Materials Literature
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Two new diimine dithiolato complexes, (dbbpy)Pt(dmid), 1, and (dbbpy)Pd(dmid), 2, were prepared and characterized (dbbpy = 4,4'-di-tert-butyl-2,2'-bipyridine; dmid = 2-oxo-1,3-dithiole-4,5-dithiolate). Both complexes interact with the nitrile acceptor TCNQ, and 1 also interacts with TCNQF(4) and TCNE (TCNQ = 7,7,8,8-t…
High-density single-walled carbon nanotubes forming self-directed networks on nanoscale patterned substrates are produced by chemical vapor deposition. The roles of catalyst particles for the growth of single-walled carbon nanotubes are investigated. Transition-metal particles of 3−7 nm size, obtained by depositing th…
Poly(dimethylsiloxane)(PDMS)−metal-oxo nanocomposites have been prepared as transparent monoliths from dimethyldiethoxysilane (DMDES) and metal alkoxides, M(OR) n, where M = Al(III), Ge(IV), Sn(IV), Ti(IV), Zr(IV), Nb(V), and Ta(V). An accurate structural analysis of these hybrid materials has been performed by FTIR,…
The adsorption of proteins at biomaterial surfaces depends on the properties of the substrate and can cause changes in protein conformation. Time-of-flight secondary ion mass spectroscopy (ToF-SIMS) was used in this study to characterize human serum albumin (HSA) adsorption on two different polycarbonate surfaces: a n…
We describe two reagentless methods of silver deposition for metal-enhanced fluorescence. Silver was deposited on glass positioned between two silver electrodes with a constant current in pure water. Illumination of the glass between the electrodes resulted in localized silver deposition. Alternatively, silver was dep…
The complete transfer from an aqueous to an organic solution of negatively charged carboxylate- and sulfonate-modified gold nanoparticles in the presence of primary amines is demonstrated. The transfer of carboxylate-modified gold nanoparticles to chloroform was found to be dependent on the pH of the aqueous phase. Th…
A series of low molecular-mass organogelators (LMOGs) with conjugated diyne units, R−C⋮C C⋮C−R‘, has been synthesized from 10,12-pentacosadiynoic acid. R is a long alkyl chain and R‘ is a short or long alkyl chain containing an amide or ester group. The gelation efficiencies of these LMOGs and the parent acid (as asse…
The conductivity and magnetization of Fe1-xCoxS2 were measured to investigate quantum critical behavior in disordered itinerant magnets. Small x (<0.001) is required to convert insulating iron pyrite into a metal, followed by a paramagnetic-to-ferromagnetic metal transition at x = 0.032+/-0.004. Singular contributions…
Keggin ion-mediated synthesis of Au core-Ag shell bimetallic nanoparticles is described. Exposure of photochemically reduced aqueous (PW12O40)3- Keggin ions to AuCl4- ions leads to the formation of stable gold nanoparticles capped by the Keggin ions. The surface-bound Keggin ions may then be activated by UV irradiatio…
Standard research protocols were developed to explore the use of octahedral silsesquioxane (cube) organic/inorganic nanocomposites as model systems for determining nanostructure−processing−property relationships to demonstrate that nanoscale structural manipulation of the organic component can significantly change mac…
High-quality Zn(x)Cd(1-x)Se nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a systematic blu…
The collaborative oscillation of conductive electrons in metal nanoparticles results in a surface plasmon resonance that makes them useful for various applications including biolabeling. We investigate the coupling between pairs of elliptical metal particles by simulations and experiments. The results demonstrate that…
As biodegradable plastics have been receiving a great deal of attention from industry from an ecological view point, a number of plastics with biodegradability have been developed over the years. Biodegradable aliphatic polyesters of high molecular weight, consisting of dihydric alcohols and dicarboxylic acids (Bionol…
The crystal structure of poly(1,4- trans -cyclohexylenedimethylene 2,6-naphthalate) (P t CN) was identified by X-ray diffraction and molecular modeling, and the effect of the trans / cis ratio of 1,4-cyclohexylenedimethyl unit on the crystal structure of P t CN was also investigated. The unit cell of P t CN is found t…
우라닐 이온, <TEX>$UO^+_2$</TEX>와 Schiff-base 와의 착화합물이 글리실글라이신과 살리실알데히드, 2-히드록시-1-나프트알데히드, 2,3-디히드록시 벤즈알데히드 그리고 2,4-디히드록시 벤즈알데히드와의 축합에 의해 합성되었으며 이들 착화합물의 특성을 원소분석, 전도도 측정, 자기화율 측정, UV, IR, NMR 스펙트라와 DTA, TG, DSC 결과를 이용하여 조사하였다. 구조와 열분해 메카니즘이 제안되었다. Complexes of uranyl ion <TEX>$UO^{+2}_2$</TEX>with Schiff-bases obtained by…
The title compound is composed of one-dimensional polymeric [[Er(2)(C(12)O(12))(H(2)O)(10)].4H(2)O](n) chains containing Er in a slightly distorted antiprismatic eightfold coordination. The benzenehexacarboxylate ion is located about an inversion centre. Water molecules of crystallization, linked by hydrogen bonding t…
In this paper, the kinetics and morphology of viscoelastic microphase separation of diblock copolymers are investigated in detail. It is found that for a symmetric system ( f = 0.5), taking into account the bulk modulus differences between the two blocks, the classical randomly oriented lamellar morphology is not obse…
To find the origin of the diffusion channels observed in sodium silicate glasses, we have performed classical molecular dynamics simulations of Na 2 O–4SiO 2 during which the mass of the Si and O atoms has been multiplied by a tuning coefficient. We observe that the channels disappear and that the diffusive motion of…
We performed partial oxidation, steam reforming, and CO 2 reforming of CH 4 to synthesis gas, using oxidized-diamond-supported group VIII metal catalysts, to investigate the properties of oxidized diamond as a support material and to avoid carbon deposition on a metal-loaded catalyst. Nickel (5 wt %)/oxidized diamond…
Neutron scattering has been used to study static and dynamic magnetic properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ with $x=0.09$ and $0.125.$ The $x=0.09$ compound appears as a limit case of an inhomogeneous canted antiferromagnetic (CAF) A-type structure. Related to the mean AF…