Materials Literature
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We describe scanning tunneling spectroscopy (STS) measurements performed on individual cobalt (Co) atoms deposited onto backgated graphene devices. We find that Co adatoms on graphene can be ionized by either the application of a global backgate voltage or by the application of a local electric field from a scanning t…
Local magnetic ordering in artificial spin ices is discussed from the point of view of how geometrical frustration controls dynamics and the approach to steady state. We discuss the possibility of using a particle picture based on vertex configurations to interpret time evolution of magnetic configurations. Analysis o…
The quantum well solar cell (QWSC) is a p - i - n solar cell with quantum wells in the intrinsic region. Previous work has shown that QWSCs have a greater open circuit voltage (Voc) than would be provided by a cell with the quantum well effective bandgap. This suggests that the fundamental efficiency limits of QWSCs a…
Single crystals of the title compound, K(2)Al(2)P(8)O(24), were obtained by solid-state reaction. The monoclinic structure is isotypic with that of the Ga(III) analogue and is built of eight-membered phosphate ring anions P(8)O(24) (8-) (2/m symmetry) isolated from each other and further linked by isolated AlO(6) octa…
Experiments which determine the product of (W/e)air, the average energy deposited per coulomb of charge of one sign released by an electron coming to rest in dry air, and (LDelta/rho)Ca, the Spencer-Attix mean restricted mass collision stopping-power ratio for graphite to air, in a 60Co or 137Cs beam are reanalysed. C…
The interactions of low-energy (5-50 eV) electrons with acetylene-d(2) (C(2)D(2)) adsorbed on the Si(111)-(7x7) surface have been examined by monitoring the stimulated desorption products. These include primary cation desorbates, D(+) and C(2)D(2)(+) (C(2)HD(+)), the fragment ion C(2)D(+), smaller amounts of C(2)(+),…
A new Sb-based type-I clathrate family involving group 11 or 12 elements has been studied by density functional theory (DFT) calculations. The hypothetical Cu/Ag−Sb- and Zn/Cd−Sb-based compounds are studied in stoichiometry, site preference, and electronic structure. The transport properties of some of the energetical…
With the advent of structural genomics a variety of crystallization techniques have been automated and applied to high-throughput pipelines, yet seeding, which is the most common and successful optimization method, is still being performed predominantly manually. The aim of this study was to devise simple automated se…
The electronic structure and optical properties of the complex hydrides Ca2FeH6, Ca2RuH6, Mg2FeH6, Mg2RuH6, Sr2FeH6, Sr2RuH6 and Sr2OsH6 were studied using first-principles calculations. Optical spectra of the hydrides were compared with those of SiN x , In2O3 and ZnO determined from theoretical calculations and measu…
Abstract The investigations on the formation of mixed crystals of ammonium dihydrogen orthophosphate (ADP) and potassium dihydrogen orthophosphate (KDP) i.e. potassium ammonium dihydrogen phosphate, K 1‐x (NH 4 ) x H 2 PO 4 have been presented in this paper. Pure and mixed crystals of ADP and KDP have been grown by sl…
In this paper we discuss and interpret the results of shear bond strengths achieved after the use of two silane coupling agents with isocyanato functionality, viz. 3-isocyanatopropyltrimethoxysilane and 3-isocyanatopropyltriethoxysilane. The silanes were used alone and also blended with a non-functional cross-linking…
We have synthesized monodisperse “hairy rod oligomers” based on oligo( p -benzamide)s carrying alkyl side chains and conjugated them with polydisperse poly(ethylene glycol) (PEG) chains. The well-defined oligomers were synthesized from 4-amino-2-hexyloxybenzoic acid using a commercial peptide synthesizer. The PEG conj…
This study compares the effects of hollow polymeric microspheres (PHMS) on specific mechanical properties and thermal properties of glass, basalt, and carbon woven fabric reinforced vinyl ester composites. The specific flexural and specific impact strengths of the composites were marginally increased with the addition…
Detailed similarities between polarization states of light and ballistic charge carriers in graphene are derived. Based on these, the optical equivalent of quantum wavefunctions, the Dirac equation, and the effect of an electrostatic potential are found, and the quantum analogs of the refractive index of light and of…
Low-temperature heat capacity and oriented single-crystal field-cooled and zero-field-cooled magnetization data for the single-molecule magnet [Ni(hmp)(dmb)Cl](4) are presented that indicate the presence of ferromagnetic ordering at approximately 300 mK, which has little effect on the magnetization relaxation rates.
The effect of plasma treatments with oxygen and argon gases on some properties of polyamide 6 fibers is thoroughly investigated. The treated fabric with oxygen plasma is further treated with some metal salts solutions such as copper sulfate, nickel sulfate, and silver nitrate to study their effect on the antibacterial…
Reaction of the rigid angular ligand tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene, hereafter LH(4), with Mn(CH(3)CO(2))(2) x 2 H(2)O in a basic aqueous medium, in air, affords a crystalline product of composition Na(12){[Mn(H(2)O)](12)L(12)} x xH(2)O. Single-crystal X-ray diffraction reveals the prese…
The microwave transmission of arrays of square patches, each rotated by 45° from the axes of the square lattice on which they are positioned, has been experimentally studied as a function of metal occupancy. At low frequencies, the microwave transmissivity drops on passing through the connectivity threshold (50 per ce…
In the search for high-temperature thermoelectric materials, two families of novel, narrow-band-gap semiconducting antimonide oxides with the compositions RE(3)SbO(3) and RE(8)Sb(3-delta)O(8) (RE = La, Sm, Gd, Ho) have been discovered. Their synthesis was motivated by attempts to open a band gap in the semimetallic RE…
Harmonic force field (FF) parameters for the active site of native azurin (AZ) have been developed using density functional theory (DFT)-based Becke's three-parameter hybrid exchange functional and the Lee-Yang-Parr correlation functional (B3LYP) method. The same computational protocol has also been applied to derive…