NIST Special PublicationThe Institute, 2001 |
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Page 8
... ratio , the measured scat- tering intensities were limited by a relatively small detector solid angle . Moreover , the BT - 4 beam time was typically shared with a triple - axis instrument . A second - generation FANS is currently being ...
... ratio , the measured scat- tering intensities were limited by a relatively small detector solid angle . Moreover , the BT - 4 beam time was typically shared with a triple - axis instrument . A second - generation FANS is currently being ...
Page 9
... ratio . The enhanced capabilities of the FANS - I instrument have already been demonstrated for a variety of materials including pro- tonic conductors , organic solids , metal hydrides , carbon nanotubes , and metal oxides . These ...
... ratio . The enhanced capabilities of the FANS - I instrument have already been demonstrated for a variety of materials including pro- tonic conductors , organic solids , metal hydrides , carbon nanotubes , and metal oxides . These ...
Page 12
... ratio to values comparable to that obtained with pinhole instruments . This technique , widely utilized for x - rays for many years , has only recently been successfully adapt- ed for neutrons [ 1 ] as dynamical diffraction effects ...
... ratio to values comparable to that obtained with pinhole instruments . This technique , widely utilized for x - rays for many years , has only recently been successfully adapt- ed for neutrons [ 1 ] as dynamical diffraction effects ...
Page 14
... ratio of the elastic scattering to the total scattered intensity . For all temperatures studied , a quasielastic signal due to the paramagnetic Mn2 + ions and the dynamics of the cyanamide ligand EISF 1.00 0.80 0.60 Experimental ...
... ratio of the elastic scattering to the total scattered intensity . For all temperatures studied , a quasielastic signal due to the paramagnetic Mn2 + ions and the dynamics of the cyanamide ligand EISF 1.00 0.80 0.60 Experimental ...
Page 24
... ratio of Al : Si cannot exceed unity , limiting the cation fraction to 1/7 the total number of atoms . A new class of materials that have Li incorporated as a tetrahedral framework species has recently been discovered [ 2,3 ] . So ...
... ratio of Al : Si cannot exceed unity , limiting the cation fraction to 1/7 the total number of atoms . A new class of materials that have Li incorporated as a tetrahedral framework species has recently been discovered [ 2,3 ] . So ...
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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...