Materials Literature
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The present study was conducted to investigate the inclusion complexation of artemisinin (ART) with natural cyclodextrins (CyD), namely alpha-, beta-, and gamma-CyDs with the aim of improving its solubility and dissolution rate. Complex formation in aqueous solution and solid state was studied by solubility analysis,…
Peptide and protein microencapsulation into poly(lactide) (PLA) and poly(lactide-co-glycolide) (PLGA) microspheres continues to represent a technological challenge in terms of product sterility and up-scaling. The primary objective of this study was to examine the feasibility of a novel method for peptide and protein…
Local electrochemical impedance mapping (LEIM) was used to investigate local underfilm corrosion occurring on organic-coated AA2024-T3 exposed to chloride solution. Films (5-20 μm thick) of neat epoxy, polyurethane, and vinyl resins were studied. Frequently observed features in the LEI maps included: an unexpected dec…
It was shown previously that nanoparticles of layered compounds form closed-cage and nanotubular structures. These nanostructures received the generic name of inorganic fullerene-like (IF) materials. In particular nanoparticles of metal dihalides, like NiCl2 and CdCl2, were shown to form such closed-cage structures in…
Density functional theory calculations of the substitution and insertion of chlorides on hydroxylated NiO(111) surfaces have been performed to simulate the penetration mechanism of initiation of localized corrosion of passivated metal surfaces. The substitution of surface hydroxyls by is found to be endothermic with t…
Studies of the ring-opening polymerization (ROP) of L-lactide by Ph2SnX2 reveal that X (X = NMe2 or OPri) influences not only the rate of polymerization but also the nature of the polymer formed. Gel permeation chromatography (GPC), mass spectral analysis and 1H NMR spectroscopy of the polymers from these reactions re…
To develop a new alloy with high hydrogen storage capacity, partial Cr in TiCr1.8 was substituted by V—Fe alloy. X-ray diffraction and metallography observation proved that the substitution did not change the phase constitution of TiCr1.2(V–F)0.6. It still remained in its initial Laves phase related body centred cubic…
Three-dimensional (3D) porphyrin monolayer protected metal nanoclusters (MPCs) have been prepared to examine the effects of metal (Au, Ag, Au–Ag alloy, Pd and Pt) and size (1–3 nm) on the structures and photophysical properties. The quenching rate constants of the porphyrin excited singlet state by the surfaces of mon…
The nucleation and growth of calcium oxalate monohydrate (COM) crystals beneath stearic acid (SA) monolayers in the presence of citric acid (H3cit) was examined at different surface pressures. The results were compared with those of crystals grown in bulk solution. In bulk solution, the morphology of the precipitated…
The protection mechanism of a living body and man-made materials can be classified into two categories. One is a passive protection by which the body and materials are guarded by simple chemicals such as light absorbents, and the other is anactive protection that repairs with metabolic reactions the internal injury su…
Polythiophene (Pth) films and aligned microtubules with highly water-repellent surfaces have been electrosynthesized by direct oxidation of thiophene in boron trifluoride–diethyl etherate (BFEE): large contact angles of water (higher than 100°) on Pth surfaces are observed for the first time.
Phosphotungstic acid (PWA) was utilized as the reductive energy storage substance instead of conventional for the fabrication of an energy storage photocatalyst, which retains its reducing ability even after light irradiation. In the case where a PWA film was electrochemically charged at −0.8 V vs. Ag/AgCl for 1 h in…
Dispersions of liquid crystals in polymeric matrices (PDLC) are used as light Variable Optical Attenuators (VOAs). Electronically controllable VOAs play a crucial role for channel power equalizers in WDM systems. This article describes the theoretical model optimizing PDLC performance and the fabrication process utili…
The reduction of alumina-supported chromia with 13 wt.% chromium was investigated by X-ray photoelectron and X-ray absorption spectroscopies, in situ temperature-programmed Raman spectroscopy and in situ temperature-programmed diffuse reflectance infrared Fourier transform spectroscopy combined with mass spectrometry.…
INTRODUCTION: Calotropis procera is known to produce contact dermatitis and the latex of this plant produces intense inflammation when injected locally. However, the precise mode of its pro-inflammatory effect is not known. In present study we have pharmacologically characterized the inflammation induced by latex of C…
Silicon-based materials appear potentially to be attractive flame-retardants because of the protective coatings formed in fire, which decreases the rate of heat release. But few reports were presented about inorganic materials, such as SiO 2 , Al 2 O 3 , used as additive flame-retardants. In this paper the degradation…
Construction and characterization of structural and charge transport properties of electrostatically LbL self-assembled multilayers of gold nanoparticles and a viologen-based redox-active polyelectrolyte is reported.
The synthesis of biquinoxalinyl-bridged bis-porphyrin 4 and metallated derivatives 5-11 was achieved in high yields. UV-visible spectroscopy and electrochemical experiments indicated weak orbital coupling of the two quinoxalinyl units but minimal orbital coupling between the two porphyrins. The weak electronic communi…
The open circuit potential (OCP) of CoCrMo alloy before, during, and after mechanical disruption of the passive film is recorded in inorganic buffer solutions in the pH range 3.0-10.0. The OCP values in the active state show a different dependence on solution pH in acidic and alkaline pH. The results obtained from cat…
The microstructures of cryogenically ball-milled Cu were investigated by high-resolution electron microscopy. It was found that the grain-size reduction is a dislocation-controlled continuous process which consists of the formation of small-angle grain boundaries (GBs), a gradual increase in misorientations as a resul…