Materials Literature
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The paramagnetic and chiral anion [Fe(C5O5)3]3- (C5O52-=croconate) has been combined with the organic donor BEDT-TTF (=ET=bis(ethylenedithio)tetrathiafulvalene) to synthesize a novel paramagnetic semiconductor with the first chirality-induced alpha phase, alpha-(BEDT-TTF)5[Fe(C5O5)3].5H2O (1), and one of the few known…
Thin films of poly(chloro-p-xylylene) (PPXC) grown by the pyrolysis and evaporation of chloro-[2.2]paracyclophane in an evacuated chamber contain free-standing, slanted, parallel columns that are 50 mum long and are assemblies of 50- to 100-nm-diameter nanowires, which thus can have an unprecedented aspect ratio as hi…
Block copolymer lithography is a promising method for fabricating periodical nanopatterns of less than 20 nm by self-assembly and can be applicable for fabricating patterned magnetic media with a recording density over 1 Tb/in.2. We found a simple technique to control the orientation of cylindrical microdomains in thi…
An unstable organic free radical 2pyNO (tert-butyl 2-pyridyl nitroxide) was trapped with transition-metal ions, giving stable metal−radical compounds. Complex [NiII(2pyNO)2(H2O)2]·(ClO4)2 showed intramolecular strong ferromagnetic coupling (J/kB = +126(3) K), while [CuII(2pyNO)2(ClO4)2] showed antiferromagnetic coupli…
A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba 7 Y 2 Mn 3 Ti 2 O 20 was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO 2 and BaO 3 layers. In the oxygen-stoichiometric material, the vacanci…
A population balance model based on Smoluchowski aggregation kinetics is developed to explain the formation of nanorods from a colloidal suspension of spherical nanoparticles (nanodots). Our model shows that linear pearl-chain aggregates form by the oriented attachment (OA) of nanodots during the early stages of synth…
Under acid-free conditions using tetraethyl orthosilicate (TEOS) as the silica source and triblock copolymer P123 as the template, mesoporous silica materials of either ultra-large mesoporous cellular foam (MCF) or two-dimensional (2D)-hexagonal p 6 mm pore arrangement were synthesized with the aid of salt and alcohol…
Using field-theoretic simulations, we study a symmetric diblock copolymer melt confined between two parallel neutral walls separated by a distance L . We consider two scenarios: a mean-field regime and a fluctuating case corresponding to a polymerization index N ∼ 10 5 . For both cases, we analyze the behavior of this…
We report here a direct surface-grafting approach to forming DNA-containing polymer shells outside of Au nanoparticles using aqueous atom transfer radical polymerization (ATRP). In this approach, DNA molecules were immobilized on Au particles to introduce ATRP initiators on the surface. The same DNA molecules also act…
Abstract Thin film of a spin crossover complex [Fe(dpp)2](BF4)2 (dpp = 2,6-di(pyrazollyl)pyridine) has been fabricated by a spin-coating method. The obtained film exhibits spin transition at around 260 K. The absorption spectra and the electrical resistance change with the spin transition. These phenomena are reproduc…
We describe a fast, reproducible method to accurately measure the length of single-walled carbon nanotubes (SWNTs). The method is based on measuring the viscosity of a macroscopic sample of dilute suspended SWNTs. The average length is determined from the difference between the zero-shear viscosity of the suspension a…
In this paper, we describe the efficient and selective synthesis of aryldipyrromethanes in aqueous medium by acid-catalyzed (HCl) condensations of aromatic aldehydes with 3 equivalents of pyrrole at room temperature. The precipitated aryldipyrromethanes can be isolated directly from the reaction mixture in an essentia…
A complete, continuous transition from discrete macroions to blackberry structures, and then back to discrete macroions, is reported for the first time in the system of {Mo132}/water/acetone, with {Mo132} (full formula (NH4)42[Mo132O372(CH3COO)30(H2O)72].ca.300H2O.ca.10CH3COONH4) as the C60-like anionic polyoxomolybda…
The infrared OH stretching frequencies of the various types of hydroxyl groups on MgO surfaces have been calculated by periodic (VASP) and cluster (Gaussian) DFT simulations. Surface irregularities (mono and diatomic steps, corners, step divacancies, and kinks) have been considered to model the IR spectra of hydroxyla…
Semiconductor ZnO nanotube arrays have been synthesized by direct electrochemical deposition from aqueous solutions into porous anodic alumina membranes. Scanning electron microscopy and transmission electron microscopy indicate that large-area and highly ordered nanotube arrays have been obtained. X-ray diffraction a…
The adsorption characteristics of three proteins [bovine serum albumin (BSA), myoglobin (Mb), and cytochrome c (CytC)] onto self-assembled monolayers of mercaptoundecanoic acid (MUA) on both gold nanoparticles (AuNP) and gold surfaces (Au) are described. The combination of quartz crystal microbalance measurements with…
The vitamin B(6)-derived pyridoxal 5'-phosphate (PLP) is the cofactor of enzymes catalyzing a large variety of chemical reactions mainly involved in amino acid metabolism. These enzymes have been divided in five families and fold types on the basis of evolutionary relationships and protein structural organization. Alm…
Submicrometer-scale periodic structures consisting of parallel grooves were prepared on azobenzene-containing multiarm star polymer films by laser interference. The wetting characteristics on the patterned surfaces were studied by contact angle measurements. Macroscopic distortion of water drops was found on such smal…
A computer simulation technique, suited to replicate real adsorption experiments, was applied to pure simulated silica in order to gain insight into the fractal regime of its surface. The previously reported experimental fractal dimension was closely approached and the hitherto uncharted lower limit of fractal surface…
The relationship between surface tension and roughness is reviewed. The Cassie-Baxter model is restated in its original form, which better describes the most general cases of surface roughness. Using mechanical and chemical surface modification of nylon 6,6 woven fabric, an artificial superhydrophobic surface was prep…