Materials Literature
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Site-specific spectroscopy is critical for a molecular-level understanding of the mechanisms and dynamics of the inhomogeneous chemical processes crucial for catalysis, surface and interfacial chemistry, and membrane protein dynamics in living cells. Surface-enhanced Raman scattering (SERS) spectroscopy and microscopy…
The rigid-rod polymer poly(1,5-naphthalenebenzobisthiazole) (Naph-1,5-PBT) was synthesized and spun into fibers from the lyotropic mesophase of the polymer in polyphosphoric acid by a dry-jet wet spinning method. The crystal structure of naph-1,5-PBT fibers was investigated using X-ray diffraction and molecular modeli…
The luminescent properties of Gd 2 SiO 5 powder crystals doped with Eu 3+ were investigated using synchrotron radiation and a VUV laser (157.6 nm) as excitation sources. The excitation spectra in the range of 160–330 nm monitoring the red emission from Eu 3+ ions reveal bands corresponding to intraconfigurational 4f–4…
A novel electrochemical process, based on simultaneous underpotential deposition of Pb and S from the same solution containing EDTA, Pb2+, and S2- at a constant potential, is reported. AFM and XRD results indicate that highly crystalline thin films of PbS could be synthesized by this method.
Lipophilic hexaporphyrin free-base and copper-metalated assemblies supported on a Sn6O6 core have been synthesized and characterized. The nuclease activity of the copper derivative has been studied.
Asymmetric telechelic α-hydroxyl-ω-(carboxylic acid) poly(ε-caprolactone) (HA-PCL) and α-hydroxyl-ω-(carboxylic acid) poly(δ-valerolactone) (HA-PVL) were synthesized by ring-opening polymerization of ε-caprolactone (CL) and δ-valerolactone (VL), respectively. HA-PCL oligomers were obtained at 150 °C in 2 h using ammon…
Electrically addressable biomolecular functionalization of diamond thin films is achieved by growing a conductive diamond thin film on molybdenum electrodes, functionalizing to produce surface nitro groups, and electrochemically reducing the nitro groups on specific diamond-coated electrodes to primary amines. The ami…
Polar optical-phonon modes are derived analytically for spheroidal quantum dots with wurtzite crystal structure. The developed theory is applied to freestanding spheroidal ZnO quantum dots and to spheroidal ZnO quantum dots embedded into a MgZnO crystal. The wurtzite (anisotropic) quantum dots are shown to have strong…
We propose a new method for carrying out field-theoretic simulations of polymer systems under conditions of prescribed external stress, allowing for shape changes in the simulation box. A compact expression for the deviatoric stress tensor is derived in terms of the chain propagator, and it is used to monitor changes…
We present a general study of oscillations in suspended one-dimensional elastic systems clamped at each end, exploring a wide range of slack (excess length) and downward external forces. Our results apply directly to recent experiments in nanotube and silicon nanowire oscillators. We find the behavior to simplify in t…
We report measurements on fluid–fluid phase separation in a colloid–polymer mixture, which can be followed in great detail due to the ultralow interfacial tension. The use of the real-space technique, laser-scanning confocal microscopy, leads to clear, well-defined images making quantitative comparisons to theory poss…
Oxidative doping of extended pi-conjugated polymers and oligomers produces dramatic changes in optical and electrical properties, arising from polaron and soliton-derived midgap states. Despite the great importance of such changes for materials properties, far less is known about the cationic polaron states than about…
Efficient refolding of proteins and prevention of their aggregation during folding are of vital importance in recombinant protein production and in finding cures for several diseases. We have used citrate synthase (CS) as a model to understand the mechanism of aggregation during refolding and its prevention using seve…
A review is given of various first-principles studies of the dielectric properties of crystalline and amorphous transition metal oxides and silicates, which have drawn considerable attention as potential high-κ materials. After a brief summary of the principal equations of density-functional theory related to the diel…
The nitroxide-mediated polymerization of styrenic monomers containing oligo(ethylene glycol) (OEGn) moieties was chosen for the preparation of biocompatible polymer brushes tethered to silicon oxide surfaces due to the broad range of monomer structures available and the use of a nonmetallic initiator. These surfaces w…
Pure monoclinic (m-) and tetragonal phased (t-) LaVO(4) nanocrystals could be obtained by a hydrothermal method in a controllable way with additives. It is found that chelating ligands, such as ethylenediaminetetraacetic acid [EDTA or H(4)L, where L(4-) = (CH(2)COO)(2)N(CH(2))(2)N(CH(2)COO)(2)(4-)], favor the formatio…
The use of gold nanoparticles as biological probes requires the improvement of colloidal stability. Dihydrolipoic acid (DHLA), a dithiol obtained by the reduction of thioctic acid, appears therefore very attractive for the stabilization and the further functionalization of gold nanoparticles because DHLA is characteri…
Thin p-type Sb-doped ZnO films were grown by filtered vacuum arc deposition (FVAD), on untreated glass samples. The arc cathode was prepared by dissolving Sb into molten Zn. The deposition was performed with 200 A arc current, running for 120-240 s in 0.426 Pa oxygen pressure. The film thickness was 330-500 nm. The ao…
Novel columnar liquid crystalline compounds N,N'-bis(3,4,5-trialkoxylphenyl)ureas 1a-c (R = n-C(8)H(17), n-C(12)H(25), and n-C(16)H(33)) were synthesized, and their phase transitions were measured by differential scanning calorimetery. The superstructures were investigated by X-ray diffraction, polarized light optical…
Nanotube arrays of amorphous vanadium pentoxide (V(2)O(5)) were synthesized via template-based electrodeposition, and its electrochemical properties were investigated for Li-ion intercalation applications. The nanotubes have a length of 10 microm, outer diameter of 200 nm and inner diameter of 100 nm. Electrochemical…