Materials Literature
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We report here atomic force microscopy experiments designed to uncover the nature of failure mechanisms occuring within the process zone at the tip of a crack propagating into a silica glass specimen under stress corrosion. The crack propagates through the growth and coalescence of nanoscale damage spots. This cavitat…
Spectroscopic data demonstrate that impurity D/A levels in doped semiconductor nanostructures are energetically pinned, resulting in variations in D/A binding energies with increasing quantum confinement. Using magnetic circular dichroism spectroscopy, the donor binding energies of Co2+ ions in colloidal ZnSe quantum…
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We have performed 0.5-micros-long molecular dynamics (MD) simulations of 0%, 50%, and 100% acetylated third- (G3) and fifth-generation (G5) polyamidoamine (PAMAM) dendrimers in dipalmitoylphosphatidylcholine (DPPC) bilayers with explicit water using the coarse-grained (CG) model developed by Marrink et al. (J.Phys. Ch…
Abstract New host lattice materials whose red phosphors for white LEDs have been investigated in the ternary system Ca 3 N 2 –AlN–Si 3 N 4 , just as Ca 2 Si 5 N 8 and CaSiN 2 :Eu were found in the binary system Ca 3 N 2 –Si 3 N 4 . A new red phosphor of CaAlSiN 3 :Eu which is effectively excited by blue‐GaN and near U…
We demonstrate the fabrication of 2-D arrays of nanopillars made from perfluoropolyether derivatives using a porous anodic aluminum oxide membrane as a template. Pretexturing the aluminum prior to anodization enables one to engineer multiple morphological length scales and thereby synthesize a lotus-leaf-like topograp…
The dendritic architecture applied to peptides provides a practical entry into globular macromolecules resembling proteins. A modular design was chosen using a divergent synthesis on solid support alternating proteinogenic alpha-amino acids with branching diamino acids, producing peptide dendrimers with a molecular we…
In this study, we describe composite scaffolds composed of synthetic and natural materials with physicochemical properties suitable for tissue engineering applications. Fibrous scaffolds were co-electrospun from a blend of a synthetic biodegradable polymer (poly(lactic-co-glycolic acid), PLGA, 10% solution) and two na…
Poly(vinyl pyrrolidone) (PVP) has been extensively used in the solution-phase synthesis of many types of colloidal particles, where it is mainly considered as a steric stabilizer or capping agent with a major role to protect the product from agglomeration. In a recent study, we discovered that the hydroxyl end groups…
The production of nanoparticles (NPs) is increasing rapidly for applications in electronics, chemistry, and biology. This interest is due to the very small size of NPs which provides them with many interesting properties such as rapid diffusion, high specific surface areas, reactivity in liquid or gas phase, and a siz…
Polymer composite films were prepared on the basis of poly(vinyl ethylal) doped with a low concentration of an anionic polymethine dye that absorbs light in the near IR region and a higher concentration of 2,4,5,7-tetranitro-9-fluorenone or tetrakis(benzylamino)octahydrofullerene organic acceptor. The photoconductivit…
Abstract: The Early Tithonian ammonite genus Semiformiceras represents a lineage that lasted almost 3 myr. Previously, a gradual, anagenetic evolutionary pattern has been proposed on the basis of both biostratigraphic data and the interpretation of morphological changes in successive species, subspecies or morphotypes…
The composition of the polyethylene surface upon treatment in an oxygen plasma and its afterglow was studied by attenuated total reflectance IR spectroscopy and X-ray photoelectron spectroscopy. The oxidation of the surface at the lowest destruction rates was attained upon simultaneous action of excited O2(a1Δg) and g…
This paper reports on the development and optical analysis of Tb3+‐doped polyvinyl alcohol (PVA) films. A reference PVA film has also been prepared for which X‐ray diffraction (XRD) spectral profile has been carried out; it was found that this polymer possesses a semi crystalline nature. Spectral analysis of the Tb3+:…
Gamma‐ray irradiations induced various alterations in sulfur‐ and selenium‐based chalcogenide glasses. The absorbed dose was in the range of 0.01–3.6 MGy. The glasses exhibit prominent sensitivity to γ‐ray irradiation, characterized by changes in some of the physical properties of the glasses, e.g., optical transmissi…
The specific heat of Sm 0.55 Sr 0.45 MnO 3 manganite is measured in the vicinity of the ferromagnetic phase transition in strong magnetic fields up to 15 T. An anomalous critical behavior of the Sm 0.55 Sr 0.45 MnO 3 ferromagnet in magnetic field is predicted and experimentally observed. The anomalous behavior manifes…
Instrumented indentation was combined with microscopy and spectroscopy analysis to investigate the local mechanically induced ferroelectric to anti‐ferroelectric phase transformation of niobium‐modified lead zirconate titanate 95/5. Indentation experiments to a depth of 2 μm were performed using a Berkovich pyramidal…
The effect of the processing variables shear rate, solids loading, and sintering temperature on the anisotropy of sintering shrinkage of aqueous tape‐cast alumina was studied. Higher shear rates and higher solids loading resulted in higher in‐plane shrinkage anisotropy, whereas the shrinkage anisotropy in the thicknes…
We develop the monomer, a molecular statics technique for the search of transition states under conditions of relatively complex atomistic environments. As its counterpart from the literature, the dimer, our method is based on forces evaluation alone and is able to find the saddle configuration without previous knowle…
Magnesium imidazolate: trans-diaquabis(imidazole-4-carboxylato-κ 2N,O)-magnesium(II) Mg(C4H3N2O2)2(H2O)2 crystallizes in the monoclinic system (space group P21/c). The structure is composed of monomeric molecules, each containing a Mg(II) ion located at the inversion centre and chelated by two imidazole-4-carboxylate…