Materials Literature
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For more than three decades, measurement of terrace width distributions (TWDs) of vicinal crystal surfaces have been recognized as arguably the best way to determine the dimensionless strength $\tilde{A}$ of the elastic repulsion between steps. For sufficiently strong repulsions, the TWD is expected to be Gaussian, wi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTControlling Photoinduced Electron Transfer within a Hydrogen-Bonded Porphyrin−Phenoxynaphthacenequinone Photochromic SystemAndrew J. Myles and Neil R. BrandaView Author Information Department of Chemistry, University of Alberta Edmonton, AB, Canada T6G 2G2 Cite this: J…
In frameworks of the macroscopic dynamic theory of coherent interfaces in crystals the acoustic radiation of coherent boundary at passage along it of localized wave packages is considered. It is shown that the coherent twin boundary of acoustic waves does not radiate.
An easy to implement and powerful method for the solution of 3D scattering problems that can be well described by Helmholtz equation is presented. The matrix algebra used provides excellent stability versus the number of junctions as well as great computational speed. The matrix truncation method yields an easy single…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNew Biomedical Poly(urethane urea)−Layered Silicate NanocompositesRuijian Xu, Evangelos Manias, Alan J. Snyder, and James RuntView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, and Dep…
SUMMARY Two new, recent diatoms, Stephanodiscus suzukii Tuji et Kociolek and Stephanodiscus pseudosuzukii Tuji et Kociolek are described from Lake Biwa, Japan, where they had been identified previously as Stephanodiscus carconensis Grunow var. carconensis and S. carconensis var. pusillus Grunow, respectively. These fo…
The surface morphologies of orthorhombic and trigonal trypsin crystals grown from solution were investigated by in situ atomic force microscopy. {001} and {100} faces of trigonal and {110} faces of orthorhombic crystals grew strictly by two-dimensional (2D) nucleation. For {101} faces, no 2D nucleation was observed ev…
Enzymatic adsorption and degradation of three types of aliphatic polyester films and two types of polyolefin films by the extracellular PHB depolymerase from Alcaligenes faecalis T1 have been studied by using a quartz crystal microbalance (QCM) technique. Hydrolysis of poly[(R)-3-hydroxybutyrate] was quantitatively fo…
Electrostatic Lens Systems: Second Edition enables readers to design lens systems for focusing beams of charged particles that have useful characteristics. The book covers the basic theory of the motion of charged particles in electrostatic fields and describes several methods for the calculation of the potential and…
The interfacial structures of biphenyl (BP), benzoic acid (BA), and 4-biphenylcarboxylic acid (BPCA) on a Au colloid monolayer surface were investigated using surface-enhanced Raman scattering (SERS). The absence of the C−H stretching vibrational mode in the SERS spectrum of BP indicated that the two benzene rings of…
New quasi-universal melting-temperature scalings for transport coefficients in Yukawa systems are presented which test well, and up to T / T M ≳100, against the recently obtained large body of accurate computer simulation data on self-diffusion and shear viscosity.
An investigation into the anion dependence of the network-forming ability of metal complexes of hexamethylenebis(acetamide), CH3CONH(CH2)6NHCOCH3 (HMBA), has resulted in the X-ray characterization of the compounds [Co(HMBA)3][Co(NCS)4], 1, [Nd(HMBA)3][Nd(NO3)6].2CHCl3, 2, [Co(HMBA)3][HgCl4], 3, and [Mn(HMBA)3][HgBr4].…
Magnetotransport properties of quasi-two-dimensional thallium purple bronze were measured at different magnetic fields for H ∥ c . Huge positive magnetoresistance below the Peierls transition T P and Shubnikov-de Haas oscillation in the high-field range were found. In the charge-density-wave (CDW) state below T P , no…
The electrical resistivity and Hall effect for a single crystal of Tm 2 Fe 14 B have been measured over the range of temperature ( T ) from 4 to 600 K in magnetic fields of up to 5 T. The resistivity exhibits a small step-like rise at the spin-reorientation temperature T s , which is 311 K, and a broad minimum at 535…
A three-dimensional array of gold nanoparticles has been assembled on a nanostructured TiO 2 template by subjecting the colloidal gold suspension to a dc electric field (50−500 V). By controlling the concentration of gold colloids in toluene and the applied voltage, it is possible to control the thickness of nanostruc…
The combined effect of finite potential barriers and the dielectric mismatch between dot and matrix on excitonic properties of semiconductor quantum dots has been studied. To avoid the unphysical divergence in the self-polarization energy which arises for the simplest and profusely adopted step-like model of the diele…
Porphyrin and pyrene photoactive cores have been encapsulated within an isolating polymeric shell using an efficient and general strategy based on the use of dendritic initiators for the ring-opening polymerization of epsilon-caprolactone to yield functional core star polymers. The isolation of the core functionalitie…
A theoretical study of structural and electronic properties of boron compounds BN, BP, BAs and BSb is presented, using the full potential linearized augmented plane wave method. In this approach, the generalized gradient approximation was used for the exchange-correlation potential. Ground state properties such as lat…
Based on a simple model for ordering of hexagons on square planar lattice, an attempt has been made to consider possible structure of C(_{60}) fullerite in its low temperature phase. It is shown that hexagons, imitating fullerens oriented along (C_{3}) axes of \emph{sc} lattice, can be ordered into an ideal structure…
We present a critical theoretical study of electronic properties of silicon nanoclusters, in particular the roles played by symmetry, relaxation, and hydrogen passivation on the the stability, the gap states and the energy gap of the system using the order-N [O(N)] non-orthogonal tight-binding molecular dynamics and t…