Materials Literature
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Poly(L-lactide) (PLLA) microcapsules containing acetaminophen (APAP) were prepared by three emulsion solvent-evaporation methods including an O/W-emulsion method, an O/W-emulsion co-solvent method and a W/O/W-multiple-emulsion method. The average size and morphology of the microcapsules varied substantially among thes…
Abstract We developed a dilatometer to investigate the specific volume of polymers as a function of pressure (to 100 MPa), temperature (to 260 o C), cooling rate (to 100 o C/s), and shear rate (to 80 1/s). The dilatometer is based on the principle of confined compression and comprises of a pressure cell used in combin…
Using bioactivity-directed isolation procedures, three new spirostanol saponins designated sansevierin A (1), sansevistatin 1 (2), and sansevistatin 2 (3) were isolated (10(-5) % yield) from the CH3OH-CH2Cl2 extract of Sansevieria ehrenbergii, accompanied by three known steroidal saponins (4-6). The structures were de…
The effects of heating without water removal and drying of bleached kraft fibers were separately investigated. Water swellability as measured using a water retention value method (WRV) and cellulose degree of polymerization as measured using a viscosity method were used to gauge the effects of such treatments on fiber…
Weight reduction to improve automobile fuel economy has triggered renewed interest in magnesium. The effects of Ca/Sr separate and composite additions to AZ91D magnesium alloy on its microstructure and mechanical properties have been investigated. The results indicate Ca can refine both the grain and eutectic phase of…
A new uranium(VI) silicate, Cs2(UO2)(Si2O6), has been synthesized by a high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction and solid-state NMR spectroscopy. It crystallizes in the orthorhombic space group Ibca (No. 73) with a = 15.137(1) A, b = 15.295(1) A, c = 16.…
Here we report the results of the first three-dimensional refinement of the 10 Å phase performed with single-crystal X-ray data. The 10 Å phase, Mg 3 Si 4 O 10 (OH) 2 H 2 O, is monoclinic, space group C2/m, a = 5.323(1)Å, b = 9.203(1)Å, c = 10.216(1)Å, β = 99.98(1)°, V = 492.9(2) Å 3 ; the calculated density, assuming…
In the present study, the net shape manufacturing of alumina ceramics was carried out using computer numerically controlled (CNC) machining of differently processed alumina green bodies using different tool materials and geometries. In case of a carbide‐coated tool, severe wear was observed; on the contrary, a diamond…
Phosphorus forms dictate the P release potential of soils in agronomic and environmental terms. The main purposes of this work were to study P forms by sequential chemical fractionation in soils typical of Mediterranean areas, establishing correlations between P fractions and soil properties, and identify the relation…
This paper reports the first successful preparation of perfectly aligned cylindrical microdomains in liquid crystal (LC) diblock copolymer, polystyrene- block -poly-LC with a poly-LC composition of 84%, by application of a magnetic field. The prerequisite for their alignment is the exhibition of order-disorder transit…
Carbon nanotube (CNT) films were grown using microwave plasma-enhanced chemical vapor deposition. Catalytic cobalt (Co) nanoparticles were deposited on a silicon substrate using pulsed arc deposition. A titanium nitride (TiN) thin film was used as a buffer layer on the substrate in order to prevent the formation of Co…
Strongylophorine-26, a new meroditerpenoid, was recently identified as an inhibitor of cancer cell invasion. This study was undertaken to characterize its mechanism of action. We find that strongylophorine-26 inhibits the motility of MDA-MB-231 breast carcinoma cells on a plastic surface. Upon addition of strongylopho…
Cobalt thin films were produced by metal-organic CVD from C5H5Co(CO)2, at various temperatures and for various deposition times. The films have been grown onto glass substrates with no buffer. The crystalline structure, morphology, and composition of the films were analyzed by X-ray diffractometry (XRD), field-emissio…
The degradation of porous low-dielectric-constant (low- k ) materials, such as porous methyl silsesquioxane (MSQ) and porous chemical-vapor-deposited SiOCH films, by damascene etch and ash processes has been investigated. The influence of etch damage becomes relatively stronger as ash damage improves. The etch damage…
Abstract This paper presents a short overview of the high flexibility and potential of inductively coupled thermal plasmas for the synthesis of nanoparticles and especially high refractory carbide nanopowders. The high energy and temperature of theses plasmas enable the evaporation of all materials allowing the use of…
Abstract Thermoelectrically active and stable perovskite‐type materials e.g. La 1–x Ca x CoO 3 (0<x<0.4), La 1–x Ca x Co 0.99 Ti 0.01 O 3 (0<x<0.2), and Ca 3 Co 4 O 9 have been successfully synthesized using selected precursor compounds. This soft chemistry route allows the control of the elemental composi…
Abstract Nanocomposites based on Styrene Butadiene Rubber (SBR) and Acrylonitrile Butadiene Rubber (NBR) with varying acrylonitrile contents (19%, 34% and 50%, respectively) and octadecyl amine modified and unmodified Na-Montmorillonite clays were prepared. Dynamic mechanical thermal analysis (DMTA) was performed on t…
A new method to prepare polypropylene- graft -polystyrene copolymers with tailored structure has been developed. The ability of a series of copolymers with variable structure to compatibilize the polypropylene−polystyrene blends was evaluated through microscopic observation of the morphology of the blends. The synthes…
This study reports the novel synthesis of nano-sized cellular thin film with high degrees of crystallinity and purity using an electrochemical deposition of green rust 2 (GR2) and its further oxidation. This technique is applicable to substrates with large surface areas of a few square centimeters or more without the…
Abstract We demonstrate a cholesteric liquid crystal‐polymer dispersion where the liquid crystal is encapsulated via polymerization induced phase separation. A polymerizable additive formulation is used to control the liquid crystal droplet size. Encapsulation prevents the flow of liquid crystal thereby preserving the…