Materials Literature
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Soluble materials placed inside opened SWNTs can be contained using fullerenes to block the ends, thereby providing a way to remove the excess of external soluble material present in the initial product formed by low temperature filling of open-ended single wall carbon nanotubes; the C60-blocked filled SWNTs can then…
A micro-stratified 3D scaffold was designed by successive stacking of alginate gel layers (AGLs) and poly(l-lysine)-hyaluronic acid (PLL-HA) multilayer films. AGLs are obtained by complexation of alginate by Ca2+ ions. Alginate solutions are first sprayed onto a solid substrate inclined such that the excess of solutio…
Hybrid silica nanotubes with chiral aromatic rings in the walls were prepared using self-assemblies of a low molecular weight amphiphile as a template; transmission electron microscopy images of the nanotubes at different formation steps showed that the co-structure-directing agent plays an important role in this chir…
This investigation presents a novel method for modifying multiwalled carbon nanotubes (MWCNTs). The morphology, electrical resistivity, and percolation threshold of MWCNT/Polyimide nanocomposites were studied. Acid‐modified MWCNTs reacted with (3‐aminopropyl)triethoxysilane by ionic bonding, and were then mixed with p…
The dynamic mechanical properties of treated sisal fiber-reinforced polyester composites fabricated by resin transfer molding (RTM) have been studied with reference to fiber surface modifications, frequency and temperature. The sisal fibers have been subjected to various chemical and physical treatments like merceriza…
We report a scalable fabrication of novel, food-grade anisotropic micro-rods from shellac and ethyl cellulose with controllable morphology which was studied using scanning electron microscopy and optical microscopy. The aqueous suspensions of these anisotropic materials show great potential for preparation of super-st…
We studied the deformation properties of single Pickering-emulsion droplets using a combination of Scanning Force Microscopy (SFM) in force spectroscopy mode and Reflection Interference Contrast Microscopy (RICM). The droplets were made from an oil-in-water emulsion system which was stabilized by cowpea mosaic virus (…
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.