• Diameter-dependent kinetics of activation and deactivation in carbon nanotube population growth

    M. Bedewy, E.R. Meshot, A.J. Hart. Diameter-dependent kinetics of activation and deactivation in carbon nanotube population growth. Carbon 50(14):5106-5116:2012. [http://dx.doi.org/10.1016/j.carbon.2012.06.051] We reveal that the collective growth of vertically aligned carbon nanotube (CNT) forests by chemical vapor deposition (CVD) is governed by the size-dependent catalytic behavior of metal nanoparticles, which can be quantitatively related to the…

  • Capillary bending of Janus carbon nanotube micropillars

    S. Tawfick, A.J. Hart, M. De Volder. Capillary bending of Janus carbon nanotube micropillars. Nanoscale 4:3852-3856, 2012. [http://dx.doi.org/10.1039/C2NR30802A] We present a scalable process for the fabrication of slanted carbon nanotube micropillar arrays by inclined metal deposition and capillary self-assembly. Local control of the micropillar angle from vertical to nearly horizontal is achieved, and is explained…

  • Synthesis of tall carpets of vertically aligned cnts via in situ generation of water vapor by preheating of added oxygen

    G.D. Nessim, A. Al-Obeidi, H. Grisaru, E.S. Polsen, C.R. Oliver, T. Zimrin, A.J. Hart, D. Aurbach, C.V. Thompson. Synthesis of tall carpets of vertically aligned carbon nanotubes via in situ generation of water vapor by preheating of added oxygen. Carbon 50:4002-4009, 2012. [http://dx.doi.org/10.1016/j.carbon.2012.04.043] Dense millimeter-tall carpets of vertically aligned carbon nanotubes (VACNTs) were grown using…

  • Fabrication, densification, and replica molding of 3D carbon nanotube microstructures

    D. Copic, S.J. Park, S. Tawfick, M. De Volder, A.J. Hart. Fabrication, densification, and replica molding of 3D carbon nanotube microstructures. Journal of Visualized Experiments 65:e3980, 2012. [http://dx.doi.org/10.3791/3980] Watch the VIDEO! Read the accompanying protocol. Our goal is to introduce vertically aligned carbon nanotubes (CNTs), which we refer to as CNT “forests”, as a new…

  • High-speed in situ X-ray scattering of carbon nanotube film nucleation and self-organization

    E.R. Meshot, E.A. Verploegen, M. Bedewy, S. Tawfick, A.R. Woll, K.S. Green, M. Hromalik, L.J. Koerner, H.T. Philipp, M.W. Tate, S.M. Gruner, A.J. Hart. High-speed in situ X-ray scattering of carbon nanotube film nucleation and self-organization. ACS Nano. 6:5091–5101, 2012. [http://dx.doi.org/10.1021/nn300758f][Supporting Material .pdf][Supporting Video 1][Supporting Video 2] The production of high-performance carbon nanotube (CNT) materials…

  • Adam Stevens awarded the Robert M. Caddell Memorial Scholarship

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    Adam Stevens has been awarded the University of Michigan Robert M. Caddell Memorial Scholarship based on his research in large-area printing of nanoparticle patterns and their application to low-cost growth of CNT forests. The Robert M. Caddell Memorial Scholarship is awarded annually to ME undergraduate students performing outstanding research on materials and manufacturing. Congratulations!

  • Justin Beroz awarded the William Mirsky Memorial Fellowship

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    Once per year, the William Mirsky Memorial Fellowship is presented to an ME MSE student who has exhibited outstanding research achievement and high academic achievement. This year this fellowship has been awarded to Justin Beroz for his research in direct-write self-assembly and high-precision manipulation of liquids. Congratulations!

  • John Hart receives ONR YIP Award

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    John Hart has been selected to receive a 2012 Young Investigator Program (YIP) Award from the Office of Naval Research, for proposed research “Fundamental Mechanics of Assemblies and Joints of Continuous Long Carbon Nanotubes”. Hart is one of 26 winners selected nationwide from more than 350 candidates across all disciplines, and one of 3 winners…

  • Engineering of micro- and nanostructured surfaces with anisotropic geometries and properties

    S. Tawfick, M. De Volder, D. Copic, S. Park, E.S. Polsen, C.R. Oliver, M.J. Roberts, A.J. Hart. Engineering of micro- and nanostructured surfaces with anisotropic geometries and properties. Advanced Materials. [http://dx.doi.org/10.1002/adma.201103796] Widespread approaches to fabricate surfaces with robust micro- and nanostructured topographies have been stimulated by opportunities to enhance interface performance by combining physical and…

  • Fabrication, densification, and replica molding of 3D carbon nanotube microstructures

    D. Copic, S. Park, S. Tawfick, M. De Volder, A.J. Hart. Fabrication, densification, and replica molding of 3D carbon nanotube microstructures. Journal of Visualized Experiments.” We present methods for fabrication of patterned microstructures of vertically aligned carbon nanotubes (CNTs), and their use as master molds for production of polymer microstructures with organized nanoscale surface texture.…