Materials Literature
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We measured the single-photon detection efficiency of NbN superconducting single-photon detectors as a function of the polarization state of the incident light for different wavelengths in the range from 488 nm to 1550 nm. The polarization contrast varies from ~5% at 488 nm to ~30% at 1550 nm, in good agreement with n…
The ground and first excited states of PaX(6)(2-) (X=F,Cl,Br,I), UX(6)(-) (X=F,Cl,Br) and NpF(6) are calculated using the spin-orbit complete active space perturbation theory at second order method and the g-factors are deduced. The isotropic g-matrix is built from first principles, and the g-factors are found to be n…
Morphology and deformation mechanisms and tensile properties of tetrafunctional multigraft (MG) polystrene- g -polyisoprene (PS- g -PI) copolymers were investigated dependent on PS volume fraction and number of branch points. The combination of various methods such as TEM, real time synchrotron SAXS, rheo-optical FTIR…
Substantial dipoles are formed at interfaces between metals and organic molecules, even in case of relatively weak interactions. We monitor interface dipoles by first-principles calculations of work function changes caused by adsorption of perylene and 3,4,9,10-perylene-tetra-carboxylic-dianhydride monolayers. These c…
Morphology variation: The Boc-alanine linked OPV exhibits an unprecedented formation of periodic macroporous honeycomb structures in chloroform and aligned fiber bundles in toluene (see SEM images). This represents a unique example for a distinct morphology change of an organogelator from macroporous honeycomb to alig…
The magnetization reversal in a single molecular magnet (SMM) weakly coupled to an electrode with spin-dependent splitting of chemical potentials (spin bias) is theoretically investigated by means of the rate equation. A microscopic mechanism for the reversal is demonstrated by the avalanche dynamics at the reversal p…
The ground state properties of three compounds, Cr 7 C 3 , Fe 3 C and Fe 2 B, are investigated using ab initio calculations based on density functional theory. Formation enthalpy values indicate that Cr 7 C 3 is the most stable crystal among the three compounds. Fe 3 C is metastable which has a positive heat of format…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Versatile Grafting-to Approach for the Bioconjugation of Polymers to Collagen-like Peptides Using an Activated Ester Chain Transfer AgentKerstin T. Wiss†, Ohm D. Krishna‡, Peter J. Roth†, Kristi L. Kiick*‡, and Patrick Theato*†Vie…
An important aspect of synthesizing designer nanostructures is fine-tuning their size, composition, and surface area. These parameters often dictate the unique properties of nanoparticles relative to their bulk counterpart. This paper reports the synthesis of porous metal nanorods with well-controlled dimensions, poro…
A series of thermo- and pH-dual responsive dendronized polymers PSADG1 − PSADG3 were successfully synthesized by attaching butylamide terminated poly(amidoamine) dendrons ( DG1 − DG3 ) to the alternating copolymers of styrene (St) and maleic anhydride (MAh). The structures and the molecular weights of the obtained pol…
Inelastic neutron, light, and x-ray scattering are used to investigate the vibrational density of states (VDOS) and the elastic properties of a sodium silicate glass as a function of temperature. The elastic moduli show the frequency and temperature dependence typical of anharmonic effects. The measured VDOS spectra,…
Microscopic chemical patterning of diamond surfaces by hydrogen and oxygen surface atoms is used for self-assembly of human osteoblastic cells into micro-arrays. The cell adhesion and assembly is further controlled by concentration of cells (2,500-10,000 cells/cm(2)) and fetal bovine serum (0-15%). The cells are chara…
Multi-platform software has been developed for the analysis of powder diffraction data, with particular focus on structure solution. The program provides a Rietveld optimization engine, with the possibility of refining parameters describing both the sample and the instrument model. Geometric constraints such as rigid…
By means of classical molecular-dynamics simulations, we investigate solid-solid phase transitions in cylindrical iron nanowires. The interatomic potential employed has been shown to be capable of describing the martensite-austenite phase transition in iron. We investigate the dependence of the transition temperature…
The understanding of biomineralization and realization of biology-inspired materials technologies depends on understanding the nature of the chemical and physical interactions between proteins and biominerals or synthetically made inorganic materials. Recently, combinatorial genetic techniques permit the isolation of…
In recent years, interest has grown in natural fibers as promising materials for a number of applications, particularly in polymer composite materials because they offer a number of advantages such as nontoxicity, eco-friendliness, combustibility, light weight, and low cost. Surface modification of Grewia optiva fiber…
Structural properties of the ${\text{AgSbTe}}_{2}{\text{-AgSbSe}}_{2}$ pseudobinary system were examined using thermal analysis, scanning electron microscopy, and x-ray powder diffractometry. It was found that partial substitution of Te by Se atoms leads to stabilization of the cubic crystal structure of alloys. The e…
The perspective of generating new colors commonly difficult to attain such as cyan blue and greens of various tones and saturations has motivated the design of conjugated polymer finely tuned in their molecular structure to reassemble the optical features desired in the context of non-emissive electrochromic device (E…
We investigate the assembly of colloidal ellipsoids in ac electric fields. Polystyrene latex ellipsoids with aspect ratios 3.0, 4.3, and 7.6 orient with the applied field and, at sufficient field strengths, interact to form particle chains at an angle with respect to the field. The characteristic chain angle decreases…
The use of a heterogeneous catalyst in the transesterification reaction of sunflower oil and waste oil for the production of methyl esters (biodiesel) has been studied. The basic hydrotalcite catalyst used showed a high activity for transesterification reactions in the operation conditions studied. The experiments wer…