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Displaying records 11 to 20 of 71 records.
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11. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Nanomaterials
Published: 7/23/2014
Authors: Nathan D Orloff, Jan Obrzut, Christian John Long, Thomas F. Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: 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. ...

12. Effects of surface compliance and relaxation on the frictional properties of lamellar materials
Topic: Nanomaterials
Published: 6/10/2014
Authors: Alexander Y Smolyanitsky, Shuze Zhu, Zhao Z. Deng, Teng Li, Rachel J. Cannara

13. Twin Plane Re-entrant Mechanism for Catalytic Nanowire Growth
Topic: Nanomaterials
Published: 3/12/2014
Authors: Andrew D. Gamalski, Peter W. Voorhees, Renu Sharma, Caterina Ducati, Stephan Hofmann
Abstract: 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 ...

14. Laser-assisted atom probe tomography of MBE grown GaN nanowire heterostructures
Topic: Nanomaterials
Published: 2/24/2014
Authors: Norman A Sanford, Paul T Blanchard, Matthew David Brubaker, Kristine A Bertness, John B. Schlager, R Kirchofer, David R Diercks, Brian Gorman
Abstract: Laser-assisted atom probe tomography (L-APT) was performed on GaN nanowires (NWs) and axial GaN/InGaN nanowire heterostructures. All samples were grown by MBE on Si(111) substrates. The laser pulse energy (PE) at 355 nm used in L-APT analysis of Ga ...

15. Nanoscale mechanics by tomographic contact resonance atomic force microscopy
Topic: Nanomaterials
Published: 1/23/2014
Authors: Gheorghe Stan, Santiago Solares, Bede Pittenger, Natalia Erina, Chanmin Su
Abstract: We report on a quantifiable depth-dependent contact resonance AFM (CR-AFM) measurements over polystyrene-polypropylene (PS-PP) polymer blends to detail surface and sub-surface features in terms of elastic modulus and mechanical dissipation. The depth ...

16. Determination of nanoparticle surface coatings and nanoparticle Purity using microscale thermogravimetric analysis analysis
Topic: Nanomaterials
Published: 1/8/2014
Authors: Elisabeth Mansfield, Christopher Michael Poling, Jenifer L. (Jenifer) Blacklock, Katherine M Tyner
Abstract: The use of nanoparticles in some applications (i.e., nanomedical, nanofiltration or nanoelectronic) requires small-scale samples with well-known purities and composition. In addition, when nanoparticles are introduced into complex environments ( ...

17. Atom probe tomography evaporation behavior of C-axis GaN nanowires: Crystallographic, stoichiometric, and detection efficiency aspects
Topic: Nanomaterials
Published: 11/13/2013
Authors: Norman A Sanford, David R Diercks, Brian Gorman, R Kirchofer, Kristine A Bertness, Matthew David Brubaker
Abstract: The field evaporation behavior of c-axis GaN nanowires was explored in two different laser-pulsed atom probe tomography (APT) instruments. Transmission electron microscopy imaging before and after atom probe tomography analysis was used to assist in ...

18. Controlling Foam Flammability and Mechanical Behavior by Tailoring the Composition of Clay-Based Multilayer Nanocoatings
Topic: Nanomaterials
Published: 9/23/2013
Authors: Yu-Chin Li, Yeon Seok Kim, John R Shields, Rick D Davis
Abstract: This is the most comprehensive evaluation of Layer-by-Layer (LbL) coatings intended to reduce the flammability of polymeric materials. Through a systematic variation of the coating recipe, an ideal combination of the coating attributes was ide ...

19. Disparate effects of an O2 internal impurity on the elongation and quantum transport of gold and silver nanowires
Topic: Nanomaterials
Published: 8/21/2013
Authors: Shmuel Barzilai, Francesca M Tavazza, Lyle E Levine
Abstract: In this work we investigated the effects of an internal O2 impurity on the conductance of elongated gold and silver nanowires (NWs) using density functional theory (DFT) calculations. We found that the O2 interacts with these metallic NWs very diffe ...

20. Temperature-Programmed Electrospray-Differential Mobility Analysis for Characterization of Ligated Nanoparticles in Complex Media
Topic: Nanomaterials
Published: 8/12/2013
Authors: De-Hao D. Tsai, Frank W DelRio, John M Pettibone, Pin Ann Lin, Jiaojie Tan, Michael Russel Zachariah, Vincent A Hackley
Abstract: In this study, an electrospray-differential mobility analyzer (ES-DMA) was operated with an aerosol flow-mode, temperature-programmed approach to enhance its ability to characterize the particle size distributions (PSDs) of nanoscale particles (NPs) ...

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