Materials Literature
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Fabrication processes for wet chemical and dry etching of hollow capillary leaky optical waveguides in high-purity fused silica for extended path cells for improved optical detection in analytical chemistry are described. We focus on microstructures with etch depths on the order of 80 μm. Special attention is paid…
A 2D array of ordered dodecanethiol-capped silver nanocrystals of average diameter of 6.5 nm is manufactured by controlled evaporation of the chloroform solvent. Additional particle ordering is obtained in a high magnetic field of 10 T because of the combined action of the attractive capillary force, enhanced by the v…
The denaturant-induced unfolding kinetics of the 89-residue protein, barstar, have been examined using fluorescence resonance energy transfer (FRET) at 25 degrees C and pH 8.0. The core tryptophan, Trp53, in barstar serves as a fluorescence donor, and a thionitrobenzoic acid moiety (TNB) attached to a cysteine residue…
The synthesis of individual carbon nanotubes (CNTs) with controlled diameters at lithographically predefined locations has been achieved. Employing conventional catalyst-mediated chemical vapor deposition (CVD), isolated CNTs were grown out of nanoholes in silicon dioxide created by optical lithography. This allows th…
Sodium tetracalcium pentaniobium heptadecaoxide, NaCa(4)Nb(5)O(17), corresponds to the n = 5 term of the homologous A(n)B(n)O(3n+2) family of structures composed of ABX(3) perovskite layers. The structure consists of perovskite-type blocks of n = 5 layers of NbO(6) octahedra, separated by an interblock region. Success…
The synthesis, characterization, and mesomorphic properties of copper(II) and vanadyl(IV) complexes derived from mono-, di-, or tridecyloxy-4-benzoyloxysalicylidene-3,3‘-diaminobenzidine are reported. These bimetallic complexes and the respective ligands exhibit columnar hexagonal mesomorphism when they possess 8 or 1…
Co−KNO 3 −ZrO 2 and Co−ZrO 2 were prepared. The concentration effect of potassium nitrate on the activity was studied for the oxidation reaction of soot. Catalysts were characterized using the techniques BET, XRD, DSC, TPR, and SEM and the catalytic activity was measured in a microbalance. An important decrease of the…
Poly( N,N ‘-dihexyl-2,2‘-biimidazole-5,5‘-diyl), PBIm(NHex), poly( N,N ‘-dimethoxymethyl-2,2‘-biimidazole-5,5‘-diyl), PBIm(NMOM), and poly( N -methylimidazole), PIm(NMe), were prepared by dehalogenative polycondensation using a zerovalent nickel complex. PBIm(NHex), PBIm(NMOM), and PIm(NMe) showed number-average molec…
A new 2-(9-anthrylmethylamino)ethyl-appended cyclen, L(3) (1-(2-(9-anthrylmethylamino)ethyl)-1,4,7,10-tetraazacyclododecane) (cyclen = 1,4,7,10-tetraazacyclododecane), was synthesized and characterized for a new Zn(2+) chelation-enhanced fluorophore, in comparison with previously reported 9-anthrylmethylcyclen L(1) (1…
We studied the thermodynamic properties of a large ensemble of polymer crystals confined in the spherical cells of a block copolymer mesostructure. Nucleated only at large supercoolings, the resulting highly imperfect crystallites showed significant reorganization upon heating. A broad melting range is caused by the s…
Dynamic light scattering (DLS) measurements were performed on aqueous solutions of native silk fibroin extracted from three parts, the posterior (MP), the middle (MM), and the anterior parts (MA), of the middle division (M) of the silk gland of the Bombyx mori silkworm to study the dynamics and aggregation properties…
One of the prototype compounds for metal-metal multiple bonding, the Re(2)Cl(8)(2)(-) ion, has been studied theoretically using multiconfigurational quantum chemical methods. The molecular structure of the ground state has been determined. It is shown that the effective bond order of the Re-Re bond is close to three,…
Several unique crystalline zinc borates are known, a few of which find industrial use in significant tonnages. Although the most important of these has been a commercial product for more than 3 decades, it was never before structurally characterized. The structure of Zn[B 3 O 4 (OH) 3 ] ( 1 ) was determined for the fi…
We discuss the properties of superconducting derivatives of the RuSr2GdCu2O8 (1212-type) ruthenocuprate, for which heterovalent doping has been achieved through partial substitution of Cu ions into the RuO2 planes (Ru1-xSr2GdCu2+xO8-d, 0Ru doping achieved in these phases is found to decrease the temperature for magnet…
The synthesis of SrRuO3 under high-pressure oxygen produces a nonstoichiometric form with randomly distributed vacancies on the Ru-sites, along with a significantly reduced ferromagnetic ordering temperature. In order to gain additional insight into the suppression of the ferromagnetism, local studies utilizing 99,101…
The crystallization behavior of poly(ethylene oxide) (PEO) was studied in the presence of an inorganic filler surface (sodium montmorillonite) with DSC, as well as isothermal cross-polarization optical microscopy. Crystallization of PEO is found to be inhibited, exhibiting a decrease of spherulite growth rate and crys…
A simple and effective means for obtaining hollow silica particles of controlled diameter from about 60 to 120 nm is presented. The synthesis utilizes equilibrium vesicles as templates for the directed growth of silica. Two different surfactant systems are used to form the vesicular templates: (a) mixtures of cetyltri…
Several ligands, such as alkylthiols, -amines, -silanes, -phosphines, -halides, and simple alkanes, were employed for digestive ripening, a process in which a colloidal suspension in a solvent is refluxed at the solvent boiling temperature in the presence of a surface-active ligand to convert a highly polydisperse col…
Carbon nanotubes have properties potentially useful in diverse electrical and mechanical nanoscale devices and for making strong, light materials. However, carbon nanotubes are difficult to solubilize and organize into architectures necessary for many applications. In the present paper, we describe an amphiphilic alph…
Abstract Blends of conductive polymers with conventional nonconductive ones have, together, the virtues of good electroconductivity and good mechanical properties, whose prospect for electronic industrial application is very good. We prepared poly(vinyl alcohol) (PVA)–sodium polystyrene–sulfonate (PSSNa) blends throug…