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Atoms and molecules adsorbed (deposited) on carbon nanotube bundles (CNTB) are PowerPoint Presentation

Atoms and molecules adsorbed (deposited) on carbon nanotube bundles (CNTB) are

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Atoms and molecules adsorbed (deposited) on

carbon nanotube bundles (CNTB) are

interesting for scientific and practical reasons.

On the scientific side novel one- and two-

dimensional (1d, 2d) forms of matter may be

fabricated on CNTB. On the practical side the

storage capacity of CNTB, especially for

hydrogen and organic molecules, has attracted

attention. We are studying the 1d and 2d

thermal and structural properties of atoms and

molecules, including deuterium, deposited on

CNTB. We use heat capacity, vapor pressure

and neutron scattering measurements. Matter

in 1d should have no phase transitions above

T=0K, a prediction we have been able to

verify in the 1K to 20K range.

See neutron scattering results in Phys. Rev. B, 71, 155411

(2005), Phys. Rev. B, 70, 035410 (2004).

Heat of adsorption (+) and heat capacity isotherms [2K (bottom), 3K and 4K (top)] vs. the amount adsorbed, first layer on CNTB. A: hydrogen, B: helium. Adsorption goes on: 1) Imperfect sites (1d), 2) Outer grooves, see inflection at 9 ccSTP (1d, 2d), and 3) The outside surface of bundle up to layer completion (2d) (for H2, dip in heat capacity isotherm at 22.5 ccSTP). T. A. Wilson’s PhD dissertation, U. of Washington (2004), J. Low Temp. Phys. 134, 115 (2004).

Novel One- and Two-dimensional SystemsO. E. Vilches and L. B. Sorensen, U. of WashingtonDMR-0245423Recently, eleven undergraduate (U) and

one REU student have participated in this

program, with eight having graduated and

gone to either graduate school or work in

the private sector, as follows:

Vandervelde (Illinois), Schneble

(Cambridge), Higgins (Irvine), Ramunno-

Johnson (UCLA), Winters (Colorado

State), Batchellor (UW), Horn, Davis,

Holmes (REU). Tate Wilson (Ph.D. ’04)

is a post-doc at U. Mass., Amherst.

Current students: Natasha Nichols (MSc),

Subramanian Ramachandran (PhD),

Dario Machleidt (U), Jeremy Morales (U)

and Kevin Dillon (U).

Societal Impact:

Work on these projects has proven very

appealing to undergraduates: a blend

of nanophysics (carbon nanotubes), low

temperatures (working with liquid

helium), learning about and supporting

thermodynamic and neutron scattering

measurements by doing their own

experiments, and working with and

programming LabView controlled

experiments gives them a nice set of

working tools for graduate studies or

employment in the private sector. We

have attracted excellent graduate students

and could have a larger group if funds

would allow it.

Novel One- and Two-dimensional SystemsO. E. Vilches and L. B. Sorensen, U. of Washington,DMR-0245423
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