Materials Literature
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New temperature-dependent inelastic X-ray scattering (IXS) and Raman scattering (RS) data are compared with each other and with existing inelastic neutron scattering (INS) data in vitreous silica, in the 300-1775 K region. The IXS data show collective propagating excitations up to Q = 3.5 nm−1. The temperature behavio…
This paper reports the observation of large undamped voltage oscillations during the anodic polarization of silicon in electrolyte containing a combination of acids. One of them stimulates oxide growth and the other its chemical dissolution (in the present case, . This temporal patterning of the anodization process is…
Preservation of laminations in hemipelagic and pelagic sediments is routinely attributed to reduced oxygen conditions that inhibited benthic activity. As such, the degree of preservation of laminae is used commonly as a paleo-oxygenation indicator. Recent evidence from deep-sea pelagic sediments in the eastern equator…
X-Ray diffraction is reported from mesoporous silicate films grown at the air/water interface. The films were studied both as powdered films, and oriented on silicon or mica sheets. At early stages of growth we observe Bragg diffraction from a highly ordered cubic phase, with both long and short d-spacing peaks. We ha…
The synthesis, optical and electrical properties of azobenzene-substituted polythiophene derivatives at the 3-position are reported: one without flexible spacer (PT0) and the other with a hexamethylene spacer (PT6). Photoirradiation of PT6 at 366 nm caused trans-cis isomerization of the azobenzene moiety and this phot…
The complex [Cd3(dien)2(NCS)6]n·nH2O (dien = diethylenetriamine) is prepared and characterised by X-ray diffraction studies, which show a new type of three-dimensional polymeric structure having cadmium centres which are linked to each other via NCS bridges in such a way that two types of Cd environment (one involving…
Intercalated layered double hydroxides (LDHs) of chromate (CrO42–) and dichromate (Cr2O72–) have been synthesised and characterised. The parent chloride material ([Ni–Al–Cl]) was obtained by coprecipitation at constant pH and further anion-exchanged to incorporate the desired oxo-anions. The physico-chemical propertie…
Measurements of partial discharge (PD) are used to examine the insulation characteristics of HV equipment. This test method is also suitable for low-cost components in mass production. To monitor the quality of prefabricated parts, products and production processes, short test cycles and automatic classification are i…
This paper presents an alternative method for the identification of the d-axis parameters of a synchronous machine. The first part of the paper describes a multiple input multiple output (MIMO) broadband excitation and measurement method which is more time efficient than the standard standstill frequency response (SSF…
We have determined the three-dimensional solution structure of the complex of Lactobacillus casei dihydrofolate reductase and the anticancer drug trimetrexate. Two thousand seventy distance, 345 dihedral angle, and 144 hydrogen bond restraints were obtained from analysis of multidimensional NMR spectra recorded for co…
Five experimental two-component phase diagrams between orientationally disordered crystals (ODICs) have been established from the low-temperature phase to the liquid state using thermal analysis and X-ray powder diffraction techniques. The high-temperature orientationally disordered phases for the pure components, whi…
Using optical microscopy, we studied magnetic-field-induced structures in a confined ferrofluid emulsion where the magnetic field is applied quickly as a step function. Columnar, bent-wall-like, and labyrinthine structures in three dimensions are observed, corresponding to disks, ``worms,'' and branchlike patterns in…
The low temperature fluorination of low dimensional mixed metal oxides can be achieved in a variety of ways to provide new structures and modified electronic characteristics. The potential of these methods for the synthesis of new materials is considered, with particular reference to the fields of copper oxide superco…
The preparation of Sn-doped SiO 2 glasses with different Sn contents (Sn/(SiO 2 + SnO 2 ) ratio 0.01 to 10.0% w/w) was performed by two sol–gel routes. The first route (method A) used tin(IV) tert-butoxide as the tin precursor and in the presence of acetylacetone it resulted in transparent glasses with a maximum tin c…
The surface isoelectric point for native air-formed oxide films on various metals has been determined by measurement of contact angles at the hexadecane/ aqueous solution interface as a function of the pH of the aqueous phase. Application of Young's equation, the Gibbs equation, and surface equilibria conditions for h…
In this study, we synthesized a biomaterial whose surface inhibits non-specific protein and cell attachment. The polymer was designed to mimic the external cell plasma membrane properties through the introduction of particular chemical constituents of the cell membrane: phospholipid polar headgroups. This was done by…
A technique for calibrating the charge quantity using the pulsed electroacoustic (PEA) method is described in this paper. The space charge calibration technique is shown to depend on the electric and acoustic properties of the samples when the standard signal for calibration is obtained from the sample itself. Moreove…
The controlled calcination of the chromium containing polyhedral oligosilsesquioxane (c-C5H9)7Si7O9- (OSiMe3)O2CrO2, 3b, monitored by MS analysis of the evolved gases and thermogravimetry measurements, led to the formation of a microporous Cr–Si–O amorphous mixed oxide containing 10.2 wt.% of chromium. The textural pr…
This paper summarizes our research effort in developing polyimides functionalized with nonlinear optical chromophores for applications in second order nonlinear optical devices. In the past several years, we have developed several general synthetic approaches to these materials. Detailed physical characterization indi…
N-Alkyl-p-nitroanilines from the propyl to the octyl derivative are synthesised and characterised. Powder SHG studies show that the butyl derivative alone is active, in agreement with earlier observations. Crystal structures of the propyl, butyl and pentyl derivatives are determined; the propyl and pentyl derivatives…