Materials Literature
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Viscoelastic properties of model poly(dimethylsiloxane) networks with pendant chains composed of linear molecules of known and uniform molecular weights are studied. It was found that the loss modulus ( G‘‘ ) of these networks depends on the concentration and the molecular weight of the dangling chains. The dependency…
Patterns in the cyanide stretching frequencies have been examined in several series of monometal- and CN - -bridged transition metal complexes. Metal-to-cyanide back-bonding can be identified as a major factor contributing to red shifts of ν CN in monometal complexes. This effect is complicated in cyanide-bridged comp…
Phthalazine adsorbed on colloidal silver surfaces is found to convert photochemically to a product in which the N N bond of the molecule likely breaks to form an adsorbed species resembling an ortho-substituted benzene. The photochemical kinetics was studied using a simple flow cell. The photochemical rate constant wa…
The oxothio polyanions gamma-[SiW(10)M(2)S(2)O(38)](6)(-) (M = Mo(V), W(V)) were obtained through stereospecific addition of the dication [M(2)S(2)O(2)](2+) (M = Mo, W) to the divacant gamma-[SiW(10)O(36)](8)(-) anion in dimethylformamide. These compounds were isolated as crystals and are stable in usual organic solve…
K. Bowden and E. J. Grubbs, Chem. Soc. Rev., 1996, 25, 171 DOI: 10.1039/CS9962500171
Phosphonate additives have important applications both in biomineralization processes and in industrial mineral scale formation. The kinetics of crystal growth of hydroxyapatite (HAP) has been investigated in the presence of seven phosphonate additives: HEDP (hydroxyethylenediphosphonic acid), DETPMP (diethylenetriami…
After intravenous (i.v.) injection, colloidal drug carriers such as liposomes, emulsions, polymeric or solid lipid nanoparticles immediately interact with plasma proteins. The adsorbed plasma protein patterns depend on physico-chemical characteristics of the carriers' surface and are regarded as a key factor for the i…
Five cis-cycloalkenes, with ring sizes 5, 6, 7, 8 and 10, and a cis–trans mixture of cyclododecene have been oxidised by iodosylbenzene using iron(III) or manganese(III) tetra(2,6-dichlorophenyl)porphyrin as catalysts. Both catalysts give very similar product distributions, although the reactions with the manganese po…
A highly sensitive, convenient, direct spectroscopic method for the measurement of stability constants of Eu 3+ ion complexes of multidentate ligands is described. Eu 3+ ion complexation is monitored by means of 7 F 0 → 5 D 0 excitation spectroscopy. The method involves the competition against one another, of two liga…
Electrochemical and structural characterization of glassy carbon (GC) electrodes exposed to the plasma conditions necessary to nucleate and grow diamond have been performed for the first time. The electrodes are referred to as diamond-coated (DGC) if the surface was exposed to a CH 4 /H 2 plasma and as hydrogenated (H…
The miscibility, morphology, and biodegradability of binary blends of poly[( R )-3-hydroxybutyric acid] (P[( R )-3HB]) ( M n = 300 000) with poly(ε-caprolactone- co -lactide) (P(CL- co -LA)) ( M n = 1500−40 000) have been studied by means of differential scanning calorimetry (DSC), optical microscopy, scanning electro…
The influence of molybdenum and nitrogen on passivation of the nickel-bearing austenitic stainless steels (SS) Fe-20% Cr-20% Ni, Fe-20% Cr-20% Ni-6% Mo, and Fe-20% Cr-20% Ni-6% Mo-0.2% N in deaerated 0.1 M hydrochloric acid (HCl) +0.4 M sodium chloride (NaCl) was investigated using electrochemical and x-ray photoelect…
The aggregation characteristics of aqueous solutions of a positively charged nitroxide surfactant (CAT16) in the presence and absence of half-generation polyamidoamine starburst dendrimers ( n .5-SBDs) have been investigated by electron paramagnetic resonance (EPR). Computer simulation of the EPR spectra allowed the c…
The reaction of aqueous solutions of K 2 PdCl 4 and K 3 Co(CN) 6 results in gellike polymeric materials, characterized by bridging cyanides between the central metals of the adducts. These materials tend to be rigid in nature but contain in excess of 95% water by weight. We refer to these novel transition metal based…
An Sn-substituted mesoporous silica molecular sieve (SN–HMS), prepared by neutral amine surfactant assembly of silicon and tin(IV) alkoxide precursors at ambient temperature, shows exceptional promise for producing poly(L-lactic acid) with polydispersity values near 1.1.
The surface compositions of La0.8Sr0.2BO3 (B = Cr, Mn, Fe, Co or Y) were investigated by X-ray photoelectron spectroscopy (XPS). Among the five solid oxide solutions, the yttrium showed the highest concentration in the surface atomic ratio [B-ion(La + Sr)]. Furthermore, the O1s spectra characteristics of yttrium perov…
The theoretical analysis of the steady-state amperometric response for a polymer-modified electrode system whcih exhibits Michaelis–Menten kinetics is discussed. In particular, the interplay between substrate diffusion within the polymer matrix and substrate reaction at the catalytic polymer sites is examined. A non-l…
The practical application of Pockels voltage and field sensors to electric power networks is expected to continue to increase not only in Japan but also throughout the world, with the introduction of optical telecommunication technology.
Ultradispersed diamond (UDD) powder prepared by explosive detonation and modified by hydrogen, plasma-ionized hydrogen, nitrogen, methane and air, as well as in vacuo, under different temperatures is investigated by Fourier-transform infrared spectroscopy (FTIR) and temperature programmed desorption (TPD) methods. Aft…
Constant energy molecular dynamics simulations of silicon cluster growth have been conducted for clusters up to 480 atoms using the Stillinger−Weber empirical interatomic potential. It is found that the interior atoms of the 480-atom clusters, at the temperatures used, show bulklike characteristics. The cluster bindin…