Materials Literature
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Pulsed versus continuous wave plasma polymerization of perfluorocyclohexane is compared as a function of duty cycle off-time, on-time, and peak power. The chemical composition of the deposited films has been determined by X-ray photoelectron spectroscopy (XPS). A greater retention of the chemical structure associated…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSecond-Harmonic Generation by Spontaneous Self-Poling of Supramolecular Thin Films of an Amylose−Dye Inclusion ComplexOh-Kil Kim, Ling-Siu Choi, He-Yi Zhang, Xue-Hua He, and Yan-Hua ShihView Author Information Chemistry Division, Naval Research Laboratory Washington, D…
Abstract Effects of the rare‐earth ions on some properties of a lithium‐zinc ferrite used in high frequency are described. A set of seven compounds with formula Li 0.3 Zn 0.4 Fe 1.96 R 0.04 O 4 where R Yb, Er, Dy, Tb, Gd, Sm and Ce, were prepared by the classical method. The obtained results reveal that, by introduc…
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…