liquid Interface on Heterogeneous Electrodes

April 28, 2016
Author(s)
Eric A. Choudhary, Jeyavel Velmurugan, James M. Marr, James A. Liddle, Veronika A. Szalai
Heterogeneous catalytic materials and electrodes are used for (electro)chemical transformations, including those important for energy storage and utilization. Due to the heterogeneous nature of these materials, activity measurements with sufficient spatial

A trade-off between the mechanical strength and microwave electrical properties of functionalized and irradiated carbon nanotube sheets

April 4, 2016
Author(s)
Tiffany S. Williams, Nate Orloff, James S. Baker, Sandi G. Miller, Bharath N. Natarajan, Jan Obrzut, Linda S. McCorkle, Marisabel Lebron-Colon, James Gaier, Michael A. Meador, James Alexander Liddle
Carbon nanotube sheets are novel implementation of carbon nanotubes that enable the tailoring of electrical and mechanical properties for applications in the automotive and aerospace industries. Small molecule functionalization and/or post-processing

Optical Tracking of Nanoscale Particles in Microscale Environments

March 10, 2016
Author(s)
Pramod Mathai, James A. Liddle, Samuel M. Stavis
The trajectories of nanoscale particles through microscale environments record useful information about both the particles and the environments. Optical microscopes provide efficient access to this information through measurements of light in the far field

Multifocus microscopy with precise color multi-phase diffractive optics applied in functional neuronal imaging

March 1, 2016
Author(s)
Sara Abrahamsson, Robert Ilic, Jan Wisniewski, Brian Mehl, Liya Yu, Lei Chen, Marcelo I. Davanco, Laura Oudjedi, Jean Bernard Fiche, Bassam Hajj, Xin Jin, Joan Pulupa, Christine Cho, Mustafa Mir, Mohamed El Beheiry, Xavier Darzacq, Marcelo Nollmann, Maxime Dahan, Carl Wu, Timothee Lionnett, James Alexander Liddle, Cornelia Bargmann
Multifocus microscopy (MFM) allows high-resolution instantaneous three-dimensional (3D) imaging and has been applied to study biological specimens ranging from single molecules inside cell nuclei to entire embryos. In any live microscopy application

Nanomanufacturing: a perspective

February 10, 2016
Author(s)
James A. Liddle, Gregg M. Gallatin
Nanomanufacturing, the scalable and economically-sustainable mass production of nanomaterials and devices, represents the tangible outcome of the nanotechnology revolution. Nanomanufacturing processes, in contrast to those used in nanofabrication for

High-Resolution Imaging and Spectroscopy at High Pressure: A Novel Liquid Cell for the Transmission Electron Microscope

December 9, 2015
Author(s)
Mihaela M. Tanase, Jonathan P. Winterstein, Renu Sharma, Vladimir A. Aksyuk, Glenn E. Holland, James A. Liddle
We demonstrate quantitative core-loss electron energy-loss spectroscopy of iron oxide nanoparticles and imaging resolution of Ag nanoparticles in liquid down to 0.24 nm, in both transmission and scanning-transmission modes, in a novel, monolithic liquid

Noncontact conductivity and dielectric measurement for high throughput roll-to-roll nanomanufacturing

November 23, 2015
Author(s)
Nathan D. Orloff, Christian J. Long, Jan Obrzut, Laurent Millaud, Francesca Mirri, Thomas R. Kole, Robert D. McMichael, Mattei Pasquali, Stephan J. Stranick, James A. Liddle
Advances in roll-to-roll processing of graphene [1] and carbon nanotube [2] have at last led to the continuous production of high-quality coatings and filaments, ushering in a wave of applications for flexible [3], [4] and wearable [5] electronics, woven

New Insights into Sequential Infiltration Synthesis

October 2, 2015
Author(s)
James Alexander Liddle, Jeffrey Elam, Mahua Biswas, Seth B. Darling, Angel Yanguas-Gil, Jonathan Emery, Alex Martinson, Paul Nealey, Tamar Segal-Peretz, Qing Peng, Jonathan P. Winterstein, Y. C. Tseng
Sequential infiltration synthesis (SIS) is a process derived from ALD in which a polymer is infused with inorganic material using sequential, self-limiting exposures to gaseous precursors. SIS can be used in lithography to harden polymer resists rendering

The evolution of carbon nanotube network structure in unidirectional nanocomposites resolved by quantitative electron tomography

