NIST Special PublicationThe Institute, 2001 |
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Page 1
... atoms and 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 ...
... atoms and 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 ...
Page 14
... atoms of the pyrazine ring have been omitted , while the Mn , C , and N atoms are depicted as red , black , and blue spheres , respectively . FIGURE 2. The experimental EISF ( black circles ) for Mn [ N ( CN ) 2 ] 2 - pyz at 425 K , has ...
... atoms of the pyrazine ring have been omitted , while the Mn , C , and N atoms are depicted as red , black , and blue spheres , respectively . FIGURE 2. The experimental EISF ( black circles ) for Mn [ N ( CN ) 2 ] 2 - pyz at 425 K , has ...
Page 16
... atoms having a carbon atom at its apex seen in Fig . 1 ) . In the limit of a small barrier to reorientation , the methyl group can undergo nearly free rotation about the C - I axis . In the limit of a very high barrier , the methyl ...
... atoms having a carbon atom at its apex seen in Fig . 1 ) . In the limit of a small barrier to reorientation , the methyl group can undergo nearly free rotation about the C - I axis . In the limit of a very high barrier , the methyl ...
Page 18
... atom positions , c , and y are optimized . We observe that ( 7,0 ) nanotubes become elliptically distorted with applied pressure ( i.e. , decreasing nanotube - nanotube distance ) . At a critical pressure , we observe a structural phase ...
... atom positions , c , and y are optimized . We observe that ( 7,0 ) nanotubes become elliptically distorted with applied pressure ( i.e. , decreasing nanotube - nanotube distance ) . At a critical pressure , we observe a structural phase ...
Page 19
... atom ) , which is comparable to that of 1D polymerized C , molecules ( 20 meV / atom ) . Figure 2 also shows that another interlinked phase of ( 7,0 ) nanotubes becomes the ground state for lattice parameter smaller than 8.0 Å . In this ...
... atom ) , which is comparable to that of 1D polymerized C , molecules ( 20 meV / atom ) . Figure 2 also shows that another interlinked phase of ( 7,0 ) nanotubes becomes the ground state for lattice parameter smaller than 8.0 Å . In this ...
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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...