Materials Literature
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Electrodeposition of ZnO/eosin Y hybrid thin films from aqueous mixed solution of zinc chloride and eosin Y as promoted by reduction of oxygen has been studied. Highly oriented crystalline hybrid thin films with two distinctive structures have been obtained depending on the redox state of eosin Y. Deposition at potent…
The electrochemical and spectroelectrochemical properties of ZnO thin films prepared by reactive pulsed laser deposition in oxygen ambient have been investigated. The as-deposited and lithiated ZnO thin films were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and t…
The corrosion behavior of Mg is of interest because of its growing use as an alloy in the transportation industry and also because it is a major component of some intermetallic phases in Al alloys, such as the deleterious S -phase found in AA2024-T3. Pure Mg corrodes rapidly in a chloride-containing solution and even…
The surface properties of organosilane-modified smectite-type clays were examined by various physico-chemical techniques, including thermal gravimetric analysis (TGA), surface area measurements from N2 adsorption/desorption experiments (BET method), Fourier transform infrared spectroscopy (FTIR), chemical stability me…
In this study, the dimensional and physical properties of cotton/spandex single jersey fabrics are investigated and the results compared with fabrics knitted from otton alone. The loop length and amount of spandex are usted to determine the dimensions and properties of the knits. It is apparent that as the amount of s…
The synthesis of T8 silsesquioxane cages from trialkoxysilanes using tetra n-butylammonium fluoride is described. The yields are in the range 20–95%, which is a great improvement on other literature routes. This methodology enables a wide range of functionalised T8 cages to be prepared. The X-ray crystal structures of…
Hybrid electrochemical supercapacitors based on carbon and conducting polymers as negative and positive electrodes, respectively, have been investigated. Poly-(3-fluorinatedphenyl)thiophene and poly(ethylenedioxythiophene) derivatives showing various ranges of electrochemical activity and capacitance values were evalu…
Two results about the planewave response of an isotropic, dielectric-magnetic, homogeneous, planar slab are deduced when the real parts of both the permittivity and the permeability are altered from positive to negative. First, the reflection and the transmission coefficients suffer phase reversals without change in t…
The plasma generated from a gas mixture of NH3 plus O2 (NH3 + O2) has been used to impart unique chemical and biological characteristics to polytetrafluoroethylene (PTFE). PTFE treated with NH3 + O2 plasma was physiochemically distinct from surfaces treated with plasma of either NH3 or O2 alone, as determined by elect…
It is well-documented that solid particles can be effective stabilisers of emulsions, and that the type of the emulsion formed is related, inter alia, to the particle wettability. In general it is to be expected that the free energy change accompanying the formation of a solid-stabilised emulsion will be positive and…
The crude latex of Calotropis procera was evaluated for anthelmintic activity using adult earthworms. Both fresh as well as aqueous extracts of dried latex exhibited a dose-dependent inhibition of spontaneous motility (paralysis) and evoked responses to pin-prick. With higher doses (100mg/ml of aqueous extract of dry…
A pH-responsive, sterically-stabilised polystyrene latex is used as a particulate emulsifier for oil-in-water emulsions; demulsification occurs rapidly on lowering the solution pH and the original emulsion can be reformed on pH cycling.
A estrutura de cada polímero tem influência direta sobre a sua densidade e suas propriedades mecânicas. Ramificações longas, como as presentes no polietileno de baixa densidade, por exemplo, aumentam a resistência ao impacto, diminuem a densidade e facilitam o processamento, enquanto que as ramificações curtas, presen…
We have found that compound 1 forms organogels in appropriate organic solvents and the resultant gel phase exhibits unusual emission properties arising from the excimer formation.
Excited state intramolecular proton transfer (ESIPT) of salicylideneaniline enol and subsequent isomerization of the proton transferred keto structure to the final long-lived photochromic product has been studied in different solvents using femtosecond transient absorption and picosecond fluorescence spectroscopy. Thr…
Monomeric rare earth metal bis(phenolato) complexes [(Ls,s)Ln{N(SiHMe2)2}(THF)] (1a–4c) were isolated from the reaction of silylamido complexes [Ln{N(SiHMe2)2}3(THF)x] (Ln = Sc, x = 1; Ln = Y, Lu, x = 2) and one equivalent of tetradentate 1,ω-dithiaalkanediyl-bridged bis(phenol)s etbmpH2, ptbmpH2, edtbpH2 and pdtbpH2…
Chitosan microspheres are used as catalysts for the synthesis of monoglyceride by fatty acid addition to glycidol. Microspheres are obtained by drying gel beads of the natural polymer under supercritical CO2 conditions, which makes the access to the polymer functional groups easy.
Type II synthase (PhaC1(Ps)) for polyhydroxyalkanoate (PHA) from Pseudomonas sp. 61-3 was subjected to an in vitro evolution system including PCR-mediated mutagenesis in order to improve the function of PhaC1(Ps) in terms of its ability to produce poly(3-hydroxybutyrate) [P(3HB)] in recombinant Escherichia coli. Based…
Interlinking 2D azido-bridged and spin-canted antiferro-magnetic layers with semi-rigid organic pillars yields a 3D molecular metamagnet.
In this Perspective, some of the basic principles of ligand design will be described as they apply to the synthesis of metal complexes with liquid crystal properties. Liquid crystal properties of metal complexes are a delicate function of both ligand and metal and examples will be chosen to illustrate this statement.…