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Search Publications by: Renu Sharma (Assoc)

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Displaying 26 - 50 of 71

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

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

Nanocatalyst shape and composition during nucleation of single-walled carbon nanotubes

December 7, 2015
Author(s)
Jose Gomez-Ballesteros, Juan Burgos, Pin A. Lin, Renu Sharma, Perla Balbuena
The dynamic evolution of nanocatalyst particle shape and carbon composition is examined through the initial stages of the single walled-carbon nanotubes chemical vapor deposition synthesis via classical reactive and ab initio molecular dynamics simulations

Creating Nanostructured Superconductors by Local Current Annealing

September 17, 2015
Author(s)
Hongwoo H. Baek, Jeonghoon Ha, Duming Zhang, Bharath NMN Natarajan, Jonathan P. Winterstein, Renu Sharma, Rongwei Hu, Kefeng Wang, Steven Ziemak, Johnpierre Paglione, Young Kuk, Nikolai B. Zhitenev, Joseph A. Stroscio
Superconductivity results from a Bose condensate of Cooper-paired electrons with a macroscopic quantum wavefunction. Dramatic effects can occur when the region of the condensate is shaped and confined to the nanometer scale. Recent progress in

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

Direct evidence of active and inactive phases of Fe catalyst nanoparticles for carbon nanotube formation

November 1, 2014
Author(s)
Stefano Mazzuccoo, Ying Wang, Mihaela M. Tanase, Matthieu C. Picher, Kai Li, Zhijian WU, Stephan Irle, Renu Sharma
Iron and carbon interactions play an important role in various industrial processes such as steel manufacturing, liquid fuel the production by Fischer Tropsch process and carbon nanotube synthesis by chemical vapor deposition process. Interestingly, iron

Nucleation of Graphene and Its Conversion to Single Walled Carbon Nanotube

October 20, 2014
Author(s)
Matthieu C. Picher, Pin A. Lin, Gomez-Ballesteros L. Jose, Perla Balbuena, Renu Sharma
Nucleation is a critical stage for controlling the molecular building blocks into desired functional crystalline structures. For example, chirality of a single-walled carbon nanotube is determined at nucleation stage when the growing graphene sheet wraps

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

Twin Plane Re-entrant Mechanism for Catalytic Nanowire Growth

March 12, 2014
Author(s)
Andrew D. Gamalski, Peter W. Voorhees, Renu Sharma, Caterina Ducati, Stephan Hofmann
We observe a twin plane re-entrant based growth mechanism for Au catalyzed Ge nanowire growth using video-rate lattice-resolved environmental transmission electron microscopy. For a [112] growth direction, we find a convex, V-shaped liquid catalyst

Impact of UV Irradiation on the Surface Chemistry and Structure of Multiwall Carbon Nanotube Epoxy Nanocomposites

December 6, 2013
Author(s)
Elijah Petersen, Thomas F. Lam, Justin Gorham, Keana Scott, Chris Long, Deborah Jacobs, Renu Sharma, James Alexander Liddle, Tinh Nguyen
One of the most promising applications of nanomaterials is as nanofillers to enhance the properties of polymeric materials. However, the effect of nanofillers on polymers subject to typical environmental stresses, such as ultraviolet (UV) radiation, high

Metastable Crystalline AuGe Catalysts Formed During Isothermal Germanium Nanowire Growth

June 19, 2012
Author(s)
Andrew D. Gamalski, Jerry Tersoff, Renu Sharma, Caterina Ducati, Stephan Hofmann
We observe the formation of metastable AuGe phases without quenching, during strictly isothermal nucleation and growth of Ge nanowires, using video-rate lattice-resolved environmental transmission electron microscopy. We explain the unexpected formation of