Papers – Page 9 – TechConnect Briefs

Next Generation Aerospace Composites Through Nanotechnology

Yebassa D., Balakrishnan S., Raghavan D., Howard University, US

Polymeric nanocomposites are a relatively new class of materials obtained by dispersing inorganic layered silicates in polymer matrix. Generally well-dispersed exfoliated morphology of clay platelets in nanocomposite is sought with the expectation that this would [...]

Optimizing Processing Conditions to Influence the Morphology of Nanocomposite

Raghavan D., Balakrishnan S., Gebrekristios Y., Howard University, US

In recent years, the area of nanocomposites has received considerable attention with the expectation that nanotechnology can lead to lighter, better materials for engineering applications. For example, the attractiveness of polymer-clay nanocomposites resides in the [...]

Nanopatterning of Periodically Strained Surfaces – A Kinetic Monte Carlo Simulation Study

Larsson M.I., Sabiryanov R.F., Cho K., Clemens B.M., Stanford University, US

We present kinetic Monte Carlo simulations of nanopatterning by using strain-assisted nucleation of adatom islands on periodically strained fcc(111) surfaces. The goal of our work is to predict conditions and limitations for producing nanopatterns. It [...]

Preparation and Characterization of New Lanthanide materials: Layered Double Hydroxide Intercalated by Luminescent Polyoxometalate Anions with Dawson-like [Eu(H2O)3(a2-P2W17O61]7- and Keggin-like [Eu2(H2O)2(PW11O39)]4-

Zhang C., Howell R.C., Xu W., Luo Q-H, Akins D.L., Francesconi L.C., Hunter College, US

Dawson-like [Eu(a1-P2W17O61]7-and Keggin-like [Eu2(PW11O39)2]8-were first isolated and x-ray crystallized in our group. In relation to previous work, we are interested in synthesizing new lanthanide materials by incorporating the title polyoxometalates (POMs) anions into layered double [...]

MEMS Fabrication Modeling with ChISELS: A Massively Parallel 3-D Level-Set Based Feature Scale Modeler

Musson L.C., Plimpton S.J., Schmidt R.C., Sandia National Laboratories, US

We are developing ChISELS (Chemically Induced Surface Evolution with Level-Sets), a parallel code to model 3-D material depositions and etches at feature scales on patterned wafers at low pressures. ChISELS is a platform on which [...]

Realistic Modeling of Complex Surface Processes

Rohl A.L., Wright K., Gale J.D., Curtin University, AU

Computer simulation is an essential tool in nanoscale science as it yields atomic models that allow interpretation of experiment data, while also having a predictive capability. Crucially, computer simulations must be able to describe all [...]

Nanostructured Metallic Thin Films: Measurement of Critical Exponents

Melo L.L., Farias R.J.C., Salvadori M.C., Cattani M., University of Sao Paulo, BR

We have deposited metallic films (Au, Pt) on silicon substrates. The deposition technique was the Metal Plasma Immersion Ion Implantation and Deposition. Their roughnesses have been measured using a Scanning Tunneling Microscope. From these roughnesses, [...]

Periodic Lattice Distortion in YBa2Cu3O7 50 nm film on SrTiO3

Navacerrada M.A., Acrivos J.V., San Jose State University, US

Synchrotron X-ray diffraction has been used to detect novel periodic lattice distortions (PLD) in highly c-axis oriented YBa2Cu3O7 (YBCO) 50 nm films grown on SrTiO3 substrate. The growth layer by layer of 50 nm YBCO, [...]

Ab Initio Simulation on Deposit Process of Al on Si Surface

Umeno Y., Kitamura T., Kyoto University, JP

It is important to clarify structure of contact between different materials for evaluation of properties of interfaces, which are substantial in electronic devices. Since interaction between different materials has to be evaluated based on the [...]

Surface Shaping by Ion Beams at Grazing Incidence: Simulations vs. Experiment

Stepanova M., Dew S.K., University of Alberta, CA

Miniaturization of electronic technologies highlights special approaches such as selforganization of nanostructures. Particularly, surface etching by ion beams at grazing incidence is of interest for applications, because it provides pronounced submicron size, self-organized ripples. Formation [...]