Materials Literature
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The novel steroid-bridged energy transfer system 2 was prepared starting from epi -androsterone. The linkage of both the anthrylthienyl and the bithienyl group in the 3- and 17-position of the steroid was achieved by Grignard reaction of the respective carbonyl function of the steroid component. The synthesis was acco…
Both fundamental and practical aspects of ceramic joining are understood well enough for many, if not most, applications requiring moderate strengths at room temperature. This paper argues that the two greatest needs in ceramic joining are for techniques to join buried interfaces by selective heating, and methods for…
Broadband antireflection coatings on ZnSe substrates are designed and manufactured in the 3.5-16-mum IR range. The thin-film materials are YF(3) and ZnS produced by electron-beam deposition. To reach optimal performances to as great as 16 mum, we performed an accurate determination of complex indices, taking into acco…
A study of photoinduced ${\mathrm{Ta}}^{4+}$ centers in nominally pure ${\mathrm{KTaO}}_{3}$ single crystals has been carried out by electron-spin resonance. Two of these centers $({\mathrm{Ta}}^{4+}\ensuremath{-}{V}_{\mathrm{O}}$ and ${\mathrm{Ta}}^{4+}\ensuremath{-}{V}_{\mathrm{O}}\ensuremath{-}{\mathrm{Me}}^{4+})$…
Abstract Recent developments in polymer builders and specialty polymers (i.e., soil shield and soil release agents, dye transfer inhibitors) for detergents are reviewed. Attention focuses on polycarboxylates as detergent processing auxiliaries as well as detergent actives under low‐temperature washing conditions.
The effect of deposition temperature and growth rate on the bond structure of hydrogen free carbon films has been investigated. A sharp transition temperature of the sp3 content of the carbon films as a function of deposition temperature has been reported several times. The value of this transition temperature has var…
The cruciform-type specimen is preferable to cylindrical-type one to perform biaxial tensile test. Therefore, a cruciform-type specimen having some slots in four arms was used to determine biaxial property of carbon-carbon (C/C) composites. The strain (or stress) distribution in center area and the stress state of the…
Transition temperatures of binary mixtures of the two series, 4-hexadecyloxyphenyl-4- substituted benzoates (Ia-d) and 4-substituted phenyl-4-hexadecyloxybenzoates (IIa-d), have been determined on cooling and the phase diagrams compared with those previously obtained on heating. Tc values for the monotropes and the no…
Solid films composed principally of carbon and nitrogen were grown on a variety of substrates at ambient temperature in a flow-tube reactor by upstream mixing of cyanogen azide, cyanogen, or cyanogen halides with active nitrogen obtained from an electrical discharge. Ab initio calculations and dependence of deposition…
In this work, the efficiency of starch acetylation to reduce water sensitivity of hydrophilic materials was investigated. Starch acetate was either included in foamed starch trays and/or used to coat these trays, wheat gluten based films or paper sheets. The water sensitivity of these foamed trays (quantity and kineti…
Die ternären Bismut(II)-chalkogenometallate(III) Bi2M4X8 mit M = Al, Ga und X = S, Se wurden aus den binären Chalkogeniden M2X3 und Bi2X3 sowie elementarem Bismut synthetisiert. Alle Verbindungen sind diamagnetische Halbleiter mit Eg (opt.) = 1.8–2.7 eV. Sie sind bis auf Bi2Al4Se8 thermodynamisch stabil und zerfallen…
Synthetic, structural and luminescence studies of stoichiometric crown ether compounds of Mn(2+) in well-defined coordination environments were undertaken in an effort to understand the origin of emitting crystal defects found in cubic F23 [(K18C6)(4)MnBr(4)][TlBr(4)](2) crystals (Fender, N. S.; et al. Inorg. Chem. 19…
Ceramic joining has been recognized as one of the enabling technologies for the successful utilization of ceramic components in a number of demanding, high temperature applications. Various joint design philosophies and design issues have been discussed along with an affordable, robust ceramic joining technology (ARCJ…
Variable-angle spectroscopic ellipsometry was used to determine nondestructively the porosity depth profile and thickness of thin porous silicon layers produced by anodization of p(+)-doped silicon wafers. A porosity graded-layer model is presented and used in the analysis of the material. In the porosity graded-layer…
This paper reviews the work performed by the authors on the preparation of LnTO3 (Ln = rare earth elements, and T = transition metals) perovskite-type oxides by the thermal decomposition at low temperatures of the corresponding heteronuclear complexes. Bimetallic complexes in the series Ln[Fe(CN6)]·nH2O and Ln[Co(CN6)…
Single crystals of CuTh(2)Te(6) form by a stoichiometric reaction of the elements at 1000 degrees C. The compound crystallizes in the space group -P2(1)/m with unit cell parameters a = 6.170(2) Å, b = 4.332(1) Å, c = 10.424(3) Å, beta = 98.85(1) degrees, and Z = 1 at 113 K. The structure was solved from single-crystal…
Hydrogen embrittlement (HE) of grade 2 and grade 3 titanium was investigated in 6% sodium chloride (NaCl) at pH 1 under potential control at 70°C. Grade 2 titanium was, at most, slightly susceptible to HE under the test conditions, whereas grade 3 titanium was very susceptible at an electrochemical potential below −80…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDifferential Binding of Iron(III) and Zinc(II) Protoporphyrin IX to Synthetic Four-Helix BundlesR. Eryl Sharp, James R. Diers, David F. Bocian, and P. Leslie DuttonView Author Information The Johnson Research Foundation Department of Biochemistry and Biophysics Univers…
Structural (x-ray and neutron diffraction), Mössbauer, and magnetic investigations were performed in order to study Mn, Co, and Ni substituted Fe3.34Ge2 hexagonal germanides. From an x-ray diffraction analysis of Fe3.34Ge2 single crystal data Fe was found to enter exclusively 2a and 2d sites of the defective structure…
Etch rates ⩾5000 Å min −1 were obtained for Cu in electron cyclotron resonance discharges at a sample temperature of 200°C for ion‐neutral ratios ⩾0.02. The rates are a strong function of ion‐neutral ratio, ion flux, and ion energy through the need to have desorption rate faster than the , generation rate in order to…