• Growth of conformal single-walled carbon nanotube films from Mo/Fe/Al2O3 deposited by electron beam evaporation

    A.J. Hart, A.H. Slocum, L. Royer. Carbon, 44(2):348-359, 2006. [http://dx.doi.org/doi:10.1016/j.carbon.2005.07.008] [PDF]   We discuss growth of high-quality carbon nanotube (CNT) films on bare and microstructured silicon substrates by atmospheric pressure thermal chemical vapor deposition (CVD), from a Mo/Fe/Al2O3 catalyst film deposited by entirely electron beam evaporation. High-density films having a tangled morphology and a Raman G/D…

  • Segmented and shielded structures for reduction of thermal expansion-induced tilt errors

    A.J. Hart, A.H. Slocum, J. Sutin. J. Int’l. Soc. Precision Engineering and Nanotechnology, 28:443-458, 2004. [http://dx.doi.org/10.1016/j.precisioneng.2004.01.002] [PDF]   The design and prototype tests of a segmented and shielded instrumentation structure, based on tube modules connected by canoe ball type kinematic couplings, are presented with application to a high-precision microscope for biological science experiments. The segmented…

  • Kinematic coupling interchangeability

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    A.J. Hart, A.H. Slocum, P.J. Willoughby. J. Int’l.Soc. Precision Engineering and Nanotechnology, 28:1-15, 2004. [http://dx.doi.org/10.1016/S0141-6359(03)00071-0] [PDF]   The deterministic nature of kinematic couplings enables closed-form characterization of interchangeability error, parametrized in terms of the magnitudes of manufacturing tolerances in the interface manufacturing and assembly processes. A process is suggested for calibrating kinematic couplings to reduce…

  • Linear motion carriage with aerostatic bearings preloaded by inclined iron core linear electric motor

    A.H. Slocum, M. Basaran, R. Cortesi, A.J. Hart. J. Int’l. Soc. Precision Engineering and Nanotechnology 27:382-394, 2003. [http://dx.doi.org/10.1016/S0141-6359(03)00037-0] [PDF]   A fundamentally precise and simple linear motion axis design is discussed where the attractive force from the linear motor is used to preload a carriage supported by six rigidly attached porous carbon air bearings. The…