Materials Literature
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The preparation of racemic and optically active glyceric acid de rivatives as suitable precursors for the formulation of a new class of bioerodible and/or biodegradable polymers is described. Details are provided for the prepa ration of chiral 3-0-alkyl substituted methyl glycerates and on their potential to form the…
Abstract Thermogravimetric analysis (TGA), in which the mass of a sample is monitored as a function of temperature, is one of the oldest analytical techniques used in clay mineralogy. One of the first applications to the study of minerals was reported in 1903 by Nernst and Riesenfeld. Since then, TGA has been used to…
Infrared spectra of NO, NO2 and CO adsorbed on Rh/Al2O3 have been recorded in order to identify the role of surface Rh—NO+ species in the reactions of NO and CO on Rh surfaces. Rh—NO+ was generated by thermally activated adsorption of NO, adsorption of NO on oxidised Rh or by adsorption of NO2. The latter also gave ad…
A series of novel binuclear cobalt(II) complexes containing the µ-hydroxo-bis(µ-carboxylato)-dicobalt(II) core have been prepared where each cobalt(II) centre is capped by the tridentate macrocycle N,N′,N″-trimethyl-1,4,7-triazacyclononane (L, C9H21N3): [CoII2(µ-RCO2)2L2(µ-OH)]PF6[R = Me (1); ClH2C (2), or Cl2HC (3)].…
In this paper, we study a tight-binding Hamiltonian for codimension one quasicrystals by means of a new numbering which orders the sites according to their environment. This includes the general 1D quasiperiodic chain. We exhibit exact extended wave functions on approximants for the general quasiperiodic chain, for wh…
A study has been made of the effect of hydrogen on the shape memory effect and transformation behavior of Ti-Ni alloy. The material was evaluated in the temperature range from 300 to 473 K using a bent specimen. The transformation behavior was analyzed by differential scanning calorimetry (DSC) and X-ray diffraction t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR, XRD, and DRS studies of paramagnetic titanium(3+) ions in a colloidal solid of titanium oxide prepared by the hydrolysis of titanium trichlorideAkira Ookubo, Eiji Kanezaki, and Kenta OoiCite this: Langmuir 1990, 6, 1, 206–209Publication Date (Print):January 1, 1990Publi…
The mechanisms of hydrogen-induced losses in silica-based fibers due to reaction are analyzed, and novel experimental results are presented. The mechanisms of hydrogen reaction with a glass structure were studied and found to be divided into two groups. One was responsible for the reaction with glass networks, not def…
The efficacy of magnetic albumin microspheres in the targeted delivery of an anti-cancer agent, doxorubicin hydrochloride, has been investigated in rats. Using the tail as a target organ, the animals were intra-arterially administered with either 0.12 mg/kg of free drug, or 0.04 mg/kg of microsphere entrapped drug in…
The distribution of added potassium (K) in soil K forms (water-soluble, exchangeable, and nonexchangeable) as a function of clay mineralogy and taxonomy was determined using 102 soils from the continental United States and Puerto Rico, representing 10 soil orders. The soils were divided into three groups (kaolinitic,…
Abstract The kinetics of the enzymatic hydrolysis of regenerated cellulose fibers before and after acid prehydrolysis has been investigated. This pretreatment changes the kinetics from a monophasic to a biphasic first order reaction. Prolonged acid prehydrolysis increases the proportion of the enzymatically easily hyd…
Abstract Blends of β‐polypropylene with elastomers have been prepared under laboratory and processing technological conditions. As a result of the elastomer addition the temperature interval favourable for the formation of the β‐modification became narrower. Blends have spherulitic structure like pure β‐PP. The elasto…
Recent results of a study of the deposition process and the technological development of laser-arc are presented. Studies of the influence of arc current on film deposition were carried out for Ti, TiC, and C. On the basis of these results, specific multilayered structures have been prepared. As an example, a Ti/TiC m…
The effects of the dianions (A2–) of d-, l- and meso-tartaric acids on the dissolution reaction which takes place between calcite and the corresponding monoanions (HA–) has been investigated: (a) by using channel-electrode shielding measurements and (b) through the characterization of the resulting dissolution etch-pi…
With the objective of modifying the micromeritic properties of tolbutamide (i.e., to manufacture a highly functional powder form), particle design was attempted using a quasi-emulsion solvent diffusion (QESD) method, and the micromeritic properties and dissolution rate of the obtained spherical agglomerates were evalu…
The chemical composition and morphology of corrosion products accumulated on the internal surfaces of admiralty brass tubes and in pits, formed during service of a power plant condenser cooled with brackish water, were examined and compared with corrosion products formed under laboratory conditions simulating those in…
A new chelating macrocycle, 1,5,9-triazacyclododecane-N,N’,N’’-triacetiacc id (DOTRA), has been synthesized, and its complexes \nwith Zn2’, Cd2+, Ca2+, Mg2+, and Mn2+ have been examined by potentiometry and NMR spectroscopy. The first protonation \nconstant of the free ligand (log K, = 12.8) was determined spe…
A crystal-state structutal analysis of pBrBz-(Aib-LAla)5-OMe tetrahydrate and pBrBz-(Aib-L-Ala)6-OMe dihydrate has been performed by X-ray diffraction. The decapeptide and dodecapeptide molecules are both basically α-helical with five and seven 1 â†� 5 intramolecular H-bonds, respectively. A similarity between the two…
The long sought after [2,2]azobenzenophane 1 has been prepared quite simply by reduction of l,2-bis(4-nitrophenyl)ethane. According to 1H-NMR and UV/VIS spectra the CNNC moiety in 1 is noticeably bent. Photochemically generated cis,cis-1 isomerizes 10000 times more slowly to the trans,trans-form than does the cis,t…
Liposomes can be produced by a variety of techniques such as sonication, high-pressure homogenization, detergent dialysis, reverse-phase evaporation and ether injection. The Microfluidizer is a high-pressure homogenizer which is capable of making small size multilamellar vesicles. The mean vesicle size of the liposome…