Materials Literature
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Protein adhesion plays a major role in determining the biocompatibility of materials. The first stage of implant integration is the adhesion of protein followed by cell attachment. Surface modification of implants (surface chemistry and topography) to induce and control protein and cell adhesion is currently of great…
This paper considers an approach for analyzing fibrillar collagen structures from electron microscopy images. It enables the quantitative comparison between collagen structural data (electron-optical data) and chemical data. The particular objectives of the paper are to model the electron microscopy images according t…
The optical transmittance and the electrical capacitance as a function of the externally applied dc voltage are obtained for a twisted nematic cell composed of inorganic clay; i.e., sodium montmorillonite, as an additive to the organic liquid crystal E7. Higher loaded nematic, with smectite clay content of over 3 wt%,…
A theoretical approach to predicting the spatial extent of the amorphous to crystalline transition region during the probe recording process on phase-change storage media is presented. The extent of this transition region determines the ultimate achievable linear density for data storage using phase-change materials.…
Hollow Al 2 O 3 spheres with ∼2 μm in diameter and ∼200 nm in wall thickness were prepared successfully via the calcination of the Al/AlOOH· n H 2 O core‐shell particles, prepared by wet‐chemical method using commercial microscale aluminum powders as raw materials, at 900°–1100°C in air. X‐ray powder diffraction, diff…
An experimental approach is used to identify Galfenol material properties under dc magnetic bias fields. Dog-bone-shaped specimens of single crystal Fe100−xGax, where 18.6⩽x⩽33.2, underwent tensile testing along two crystallographic axis orientations, [110] and [100]. Young’s modulus and Poisson’s ratio sensitivity to…
A dc-detected high-frequency electron paramagnetic resonance (HF-EPR) technique, based on a standard superconducting quantum interference device (SQUID) magnetometer, has significant advantages over traditional HF-EPR based on microwave absorption measurements. The SQUID-based technique provides quantitative determina…
Knoop and Vickers hardness, Young's Modulus, and fracture toughness measurements were performed on Corning's Code 9575 calcium fluoride in various orientations. Other commercially available sources of calcium fluoride were also measured for comparison of properties. Knoop hardness and elastic properties exhibited a de…
Calcium magnesium acetate has been assessed as an agent for the reduction of NO x, SO 2, and HCl, at the pilot scale, in a down-fired combustor operating at 80 kW th . In addition to this, the chemical and physical processes that occur during heating have been investigated. Benchmarking of calcium magnesium acetate wi…
Molecular dynamics (MD) simulations of nanoindentation of multiwalled carbon nanotubes (MWCNTs) are carried out to study the deformation mechanism and the mechanical properties of MWCNTs in the radial direction. The MWCNT is found to be soft in its radial direction, with nanohardness rising slowly from about 6 to 15 G…
We have developed a novel cell culture material that regulates cell adhesion by changes in potassium ion concentration. The material is a polyethylene substrate grafted to a copolymer of the thermoresponsive polymer N-isopropylacrylamide (NIPAM) and benzo-18-crown- 6-acrylamide (BCAm), with a pendant crown ether as se…
The La0.8Sr0.2MnO3 compound presents a ferromagnetic paramagnetic transition around room temperature to which a reasonably high magnetocaloric effect is associated, turning this material of interest for application in magnetic refrigeration. We synthesized this compound in fiber single crystalline form by the Laser He…
We report angle-dependent high-field electron-paramagnetic-resonance data collected for single-crystal samples of Mn12–Ac. The spectra reveal fine structures associated with various Mn12 species corresponding to different disordered local environments. Each of the fine structures exhibits a distinct dependence on the…
We have investigated the overall excitation energy relaxation dynamics in linear porphyrin arrays as well as the energy transport phenomena by attaching an energy acceptor to one end of a linear porphyrin array by using steady state and time-resolved spectroscopic measurements. We have revealed that the solvation dyna…
A 1997 Nature paper reported that a novel Ru(2)-incorporated sandwich-type polyoxometalate, {[WZnRu(III)(2)(OH)(H(2)O)](ZnW(9)O(34))(2)}(11)(-), is an all-inorganic dioxygenase catalyst for the hydroxylation of adamantane and the epoxidation of alkenes using molecular oxygen. Specifically, it was reported that the abo…
The magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensiti…
Colloidal nanocrystals are nanometer-sized, solution-grown inorganic particles stabilized by a layer of surfactants attached to their surface. The inorganic cores exhibit useful properties controlled by composition as well as size and shape, while the surfactant coating ensures that these structures are easy to fabric…
Based on density-functional theory and density-functional perturbation theory we have studied the thermodynamical and vibrational properties of $\mathrm{Mg}{({\mathrm{AlH}}_{4})}_{2}$. The crystal structure recently proposed on the basis of x-ray powder-diffraction data has been confirmed theoretically by the comparis…
The fundamental nature of the magnetic phase transitions in the Ni-Mn-Ga system is investigated quantitatively. By compositional tuning, the first-order metamagnetic/martensitic structural transition (occurring at TM≈200K in the parent compound Ni2MnGa) and the second-order/continuous transition (at TC≈375K in the par…
Manganese is a common dopant to achieve dilute magnetic semiconductors. Most magnetic semiconductors are hole-type and the Curie temperature is critically depending on the holes concentration. Boron can be used to increase the holes concentration and enhance the Curie temperature. In systems with both Mn and B dopants…