June 23, 2015
Author(s)
Bharath NMN Natarajan, Noa Lachman, Thomas F. Lam, Douglas Jacobs, Christian J. Long, Minhua Zhao, Brian L. Wardle, Renu Sharma, James A. Liddle
Carbon nanotube (CNT) reinforced polymers are next-generation, high-performance, multifunctional materials with a wide array of promising applications. The successful introduction of such materials is hampered by the lack of a quantitative understanding of

Characterizing the three-dimensional structure of block copolymers via sequential infiltration synthesis and scanning transmission electron tomography

May 26, 2015
Author(s)
Tamar Segal-Peretz, Jonathan P. Winterstein, Manolis Doxastakis, Abelardo Ramirez-Hernandez, Mahua Biswas, Jiaxing Ren, Hyo S. Suh, Seth B. Darling, James Alexander Liddle, Jeffrey Elam, Juan J. de Pablo, Nestor Zaluzec, Paul Nealey
Understanding and controlling the three-dimensional structure of block copolymer (BCP) thin films is critical for utilizing these materials for sub-20 nm nanopatterning in semiconductor devices, as well as in membranes and solar cell applications

New Insights into Subsurface Imaging of Carbon Nanotubes in Polymer Composites via Scanning Electron Microscopy

February 4, 2015
Author(s)
Minhua Zhao, Bin Ming, Jae-Woo Kim, Luke J. Gibbons, Xiaohong Gu, Tinh Nguyen, Cheol Park, Peter T. Lillehei, John S. Villarrubia, Andras Vladar, James A. Liddle
Despite many studies of subsurface imaging of carbon nanotube (CNT)-polymer composites via scanning electron microscopy (SEM), significant controversy exists concerning the imaging depth and contrast mechanisms. We studied CNT-polyimide composites and, by

3D TEM Tomography of Templated Bilayer Films of Block Copolymers

December 23, 2014
Author(s)
Kevin W. Gotrik, Thomas F. Lam, Adam F. Hannon, Wubin Bai, Jonathan P. Winterstein, Alfredo Alexander-Katz, James Alexander Liddle, Caroline A. Ross
Transmission electron microscope (TEM) tomography was used to visualize the morphology and 3D connectivity of a lithographically-templated, self-assembled bilayer film of cylinder-forming 45.5 kg/mol polystyrene-block-polydimethylsiloxane. The structure

Software for Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields*

September 1, 2014
Author(s)
Nathan D. Orloff, Jan Obrzut, Christian J. Long, Thomas F. Lam, Pavel Kabos, David R. Novotny, James C. Booth, James A. Liddle
This software package was developed to analyze microwave cavity perturbation data in order to determine material dielectric properties. Example software is provided to assist with data acquisition and organization. Specifically, it is de-signed to be used

Kilohertz Rotation of Nanorods Propelled by Ultrasound, Traced by Microvortex Advection of Nanoparticles

August 26, 2014
Author(s)
Andrew L. Balk, Lamar O. Mair, Pramod Mathai, Paul N. Patrone, Wei Wang, Suzanne Ahmed, Thomas Mallouk, James A. Liddle, Samuel M. Stavis
We measure the microvortical flows around gold nanorods propelled by ultrasound in water using polystyrene nanoparticles as optical tracers. We infer the rotational frequencies of such nanomotors assuming a hydrodynamic model of this interaction. In this

Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields

July 23, 2014
Author(s)
Nathan D. Orloff, Jan Obrzut, Christian J. Long, Thomas F. Lam, James C. Booth, David R. Novotny, James A. Liddle, Pavel Kabos
The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. To

High-speed, high-purity separation of gold nanoparticle-DNA origami constructs using centrifugation

July 23, 2014
Author(s)
Seung H. Ko, Luis F. Vargas Lara, Paul Patrone, Samuel Stavis, Francis W. Starr, Jack F. Douglas, James Alexander Liddle
DNA origami is a powerful platform for assembling gold nanoparticle constructs, an important class of nanostructure with numerous applications. Such constructs are assembled by the association of complementary DNA oligomers. These association reactions

Multi-method analysis of multiwall carbon nanotube polymer nanocomposite samples after photodegradation

June 16, 2014
Author(s)
Elijah Petersen, Thomas F. Lam, Justin Gorham, Keana Scott, Chris Long, Renu Sharma, Li Piin Sung, James Alexander Liddle, Tinh Nguyen
Nanomaterials can be used as nanofillers to enhance the properties of polymeric materials. However, the effect of weathering on nanocomposites and the potential for nanomaterial release is not yet well understood. Multiple analytical methods are needed to