Materials Literature
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Low-frequency Raman spectra of strong and fragile glass forming liquids were measured in a wide temperature range. From an analysis of the spectra and literature data it is found that the main difference in the dynamic structure factor is the ratio of vibrational to relaxational contributions: The stronger the glass f…
This is an extensively illustrated laboratory manual of transmission electron microscopy techniques for the technician, graduate student, or researcher. Chapters begin with a general discussion, move on to the chemicals and equipment required for the method being described and conclude with a step-by-step presentation…
A demonstration imaging spectrometer using a liquid crystal tunable filter (LCTF) was built and tested on a hot air balloon platform. The LCTF is a tunable polarization interference or Lyot filter. The LCTF enables a small, light weight, low power, band sequential imaging spectrometer design. An overview of the protot…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Chemical modification of proteins has been and continues to be an important biochemical tool for the study of protein structure and function. One such type of approach has been the reductive methylation of lysine residues. In order to address the consequences of such methylation on the crystallization and structural p…
Abstract Cardanol was functionalised to incorporate elements such as phosphorus and bromine and polymerised with formaldehyde or hexamethylenetetramine (HMTA) to get flame retardant polymers. Thus, monocardanyl phosphoric acid (MCPA), its bromoderivative (BrMCPA), and their formaldehyde condensates (MCPAF and BrMCPAF)…
The attenuation coefficients for hollow sapphire and lead-based, oxide glass waveguides are calculated using an approximate formalism from Marcatili and Schmeltzer [Bell Syst. Tech. J. 43, 1783-1809 (1964)]. These results are compared with an exact calculation, and the agreement is found to be excellent for bore diame…
We investigate experimentally the generation of hexagonal patterns of filaments in a laser beam traversing a thin liquid crystal cell placed in front of a single ‘‘virtual mirror.’’ This mirror is the image of a real mirror and is placed either in front of or behind the cell. The results clearly support the physical i…
A previously reported multistep hot filament chemical vapor deposition process for nucleating diamond directly on nickel substrates has been further refined to increase the nucleation density and improve the orientation of diamond films. The process employed heavy seeding of both 〈100〉 and 〈111〉 oriented single crysta…
Phase diagrams of a set of three monodisperse polystyrene lattices in the presence of non-adsorbing polymer molecules (hydroxyethyl cellulose) have been determined. Polymer molecules induce reversible phase transitions involving gas, liquid and solid-like states. We find that the phase diagrams can have two distinct t…
Abstract Biodegradable thermoplastic composites reinforced with wheat straw fibers were prepared. The matrix was an expensive polyester, poly‐3‐hydroxy‐butyrate (PHB), produced by bacterial fermentation. Before being mixed with the PHB, the wheat straw fibers were subjected to a steam explosion process that induces mo…
Thin film optical waveguides of the chalcogenide glass Ga-La-S have been deposited on substrates of CaF2 and microscope glass by the technique of pulsed laser deposition. The chalcogenide properties of photobleaching, photodoping, and photoinduced refractive index changes have been observed and preliminary experiments…
The photoluminescence of porous silicon can be quenched by adsorbates, and the degree of quenching can be tuned by chemical derivatization of the porous silicon surface. Thus, as-prepared porous silicon has a hydrophobic, hydrogen-terminated surface, and the photoluminescence is strongly quenched by ethanol and weakly…
The simple model previously suggested is extended to the case of three-site intermetallics like the Heusler compounds. The behaviour of the lattice parameter in several sequences of compounds can be qualitatively understood by considering the changes in the relevant d-(or p)-site occupation number.
Discussing the design and optimum use of thermal analysis instrumentation for materials' property measurement, this work details how the instruments work, what they measure, potential pitfalls and the fitting of experimental results to theoretical models. It presents a tutorial on writing computer programs for data ma…
Steady state and time-resolved photoluminescence studies have been carried out for a new vibronic emission band, with a zero phonon line at 2.395eV, that is observed in type IIb semiconducting diamond. This band exhibits a relatively slow (228ns) photoluminescence decay that is exponential, and is believed to be due t…
The title structure comprises two ion pairs in each asymmetric unit. There are no close contacts between any of the ions. Although the structure determination was carried out at reduced temperature there are large vibration amplitudes for some F atoms and disorder in one of the n-butyl chains
The title molecule, 2,7,12,17-tetrakis(4-chlorophenyl)-21,22,23,24-tetraazapentacyclo[16.2.1.1 3,6 1 8,11 .1 13,16 ]tetracosa-1,3(22),4,6,8,10,12,14,16(24),17,19-undecaene, is crystallographically centrosymmetric and the dihedral angle between the two pyrrole ring planes is 5.0 (4) o . The molecular structure is a con…
Ca 2 (SiO 3 OH)(OH), M r =190.26, orthorhombic, P2 1 2 1 2 1 , a=9.487 (4), b=9.179 (4), c=10.666 (7) A, V=928.8 (8) A, Z=8, D x = 2.72 g cm -3 , λ(Mo Kα)=0.71069 A, μ=25.07 cm -1 , F(000)=768, T=293 K, final R=0.054 for 1677 unique non-zero reflections having I>3σ(I). The crystal was hydrothermally synthesized from a…