Materials Literature
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Abstract The structural phase transition from fluorite to pyrochlore and the strength of the coordination bond of Zr–O in Gd 2 Zr 2 O 7 were investigated by XANES spectra of both O and Zr K ‐edge. The energy difference of the O K ‐edge absorption spectra at 532 and 536 eV was assigned to the crystal field splitting en…
A eficiência da aplicação de filmes à base de proteínas de soro de leite foi avaliada em um sistema de embalagem que consistia em um pote plástico utilizando-se filmes de proteínas de soro de leite como fechamento superior. Pedaços de maçã foram embalados e armazenados à temperatura ambiente (25 °C) e sob refrigeração…
We analyze the electric field modes excited in resonant L-shaped gold nanoparticles using a finite-difference time domain method. Compared to a single gold nanorod, both the odd and even modes of the L-shaped nanoparticles can be excited due to the symmetry breaking. The nanoparticles with equal and unequal arms have…
Abstract Polycaprolactone (PCL) is a biodegradable and bioresorbable polymer with applications ranging from use in packaging to medical sutures. In this study, the use of an atmospheric pressure plasma to deposit plasma polymerised PCL (P‐PCL) coatings from a PCL diol precursor is evaluated. Fourier transform infrared…
Abstract We introduce some representative studies from our laboratory, mostly from the 21st Century. We are interested in the synthesis, optical spectroscopy, such as magnetic circular dichroism (MCD), circular dichroism (CD), and electrochemistry of large aromatic molecules such as porphyrins and phthalocyanines, as…
In this paper, we reported a comparative study of process and structural characterization of cadmium sulfide ( CdS ) and zinc sulfide ( ZnS ) thin films by chemical bath deposition (CBD) technique. Their deposition process is similar which clearly shows three different growth phases, a none-film one, a quasi-linear on…
A vapor-phase deposition approach to the silanization modification of the oxidized porous silicon (PSi) surface using (CH3O)3Si(CH2)3NH2 has been exploited. Standard clean (SC)-1 (NH3H2O/H2O2/H2O, 1:1:5,v/v) and SC-2 [HCl/H2O2/H2O (1:1:6,v/v)] solutions are utilized for the first time to obtain oxidized PSi and have b…
Composition solid electrolytes (1 − x )LiClO 4 - x MgO are synthesized and their physicochemical properties are studied. According to the data of differential scanning calorimetry, for sufficiently high oxide concentrations, all lithium perchlorate is present in the composite in the amorphous state. Impedance spectros…
A method of manufacturing hierarchical metallic surfaces demonstrating superhydrophobic properties is presented. The surfaces showed apparent contact angles as high as 153° and sliding angles of 10° for 50–100 μl droplets. The Cassie-like model [A. B. D. Cassie and S. Baxter, Trans. Faraday Soc. 40, 546 (1944)], consi…
Surface potential decay (SPD) characteristics of a corona charged polyethylene terephtalate (PET) are investigated experimentally. A negative corona discharge produced in a needle -grid -plate electrode system was employed to charge the surface of the film samples (thickness: 0.5 mm; surface: 50 mm x 50 mm). The tempe…
We have developed a technique for the fabrication of hierarchically organized micro/nano-structures of TiO 2 by means of anodic oxidation of Ti nanorods prepared by glancing angle deposition. The fabricated nanostructures consist of small TiO 2 nanotubes that form brush-type shells around long central oxide cores. Thi…
Phenothiazine polymers have been prepared for the first time by interfacial oxidative polymerization. Effects of the concentration and ratio of reagents, temperature, and time of reaction on the yield and molecular mass characteristics of polyphenothiazine are investigated. The study of phenothiazine oxidation indicat…
The corrosion behavior of aluminum in 1M HCl solution in the absence and presence of expired Ranitidine drug was investigated using weight loss and electrochemical techniques. It was found that, the inhibition efficiency of Ranitidine depends on the concentrations. The inhibitive action of this compound discussed in t…
We investigate earth abundant materials for thin-film solar cells that can meet tens of terawatts level deployment potential. Candidate materials are identified by combinatorial search, large-scale electronic structure calculations, and literature reviews. We identified cuprous oxide (Cu2O) as a prototype candidate fo…
Abstract Summary: Ionic Liquids (IL) were applied as solvent and reaction medium in the field of homogeneous cellulose chemistry. Whereas investigations on tosylation and nucleophilic displacement reactions lead to unexpected products the application of the Huisgen reaction was successful. The standard conditions for…
ZnO was synthesized by the hydrothermal method using proper aqueous solutions of ZnCl2 and NaOH, as the main raw materials, corresponding to the molar ratio of Zn2+ : OH- = 1 : 20 (solution ‘A’), and a proper proportion of water as solvent, ethanol (EtOH) as non solvent and polyethylene glycol (PEG) as nonionic surfac…
Abstract In this work, the feasibility of a plasma electrolytic carburizing (PEC) treatment on AISI H13 steel using an aqueous solution of C 3 H 5 (OH) 3 , and NaOH was investigated. The substrate samples were biased cathodically to a 20 kW pulsed DC power supply with a variable voltage. The formation of hard carbon‐r…
Aluminum was detected in reaction-bonded boron carbide that had been prepared by pressureless infiltration of boron carbide preforms with molten silicon in a graphite furnace under vacuum. The presence of Al 2 O 3 in the heated zone, even though not in contact with the boron carbide preform, stands behind the presence…
By measurement of the small-angle and wide-angle X-ray scatterings and infrared and Raman spectra and thermal data, microphase separation phenomena have been investigated for a series of polyethylene-poly(ethylene oxide) diblock copolymer (PE-b-PEO) in both the heating and cooling processes and compared with the struc…
Al-doped ZnCoO films were grown by sol-gel process onto SiO2 and Si(100) substrates. Structural analysis shows that all samples have the hexagonal würtzite structure with a slight preferential orientation along the c-axis. The insertion of Al and Co into the ZnO matrix has been experimentally evidenced by UV-visible s…