Structural and magnetic properties of nanocrystalline ZnFe2O4 powder synthesized by reactive ball milling
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INHIBITION EFFECT OF ENVIRONMENTALLY BENIGN KUCHLA ( STRYCHNOS NUXVOMICA ) SEED EXTRACT ON CORROSION OF MILD STEEL IN HYDROCHLORIC ACID SOLUTION
The inhibition of the corrosion of mild steel in hydrochloric acid solution by the seed extract of Kuchla ( Strychnos Nuxvomica ) has been studied using weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization and linear polarization techniques. Inhibition was found to increase with increasing…
The Crystallized Mechanism and Optical Properties of Sol–Gel Synthesized ZnO Nanowires
ZnO nanowires were successfully prepared on a silica glass substrate using the sol–gel method. The ZnO nanowires grew from ZnO grains or ZnO grain boundaries, and the length increased with an increment in crystallized temperature. Diffused zinc ions combined with injected oxygen and gradually formed the ZnO nanowires.…
Size control and compartmentalization in self-assembled nano-structures of a multisegment amphiphile
A "multisegment amphiphile" has been synthesized by covalently connecting two well known building blocks, a gelator and a micelle forming surfactant. Self-assembly results in the formation of compartmentalized nano-object displaying properties inherited from both parents.
A multi-rate kinetic model for spontaneous oriented attachment of CdS nanorods
A multi rate kinetic model to explain the spontaneous oriented attachment of CdS nanorods in the presence of an amine is presented. The model demonstrates the reasons that elongation is restricted to a maximum of quadruple, the starting rod length for rods of a certain aspect ratio (8 × 30 nm) with no elongation occur…
Praseodymium(iii)-based bis-metallacalix[4]arene with host–guest behaviour
The reaction of Pr(NO(3))(3).6H(2)O with the ligand 2-hydroxy-N-(2'-hydroxyethyl)-3-methoxybenzamide (H(3)L) in MeOH-MeCN generates the nonanuclear compound [Pr(9)(H(2)L)(8)(OH)(10)(NO(3))(8)](NO(3))(H(2)O)(2)(CH(3)CN) (), whose single-crystal X-ray structure reveals the presence of metallacalix[4]arene cavities that…
Charge-driven and reversible assembly of ultra-dense polymer brushes: formation and antifouling properties of a zipper brush
We investigated a new type of polymer brushes: the zipper brush. By adsorbing a diblock-copolymer with one charged block and one neutral block to an oppositely charged polyelectrolyte brush, a neutral polymer brush is formed on top of an almost neutral complex layer of polyelectrolytes. This neutral brush can be adsor…
RESONANT MODES AND RESONANT TRANSMISSION IN MULTI-LAYER STRUCTURES
Resonant modes of multi-layer structures which contain the regions of negative epsilon material (such as a metal in the visible range) are analyzed.Existence of two separate classes of resonant modes is demonstrated.One is related to the excitation of the surface mode at the interface of the regions with opposite sign…
The gas-phase structure of octaphenyloctasilsesquioxane Si8O12Ph8 and the crystal structures of Si8O12(p-tolyl)8 and Si8O12(p-ClCH2C6H4)8
The equilibrium molecular structure of octaphenyloctasilsesquioxane Si(8)O(12)Ph(8) in the gas phase has been determined by electron diffraction. It was found to have D(4) point-group symmetry, with Si-O bond lengths of 1.634(15)-1.645(19) A, and a narrow range [147.5(45)-149.8(24) degrees] of Si-O-Si angles. The stru…
Polymer stabilized ZnO nanoparticles for low-temperature and solution-processed field-effect transistors
Homogeneous, smooth and densely-packed nanoparticulate ZnO films for field-effect transistors (FETs) are formed by spin-coating suspensions of ZnO nanoparticles in an organic solvent, followed by baking at 150 °C. The morphology of the films is strongly dependent on the type and amount of surfactant polymers that are…
Electrochemical impedance study of the polymerization of pyrrole on high surface area carbon electrodes
