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Author: john bonevich

Displaying records 11 to 20 of 68 records.
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11. Preparation and Properties of Nanoparticles of Calcium Phosphates with Various Ca/P Ratios
Published: 7/1/2010
Authors: Limin Sun, Laurence Chung Lung Chow, Stanislav A. Frukhtbeyn, John E Bonevich
Abstract: This study aimed at preparing and studying the properties of nanoparticles of calcium phosphate (nCaP) with Ca/P ratios ranging from 1.0 to 1.67 using a spray-drying technique. Micro-structural analyses results suggested that the nCaPs with Ca/P ra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900938

12. Measuring the Size of Nanoparticles Using Transmission Electron Microscopy (TEM)
Published: 3/1/2010
Authors: John E Bonevich, Wolfgang K. Haller
Abstract: This assay protocol outlines procedures for sample preparation and the determination of mean nanoparticle size (in projection) using transmission electron microscopy (TEM). The projected diameter is the diameter of an equivalent hard uniform sphere s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854083

13. Silicon Nanowire Nonvolatile-Memory with Varying HfO2 Charge Trapping Layer Thickness
Published: 12/9/2009
Authors: Xiaoxiao Zhu, Qiliang Li, D. E Ioannou, H Gu, Helmut Baumgart, John E Bonevich, John S Suehle, Curt A Richter
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907138

14. Compositional Control in Electrodeposited Pt(subscript 100-x)Cu(subscript x) Alloys.
Published: 10/7/2009
Authors: J Mallett, Ugo Bertocci, John E Bonevich, Thomas P Moffat
Abstract: The electrodeposition of Pt100-xCux alloys is demonstrated using an electrolyte comprised of 1mol/L H2SO4, 0.001 mol/L K2PtCl4 and 0.1 mol/L CuSO4. Film growth proceeds by facile Cu underpotential deposition (upd) occurring in parallel with Pt overpo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902596

15. Superconformal Electrodeposition of Co and Co-Fe Alloys using 2-Mercapto-5-benzimidazolesulfonic Acid (MBIS)
Published: 6/10/2009
Authors: Chang H. Lee, John E Bonevich, Joseph E. Davies, Thomas P Moffat
Abstract: Superconformal Co(Fe) filling of submicrometer trenches by electrodeposition is demonstrated in the presence of 2-mercapto-5-benzimidazolesulfonic acid (MBIS). MBIS inhibits the initiation of Co deposition. Inhibition breakdown is characterized by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902266

16. AC susceptibility studies of magnetic relaxation in nanoparticles of Ni dispersed in silica
Published: 4/1/2009
Authors: V Singh, M Seehra, John E Bonevich
Abstract: Temperature dependence of AC susceptibilities χ' and χ'' are reported using frequencies fm = 0.1 Hz, 1 Hz, 99 Hz, 499 Hz and 997 Hz for nanoparticles (NPs) of Ni dispersed in silica (Ni/SiO2:15/85) with the mean sizes D=3.8 nm, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900254

17. A Method for Fabricating Conductometric Gas Sensors of Metal Oxide Nanotubes Formed in Porous Aluminum Oxide Membranes
Published: 2/2/2009
Authors: Reit Artzi-Gerlitz, Kurt D Benkstein, David L. Lahr, Joshua L. Hertz, Christopher B Montgomery, John E Bonevich, Stephen Semancik, Michael J Tarlov
Abstract: We describe a general, simple strategy for fabricating conductometric gas sensors from metal oxide nanotubes formed in nanoporous aluminum oxide membranes. In this approach, the aluminum oxide membrane serves as both a template for growth of the sens ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832271

18. 400-Fold Reduction in Saturation Field by Interlayering
Published: 1/13/2009
Authors: William F. Egelhoff Jr., John E Bonevich, Philip Pong, John Unguris, Robert D McMichael, Gery R Stafford, Carlos R Beauchamp
Abstract: The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable saturation fields that can convert an otherwise magnetically soft film into a magnetically hard one. We have found that by i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854046

19. Inducing analytical orthogonality in tungsten oxide-based microsensors using materials structure and dynamic temperature control
Published: 1/4/2009
Authors: Kurt D Benkstein, Baranidharan Raman, David L. Lahr, John E Bonevich, Stephen Semancik
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902372

20. Nickel-Silica Nanocomposite: Variation of the Blocking Temperature With Magnetic Field and Measuring Frequency
Published: 2/27/2008
Authors: V Singh, M Seehra, John E Bonevich
Abstract: The variation of the blocking temperature T(subscript B) with measuring frequency f(subscript m) and applied field H are reported for Ni nanoparticles (NPs) embedded in SiO(subscript 2) matrix with the nominal composition Ni/SiO(subscript 2) (15/85). ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853519



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