Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of phosphate esters: .alpha.-keto phosphates as a photoprotecting group for caged phosphateRichard S. Givens, Phillip S. Athey, Bogdan Matuszewski, L. William Kueper III, Jieyou Xue, and Thomas FisterCite this: J. Am. Chem. Soc. 1993, 115, 14, 6001–6012Publica…
There is recent evidence that united atom CH2 Lennard-Jones nonbonded potentials commonly used for molecular dynamics simulations for liquid polymers such as polyethylene are inadequate in some important respects. In the present work a united atom potential incorporating an offset of its center from the carbon atoms (…
Transparent and crackfree SrTiO3 thin films were deposited on silicon wafers, fused silica, and stainless-steel substrates by sol-gel technique. Strontium ethyl hexanoate and titanium isopropoxide were used as starting materials. The surface topology of the films were studied by electron micrography and the structural…
We investigate the phase diagram of two-dimensional binary mixtures of hard dises. There are two parameters in the problem, the ratio r of the radii of the two dises, and the concentration p of smali dises. We determine the possible phases by trying different periodic structures and minimizing the area per particle of…
Are conducting polymers commercially viable? In the first part of a two‐part article the attributes of conducting polymers which make them attractive for the development of new products are reviewed. In the second part (next month) products based on conducting polymers will be discussed in detail.
The patterned covalent surface addition of a monoamine to fluorinated ethylene propylene films (FEP) controls both cellular attachment and differentiation in defined media conditions. A radio frequency glow discharge (RFGD) process was used to replace FEP surface fluorine atoms with hydroxyl groups. The primary amine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrafast photoinduced electron transfer between porphyrinic subunits within a bis(porphyrin)-stoppered rotaxaneJean Claude Chambron, Anthony Harriman, Valerie Heitz, and Jean Pierre SauvageCite this: J. Am. Chem. Soc. 1993, 115, 14, 6109–6114Publication Date (Print):July 1,…
Holes are often drilled in a panel for cooling or fastening. For a panel made of a monolithic ceramic, such a hole concentrates stress, reducing load-carrying capacity of the panel by a factor of 3. By contrast, for a ductile alloy panel, plastic flow relieves stress concentration so that the small hole does not reduc…
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Homonuclear and heteronuclear 2D NMR methods are used to study two triple-helical peptides. One peptide, (POG)10, is considered to be the most stable prototype of a triple helix. The second peptide, (POG)3ITGARGLAGPOG(POG)3 (denoted T3-785), was designed to model an imino acid poor region of collagen and contains 12 r…
Physical properties of zinc oxide films deposited by dual-ion-beam sputtering are analyzed to point out the performance of this technique for the deposition of this material. The films are deposited by sputtering a zinc oxide target with an argon-ion beam, while a second low-energy beam, the assistance ion beam, impin…
A perovskitelike solid solution ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ can be viewed as a hole-doped Mott-Hubbard insulator or strongly correlated metal that is derived from the parent insulator ${\mathrm{YTiO}}_{3}$ with the Mott-Hubbard gap of \ensuremath{…
A reservoir of 9 electrons and 27 protons, complex 1 has 8±1 quasi-equivalent redox centers. It is prepared from [CpFe(η6-mesitylene)]+ by nonaallylation of the three methyl substituents, demetalation, conversion into the corresponding nonaol, and phasetransfer-catalyzed reaction with [CpFe(FC6H4Me)].
Carbon nitride (CNx) thin films were prepared by dc magnetron sputtering of a graphite target in a nitrogen ambient onto Si(100) substrates held at ambient temperatures. The films are amorphous with a small volume fraction of nanocrystallites. All CNx coatings grown to a thickness of 1.5 μm are adherent and smooth. Na…
Thermal expansion coefficients (α a and α c ) in two crystallographic axes ( a and c ) of the tetragonal phase are measured at 25°–1200°C in ZrO 2 –M 2 O 3 (M = Sc, In, Yb) and in ZrO 2 –YTaO 4 . The difference between these two thermal expansion coefficients, α c –α a , decreases with M 2 O 3 or YTaO 4 composition ev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultifunctional macrocyclic ligands. Synthesis and characterization of nickel(II) and cobalt(II) macrocyclic-catechol complexes and their dimeric, antiferromagnetically coupled, semiquinone derivativesDimitri Coucouvanis, Sigridur G. Jonasdottir, Danae Christodoulou, Chang G…
Under actual reactor conditions, the mechanical characteristics of nuclear fuel are particularly affected by thermal expansion of the fuel pellets. The results of an experiment studying the vibration behavior of nuclear fuel under reactor conditions are presented. The experiment was conducted in an experimental reacto…
The lifetime of luminescence in NaCl:${\mathrm{Yb}}^{2+}$ crystals has been investigated using a streak-camera method. Two emission bands peaking at 400 and 432 nm (called bands I and II, respectively) are observed. In addition to a long lifetime of more than 0.3 ms previously observed for band II, it was observed tha…
The cells of the extreme thermophile Thermus thermophilus are surrounded by a regular layer (S-layer) built up by a protein with an apparent molecular mass of 100 kDa (P100). From purified membrane fractions, three different class of two-dimensional crystals can be obtained by following alternative extractive procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic liquid crystals in polypeptides with mesogenic side chains. 1Junji Watanabe and Toshihiko TominagaCite this: Macromolecules 1993, 26, 15, 4032–4036Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993htt…