Materials Literature
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A new scheme for the estimation of aggregate chemical potential and hardness is introduced and compared with the results of ab initio calculations for the aggregates as well as with the results obtained by employing various other combination schemes. Numerical results show that this new scheme provides better estimate…
A deep ultra-violet (UV) laser beam recorder (LBR) with 248 nm wavelength was developed to realize a high-density disk. The characteristics of the LBR are the wavelength and the multifunctional design. Among the possible laser wavelengths, 248 nm is the shortest wavelength applicable with Novolac photoresist, and the…
Neste trabalho, foram confeccionadas chapas aglomeradas, utilizando gesso como material cimentante e papel reciclável dissociado (jornal e offset) e partículas de madeira de pinus como reforços. Em todos os tratamentos, a razão madeira (ou fibras) para gesso foi mantida em 0,25 (base seca) e duas dosagens de água (w)…
The adsorption of nitrous oxide (N 2 O) on silicalite-1 has been investigated using a volumetric method. The adsorption isotherms are for the first time reported at temperatures in the range of 273 K to 398 K and at pressures up to 120 kPa. The Langmuir isotherm appropriately fits the equilibrium data. The thermodynam…
A new successful short time synthesis route for the preparation of FSM is developed using the leached natural aluminosilicate saponite, in combination with a low concentration of cetyltrimethylammoniumbromide [C 16 H 33 N + (CH 3 ) 3 Br - or CTMA] as surfactant. The leaching of the smectite increases with higher acid…
Formation of cobalt-encapsulating carbon nanotubes/nanoparticles from the decomposition products of Co(CO) 3 NO was investigated by carrying out the reaction in a specially arranged closed cell at different temperatures. Multiwalled carbon nanotubes along with carbon-encapsulated cobalt nanoparticles were generated vi…
We describe the recording characteristics of discs having Ge doped eutectic SbTe alloy recording films with various compositions. The recording characteristics are fairly sensitive on the film composition. For our recording condition, the Sb/Te ratio of around 4 and the Ge content of about 5 at.% were preferable to ob…
Laser-ablated Os and Ru atoms react with CO 2 molecules upon cocondensation in excess argon at 7 K and neon at 4 K. Besides the dominant neutral products [OMCO, O 2 MCO (M = Os, Ru), O 2 Os(CO) 2, and OCRu(O 2 )CO], anionic species [OMCO - (M = Os, Ru)] are also formed and identified through annealing, ultraviolet irr…
The interaction between supported Rh I (CO) 2 Cl species, prepared by metallo-organic chemical vapor deposition (MOCVD) of [Rh(CO) 2 Cl] 2 to hydroxylated γ-Al 2 O 3, and NO has been investigated using time-resolved, energy dispersive extended X-ray absorption fine structure (EDE)/mass spectrometry (MS) and diffuse re…
The excitation energy transfer rates between the excited states of a Tb(III) complex containing the ligand 1-phenyl-3-methyl-4-(trimethylacetyl)pyrazol-4-one, are described. Energy transfer rate constants are derived from time-gated and time-correlated single photon counting measurements. Comparison with the analogous…
The generation of photoelectrical effects through the spectral sensitization of wide band gap (SnO 2 ) nanostructured semiconductor electrode by the excitation of a novel porphyrin−fullerene ( P − C 60 ) dyad is reported. P − C 60 was synthesized from 5-(4-amidophenyl)-10,15,20-tris(4-methoxylphenyl) porphyrin ( P ) l…
The reaction of the bis-chelating ligand 1,2-bis(2,2'-bipyridine-6-yl)ethane (L) with the trinuclear species of formula [Mn(3)O(O(2)CR)(6)(py)(3)](ClO(4)) (R = Me (1); R = Et (2); R = Ph (3)) has afforded the new tetranuclear mixed-valent complexes [Mn(4)O(2)(O(2)CR)(4)L(2)](ClO(4))(2) (R = Me (4); R = Et (5); R = Ph…
The crystal structures of phase-change materials, GeTe–Sb 2 Te 3 and Ag–In–Sb–Te compounds, crystallized by laser irradiation, have been investigated for several years. These investigations revealed that these two compounds crystallize into a single phase with a cubic or a pseudo-cubic structure as the structural unit…
Mixtures of a properly chosen oil (poly(dimethylsiloxane) (PDMS) or hydrocarbon) and hydrophobic particles (e.g., hydrophobized silica) have a strong deteriorating effect on foam stability, even when introduced in a very low concentration. These mixtures are widely used for foam control and are commonly termed antifoa…
The combustion kinetics of a laminate with intumescent behavior were determined by thermogravimetry for heating rates between 5 and 20 K/min and a final temperature of 873 K. The devolatilization stage consists of three consecutive first-order reactions that can be associated with the release of (1) water vapor (from…
The synthesis, electrochemistry, and optical spectroscopy of an extensive series of cofacial bis[(porphinato)zinc(II)] compounds are reported. These species were synthesized using sequential palladium-catalyzed cross-coupling and cobalt-mediated [2+2+2] cycloaddition reactions. This modular methodology enables facile…
Polyelectrolyte microcapsules (PEMCs) have been prepared by coating red blood cells with the polyelectrolytes poly(styrenesulfonate), poly(allylamine hydrochloride), and dextran sulfate applying the layer-by-layer technique with subsequent dissolution of the core. The capsule permeability for human serum albumin (HSA)…
Mössbauer and Raman spectroscopies, calorimetric measurements, the LIESST effect (light induced excited spin state trapping) and dynamics of the high-spin (HS) to low-spin (LS) relaxation have been investigated in order to thoroughly study the spin-crossover compounds of formula {Fe(L)[H 2 B(pz) 2 ] 2 }, where L = 2,2…
Organized monolayer films of a manganese tetraphenylporphyrin have been prepared and used as supported oxidation catalysts. Manganese 5,10,15,20-tetrakis(tetrafluorophenyl-4'-octadecyloxyphosphonic acid) porphyrin (1) has been immobilized as a monolayer film by a combination of Langmuir-Blodgett (LB) and self-assemble…
On the basis of the possibility that there might exist a mixed composition of the Y(As,Nb,P,V)O 4 system of better luminescent performance than the single-compound phosphors at the VUV excitation, a solution combinatorial chemistry synthesis and characterization was employed in the present investigation. Quaternary an…