Materials Literature
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The ionization of liquefied noble gases by radiation is known to be accompanied by fluctuations much larger than predicted by Poisson statistics. We have studied the fluctuations of both scintillation and ionization in liquid xenon and have measured, for the first time, a strong anti-correlation between the two at a m…
A dipole interaction model (IM) for calculating the molecular second hyperpolarizability, γ, of aliphatic and aromatic molecules has been investigated. The model has been parametrized from quantum chemical calculations of γ at the self-consistent field (SCF) level of theory for 72 molecules. The model consists of thre…
The reaction of the dinuclear species (mu-NH,NH)[Fe(III)(L(IP))(L(AP))](2) dissolved in CH(2)Cl(2) with dioxygen affords black microcrystals of diamagnetic (mu-S,S)[Fe(III)(L(IP))(L(ISQ))](2).n-hexane (6) upon the addition of n-hexane, where (L(IP))(2)(-) represents the dianion of 4,6-di-tert-butyl-2-aminothiophenol,…
CdSe/CdS nanocrystals are studied by electrostatic force microscopy (EFM) on n- and p-type silicon with 2-nm surface oxide and graphite for comparison. In the absence of above-band-gap excitation, the nanocrystals are not in electrical equilibrium with the substrates. Upon continuous photoexcitation, the particles beh…
The hydrothermal reaction of salts of manganese, rare-earth metals, and alkali-earth metals in the presence of potassium hydroxide yields highly crystalline samples of mixed-metal manganites, Ln1-xAxMnO3, at temperatures as low as 240 °C.
Using a time-dependent extension of a density-functional tight-binding method, we have calculated the excitation spectra of stoichiometric cadmium sulfide clusters up to 144 atoms. The spectra show a strong dependency of the lowest unoccupied molecular orbitals on the structural properties of the clusters, especially…
Current−voltage measurements of various carbon nanotube−polymer composite films at room temperature as well as at liquid nitrogen temperature reveal that the composite films consisting of defective carbon nanotubes exhibit higher conductivity than do graphite carbon nanotubes. This novel finding contradicts previous r…
The relation between differential geometry of surfaces and some Heisenberg ferromagnet models is considered.
A general synthetic route has been developed for the simple and efficient preparation of N-functionalized dithieno[3,2-b:2',3'-d]pyrroles. These synthetic methods utilize N-functionalized N-(3'-thienyl)-3-aminothiophenes produced from the Pd-catalyzed amination of 3-bromothiophene with primary amines, followed by a on…
Measurements of ion transport and water flux across ultrathin multilayered membranes of polyelectrolytes were carried out under nanofiltration and reverse osmosis conditions. The polyelectrolyte membranes were prepared upon alternating electrostatic layer-by-layer adsorption of polyvinylamine (PVA) and polyvinyl sulfa…
This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly( N -isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N -isopropylacrylamide was initiated from th…
Effective drug delivery requires the precise spatial and temporal delivery of therapeutic agents to the target site. To this end, a variety of chemical and physicochemical approaches have been devised to create lipid vesicles (liposomes) that can be triggered to release their contents in a controlled fashion. The trig…
A series of ten 2,3,4,5-tetraphenylsiloles with different 1,1-substituents [XYSi(CPh) 4 ] were prepared, and three of these, i.e., 1,1,2,3,4,5-hexaphenylsilole [X = Y = Ph ( 3 )], 1-ethynyl-1,2,3,4,5-pentaphenylsilole [X = Ph, Y = C⋮CH ( 15 )], and 1,1-bis(phenylethynyl)-2,3,4,5-tetraphenylsilole [X = Y = C⋮CPh ( 18 )…
Estimations of thermal hazards based on calorimetric experiments can be resource consuming. Therefore, reactive hazard predictions using computational techniques are an attractive option. Typically, prior to detailed experimentation, a screening test is performed on the set of potential reactive chemicals using a diff…
In order to reduce the compliance mismatch between the native artery and the artificial graft, we have developed a coaxial double-tubular compliant graft, using multiply micropored segmented polyurethane (SPU) thin films, which mimics the relationship between the intraluminal pressure and vessel internal diameter (P-D…
The scope of this paper is the theoretical study of hydrogen atom interaction with the boron-doped graphite surface taken as a model for the interactions that occur in controlled thermonuclear fusion devices. This work is carried out in the framework of the density functional theory. The boron-doped graphite surfaces…
The electronic structure of Pb(II) porphyrin (PbP) has been studied by performing ab initio calculations based on a density functional theory. The calculated optimum structure of PbP reasonably agrees with that determined by the X-ray structure analysis. The analysis of the Kohn−Sham orbitals of PbP has revealed that…
This paper presents an analysis of the structural changes undergone by liquid ${\mathrm{Ge}}_{15}{\mathrm{Te}}_{85}$ alloys in a 150 K temperature range above the eutectic temperature. This structural change is characterized by strong and anomalous variations of thermodynamic quantities among which are the density, th…
A low-temperature (350 °C) ion-exchange reaction was used to insert Fe−Cl layers between the perovskite blocks of a double-layered Dion−Jacobson compound. The product, (FeCl)LaNb 2 O 7, contains iron coordinated by two apical oxygens from the perovskite layer and four in-plane chlorines within the interlayer space. Ri…
The heat of reaction has been measured for vapor deposition of metal atoms onto clean polymeric substrates. These calorimetric measurements introduce a new technique for the study of metal-polymer interfacial chemistry. Results for three systems are reported here, calcium, chromium, and copper on PMDA-ODA polyimide, a…