Materials Literature
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Abstract In this study, oligo‐2‐hydroxy‐1‐naphthaldehyde (OHNA) was synthesized from the oxidative polycondensation of 2‐hydroxy‐1‐naphthaldehyde (HNA) with air oxygen, NaOCl, and H 2 O 2 in an aqueous alkaline medium at 50–95°C. We determined the products and the oxidative polycondensation reaction conditions of HNA…
Abstract Fullerene nanowire arrays with well‐defined size and length have been prepared by a controllable technique. Fullerene molecules such as C 60 are introduced into the pores of anodic aluminum oxide (AAO) templates under a direct current (DC) electric field and polymerized in the pores. Structure analysis shows…
Abstract The anionic polymerization of lauryllactam was initiated at 270°C using sodium hydride as an initiator and N , N ′‐ethylene‐bisstearamide (EBS) as an activator (NaH:EBS molar ratio of 2). Polymerization occurred in less than 2 min and was successfully performed in an internal mixer and a twin‐screw extruder w…
Abstract Dissolution of cellulose in aqueous hydroxide offers a procedure for regeneration of cotton or wood celluloses. The aqueous NaOH system for dissolving cellulose seems to have considerable potential for fiber production and also as a medium for preparing cellulose derivatives. Reactions with phosphoric and pho…
Large quantities of extremely fine aragonite needles (see Figure, top image) have been synthesized at room temperature at an expanding liquid–liquid interface in a radial Hele–Shaw cell. By simple variation of the experimental conditions, hollow, cylindrical aragonite/calcite crystals (see Figure, bottom image) may al…
To simulate the processes that take place at the polypyrrole/water interface under different states of oxidation of the polymer, a reliable model of the polymer/water system is necessary. To this end, a model with atomic detail of the polypyrrole/water system was simulated for first time in both the oxidized (charged)…
The novel charge-transfer ground state found in alpha,alpha'-diimine adducts of ytterbocene (C(5)Me(5))(2)Yb(L) [L = 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen)] in which an electron is spontaneously transferred from the f(14) metal center into the lowest unoccupied (pi*) molecular orbital (LUMO) of the diimi…
Reaction of the nickel(II) complex of an inverted porphyrin, (5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrinato)nickel(II) (1), with haloalkanes in the presence of proton scavengers yields 21-C-alkylated complexes. The products are separated and characterized spectroscopically. Chirality of the formed substituted meta…
All-silica beta zeolite is shown to be effective for MTBE removal from water. The silica beta was prepared directly from gel, and it was more effective than dealuminated beta for MTBE adsorption. Water and 2-propanol adsorption isotherms showed that the all-silica beta is more hydrophobic than dealuminated beta. The a…
LaTiO3 is known as a Mott insulator which orders antiferromagnetically at T(N)=146 K. We report on results of thermal expansion and temperature dependent x-ray diffraction together with measurements of the heat capacity, electrical transport measurements, and optical spectroscopy in untwinned single crystals. At T(N)…
Encapsulation of molybdenum oxide MoO 3 into ordered mesoporous silica materials is demonstrated using different synthetic routes. Either supramolecular polyoxometalates of the “Müller type” or Na 2 MoO 4 were used as precursors. Molybdenum oxide (MoO 3 )−silica hybrid materials were characterized using nitrogen-sorpt…
Noble gases (Ar, Kr, and Xe) were trapped in an amorphous carbon matrix in the 1--11-GPa pressure range. Extended and near-edge x-ray-absorption spectroscopies indicate clustering of noble gases induced by the host matrix internal pressure. Simultaneously, the matrix pressure promotes a shift of the noble-gas core-lev…
Shape Memory Alloys (SMA) are a unique type of material characterized by two properties that ordinary metals do not exhibit: Shape Memory Effect (SME) and pseudoelasticity. SMAs can be actuated mechanically and/or thermally, and these properties have already been exploited in a wide variety of engineering applications…
C 1 symmetry and C –H···O and C –H···O hydrogen‐bond donor/acceptor ability of the title phase π‐donor are expressed by a glide plane ( a ± c /2 repetition), uniform stacks, and a band structure quarter‐filled with holes. Conductivity and spin susceptibility data demonstrate strong Mott localization at ambient pressur…
Review of yarn production Textile products and fiber production Common principles Filament yarn production Carding and prior processes for short-staple fibers Sliver preparation Short-staple spinning Long-staple spinning Post-spinning processes Staple systems and modified yarn structures Quality and quality control Ec…
Measurement of the variation of the N\'eel temperature ${T}_{N}$ with pressure P and the compressibility \ensuremath{\kappa} of the orbitally ordered $\mathrm{Mn}(\mathrm{III}){\mathrm{O}}_{3}$ array of the $R{\mathrm{MnO}}_{3}$ family $(R=\mathrm{L}\mathrm{a},\mathrm{P}\mathrm{r},\mathrm{S}\mathrm{m})$ and of the $\m…
We describe the potentiodynamic preparation and subsequent characterization of poly[Ni(3-MeOsaltMe)] films (surface concentration, 3 < Γ/nmol cm - 2 < 350) in acetonitrile media. Coulometric and gravimetric (electrochemical quartz crystal microbalance, EQCM) data allow one to monitor the deposition process and show th…
The structure and spin-crossover magnetic behavior of [Fe(II)1(6)][BF(4)](2) (1 = isoxazole) and [Fe(II)1(6)][ClO(4)](2) have been studied. [Fe(II)1(6)][BF(4)](2) undergoes two reversible spin-crossover transitions at 91 and 192 K, and is the first two-step spin transition to undergo a simultaneous crystallographic ph…
Thin films of polystyrene‐ block ‐poly(methyl methacrylate) (PS‐ b ‐PMMA) are prepared in which the cylindrical PMMA microdomains are oriented normal to the substrate. When the PS block is crosslinked, pores with tailored diameters ranging from 3 nm to ∼ 8 nm, are generated at the center of PMMA microdomains (see Figu…
This work investigates surface modification of calcium hydroxyapatite (CaHAP) with organophosphonic acids (RP(O)(OH) 2 ). The solution-phase reactions of RP(O)(OH) 2 (R = n -C 8 H 17, n -C 18 H 37, and n -C 8 F 17 (CH 2 ) 2 ) were studied with two types of CaHAP substrates: high surface area powder ( S N 2,BET = 60 m…