Materials Literature
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O elevado teor de matéria orgânica dos Organossolos confere-lhes características edáficas próprias, que podem ser contrastantes em relação ao observado em solos minerais. Devido à forte interação entre a matéria orgânica e os elementos a ela adsorvidos, os métodos de rotina em fertilidade do solo podem não avaliar de…
The carbonyl-ruthenium substituted undecatungstosilicate [alpha-SiW(11)O(39)Ru(II)(CO)](6-) () was isolated as a caesium salt and successfully characterized by using (183)W and (13)C NMR, elemental analysis, IR, UV-vis and cyclic voltammetry (CV). Polyanion represents the first example of a metal-carbonyl moiety being…
3-Arylthiochromone derivatives were synthesized as new photolabile protecting groups, in which the photoreactivity was switchable based on oxidation of the sulfur atom (sulfide and sulfone); the protected substrates , released the corresponding alcohols, amines or carbonxylic acids almost quantitatively under UV-light…
Si(100) surfaces were molecularly engineered by covalent linkage of a monolayer of two stilbene-based chromophores, either 1-cyano-1-phenyl-2-[4′-(10-undecenyloxy)phenyl]-ethylene or its chlorine derivative, 1-cyano-1-(4-Cl-phenyl)-2-[4′-(10-undecenyloxy)phenyl]-ethylene. The hybrid systems have been probed by monochr…
In this work, we have explored new stable structures of the Au32Z (Z = +1, 0, -1) clusters. Theoretical calculations using density functional theory within the generalized-gradient approximation were performed. Our results show that, in the anion state (Au32-), low-symmetry (disordered) structures are preferred over t…
The ionic conductivity of Sn 0.9 In 0.1 P 2 O 7 ceramic was investigated under various atmospheres within the temperature range of 130 – 230 ° C . Similar to mixed-conductive perovskite oxides at high temperatures (such as Sr Ce 0.95 Yb 0.05 O 3 − α , La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 − α at 600 – 1000 ° C ), Sn 0.9 In…
EDOT-capped sigma3-phosphole self-rigidifies due to an unprecedented P-O interaction and can be electropolymerised affording functionalizable polymers.
Experimental evidence was produced and gathered to demonstrate the distinct nature of nanostructured polymer microcomposites. The case of a polymer composite consisting of a high-content of micrometric quartz with a small adjunct of nanoclay is discussed. Emphasis is put on dielectric behavior studies while some resul…
This paper describes the growth of polypyrrole (PPy) layers over polystyrene (PS) nanofibers via a vapor phase polymerization process. PS nanofibers were produced through electrospinning of PS solutions containing chemical oxidants capable of polymerizing pyrrole monomers. The electrospun PS nanofibers provided a robu…
Low-energy electron microscopy (LEEM) has been used to measure reflectivity of low-energy electrons for graphene layers grown on Si-terminated 6H-SiC(0001) and 4H-SiC(0001) substrates and C-terminated 4H-SiC(000-1) substrates. We observe quantized oscillations in the reflectivity on all the substrates. The number of g…
A helical water chain, reversibly inlayed in a magnesium imidazole-4,5-dicarboxlylate, was characterized by single-crystal X-ray diffraction, thermogravimetric analysis, as well as temperature-variable Fourier transform infrared spectroscopy and powder X-ray diffraction techniques.
A genuine example of non-aggregated highly fluorescent binuclear phthalocyanines is reported; spectroscopic studies and computations revealed that the two halves of trifluoroethoxy-coated binuclear phthalocyanine are rotated in the same directions so as to contact each other as much as possible.
Varying polarity of the solvent leads to the formation of vesicles, planar networks or rod-like objects by the spontaneous self-assembly of a simple C(3)-radial oligophenylene ethynylene amphiphile.
Photochromic thieno[3,2-b]thiophenes and dithieno[3,2-b:2',3'-d]thiophene with photo-switchable luminescence properties have been synthesized using a Suzuki cross-coupling reaction; their electronic structures, and photochromic and luminescence behaviour have also been studied.
OBJECTIVE: Polycaprolactone (PCL) microparticles coated with acetylated collagen have been assessed for use as a controlled drug delivery system. METHOD: The surface morphology, drug encapsulation and release profile of PCL microparticles and collagen-coated PCL microparticles containing doxycycline hydrochloride (DH)…
The synthesis and magnetic properties of the compounds [HNEt(3)][Fe(2)(OMe)(Ph-sao)(2) (Ph-saoH)(2)].5MeOH (1.5MeOH), [Fe(3)O(Et-sao)(O(2)CPh)(5)(MeOH)(2)].3MeOH (2.3MeOH), [Fe(4)(Me-sao)(4)(Me-saoH)(4)] (3), [HNEt(3)](2)[Fe(6)O(2)(Me-sao)(4)(SO(4))(2)(OMe)(4)(MeOH)(2)] (4), [Fe(8)O(3)(Me-sao)(3)(tea)(teaH)(3)(O(2)CMe…
We have studied the adsorption of alpha-lactalbumin at a planar poly(acrylic acid) (PAA) brush using neutron reflectometry (NR) and total internal reflection fluorescence (TIRF) spectroscopy. The PAA brush has been prepared by spin-coating silicon or quartz plates with a hydrophobic poly(styrene) film and by transferr…
Novel dendritic trityl radicals (DTR1 and DTR2) with a TAM radical core, PAMAM branching and carboxylate exterior surface exhibit high stability towards oxidoreductants as evidenced by their electrochemical and EPR properties, offering potential application as dual oxygen and pH probe.
Novel mixed amido/imido/guanidinato complexes of niobium are reported. The complexes were synthesized by insertion of two equivalents of di-isopropylcarbodiimide (i-Pr-cdi) or bis-cyclohexylcarbodiimide (Cy-cdi) respectively, into the niobium-amido bonds of [Nb(NR(2))(3)(N-t-Bu)] (, R = Me; , R = Et) starting out from…
A fascinating new series of structures in which 4-crossing [2]-catenane motifs are formed between pairs of interpenetrating 2D sheets; moreover, the inclined orientation of the two interpenetrating nets with a layer leads to the wrapping of helical chains of one net around zigzag chains of the other.