Materials Literature
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Nb-doped SrTiO3 thermoelectric ceramic composites with potassium titanate (KTO) nanowires addition were fabricated by the pressure-less sintering method in an Ar atmosphere. KTO addition significantly reduced the thermal conductivity and enhanced the electrical conductivity. Meanwhile, the Seebeck coefficient was almo…
The dynamics of granular media in the jammed, glassy region is described in terms of “modes”, by applying a principal component analysis (PCA) to the covariance matrix of the position of individual grains. We first demonstrate that this description is justified and gives sensible results in a regime of time/densities…
Two additive-induced isomeric aluminoborates, (CH(3)NH(3))(2)(H(2)O)(2)[Al(B(5)O(10))] (1) and (CH(3)NH(3))(H(2)O)[Al(B(5)O(10))] (2), have been obtained by using small methylamine molecules as structure directing agents (SDA) under solvothermal conditions and characterized by elemental analysis, IR, TGA, powder X-ray…
We have studied the microscopic shape, contact angle and Laplace law behavior of the liquid-gas interfaces at a superhydrophobic surface. A superhydrophobic surface is immersed in water, and the radius of liquid gas menicsi that span between adjacent ridges of the surface texture is measured. The surface pattern consi…
Nickel zinc ferrite (NixZn1−xFe2O4 where x=0.1, 0.3, 0.5) nanoparticles were synthesized by chemical co-precipitation method. The doping effect of nickel ions on crystalline phase, size, particle size, and saturation magnetization (M S) are investigated. The XRD patterns confirm the single crystalline phase of the nan…
Monomeric and dimeric bifunctional chelates based on the AAZTA (6-amino-6-methylperhydro-1,4-diazepinetetraacetic acid) platform bearing arylamino and isothiocyanate groups for conjugation to biomolecules were synthesised. Both systems were used for the preparation of high relaxivity dendrimeric (PAMAM G1) and multime…
Polyoxometalate (POM) cluster anions form highly organized monolayers on planar surfaces, stabilize metal nanoparticles in solution, and serve as structural components of hollow, single-walled vesicles. Until recently, each of these classes of superstructures was viewed as fundamentally distinct. Now, however, new dat…
A series of lanthanide complexes with the 4-ethylbenzoic acid ligand (4-eba), [Ln(4-eba)3(phen)]2 (Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5) and Ho (6); phen = 1,10-phenanthroline), have been synthesized and structurally characterized by single-crystal X-ray diffraction. In the isostructural complexes 1–4, two Ln3+…
The continued growth of the world’s developing countries has placed an ever increasing demand on traditional fossil fuels. This increased demand for fossil fuels has lead to increasing research and development of alternative energy sources. Hydrogen gas is one of the potential alternatives under development. It is ant…
A model is developed for anisotropic ceramic crystals undergoing potentially large deformations that can occur under significant pressures or high temperatures. The model is applied to describe silicon carbide (SiC), with a focus on α-SiC, specifically hexagonal polytype 6H. Incorporated in the description are nonline…
We present a systematic study of the structural, electronic, magnetic and optical properties of icosahedral bimetallic Ag((13-p))Ni(p) (p < or = 6) clusters in the gas phase investigated in the framework of density functional theory (DFT and TDDFT). In the most-stable structures, the central position is found to be oc…
Mechanoluminescence (ML) in a CaAl 2 Si 2 O 8 : Eu 2 + phosphor was greatly enhanced by partial Sr 2 + substitution for Ca 2 + ; ML intensity reached a maximum at Sr 2 + content of 40 mol %. Moreover, ML was not observed at Sr 2 + content of 80 mol % or higher. To investigate the relationship between ML and the crysta…
Due to high neutron absorption cross section, boron and its compounds find extensive application in the nuclear industry. The former Metallurgy Division and the present Materials Processing Division have developed processes for the production of boron, its compounds and components for application as control/shutoff ro…
Nanospheres are the particles having the size range between 10-200 nm in diameter. Nanospheres can be amorphous or crystalline in nature and also they have the ability to protect the drug from enzymatic and chemical degradation. It has been shown that the hydrophobic surfaces of these particles are highly susceptible…
We focused on qualitatively exploring the basic mechanisms involved in the Ionic gelation (IG) process, a method quite frequently used for synthesis of chitosan (CS) microparticles (MPs) and nanoparticles (NPs).We synthesized CS MPs and NPs using the Ionic gelation and microemulsion methods, and characterized the CS N…
The electrochemical properties of small carbon nano-onions (CNOs) in the solid phase, nonmodified carbon nano-onions (n-CNOs), and CNOs functionalized with carboxylic acid groups [oxidized carbon nano-onions (ox-CNOs)] were investigated by cyclic voltammetry. The redox properties of CNO films depend on the functionali…
The oxygen nonstoichiometry of has been measured as a function of at temperatures between 600 and by coulometric titration and thermogravimetry. An ideal solution defect model, a regular solution model, and a defect association model, taking into account the association of reduced dopant species and oxygen vacancies,…
Vanadium oxide inverse opal structures were fabricated by electrochemical deposition into self-assembled colloidal crystal templates and electrochromic performance was measured from the resulting macroporous vanadium oxide films. The periodic inverse opal structure resulted in an increased switching speed and a higher…
This article provides an overview of current developments with regard to the use of AuI compounds as precursors in the synthesis of Au nanostructures with controlled shapes or morphologies. We begin with a brief description of the difference between AuI and AuIII compounds, followed by a discussion on how the solubili…
Photochromic switches fulfill the general molecular design criteria for the surprisingly straightforward small-scale integration of seemingly complex set–reset latches. The implications of this re-interpretation are discussed with the example of a dithienylethene photochrome. The concept is shown to be valid for a mul…