Materials Literature
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Based on the theory of sol-gel science, perovskite SrHfO(3) hollow cuboidal particles with tunable sizes were rationally synthesized by templateless hydrothermal reactions in KOH solutions. The concentrated KOH solution not only elevated the supersaturation of the reactants to promote the grain growth of SrHfO(3) but…
Lanthanideradioactive wastes are generated during the LiCl-KCl waste salt purification process developed in KAERI.The phosphate-based ceramics were studied for the immobilization of the wastes. The immobilization matrix developed in this study(ZITceramic wasteform)composed of zinc titanate(Zn2TiO4), CaHPO4, SiO2and B2…
A core/sheath structured mesoporous silica nanofibre was prepared by coaxial electrospinning combined with the solvent evaporation induced surfactant assembly process. The characterization has given convincing evidence for the continuous highly ordered mesoporous structures, and its catalyst application was tested.
Ferroelectret films (FFs) were fabricated using porous polyethylene (p-PE) film with various polarities treated by corona discharge. Their piezoelectric constant in the direction perpendicular to their surface was over 100 pC/N Hence, in order to clarify the piezoelectric motion, Piezo-Response Microscope (PRM) measur…
We describe here the synthesis and characterization of the octa-, hexadeca- and tetraicosa-brominated derivatives of octaphenylsilsesquioxane, [PhSiO1.5]8 or OPS, which offer high 3-D symmetry. Surprisingly OPS catalyzes its own bromination in refluxing CH2Cl2, in the absence of a traditional Lewis acid catalyst, lead…
A theoretical investigation of photoluminescence spectra for amorphous silicon quantum-dots (1 - 4 nm), at room temperature, were used to study the effect of both spatial and quantum confinements spontaneously via determination the energy peak of maximum intensity transition. The results show a continuous shifting tow…
In this study, we try to answer a fundamental question: what is the consequence of the noncovalent interaction between a polymer and a coordination compound? Here, polyethylene glycol (PEG-4000, PEG-b) and copper complex of ethylenediaminetetraacetic acid (H(2)CuY) were employed to solve this problem. A novel adduct (…
Computational energy minimization techniques have been used to study the structure and crystal properties of kaolinite. The full elastic tensors of the sheet silicates of clay have been derived with first-principles calculations based on density functional theory. All calculations were performed using GULP program.
The effect of uniaxial pressure applied along the principal crystallographic directions on the dispersion and temperature dependences of the birefringence Δn i of K2ZnCl4 crystals has been studied. It has been established that the birefringence Δn i is sensitive to uniaxial pressures and that the uniaxial stresses do…
Reflectivity changes in oxygen-incorporated Ge 2 Sb 2 Te 5 (GST) films were investigated via a laser-induced crystallization process. The crystallization process showed that the phase change speed and the laser power required for crystallization become faster and larger in GST films with a characteristic quantity of o…
In the electrochemical oxidation–reduction cycles (ORC) treatment for preparing surface-enhanced Raman scattering (SERS)-active substrates, chloride electrolyte was generally selected because this facilitates the metal dissolution-deposition process that is known to produce SERS-active roughened surfaces. In this work…
The valences of Cu and Ti ions in CaCu 3 Ti 4 O 12 (CCTO) are reassessed by characterizing the spectra of Cu(2p 3/2 ), O(1s), and Ti(2p 3/2 ) using X-ray photoelectron spectroscopy (XPS). The structure instability of CCTO leads to easy expulsion of oxygen from lattice during vacuum outgassing in XPS measurement, where…
We have prepared supersaturated-solution Mn-Al-C alloy powders by mechanical alloying using a planetary high-energy mill. The starting materials were pure Mn, Al and C powers. The mechanically-alloyed powders were subjected to a two-step heating. Although starting particles are Al and Mn with additive C, the Al peak d…
Attachment of 2,2-bipyridine onto a silica gel for application as a sequestering agent for copper, cadmium and lead ions from an aqueous medium A method was developed to attach 2,2-bipyridine (BP) onto a silica gel surface by a two-step reaction. The first step consisted of a reaction between the matrix and a silylati…
The process of electrospinning is considered one of the most promising methods for the fabrication of poly- mer nanofibers. This essentially consists of applying a high electric field, which causes stretching of the polymer which exits through a capillary. Among the numerous applications of this process, electrospinni…
Binary superparticles (SPs) from various functional nanoparticles are fabricated using oil droplets in microemulsion as templates. The structural stability of SPs is further improved by polymer decoration. This protocol provides a facile and flexible approach to integrate multifunctionalities in nanometre-sized sphere…
In questo lavoro è stato fatto un passo avanti significativo verso la fabbricazione di strutture MEMS e microsistemi con elevato aspect-ratio utilizzando il micromachining elettrochimico del silicio in soluzioni a base di HF (ECM). L’ECM è una tecnologia di microstrutturazione recentemente proposta che combina i vanta…
The electrochemical corrosion behavior of pure Cr has been studied under solid NaCl deposit in water vapor at 600°C. The results showed that the electrochemical corrosion reactions act in synergy with the chemical corrosion reactions in the overall corrosion process. The corrosion of pure Cr follows the electrochemica…
By using molecular self-assembly and polymer brush chemistry, adhesion of water droplets at solid/oil interfaces could be achieved and modulated by external triggers. Silicon wafers were hydrophobically modified with binary mixed self-assembled layers consisting of fluorinated silanes and atom transfer radical polymer…
We investigate herein the electrochemical behavior of hexacyanoferrate anions in polyelectrolyte multilayer (PEM) films made from poly(allylamine) (PAH) as a polycation and from hyaluronic acid (HA) as a polyanion as a function of the ionic strength and the concentration of the redox probe. Our data show that the film…