Materials Literature
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An analysis of the calorimetric data and X-ray structure and fluorescence characteristics revealed the existence of a linear correlation between the enthalpies of solution of saddle-shaped nonplanar porphyrins (H 2 P) in various solvents and the parameters of molecule nonplanarity in the crystalline state and in solut…
We synthesized complexones based on tetrapyridylporphin ( I ), namely, tetra(pyridinium-4-N-carboxymethylene) porphin tetrachloride ( II ), tetra(pyridinium-4-N-carboxymethylene)porphin tetrabromide ( III ), complete ethyl ester of (pyridinium-4-N-carboxymethylene)porphin tetrachloride ( IV ), and tetra(pyridinium- 4-…
Microphase separation is readily achieved in both PS-b-PEO diblock copolymer thin films and in PS homopolymer/PS-b-PEO polymer blends via solvent annealing. In situ synthesis of PS homopolymer with a symmetric PS-b-PEO diblock copolymer results in a cylindrical structure rather than a predicted lamellar morphology for…
A highly refractive sulfur-containing photosensitive polyimide (PSPI) based on the PI from 4,4'-[p-thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA) and 4,4'-thiodianiline (SDA), 4,4'-methylenebis[2,6-bis(methoxymethyl)phenol] (MBMP) as a cross-linker, and (5-propylsulfonyloxyimino-5H-thiophen-2-ylidene)-(2-meth…
The new biodegradable polyester poly(3-hydroxybutyrate-co-3-hydroxyhexnoate) (PHBHHx) has a potential application in tissue engineering. The aim of this study was to present a deeper picture of the relationship between the cellular behavior and the surface characteristics of PHBHHx films. The pristine PHBHHx film was…
A number of new silica fillers have been obtained in the emulsion system and changes in their surface properties appearing as a result of modification with the following alkoxysilanes have been evaluated: [3-(phenylamino)propyl]trimethoxysilane (PhAPS), (3-glycidoxypropyl)trimethoxysilane (GPS), N-2-(aminoethyl)-3-ami…
When the bulking promoter is added to pulp slurries at the wet end, the additive behaves like surface-active agent and partially prevents the formation of interfiber bonds in the handsheet. Therefore, an increase in paper thickness at the same basis weight could be performed. The tensile strength of the handsheets var…
The precipitation of strontium sulfate from aqueous solutions in the presence of polyphosphonates at 0.7 mol l-1 sodium chloride and 25°C has been studied. Over a range of relative super-saturation (2.0 - 6.2) the process appears to follow a surface controlled precipitation mechanism which is markedly inhibited by the…
The objective of this paper is to describe the current state of the art of the research on Ultra High Temperature Ceramic materials with particular reference to their space applications, and also to report on the activities performed on UHTC in the past decade by the Italian Aerospace Research Centre in the specific t…
Tantalum pentoxide thin films are prepared by oblique angle electron beam evaporation. The influence of flux angle on the surface morphology and microstructure is investigated by scanning electron microscopy (SEM). The Ta2O5 thin films are anisotropic with highly orientated nanostructure of slanted columns. The porous…
As culturas de banana e arroz são predominantes na região Nordeste do Estado de Santa Catarina e no caso da banana chegam a gerar 200 toneladas/ano de resíduos entre, pseudocaules, engaços e folhas, que geralmente são incorporados ao solo. Desta forma, este trabalho teve como objetivo avaliar a influência da adição de…
Resistive-type humidity sensors using polyaniline blend films were fabricated, and their long-term stability upon application of dc voltage was investigated. The use of blended films of electron-conducting polyaniline (PANI) and polystyrene was effective in depressing the sensor drift caused by polarization and/or ele…
El Atshan area, situated in the central Eastern Desert of Egypt, is a good location for studying the influence of high- and low-T alterations on the formation of Zr- and U-bearing minerals within a trachyte sill. These minerals are mainly represented by an unidentified secondary Zr-rich silicate mineral, betafite, and…
Collagen, the most abundant protein in mammals, constitutes a quarter of the animal's total weight. The unique structure of fibrous collagens, a long triple helix that further associates into fibers, provides an insoluble scaffold that gives strength and form to the skin, tendons, bones, cornea and teeth. The ready av…
Nanocomposites with polyurethane matrix filled with non-modified silica or silica modified with isocyanate groups were prepared in situ, in polymerization processes. Nanoparticles dimensions were evaluated on the basis of Zeta potential changes (Fig. 2, 3). The structures of nanosilica (Fig. 1) and nanocomposites obta…
Polyimides are widely used as spacecraft external surfaces materials. They are exposed to atomic oxygen (AO), which is the main constituent of a residual atmosphere at low Earth orbit (LEO) and should be protected from the space harsh environment. This work presents an innovative approach to applying a protective coat…
The investigation enables us to draw a conclusion that THPS has very good stabilising properties, which allows its use for intensifying the process of chromium tanning by decreasing the consumption of chromium and, at the same time, increasing the shrinkage temperature of the leather. The treatment of pelt with THPS i…
We built the quasicrystal structures which are five-fold，eight-fold，ten-fold and twelve-fold rotational symmetric artificially，and measured their drag-reduction in the mixed solution of water and glycerin by viscometer. We found the twelvefold symmetric structure has a drag-reduction of 15%—9% when shear rate is 200—2…
The rice hull could be the one of the most abundant agricultural waste in Korea. Since the efficient utilization of agricultural waste or byproducts of food industry would be critical for the sustainable growth, this study conducted the investigation of the chemical composition and the morphological properties of rice…
The natural fiber/poly(lactic acid) (PLA) composites were prepared with ramie and jute short fiber as reinforcement and PLA as matrix. The mechanical and thermal properties of the composites were investigated. The results show that the properties of the composites are better than those of plain PLA. When the content o…