US – Page 408 – TechConnect Briefs

Molecular Dynamics Simulations on Nanocomposites Formed by Intermetallic Dispersoids of B2 Structure and Aluminum Matrices

Namkung M., Paik S., Wincheski R.A., NASA Langley Rsearch Center, US

Molecular dynamics simulations were performed in order to characterize the local lattice structure in the vicinity of the interfaces between nanosized B2 intermetallic aluminide dispersoids and aluminum matrices. The dispersoid materials selected for the present [...]

Surface Modification of Al203 Fiber with Nanoparticles Using a Dry Mechanical Coating Technique

Coowanitwong N., Wu C-Y, Nguyen J., Cai M., Ruthkosky M., Rogers J., Feng L., Watano S., Yoshida T., University of Florida, US

Nanoparticles are of great interest to many industries due to their unique properties. One of the well-known properties is high surface area, which is critically essential to enhancing performance activity [1] and greatly vital to [...]

Multivariant Measurements for Thin Film Adhesion as a Function of Temperature and Thin Film Thickness

Chiang M., Song R., Karim A., Amis E.J., National Institute of Standards and Technology, US

The progress of a proposed high-throughput combinatorial approach to the edge delamination test is reported. This approach can construct the adhesion reliability, as a function of temperature and film thickness (in the sub-micron range) in [...]

Chemically Functionalized Clay Epoxy Nanocomposites for Aerospace Applications

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

Reinforcement of polymeric resin with nanoclay platelets has resulted in lightweight materials with enhanced mechanical and thermal properties. The selection of clay as reinforcing material is extremely appealing because of cost, high thermal inertness, and [...]

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 [...]

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, [...]