Materials Literature
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This paper offers direct evidence for the electrochemical intercalation of oxygen in an oxide with the K 2 NiF 4 structure, namely, La 2 CuO 4, at room temperature. Organic solvents, as well as water, allow that reaction to occur. The charge-to-mass ratio evaluated from a comparison with fluoride intercalation implies…
A synthetic strategy has been developed to afford porphyrins site-derivatized with the same hydrogen-bond synthon attached directly to the macrocyclic ring. Porphyrin homologues derivatized at the β and meso positions with an amidinium group form 1:1 supramolecular complexes with benzoate acceptors and show notable di…
The reaction of mu-nitrido[((tetraphenylporphyrinato)manganese)(phthalocyaninatoiron)], [(TPP)Mn-N-FePc], with I(2) in THF develops with the formation of two different species, i.e., [(THF)(TPP)Mn-N-FePc(H(2)O)](I(5)).2THF (I) and [(TPP)Mn(IV)-N-Fe(III)Pc](I(3)) (II). On the basis of single-crystal X-ray work and Möss…
Approximate density functional theory has been used to investigate changes in the geometry and electronic structure of the mixed oxo- and carboxylato-bridged dimers [Mn(2)(mu-O)(2)(O(2)CH)(NH(3))(6)](n+)and [Mn(2)(mu-O)(O(2)CH)(2)(NH(3))(6)](n+)in the Mn(IV)Mn(IV), Mn(III)Mn(IV), and Mn(III)Mn(III) oxidation states. T…
A novel three-dimensional network, Mn(N3)2(pzdo), bridged by azido and pzdo (pzdo = pyrazine−dioxide) has been synthesized and structurally and magnetically characterized. It possesses a cubic-like structure and shows an antiferromagnetic ordering at higher temperature (62 K) and a spin−flop transition.
FeSO 4 ·7H 2 O was precipitated with ammonia solution in the presence of H 2 O 2 as an oxidant. The precipitate was washed slightly with deionized water and then peptized with acetic acid (ca. 60 mol %) to attain a homogeneous sol. Iron oxide films were fabricated by spin-coating the sol onto ITO-coated glass substrat…
Field-induced migration of low surface tension polystyrene- b -poly(dimethyl siloxane) (PS- b -PDMS) block copolymer additives in a polystyrene (PS) host was investigated using a series of narrow molecular weight distribution polystyrenes (5 × 10 3 < M w,PS < 2 × 10 7 g/mol). Dynamic contact angle analysis (DCA) and a…
A general synthetic route to gallium alkoxide complexes involving reactions of gallium tris(dimethylamide) with alcohols was developed and gallium oxide films were prepared by using a gallium alkoxide complex as the precursor in a chemical vapor deposition process. The complex [Ga(NMe 2 ) 3 ] 2 reacted with i -BuOH an…
Chiral azobenzene compounds were prepared. A cholesteric phase was induced by mixing each azobenzene compound in a host nematic liquid crystal. A twisting power of the chiral azobenzene compounds was dependent on the distance between an azobenzene moiety and chiral moiety. The twisting power of the chiral azobenzene c…
The effect of colloidal silica fillers on the cross-linking behavior of a model UV-curable polymer system (thiol−ene) is studied using in situ rheology and real-time FTIR spectroscopy. The validity of the Winter−Chambon criterion (convergence of the loss tangents at the gel point) is examined for the cross-linking of…
The spin crossover system, [Fe(bzimpy)(2)](ClO(4))(2).0.25H(2)O, was reinvestigated above room temperature (bzimpy = 2,6-bis(benzimidazol-2-yl)pyridine). The system exhibits an abrupt low-spin to high-spin transition at T(c) = 403 K. Liberation of a fractional amount of water does not affect the spin crossover: the sy…
Water-dispersible, isolable thiolate-stabilized platinum nanoparticles are synthesized by two one-phase methods: one is conducted in water; another mainly in methanol, through the reduction of chloroplatinic acid with sodium borohydride, using mercaptosuccinic acid (MSA) as the stabilizer. The well-separated particles…
Carbon nanotubes were prepared and investigated as sorbents for NO, SO 2, and CO 2 in the presence of O 2 . The preliminary results indicate that they are a good and reversible sorbent for NO removal at room temperature. An uptake amount of 78 mg/g of NO x was obtained by TGA when the carbon nanotubes were exposed to…
This paper describes the development and application of scaling laws relating bulk-degradation behavior of poly(lactic acid)−poly(ethylene glycol)−poly(lactic acid) (PLA- b -PEG- b -PLA) copolymer hydrogels to the ever-changing transport properties during network degradation. Specifically, the relationships developed…
A vibrational analysis has been carried out to analyze the chain conformation of poly(lactic acid) in the crystalline state. In conjunction with a normal-coordinate analysis, the Raman spectrum has yielded data regarding conformational distributions. Raman spectra of different helices were simulated using previously p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-Angle X-ray Scattering of PolymersBenjamin Chu and Benjamin S. HsiaoView Author Information Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400 Cite this: Chem. Rev. 2001, 101, 6, 1727–1762Publication Date (Web):May 19…
Abstract Wax‐coated old corrugated containers (OCC) are not part of the paper recycling stream because a process to remove the wax coating is not presently available. Residual waxes influence fiber–fiber bonding, reducing the paper properties of recycled OCC as well as the paper machine operating efficiency. A procedu…
Abstract Sorption measurements are executed to study the sorption behavior of propylene in a semicrystalline polymer. Decreasing values for the Flory–Huggins interaction parameter with increasing temperature are obtained. Large deviations are found, especially at higher temperatures, compared to data from the literatu…
The deactivation pathways of the singlet excited state of a series of zinc or free-base donor porphyrins covalently linked by a bridge to a paramagnetic iron(III) chloride porphyrin acceptor have been studied. These donor-bridge-acceptor systems all share a similar geometry (25 A donor-acceptor center-to-center distan…
Attractive materials for molecular electronics are the polycyclic aromatic hydrocarbons (PAHs), the hydrogen-terminated segments of a graphitic plane. Since the processing of larger PAHs, for example hexa-peri-hexabenzocoronene, is complicated by their extremely low solubilities and very small vapor pressures, the pos…