NIST Special PublicationThe Institute, 2001 |
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Page 1
... molecules , allowing study of the underlying magnetic properties of materials . They also scatter quite differently from normal hydrogen atoms than they do from heavy hydrogen ( deuterium ) , allowing selective study of individual ...
... molecules , allowing study of the underlying magnetic properties of materials . They also scatter quite differently from normal hydrogen atoms than they do from heavy hydrogen ( deuterium ) , allowing selective study of individual ...
Page 3
... molecular and biological systems . 218 m SANS for polymer char- acterization , sponsored by NIST Polymers Division . 15 22 Vertical Sample Reflectometers : instruments for measuring reflectivities down to 10-8 to determine sub- surface ...
... molecular and biological systems . 218 m SANS for polymer char- acterization , sponsored by NIST Polymers Division . 15 22 Vertical Sample Reflectometers : instruments for measuring reflectivities down to 10-8 to determine sub- surface ...
Page 8
... molecular vibrations . Moreover , the unique nature of the neutron - nucleus interaction permits the observation of all vibrational modes in an NVS experiment , not just those that satisfy appropriate symmetry - based selection rules as ...
... molecular vibrations . Moreover , the unique nature of the neutron - nucleus interaction permits the observation of all vibrational modes in an NVS experiment , not just those that satisfy appropriate symmetry - based selection rules as ...
Page 9
... molecule . This spectrum exemplifies the overall quality and high - resolution capabilities enabled by the marked improvement in sensitivity . There is fair agreement between calculation and experi- ment for many features in the ...
... molecule . This spectrum exemplifies the overall quality and high - resolution capabilities enabled by the marked improvement in sensitivity . There is fair agreement between calculation and experi- ment for many features in the ...
Page 11
... molecular origin of the peak is unclear , its characteristic energy suggests that it is a collective excitation between the low energy acoustic modes and localized high energy optic modes ( representing local bond vibrations ...
... molecular origin of the peak is unclear , its characteristic energy suggests that it is a collective excitation between the low energy acoustic modes and localized high energy optic modes ( representing local bond vibrations ...
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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...