Materials Literature
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Tissue engineering (TE) is a new interdisciplinary field of applied research combining engineering and biosciences together with clinical application, mainly in surgical specialities, to develop living substitutes for tissues and organs. Tissue engineering approaches can be categorized into substitutive approaches, wh…
Heat capacity in the 1 K range and close to T g was studied in a series of poly( n -alkyl methacrylate)s, PnAMA, including some random copolymers. We report on two findings: (i) The glass transition temperature T g and the cooperativity of the α process that freezes-in at T g, N α ( T g ), decrease smoothly between me…
Magnetically controlled shape memory (MSM) materials are considered now as a potential candidate for a new class of actuators and sensors. Magnetic and mechanical properties of two NiMnGa alloys with different thermally induced martensitic phases have been studied. Five-layered tetragonal martensite (c/a=0.94) in the…
Tension and torsion as well as combined tension-torsion tests on NiTi Tubes are presented in this article. Two different specimens are used in the experiments: one is austenitic and the other is martensitic at room temperature. The experiments are performed at nearly isothermal conditions. However, non-isothermal effe…
The first complete investigation of the structure of the selective oxidation catalyst TS-1 is presented. Constant wavelength powder neutron diffraction data collected on isotopically substituted titanium silicalite (TS-1) samples, with a Si:Ti molar ratio of 39:1, have been studied using a combination of single and mu…
Magadiite, a layered sodium polysilicate, was organically modified by esterification of interlayer silanol groups with various aliphatic alcohols. Methanol was directly reacted with H-magadiite (acid-treated magadiite) by refluxing. The methanol-treated product showed an increase in the basal spacing and the 13 C NMR…
We demonstrate second-harmonic generation in highly symmetric thin films of chiral molecules. The films were prepared by spin-coating, and no external force (such as electric field poling) was used to induce noncentrosymmetry. The films have a nonpolar D n symmetry with second-order susceptibility values of 2−9 pm/V.…
Polarization and longitudinal strain of the commercial soft PZT piezoceramic PIC151 were measured as a function of amplitude and frequency of an AC electric field. The range of frequencies considered was selected in the quasi-static range from 0.01Hz to 1.0 Hz. The electric field was selected as triangular loading. Be…
Achieving the lofty goal of developing a tissue engineered heart will likely rely on progress in engineering the various components: blood vessels, heart valves, and cardiac muscle. Advances in tissue engineered vascular grafts have shown the most progress to date. Research in tissue-engineered vascular grafts has foc…
Kaolinite intercalates ortho - and para -nitroanilines ( o NA and p NA) between the layers whereas meta- nitroaniline ( m NA) is not intercalated. para- Nitroaniline takes a monolayer arrangement with the long axis inclined to the layers of kaolinite. o NA molecules also take a monolayer arrangement though the orienta…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Contribution to the Design of Molecular Switches: Novel Acid-Mediated Ring-Closing−Photochemical Ring-Opening of 2,3-Bis(heteroaryl)quinones (Heteroaryl = Thienyl, Furanyl, Pyrrolyl)Xiaohu Deng and Lanny S. LiebeskindView Author Information Emory University, Departme…
Layer-by-layer deposition of polyelectrolytes on porous supports is a convenient method for producing ultrathin membranes with moderate ion-transport selectivities. This study shows that the capping of poly(styrene sulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) membranes with a few layer pairs of poly(acrylic a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolystyrene Bead-Assisted Self-Assembly of Microstructured Silica Hollow Spheres in Highly Alkaline MediaGuangshan Zhu, Shilun Qiu, Osamu Terasaki, and Yen WeiView Author Information Department of Chemistry and State Key Laboratory of Inorganic Synthesis & Preparative…
NMR spectroscopy and computer modeling were used to characterize tiopronin monolayer-protected gold clusters (MPCs). These MPCs contain gold cores with a distribution of radii ranging from 0.4 to 2.6 nm. NOESY and HMQC spectra yielded assignments for all NMR sensitive nuclei in the tiopronin ligands. DOSY and T 2 expe…
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We report a study of oxygen isotope effects on low temperature specific heat, magnetization, and resistivity of La$_{1-x}$Ca$_{x}$MnO$_{3}$ and (La$_{1-y}$Pr$_{y})_{0.67}$Ca$_{0.33}$MnO$_{3}$. For the metallic compositions of La$_{1-x}$Ca$_{x}$MnO$_{3}$ and for charge-ordered La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ no change in…
Using density-functional theory (DFT) we calculate the Gibbs free energy to determine the lowest-energy structure of a RuO_2(110) surface in thermodynamic equilibrium with an oxygen-rich environment. The traditionally assumed stoichiometric termination is only found to be favorable at low oxygen chemical potentials, i…
We discuss the rich vibrational dynamics of nanometer-scale semiconducting and insulating crystals as probed by localized electronic impurity states, with an emphasis on nanoparticles that are only weakly coupled to their environment. Two principal regimes of electron-phonon dynamics are distinguished, and a brief sur…
Scaling theory, duality symmetry, and numerical simulations of a random network model are used to study the magnetoresistance of a metal/insulator/perfect conductor composite with a disordered columnar microstructure. The phase diagram is found to have a critical line which separates regions of saturating and non-satu…
The ultrafast time-dependence of the energy absorption of covalent solids upon excitation with femtosecond laser pulses is theoretically analyzed. We use a microscopic theory to describe laser induced structural changes and their influence on the electronic properties. We show that from the time evolution of the energ…