Materials Literature
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The ability to design proteins with desired properties by using protein structural information will allow us to create high-value therapeutic and diagnostic products. Using the protein structures of lambda lysozyme and the SH3 domain of human Crk, we designed a synthetic protein switch that controls the activity of ly…
This research was conducted to characterize the properties of the metal–carbon fiber composites. The metal-carbon fibers composites were synthesized from the metal salt of Al or Cu or Zn or Mg and kapok fiber by pyrolysis at 400 to 700°C. The composites products were characterized by FTIR, XRD, SEM and EDS. Generally,…
Abstract In this work charge trapping and electroluminescence (EL) quenching in rare‐earth (RE) implanted SiO2 on Si as a function of injected charge into the dielectric were studied. The blocking of the luminescent REOX nanoclusters from the hot exciting electrons by negative charge trapping in a defect region (shell…
Acceptor doping of zinc oxide thin films prepared by radio-frequency diode sputtering, using nitrogen as a doping source, was realized during sputtering in Ar/N 2 gas mixture or via ion implantation of 180 keV N ions. Effects of N doping and (Al,Ga):N co-doping on the films' properties have been studied. Highly resist…
This paper offers a new set of “generic”, data-based hole size and crank length prediction models for spherical orbital debris particles impacting multi-plate targets at velocities up to ~12 km/s. The equations are applicable to a wide variety of spacecraft target configurations, but are limited to hole sizes above, b…
,Analytical models to predict the compressive strength of unidirectional composites along fiber direction are either based on microbuckling, kinking of fibers or fiber splitting. Experiments showed that all those mechanisms are together responsible for the failure. The present work evaluates and compares some of the e…
A multiscale modeling methodology that combines the predictive capability of discrete dislocation plasticity and the computational efficiency of continuum crystal plasticity is developed. Single crystal configurations of different grain sizes modeled with periodic boundary conditions are analyzed using discrete disloc…
The title complexes, [RuCl(C(9)H(21)N(3))(C(12)H(12)N(2)O(2))]ClO(4)·2C(2)H(3)N, (I), and [Ru(C(9)H(21)N(3))(C(12)H(12)N(2)O(2))(H(2)O)](ClO(4))(2)·2H(2)O, (II), display similar structures with the Ru atom in a distorted octahedral environment. In the crystal packing of the chloride complex, (I), the Ru complex molecu…
A non-destructive ultrasonic tester was developed to measure the stiffness of pulp bundles. The mechanical properties of pulp are important when estimating the behaviour of paper under stress. Currently available pulp tests are tedious and alter the fibres structurally and mechanically. The developed tester employs (9…
Excitation energy transfer (EET) in molecular systems is studied theoretically. Chromophore complexes are considered which are formed by a butanediamine dendrimer with four pheophorbide-a molecules. To achieve a description with an atomic resolution and to account for the effect of an ethanol solvent a mixed quantum c…
A novel 1D/1D semiconductor/semiconductor nanocomposite-based photodetector is fabricated by X. S. Fang and co-workers on page 2305 from highly crystalline ZnS/ZnO biaxial nanobelts. Optimized performance of the ZnS/ZnO nanobelt photodetector is better than that of pure ZnS or ZnO nanostructures, as it combines UV-A p…
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The Hamburg Wheel Tracking Device (HWTD) is used in the laboratory to evaluate an asphalt mixture’s potential for failure in the field. This test observes damage due to rutting and moisture susceptibility on a prepared asphalt sample. The test is generally run at 50° C regardless of the type of mix or the grade of asp…
New multifunctional materials that include fluid passages are being developed. These materials hold promise for future high-performance aerospace structures. The fluid in the passages can enhance heat transfer, control deformation, provide resin for healing or remodeling, disclose damage, and modify stiffness and damp…
Carbon nanotubes (CNTs) have been widely employed as the key components in various biosensors due to their unique properties, such as very large surface to volume ratio, high sensitivity to their surface adsorbates, and good compatibility with most chemical and biological compounds. In this chapter, the electrocatalyt…
Abstract The most critical problem in commercialization of the dye‐sensitized solar cell (DSSC) is its long‐term stability. Many factors contribute to the instability of a DSSC. In order to clarify the role of the surface defects on the cell instability, we modified the TiO2 surface chemical states, fabricated DSSCs w…
In situ proteolysis is one of the most effective rescue strategies for protein crystallization, and optimization of the ratio between the protein and the protease is one of the key steps in the process. Seeding is a very powerful tool to optimize crystallization conditions and can be performed by most crystallization…
A two part research study has been completed on the topic of compression after impact (CAI) of thin facesheet honeycomb core sandwich panels. The research has focused on both experiments and analysis in an effort to establish and validate a new understanding of the damage tolerance of these materials. Part 2, the subj…
Textured surfaces can reduce friction due to decreased contact area between two surfaces, and could therefore increase the reliability of micro-electro-mechanical systems (MEMS). The problem with some microtextures is their inability to withstand significant amounts of wear, often deforming or breaking, thus limiting…
A multiscale modeling methodology was developed that incorporates a statistical distribution of fiber strengths into coupled micromechanics / finite element analyses. A parametric study using the NASA Micromechanics Analysis Code with the Generalized Method of Cells was performed to assess the effect of variable fiber…