Materials Literature
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The crystal orientation and piezoelectric properties of solution grown ZnO nanorods on Ag films were measured by quantitative piezoelectric force microscopy (PFM). The polarity of the rods, important for many device applications, was determined to be oriented [0001] from the substrates. This indicates that the prevale…
Neural progenitor cells (NPCs) have shown promise in a number of models of disease and injury, but for these cells to be safe and effective, they must be directed to differentiate appropriately following transplantation. We have developed a photopolymerized hydrogel composed of macromers of poly(ethylene glycol) (PEG)…
In this work, gold nanoparticles with an appreciably narrow size distribution are prepared by reduction of HAuCl4 in the presence of mono-6-SH-β-cyclodextrins (CDs). The β-CD modified gold nanoparticles (β-CD-AuNPs) tend to aggregate together upon addition of diazo, water soluble ditopic guest molecules with a double-…
In this work, we report the optical properties of Tm(3+) ions in tellurite glasses (TeO(2)-TiO(2)-Nb(2)O(5)) for different Tm(3+) concentrations ranging between 0.05 and 1 wt%. Judd-Ofelt intensity parameters have been determined to calculate the radiative transition probabilities and radiative lifetimes of excited st…
The antitumor activity of a novel thiolytically cleavable lipid-based prodrug of mitomycin C (MMC) delivered by STEALTH liposomes (SL) was studied in drug resistant human ovarian carcinoma A2780/AD model and compared with free MMC and both free and SL forms of an established anticancer drug--doxorubicin (DOX). It was…
A possible mechanism for shock-induced failure in aluminium involves atomic vacancies diffusing through the crystal lattice and agglomerating to form voids, which continue to grow, ultimately resulting in ductile fracture. We employ orbital-free density functional theory, a linear-scaling first-principles quantum mech…
A new cyclodextrin-based carrier for active targeting of low soluble and degradable drugs has been synthesized and characterized. Beta-cyclodextrins were first reacted with excess hexamethylene diisocyanate and the resulting CD-(C6-NCO)5 derivative was reacted with 700 Da diamino-PEG to yield CD-(C6-PEG-NH2)5. About o…
Mesoporous zirconia with different pore sizes have been prepared and investigated as supports of cobalt catalysts for Fischer–Tropsch synthesis (FTS). It was found that the F–T catalytic performances were closely correlated to the pore sizes of the mesoporous zirconia. The average crystalline sizes of Co3O4 grew with…
Methods which solubilize single-walled carbon nanotubes (SWNTs) in water as individuals, not bundles, while retaining their unique electronic, photonic and mechanical properties are highly desirable. Furthermore, functionalization with a diverse array of selectable chemical moieties would allow the range of useful app…
Using metallic nanoislands, we demonstrate the localized plasmonic control and modification of the spontaneous emission from closely-packed nanocrystal emitters, leading to significant changes in their collective emission characteristics tuned spectrally and spatially by plasmon coupling. Using randomly-distributed si…
EXAFS data modeling of nanoparticles can be done at a very high level of detail if regular polyhedral geometries are considered as possible structural models. Such geometries can be characterized by unique sequence of indices (coordination numbers) of the first few coordination shells that serve as a signature of a sh…
We present a novel approach to enhance light emission in Si and demonstrate a sub-bandgap light emitting diode based on the introduction of point defects that enhance the radiative recombination rate. Ion implantation, pulsed laser melting and rapid thermal annealing were used to create a diode containing a self-inter…
K-10 montmorillonite, commonly used as a heterogeneous acid catalyst, was found to vary in the extent of acid-treatment, with some batches exhibiting significantly reduced catalytic activity in Brønsted acid-catalysed reactions. K-10 was thus further treated with HCl of varying concentrations to increase its activity…
Water-soluble triple-stranded [Ln(2)(L)(3)] helicates have been successfully tested as imaging probes in human cervical adenocarcinoma cells (HeLa), the complex being not toxic and clearly staining their cytoplasm in a concentration-dependent manner.
Two-dimensional (2D) gratings made up of an array of differently twisted nematic structures are obtained by crossed assembling of 1D polarization holograms recorded at the photoaligning substrates. The rotating linear polarization pattern, produced by the interference of two opposite circularly polarized beams, is rec…
New fluorinated polyhedral oligomeric silsesquioxane (F-POSS) structures possessing a high degree of hydrophobicity have been prepared via a facile corner-capping methodology.
A series of novel organic–inorganic nanohybrid materials were obtained by the intercalation in the interlamellar spaces of the clay mineral kaolinite, of ionic liquids based on imidazolium derivatives. The intercalation procedure was successfully accomplished via a melt reaction strategy using the dimethylsulfoxide–ka…
A new microscope has been developed that uses a beam of helium ions which is focused and scanned across the sample. In principle, and in its applications, it is similar to a traditional scanning electron microscope (SEM). However, the source technology, the sample interaction, and the contrast mechanisms are distinctl…
The interactions of biomolecules with atomic features on crystal surfaces lead to dramatic changes in morphology and growth rate. Molecular scale studies based on atomic force microscopy and computational modeling have provided new insights into the mechanisms that lead to these changes. We examine the key factors tha…
Homo- and hetero-leptic Zn and Cu complexes of dipyrrin type ligands bearing mono- and di-cyanophenyl groups when combined with silver cations lead to the formation of Ag(I)-C=C double bond interactions unprecedented in the crystalline phase.