Materials Literature
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Capping-free and linker-free nanostructures/hybrids possess superior properties due to the presence of pristine surfaces and interfaces. In this review, various methods for synthesizing pristine nanomaterials are presented along with the general principles involved in their morphology control. In wet chemical synthesi…
Some polymeric additives were studied to understand their effects on the amorphous phase of ibuprofen (IBU), used as a poorly water soluble pharmaceutical model compound. The amorphous IBU in bulk, as well as in nanopores (diameter ~24 nm) of anodic aluminum oxide, was examined with the addition of poly(acrylic acid),…
The purpose of this research is to produce microparts reinforced with unidirectional whiskers using laser stereolithography. Electrically conductive whiskers are added to a liquid photopolymer and an electric field is applied to the liquid photopolymer, which aligns the axes of the whiskers along the direction of the…
Binary RuO2-HfO2 films on Ti substrates were prepared by a thermal decomposition method. cyclic voltammetric and charge/discharge properties of the RuO2-HfO2 electrodes were characterized. It was determined that the incorporation of HfO2 into RuO2 greatly improved the capacitive properties of the material. The RuO2-Hf…
Circularly polarized light is employed to write information into cholesteric liquid crystal (CLC) cells that initially exhibit homogeneous planar alignment and are fabricated with a photoaligning boundary layer. Overlap of the writing beam with light reflected from the CLC phase disrupts the reflective Grandjean textu…
A straightforward method of synthesising Au@Pd core-shell particles on a well characterised γ-Fe₂O₃ (0001) substrate has been developed which will enable fundamental studies into the surface chemistry of these catalytically interesting systems. Au and Pd were sequentially deposited onto a γ-Fe₂O₃ (0001) substrate in u…
We report herein, a novel method for the formation of highly stable BF3-induced J-aggregates by interaction between meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS4) and BF3O(C2H5)2. The aggregates were characterized by NMR (1H, 11B and 19F), optical absorption, cyclic voltammetry, FT-IR and fluorescence spectroscopic…
When an impactor strikes a body at hypervelocities the momentum transferred to the impacted body is greater than the initial impactor momentum. This effect is due to the crater ejecta, and when the impacted body's mass provides some of the momentum change, the effect is referred to as momentum enhancement. The small a…
The aim of this study was to investigate the utilization of a recycled rayon waste-kapok mixtures as an oil sorbent for the removal of diesel, motor oil and bunker C. The effects of the kapok fibers: rayon fibers ratio and the additional of sodium sulfate on RRWK sorbents properties were investigated through series of…
The purpose of this study is to further understanding of the structural, electronic, magnetic properties of CdO doped with transition metal (Mn) and non metal element (N). The calculations are performed by the developed full-potential augmented plane wave plus local orbitals method within the spin density functional t…
The corrosion behaviour of welded maraging steel in hydrochloric acid solutions was studied over a range of acid concentration and solution temperature by electrochemical techniques like Tafel extrapolation method and electrochemical impedance spectroscopy. The corrosion rate of welded maraging steel increases with th…
Neste trabalho foram preparados e avaliados nanocompósitos de poliestireno de alto impacto (HIPS) e nanoargila. Três tipos de argila montmorilonita modificadas com sal quaternário de amônio (OMMT), denominadas de S4, S7 e B8, e uma argila sódica NT-25 foram empregadas para a obtenção dos nanomateriais. A inserção da a…
The implementation of thirty-two pentafluorophenyl groups in the periphery of a phthalocyanine analogue results in a photosensitizer with a pronounced resistance towards autophotooxidation. The synthesis relies on the microwave-assisted cycloaddition of terminal alkynes to tetrakis(pentafluorophenyl)cyclopentadienone,…
Alternating bending shear stresses lead to the formation of twin orientations in the texture of FCC materials with middle and low stacking fault energy (SFE). Only in the stainless steel with a low SFE during alternating bending with different number of cycles components of shear texture {111}; {hkl}; {001} were forme…
We investigate mixing effects on the glass state of binary colloidal hard-sphere-like mixtures with large size asymmetry, at a constant volume fraction φ = 0.61. The structure, dynamics and viscoelastic response as a function of mixing ratio reflect a transition between caging by one or the other component. The strong…
CdS nanocrystals with a wide variety of shapes including spheres, tetrahedra, and branched and flower-like structures have been conveniently tuned by only changing the amount of trioctylphosphine (TOP) used in a noninjection synthetic approach, in which CdO and S powder were directly used as reactants in paraffin medi…
This work presents a method for measuring the electrical resistivity, carrier concentration and Seebeck coefficient of electroplated thermoelectric layers in the presence of electrically conducting seed layers, and suitable for in-line characterization. The method is based on measuring the initial properties of the se…
First principles calculations are performed by using Vienna ab initio simulation package within the framework of density functional theory to understand the electronic and structural properties of yttrium, zirconium and niobium hydrides. The equilibrium lattice constant, the bulk modulus, the total density of states a…
Chitin was modified via grafting with poly(4-vinylpyridine) (P4VP) to form chitin-g-P4VP. The reaction was carried out under homogeneous conditions using potassium persulphate (K2S2O8) (KPS) as a redox initiator. The effect of monomer concentration on the extent of grafting (%G) was studied by the gravimetric method.…
Crystals of a new polymorph (α-form) of the known semi-organic nonlinear optical (NLO) compound bismuth thiourea chloride (Bi[CS(NH2)2]3Cl3, BTC) have been successfully grown from hydrochloric acid solutions of thiourea and bismuth chloride. Single crystal X-ray diffraction reveals that α-BTC crystallizes in a monocli…