NIST Special PublicationThe Institute, 2001 |
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Page 7
... peak centered around 0.432 nm . At the NG - 7 guide a PG ( 002 ) crystal was used to extract a beam in the range of 0.235 nm to 0.475 nm . Both contact and phase - contrast images were recorded in order to obtain the derivative on the ...
... peak centered around 0.432 nm . At the NG - 7 guide a PG ( 002 ) crystal was used to extract a beam in the range of 0.235 nm to 0.475 nm . Both contact and phase - contrast images were recorded in order to obtain the derivative on the ...
Page 9
... peak intensities . Indeed , these proton - related fea- tures largely disappear at temperatures as low as 200 K , indicating that there is significant proton motion even at this low temperature . Figure 5 shows the FANS - I spectrum for ...
... peak intensities . Indeed , these proton - related fea- tures largely disappear at temperatures as low as 200 K , indicating that there is significant proton motion even at this low temperature . Figure 5 shows the FANS - I spectrum for ...
Page 11
... peak " has of late been associated with an excess feature that shows up in the vibrational density of states of many materials , generally in the Debye region , between 1 meV and 10 meV . While the molecular origin of the peak is ...
... peak " has of late been associated with an excess feature that shows up in the vibrational density of states of many materials , generally in the Debye region , between 1 meV and 10 meV . While the molecular origin of the peak is ...
Page 15
... peak is constant over the entire Q - range , as expected for a simple , localized jump motion ( the correlation time is≈ 70 ps at 425 K ) . Thus , the pyrazine ligands must be performing л - jumps about the axis defined by the ...
... peak is constant over the entire Q - range , as expected for a simple , localized jump motion ( the correlation time is≈ 70 ps at 425 K ) . Thus , the pyrazine ligands must be performing л - jumps about the axis defined by the ...
Page 16
... peaks ( red arrows ) indicate strong order while the broad peaks ( blue arrows ) indicate that disorder is present . R.M.Dimeo and D.A.Neumann NIST Center for Neutron Research National Institute. 6 RESEARCH HIGHLIGHTS PROBING DISORDER IN ...
... peaks ( red arrows ) indicate strong order while the broad peaks ( blue arrows ) indicate that disorder is present . R.M.Dimeo and D.A.Neumann NIST Center for Neutron Research National Institute. 6 RESEARCH HIGHLIGHTS PROBING DISORDER IN ...
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Common terms and phrases
Activation Analysis Antiferromagnetic atoms Broholm71 Carbon Nanotubes Center for Neutron Chem Chen-Mayer Chopper cold neutron Crystal Structure D. A. Neumann 105 detector Determination Dynamics energy Erwin exchange bias Ferromagnetic FIGURE Fullerene Gaithersburg Gnäupel-Herold 199 Hydrogen Institute of Standards instrument intensity J. W. Lynn Lamaze lattice lithium Macromol Magnetic Order Magnetic Structure MBLA measurements Molecular molecules monochromator nanotubes NCNR neutron beam Neutron Depth Profiling Neutron Diffraction Neutron Reflectivity Neutron Reflectometry Neutron Research National Neutron Scattering Study NIST NIST Center Nucl P. C. Brand peak Phase Transitions phase-contrast image phonon Phys Polarized Polymer Powder Diffraction properties protein protons pyrazine Q. Z. Huang quasielastic R. M. Lindstrom 106 Radioanal reactor Research National Institute Residual Stress resolution sample Satija Small Angle Neutron solid Standards and Technology surface technique Technology Gaithersburg temperature thermal Thin Films Udovic University vortex x-ray Yildirim 105 Zeolites
Popular passages
Page 18 - ... nanoropes"[10]. The intertube interactions in nanoropes can be probed by applying external pressure to vary the intertube distance. For fullerenes, such high-pressure studies have yielded many interesting results including new compounds such as the pressure-induced polymeric phases of C«>- It is, therefore, of interest to inquire if similar covalent-bonding can occur between the nanotubes in a rope. This could have important consequences for nanoscale device applications and composite materials...
Page 19 - The new pressure-induced, high density phasesflO] reported here may provide a way of synthesizing novel carbon base materials with interesting physical properties. For example interlinking of the nanotubes may improve the mechanical performance of composites based on these materials. The change in the band gap of a SWNT with applied pressure can be exploited to realize various quantum devices on a single nanotube with variable and reversible electronic properties [10]. Finally we note that...
Page 19 - ... Fig.3(a)). This two dimensional interlinked structure is about four times stiffer than the ID interlinked phase and sixteen times stiffer than the vdW nanoropes. We observe that applying even higher pressures yields more complicated and denser phases for many of the nanoropes studied here (see Fig.3). For (9,0) nanoropes, we find that the nanotubes are interlinked along three directions forming a hexagonal network. The length of the intertube bond, dC-c= 1.644 A, is significantly elongated for...
Page 31 - NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD...
Page 9 - Laboratory for Research on the Structure of Matter and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA...
Page 41 - Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Page 19 - T. Yildirim, O. Gulseren, C. Kilic, and S. Ciraci, Phys. Rev. B 62, 12648 (2000).
Page 69 - Su TJ, Green RJ, Wang Y, Murphy EF, Lu JR, Ivkov R, Satija SK, 'Adsorption of lysozyme onto the silicon oxide surface chemically grafted with a monolayer of pentadecyl-1-ol', Langmuir, 2000 16 4999-5007.
Page 18 - Carbon nanotubes, originally discovered as by products of fullerene synthesis [1], are now considered to be the building blocks of future nanoscale electronic and mechanical devices [2]. It is therefore desirable to have a good understanding of their electronic and mechanical properties and the interrelations between them. In particular, single wall carbon nanotubes (SWNT) provide a system where the electronic properties can be controlled by the structure of the nanotubes and by various deformations...