Materials Literature
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Abstract Tetranuclear lanthanide clusters of composition [Ln 4 ( μ 3 ‐OH) 2 (Ph 2 acac) 10 ] (Ln = Pr, Nd, and Sm) (Ph 2 acac = dibenzoylmethanide) were prepared starting from [LnCl 3 ·(n H 2 O)] (n = 6, 7) with 2.5 equivalents dibenzoylmethane in presence of triethylamine. Single crystals X‐ray analyses of compounds…
Abstract For a series of mixed-layer illite-smectite (I-S) minerals from a drillhole near the Kakkonda geothermal field, one-dimensional structure analysis by X-ray diffraction (XRD) was performed using Casaturated specimens in both air-dried and ethylene glycol-solvated states. The expandability characteristics of co…
Pyrochlore-type (A 2 B 2 O 6 O’) ceramics are considered for the immobilization of highly radioactive waste. Understanding the alteration process of such potential nuclear waste form materials in aqueous media is critical for the prediction of their long-term stability in a nuclear repository. Current models on pyroch…
A molecular modeling approach is used to study the stability of different polymorphic forms of l-glutamic acid through building and optimizing molecular clusters of different sizes and shapes with the latter corresponding to the predicted crystal growth morphologies. The results reveal that the initially nucleating (a…
Western blot analysis is a widely used technique for protein immunodetection. Its current format, however is unsuitable for multiplex detection of proteins, primarily due to intrinsic limitations of standard organic dyes employed as probes. Quantum dot (QD) semiconductor nanoparticles exhibit significant advantages ov…
The introduction of combination chemotherapeutic regimens for the treatment of childhood leukaemia in the 1960s provided the proof-of-principle that cytotoxic drugs were capable of curing cancer. However, in the four decades since this discovery, the majority of cancers still cannot be cured by chemotherapy. Clinical…
Alternating polyelectrolyte “layer-by-layer” deposition has been used to create emissive thin films of a weakly anionic, nonaggregating poly(phenylene ethynylene) on silica microspheres. The resulting particles are smooth and emit fluorescence solely from the outside polymer-coated surface. Suspensions of the coated m…
The effect of varying the applied acoustic power on the extent to which the addition of water-soluble solutes affect the intensity of aqueous multibubble sonoluminescence (MBSL) has been investigated. Under most of the experimental conditions used, the addition of aliphatic alcohols to aqueous solutions was found to s…
Film deposition in pulsed inductively coupled plasmas is investigated using methane as precursor gas. The densities of neutrals as well as ion and radical fluxes are quantified using mass spectrometry. Plasma composition is uniquely determined by the mean dissipated energy per source gas molecule in the plasma, Emean.…
The thickness and surface roughness of the native oxide on undoped and P-doped single crystal silicon and polycrystalline silicon (polysilicon) were measured after exposure to aqueous hydrofluoric acid (HF) in the presence of localized metallization of sputtered Au or Pd. Both P-doping and the presence of metallizatio…
Single-walled carbon nanotubes (SWNTs) are dispersed in water via wrapping with short segments of single-stranded DNA (ssDNA). Small angle neutron scattering suggests a power-law exponent that is consistent with clustered nanotubes and hence marginal stability. The SWNT-ssDNA complex is used to stabilize dispersions o…
Germanium dioxide films containing Ge nanocrystals are studied. The films have been prepared by two methods: (i) deposition from supersaturated GeO vapors with subsequent decomposition of metastable germanium monoxide into a heterophase Ge:GeO 2 system, and (ii) formation of anomalously thick native germanium oxides w…
The europium-tetracycline complex [Eu(Tc)] is known to show only weak fluorescence with an emission maximum at 615 nm. On addition of hydrogen peroxide (HP), the strongly fluorescent [Eu(Tc)(HP)] complex is formed, which displays a 15-fold stronger luminescence intensity. This study describes the decrease in luminesce…
The apparent deformation due to an electric field does not rigorously describe the electrostriction phenomenon. This is in part due to uncertainties in the mechanical constraints at the specimen boundaries. Such constraints are very critical in thin films. Determining the electric-field-induced stress seems to be a mo…
We have prepared high-quality assemblies of monodisperse CdSe quantum dots and employed a combination of electrochemical gating and electrical and optical techniques to study orbital occupation in these quantum-dot solids. Electron occupation in localized states is important in some cases and can be unambiguously dist…
Initiated CVD (iCVD), a dry method, is able to produce poly(methyl methacrylate) (PMMA) thin films by utilizing a reactive gaseous mixture of the monomer methyl methacrylate and the initiator triethylamine. The deposition rate is twenty times faster with the use of the initiator. Fourier-transform infrared (FTIR) spec…
Photoactive supramolecules composed of electron donor and electron acceptor entities are important for light energy harvesting applications. In the present study, a Star Wars Tie Fighter Ship shaped supramolecular triad was constructed by self-assembling two zinc naphthalocyanines to a fulleropyrrolidine bearing two p…
The crystal and magnetic structures of La0.75Ca0.25MnO3 manganite are studied under high pressures up to 4.5 GPa in the temperature range 12–300 K by the neutron diffraction method. At normal pressure and temperature T C = 240 K, a ferromagnetic state is formed in La0.75Ca0.25MnO3. At high pressures P ≥ 1.5 GPa and at…
Porous low- k and ultrathin atomic-layer-deposited (ALD)-TaN are expected to be useful materials for Cu interconnects in ULSI devices of the 45-nm technology node and beyond. One problem with integrating these into the Cu interconnect is the Ta penetration which occurs during ALD-TaN deposition. In this work, we propo…
Abstract Nanocrystalline materials are polycrystals made up of nanometer-sized grains separated by a network of interfaces – grain or phase boundaries – that generally make a positive contribution to the total energy of the system. Consequently, there exists a thermodynamic driving force for reducing the overall inter…