Polymerization of pyrrole on a Vulcan XC-72 carbon black coated glassy carbon electrode was performed using potentiodynamic and galvanostatic regimes in an aqueous solution of 0.5 M pyrrole and 0.5 M NaClO(4). Responses of the electrodes prepared under different conditions were recorded using cyclic voltammetry and el…
The potential of AB(1Φ) systems for direct actinometry. Diarylethenes as successful actinometers for the visible range
A new actinometric procedure based on the analysis of kinetic traces of the actinometer is proposed in this study. It is suitable for thermally-stable photochromes, such as diaryethenes, which may be useful candidates for visible-range actinometry. The treatment of the traces employs a rate law which was achieved via…
Responsive behavior of 4-(N-maleimido)azobenzene in polymers with aromatic main chain and side chain linked units
Polymer matrices with aromatic main chain and side chain linked units (polystyrene, polysulfone) were employed to construct thin films containing maleimidoazobenzene molecules in order to develop new materials with responsive properties. The photochromic behavior of the active compound was studied both in the solid an…
Formation and energy transfer property of a subphthalocyanine–porphyrin complex held by host–guest interactions
A stable 2 : 1 host-guest complex is formed between a beta-cyclodextrin-conjugated subphthalocyanine and a tetrasulfonated porphyrin in water. The complex exhibits an energy transfer property from the excited subphthalocyanine to the porphyrin core with an excitation energy transfer quantum yield of 0.38.
Hybrid lipid–silica microcapsules engineered by phase coacervation of Pickering emulsions to enhance lipid hydrolysis
We report on the fabrication of dry hybrid lipid-silica microcapsules for enhanced lipid hydrolysis using Pickering emulsion templates formed by interfacial nanoparticle-emulsifier electrostatic interaction. The microcapsules are produced by controlled precipitation of emulsion droplets by oppositely charged silica na…
Excited-state dynamics and dye–dye interactions in dye-coated gold nanoparticles with varying alkyl spacer lengths
Gold nanoparticles (ca. 3 nm in diameter) coated with bis(diarylamino)biphenyl-based thiols with two different alkyl spacers (propyl and dodecyl) between the chromophore and the surface-anchoring thiol group have been prepared and characterized with a variety of techniques. The excited-state dynamics of the dyes in cl…
Amphiphilic photo-isomerisable phosphanes for aqueous organometallic catalysis
Water-soluble phosphanes were tagged with a light-responding diazo group. Upon UV exposure, the diazo-isomerisation led to phosphane morphology change, resulting in an increase in the reaction rate of an aqueous palladium-catalysed cleavage reaction.
Fourier Transform Infrared Analysis of the Thermal Modification of Human Cornea Tissue during Conductive Keratoplasty
This paper presents a study using in vitro Fourier transform infrared spectroscopy (FT-IR) analysis to determine the thermal damage induced to the human cornea by the conductive keratoplasty (CK) procedure. Human cornea tissues were treated with CK at different radiofrequency power (58-64%) and pulse duration (0.6-1.0…
Quaternary Ammonium Bacterial Cellulose for Adsorption of Proteins
Bacterial cellulose (BC) has attracted attention for preparing advanced materials due to its microfibrous structure. In this study, quaternary ammonium bacterial cellulose (QABC) as well as quaternary ammonium plant cellulose (QAPC) as adsorbents for proteins have been prepared. Introduction of the quaternary ammonium…
Thermoelectric Performance of p-Type Mg<SUB>2</SUB>Si<SUB>0.25</SUB>Sn<SUB>0.75</SUB> with Li and Ag Double Doping
The single-phase of p-type Mg2Si0.25Sn0.75 with Li and Ag double doping were prepared by the liquid-solid reaction and hot-pressing methods. All samples thus obtained were identified by XRD as single-phase solid solutions with an anti-fluorite structure. The effects of Li and Ag double doping on thermoelectric perform…